Secondary lining formwork system for underground excavation engineering

Abstract

The invention relates to the technical field of underground excavation construction, and discloses a secondary lining formwork supporting system for underground excavation engineering, which comprises a support main body and a plurality of hydraulic formwork supporting structures, the support main body is used for being arranged in a primary support pilot tunnel and is distributed with the inner wall of a primary support at intervals, and the plurality of hydraulic formwork supporting structures are arranged on the support main body around the inner wall of the primary support at intervals in the circumferential direction; the hydraulic formwork supporting structure comprises a hydraulic jacking column, a jacking support, a segmented formwork and an extension driver, one end of the hydraulic jacking column is detachably connected with the support body, and the jacking support is installed at the other end of the hydraulic jacking column; the segmented formworks are hinged to the outer sides of the jacking supports, the stretching drivers are connected between the hydraulic jacking columns and the segmented formworks, and the segmented formworks of the hydraulic formwork supporting structures are distributed in the circumferential direction to form a secondary lining formwork structure when the hydraulic formwork supporting structures are in the unfolding position. A force transmission bracket is detachably installed on the side, away from the hydraulic jacking column, of the jacking support, the force transmission bracket is matched with the inner wall of the primary support in a supporting mode, a spoiler is further fixed to the force transmission bracket, and the spoiler and the end face of the jacking support are arranged in a spaced mode.

Description

Technical Field

[0001] The invention relates to the technical field of underground excavation construction, in particular to a secondary lining formwork system for underground underground excavation engineering. Background Art

[0002] In underground engineering construction, the use of dark excavation can reduce the impact on the surrounding ground. Figure 1 As shown, before the construction of the secondary lining of the dark excavation, the middle partition wall 10a of the primary support 1a needs to be removed. There is a force conversion in this process. Improper construction may cause a large deformation of the primary support and even cause an accident.

[0003] There are two main types of treatment solutions for the primary support of the intermediate partition before the secondary lining construction: (i) Figure 2 As shown, before the construction of the secondary lining 2a, the middle partition wall is removed in sections. The conventional length of each section of the middle partition wall is 6 to 8 meters. The load borne by the middle partition wall is transferred to the primary support 1a. It is only suitable for dark excavation projects with good geology and small excavation size. Figure 3 As shown, before the construction of the secondary lining 2a, the middle partition wall is dismantled in steps, that is, one partition is dismantled, one partition is dismantled, and two partitions are dismantled, etc. After the concrete layer of the middle partition wall 10a is chiseled off, the steel grid or steel arch frame is poured into the secondary lining concrete structure. This construction method can ensure the stability of the primary support during the construction stage of the secondary lining when the middle partition wall is dismantled, but the waterproof layer between the primary support 1a and the secondary lining 2a cannot be completely closed at the middle partition wall 10a, resulting in a waterproof weak point at the middle partition wall 10a.

[0004] In summary, in the existing technology of dark excavation secondary lining construction, it is difficult to ensure the stable force conversion when the primary support middle partition is removed, and the continuous closure of the waterproof layer cannot be guaranteed after the secondary lining construction, and the safety and waterproof performance of dark excavation construction are poor. Summary of the invention

[0005] The technical problem to be solved by the present invention is that in the prior art of dark excavation secondary lining construction, it is difficult to ensure the stable force conversion when the primary support middle partition is removed, and the continuous closure of the waterproof layer cannot be guaranteed after the secondary lining is constructed, and the safety and waterproof performance of the dark excavation construction are poor.

