Semi-buried self-tunneling airport pavement forcible entry device

Abstract

The invention relates to the technical field of airport pavement maintenance, in particular to a semi-buried self-tunneling airport pavement forcible entry device. The device is characterized by comprising a guide beam, supporting legs, a guide rail, a counter-force frame, a single-piston-rod hydraulic cylinder, a cutter bar assembly and an energy accumulator, the guide beam is a platform for guaranteeing accurate motion trail of a boring cutter and is of a steel box beam structure, the height and the level of the guide beam are adjusted through the supporting legs, and balancing weights with different weights are designed on the guide beam to cope with various working conditions. The guide rail is installed on the guide beam to guarantee the straightness of reciprocating linear motion of the cutter bar assembly, the counter-force frame is provided with a hydraulic cylinder, a piston stretches out to help the counter-force frame to abut against the two sides of a working groove during working, the hydraulic cylinder serves as a clamp to clamp and position set cement, and the cutter bar assembly and the set cement machining surface are guided to be in the correct position. The single-piston-rod hydraulic cylinder pushes the cutter bar assembly to do reciprocating rectilinear motion along the guide rail.

Description

Technical Field

[0001] The invention relates to the technical field of airport pavement maintenance, and in particular to a semi-buried self-excavating airport pavement demolition device. Background Art

[0002] The pavement of airport flight zones in my country is usually made of cement concrete. Common pavement diseases in airport flight zones include sanding, peeling, cracking, sanding, peeling, cracking, apron, etc. Civil airports are required to meet the navigation conditions within 4 hours of suspension, which requires the demolition of the slabs in the diseased area of ​​the airport pavement and the completion of the concrete pouring and hardening construction as scheduled. Military airports require a more urgent time to resume navigation, so the problem of rapid pavement demolition needs to be solved urgently. A Chinese invention patent (patent number CN2024108143153, patent name "A device for milling old roads on municipal roads") discloses a device for milling old roads on municipal roads, characterized in that it includes an excavator body, a traction cover is fixedly installed at the bottom end of the swing arm of the excavator body, a connecting column is fixed at the bottom of the traction cover, a crossbeam is rotatably connected at the bottom of the connecting column, a support seat 1 is fixed at both ends of the crossbeam, a transmission pipe is rotatably connected between the two support seats 1, and a milling wheel is sleeved and fixed on the outer side of the transmission pipe. In the present invention, the swing arm of the excavator moves the milling wheel to the milling position, the depth of the road milling is controlled by the up and down movement of the swing arm, the length of the road milling distance is achieved by the excavator moving the milling wheel in a straight line along the road surface, the motor 1 rotates with the driving cover to make the crossbeam rotate and tilt with the milling wheel, reduce the width of the milling operation of the milling wheel, facilitate the milling wheel to avoid the manhole cover and mill the road surface, and help improve the efficiency of milling. A Chinese invention patent (patent number CN2017207034794, patent name is a road demolition machine) discloses a road demolition machine, characterized in that it includes a push rod, a hydraulic oil pump, a demolition pick, a lifting drill platform, a support plate and a solenoid valve, the push rod is fixed to the left end of the mobile platform, a connecting plate is fixed to the front end of the mobile platform, a demolition pick and a lifting drill platform are installed on the connecting plate, an engine is installed on the right side of the mobile platform, a hydraulic oil pump is arranged on the left side of the engine, the oil distributor is connected to the demolition pick through a demolition oil inlet pipe above the oil distributor, and is connected to the lifting drill platform through a lifting oil inlet pipe below the oil distributor, and solenoid valves are installed on the demolition oil inlet pipe and the lifting oil inlet pipe, the demolition pick body is composed of a hydraulic cylinder A, a hydraulic cylinder B, a support plate and a wedge nail, the wedge nail is arranged between the support plates, and the lifting drill platform is composed of a hydraulic cylinder C, a piston rod B, a motor and a drill bit. The beneficial effects are: the new type is a small mobile platform as a whole, which can meet the needs of most construction sites during construction and is easy to operate and move. The new type uses a drill bit to make preliminary holes on the damaged road, with low noise during construction operations. The drill holes are then hydraulically expanded using wedge nails to cause cracks in the road and separate it from the main body. It has high demolition efficiency, low noise, high stability, and flexible mobile operation. It can be flexibly constructed according to site requirements when in use, saving time and effort and greatly improving construction progress.

