An assembled adjustable subway tunnel section support frame

Abstract

The present invention discloses an assembled adjustable subway tunnel section support frame, which relates to the field of subway tunnel support technology, including a body and a length adjustment mechanism, wherein the length adjustment mechanism is arranged in the body, a plurality of support mechanisms are arranged outside the length adjustment mechanism, a plurality of pressure adjustment mechanisms are arranged on the top of the support mechanism, the body includes a support frame, the support frames are assembled and connected, a plurality of connecting frames are arranged outside the support frame, and each of the connecting frames is hingedly connected to the support frame. The assembled adjustable subway tunnel section support frame is not only easy to adjust when in use, but also can prevent the deformation from aggravating when a certain point of the tunnel is deformed through the pressure adjustment mechanism, and can disperse the pressure on the support frame at that location to other locations, effectively increasing the firmness of the device.

Description

Technical Field

[0001] The invention relates to the technical field of subway tunnel support frames, and in particular to an assembled adjustable subway tunnel section support frame. Background Art

[0002] Tunnels are engineering structures buried in the ground and are a form of human use of underground space. Generally, tunnel construction work is frequently involved in the process of subway construction. The emergence of tunnel construction has played a significant role in the development of transportation engineering. In order to prevent the collapse of tunnels due to unstable structures, it is necessary to use tunnel section support mechanisms to carry out support work during tunnel construction.

[0003] The Chinese invention patent with the publication number CN114483124A discloses an adjustable tunnel section support mechanism for subway construction, which drives the screw rod at the axial position of the fixed cylinder to rotate in the front-back direction through a driving device, and under the limiting action of the guide rail guide rod, the movable frame moves backward on the screw rod, and the push rod pushes the support rod to move radially outward along the fixed cylinder, pushing the support plate to move outward to adapt to the tunnel section support with a larger diameter, or, under the limiting action of the guide rail guide rod, the movable frame moves forward on the screw rod, and the push rod pulls the support rod to move radially inward along the fixed cylinder, pulling the support plate to move inward to adapt to the tunnel section support with a smaller diameter. The adjustable tunnel section support mechanism for subway construction of the above invention can change the support position according to the actual diameter of the tunnel, so as to have a wide range of applications, reduce construction costs, have a clever design, a simple structure, simple manufacturing, low cost, and is suitable for large-scale promotion and application.

[0004] However, there are still some problems in the use of the above device;

[0005] 1. Although the above device can change the supporting position of tunnels with different diameters during the supporting process, the lengths of the supporting rods at different positions may be different after the above supporting mechanism is adjusted. The supporting rods with different lengths are subjected to different squeezing forces, which makes the firmness of the above device relatively poor.

[0006] 2. After the support rods are installed, as the tunnel is continuously used, strain may occur at a certain point, causing the pressure at that point to change. If the point is not handled in time, the tunnel may deform over time, and in severe cases, collapse may occur. Summary of the invention

[0007] The embodiment of the present invention provides an assembled adjustable subway tunnel section support frame to solve the existing technical problems. The technical solution of the present invention aims at the technical problem that the existing technical solution is too single, and provides a solution that is significantly different from the existing technology.

[0008] The embodiment of the present invention adopts the following technical solution: an assembled adjustable subway tunnel section support frame, including a main body and a length adjustment mechanism, wherein the length adjustment mechanism is arranged in the main body, a plurality of support mechanisms are arranged outside the length adjustment mechanism, and a plurality of pressure adjustment mechanisms are arranged on the top of the support mechanism. The main body includes a support frame, and the support frames are assembled and connected to each other. A plurality of connecting frames are arranged outside the support frame, and each of the connecting frames is hingedly connected to the support frame.

[0009] Furthermore, the length adjustment mechanism includes a circular ring, which is arranged through the supporting frame, and a first rack is arranged outside the circular ring, and a plurality of adjustment components are arranged outside the first rack.

