Structure for reducing jacking resistance of jacking pipe

Abstract

The utility model relates to the technical field of pipe jacking construction, and discloses a structure for reducing the jacking resistance of a jacking pipe, which comprises a jacking pipe, a resistance reducing assembly and a driving assembly, a plurality of through holes matched with the resistance reducing assemblies are formed in the pipe wall of the jacking pipe; the driving assembly and the resistance reducing assembly are both installed in an inner cavity of the jacking pipe. According to the structure for reducing the jacking resistance of the jacking pipe, the driving assembly controls the resistance reducing assembly to stretch out and draw back the jacking pipe; when the resistance reducing assembly is contracted to the jacking pipe, the jacking pipe is in a first state that the outer wall is smooth; when the resistance reducing assembly partially extends out of the jacking pipe, the resistance reducing assembly is matched with the jacking pipe to form a drill bit structure with a spiral piece; in the jacking process of the jacking pipe, the spiral pieces are used for cutting the surrounding soil layer in a rotary advancing mode, so that the friction resistance between the spiral pieces and the soil layer is reduced, and the efficiency of the whole jacking pipe in the jacking process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe jacking construction, in particular to a structure for reducing the jacking resistance of a pipe jacking. Background Art

[0002] Pipe jacking technology is a common construction technology in modern underground engineering construction. It is widely used in urban infrastructure construction, such as subway tunnels, highway tunnels, pipeline crossings and other projects. Pipe jacking projects mainly rely on jacking machinery to jack steel pipes to form stable underground passages. During the pipe jacking construction process, the jacking resistance of the jacking pipe is an important factor affecting the efficiency of the project. The jacking resistance mainly comes from the resistance of the underground soil layer to the jacking pipe, the friction resistance of the jacking pipe and other factors. Generally, the existing pipe jacking equipment mainly includes jacking pipes, jacking machines, driving equipment, etc. Among them, the jacking pipe is usually a hard steel pipe. The jacking machine transmits force to the jacking pipe through driving equipment such as hydraulic cylinders, so that it can be jacked in the underground soil layer. During the jacking process, the outer wall of the jacking pipe contacts the soil layer, forming a large resistance.

[0003] In order to reduce the resistance, the existing technology mainly reduces the friction resistance of the jacking pipe by changing the structure or material of the jacking pipe, but the effect of this method is limited. The change of the structure and material of the jacking pipe cannot change the fact that it is in contact with the soil layer. Therefore, there will still be a large resistance during the jacking process. Utility Model Content

[0004] The utility model aims to provide a structure for reducing the jacking resistance of a jacking pipe, so as to solve the problem in the prior art that the resistance generated by the contact between the jacking pipe and the soil layer cannot be changed.

[0005] The technical solution adopted by the utility model is:

[0006] A structure for reducing the jacking resistance of a jacking pipe, the structure comprising a jacking pipe, a resistance reduction assembly and a driving assembly; the jacking pipe is a hollow pipe structure, a passage for transporting excavated soil is formed inside the jacking pipe, and a plurality of through holes for cooperating with the resistance reduction assembly are provided on the pipe wall; the driving assembly is installed in the inner cavity of the jacking pipe and is located on the inner side of the resistance reduction assembly, and can drive the resistance reduction assembly to extend and retract relative to the jacking pipe; the resistance reduction assembly is installed in the inner cavity of the jacking pipe and is located between the driving assembly and the inner wall of the jacking pipe; when the resistance reduction assembly is retracted to the jacking pipe, the jacking pipe is in a first state with a smooth outer wall; when the resistance reduction assembly partially extends to the outside of the jacking pipe, the resistance reduction assembly cooperates with the jacking pipe to form a drill bit structure with spiral blades.

[0007] Furthermore, a first stopper, a second stopper and an auxiliary mounting tube are installed inside the jacking tube; the auxiliary mounting tube is coaxially arranged with the jacking tube, and the first stopper and the second stopper are respectively mounted on both ends of the auxiliary mounting tube, and the first stopper and the second stopper are both annular plate structures, and the outer edges of the first stopper and the second stopper are fixedly connected to the inner wall of the jacking tube. The first stopper, the second stopper, the outside of the auxiliary mounting tube, and the inner wall of the jacking tube form a cylindrical mounting cavity, and the resistance reduction assembly and the drive assembly are installed in the mounting cavity.

[0008] Furthermore, the resistance reduction component includes a connecting plate, a spiral plate and a connecting rib; there are multiple connecting plates, and the multiple connecting plates are movably arranged in the inner cavity of the jacking pipe, and the connecting plates are in the same direction as the jacking pipe and are arranged circumferentially along the inner wall of the jacking pipe; multiple spiral plates are installed on the outside of each connecting plate, and the spiral plates can pass through the through holes on the wall of the jacking pipe, and the spiral plates on the multiple connecting plates are arranged in a spiral shape with the jacking pipe as the axis; the inner side of each connecting plate is installed on the connecting rib, the connecting rib is a plate structure and is the same length as the connecting plate, the connecting rib is connected to the connecting plate in a T-shape, and a driving groove is provided on the connecting rib, and the driving groove is inclined.