[0006] In order to solve the above technical problems, the present invention provides a technical solution for a secondary lining formwork system for underground tunneling engineering:

[0007] The secondary lining formwork system of underground tunnel engineering includes a support body and a plurality of hydraulic formwork structures, wherein the support body is used to be arranged in the primary support guide hole and is spaced apart from the inner wall of the primary support, and the plurality of hydraulic formwork structures are spaced apart and arranged on the support body around the inner wall of the primary support in a circumferential direction;

[0008] The hydraulic formwork structure comprises a hydraulic jack, a jacking support, a segmented formwork and an extension driver, one end of the hydraulic jack is detachably connected to the support body, and the jacking support is installed at the other end of the hydraulic jack;

[0009] The segmented template is hingedly connected to the outer side of the jacking support, the extension driver is connected between the hydraulic jack and the segmented template, and the segmented template has an unfolded position away from the support body and a retracted position close to the support body;

[0010] In the deployed position, a plurality of segmented templates of the hydraulic formwork structure are circumferentially distributed to form a secondary lining template structure, and the secondary lining template structure is arranged around the outside of the cross-sectional profile of the support body;

[0011] A force transmission corbel is detachably mounted on one side of the jacking support away from the hydraulic jacking column. The force transmission corbel is used to cooperate with the inner wall support of the primary support. A spoiler is also fixed on the force transmission corbel. The spoiler is spaced apart from the end face of the jacking support.

[0012] Furthermore, the support body includes a plurality of support longitudinal beams, the plurality of support longitudinal beams are spaced apart and parallel to the length direction of the primary support, and at least two groups of the plurality of hydraulic formwork structures are spaced apart along the extension direction of the support longitudinal beams.

[0013] Further, the bracket longitudinal beams are provided with five, which are respectively an upper bracket longitudinal beam, two middle bracket longitudinal beams and two lower bracket longitudinal beams, the upper bracket longitudinal beam is arranged on the middle upper side of the two middle bracket longitudinal beams, and the two lower bracket longitudinal beams are arranged correspondingly on the lower sides of the two middle bracket longitudinal beams;

[0014] Reinforcement beams are fixedly connected between the upper support longitudinal beam and the two middle support longitudinal beams, between the middle support longitudinal beam and the lower support longitudinal beam, between the two middle support longitudinal beams, and between the two lower support longitudinal beams.

[0015] Furthermore, the hydraulic formwork structures are provided with five, namely, an upper hydraulic formwork structure, an upper corner hydraulic formwork structure, a middle side hydraulic formwork structure, a lower side hydraulic formwork structure, and a lower corner hydraulic formwork structure. The upper hydraulic formwork structure is installed on the upper support longitudinal beam, the upper corner hydraulic formwork structure and the middle side hydraulic formwork structure are both installed on the middle side support longitudinal beam, and the lower side hydraulic formwork structure and the lower corner hydraulic formwork structure are both installed on the lower side support longitudinal beam.

[0016] Furthermore, the hydraulic top column of the upper hydraulic formwork structure is vertically extended on the upper support longitudinal beam, the hydraulic top column of the upper corner hydraulic formwork structure is vertically extended on the middle support longitudinal beam, the hydraulic top column of the middle hydraulic formwork structure is horizontally extended on the middle support longitudinal beam, the hydraulic top column of the lower hydraulic formwork structure is horizontally extended on the lower support longitudinal beam, and the hydraulic top column of the lower corner hydraulic formwork structure is vertically extended on the lower support longitudinal beam.

[0017] Furthermore, the upper support longitudinal beam and the two middle support longitudinal beams are distributed in a shape of a triangle in the cross section of the support body, and a T-shaped reinforcing beam is detachably connected between the upper support longitudinal beam and the two middle support longitudinal beams.

[0018] Furthermore, the jacking support is hingedly mounted on the end of the hydraulic jacking column, and the hinge axis of the jacking support is arranged parallel to the length direction of the bracket body.

[0019] Furthermore, the top pressure support is located outside the hydraulic top column and is provided with two segmented templates. When in the expanded position, the two segmented templates and the top pressure support are connected to form a second lining template segment that matches the inner contour of the primary support.

[0020] Furthermore, the lower corner hydraulic formwork structure also includes a bottom formwork, one side of which is hingedly connected to the edge of the segmented formwork of the lower corner hydraulic formwork structure, and a bottom drive is also connected between the bottom formwork and the segmented formwork of the lower corner hydraulic formwork structure.

[0021] Furthermore, the force-transmitting corbel includes two end plates, a web and a rib plate, the two end plates are arranged in parallel and spaced apart, the web and the rib plate are fixedly connected between the two end plates, the spoiler is fixedly connected to the web at a position between the two end plates, and the spoiler protrudes from the outer contour of the two end plates, and one end plate is detachably connected to the top pressure support with a fastening bolt.

