Portal ring frame structure for occluded pipe jacking construction and occluded pipe jacking construction method

Abstract

The invention relates to the technical field of tunnel engineering, in particular to a tunnel portal ring frame structure for occluded pipe jacking construction and an occluded pipe jacking construction method.The tunnel portal ring frame structure comprises a pre-buried ring frame and a post-mounted ring frame detachably connected with the pre-buried ring frame; the pre-embedded ring frame comprises a first pre-embedded ring frame and a second pre-embedded ring frame, the first pre-embedded ring frame and the second pre-embedded ring frame are both of open ring structures, and one opening of the first pre-embedded ring frame is in butt joint with one opening of the second pre-embedded ring frame; the post-installed ring frame comprises a first post-installed ring frame and a second post-installed ring frame, wherein the first post-installed ring frame is used for being matched with the first pre-buried ring frame to form a closed ring frame so as to conduct pre-construction pipe jacking construction, and the second post-installed ring frame is used for being matched with the second pre-buried ring frame to form a closed ring frame so as to conduct post-construction pipe jacking construction. When the portal ring frame structure is used for occluded pipe jacking construction, a corresponding closed ring frame can be formed during construction of each jacking pipe, the requirement for pressure conversion of an excavation tunnel face of the jacking pipe, especially a muddy water jacking pipe, is met, and the problem that an existing embedded ring frame cannot be closed to form a ring during occluded pipe jacking construction is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering, and in particular to a tunnel portal ring frame structure used for bite-joint jacking construction and a bite-joint jacking construction method. Background Art

[0002] With the continuous advancement of urbanization in my country, the number of large-span shallow buried tunnels is increasing, and there are more and more cases of tunnels passing under railways, roads, subway stations and other structures, which places higher and higher requirements on the settlement control of tunnel construction. Therefore, a dark-cut tunnel construction method with annular pre-excavation and advanced support cycle is proposed. Multiple jacking machines arranged along the annular direction of the tunnel are used to excavate the tunnel pre-support structure, and the excavation contours of adjacent jacking machine cutters are overlapped and interlocked.

[0003] When the jacking pipe is started, a closed cylindrical steel ring frame should be formed as much as possible. The ring frame is a steel cylinder structure that is concentric with the steel shell of the jacking pipe. An oil plate root roller is installed in the gap between the cylinder and the jacking pipe cylinder to form a closed space between the jacking pipe cutter head and the ring frame. Later, temporary water-stopping devices such as rubber plates and steel sleeves can be installed on the ring frame for jacking pipe construction. The embedded ring frame structure is widely used in starting and receiving devices such as shield and jacking pipes. However, in the construction of interlocking jacking pipes, one jacking pipe is constructed first, and then the adjacent jacking pipes are constructed. The two jacking pipes are overlapped, so the embedded ring frames on the end walls of the starting and receiving working shafts have the problem of not being able to be closed into a ring. Summary of the invention

[0004] The object of the present invention is to provide a tunnel door ring frame structure and a method for interlocking jacking construction, which can at least solve some of the defects in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is a portal ring frame structure for bite-in jacking construction, comprising a pre-embedded ring frame and a post-installed ring frame detachably connected to the pre-embedded ring frame; the pre-embedded ring frame comprises a first pre-embedded ring frame and a second pre-embedded ring frame, both of which are open annular structures, and an opening of the first pre-embedded ring frame is docked with an opening of the second pre-embedded ring frame; the post-installed ring frame comprises a first post-installed ring frame for cooperating with the first pre-embedded ring frame to form a closed ring frame for post-construction jacking construction, and a second post-installed ring frame for cooperating with the second pre-embedded ring frame to form a closed ring frame for post-construction jacking construction.

[0006] As one of the implementation modes, the first post-installed ring frame is installed in the opening of the first pre-embedded ring frame, and fixing plates are provided at both ends of the outer arc surface of the first post-installed ring frame, and the fixing plates are detachably connected to the second pre-embedded ring frame.

[0007] As one of the implementation modes, the arc length of the first post-installed ring frame is smaller than the opening arc length of the first pre-embedded ring frame.