[0009] Furthermore, the spiral blade is a plate structure with a blade on the edge.

[0010] Furthermore, the spiral sheets on the multiple connecting sheets have the same pitch.

[0011] Furthermore, the drive assembly includes a sleeve slidably mounted on the auxiliary mounting tube, and multiple groups of limit plates are installed on the outer wall of the sleeve. The two plate bodies of each group of limit plates are respectively located on the left and right sides of the connecting rib, and a limit pin passing through the drive groove is provided between the two plate bodies; the drive assembly also includes a motor mounted on the sleeve, a screw rod connected to the motor, and a screw rod nut threadedly connected to the screw rod; one end of the screw rod is fixedly connected to the output end of the motor, and the other end is rotatably mounted on the first stop member; the screw rod nut is mounted on the screw rod and fixedly connected to the sleeve.

[0012] The beneficial effects of the utility model are:

[0013] The structure for reducing the jacking resistance of the jacking pipe has a built-in resistance reducing component and a driving component on the basis of the jacking pipe, and the driving component controls the resistance reducing component to extend and retract the jacking pipe; when the resistance reducing component is retracted to the jacking pipe, the jacking pipe is in a first state with a smooth outer wall; when the resistance reducing component partially extends to the outside of the jacking pipe, the resistance reducing component cooperates with the jacking pipe to form a drill bit structure with spiral blades; during the jacking process, the jacking pipe rotates and advances, and uses the spiral blades to cut the surrounding soil layer, thereby reducing the friction resistance with the soil layer, thereby improving the efficiency of the entire jacking process of the jacking pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is a schematic diagram of the overall structure of the structure for reducing the jacking resistance of the jacking pipe according to the utility model;

[0015] Figure 2 It is a schematic diagram of the internal structure of the structure for reducing the jacking resistance of the jacking pipe according to the utility model;

[0016] Figure 3 and Figure 4 It is a structural schematic diagram of the resistance reduction component and the driving component of the utility model;

[0017] Figure 5 This is a schematic diagram of the structure of the resistance reduction component of the utility model;

[0018] Figure 6 It is a structural schematic diagram of the sleeve of the drive assembly of the utility model;

[0019] In the figure: 1. jacking tube; 2. resistance reduction component; 3. drive component; 4. channel; 5. through hole; 6. first stopper; 7. second stopper; 8. auxiliary mounting tube; 9. mounting cavity; 10. connecting plate; 11. spiral plate; 12. connecting rib; 13. drive groove; 14. sleeve; 15. limit plate; 16. limit pin; 17. motor; 18. screw rod; 19. screw rod nut. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings of the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] This embodiment provides a structure for reducing the jacking resistance of the jacking pipe. Figure 1 As shown, the structure for reducing the jacking resistance of the jacking pipe includes a jacking pipe 1, which is a hollow pipe structure, and a channel 4 for transporting excavated soil is formed inside the jacking pipe. A plurality of through holes 5 for matching the resistance reduction component 2 are provided on the pipe wall. Figure 2 As shown, in this embodiment, a resistance reduction component 2 and a driving component 3 are installed inside the jacking pipe 1, so that the jacking pipe 1 can form two states: state one: the driving component 3 drives the resistance reduction component 2 to retract inside the jacking pipe 1, and the jacking pipe 1 is in the first state with a smooth outer wall; state two: Figure 1 As shown, the driving component 3 drives the resistance reduction component 2 to partially extend outside the jacking pipe 1. At this time, the resistance reduction component 2 cooperates with the jacking pipe 1 to form a drill bit structure with spiral blades. In this state, when the jacking pipe 1 is jacked in a rotating forward manner, the spiral blades cut the surrounding soil layer, thereby reducing the friction resistance with the soil layer, thereby improving the efficiency of the entire jacking process.

[0022] Considering the installation of the resistance reduction component 2 and the driving component 3 in the jacking pipe 1, and ensuring the passage 4 inside the jacking pipe 1 for transporting the excavated soil; Figure 2 and Figure 3 As shown, in this embodiment, a first stopper 6, a second stopper 7 and an auxiliary installation tube 8 are installed inside the jacking tube 1. The auxiliary installation tube 8 is a hollow tube structure, which is coaxially arranged with the jacking tube 1; when the excavated soil is transported, the excavated soil at the front end of the jacking tube 1 can be transported to the rear end of the jacking tube 1 through the auxiliary installation tube 8 manually by a trolley. The first stopper 6 and the second stopper 7 are respectively mounted on both ends of the auxiliary installation tube 8, and the first stopper 6 and the second stopper 7 are both annular plate structures, which are used to limit the resistance reduction component 2 and the drive component 3; the outer edges of the first stopper 6 and the second stopper 7 are fixedly connected to the inner wall of the jacking tube 1. The first stopper 6, the second stopper 7, the outside of the auxiliary installation tube 8, and the inner wall of the jacking tube 1 form a cylindrical installation cavity 9, and the resistance reduction component 2 and the drive component 3 are installed in the installation cavity 9.