[0022] Compared with the prior art, the secondary lining formwork system of an underground tunnel project of the present invention has the following beneficial effects: the secondary lining formwork system of the underground tunnel project adopts a design form of a support body and multiple hydraulic formwork structures, the support body is used to be set in the primary support guide hole and is distributed with the inner wall of the primary support, and the multiple hydraulic formwork structures are arranged on the support body at circumferential intervals around the inner wall of the primary support. The support body is used to construct an installation foundation for the multiple hydraulic formwork structures that are distributed at circumferential intervals, so that the multiple hydraulic formwork structures can provide complete circumferential support for the inner wall of the primary support.

[0023] The hydraulic formwork structure includes a hydraulic jack, a jacking support, a segmented formwork and an extension driver. One end of the hydraulic jack is detachably connected to the support body, and the jacking support is installed at the other end of the hydraulic jack. A force transmission bracket is detachably installed on the side of the jacking support away from the hydraulic jack. The hydraulic jack can drive the jacking support and the force transmission bracket to extend outward, so that the force transmission bracket can support and cooperate with the inner wall of the primary support. A reliable internal support force is formed from the support body, the hydraulic jack, the jacking support to the force transmission bracket, ensuring stable force conversion when removing the middle partition wall.

[0024] Among them, the segmented formwork is hingedly connected to the outside of the top pressure support, and the extension driver is connected between the hydraulic top column and the segmented formwork. When the force transmission corbel is in place, the segmented formwork of the hydraulic formwork structure can be controlled to expand. In the expanded position, the segmented formwork of multiple hydraulic formwork structures are circumferentially distributed to form a secondary lining formwork structure. The secondary lining formwork structure is arranged around the outside of the cross-sectional profile of the support body, and concrete can be poured into the cavity between the secondary lining formwork structure and the primary support. After the construction of this section of the secondary lining is completed, the segmented formwork of the hydraulic formwork structure can be controlled to be retracted. In the retracted position, the segmented formwork is separated from the secondary lining to complete the work.

[0025] In addition, before the construction of the secondary lining, a waterproof layer is first pasted on the inner wall of the primary support. Since the force-transmitting corbels cause the force conversion of the middle partition wall, the waterproof layer here can be applied after the middle partition wall is removed, so that the waterproof layer of the primary support and the waterproof layer at the middle partition wall can be connected to form a complete closure. Moreover, a spoiler is fixed on the force-transmitting corbels, and the spoiler is arranged at intervals with the end face of the top pressure support. Since there are force-transmitting corbels inside the cast secondary lining, the spoiler can prevent water seepage along the force-transmitting corbels, thereby effectively improving the safety and waterproof performance of the dark excavation construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional schematic diagram of an underground tunneling project before the secondary lining construction in the background technology;

[0027] Figure 2 It is a cross-sectional schematic diagram of a first solution for treating a middle partition wall of an underground tunneling project in the background technology;

[0028] Figure 3 It is a cross-sectional schematic diagram of a second solution for treating a middle partition wall of an underground tunneling project in the background technology;

[0029] Figure 4 It is a cross-sectional schematic diagram of a secondary lining formwork system (when the segmented formwork is omitted) for underground tunneling engineering in an embodiment of the present invention;

[0030] Figure 5 It is a cross-sectional schematic diagram of a secondary lining formwork system (when the segmented formwork is unfolded) for underground tunneling engineering in an embodiment of the present invention;

[0031] Figure 6 1 is a schematic structural diagram of an upper hydraulic formwork structure (from an extended position to a retracted position) according to an embodiment of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the upper corner hydraulic formwork structure and the middle side hydraulic formwork structure (from the extended position to the retracted position) of an embodiment of the present invention;

[0033] Figure 8 1 is a schematic structural diagram of a lower hydraulic formwork structure and a lower corner hydraulic formwork structure (from an extended position to a retracted position) according to an embodiment of the present invention;

