A widened inner formwork for a immersed tube and a method of construction thereof

Abstract

The present application relates to the technical field of immersed tube tunnel construction, and particularly relates to a widening inner formwork for an immersed tube and a construction method thereof, which comprises an inner formwork system, the inner formwork system comprises middle section formworks and outer side formworks arranged side by side; further comprising a widening formwork, the widening formwork is arranged between the outer side formworks and the middle section formworks, and the widening formwork is capable of transverse expansion and contraction, and the widening formwork adjusts the cross-sectional width of the inner formwork system through transverse expansion and contraction. The widening formwork is added between the outer side formworks and the middle section formworks, so that the adjustment of the inner formwork system is realized, and then the inner formwork system can adapt to the construction requirement of the increase of the cross-sectional width of the immersed tube. Since the widening formwork is capable of transverse expansion and contraction, the widening formwork adjusts the cross-sectional width of the inner formwork system through transverse expansion and contraction, so that more immersed tubes with different cross-sectional widths can be adapted, and the use range of the inner formwork system is expanded.

Description

Technical Field

[0001] This invention relates to the field of immersed tunnel construction technology, and in particular to a widened inner formwork for immersed tunnels and its construction method. Background Technology

[0002] Large-scale immersed tunnel casting is a critical and dangerous engineering operation. It generally adopts a standardized steel structure formwork structure, which is usually applied in a modular form, divided into main parts such as the bottom plate, walls, and top plate. The existing immersed tunnel formwork structure is generally reused for segment casting, that is, one model is used for casting all segments and parts.

[0003] However, the existing immersed tunnel formwork structure is universal and only applicable to the prefabrication of immersed tunnels of fixed specifications and models. It has poor flexibility. When the size of the immersed tunnel structure changes, the formwork will become unsuitable. For example, in the construction of urban immersed tunnels, there is an existing two-way four-lane immersed tunnel formwork inner mold, but due to the engineering design requirements, a two-way six-lane immersed tunnel formwork inner mold is required. At this time, making a new inner mold not only consumes a lot of time, but also greatly increases the construction cost. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing immersed tube template structures in the background art are limited in versatility and only applicable to immersed tubes of fixed specifications, and to provide a widened inner template for immersed tubes and its construction method.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] A widened inner template for immersed tunnel sections includes an inner template system, the inner template system comprising a middle section template and an outer template arranged side by side;

[0007] It also includes a widening template, which is disposed between the outer template and the middle section template, and the widening template is capable of lateral expansion and contraction, thereby adjusting the cross-sectional width of the inner template system.

[0008] This application describes a widened inner formwork for immersed tunnel sections. By adding a widened formwork between the outer and middle section formworks, the inner formwork system can be adjusted, thereby increasing its cross-sectional width. This allows the inner formwork system to adapt to the increased construction requirements of the immersed tunnel cross-section, i.e., the construction requirements after widening the immersed tunnel. This solves the problem of poor versatility of existing inner formwork, which is only suitable for prefabricated immersed tunnel sections of fixed specifications. It effectively saves costs and improves construction efficiency during construction. At the same time, because the widened formwork can expand and contract laterally, the cross-sectional width of the inner formwork system can be adjusted by adjusting the lateral expansion distance of the widened formwork. This allows the widened inner formwork for immersed tunnel sections to be adapted to a wider range of tunnel sections with different cross-sectional widths, expanding the application range of the inner formwork system and avoiding the need for multiple replacements of widened formwork with different widths. The widened inner formwork for immersed tunnel sections described in this application provides a low-cost, flexible inner formwork system with great potential for widespread application.

[0009] Preferably, the widened template includes an interconnected folded top plate and a first vertical support, the first vertical support being located below the folded top plate;

[0010] An extension system is provided between adjacent first vertical supports, which can move adjacent first vertical supports closer to each other or further apart.

[0011] The telescopic system moves adjacent first vertical supports closer together or further apart. For example, when expanding, the telescopic system expands outward, causing adjacent first vertical supports to move further apart. When adjacent first vertical supports move further apart, the folding top plate expands, thereby widening the cross-section of the widened template and increasing the cross-sectional width of the inner template system. When contracting, the telescopic system contracts inward, causing adjacent first vertical supports to move closer together. When adjacent first vertical supports move closer together, the folding top plate contracts, thereby reducing the cross-section of the widened template and decreasing the cross-sectional width of the inner template system.