[0010] Furthermore, the adjustment assembly includes a gear, which is arranged on the outside of the first rack, and the second rack and the third rack are respectively arranged on both sides of the gear, the second rack and the third rack are connected by a matching frame, an extrusion rod is arranged on one side of the matching frame, the contact surface between the extrusion rod and the matching frame is an inclined surface, and a return spring is arranged on one side of the matching frame.

[0011] Furthermore, the support mechanism connecting seat is arranged at the top of the matching frame, and a plurality of mounting grooves are arranged at the bottom of the connecting seat, the mounting grooves are located on one side of the matching frame, each mounting groove is provided with a corresponding return spring, and sliding grooves are arranged on both sides of the connecting seat, and the sliding grooves are slidably connected to the end of the connecting frame, and a first support plate and a second support plate are respectively arranged on the top of the connecting seat, and the connecting seat is of a hollow design.

[0012] Furthermore, outer surfaces of the first support plate and the second support plate are both arc surfaces, and the first support plate and the second support plate are slidably connected to each other.

[0013] Furthermore, the pressure regulating mechanism includes an ejector, which is arranged in a connecting seat, and an axial force device is arranged on one side of the ejector, a hydraulic box is arranged on the outside of the axial force device, a floating cover plate is arranged on the top of the hydraulic box, a plurality of extrusion blocks are arranged on the top of the floating cover plate, and the plurality of extrusion blocks are connected to the top of the axial force device, a connecting block is arranged below the hydraulic box, a connecting pipe is arranged through the bottom surface of the hydraulic box, a moving block is slidably arranged at the lower end of the connecting pipe, and a connecting plate is arranged on the bottom surface of the moving block.

[0014] Furthermore, the connecting plate contacts the top end of the pressing rod, and the ejector cooperates with the pressing rod to form a jack.

[0015] Furthermore, the first rack is meshed with the gear, the gear is meshed with the second rack and the third rack, and when the second rack is meshed with the gear, the third rack is not meshed with the gear, and when the third rack is meshed with the gear, the second rack is not meshed with the gear.

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

[0017] Firstly, during use, the cooperation of the support mechanism and the length adjustment mechanism can effectively support tunnels of different diameters, and during the support process, the extended length of each support mechanism is equal, so that each support mechanism is subjected to the same extrusion force, thereby avoiding different extended lengths of the support mechanisms causing different extrusion forces on the support mechanisms, thereby causing a certain support mechanism to deform after long-term use, resulting in overall deformation and inability to effectively support the cross section. When in use, firstly, the support frame and the connecting frame are assembled and installed according to human habits. When the installation is completed, the support frame is in contact with the bottom surface and one side surface. At this time, the first rack is driven to rotate by the driving motor. When the first rack rotates, it drives the ring to rotate. When the ring rotates, it causes a number of gears arranged outside the first rack to rotate. When the gear rotates, the first rack connected to the gear is connected to the first rack. The two racks move outward under the action of the rotation of the gear. When the second rack moves, it will drive the connecting seat arranged at the top of the second rack and the first support plate and the second support plate arranged at the connecting end to move simultaneously. Since the multiple connecting seats are all meshed with the same first rack, the connecting seats at different positions move outward by the same distance. When a certain support plate first hits the inner wall of the tunnel, the support frame will be pushed to move under the action of force. In the continuous adjustment process, each support plate hits the inner wall of the tunnel at the same time, so that the device can automatically adjust the length of the support mechanism according to the size of different tunnels. In the adjustment process, since the moving distance of each support seat is the same, the force acting on each support seat will not change, so that the firmness of the device will not change after the adjustment, and the stability of the device is effectively guaranteed.