[0034] Fig. 9 2 is a schematic structural diagram of a force transmission bracket according to an embodiment of the present invention;

[0035] Figures 1 to 3 Middle: 1a-primary support, 10a-middle septum, 2a-secondary lining;

[0036] Figures 4 to 9 Middle: 1-primary support, 10-middle partition, 2-support body, 20-support longitudinal beam, 21-upper support longitudinal beam, 22-middle side support longitudinal beam, 23-lower side support longitudinal beam, 24-reinforcement beam, 240-T-shaped reinforcement beam, 3-hydraulic formwork structure, 30-force transmission bracket, 300-spoiler, 301-hydraulic jacking column, 302-top pressure support, 303-segmented formwork, 304-extension drive, 305-bottom formwork, 306-bottom drive, 307-end plate, 308-web plate, 309-rib plate, 31-upper hydraulic formwork structure, 32-upper corner hydraulic formwork structure, 33-middle side hydraulic formwork structure, 34-lower side hydraulic formwork structure, 35-lower corner hydraulic formwork structure. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0039] In addition, 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, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] like Figures 4 to 9 As shown, a secondary lining formwork system for underground tunnel engineering according to an embodiment of the present invention comprises a support body 2 and a plurality of hydraulic formwork structures 3, wherein the support body 2 is used to be arranged in a guide hole of a primary support 1 and is spaced apart from the inner wall of the primary support 1, and the plurality of hydraulic formwork structures 3 are spaced apart and arranged on the support body 2 around the inner wall of the primary support 1 in a circumferential direction; the hydraulic formwork structure 3 comprises a hydraulic jack 301, a jacking support 302, a segmented formwork 303 and an extension driver 304, one end of the hydraulic jack 301 is detachably connected to the support body 2, and the jacking support 302 is installed on the other end of the hydraulic jack 301.

[0042] The segmented formwork 303 is hingedly connected to the outer side of the jacking support 302, and the extension driver 304 is connected between the hydraulic jacking column 301 and the segmented formwork 303. The segmented formwork 303 has an expanded position away from the support body 2 and a retracted position close to the support body 2. In the expanded position, the segmented formwork 303 of multiple hydraulic formwork structures 3 are circumferentially distributed to form a second lining formwork structure, and the second lining formwork structure is arranged around the outer side of the cross-sectional contour of the support body 2.

[0043] A force transmission bracket 30 is detachably mounted on one side of the top pressure support 302 away from the hydraulic top column 301 . The force transmission bracket 30 is used to cooperate with the inner wall support of the primary support 1 . A spoiler 300 is also fixed on the force transmission bracket 30 . The spoiler 300 is spaced apart from the end face of the top pressure support 302 .

[0044] The secondary lining formwork system of the underground tunnel project adopts a design form of a support body 2 and multiple hydraulic formwork structures 3. The support body 2 is used to be set in the guide hole of the primary support 1 and is spaced apart from the inner wall of the primary support 1. The multiple hydraulic formwork structures 3 are arranged on the support body 2 at circumferential intervals around the inner wall of the primary support 1. The support body 2 is used to construct an installation foundation for the multiple hydraulic formwork structures 3 at circumferential intervals, so that the multiple hydraulic formwork structures 3 can provide complete circumferential support for the inner wall of the primary support 1.

[0045] The hydraulic formwork structure 3 includes a hydraulic jack 301, a jacking support 302, a segmented formwork 303 and an extension driver 304. One end of the hydraulic jack 301 is detachably connected to the support body 2, and the jacking support 302 is installed on the other end of the hydraulic jack 301. A force transmission bracket 30 is detachably installed on the side of the jacking support 302 away from the hydraulic jack 301. The hydraulic jack 301 can drive the jacking support 302 and the force transmission bracket 30 to extend outward, so that the force transmission bracket 30 and the inner wall of the primary support 1 are supported and matched, and a reliable internal support force is formed from the support body 2, the hydraulic jack 301, the jacking support 302 to the force transmission bracket 30, ensuring the stable force conversion when the middle partition wall 10 is removed.

