A method for connecting a high-speed rail floor with an existing subway roof

Abstract

The application belongs to the technical field of existing line reconstruction engineering, and provides a high-speed rail bottom plate and existing subway top plate connection construction method, comprising: step S1, excavating the soil around the upper layer of the connection position of the existing subway top plate; step S2, after excavating to the vicinity of the connection node range, using the artificial cleaning method to leak the structure surface, during which the concrete is chiseled out by using the wind pick device, the embedded sleeve in the existing subway top plate structure surface is leaked, and the concrete of the existing subway top plate structure surface is chiseled out in a stepped manner to form a staggered table; step S3, using a brush to clean the embedded sleeve one by one, and using lubricating oil to lubricate the screw thread to ensure normal use. Compared with the traditional connection method, the application can greatly improve the stability of the connection between the high-speed rail bottom plate and the existing subway top plate, ensure that the shear capacity of the connection surface can withstand larger static and dynamic loads, and the connection construction process of the application is not only efficient, but also high in quality.

Description

Technical Field

[0001] This invention relates to the field of existing railway line renovation engineering technology, and in particular to a method for connecting the base plate of a high-speed railway with the roof plate of an existing subway. Background Technology

[0002] With the increasing density of urban rail transit networks and the advancement of integrated transportation hub construction, it is becoming increasingly common for newly built high-speed railway (HSR) stations or passages to intersect, be adjacent to, or even directly connect with existing subway lines. In such projects, the connection construction between the new high-speed railway structure base slab and the existing subway tunnel or station roof slab faces extremely high technical challenges and safety risks.

[0003] The complexity of the stress on the connection between the old and new structures is a technical challenge. The high-speed rail base slab and the existing subway roof slab are concrete structures from different periods and with different design standards. The connection nodes between the two need to withstand complex combinations of static and dynamic loads. Traditional methods often face problems such as insufficient shear resistance at the interface between the old and new concrete and difficulty in anchoring the reinforcing bars.

[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for connecting a high-speed railway base slab with an existing subway roof slab, in order to solve the problems of insufficient shear resistance of the interface between the old and new concrete and difficulty in anchoring steel bars in the traditional construction of connecting the high-speed railway base slab with the existing subway roof slab.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a construction method for connecting a high-speed railway base slab with an existing subway roof slab, comprising: Step S1, excavating the soil surrounding the upper layer of the existing subway roof slab at the connection location; Step S2, after excavating to near the connection node, manually cleaning to expose the structural surface, during which a pneumatic pick is used to remove the concrete, exposing the pre-embedded sleeves in the structural surface of the existing subway roof slab, the concrete of the existing subway roof slab structural surface after removal is stepped to form a staggered joint; Step S3, cleaning each pre-embedded sleeve with a brush, and lubricating the threads with lubricating oil to ensure normal use; Step S4, connecting the reinforcing steel group of the high-speed railway base slab with the pre-embedded sleeves on the vertical surface of the staggered joint of the existing subway roof slab; Step S5, pouring the high-speed railway base slab, and reserving grouting pipes at the connection location, and grouting according to design requirements after the structure is poured to ensure the connection is dense.

[0007] Preferably, the pneumatic pick device in step S2 includes: a support and a pneumatic pick; The support consists of a pair of crossbeams and diagonal braces, with the two crossbeams spaced apart to form a U-shaped frame in the center. The jackhammer passes through the frame and rests its handle on top of the frame.

[0008] Preferably, the two diagonal bracing legs are symmetrically arranged at both ends of the crossbeam plate to form a figure-eight shape, and the diagonal bracing legs are composed of a pair of spaced diagonal plates; The upper ends of two adjacent inclined plates are hinged to the inner side of the corresponding crossbeam plate end, and the lower ends are connected to a support plate. The bottom of the tray is movably equipped with casters.

[0009] Preferably, a disc plate is fixed to the outer side of the end of the crossbeam plate and centered thereon, and a limit plate is connected between two adjacent disc plates; The diameter of the disc plate is greater than the vertical width of the crossbeam plate, so that the bottom part of the disc plate corresponding to the inclined plate is fixed by a positioning pin.