[0003] Prior art 1 "A milling device for old municipal roads" is intended to solve the problem of demolishing old municipal roads. Cement concrete is a hard and brittle non-metallic material, also known as cement stone. The milling and planing methods for removing cement stone have the following disadvantages: First, the general cutting process is composed of the main motion with the largest power consumption and the feed motion with the smallest power consumption. The main motions of milling and planing are rotary motion and reciprocating linear motion respectively. How to design a tool that meets two completely different motion trajectories is a difficult problem; second, whether milling or planing is used to remove hard and brittle non-metallic materials such as cement stone, it is a process of extrusion and removal. Extrusion and cutting from the surface of the cement stone to the inside is actually a process of vertical impact drilling. In other words, the milling wheel first First, the surface of the cement stone must be cracked vertically downward by drilling, and the vertical force exerted on the milling wheel needs to be transmitted to the excavator body through the swing arm. Because of the effect of the lever, when the force is amplified to the end of the excavator body, it requires several times the vertical force to balance, and it can only be balanced by increasing the deadweight of the excavator body. Then the movement and steering of the bulky excavator body will become a problem. If the instantaneous impact force is huge, the excavator body will tilt, causing torsion damage to the swing arm and hydraulic system failure; thirdly, milling can be divided into forward milling and reverse milling, which will produce left and right lateral impact forces on the swing arm, and the excavator swing arm is not designed to balance the lateral force. It can also be said that there is no clamp to clamp the cement stone workpiece, which will inevitably cause the tool to jump off and cannot continue construction. Prior art 2 "a road demolition machine" demolishes the road through a hydraulically controlled demolition pick. First, a drill is used to make preliminary holes on the damaged road, and then the wedge is injected and pressed to squeeze and destroy the drilled holes, so that the road surface forms scattered fragments, and then separated and cleaned. According to the "Technical Specifications for Construction of Earthwork and Pavement Base (Pad) Layers in Civil Airport Flight Areas" MH / T 5014-2022 and the "Civil Airport Cement Concrete Pavement Design Specifications" MH / T 5004-2010 stipulates that airport pavements are generally composed of a surface layer and a base layer, and both the surface layer and the base layer are usually designed as ordinary concrete structures. The joints divide the cement concrete pavement surface layer into pieces of pavement panels. The pavement where the disease occurs is generally a local surface layer area. The demolition of the local diseased surface layer area requires the protection of the surrounding intact surface layer area and base layer. The existing technology 2 is applied to the demolition of airport pavements, and its main disadvantages are: first, the extrusion force of the wedge nails on the surrounding concrete pavement is transmitted in an irregular direction. For the local maintenance of the airport pavement, the intact pavement that needs to continue to be used will be damaged; second, the extrusion force of the wedge nails on the surrounding concrete is limited, and the local damage radius is limited, that is, wedge nails with a small spacing and a large density are needed to demolish the surface layer area, and the construction space is very crowded. It is impossible to achieve the airport pavement emergency repair project that meets the flight conditions in a short time. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a semi-buried self-excavating airport pavement demolition device, which is characterized in that the airport pavement can be divided into a taxiway, a runway, and an apron. The joints divide the cement concrete pavement surface layer into pieces of pavement panels. The surface layer is designed to have a thickness of 30 to 80 cm according to the size of the load it bears. Since there is a waterproof and buffering isolation material between the base layer and the surface layer, a pit deep to the base layer is excavated along the periphery of the diseased surface layer area to surround the concrete blocks in the diseased surface layer area, that is, the concrete blocks in the diseased surface layer area are separated from the concrete of the surrounding surface layers and the base layer at the bottom. A hoist is installed on the diseased concrete block, and it is lifted and moved away by an engineering crane, so that concrete can be re-poured to repair the surface layer block.