[0012] Preferably, the telescopic system includes a first telescopic support rod, which is spaced apart from adjacent first vertical supports, and the end of the first telescopic support rod is connected to the first vertical support.

[0013] By setting a first telescopic strut between adjacent first vertical supports, the first telescopic strut can drive the adjacent first vertical supports to move closer to each other or further apart.

[0014] Preferably, the telescopic system further includes a telescopic bracket, which is disposed between adjacent first vertical supports and is arranged parallel to the first telescopic support rod.

[0015] The stability between adjacent first vertical supports is increased by adding telescopic brackets.

[0016] Preferably, the widened template further includes a sliding system, which is disposed at the bottom of the first vertical support, and the first vertical support moves laterally through the sliding system.

[0017] As the first telescopic strut moves the adjacent first vertical struts closer to or further away from each other, the first vertical struts move laterally on the ground through the sliding system at the bottom, so that the first vertical struts can move laterally on the ground.

[0018] Preferably, the sliding system includes a sliding device, which includes a sliding table and a sliding base;

[0019] The sliding platform is connected to the bottom of the first vertical support, and a horizontal guide rail is provided on the sliding base. The sliding platform and the horizontal guide rail are slidably engaged.

[0020] By setting a sliding platform at the bottom of the first vertical support and a transverse guide rail on the sliding base, the first vertical support can move on the sliding base through the sliding cooperation between the sliding platform and the transverse guide rail, so that the first vertical support can move laterally on the ground.

[0021] Preferably, the sliding device further includes a connector, one end of which is connected to the sliding table, and the other end of which is detachably connected to the bottom of the first vertical support.

[0022] Preferably, the sliding system includes a traverse trolley, which is detachably connected to the bottom of the first vertical support.

[0023] By setting a transverse trolley at the bottom of the first vertical support, the first vertical support can move laterally on the ground via the transverse trolley at the bottom, so that the first vertical support can move laterally on the ground.

[0024] Preferably, the intermediate section template includes an inner mold top mold, an inner mold truss, and inner mold legs connected sequentially from top to bottom;

[0025] One side of the folded top plate is connected to the inner mold top mold, and one side of the first vertical support is connected to the inner mold truss.

[0026] The other side of the folded top plate is hinged to the outer template, and the other side of the first vertical support supports the outer template.

[0027] This application also discloses a construction method for a widened inner formwork for immersed tunnels. Using the widened inner formwork for immersed tunnels described in this application, the method further includes the following steps:

[0028] S1: First, separate the middle section template and the outer template, and then connect the widened template to the middle section template;

[0029] S2: Adjust the cross-sectional width of the widened template according to construction needs to allow the widened template to expand and contract laterally;

[0030] S3: Install the outer template onto the widened template, and install a second telescopic support between the widened template and the outer template.

[0031] This application discloses a construction method for widened inner formwork used in immersed tunnel construction. The widened formwork is installed between the intermediate formwork section and the outer formwork section. During construction, the widened formwork section is first connected to the intermediate formwork section. Then, the lateral width of the widened formwork section is adjusted according to construction requirements, thereby adjusting the cross-sectional width of the multi-inner formwork system. The outer formwork section is then installed on the widened formwork section, and a second telescopic support rod is installed between the widened and outer formwork sections to support the outer formwork section, facilitating its expansion and contraction. This method for widened inner formwork used in immersed tunnel construction can adapt to more immersed tunnel sections with different cross-sections, expanding the application range of the inner formwork system. It avoids the need for multiple replacements of widened formwork sections of different widths, greatly improving construction efficiency and effectively saving construction costs.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 1. The widened inner formwork for immersed tunnels described in this application adjusts the inner formwork system by adding a widened formwork between the outer formwork and the middle section formwork, thereby increasing the cross-sectional width of the inner formwork system. This allows the inner formwork system to adapt to the construction requirements of the increased cross-section of the immersed tunnel, i.e., the construction requirements after the tunnel is widened. This solves the problem of poor versatility of existing inner formwork, which is only suitable for prefabricated immersed tunnels of fixed specifications. It effectively saves costs and improves construction efficiency during construction. At the same time, since the widened formwork can expand and contract laterally, the cross-sectional width of the inner formwork system can be adjusted by adjusting the lateral expansion and contraction distance of the widened formwork. This allows the widened inner formwork for immersed tunnels described in this embodiment to adapt to more immersed tunnels with different cross-sectional widths, thereby expanding the application range of the inner formwork system and avoiding the need for multiple replacements of widened formworks of different widths. The widened inner formwork for immersed tunnels described in this application provides a low-cost, flexible inner formwork system with great potential for widespread application.