[0008] As one of the implementation modes, a first sealing material is provided between the end surface of the first post-installed ring frame and the opening end surface of the first embedded ring frame.

[0009] As one of the implementation modes, during the jacking construction, a first sealing plate is provided on the jacking pipe surface of the first sealing material, and both ends of the first sealing plate extend to the inner side surface of the first embedded ring frame and the inner arc surface of the first post-installed ring frame respectively.

[0010] As one of the implementation modes, a sealing gasket is provided between the fixing plate and the second embedded ring frame.

[0011] As one of the implementation modes, the length of the first rear-mounted ring frame along the jacking direction is smaller than the thickness of the end wall of the working pit, and a second sealing material is provided between the first rear-mounted ring frame and the jacking pipe excavation surface.

[0012] As one of the implementation modes, a second sealing plate is provided on the top pipe surface of the second sealing material, and two ends of the second sealing plate extend to the inner side surface of the first rear-mounted ring frame and the top pipe excavation surface respectively.

[0013] As one of the implementation modes, the second post-installed ring frame has the same structure as the first post-installed ring frame, except that during the post-construction pipe jacking construction, the second post-installed ring frame is installed in the opening of the second embedded ring frame, and the fixing plates at both ends of the second post-installed ring frame are detachably connected to the first embedded ring frame.

[0014] The present invention also provides a method for interlocking pipe jacking construction, which adopts the above-mentioned tunnel door ring frame structure, and the method comprises the following steps:

[0015] S1. Pre-embed the pre-embedded ring frame in the end wall of the working pit;

[0016] S2, installing the rear-mounted ring frame at a preset position;

[0017] S3, dismantling the second post-installed ring frame in the excavation range of the first construction jacking pipe, so that the first post-installed ring frame and the first pre-buried ring frame are enclosed to form a closed ring frame, and the construction of the first construction jacking pipe is carried out;

[0018] S4, dismantling the first rear-mounted ring frame within the jacking range of the rear construction pipe, installing the second rear-mounted ring frame, so that the second rear-mounted ring frame and the second pre-buried ring frame are enclosed to form a closed ring frame, and then carrying out the construction of the rear construction pipe.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) When the portal ring frame structure of the present invention is used for interlocking pipe jacking construction, the pre-buried ring frame can be pre-buried in the end wall of the working pit during the main structure construction of the working pit, and the corresponding post-installed ring frame can be removed or installed according to construction needs. When the first construction pipe jacking construction is carried out, the first post-installed ring frame and the first pre-buried ring frame form a closed ring frame. When the second construction pipe jacking construction is carried out, the first post-installed ring frame within the pushing range of the second construction pipe jacking is removed, and the second post-installed ring frame and the second pre-buried ring frame are installed to form a closed ring frame, so that a corresponding closed ring frame can be formed during the construction of each pipe jacking, meeting the requirements for pressure conversion of the excavation face of the pipe jacking, especially the mud and water pipe jacking, and effectively solving the problem that the existing pre-buried ring frame cannot be closed into a ring during interlocking pipe jacking construction;

[0021] (2) During the pipe jacking construction, the corresponding rear-mounted ring frame is fixed on the adjacent pre-buried ring frame, which does not affect the pipe jacking construction. A certain gap is reserved between the rear-mounted ring frame and the adjacent pre-buried ring frame, and a sealing gasket is provided to adapt to the structural construction error;

[0022] (3) Sealing materials are provided at the joints between the rear-mounted ring frame and the corresponding pre-buried ring frame and between the rear-mounted ring frame and the excavation surface of the jacking pipe, and the joints are sealed by sealing plates to form a relatively sealed space for the jacking pipe, thereby meeting the anti-seepage requirements of groundwater and mud in muddy water jacking pipe construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the construction of the bite-jointed jacking pipe provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of a tunnel door ring frame structure provided by an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the connection between the pre-buried ring frame and the post-installed ring frame provided in an embodiment of the present invention;

[0027] Figure 4 A large-scale diagram of the connection between the first pre-embedded ring frame and the first post-installed ring frame provided in an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the closed surface of the rear-mounted ring frame and the top pipe excavation surface provided by an embodiment of the present invention;