[0005] Digging a pit is the process of cutting cement stone from the free surface to the designed depth. The cutting process is achieved through the synthesis of multiple simple motion trajectories of the blade. Cement stone is a hard and brittle non-metallic material. Under the extrusion of the blade, the cut cement stone will produce cracks near the blade. The cracks first extend forward, and the depth exceeds the back cutting amount, forming a large thin sheet cutting. This state is called large-scale extrusion. The blade continues to move forward, which is actually cutting off the remaining part after the collapse. At this time, small-scale extrusion occurs. Large-scale extrusion and small-scale extrusion are carried out alternately to achieve fracture damage to the cement stone. Boring is a process in which the tool is installed on the tool bar and penetrates into the inner hole for rotary motion to achieve cutting. The tool bar is designed as a circular tube structure, and the boring tool is installed on the circumferential end face of the tool bar. The tool bar is half buried in the working groove of the road panel. With the axial feed of the tool bar, the semi-cylindrical cement stone core residue is discharged from the hollow tool bar. After the residue is cleaned, the road panel is bored out of a pit with a semicircular cross section.

[0006] The semi-buried self-excavating airport pavement demolition device includes a guide beam, support legs, guide rails, a reaction frame, a single-piston-rod hydraulic cylinder, a tool rod assembly, and an accumulator. The guide beam is a platform that ensures the accurate movement trajectory of the boring tool. It is a steel box beam structure, and the height is adjusted by the support legs. Counterweights of different weights are designed on the guide beam to cope with various working conditions. The guide rails are installed on the guide beam to ensure the straightness of the reciprocating linear motion of the tool rod assembly. The reaction frame is designed with a hydraulic cylinder. When working, the piston extends to help the reaction frame to tighten the two sides of the working groove, and acts as a clamp to achieve clamping and positioning of the cement stone, and guide the tool rod assembly and the cement stone processing surface to be in the correct position. The single-piston-rod hydraulic cylinder pushes the tool rod assembly to reciprocate along the guide rail.

[0007] The tool rod assembly includes a slide rail, a planetary reducer, a horizontal rotating shaft cylinder, a bearing seat, a ring gear, and a boring cutter. The end face of the horizontal rotating shaft cylinder is designed with 8 to 16 pairs of boring cutters along the circumferential direction. The boring cutters are all in the clockwise direction and are opposite to each other in pairs. The vertical components of the clockwise boring cutters are all directed to the ground to partially balance the extrusion force when the cutters cut into the cement stone. The boring cutters are opposite to each other in pairs to balance the radial force between each other. Since the boring cutters work in a fully enclosed manner, the chips cannot be discharged and will block the cutter. Therefore, the boring cutter on the horizontal rotating shaft cylinder is half buried in the pit of the road panel. The chips flowing out from the front of the boring cutter can be cleaned by a vacuum cleaner. Two sets of bearing seats are installed on the horizontal rotating shaft cylinder to ensure the roundness of the boring cutter's motion trajectory. The planetary reducer drives the ring gear installed on the horizontal rotating shaft cylinder to complete the rotational motion.

