A telescopic adjustable inner support frame for large pipe diameter mechanical pipe jacking construction

Abstract

The application discloses a telescopic and adjustable inner support frame for large-pipe-diameter mechanical pipe jacking construction and relates to the field of mechanical pipe jacking construction.The telescopic and adjustable inner support frame for large-pipe-diameter mechanical pipe jacking construction comprises a threaded base support piece, the threaded base support piece is arranged in the interior of the mechanical pipe jacking, a threaded structure is arranged on the outer surface of the threaded base support piece, and a nested butt joint piece is nested and butt-jointed on the outer side of the threaded base support piece.The telescopic and adjustable inner support frame for large-pipe-diameter mechanical pipe jacking construction can be installed on mechanical pipe jacking with different pipe diameters, the nested butt joint rod is only needed to be moved inward, the first traction rope at the tail end can be cooperated with the outer positioning piece to stably drive the outer positioning piece to rotate outward, the outer positioning piece can be moved to abut against the inner wall of the corresponding pipeline, the operation demand of the subsequent self-locking auxiliary positioning can be met, the subsequent auxiliary supporting work can be carried out according to the differences of the inner diameters of different pipe fittings, and the loosening state can be avoided by cooperating with the linkage structure to carry out secondary supporting and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical pipe jacking construction, in particular to a telescopic adjustable internal support frame for large-diameter mechanical pipe jacking construction. BACKGROUND

[0002] In the process of building the environment, it is necessary to adapt to the installation of large-diameter mechanical pipe jacking, and its steel pipe size is large and the pipe wall is thin. In the process of construction, the corresponding adaptive internal support frame is needed to prevent the deformation of the large-diameter mechanical pipe jacking.

[0003] For example, a kind of adjustable internal support frame for preventing large-diameter steel pipe deformation with publication No. CN214989650U. Specifically includes center steel plate ring, radial support rod, threaded adjusting rod, adjusting device and magnetic suction anti-skid device;Center steel plate ring has weight-reducing circular hole in the middle;The one end of the plurality of radial support rods is fixedly connected with the center steel plate ring;The other end of the radial support rod is provided with adjusting groove;The one end of threaded adjusting rod is movably connected in the adjusting groove of radial support rod, and the other end of threaded adjusting rod is fixed with magnetic suction anti-skid device;Adjusting device is screw connected on the outer surface of threaded adjusting rod and abuts with the end of radial support rod. The utility model provides an adjustable internal support frame for preventing large-diameter steel pipe deformation;

[0004] For example, a kind of polytetrafluoroethylene pipe with internal support member with publication No. CN107883164A, the polytetrafluoroethylene pipe with internal support member includes outer pipe and inner pipe arranged in outer pipe, annular connecting sheet is provided along inner pipe radially outward, the inner side of annular connecting sheet is connected with inner pipe, and the outer side of annular connecting sheet is connected with outer pipe;The outer pipe is provided with anti-fake film assembly, and the anti-fake film assembly includes inner anti-fake film and outer anti-fake film which are both light-transmitting films;

[0005] The above-mentioned existing internal support frame mostly improves the performance of the whole, and the existing internal support frame for large-diameter mechanical pipe jacking construction has limited overall support range, cannot flexibly adjust the support work according to the equipment inside different pipe diameters, leads to limited overall application range, and the support point of the existing internal support frame for large-diameter mechanical pipe jacking construction is fixed, cannot stably carry out linkage type auxiliary positioning support treatment, leads to that the overall support strength cannot be guaranteed, and further has certain use limitation. SUMMARY

[0006] The present application aims to provide a telescopic adjustable inner support frame for large pipe diameter mechanical pipe jacking construction, to solve the problem that the overall performance of the existing inner support frame for large pipe diameter mechanical pipe jacking construction is improved, and the overall support range of the existing inner support frame for large pipe diameter mechanical pipe jacking construction is limited, which cannot be adjusted and supported flexibly according to the equipment inside different pipe diameters, resulting in limited overall application range, and the support point of the existing inner support frame for large pipe diameter mechanical pipe jacking construction is fixed, which cannot stably perform linkage type auxiliary positioning and supporting treatment, resulting in that the overall support strength cannot be guaranteed.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a telescopic adjustable inner support frame for large pipe diameter mechanical pipe jacking construction, comprising a threaded base support member, the threaded base support member is arranged inside the mechanical pipe jacking, and the outer surface of the threaded base support member is provided with a threaded structure;