[0023] Figure 3 , Figure 4 and Figure 5 As shown, the resistance reduction component 2 in this embodiment is installed in the inner cavity of the jacking pipe 1 and is located between the driving component 3 and the inner wall of the jacking pipe 1. The resistance reduction component 2 includes a connecting piece 10, a spiral piece 11 and a connecting rib 12; the number of the connecting pieces 10 is six, and the six connecting pieces 10 are movably arranged in the inner cavity of the jacking pipe 1. The connecting pieces 10 are in the same direction as the jacking pipe 1 and are arranged circumferentially along the inner wall of the jacking pipe 1. Five spiral pieces 11 are installed on the outside of each connecting piece 10. The spiral piece 11 is a plate structure with a blade on the edge. The spiral pieces 11 on the six connecting pieces 10 have the same pitch. The spiral piece 11 can pass through the through hole 5 on the wall of the jacking pipe 1. The spiral pieces 11 on the multiple connecting pieces 10 are arranged in a spiral shape with the jacking pipe 1 as the axis, so that when the jacking pipe 1 is in state two, a spiral cutting piece is formed on the outside of its wall. The inner side of each connecting piece 10 is installed on the connecting rib 12. The connecting rib 12 is a plate structure and is the same length as the connecting piece 10. The connecting rib 12 is connected to the connecting piece 10 in a T shape. A driving groove 13 is provided on the connecting rib 12, and the driving groove 13 is inclined. The connecting rib 12 and the driving groove 13 are used to cooperate with the driving component 3 to drive it to extend and retract.

[0024] like Figure 2 , Figure 3 and Figure 5As shown, the driving assembly 3 in this embodiment is installed in the inner cavity of the jacking pipe 1 and is located on the inner side of the resistance reduction assembly 2, so as to drive the resistance reduction assembly 2 to extend and retract relative to the jacking pipe 1, and provide the switching power between the first state and the second state. The driving assembly 3 includes a sleeve 14 slidably mounted on the auxiliary mounting pipe 8, and six groups of limit plates 15 are installed on the outer wall of the sleeve 14. The six groups of limit plates 15 each include two plate bodies, and the two plate bodies are respectively located on the left and right sides of the connecting rib 12, and a limit pin 16 passing through the driving groove 13 is provided between the two plate bodies. The drive assembly 3 also includes a motor 17 mounted on the sleeve 14, a screw 18 connected to the motor 17, and a screw nut 19 threadedly connected to the screw 18; the motor 17 adopts a commercially available high-power forward and reverse motor, and a wire hole can be set on the auxiliary mounting tube 8 to meet the power line connection of the motor 17; one end of the screw 18 is fixedly connected to the output end of the motor 17, and the other end is rotatably mounted on the first stopper 6; the screw nut 19 is sleeved on the screw 18 and fixedly connected to the sleeve 14.

[0025] In the pipe jacking resistance reduction structure provided in the present application, the built-in resistance reduction component 2 cooperates with the driving component 3 to reduce the jacking resistance of the jacking pipe 1. When the motor 17 of the driving component 3 is started, the output shaft of the motor 17 drives the screw 18 to rotate forward, and the screw nut 19 drives the sleeve 14 to slide forward on the auxiliary mounting tube 8; the limit pins 16 on the six groups of limit plates 15 of the sleeve 14 move forward in the driving groove 13 of the connecting rib 12. Since the driving groove 13 is inclined, the limit pins 16 move forward while moving the connecting rib 12 outward, and the connecting rib 12 drives the connecting piece 10 to move outward, so that the five spiral pieces 11 on each connecting piece 10 pass through the through hole 5 on the wall of the jacking pipe 1 and extend to the outside of the jacking pipe 1; the driving component 3 drives the resistance reduction component 2 to switch the jacking pipe 1 from the first state to the second state.