[0008] The accumulator includes an evaporator and an actuator. The evaporator includes a vapor-liquid separator, a boiler drum, connecting pipes, and a header. The header and the bottom of the boiler drum are filled with saturated liquid ammonia, and the upper part of the boiler drum is filled with saturated ammonia vapor. A free piston is designed in the cylinder of the actuator. The free piston separates the cylinder into two left and right cavities, which are connected to the boiler drum and the header respectively through a connecting pipe. The left cavity is filled with saturated ammonia vapor, and the right cavity is filled with saturated liquid ammonia. The power consumed by the boring tool is very different when cutting cement stones of different properties and when cutting in and out. The principle of phase change conversion of saturated liquid ammonia and saturated ammonia vapor under different pressures in the pressure vessel is used to continuously convert pressure energy and phase change storage energy. When the pressure energy increases, the free piston compresses to the left cavity, and the volume work is converted into phase change storage energy. The saturated ammonia vapor is transformed into saturated liquid ammonia, and the vapor-liquid mixture enters from the left cavity. Boiler drum, saturated liquid ammonia is injected into the right cavity through the connecting row pipe to balance the volume change in the cavity; when the pressure energy decreases, the free piston moves to the right cavity, the phase change energy releases volume work, the saturated liquid ammonia evaporates into saturated ammonia vapor, the gas-liquid mixture enters the header from the right cavity, is injected into the boiler drum through the connecting row pipe, and is sent to the left cavity after separation by the gas-liquid separator to balance the volume change in the cavity. Since the phase change energy storage of saturated liquid ammonia balances the power consumption borne by the boring tool, the curve of the impact work suffered by the boring tool will become much smoother. At the same time, when the frequency of the impact and vibration of the boring tool is the same as the natural frequency of the guide beam, resonance will occur, which will seriously damage the blade. The phase change energy storage in the accumulator can absorb this resonance peak well, and the life of the boring tool will be extended. Since the flat-rotating shaft cylinder is buffered by the accumulator and then connected to the slide rail, it will undoubtedly protect the slide rail and guide rail.

[0009] Compared with the prior art, the present invention has at least the following advantages: First, a semi-buried self-excavating airport pavement demolition device is used to dig a pit deep to the base layer along the periphery of the diseased surface layer area, and the concrete blocks in the diseased surface layer area are separated from the concrete of the surrounding surface layer and the base layer at the bottom. A hoist is installed on the diseased concrete block, and it is lifted and moved away by an engineering crane, and the surface layer block can be re-poured with concrete. The operating area is small, the demolition work volume is small, and the time required for demolition is short, which meets the requirements of the airport pavement emergency repair project that meets the navigation conditions in a short time; second, the boring cement stone excavation process is selected to complete the excavation of the pit, and the working surface that the boring tool needs to process is a semicircular arc, which consumes less power, emits less dust, and emits less noise, which is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The present invention is a schematic diagram of the main structure of a semi-buried self-excavating airport pavement demolition device.

[0011] Figure 2 This is a schematic diagram of the A-scale structure of a semi-buried self-excavating airport pavement demolition device of the present invention.

[0012] Figure 3 This is a schematic diagram of the B-scale structure of a semi-buried self-excavating airport pavement demolition device of the present invention.

[0013] Figure 4 This is a schematic diagram of the C-scale structure of a semi-buried self-excavating airport pavement demolition device of the present invention.

[0014] Figure 5 This is a schematic diagram of the D-scale structure of a semi-buried self-excavating airport pavement demolition device of the present invention.

[0015] 1-Guide beam 2-Support leg 3-Guide rail 4-Reaction frame 5-Single piston rod hydraulic cylinder 6-tool bar assembly 7-accumulator 8-slide rail 9-planetary reducer 10-horizontal rotating shaft 11-Bearing seat 12-Ring gear 13-Boring cutter 14-Evaporator 15-Actuator 16 - Vapor-liquid separator 17 - Boiler drum 18 - Connecting pipe 19 - Header 20 - cylinder body 21 - free piston. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, a semi-buried self-excavating airport pavement demolition device is characterized in that the airport pavement can be divided into taxiways, runways and aprons, and the joints divide the cement concrete pavement surface layer into pieces of pavement panels. The surface layer is designed to have a thickness of 30 to 80 cm according to the size of the load it bears. Since there is a waterproof and buffering isolation material between the base layer and the surface layer, a pit deep to the base layer is excavated along the periphery of the diseased surface layer area to surround the concrete blocks in the diseased surface layer area, that is, the concrete blocks in the diseased surface layer area are separated from the concrete of the surrounding surface layers and the base layer at the bottom, a hoist is installed on the diseased concrete block, and it is lifted and moved away by an engineering crane, so that concrete can be re-poured to repair the surface layer block.