[0008] The outer side of the threaded base support member is nested and connected with a nested connecting member, and the outer side of the nested connecting member is rotatably connected with a connecting support member, the end of the threaded base support member is connected with an auxiliary positioning member, and the outer side of the auxiliary positioning member is provided with a support positioning structure for positioning and guiding the auxiliary positioning member;

[0009] The outer side of the auxiliary positioning member is rotatably connected with a support abutting member, and the outer end of the support abutting member is rotatably connected with the end of the connecting support member, and the inner side of the connecting support member is provided with an auxiliary support structure for auxiliary supporting the inner side of the connecting support member;

[0010] The outer side of the support abutting member is provided with a secondary support structure for further guaranteeing the overall support strength.

[0011] Further, the support positioning structure is provided with a nested connecting rod, a torsion spring shaft, a containing cavity, an external positioning member, a first traction rope and a return spring;

[0012] The nested connecting rod is installed through the inside of the threaded base support member, the torsion spring shaft is connected through the outer side of the auxiliary positioning member, the external positioning member is fixedly connected to the outer side of the torsion spring shaft, the first traction rope is wound around the outer side of the torsion spring shaft, and the end of the first traction rope is connected with the outer side of the nested connecting rod, the containing cavity is arranged in the inside of the threaded base support member, and the return spring is wound around the nested connecting rod and the containing cavity, so that the nested connecting rod can be moved inward, and the external positioning member connected with the first traction rope at the end can be stably driven to rotate outward.

[0013] Further, the auxiliary support structure is provided with a first auxiliary air bag assembly, a support spring, a gas supply hose and a second auxiliary air bag assembly;

[0014] The first auxiliary air bag assembly is adhesively connected between the docking support and the support abutting piece, and the outer side of the first auxiliary air bag assembly is fixedly connected with a support spring, and the end of the support spring is in mutual docking with the outer side of the docking support, the outer side of the support abutting piece is adhesively connected with a second auxiliary air bag assembly, and the outer end of the second auxiliary air bag assembly penetrates a gas supply hose, and the gas supply hose is in mutual communication with the first auxiliary air bag assembly, and is transmitted to the second auxiliary air bag assembly through the gas supply hose, and cooperates with the secondary positioning piece to assist in supporting.

[0015] Further, the secondary supporting structure is provided with a second traction rope, a secondary positioning piece, a movable docking piece, a nested preset block, a docking pull rope, a movable shaft assembly and a torsion spring.

[0016] The shaft end of the support abutting piece is provided with a second traction rope, and the outer surface of the support abutting piece is rotatably connected with a movable docking piece, and the outer side of the movable docking piece is nested with a nested preset block, the outer side of the nested preset block is fixedly connected with a secondary positioning piece, and the outer end of the nested preset block is in docking with a docking pull rope, the inside of the movable docking piece penetrates a movable shaft assembly, and the end of the docking pull rope is in mutual docking with the movable shaft assembly, and the outer side of the movable shaft assembly is provided with a torsion spring.

[0017] Further, the nested docking rod forms a telescopic structure along the inside of the threaded base support through the reset spring, and the threaded base support forms a threaded rotating structure along the inner end of the auxiliary positioning piece.

[0018] Further, the outer positioning piece is equally angularly distributed about the center point of the threaded base support, and the outer positioning piece forms a traction structure with the nested docking rod through the first traction rope of the shaft end and the outward movement, and the length of the outer positioning piece is greater than the length of the support abutting piece.

[0019] Further, the support abutting piece forms a rotating structure through the displacement of the docking support, and the support abutting piece and the docking support are equally angularly distributed about the center point of the threaded base support, and the support abutting piece and the docking support form a pressing work on the first auxiliary air bag assembly when the angle of the support abutting piece and the docking support is active.

[0020] Further, the first auxiliary air bag assembly and the second auxiliary air bag assembly are both annular structures, and the first auxiliary air bag assembly forms a supply state with the second auxiliary air bag assembly through the gas supply hose.