[0029] In the figure: 1. Construct the jacking pipe first; 2. Construct the jacking pipe later; 3. Pre-buried ring frame; 3-1. First pre-buried ring frame; 3-2. Second pre-buried ring frame; 4. Post-installed ring frame; 4-1. First post-installed ring frame; 4-2. Second post-installed ring frame; 5-1. First fixing plate; 5-2. Second fixing plate; 6. Fixing bolts; 7. Sealing gasket; 8. First sealing plate; 9. First sealing material; 10. Second sealing plate; 11. Second sealing material; 12. Outline of jacking pipe excavation; 13. jacking pipe excavation surface. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position 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 a limitation on the present invention.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] like Figure 1-Figure 2 As shown, this embodiment provides a portal ring frame structure for bite-jointed jacking construction, including a pre-embedded ring frame 3 and a post-installed ring frame 4 detachably connected to the pre-embedded ring frame 3; the pre-embedded ring frame 3 includes a first pre-embedded ring frame 3-1 and a second pre-embedded ring frame 3-2, both of which are open annular structures, and an opening of the first pre-embedded ring frame 3-1 is docked with an opening of the second pre-embedded ring frame 3-2; the post-installed ring frame 4 includes a first post-installed ring frame 4-1 used to cooperate with the first pre-embedded ring frame 3-1 to form a closed ring frame for the first construction jacking construction 1 construction and a second post-installed ring frame 4-2 used to cooperate with the second pre-embedded ring frame 3-2 to form a closed ring frame for the post-construction jacking construction 2 construction.

[0034] When the portal ring frame structure of the present embodiment is used for interlocking jacking construction, the embedded ring frame 3 can be embedded in the end wall of the working well during the main structure construction of the working well, and the corresponding post-installed ring frame 4 can be removed or installed according to construction needs. When the first construction jacking pipe 1 is constructed, the first post-installed ring frame 4-1 and the first embedded ring frame 3-1 form a closed ring frame. When the post-construction jacking pipe 2 is constructed, the first post-installed ring frame 4-1 within the jacking range of the post-construction jacking pipe 2 is removed, and the second post-installed ring frame 4-2 is installed to form a closed ring frame with the second embedded ring frame 3-2, so that a corresponding closed ring frame can be formed during the construction of each jacking pipe, meeting the requirements for pressure conversion of the excavation face of the jacking pipe, especially the mud and water jacking pipe, and effectively solving the problem that the existing embedded ring frame 3 cannot be closed into a ring during interlocking jacking construction.

[0035] When the first construction jacking pipe 1 has the later construction jacking pipe 2 on only one side, the first embedded ring frame 3-1 has the second embedded ring frame 3-2 on only one side, the first embedded ring frame 3-1 has an opening and is connected with the opening of the second embedded ring frame 3-2 on one side. When the first construction jacking pipe 1 is constructed, the first later installation ring frame 4-1 and the first embedded ring frame 3-1 form a closed ring frame. When the later construction jacking pipe 2 is constructed, the first later installation ring frame 4-1 in the pushing range of the later construction jacking pipe 2 is removed, and the second later installation ring frame 4-2 is installed to form a closed ring frame with the second embedded ring frame 3-2.

[0036] When both sides of the first construction jacking pipe 1 have the subsequent construction jacking pipe 2, such as Figure 1 and Figure 2 As shown, there are second embedded ring frames 3-2 on both sides of the first embedded ring frame 3-1, and the first embedded ring frame 3-1 has two openings on the left and the right, the opening on the left is connected to the opening of the second embedded ring frame 3-2 on the left, and the opening on the right is connected to the opening of the second embedded ring frame 3-2 on the right; when the first construction jacking pipe 1 is constructed, the first rear-mounted ring frame 4-1 is installed in the openings on both sides of the first embedded ring frame 3-1 to form a closed ring frame; when the rear construction jacking pipe 2 is constructed, the first rear-mounted ring frame 4-1 within its jacking range is removed, and the second rear-mounted ring frame 4-2 is installed to form a closed ring frame with the second embedded ring frame 3-2.