[0018] Digging a pit is the process of cutting cement stone from the free surface to the designed depth. The cutting process is achieved through the synthesis of multiple simple motion trajectories of the blade. Cement stone is a hard and brittle non-metallic material. Under the extrusion of the blade, the cut cement stone will produce cracks near the blade. The cracks first extend forward, and the depth exceeds the back cutting amount, forming a large thin sheet cutting. This state is called large-scale extrusion. The blade continues to move forward, which is actually cutting off the remaining part after the collapse. At this time, small-scale extrusion occurs. Large-scale extrusion and small-scale extrusion are carried out alternately to achieve fracture damage to the cement stone. Boring is a process in which the tool is installed on the tool bar and penetrates into the inner hole for rotary motion to achieve cutting. The tool bar is designed as a circular tube structure, and the boring tool is installed on the circumferential end face of the tool bar. The tool bar is half buried in the working groove of the road panel. With the axial feed of the tool bar, the semi-cylindrical cement stone core residue is discharged from the hollow tool bar. After the residue is cleaned, the road panel is bored out of a pit with a semicircular cross section.

[0019] The semi-buried self-excavating airport pavement demolition device includes a guide beam 1, support legs 2, guide rails 3, reaction frames 4, single-piston-rod hydraulic cylinders 5, a tool rod assembly 6, and an accumulator 7. The guide beam 1 is a platform for ensuring the accurate movement trajectory of the boring tool 13. It is a steel box beam structure. The height is adjusted by the support legs 2. Counterweights of different weights are designed on the guide beam 1 to cope with various working conditions. The guide rails 3 are installed on the guide beam 1 to ensure the straightness of the reciprocating linear motion of the tool rod assembly 6. The reaction frame 4 is designed with a hydraulic cylinder. When working, the piston extends to help the reaction frame 4 to tighten the two sides of the working groove. As a clamp, it realizes the clamping and positioning of the cement stone, and guides the tool rod assembly 6 and the cement stone processing surface to be in the correct position. The single-piston-rod hydraulic cylinder 5 pushes the tool rod assembly 6 to reciprocate along the guide rail 3.

[0020] The tool rod assembly 6 includes a slide rail 8, a planetary reducer 9, a horizontal rotating shaft cylinder 10, a bearing seat 11, a ring gear 12, and a boring cutter 13. The end face of the horizontal rotating shaft cylinder 10 is designed with 8 to 16 pairs of boring cutters 13 along the circumferential direction. The boring cutters 13 are all in the clockwise direction and are opposite to each other in pairs. The vertical components of the clockwise boring cutters 13 are all directed to the ground to partially balance the extrusion force when the tool cuts into the cement stone. The boring cutters 13 are opposite to each other in pairs to balance the radial forces between each other. Since the boring cutters 13 are fully enclosed, the chips cannot be discharged and will block the tool. Therefore, the boring cutters 13 on the horizontal rotating shaft cylinder 10 are half buried in the pit of the road panel. The chips flowing out from the front of the boring cutter 13 can be cleaned by a vacuum cleaner. The horizontal rotating shaft cylinder 10 is installed with two sets of bearing seats 11 to ensure the roundness of the motion trajectory of the boring cutter 13. The planetary reducer 9 drives the ring gear 12 installed on the horizontal rotating shaft cylinder 10 to complete the rotational motion.