[0034] 2. This application discloses a construction method for widened inner formwork for immersed tunnels. The widened formwork is installed between the intermediate section formwork and the outer formwork. During construction, the widened formwork is first connected to the intermediate section formwork. Then, the lateral width of the widened formwork is adjusted according to construction requirements, thereby adjusting the cross-sectional width of the multi-inner formwork system. The outer formwork is then installed on the widened formwork, and a second telescopic support is installed between the widened formwork and the outer formwork to support the outer formwork for easy expansion and contraction. This construction method for widened inner formwork for immersed tunnels can adapt to the construction of more immersed tunnels with different cross-sections, expanding the application range of the inner formwork system, thereby avoiding multiple replacements of widened formwork of different widths, greatly improving construction efficiency, and effectively saving construction costs. Attached image description:

[0035] Figure 1 This is a schematic diagram of the existing immersed tube inner mold and the required immersed tube inner mold.

[0036] Figure 2 This is a schematic diagram of the widened inner template of this application (without setting the widened template).

[0037] Figure 3 This is a schematic diagram of the widened inner template of this application (the widened template is set).

[0038] Figure 4 yes Figure 3 Floor plan.

[0039] Figure 5 This is a schematic diagram showing the coordination between the widened template and the inner template system.

[0040] Figure 6 This is a structural diagram of the widened template.

[0041] Figure 7 This is a schematic diagram of a sliding system.

[0042] Figure 8 This is a schematic diagram of a preferred structure for widening the inner template.

[0043] Figure 9 This is a schematic diagram of a preferred structure for widening the template.

[0044] The diagram is labeled as follows: 1-Inner formwork system, 2-Intermediate section formwork, 21-Top formwork of inner formwork, 22-Inner formwork truss, 23-Inner formwork support leg, 3-Inner side formwork, 4-Outer side formwork, 5-Wideened formwork, 51-Folded top plate, 52-First vertical support, 521-Main beam, 522-Hydraulic telescopic support leg, 54-Telescopic system, 541-First telescopic strut, 542-Telescopic bracket, 55-Transverse trolley, 56-Sliding device, 561-Transverse guide rail, 562-Sliding table, 563-Sliding cylinder, 564-Sliding base, 565-Connector, 6-Immersed tube, 7-Second telescopic strut, 8-Staff member, 10-Existing immersed tube inner formwork, 20-Required immersed tube inner formwork. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to embodiments and specific implementation methods. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0046] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0047] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0048] Furthermore, the use of terms such as "first," "second," "third," etc. in terminology is merely for distinguishing identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0049] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, nine, or even more than nine.

[0050] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0051] Example 1

[0052] like Figures 2-9 As shown in the figure, the widened inner template for immersed tubes described in this embodiment includes an inner template system 1, which includes a middle section template 2 and an outer template 4 arranged side by side.

[0053] It also includes a widened template 5, which is set between the outer template 4 and the middle section template 2. One side of the widened template 5 is connected to the middle section template 2, and the other side of the widened template 5 can support the outer template 4.

[0054] Furthermore, the widened template 5 can expand and contract laterally, and the widened template 5 adjusts the cross-sectional width of the inner template system 1 by expanding and contracting laterally.