[0037] In some embodiments, the first post-installed ring frame 4-1 is installed in the opening of the first pre-embedded ring frame 3-1, and first fixing plates 5-1 are provided at both ends of the outer arc surface of the first post-installed ring frame 4-1, and the first fixing plates 5-1 are detachably connected to the second pre-embedded ring frame 3-2. Figure 2-Figure 3As shown, the first post-installed ring frame 4-1 and the first embedded ring frame 3-1 are on the same circumference, so as to form a complete ring frame with the same center as the pipe jacking machine before the construction of the first construction jacking pipe 1, and the first post-installed ring frame 4-1 is detachably fixed to the adjacent second embedded ring frame 3-2 through the first fixing plates 5-1 at both ends, so as to avoid affecting the construction of the first construction jacking pipe 1 and facilitate extraction and removal; the detachable fixing can be achieved by fixing bolts 6 and the like, and the first fixing plate 5-1 can be a steel plate. Optimally, the first fixing plate 5-1 of the first post-installed ring frame 4-1 is arc-shaped, and has the same arc as the second embedded ring frame 3-2, so as to more reliably fix the first fixing plate 5-1 to the second embedded ring frame 3-2.

[0038] In this embodiment, the arc length of the first post-installed ring frame 4-1 is smaller than the arc length of the opening of the first pre-embedded ring frame 3-1. In order to adapt to the processing and installation errors of the first pre-embedded ring frame 3-1 and the first post-installed ring frame 4-1, the arc length of the first post-installed ring frame 4-1 is designed in this embodiment to be slightly smaller than the arc length of the opening of the first pre-embedded ring frame 3-1, so as to ensure that the first post-installed ring frame 4-1 can be smoothly installed in the opening of the first pre-embedded ring frame 3-1.

[0039] Furthermore, a first sealing material 9 is provided between the end surface of the first post-installed ring frame 4-1 and the opening end surface of the first embedded ring frame 3-1. Figure 4 As shown, the gaps between the two end faces of the first post-installed ring frame 4-1 and the two end faces of the opening of the first embedded ring frame 3-1 are sealed by the first sealing material 9 to ensure the formation of a complete closed ring frame structure. The first sealing material 9 can be sponge rubber or polysulfide sealant.

[0040] Furthermore, when the jacking pipe 1 is constructed, the first sealing material 9 is provided with a first sealing plate 8 on the jacking pipe surface, and the two ends of the first sealing plate 8 extend to the inner side surface of the first embedded ring frame 3-1 and the inner arc surface of the first post-installed ring frame 4-1 respectively. Figure 4 As shown, in this embodiment, the first sealing plate 8 is pasted and fixed on the top pipe surface of the first sealing material 9, and the two ends of the first sealing plate 8 are respectively extended and pasted on the inner side surface of the first embedded ring frame 3-1 and the inner arc surface of the first rear mounted ring frame 4-1 to seal the joint, which can be pressed tightly under the action of external water pressure to ensure the sealing effect of the top pipe construction. Among them, the first sealing plate 8 can be a rubber plate.

[0041] In some embodiments, a sealing gasket 7 is provided between the first fixing plate 5-1 and the second embedded ring frame 3-2. In this embodiment, the first fixing plate 5-1 of the first post-mounted ring frame 4-1 is detachably connected to the second embedded ring frame 3-2 by fixing bolts 6, and a sealing gasket 7 is provided between the first fixing plate 5-1 and the second embedded ring frame 3-2, which can not only adapt to construction errors, but also improve the sealing performance of the connection. Specifically, the sealing gasket 7 can be a rubber gasket, and the size is consistent with the size of the first fixing plate 5-1.

[0042] In some embodiments, the length of the first rear-mounted ring frame 4-1 along the jacking direction is less than the thickness of the end wall of the working pit, and a second sealing material 11 is provided between the first rear-mounted ring frame 4-1 and the jacking excavation surface 13. Figure 5 As shown, in this embodiment, the length of the first rear-mounted ring frame 4-1 along the jacking direction is less than the thickness of the end wall to eliminate the influence of the ring frame processing and installation errors on the construction. At the same time, when the jacking pipe 1 is constructed first, the second sealing material 11 is filled in the gap between the first rear-mounted ring frame 4-1 and the jacking pipe excavation surface 13 to ensure the end sealing effect. Among them, the second sealing material 11 can be made of sponge rubber or polysulfide sealant.