[0021] The accumulator 7 includes an evaporator 14 and an actuator 15. The evaporator 14 includes a vapor-liquid separator 16, a boiler drum 17, a connecting row pipe 18, and a header 19. The header 19 and the bottom of the boiler drum 17 are filled with saturated liquid ammonia, and the upper part of the boiler drum 17 is filled with saturated ammonia vapor. A free piston 21 is designed in the cylinder 20 of the actuator 15. The free piston 21 separates the cylinder 20 into two left and right cavities, which are respectively connected to the boiler drum 17 and the header 19 through a pipe. The left cavity is filled with saturated ammonia vapor, and the right cavity is filled with saturated liquid ammonia. The power consumed by the boring tool 13 when cutting cement stones of different properties of soft and hardness and when cutting in and out is very different. The principle of phase change conversion of saturated liquid ammonia and saturated ammonia vapor under different pressures in the pressure vessel is used to continuously convert pressure energy and phase change storage energy. When the pressure energy increases, the free piston 21 compresses toward the left cavity, and the volume work is converted into phase change storage energy. The saturated ammonia vapor is phase-changed into saturated liquid ammonia, and the vapor-liquid mixture is converted from The left chamber enters the boiler drum 17, and the saturated liquid ammonia is injected into the right chamber through the connecting row pipe 18 to balance the volume change in the chamber; when the pressure energy decreases, the free piston 21 moves to the right chamber, the phase change energy releases volume work, the saturated liquid ammonia evaporates into saturated ammonia vapor, and the vapor-liquid mixture enters the header 19 from the right chamber, is injected into the boiler drum 17 through the connecting row pipe 18, and is sent to the left chamber after separation by the vapor-liquid separator 16 to balance the volume change in the chamber. Since the phase change energy storage of the saturated liquid ammonia balances the power consumption borne by the boring tool 13, the curve of the impact work suffered by the boring tool 13 will become much smoother. At the same time, when the frequency of the impact and vibration of the boring tool 13 is the same as the natural frequency of the guide beam 1, resonance will occur, which will seriously damage the blade. The phase change energy storage in the accumulator 7 can absorb this resonance peak well, and the life of the boring tool 13 will be extended. Since the flat-rotating shaft cylinder 10 is connected to the slide rail 8 after being buffered by the accumulator 7, it will undoubtedly protect the slide rail 8 and the guide rail 3.

Claims

1. A semi-buried self-excavating airport pavement demolition device, characterized by: It includes a guide beam, a support leg, a guide rail, a reaction frame, a single-piston-rod hydraulic cylinder, a tool rod assembly, and an accumulator. The guide beam is a platform that ensures the accurate movement trajectory of the boring tool. It is a steel box beam structure. The height is adjusted by the support legs. Counterweights of different weights are designed on the guide beam to cope with various working conditions. The guide rail is installed on the guide beam to ensure the straightness of the reciprocating linear motion of the tool rod assembly. The single-piston-rod hydraulic cylinder drives the tool rod assembly to reciprocate along the guide rail; the tool rod assembly includes a slide rail, a planetary reducer, a horizontal rotating shaft cylinder, a bearing seat, a ring gear, and a boring tool. The end face of the horizontal rotating shaft cylinder is designed with 8 to 16 pairs of boring tools along the circumferential direction. The horizontal rotating shaft cylinder is installed with two sets of bearing seats to ensure the roundness of the movement trajectory of the boring tool. The planetary reducer drives the ring gear installed on the horizontal rotating shaft cylinder to complete the rotary motion; the accumulator includes an evaporator and an actuator. The evaporator includes a vapor-liquid separator, a boiler drum, and a connection. The row pipes and headers are filled with saturated liquid ammonia in the header and the bottom of the boiler drum, and the upper part of the boiler drum is filled with saturated ammonia vapor. A free piston is designed in the cylinder body of the actuator. The free piston separates the cylinder body into two left and right cavities, which are connected to the boiler drum and the header through the connecting pipes respectively. The left cavity is filled with saturated ammonia vapor, and the right cavity is filled with saturated liquid ammonia. When the pressure energy increases, the free piston compresses toward the left cavity, and the volume work is converted into phase change storage energy. The saturated ammonia vapor is phase-changed into saturated liquid ammonia, and the vapor-liquid mixture enters the boiler drum from the left cavity. The saturated liquid ammonia is injected into the right cavity through the connecting row pipe to balance the volume change in the cavity; when the pressure energy decreases, the free piston moves toward the right cavity, and the phase change energy releases volume work. The saturated liquid ammonia evaporates into saturated ammonia vapor. The vapor-liquid mixture enters the header from the right cavity, is injected into the boiler drum through the connecting row pipe, and is separated by the vapor-liquid separator and sent to the left cavity to balance the volume change in the cavity.