[0046] Among them, the segmented formwork 303 is hingedly connected to the outside of the top pressure support 302, and the extension driver 304 is connected between the hydraulic top column 301 and the segmented formwork 303. When the force transmission corbel 30 is supported in place, the segmented formwork 303 of the hydraulic formwork structure 3 can be controlled to expand. When in the expanded position, the segmented formwork 303 of the multiple hydraulic formwork structures 3 are circumferentially distributed to form a secondary lining formwork structure. The secondary lining formwork structure is arranged around the outside of the cross-sectional profile of the support body 2, and concrete can be poured into the cavity between the secondary lining formwork structure and the primary support 1. After the construction of this section of the secondary lining is completed, the segmented formwork 303 of the hydraulic formwork structure 3 can be controlled to be retracted. When in the retracted position, the segmented formwork 303 is separated from the secondary lining and the work is completed.

[0047] In addition, before the construction of the secondary lining, a waterproof layer is first pasted on the inner wall of the primary support 1. Since the force transmission corbel 30 causes the force conversion of the middle partition wall 10, the waterproof layer here can be applied after the middle partition wall 10 is removed, so that the waterproof layer of the primary support 1 can be connected with the waterproof layer at the middle partition wall 10 to form a complete closure. Moreover, a spoiler 300 is fixed on the force transmission corbel 30, and the spoiler 300 is arranged at intervals with the end surface of the top pressure support 302. Since the force transmission corbel 30 exists inside the cast secondary lining, the spoiler 300 can prevent water seepage along the force transmission corbel 30, thereby effectively improving the safety and waterproof performance of the dark excavation construction.

[0048] In this embodiment, the support body 2 includes a plurality of support longitudinal beams 20, which are spaced apart in parallel to the length direction of the primary support 1, and a plurality of hydraulic formwork structures 3 are spaced apart in at least two groups along the extension direction of the support longitudinal beams 20. Specifically, there are five support longitudinal beams 20, which are an upper support longitudinal beam 21, two middle support longitudinal beams 22, and two lower support longitudinal beams 23. The upper support longitudinal beam 21 is arranged at the middle upper side of the two middle support longitudinal beams 22, and the two lower support longitudinal beams 23 are correspondingly arranged at the lower side of the two middle support longitudinal beams 22; reinforcing beams 24 are fixedly connected between the upper support longitudinal beam 21 and the two middle support longitudinal beams 22, between the middle support longitudinal beam 22 and the lower support longitudinal beam 23, between the two middle support longitudinal beams 22, and between the two lower support longitudinal beams 23.

[0049] The support body 2 is designed with five support longitudinal beams 20, which can provide more comprehensive installation fulcrums for the hydraulic formwork structure 3 in the circumferential direction. The reinforcing beam 24 is fixedly connected between the five support longitudinal beams 20 to ensure the structural integrity of the support body 2. There are five hydraulic formwork structures 3, which are the upper hydraulic formwork structure 31, the upper corner hydraulic formwork structure 32, the middle side hydraulic formwork structure 33, the lower side hydraulic formwork structure 34, and the lower corner hydraulic formwork structure 35. The upper hydraulic formwork structure 31 is installed on the upper support longitudinal beam 21, the upper corner hydraulic formwork structure 32 and the middle side hydraulic formwork structure 33 are both installed on the middle side support longitudinal beam 22, and the lower side hydraulic formwork structure 34 and the lower corner hydraulic formwork structure 35 are both installed on the lower side support longitudinal beam 23.

[0050] It should be noted that the drawings in this embodiment are about double-side wall guide holes, and the two-lining formwork system can also be applied to other forms of dark excavation end faces. Regarding the number of support longitudinal beams 20, five support longitudinal beams 20 are designed for double-side wall guide holes. In other embodiments, for dark excavation methods such as CRD and CD, the number of support longitudinal beams can be adaptively adjusted and flexibly installed.