[0043] Furthermore, the second sealing material 11 is provided with a second sealing plate 10 on the top pipe surface, and the two ends of the second sealing plate 10 extend to the inner side surface of the first rear mounting ring frame 4-1 and the top pipe excavation surface 13 respectively. Figure 5 As shown, in this embodiment, the second sealing plate 10 is pasted and fixed on the top pipe surface of the second sealing material 11, and the two ends of the second sealing plate 10 are respectively extended and pasted on the inner side surface of the first rear mounting ring frame 4-1 and the top pipe excavation surface 13 to seal the joint, which can be pressed tightly under the action of external water pressure to ensure the sealing effect of the top pipe construction. Among them, the second sealing plate 10 can be a rubber plate.

[0044] In this embodiment, the second post-installed ring frame 4-2 has the same structure as the first post-installed ring frame 4-1, except that during the post-construction jacking pipe 2, the second post-installed ring frame 4-2 is installed in the opening of the second pre-embedded ring frame 3-2, and the second post-installed ring frame 4-2 is provided with a second fixing plate 5-2 at both ends, and the second fixing plates 5-2 at both ends are detachably connected to the first pre-embedded ring frame 3-1. Specifically, during the post-construction jacking pipe 2, the second post-installed ring frame 4-2 and the second pre-embedded ring frame 3-2 are on the same circumference and form a complete ring frame with the same center as the pipe jacking machine.

[0045] Further, the node between the second post-installed ring frame 4-2 and the second embedded ring frame 3-2 is the same as the node structure between the first post-installed ring frame 4-1 and the first embedded ring frame 3-1. Specifically, the arc length of the second post-installed ring frame 4-2 is less than the opening arc length of the second embedded ring frame 3-2. A first sealing material 9 is provided between the end face of the second post-installed ring frame 4-2 and the opening end face of the second embedded ring frame 3-2. In some embodiments, a sealing gasket 7 is provided between the second fixed plate 5-2 and the first embedded ring frame 3-1. The length of the second post-installed ring frame 4-2 along the jacking direction is less than the thickness of the end wall, and when the post-construction jacking pipe 2 is constructed, a second sealing material 11 is provided between the second post-installed ring frame 4-2 and the jacking pipe excavation surface 13, and a first sealing plate 8 is provided on the jacking pipe surface of the first sealing material 9.

[0046] This embodiment also provides a method for construction of a bite-jointed jacking pipe, which adopts the above-mentioned tunnel door ring frame structure, and the method comprises the following steps:

[0047] S1. Pre-embed the pre-embedded ring frame 3 in the end wall of the working pit; specifically, when constructing the main structure of the working pit, install the pre-embedded ring frame 3 at the designed position of the end wall and fix it with anchor bars or the like;

[0048] S2, installing the rear ring frame 4 at a preset position;

[0049] S3, dismantle the second post-installed ring frame 4-2 in the excavation range of the first construction jacking pipe 1, so that the first post-installed ring frame 4-1 and the first pre-buried ring frame 3-1 are enclosed to form a closed ring frame, and the construction of the first construction jacking pipe 1 is carried out; before the construction of the first construction jacking pipe 1, dismantle the post-installed ring frame 4 of the adjacent jacking pipe in its jacking range;

[0050] S4, dismantle the first rear-mounted ring frame 4-1 within the jacking range of the rear construction jacking pipe 2, install the second rear-mounted ring frame 4-2, so that the second rear-mounted ring frame 4-2 and the second embedded ring frame 3-2 are enclosed to form a closed ring frame, and then carry out the construction of the rear construction jacking pipe 2.

[0051] During the subsequent pipe jacking construction, according to the above method, the rear-mounted ring frame 4 of the adjacent pipe jacking range is first removed, and then the rear-mounted ring frame 4 corresponding to the construction pipe jacking is installed to form a closed cylindrical structure that meets the requirements of the pipe jacking construction, and then the pipe jacking construction is carried out.