[0055] By adding a widened template 5 between the outer template 4 and the middle template 2, the inner template system 1 is adjusted, thereby increasing the cross-sectional width of the inner template system 1. This allows the inner template system to adapt to the construction requirements of the enlarged cross-section of the immersed tube 6, i.e., the construction requirements after the widening of the immersed tube 6. This solves the problem of poor versatility of existing inner templates, which are only suitable for prefabricated immersed tubes of fixed specifications. It effectively saves costs and improves construction efficiency during construction. At the same time, since the widened template 5 can expand and contract laterally, the cross-sectional width of the inner template system 1 can be adjusted by adjusting the lateral expansion and contraction distance of the widened template 5. This allows the widened inner template for immersed tubes described in this embodiment to adjust the cross-sectional width of the inner template system 1 by adjusting the lateral expansion and contraction distance of the widened template 5, so as to adapt to more immersed tubes 6 with different cross-sectional widths. This expands the application range of the inner template system 1 and avoids the need to replace widened templates 5 with different widths multiple times. The widened inner template for immersed tubes described in this embodiment provides a low-cost, flexible inner template system with great potential for promotion.

[0056] A preferred method, such as Figure 5 As shown, the widened template 5 includes a folded top plate 51 and a first vertical support 52 connected to each other, with the first vertical support 52 located below the folded top plate 51;

[0057] A telescopic system 54 is provided between adjacent first vertical supports 52, which can move adjacent first vertical supports 52 closer to each other or further apart.

[0058] The telescopic system moves adjacent first vertical supports 52 closer together or further apart. For example, when expanding, the telescopic system expands outward, causing adjacent first vertical supports 52 to move further apart. When adjacent first vertical supports 52 move further apart, the folding top plate 51 expands, thereby widening the cross-section of the widened template 5 and increasing the cross-sectional width of the inner template system 1. When contracting, the telescopic system contracts inward, causing adjacent first vertical supports 52 to move closer together. When adjacent first vertical supports 52 move closer together, the folding top plate 51 contracts, thereby reducing the cross-section of the widened template 5 and decreasing the cross-sectional width of the inner template system 1.

[0059] In this application, as Figure 5 As shown, the excess portion of the folding top plate 51 is hidden below the inner mold top mold 21. When the folding top plate 51 is stretched, the excess portion hidden below the inner mold top mold 21 is lifted up as an additional portion of the folding top plate 51 to accommodate the expansion of the folding top plate 51 when the adjacent first vertical supports 52 are far apart. When the folding top plate 51 is contracted, a portion of the template is slid to the bottom of the inner mold top mold 21 to accommodate the contraction of the folding top plate 51 when the adjacent first vertical supports 52 are close together.

[0060] In a preferred manner, the folding roof panel 51 can be expanded or contracted by assembling multiple templates. For example, when adjacent first vertical supports 52 are far apart, new templates are added to the original folding roof panel 51 to increase the area of ​​the folding roof panel 51 and achieve the purpose of expansion. When adjacent first vertical supports 52 are close together, some templates are removed from the original folding roof panel 51 to reduce the area of ​​the folding roof panel 51 and achieve the purpose of contraction.

[0061] A preferred method, such as Figure 6 As shown, the first vertical support 52 includes a main beam 521 and a hydraulic telescopic outrigger 522. The main beam 521 is connected above the hydraulic telescopic outrigger 522. By setting the hydraulic telescopic outrigger 522, the height of the first vertical support 52 can be adjusted according to the construction requirements during construction, which facilitates installation.

[0062] A preferred method, such as Figure 6 As shown, the telescopic system 54 includes a first telescopic strut 541, which is spaced apart from adjacent first vertical supports 52, and the end of the first telescopic strut 541 is connected to the first vertical support 52. By setting the first telescopic strut 541 between adjacent first vertical supports 52, the first telescopic strut 541 can drive the adjacent first vertical supports 52 to move closer or further apart, thereby increasing or decreasing the cross-section of the widened template 5. Furthermore, the end of the first telescopic strut 541 is connected to the main beam 521, such as... Figure 6 As shown, the two ends of the first telescopic strut 541 are respectively connected to two adjacent main beams 521.

[0063] A preferred method, such as Figure 6 As shown, the telescopic system 54 also includes a telescopic bracket 542, which is disposed between adjacent first vertical supports 52 and is arranged parallel to the first telescopic struts 541. The addition of the telescopic bracket 542 increases the stability between adjacent first vertical supports 52. The telescopic bracket 542 is arranged parallel between the two first telescopic struts 541, and furthermore, both sides of the telescopic bracket 542 are respectively connected to two adjacent main beams 521.