[0051] Specifically, the hydraulic top column 301 of the upper hydraulic formwork structure 31 is vertically extended and arranged on the upper support longitudinal beam 21, the hydraulic top column 301 of the upper corner hydraulic formwork structure 32 is vertically extended and arranged on the middle side support longitudinal beam 22, the hydraulic top column 301 of the middle side hydraulic formwork structure 33 is horizontally extended and arranged on the middle side support longitudinal beam 22, the hydraulic top column 301 of the lower side hydraulic formwork structure 34 is horizontally extended and arranged on the lower side support longitudinal beam 23, and the hydraulic top column 301 of the lower corner hydraulic formwork structure 35 is vertically extended and arranged on the lower side support longitudinal beam 23.

[0052] The upper hydraulic formwork structure 31 and the upper corner hydraulic formwork structure 32 generate an upward supporting force through the segmented formwork 303, the middle side hydraulic formwork structure 33 and the lower side hydraulic formwork structure 34 generate a lateral supporting force through the segmented formwork 303, and the lower corner hydraulic formwork structure 35 generates a downward supporting force through the segmented formwork 303. In addition, the upper support longitudinal beam 21 and the two middle side support longitudinal beams 22 are distributed in a triangular shape in the cross section of the support body 2, and a T-shaped reinforcing beam 240 is detachably connected between the upper support longitudinal beam 21 and the two middle side support longitudinal beams 22, which can improve the force reliability of the upper support longitudinal beam 21.

[0053] In this embodiment, the top pressure support 302 is hingedly installed at the end of the hydraulic top column 301, and the hinge axis of the top pressure support 302 is arranged parallel to the length direction of the support body 2. In addition, the top pressure support 302 is located on the outside of the hydraulic top column 301 and is provided with two segmented templates 303. When in the unfolded position, the two segmented templates 303 and the top pressure support 302 are connected to form a second lining template segment matching the inner contour of the primary support 1.

[0054] The lower corner hydraulic formwork structure 35 further includes a bottom formwork 305, one side of which is hingedly connected to the edge of the segmented formwork 303 of the lower corner hydraulic formwork structure 35, and a bottom driver 306 is further connected between the bottom formwork 305 and the segmented formwork 303 of the lower corner hydraulic formwork structure 35. The bottom formwork 305 is used to expand the support area of ​​the segmented formwork 303 of the lower corner hydraulic formwork structure 35, thereby ensuring the circumferential integrity of the secondary lining formwork structure.

[0055] In addition, the force transmission bracket 30 includes two end plates 307, a web 308 and a rib 309, the two end plates 307 are arranged in parallel and spaced apart, the web 308 and the rib 309 are fixedly connected between the two end plates 307, the spoiler 300 is fixedly connected to the web 308 between the two end plates 307, and the spoiler 300 is arranged protruding from the outer contour of the two end plates 307, and one end plate 307 is detachably connected to the top pressure support 302 with a fastening bolt. The web 308 and the rib 309 strengthen the force transmission bracket 30, ensure the ability of the support to resist deformation under force, and use the fastening bolts to fix the force transmission bracket 30 and the top pressure support 302, which is convenient for disassembly and assembly.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A secondary lining formwork system for underground tunneling engineering, characterized in that: It comprises a support body and a plurality of hydraulic formwork structures, wherein the support body is used to be arranged in the primary support guide hole and spaced apart from the inner wall of the primary support, and the plurality of hydraulic formwork structures are spaced apart and arranged on the support body in a circumferential direction around the inner wall of the primary support; The hydraulic formwork structure comprises a hydraulic jack, a jacking support, a segmented formwork and an extension driver, one end of the hydraulic jack is detachably connected to the support body, and the jacking support is installed at the other end of the hydraulic jack; The segmented template is hingedly connected to the outer side of the jacking support, the extension driver is connected between the hydraulic jack and the segmented template, and the segmented template has an unfolded position away from the support body and a retracted position close to the support body; In the deployed position, a plurality of segmented templates of the hydraulic formwork structure are circumferentially distributed to form a secondary lining template structure, and the secondary lining template structure is arranged around the outside of the cross-sectional profile of the support body; A force transmission corbel is detachably mounted on one side of the jacking support away from the hydraulic jacking column. The force transmission corbel is used to cooperate with the inner wall support of the primary support. A spoiler is also fixed on the force transmission corbel. The spoiler is spaced apart from the end face of the jacking support.