[0021] Further, the secondary positioning member cooperates with the nested preset block of the spherical support structure to form a nested structure along the inner side of the movable abutting member, and the movable abutting member forms a traction structure with the shaft end of the support abutting member through the second traction rope, the movable abutting member forms a reset structure through the abutting pull rope, the movable shaft assembly and the torsion spring, and the nested preset block of the spherical support structure can ensure that the secondary positioning member adapts to the support requirements of the inner walls of different types of pipe fittings.

[0022] Compared with the prior art, the beneficial effects of the present application are:

[0023] 1. The telescopic adjustable inner support frame for large-diameter mechanical pipe jacking construction is provided with a support positioning structure, and during the installation process of adapting to mechanical pipe jacking of different pipe diameters, only the nested abutting rod needs to be moved inward, which can drive the externally positioned positioning member to rotate outward stably, so that it is moved to abut against the inner wall of the corresponding pipe, thereby meeting the operation requirements of subsequent self-locking auxiliary positioning, and the subsequent auxiliary support work can be carried out according to the different inner diameters of different pipe fittings, which can ensure the application range, and the linkage structure is cooperated to carry out secondary support, so that the loosening state is avoided.

[0024] 2. The telescopic adjustable inner support frame for large-diameter mechanical pipe jacking construction is provided with an auxiliary support structure, and after the externally positioned positioning member is preliminarily limited, only the threaded base support member needs to be rotated to drive the nested abutting member on the outside to move inward and push the three groups of abutting support members inward, so that the abutting support member is moved outward until it abuts against the inside of the corresponding pipe to support, and the support abutting member with an included angle synchronously presses the first auxiliary air bag assembly at the inner end, so that the first auxiliary air bag assembly is transmitted to the second auxiliary air bag assembly through the air supply hose, and the subsequent movable secondary positioning member is cooperated to carry out auxiliary support, so as to further strengthen the negative pressure support force of the whole device when supporting in the pipe of different diameters, and to stably ensure the form during the transportation construction in the pipe with thin texture, so that adverse phenomena such as deformation do not easily occur.

[0025] 3. The telescopic adjustable inner support frame for large-diameter mechanical pipe jacking construction is provided with a secondary support structure, and as the first auxiliary air bag assembly is pressed to supply air to the inside of the second auxiliary air bag assembly, the second auxiliary air bag assembly in the expanded state will push the secondary positioning member to move upward, and the angularly movable support abutting member will drive the movable abutting member and the secondary positioning member to stably abut against the pipe inside through the second traction rope at the shaft end to carry out secondary support, and the nested preset block of the spherical support structure can ensure that the secondary positioning member adapts to the support requirements of the inner walls of different types of pipe fittings, thereby improving the application range of the whole device. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1Schematic diagram of the three-dimensional structure of the present application;

[0027] Figure 2 Schematic diagram of the three-dimensional structure of the first auxiliary air bag assembly of the present application;

[0028] Figure 3 Schematic diagram of the three-dimensional structure of the second auxiliary air bag assembly of the present application;

[0029] Figure 4 Schematic diagram of the three-dimensional structure of the docking support of the present application;

[0030] Figure 5 Schematic diagram of the side view structure of the present application;

[0031] Figure 6 Schematic diagram of the semi-partial three-dimensional structure of the first auxiliary air bag assembly of the present application;

[0032] Figure 7 Schematic diagram of the partial enlarged structure of the present application Figure 6

[0033] Figure 8 Schematic diagram of the side view structure of the present application;

[0034] In the figure: 1, threaded base support; 2, nested docking piece; 3, docking support; 4, auxiliary positioning piece; 5, nested docking rod; 6, torsion spring shaft; 7, accommodating cavity; 8, external positioning piece; 9, first traction rope; 10, return spring; 11, support contact piece; 12, first auxiliary air bag assembly; 13, support spring; 14, air supply hose; 15, second auxiliary air bag assembly; 16, second traction rope; 17, secondary positioning piece; 18, movable docking piece; 19, nested preset block; 20, docking pull rope; 21, movable shaft assembly; 22, torsion spring. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] Please refer to Figures 1-8 ​The application provides a technical scheme: a telescopic adjusting inner support frame for large-pipe-diameter mechanical pipe jacking construction, which comprises a threaded base support 1, a nested butt joint 2, a butt joint support 3, an auxiliary positioning part 4, a nested butt joint rod 5, a torsion spring shaft 6, a containing cavity 7, an external positioning part 8, a first traction rope 9, a reset spring 10, a support contact part 11, a first auxiliary air bag assembly 12, a support spring 13, a gas supply hose 14, a second auxiliary air bag assembly 15, a second traction rope 16, a secondary positioning part 17, a movable butt joint 18, a nested preset block 19, a butt joint pull rope 20, a movable shaft assembly 21 and a torsion spring 22.