[0010] Preferably, a spring is connected between the angle between the inclined plate and the crossbeam plate.

[0011] Preferably, the bottom of the pneumatic pick is fitted with a conical dust cover; The dust cover has a connector protruding upwards at the top, a dust suction chamber located at the top inside the dust cover, and a dust suction port located around the inner wall of the dust cover corresponding to the dust suction chamber.

[0012] Preferably, a dust collection tube is installed between the two inclined plates of one of the inclined support legs; A suction tube is provided between the vacuum cleaner cylinder and the dust cover, and the suction tube is connected to the suction chamber of the dust cover.

[0013] Preferably, a connecting pipe is fixedly fitted on the outer bottom of the pneumatic pick, and the connecting pipe is located above the dust cover; A flexible hose is provided between the joint and the connecting pipe of the dust cover; The upper end of the telescopic hose is fixedly fitted onto the outside of the connecting pipe, and the lower end is fixedly fitted onto the outside of the dust cover connector.

[0014] Preferably, the pneumatic pick is lifted with the assistance of two sets of pulleys, and the two sets of pulleys are symmetrically arranged on both sides of the pneumatic pick; The pulley system consists of a single movable pulley, a pair of fixed pulleys, and a rope. The movable pulley is rotatably installed in the middle of the jackhammer, and the two fixed pulleys are located at the middle and end of the outer side of the crossbeam plate, respectively. One end of the pull rope is fixed to the center of the crossbeam plate, and the other end of the pull rope first goes around the bottom of the movable pulley, then around to the top of the fixed pulley in the middle of the crossbeam plate, and extends horizontally to the top of the fixed pulley at the end of the crossbeam plate before hanging down.

[0015] Preferably, a foot pedal is suspended from the lower end of the pull rope; The pedal is equipped with a hanging ring at one end, and the center of the hanging ring is connected to the hanging end of the pull rope.

[0016] Compared with the closest existing technology, the technical solution of the embodiments of the present invention has the following beneficial effects: Compared with traditional connection methods, the present invention can significantly improve the stability of the connection between the high-speed rail base plate and the existing subway roof plate, ensuring that the shear resistance of the connection surface can withstand large static and dynamic loads. Furthermore, the connection construction process of the present invention is not only fast but also of high quality. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram showing the connection between the high-speed rail base plate and the existing subway roof plate of the present invention; Figure 2 This is a front view of the pneumatic pick device in step S2 of the present invention; Figure 3 This is a schematic diagram of the overall structure of the pneumatic pick device of the present invention; Figure 4 for Figure 1 Cross-sectional view of the dust cover structure.

[0018] In the diagram: 1. Pneumatic hammer; 2. Crossbeam; 3. I-beam frame; 4. Inclined plate; 5. Support plate; 6. Casters; 7. Disc plate; 8. Limiting plate; 9. Spring; 10. Dust cover; 11. Dust suction chamber; 12. Dust suction port; 13. Dust suction cylinder; 14. Dust suction duct; 15. Connecting pipe; 16. Telescopic hose; 17. Moving pulley; 18. Fixed pulley; 19. Pull rope; 20. Pedal; 21. Lifting ring. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0020] In the following description, the terms "first / second / third" are used merely to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of the invention described herein can be implemented in an order other than that illustrated or described herein.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to limit this disclosure.

[0022] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0023] This invention provides a construction method for connecting a high-speed railway base plate to an existing subway roof plate. The connection surface has a stable structure, strong shear resistance, and high construction efficiency and quality.

[0024] Example 1, referring to Figure 1 This construction method includes: Step S1, excavating the soil surrounding the upper layer of the existing subway roof slab at the connection point, strictly prohibiting over-excavation, and ensuring the compactness of the structural base; Step S2, after excavating to near the connection node, manually cleaning to expose the structural surface, during which a pneumatic pick is used to remove the concrete, exposing the pre-embedded sleeves in the structural surface of the existing subway roof slab. After the concrete of the existing subway roof slab structural surface is removed, it will be stepped to form a staggered platform; Step S3, cleaning each pre-embedded sleeve with a brush and lubricating the threads with lubricating oil to ensure normal use; Step S4, connecting the steel reinforcement group of the high-speed rail base slab to the pre-embedded sleeves on the vertical surface of the staggered platform of the existing subway roof slab. Before this, water-stop steel plates and rubber water-stop strips can be installed at the construction joint; Step S5, pouring the high-speed rail base slab, and reserving grouting pipes at the connection point. After the structure is poured, grouting is carried out according to the design requirements to ensure the compactness of the connection.