[0026] In the first state, the resistance reduction component 2 is completely received in the inner cavity of the jacking pipe 1, ensuring that the jacking pipe 1 can smoothly start its jacking process. When it is necessary to reduce the resistance, the driving component 3 drives the resistance reduction component 2 to make the spiral blades 11 of the resistance reduction component 2 extend to the outside of the jacking pipe 1. At this time, a resistance reduction spiral shape is formed. This spiral structure can cut the soil layer when the jacking pipe 1 rotates, similar to the role of a drill bit, thereby reducing the resistance of the soil to the jacking pipe and reducing the jacking resistance. This transformation process is accurately executed by the motor 17 of the driving component 3, which not only ensures that the initial stage of the jacking construction is not affected by the resistance, but also effectively reduces the jacking resistance according to the actual needs of the soil conditions during the jacking stage, thereby optimizing the construction efficiency.

[0027] During the process of switching the jacking tube 1 from the first state to the second state, the first stop 6 and the second stop 7 limit the maximum movement stroke of the sleeve 14 of the driving assembly 3. At the same time, the cylindrical installation cavity 9 formed by the first stop 6, the second stop 7, the outside of the auxiliary installation tube 8, and the inner wall of the jacking tube 1 limits the connecting piece 10 and the connecting rib 12 of the resistance reduction assembly 2 to move only outward or inward.

[0028] It should be noted that the rear end of the jacking pipe in this embodiment needs to be equipped with an additional drive motor and a hydraulic cylinder during the actual construction process to provide the jacking pipe 1 with rotational forward power; conventional jacking pipe construction requires an additional hydraulic cylinder to provide the jacking pipe 1 with linear forward power.

[0029] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A structure for reducing pipe jacking resistance, characterized in that: The structure for reducing the jacking resistance of a jacking pipe comprises a jacking pipe, a resistance reduction component and a driving component; the jacking pipe is a hollow pipe structure, a passage for transporting excavated soil is formed inside the jacking pipe, and a plurality of through holes cooperating with the resistance reduction component are provided on the pipe wall; the driving component is installed in the inner cavity of the jacking pipe and is located on the inner side of the resistance reduction component, and can drive the resistance reduction component to extend and retract relative to the jacking pipe; the resistance reduction component is installed in the inner cavity of the jacking pipe and is located between the driving component and the inner wall of the jacking pipe; when the resistance reduction component is retracted to the jacking pipe, the jacking pipe is in a first state with a smooth outer wall; when the resistance reduction component partially extends to the outside of the jacking pipe, the resistance reduction component cooperates with the jacking pipe to form a drill bit structure with spiral blades.

2. The structure for reducing pipe jacking resistance according to claim 1 is characterized in that: The first stopper, the second stopper and the auxiliary mounting tube are installed inside the jacking tube; the auxiliary mounting tube is coaxially arranged with the jacking tube, and the first stopper and the second stopper are respectively mounted on both ends of the auxiliary mounting tube, and the first stopper and the second stopper are both annular plate structures, and the outer edges of the first stopper and the second stopper are fixedly connected to the inner wall of the jacking tube. The first stopper, the second stopper, the outside of the auxiliary mounting tube, and the inner wall of the jacking tube form a cylindrical mounting cavity, and the resistance reduction assembly and the drive assembly are installed in the mounting cavity.

3. The structure for reducing pipe jacking resistance according to claim 2 is characterized in that: The resistance reduction component includes a connecting piece, a spiral piece and a connecting rib; there are multiple connecting pieces, and the multiple connecting pieces are movably arranged in the inner cavity of the jacking pipe. The connecting pieces are in the same direction as the jacking pipe and are arranged circumferentially along the inner wall of the jacking pipe; multiple spiral pieces are installed on the outer side of each connecting piece, and the spiral pieces can pass through the through holes on the wall of the jacking pipe. The spiral pieces on the multiple connecting pieces are arranged in a spiral shape with the jacking pipe as the axis; the inner side of each connecting piece is installed on the connecting rib, the connecting rib is a plate structure and is the same length as the connecting piece, the connecting rib is connected to the connecting piece in a T-shape, and a driving groove is provided on the connecting rib, and the driving groove is inclined.

4. The structure for reducing pipe jacking resistance according to claim 3 is characterized in that: The spiral sheet is a plate structure with a blade on the edge.

5. The structure for reducing pipe jacking resistance according to claim 3 is characterized in that: The spiral sheets on the multiple connecting sheets have the same pitch.

6. The structure for reducing pipe jacking resistance according to claim 3 is characterized in that: The driving assembly includes a sleeve that is slidably mounted on the auxiliary mounting tube, and a plurality of groups of limit plates are installed on the outer wall of the sleeve. The two plate bodies of each group of limit plates are respectively located on the left and right sides of the connecting rib, and a limit pin passing through the driving groove is provided between the two plate bodies; the driving assembly also includes a motor mounted on the sleeve, a screw rod connected to the motor, and a screw rod nut threadedly connected to the screw rod; one end of the screw rod is fixedly connected to the output end of the motor, and the other end is rotatably mounted on the first stopper; the screw rod nut is mounted on the screw rod and fixedly connected to the sleeve.

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