[0018] Secondly, a pressure regulating mechanism is provided during use. When the tunnel is deformed, the thrust can be increased by the jack to tighten the tunnel to prevent further deformation and damage. The deformation can also be restored to its original state by increasing the thrust. When a certain place is deformed, the pressure on the first support plate and the second support plate at that place changes. When the pressure changes, the axial force device arranged under the second support plate deforms under the action of pressure. When the axial force device is deformed, the hydraulic box is squeezed, so that the liquid in the hydraulic box is squeezed to the connecting pipe. At this time, the liquid pressure in the connecting pipe increases, so that the moving block arranged at the end of the connecting pipe moves downward. When the moving block moves downward, it will resist the pressing rod. When the pressing rod is squeezed, the liquid in the ejector will also change. Since the ejector is a jack structure, the height of the ejector will change. At this time, the resistance force on the first support plate arranged at the end of the ejector will increase, so that the thrust on the top of the tunnel can be increased, effectively preventing the deformation position here from continuing to deform and causing damage to the tunnel.

[0019] Thirdly, the extrusion force can be dispersed under the cooperation of the pressure adjustment mechanism and the length adjustment mechanism, thereby increasing the firmness of the device. When the axial force device is deformed, it will drive the extrusion rod to move downward synchronously. When the extrusion rod moves downward, it will contact the matching frame, causing the matching frame to shift, thereby driving the position of the second rack and the third rack arranged under the matching frame to change. The second rack originally connected to the gear is disconnected from the gear, and the third rack is connected to the gear. When the deformation point at this location has a deformation tendency, it will cause the support mechanism at this location to move downward. When the support mechanism has a downward tendency, it will cause the ring to have a rotation tendency. When the ring has a rotation tendency, the remaining support mechanisms connected to the ring will have a drive to move outward, so that the pressure at the deformation point will be dispersed to each of the remaining support mechanisms, thereby converting the downward pressure into a resistance force and transferring it back to the inner wall of the tunnel, thereby effectively increasing the firmness of the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0023] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0024] Figure 4 It is a schematic diagram of the length adjustment mechanism structure of the present invention;

[0025] Figure 5 It is a bottom schematic diagram of the length adjustment mechanism of the present invention;

[0026] Figure 6 It is a schematic diagram of the coordination structure of the pressure adjustment mechanism and the length adjustment mechanism of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the pressure regulating mechanism of the present invention.

[0028] Reference numerals:

[0029] 1. Main body; 11. Support frame; 12. Connecting frame; 2. Support mechanism; 21. First supporting plate; 22. Second supporting plate; 23. Connecting seat; 24. Slide groove; 25. Mounting groove; 3. Length adjustment mechanism; 31. Ring; 32. First rack; 33. Second rack; 34. Gear; 35. Third rack; 36. Extrusion rod; 37. Matching frame; 38. Return spring; 4. Pressure adjustment mechanism; 41. Ejector; 42. Axis force device; 43. Extrusion block; 44. Hydraulic box; 45. Connecting block; 46. Floating cover plate; 47. Connecting pipe; 48. Connecting plate; 49. Pressing rod. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0031] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0032] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Combine the following Figures 1 to 7 As shown, an embodiment of the present invention provides an assembled adjustable subway tunnel section support frame, including a main body 1 and a length adjustment mechanism 3, wherein the length adjustment mechanism 3 is arranged inside the main body 1, and a plurality of support mechanisms 2 are arranged outside the length adjustment mechanism 3, and a plurality of pressure adjustment mechanisms 4 are arranged on the top of the support mechanism 2, wherein the main body 1 includes a support frame 11, and the support frames 11 are assembled and connected to each other, and a plurality of connecting frames 12 are arranged outside the support frame 11, and each of the connecting frames 12 is hingedly connected to the support frame 11.

[0036] During operation, the length adjustment mechanism 3 can be adjusted to be used for tunnels of different diameters, and the length change of the support mechanism 2 at each location is made the same during the adjustment process, thereby effectively avoiding the different forces acting on the support mechanisms 2 at different locations due to different length changes, which may cause the support mechanisms 2 to deform after long-term use. When a certain point of the tunnel is deformed, more supporting force can be provided to the point under the action of the pressure adjustment mechanism 4, thereby effectively preventing the deformation of the point from worsening.

[0037] Specifically, the length adjustment mechanism 3 includes a circular ring 31 , which penetrates the support frame 11 , and a first rack 32 is disposed outside the circular ring 31 , and a plurality of adjustment components are disposed outside the first rack 32 .