2. The secondary lining formwork system for underground tunneling engineering according to claim 1 is characterized in that: The support body includes a plurality of support longitudinal beams, the plurality of support longitudinal beams are spaced apart and parallel to the length direction of the primary support, and at least two groups of the plurality of hydraulic formwork structures are spaced apart along the extension direction of the support longitudinal beams.

3. The secondary lining formwork system for underground tunneling engineering according to claim 2 is characterized in that: The bracket longitudinal beams are provided with five, which are respectively an upper bracket longitudinal beam, two middle bracket longitudinal beams and two lower bracket longitudinal beams, the upper bracket longitudinal beam is arranged on the middle upper side of the two middle bracket longitudinal beams, and the two lower bracket longitudinal beams are arranged on the lower sides of the two middle bracket longitudinal beams respectively; Reinforcement beams are fixedly connected between the upper support longitudinal beam and the two middle support longitudinal beams, between the middle support longitudinal beam and the lower support longitudinal beam, between the two middle support longitudinal beams, and between the two lower support longitudinal beams.

4. The secondary lining formwork system for underground tunneling engineering according to claim 3 is characterized in that: There are five hydraulic formwork structures, namely, an upper hydraulic formwork structure, an upper corner hydraulic formwork structure, a middle side hydraulic formwork structure, a lower side hydraulic formwork structure, and a lower corner hydraulic formwork structure. The upper hydraulic formwork structure is installed on the upper support longitudinal beam, the upper corner hydraulic formwork structure and the middle side hydraulic formwork structure are both installed on the middle side support longitudinal beam, and the lower side hydraulic formwork structure and the lower corner hydraulic formwork structure are both installed on the lower side support longitudinal beam.

5. The secondary lining formwork system for underground tunneling engineering according to claim 4 is characterized in that: The hydraulic jack columns of the upper hydraulic formwork structure are vertically extended on the upper support longitudinal beams, the hydraulic jack columns of the upper corner hydraulic formwork structure are vertically extended on the middle support longitudinal beams, the hydraulic jack columns of the middle hydraulic formwork structure are horizontally extended on the middle support longitudinal beams, the hydraulic jack columns of the lower hydraulic formwork structure are horizontally extended on the lower support longitudinal beams, and the hydraulic jack columns of the lower corner hydraulic formwork structure are vertically extended on the lower support longitudinal beams.

6. The secondary lining formwork system for underground tunneling engineering according to claim 4 is characterized in that: The upper support longitudinal beam and the two middle support longitudinal beams are distributed in a shape of a triangle in the cross section of the support body, and a T-shaped reinforcing beam is detachably connected between the upper support longitudinal beam and the two middle support longitudinal beams.

7. The secondary lining formwork system for underground tunneling engineering according to claim 1 is characterized in that: The pressing support is hingedly mounted on the end of the hydraulic jack, and the hinge axis of the pressing support is arranged parallel to the length direction of the support body.

8. The secondary lining formwork system for underground tunneling engineering according to claim 1 is characterized in that: The top pressure support is located on the outer side of the hydraulic top column and is provided with two segmented templates. When in the expanded position, the two segmented templates and the top pressure support are connected to form a second lining template section that matches the inner contour of the primary support.

9. The secondary lining formwork system for underground tunneling engineering according to claim 4 is characterized in that: The lower corner hydraulic formwork structure also includes a bottom formwork, one side of which is hingedly connected to the edge of the segmented formwork of the lower corner hydraulic formwork structure, and a bottom drive is also connected between the bottom formwork and the segmented formwork of the lower corner hydraulic formwork structure.

10. The secondary lining formwork system for underground tunneling engineering according to claim 1 is characterized in that: The force-transmitting corbel includes two end plates, a web and a rib plate. The two end plates are arranged in parallel and spaced apart. The web and the rib plate are fixedly connected between the two end plates. The spoiler is fixedly connected to the web at a position between the two end plates, and the spoiler protrudes from the outer contour of the two end plates. One end plate is detachably connected to the top pressure support with a fastening bolt.

Images