[0052] In this embodiment, the rear-mounted ring frame 4 in the jacking range is removed before the jacking, and the corresponding rear-mounted ring frame 4 is installed to achieve complete closure of the tunnel door ring frame when the jacking starts and receives, meeting the requirements of the front and rear jacking construction in the bite area

[0053] The portal ring frame structure and construction method of this embodiment can be installed in the starting working shaft for starting construction with engaging jacking pipes; it can also be installed in the receiving working shaft for arriving construction with engaging jacking pipes.

[0054] The above description is only a description of the basic principles of the present invention, and does not limit the structure of the present invention to any specific shape, size, layout, excavation method, or material. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tunnel door ring frame structure for bite-jointed pipe jacking construction, characterized in that: It comprises a pre-embedded ring frame and a post-installed ring frame detachably connected to the pre-embedded ring frame; the pre-embedded ring frame comprises a first pre-embedded ring frame and a second pre-embedded ring frame, both of which are open annular structures, and an opening of the first pre-embedded ring frame is docked with an opening of the second pre-embedded ring frame; the post-installed ring frame comprises a first post-installed ring frame used to cooperate with the first pre-embedded ring frame to form a closed ring frame for first-construction jacking construction, and a second post-installed ring frame used to cooperate with the second pre-embedded ring frame to form a closed ring frame for post-construction jacking construction.

2. The door ring frame structure according to claim 1, characterized in that: The first post-installed ring frame is installed in the opening of the first pre-embedded ring frame, and fixing plates are provided at both ends of the outer arc surface of the first post-installed ring frame, and the fixing plates are detachably connected to the second pre-embedded ring frame.

3. The door ring frame structure according to claim 2, characterized in that: The arc length of the first post-installed ring frame is smaller than the opening arc length of the first pre-embedded ring frame.

4. The door ring frame structure according to claim 3, characterized in that: A first sealing material is arranged between the end surface of the first post-installed ring frame and the opening end surface of the first embedded ring frame.

5. The door ring frame structure according to claim 4, characterized in that: During the pipe jacking construction, a first sealing plate is provided on the pipe jacking surface of the first sealing material, and two ends of the first sealing plate extend to the inner side surface of the first embedded ring frame and the inner arc surface of the first post-installed ring frame respectively.

6. The door ring frame structure according to claim 2, characterized in that: A sealing gasket is arranged between the fixing plate and the second embedded ring frame.

7. The door ring frame structure according to claim 2, characterized in that: The length of the first rear-mounted ring frame along the jacking direction is less than the thickness of the end wall of the working pit, and a second sealing material is arranged between the first rear-mounted ring frame and the jacking pipe excavation surface.

8. The door ring frame structure according to claim 7, characterized in that: The top pipe surface of the second sealing material is provided with a second sealing plate, and the two ends of the second sealing plate extend to the inner side surface of the first rear-mounted ring frame and the top pipe excavation surface respectively.

9. The tunnel door ring frame structure according to any one of claims 2 to 8, characterized in that: The second post-installed ring frame has the same structure as the first post-installed ring frame, except that during post-construction pipe jacking construction, the second post-installed ring frame is installed in the opening of the second embedded ring frame, and the fixing plates at both ends of the second post-installed ring frame are detachably connected to the first embedded ring frame.

10. A method for construction of a bite-jointed pipe jacking, characterized in that: Using the tunnel door ring frame structure according to any one of claims 1 to 9, the method comprises the following steps: S1. Pre-embed the pre-embedded ring frame in the end wall of the working pit; S2, installing the rear-mounted ring frame at a preset position; S3, dismantling the second post-installed ring frame in the excavation range of the first construction jacking pipe, so that the first post-installed ring frame and the first pre-buried ring frame are enclosed to form a closed ring frame, and the construction of the first construction jacking pipe is carried out; S4, dismantling the first rear-mounted ring frame within the jacking range of the rear construction pipe, installing the second rear-mounted ring frame, so that the second rear-mounted ring frame and the second pre-buried ring frame are enclosed to form a closed ring frame, and then carrying out the construction of the rear construction pipe.

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