[0038] Specifically, the adjustment assembly includes a gear 34, which is arranged on the outside of the first rack 32. The second rack 33 and the third rack 35 are respectively arranged on both sides of the gear 34. The second rack 33 and the third rack 35 are connected by a matching frame 37. An extrusion rod 36 is arranged on one side of the matching frame 37. The contact surface between the extrusion rod 36 and the matching frame 37 is an inclined surface, and a return spring 38 is arranged on one side of the matching frame 37.

[0039] Specifically, the support mechanism 2 is provided with a connecting seat 23, and the connecting seat 23 is arranged on the top of the matching frame 37, and a plurality of mounting grooves 25 are arranged at the bottom of the connecting seat 23, and the mounting grooves 25 are located on one side of the matching frame 37, and each mounting groove 25 is provided with a corresponding reset spring 38, and slide grooves 24 are arranged on both sides of the connecting seat 23, and the slide grooves 24 are slidably connected to the end of the connecting frame 12, and the top of the connecting seat 23 is respectively provided with a first support plate 21 and a second support plate 22, and the connecting seat 23 is of hollow design.

[0040] Specifically, outer surfaces of the first support plate 21 and the second support plate 22 are both arc surfaces, and the first support plate 21 and the second support plate 22 are slidably connected to each other.

[0041] During operation, the support frame 11 and the connecting frame 12 are assembled and installed according to human habits. When the installation is completed, the support frame 11 is in contact with the bottom surface and one side surface. At this time, the first rack 32 is driven to rotate by the driving motor. When the first rack 32 rotates, the ring 31 is driven to rotate. When the ring 31 rotates, a plurality of gears 34 arranged outside the first rack 32 are rotated. When the gear 34 rotates, the second rack 33 connected to the gear 34 moves outward under the action of the rotation of the gear 34. When the second rack 33 moves, the connecting seat 23 arranged at the top of the second rack 33 and the first support plate 21 and the second support plate 22 arranged at the connecting end are driven to move at the same time, and the Since a plurality of connecting seats 23 are all meshed with the same first rack 32, the connecting seats 23 at different positions move outwards by the same distance. When a support plate at a certain position first contacts the inner wall of the tunnel, the support frame 11 is pushed to move under the action of force. During the continuous adjustment process, each support plate contacts the inner wall of the tunnel at the same time, so that the device can automatically adjust the length of the support mechanism 2 according to the size of different tunnels. In addition, during the adjustment process, since the moving distance of each support seat is the same, the force acting on each support seat will not change, so that after the adjustment, the firmness of the device will not change, and the stability of the device is effectively guaranteed.

[0042] Specifically, the pressure regulating mechanism 4 includes an ejector 41, which is arranged in the connecting seat 23, and an axial force device 42 is arranged on one side of the ejector 41, a hydraulic box 44 is arranged on the outside of the axial force device 42, a floating cover plate 46 is arranged on the top of the hydraulic box 44, and a plurality of extrusion blocks 43 are arranged on the top of the floating cover plate 46, and the plurality of extrusion blocks 43 are connected to the top of the axial force device 42, a connecting block 45 is arranged below the hydraulic box 44, a connecting pipe 47 is arranged through the bottom surface of the hydraulic box 44, a moving block is slidably arranged at the lower end of the connecting pipe 47, and a connecting plate 48 is arranged on the bottom surface of the moving block.

[0043] Specifically, the connecting plate 48 contacts the top end of the pressing rod 49 , and the ejector 41 cooperates with the pressing rod 49 to form a jack.

[0044] Specifically, the first rack 32 is meshed with the gear 34, the gear 34 is meshed with the second rack 33 and the third rack 35, and when the second rack 33 is meshed with the gear 34, the third rack 35 is not meshed with the gear 34, and when the third rack 35 is meshed with the gear 34, the second rack 33 is not meshed with the gear 34.