[0025] Reference Figures 2-4The pneumatic pick 1 device in step S2 includes a support and a pneumatic pick 1. The support consists of a pair of crossbeams 2 and diagonal braces. The two crossbeams 2 are spaced apart to allow a U-shaped frame 3 to be movably mounted in the center. The front and rear sides of the U-shaped frame 3 are rotatably mounted between the two crossbeams 2 via pins, so that the U-shaped frame 3 can rotate in the left and right direction. The pneumatic pick 1 passes through the U-shaped frame 3 and the handle of the pneumatic pick 1 rests on the top of the U-shaped frame 3. The U-shaped frame 3 provides a certain support for the pneumatic pick 1. The pneumatic pick 1 can also be moved left and right using the U-shaped frame 3.

[0026] Two diagonal bracing legs are symmetrically arranged at the left and right ends of the crossbeam plate 2 to form a figure-eight shape. The diagonal bracing legs are composed of a pair of spaced diagonal plates 4. The upper ends of the two adjacent diagonal plates 4 on the same side are hinged to the inner side of the corresponding end of the crossbeam plate 2 through pins, so that the diagonal bracing legs can swing outward. The lower ends of the two diagonal plates 4 on the same side are welded together with a support plate 5. A pair of universal wheels 6 are movably installed at the bottom of the support plate 5 to ensure stable support.

[0027] Two circular plates 7 are welded and fixed to the outer ends of the two crossbeam plates 2, and are centered vertically. A limiting plate 8 is welded and fixed between two adjacent circular plates 7. The limiting plate 8 restricts the maximum angle of outward swing of the diagonal support legs. The diameter of the circular plate 7 is larger than the vertical width of the crossbeam plate 2, so that the bottom part of the circular plate 7 corresponding to the inclined plate 4 can be fixed by the positioning pin. The purpose is to fix the position of the inclined plate 4, mainly for use when the jackhammer 1 is idle. A spring 9 is connected between the angle between the inclined plate 4 and the crossbeam plate 2. The two ends of the spring 9 are fixed to the top side of the inclined plate 4 and the bottom of the crossbeam plate 2 respectively. The spring 9 is used to facilitate the reset of the two diagonal support legs. When the jackhammer 1 removes concrete, it will press down on the crossbeam plate 2, causing the lower ends of the two diagonal support legs to open outward. After the jackhammer 1's chisel is pulled upward, the spring 9 can automatically reset the diagonal support legs, while not hindering the downward movement of the jackhammer 1.

[0028] In this embodiment, when the pneumatic pick 1 is idle, the bottom of the pneumatic pick 1 will not contact the ground, and the entire device is hung on the crossbeam by the handle.

[0029] The bottom of the pneumatic pick 1 is fitted with a conical transparent dust cover 10. The top of the dust cover 10 has a vertically protruding connector. A layer of rubber wear-resistant pad can be adhered to the bottom of the dust cover 10. The dust cover 10 has a dust suction chamber 11 located at the top inside. Corresponding to the dust suction chamber 11, a dust suction port 12 is provided around the inner wall of the dust cover 10 to prevent the dust suction port 12 from being too low and easily sucking in stone particles. A connecting pipe 15 is welded and fitted to the outside of the bottom of the pneumatic pick 1, and the connecting pipe 15 is located above the dust cover 10. A telescopic hose 16 is provided between the connector of the dust cover 10 and the connecting pipe 15. The upper end of the telescopic hose 16 is fixedly fitted to the outside of the connecting pipe 15 by a cable tie, and the lower end is fixedly fitted to the outside of the connector of the dust cover 10 by a cable tie. The body of the telescopic hose 16 is corrugated to adapt to the telescopic state.