[0037] In the first embodiment,

[0038] The threaded base support 1 is arranged in the interior of the mechanical pipe jacking, and the outer surface of the threaded base support 1 is provided with a threaded structure.

[0039] The threaded base support 1 is nested with the nested butt joint 2 on the outer side, the outer side of the nested butt joint 2 is rotationally connected with the butt joint support 3, the end of the threaded base support 1 is connected with the auxiliary positioning part 4, and the outer side of the auxiliary positioning part 4 is provided with a support positioning structure for positioning and guiding the auxiliary positioning part 4.

[0040] The outer side of the auxiliary positioning part 4 is rotationally connected with the support contact part 11, and the outer end of the support contact part 11 is rotationally connected with the end of the butt joint support 3, the inner side of the butt joint support 3 is provided with an auxiliary support structure for auxiliary supporting the inner side of the butt joint support 3.

[0041] The outer side of the support contact part 11 is provided with a secondary support structure for further ensuring the support strength of the whole.

[0042] The support positioning structure is provided with the nested butt joint rod 5, the torsion spring shaft 6, the containing cavity 7, the external positioning part 8, the first traction rope 9 and the reset spring 10, the nested butt joint rod 5 is installed through the interior of the threaded base support 1, the torsion spring shaft 6 is connected through the butt joint on the outer side of the auxiliary positioning part 4, the outer side of the torsion spring shaft 6 is fixedly connected with the external positioning part 8, the outer side of the torsion spring shaft 6 is provided with the first traction rope 9, the end of the first traction rope 9 is connected with the outer side of the nested butt joint rod 5, the containing cavity 7 is formed in the interior of the threaded base support 1, and the reset spring 10 is arranged between the containing cavity 7 and the nested butt joint rod 5. The nested butt joint rod 5 forms a telescopic structure along the interior of the threaded base support 1 through the reset spring 10, and the threaded base support 1 forms a threaded rotation structure along the inner end of the auxiliary positioning part 4. The external positioning part 8 is distributed at equal angles about the center point of the threaded base support 1, forms a traction structure with the outward nested butt joint rod 5 through the first traction rope 9 of the shaft end, and the length of the external positioning part 8 is greater than that of the support contact part 11.

[0043] The auxiliary support structure is provided with a first auxiliary air bag assembly 12, a support spring 13, a gas supply hose 14 and a second auxiliary air bag assembly 15; the first auxiliary air bag assembly 12 is adhesively connected between the butt joint support 3 and the support abutting piece 11, and the outer side of the first auxiliary air bag assembly 12 is fixedly connected with the support spring 13, and the end of the support spring 13 is mutually butted with the outer side of the butt joint support 3; the outer side of the support abutting piece 11 is adhesively connected with the second auxiliary air bag assembly 15, and the outer end of the second auxiliary air bag assembly 15 is penetratedly installed with the gas supply hose 14, and the gas supply hose 14 is mutually communicated with the first auxiliary air bag assembly 12. The support abutting piece 11 forms a rotating structure through the displacement of the butt joint support 3, and the support abutting piece 11 and the butt joint support 3 are equiangularly distributed about the center point of the threaded base support 1, and the support abutting piece 11 and the butt joint support 3 form a pressure bonding work on the inner end of the first auxiliary air bag assembly 12 when the angle of the support abutting piece 11 and the butt joint support 3 is changed. The first auxiliary air bag assembly 12 and the second auxiliary air bag assembly 15 are both annular structures, and the first auxiliary air bag assembly 12 forms a supply state through the gas supply hose 14 and the second auxiliary air bag assembly 15.