[0045] During operation, when a certain place is deformed, the pressure on the first support plate 21 and the second support plate 22 at this place changes. When the pressure changes, the axial force device 42 arranged under the second support plate 22 is deformed under the action of pressure. When the axial force device 42 is deformed, it will squeeze the hydraulic box 44, so that the liquid in the hydraulic box 44 will be squeezed to the connecting pipe 47. At this time, the liquid pressure in the connecting pipe 47 increases, so that the moving block arranged at the end of the connecting pipe 47 moves downward. When the moving block moves downward, it will resist the pressing rod 49. When the pressing rod 49 is squeezed, the liquid in the ejector 41 will also change. Since the ejector 41 is a jack structure, the height of the ejector 41 will change. At this time, the resistance force on the first support plate 21 arranged at the end of the ejector 41 will increase, thereby increasing the thrust on the top of the tunnel, effectively preventing the deformation position here from continuing to deform and causing damage to the tunnel.

[0046] Working principle: First, assemble the support frame 11 and the connecting frame 12, and the support frame 11 and the connecting frame 12 are hingedly connected. When the connection is completed, make the support frame 11 contact with the bottom surface and one side surface. After contact, place the drive motor in a suitable position, connect a suitable drive tooth to the output end of the drive motor, wherein the drive tooth is meshed and connected with the first rack 32. When the drive motor drives the drive tooth to rotate, the drive tooth will drive the first rack 32 to rotate synchronously. When the first rack 32 rotates, it will drive the ring 31 to rotate. When the ring 31 rotates, it will cause several gears 34 arranged outside the first rack 32 to rotate. When the gear 34 rotates, the second rack 33 connected to the gear 34 rotates when the gear 34 rotates. When the second rack 33 moves, it will drive the connecting seat 23 set on the top of the second rack 33 and the first support plate 21 and the second support plate 22 set at the connecting end to move simultaneously, and because a plurality of connecting seats 23 are meshed with the same first rack 32, the connecting seats 23 at different positions move outward by the same distance. When a certain support plate first hits the inner wall of the tunnel, the support frame 11 will be pushed to move under the action of force. In the continuous adjustment process, each support plate hits the inner wall of the tunnel at the same time, so that the device can automatically adjust the length of the support mechanism 2 according to the size of different tunnels, and in the adjustment process, since the moving distance of each support seat is the same, each The force applied to each support seat will not change, so that the firmness of the device will not change after adjustment, effectively ensuring the stability of the device. When the support frame is installed, the tunnel may be deformed at a certain point. At this time, the pressure applied to the first support plate 21 and the second support plate 22 at this point will change. When the pressure applied changes, the axial force device 42 arranged under the second support plate 22 will be deformed under the action of pressure. When the axial force device 42 is deformed, it will squeeze the hydraulic box 44, so that the liquid in the hydraulic box 44 will be squeezed to the connecting pipe 47. At this time, the liquid pressure in the connecting pipe 47 increases, so that the moving block arranged at the end of the connecting pipe 47 moves downward. When the moving block moves downward, It will contact the pressing rod 49. When the pressing rod 49 is squeezed, the liquid in the ejector 41 will also change. Since the ejector 41 is a jack structure, the height of the ejector 41 will change. At this time, the first support plate 21 arranged at the end of the ejector 41 will be subject to an increased resistance force, thereby increasing the thrust on the top of the tunnel, effectively preventing the deformation position here from continuing to deform and causing damage to the tunnel. At the same time, when the axial force device 42 at this location is deformed, the axial force device 42 will drive the extrusion rod 36 to move downward synchronously. When the extrusion rod 36 moves downward, it will contact the matching frame 37, causing the matching frame 37 to move, thereby driving the positions of the second rack 33 and the third rack 35 arranged below the matching frame 37 to change.The second rack 33 originally connected to the gear 34 is disconnected from the gear 34, and the third rack 35 is connected to the gear 34. When the deformation site is deforming, the support mechanism 2 at that site will tend to move downward. When the support mechanism 2 has a downward trend, the ring 31 will have a rotation trend. When the ring 31 has a rotation trend, the remaining support mechanisms 2 connected to the ring 31 will be driven to move outward, so that the pressure at the deformation site will be dispersed to the remaining support mechanisms 2, thereby converting the downward pressure into a resistance force and transferring it back to the inner wall of the tunnel, thereby effectively increasing the firmness of the tunnel.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An assembled adjustable subway tunnel section support frame, comprising a main body (1), characterized in that: It also comprises a length adjustment mechanism (3), the length adjustment mechanism (3) being arranged in the body (1), a plurality of support mechanisms (2) being arranged outside the length adjustment mechanism (3), a plurality of pressure adjustment mechanisms (4) being arranged on the top of the support mechanisms (2), the body (1) comprising a support frame (11), the support frames (11) being connected by assembly, a plurality of connecting frames (12) being arranged outside the support frame (11), and each of the connecting frames (12) being connected to the support frame (11) by hinged connection; The length adjustment mechanism (3) comprises a circular ring (31), the circular ring (31) is arranged to penetrate the support frame (11), a first rack (32) is arranged outside the circular ring (31), and a plurality of adjustment components are arranged outside the first rack (32); The adjustment assembly comprises a gear (34), the gear (34) being arranged on the outer side of the first rack (32), a second rack (33) and a third rack (35) being arranged on both sides of the gear (34), the second rack (33) and the third rack (35) being connected via a matching frame (37), an extrusion rod (36) being arranged on one side of the matching frame (37), the contact surface between the extrusion rod (36) and the matching frame (37) being an inclined surface, and a return spring (38) being arranged on one side of the matching frame (37); The support mechanism (2) comprises a connecting seat (23), wherein the connecting seat (23) is arranged at the top of the matching frame (37), and a plurality of mounting grooves (25) are arranged at the bottom of the connecting seat (23), wherein the mounting grooves (25) are located at one side of the matching frame (37), and each mounting groove (25) is provided with a corresponding reset spring (38), and slide grooves (24) are arranged on both sides of the connecting seat (23), wherein the slide grooves (24) are slidably connected to the end of the connecting frame (12), and a first supporting plate (21) and a second supporting plate (22) are respectively arranged at the top of the connecting seat (23), and the connecting seat (23) is of hollow design.