[0030] In this embodiment, a dust collection cylinder 13 is installed between the two inclined plates 4 on the right side of the inclined support leg. Baffles are welded between the two inclined plates 4 corresponding to the top and bottom of the dust collection cylinder 13. The dust collection cylinder 13 is then tied between the two inclined plates 4 with straps. A dust collection duct 14 is provided between the dust collection cylinder 13 and the dust cover 10. The dust collection duct 14 is connected to the dust collection chamber 11 of the dust cover 10. The dust collection duct 14 can also be telescopic, or the dust collection duct 14 can be reserved with sufficient length to allow the dust collection cylinder 13 to move with the inclined support leg. The dust collection cylinder 13 can be selected from a dust treatment device for factories (CN212238569U), or a commonly available and compatible dust collection device can be selected.

[0031] Example 2, refer to Figures 2-4 To improve the efficiency of workers using pneumatic picks 1 to remove concrete and reduce their labor intensity, pneumatic pick 1 is assisted in being lifted by two sets of pulleys. These two sets of pulleys are symmetrically arranged on the front and rear sides of pneumatic pick 1. Each pulley consists of a single movable pulley 17, a pair of fixed pulleys 18, and a rope 19. The movable pulley 17 is rotatably mounted in the middle of pneumatic pick 1 via a shaft. The two fixed pulleys 18 are rotatably mounted on the outer middle and near the end of the crossbeam plate 2, respectively, via shafts. One end of the rope 19 is fixed to the center of the crossbeam plate 2. Specifically, a positioning plate is welded to the center of the bottom of the crossbeam plate 2, through which the fixed end of the rope 19 is extended upwards. After passing through the center of the positioning plate, upsetting is performed to prevent backflow. The other end of the pull rope 19 first passes around the bottom of the lower movable pulley 17, then passes around to the top of the fixed pulley 18 in the middle of the crossbeam plate 2, and extends horizontally to the top of the fixed pulley 18 near the end of the crossbeam plate 2 before hanging down. The hanging end of the pull rope 19 is suspended by a footboard 20. Both the front and rear ends of the footboard 20 are welded with lifting rings 21. The center of the lifting ring 21 is fixedly connected to the corresponding hanging end of the pull rope 19. The pick of the pneumatic hammer 1 can be easily pulled out from the cracked concrete layer using the pulley system without the need for workers to pull it out by force. It is extremely labor-saving and very suitable for large-area concrete removal operations.

[0032] In actual operation, the concrete surface is chiseled along the longitudinal line and gradually advanced along the transverse line. When a certain area of ​​concrete surface is chiseled away, the corresponding diagonal support legs are covered with templates on the broken concrete blocks to ensure that the support can move smoothly along the longitudinal line. During this process, the worker holds the handle of the pneumatic pick 1 with both hands and uses the pick's chisel to break and chisel away the concrete surface. The dust generated during chiseling is sucked into the dust collection tube 13 for collection. After the pick reaches a certain depth, the lower ends of the two diagonal support legs also extend outward to the maximum depth. At this time, the worker steps on the pedal 20 to lift the pneumatic pick 1 and quickly pull the pick from the broken concrete.

[0033] The pneumatic pick 1 device provided in this embodiment is simple and convenient to operate, which can greatly reduce the labor intensity of workers, improve the efficiency of concrete removal, and greatly reduce the dust generated when breaking concrete, providing a good and healthy construction environment on site.

[0034] Compared with traditional connection methods, this construction method can significantly improve the stability of the connection between the high-speed rail base plate and the existing subway roof plate, ensuring that the shear resistance of the connection surface can withstand large static and dynamic loads. Furthermore, the connection construction process of this invention is not only efficient but also of high quality.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A construction method for connecting a high-speed railway floor slab to an existing subway roof slab, characterized in that, include: Step S1: Excavate the soil surrounding the upper layer of the existing subway roof slab at the connection point. Step S2: After excavating to near the connection node, the structural surface is exposed by manual cleaning. During this process, the concrete is removed using a pneumatic pick to expose the embedded sleeve in the existing subway roof structure. The concrete of the existing subway roof structure is removed in a stepped shape to form a staggered platform. Step S3: Clean each embedded sleeve with a brush and lubricate the threads with lubricating oil to ensure normal use; Step S4: Connect the steel reinforcement group of the high-speed rail base plate to the pre-embedded sleeve on the staggered vertical surface of the existing subway roof plate. Step S5: Pour the high-speed rail base plate and reserve grouting pipes at the connection points. After the structure is poured, grouting is carried out according to the design requirements to ensure that the connection is tight.