[0044] In the process of installing the mechanical pipe jacking device adapted to different pipe diameters, only the nested butt joint rod 5 is moved inward, and the outer positioning piece 8 is stably driven to rotate outward through the first traction rope 9 butted at the end, so that it is moved to abut and position the inner wall of the corresponding pipe, and the subsequent self-locking auxiliary positioning operation requirement is met. The subsequent auxiliary support work is carried out in advance according to the different inner diameters of different pipes. After the preliminary limiting is carried out through the outer positioning piece 8, only the threaded base support 1 is rotated to drive the nested butt joint piece 2 outside to move inward, so as to cooperate with the support abutting piece 11 to move outward until it is abutted and supported in the corresponding pipe, and the support abutting piece 11 and the butt joint support 3 form an included angle to synchronously press the first auxiliary air bag assembly 12 at the inner end, so as to transmit it to the second auxiliary air bag assembly 15 through the gas supply hose 14, cooperate with the subsequent movable secondary positioning piece 17 to carry out auxiliary support, and further strengthen the negative pressure support force of the whole device when it is adapted to support the inside of the pipe jacking device with different pipe diameters, so as to stably ensure the form of the pipe with thin texture during the transfer construction process, and the deformation and other adverse phenomena will not easily occur.

[0045] In the second embodiment:

[0046] The secondary supporting structure is provided with a second traction rope 16, a secondary positioning piece 17, a movable butt joint piece 18, a nested preset block 19, a butt joint pull rope 20, a movable shaft assembly 21 and a torsion spring 22; the shaft end of the supporting butt piece 11 is provided with the second traction rope 16, and the outer surface of the supporting butt piece 11 is rotationally connected with the movable butt joint piece 18, the outer side of the movable butt joint piece 18 is nested with the nested preset block 19, the outer side of the nested preset block 19 is fixedly connected with the secondary positioning piece 17, the outer end of the nested preset block 19 is butt jointed with the butt joint pull rope 20, the inside of the movable butt joint piece 18 is penetratedly installed with the movable shaft assembly 21, and the movable shaft assembly 21 and the end of the butt joint pull rope 20 are mutually butt jointed, and the outer side of the movable shaft assembly 21 is provided with the torsion spring 22. The secondary positioning piece 17 cooperates with the spherical nested preset block 19 to form a nested structure along the inside of the movable butt joint piece 18, and the movable butt joint piece 18 forms a traction structure with the shaft end of the supporting butt piece 11 through the second traction rope 16, and forms a reset structure among the butt joint pull rope 20, the movable shaft assembly 21 and the torsion spring 22;

[0047] When the first auxiliary air bag assembly 12 is compressed to supply air to the inside of the second auxiliary air bag assembly 15, the second auxiliary air bag assembly 15 in the inflation state will push the secondary positioning piece 17 to move upward, and the angularly movable supporting butt piece 11 will drive the movable butt joint piece 18 and the secondary positioning piece 17 to stably move upward to the inside of the pipe through the second traction rope 16 at the shaft end, and the nested preset block 19 of the spherical supporting structure can ensure that the secondary positioning piece 17 adapts to the supporting requirements of the inner walls of pipes of different types.