2. A semi-buried self-excavating airport pavement demolition device according to claim 1, characterized in that: Airport pavement can be divided into taxiways, runways and aprons. The joints divide the surface layer of cement concrete pavement into pieces of pavement panels. The surface layer is designed to be 30 to 80 cm thick according to the load it bears. Since there are waterproof and buffer isolation materials between the base layer and the surface layer, pits deep to the base layer are dug along the periphery of the diseased surface layer area to surround the concrete blocks in the diseased surface layer area, that is, the concrete blocks in the diseased surface layer area are separated from the concrete of the surrounding surface layers and the base layer at the bottom. A hoist is installed on the diseased concrete block, which is lifted and moved away by an engineering crane, and then the concrete can be re-poured to repair the surface layer block.

3. Digging trenches is the process of cutting cement stone from the free surface to the designed depth. The cutting process is achieved by synthesizing multiple simple motion trajectories of the blade. Cement stone is a hard and brittle non-metallic material. Under the extrusion of the blade, cracks are generated near the blade. The cracks first extend forward, and the depth exceeds the back cutting amount, forming a larger thin sheet cutting. This state is called large-scale extrusion. The blade continues to move forward, which is actually cutting off the remaining part after the collapse. At this time, small-scale extrusion occurs. Large-scale extrusion and small-scale extrusion are carried out alternately to achieve fracture damage to the cement stone.

4. Boring is a process in which a tool is mounted on a tool bar and penetrates deep into the inner hole for rotary motion to achieve cutting processing. The tool bar is designed as a circular tube structure, and the boring tool is installed on the circumferential end face of the tool bar. The tool bar is half buried in the working groove of the road panel. With the axial feed of the tool bar, the semi-cylindrical cement stone core residue is discharged from the hollow tool bar. After the residue is cleaned, a semicircular pit with a cross-section is bored out of the road panel.

5. The semi-buried self-excavating airport pavement demolition device according to claim 1 is characterized by: The reaction frame is designed with a hydraulic cylinder. When working, the piston extends to help the reaction frame to tighten the two sides of the working groove, acting as a clamp to clamp and position the cement stone, and guide the tool rod assembly and the cement stone processing surface to the correct position.

6. The semi-buried self-excavating airport pavement demolition device according to claim 1 is characterized by: The boring cutters are all in the clockwise direction and are opposite to each other in pairs. The vertical force applied to the clockwise boring cutters is directed to the ground to partially balance the extrusion force when the cutters cut into the cement stone. The boring cutters are opposite to each other in pairs to balance the radial force between them.

7. The semi-buried self-excavating airport pavement demolition device according to claim 1 is characterized in that: The boring tool works in a fully enclosed manner, and the chips cannot be discharged, which will cause the tool to be stuck. Therefore, the boring tool on the horizontal rotating shaft is half buried in the groove of the road panel, and the chips flowing out from the front of the boring tool can be cleaned by a vacuum cleaner.

8. The semi-buried self-excavating airport pavement demolition device according to claim 1 is characterized by: The power consumed by the boring tool varies greatly when cutting cement stone of different hardness and softness and when cutting in and out. The pressure energy and phase change storage energy are continuously converted by utilizing the principle of phase change conversion of saturated liquid ammonia and saturated ammonia vapor under different pressures in a pressure vessel.

9. The semi-buried self-excavating airport pavement demolition device according to claim 1 is characterized by: Since the phase change energy storage of saturated liquid ammonia balances the power consumption of the boring tool, the curve of the impact energy received by the boring tool will become much smoother. At the same time, when the frequency of the impact and vibration of the boring tool is the same as the natural frequency of the guide beam, resonance will occur, which will seriously damage the blade. The phase change energy storage in the accumulator can absorb this resonance peak very well, and the life of the boring tool will be extended. Since the flat-rotating shaft cylinder is buffered by the accumulator and then connected to the slide rail, it will undoubtedly protect the slide rail and guide rail.

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