2. The construction method for connecting the high-speed railway base plate and the existing subway roof plate according to claim 1, characterized in that, The pneumatic pick device in step S2 includes: a support frame and a pneumatic pick; The support consists of a pair of crossbeams and diagonal braces, with the two crossbeams spaced apart to form a U-shaped frame in the center. The jackhammer passes through the frame and rests its handle on top of the frame.

3. The construction method for connecting the high-speed railway base plate and the existing subway roof plate according to claim 2, characterized in that, The two diagonal bracing legs are symmetrically arranged at both ends of the crossbeam plate to form a figure-eight shape. The diagonal bracing legs are composed of a pair of spaced-apart diagonal plates. The upper ends of two adjacent inclined plates are hinged to the inner side of the corresponding crossbeam plate end, and the lower ends are connected to a support plate. The bottom of the tray is movably equipped with casters.

4. The construction method for connecting the high-speed railway base plate and the existing subway roof plate according to claim 3, characterized in that, A disc plate is fixed to the outer side of the end of the crossbeam plate and centered thereon, and a limit plate is connected between two adjacent disc plates. The diameter of the disc plate is greater than the vertical width of the crossbeam plate, so that the bottom part of the disc plate corresponding to the inclined plate is fixed by a positioning pin.

5. The construction method for connecting the high-speed railway base plate and the existing subway roof plate according to claim 4, characterized in that, A spring connects the angle between the inclined plate and the crossbeam plate.

6. The construction method for connecting the high-speed railway base slab and the existing subway roof slab according to claim 3, characterized in that, The bottom of the pneumatic pick is fitted with a conical dust cover; The dust cover has a connector protruding upwards at the top, a dust suction chamber located at the top inside the dust cover, and a dust suction port located around the inner wall of the dust cover corresponding to the dust suction chamber.

7. The construction method for connecting the high-speed railway base plate and the existing subway roof plate according to claim 6, characterized in that, A dust collection cylinder is installed between the two inclined plates of one of the inclined support legs; A suction tube is provided between the vacuum cleaner cylinder and the dust cover, and the suction tube is connected to the suction chamber of the dust cover.

8. The construction method for connecting the high-speed railway base plate and the existing subway roof plate according to claim 7, characterized in that, The bottom outer side of the jackhammer is fixedly fitted with a connecting pipe, which is located above the dust cover; A flexible hose is provided between the joint and the connecting pipe of the dust cover; The upper end of the telescopic hose is fixedly fitted onto the outside of the connecting pipe, and the lower end is fixedly fitted onto the outside of the dust cover connector.

9. The construction method for connecting the high-speed railway base plate and the existing subway roof plate according to claim 1, characterized in that, The pneumatic pick is lifted with the assistance of two sets of pulleys, and the two sets of pulleys are symmetrically arranged on both sides of the pneumatic pick. The pulley system consists of a single movable pulley, a pair of fixed pulleys, and a rope. The movable pulley is rotatably installed in the middle of the jackhammer, and the two fixed pulleys are located at the middle and end of the outer side of the crossbeam plate, respectively. One end of the pull rope is fixed to the center of the crossbeam plate, and the other end of the pull rope first goes around the bottom of the movable pulley, then around to the top of the fixed pulley in the middle of the crossbeam plate, and extends horizontally to the top of the fixed pulley at the end of the crossbeam plate before hanging down.

10. The construction method for connecting the high-speed railway base plate and the existing subway roof plate according to claim 9, characterized in that, A foot pedal is suspended from the lower end of the pull rope; The pedal is equipped with a hanging ring at one end, and the center of the hanging ring is connected to the hanging end of the pull rope.

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