[0048] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A telescopic adjustable inner support frame for large pipe diameter mechanical pipe jacking construction, comprising a threaded base support (1) arranged inside the mechanical pipe jacking, and a threaded structure is arranged on the outer surface of the threaded base support (1); characterized in that A nested butt joint (2) is nested and butt jointed on the outer side of the threaded base support (1), and a butt joint support (3) is rotatably connected to the outer side of the nested butt joint (2), an auxiliary positioning member (4) is butt jointed to the end of the threaded base support (1), and a support positioning structure is arranged on the outer side of the auxiliary positioning member (4) for positioning and guiding the auxiliary positioning member (4); A support abutting member (11) is rotatably connected to the outer side of the auxiliary positioning member (4), and the outer end of the support abutting member (11) is rotatably butt jointed to the end of the butt joint support (3), and an auxiliary support structure is arranged on the inner side of the butt joint support (3) for auxiliary support on the inner side of the butt joint support (3); A secondary support structure is arranged on the outer side of the support abutting member (11) to further ensure the support strength of the whole; The support positioning structure is provided with a nested butt joint rod (5), a torsion spring shaft (6), a containing cavity (7), an external positioning member (8), a first traction rope (9), and a reset spring (10); The nested butt joint rod (5) is installed through the inside of the threaded base support (1), the torsion spring shaft (6) is butt jointed through the outer side of the auxiliary positioning member (4), the external positioning member (8) is fixedly connected to the outer side of the torsion spring shaft (6), the first traction rope (9) is arranged around the outer side of the torsion spring shaft (6), the end of the first traction rope (9) is mutually butt jointed with the outer side of the nested butt joint rod (5), the containing cavity (7) is arranged in the inside of the threaded base support (1), and the reset spring (10) is arranged around the nested butt joint rod (5) and the containing cavity (7); The auxiliary support structure is provided with a first auxiliary air bag assembly (12), a support spring (13), a gas supply hose (14), and a second auxiliary air bag assembly (15); The first auxiliary air bag assembly (12) is adhesively connected between the butt joint support (3) and the support abutting member (11), the support spring (13) is fixedly connected to the outer side of the first auxiliary air bag assembly (12), the end of the support spring (13) is mutually butt jointed with the outer side of the butt joint support (3), the second auxiliary air bag assembly (15) is adhesively connected to the outer side of the support abutting member (11), the gas supply hose (14) is installed through the outer end of the second auxiliary air bag assembly (15), and the gas supply hose (14) is in communication with the first auxiliary air bag assembly (12); The secondary support structure is provided with a second traction rope (16), a secondary positioning member (17), a movable butt joint member (18), a nested preset block (19), a butt joint pull rope (20), a movable shaft assembly (21), and a torsion spring (22); The shaft end of the supporting abutting piece (11) is provided with a second traction rope (16), and the outer surface of the supporting abutting piece (11) is rotationally connected with a movable abutting piece (18), and the outer side of the movable abutting piece (18) is nested with a nested preset block (19), the outer side of the nested preset block (19) is fixedly connected with a secondary positioning piece (17), and the outer end of the nested preset block (19) is connected with an abutting pull rope (20), the inside of the movable abutting piece (18) is penetrated with a movable shaft assembly (21), and the movable shaft assembly (21) and the end of the abutting pull rope (20) are mutually connected, and the outer side of the movable shaft assembly (21) is provided with a torsion spring (22).

2. The telescopic adjustable inner support frame for large pipe diameter mechanical pipe jacking construction according to claim 1, characterized in that: The nested abutting rod (5) is formed into a telescopic structure along the inside of the threaded base support (1) through the reset spring (10), and the threaded base support (1) is formed into a threaded rotating structure along the inner end of the auxiliary positioning piece (4).

3. The telescopic adjustable inner support frame for large pipe diameter mechanical pipe jacking construction according to claim 2, characterized in that: The external positioning piece (8) is equally angularly distributed about the center point of the threaded base support (1), and the external positioning piece (8) forms a traction structure with the nested abutting rod (5) that moves outward through the first traction rope (9) of the shaft end, and the length of the external positioning piece (8) is greater than the length of the supporting abutting piece (11).

4. The telescopic adjustable inner support frame for large pipe diameter mechanical pipe jacking construction according to claim 3, characterized in that: The supporting abutting piece (11) forms a rotating structure through the displaced abutting support (3), and the supporting abutting piece (11) and the abutting support (3) are equally angularly distributed about the center point of the threaded base support (1), and the supporting abutting piece (11) and the abutting support (3) form a pressing work on the first auxiliary air bag assembly (12) at the inner end when they are angularly movable.

5. The telescopic adjustable inner support frame for large pipe diameter mechanical pipe jacking construction according to claim 4, characterized in that: The first auxiliary air bag assembly (12) and the second auxiliary air bag assembly (15) are both annular structures, and the first auxiliary air bag assembly (12) forms a supply state with the second auxiliary air bag assembly (15) through the gas supply hose (14).

6. The telescopic adjustable inner support frame for large pipe diameter mechanical pipe jacking construction according to claim 5, characterized in that: The secondary positioning piece (17) cooperates with the spherical nested preset block (19) to form a nested structure along the inside of the movable abutting piece (18), and the movable abutting piece (18) forms a traction structure with the shaft end of the supporting abutting piece (11) through the second traction rope (16), and the movable abutting piece (18) forms a reset structure among the abutting pull rope (20), the movable shaft assembly (21) and the torsion spring (22).

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