2. The assembled adjustable subway tunnel section support frame according to claim 1 is characterized in that: The outer surfaces of the first support plate (21) and the second support plate (22) are both arc surfaces, and the first support plate (21) and the second support plate (22) are slidably connected to each other.

3. The assembled adjustable subway tunnel section support frame according to claim 1, characterized in that; The pressure regulating mechanism (4) comprises an ejector (41), the ejector (41) being arranged in a connecting seat (23), and an axial force device (42) being arranged on one side of the ejector (41), a hydraulic box (44) being arranged on the outer side of the axial force device (42), a floating cover plate (46) being arranged on the top of the hydraulic box (44), a plurality of extrusion blocks (43) being arranged on the top of the floating cover plate (46), and the plurality of extrusion blocks (43) being connected to the top of the axial force device (42), a connecting block (45) being arranged below the hydraulic box (44), a connecting pipe (47) being arranged through the bottom surface of the hydraulic box (44), a moving block being slidably arranged at the lower end of the connecting pipe (47), and a connecting plate (48) being arranged on the bottom surface of the moving block.

4. The assembled adjustable subway tunnel section support frame according to claim 3, characterized in that; The connecting plate (48) contacts the top end of the pressing rod (49), and the ejector (41) cooperates with the pressing rod (49) to form a jack.

5. The assembled adjustable subway tunnel section support frame according to claim 1, characterized in that; The first rack (32) is meshedly connected with the gear (34), the gear (34) is meshed with the second rack (33) and the third rack (35), and when the second rack (33) is meshed with the gear (34), the third rack (35) is not meshed with the gear (34), and when the third rack (35) is meshed with the gear (34), the second rack (33) is not meshed with the gear (34).

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