[0064] In this application, the telescopic bracket 542 is a scissor bracket.

[0065] A preferred method, such as Figures 6-7 As shown, the widened template 5 also includes a sliding system, which is located at the bottom of the first vertical support 52. The first vertical support 52 moves laterally through the sliding system. When the first telescopic support rod 541 moves the adjacent first vertical supports 52 closer to or further away from each other, the first vertical support 52 moves laterally on the ground through the sliding system at its bottom, so that the first vertical support 52 can move laterally on the ground.

[0066] A preferred method, such as Figure 7 As shown, the sliding system includes a sliding device 56, which includes a sliding table 562 and a sliding base 564.

[0067] A sliding platform 562 is connected to the bottom of the first vertical support 52, and a transverse guide rail 561 is provided on the sliding base 564. The sliding platform 562 and the transverse guide rail 561 are slidably engaged. By providing a sliding platform 562 at the bottom of the first vertical support 52 and a transverse guide rail 561 on the sliding base 564, the first vertical support 52 can move on the sliding base 564 through the slidable engagement of the sliding platform 562 and the transverse guide rail 561, thereby enabling the first vertical support 52 to move laterally on the ground.

[0068] In a preferred embodiment, the sliding device 56 further includes a sliding cylinder 563, which is mounted on the sliding base 564. The sliding cylinder 563 can push the sliding table 562, and can extend and retract synchronously with the first telescopic support rod 541. When it is necessary to adjust the width of the widened template, the distance between adjacent first vertical supports 52 is adjusted by the first telescopic support rod 541. At this time, the sliding cylinder 563 extends and retracts synchronously, applying an auxiliary external force to the sliding table 562, making it more convenient for the first vertical supports 52 to move laterally.

[0069] A preferred method, such as Figure 7 As shown, the sliding device also includes a connector 565, one end of which is connected to the sliding table 562, and the other end of which is detachably connected to the bottom of the first vertical support 52. The sliding table 562 is connected to the bottom of the first vertical support 52 via the connector 565. Preferably, the connector 565 is a bolt, and the bolt connection is achieved by opening bolt holes at the bottom of the first vertical support 52.

[0070] Furthermore, such as Figure 7 As shown, one end of the connector 565 is connected to the sliding table 562, and the other end of the connector 565 is detachably connected to the bottom of the hydraulic telescopic outrigger 522.

[0071] A preferred method, such as Figures 8-9 As shown, the sliding system includes a transverse trolley 55, which is detachably connected to the bottom of the first vertical support 52.

[0072] By setting a transverse trolley 55 at the bottom of the first vertical support 52, the first vertical support 52 can move laterally on the ground via the transverse trolley 55 at the bottom, so that the first vertical support 52 can move laterally on the ground.

[0073] like Figure 5As shown, the intermediate section template 2 includes an inner mold top mold 21, an inner mold truss 22 and an inner mold support leg 23 connected from top to bottom;

[0074] One side of the folded top plate 51 is connected to the inner mold top mold 21, and one side of the first vertical support 52 is connected to the inner mold truss 22.

[0075] The other side of the folded top plate 51 is hinged to the outer template 4, and the other side of the first vertical support 52 supports the outer template 4.

[0076] The first vertical support 52 is connected to the inner formwork truss 22 through the rod 8. Bolt plates are provided at both ends of the rod 8. Bolt holes are opened at the corresponding positions of the first vertical support 52 and the inner formwork truss 22. The two ends of the rod 8 are connected to the first vertical support 52 and the inner formwork truss 22 respectively by bolt connection to achieve detachable connection, which is convenient for subsequent installation and dismantling.

[0077] The other side of the folded top plate 51 is hinged to the outer template 4, and the other side of the first vertical support 52 is connected to the outer template 4 through the second telescopic support rod 7 to support the outer template 4.

[0078] In this application, if Figure 1 As shown, the existing immersed tube inner mold 10 is a 4-lane immersed tube inner mold, while the required immersed tube inner mold 20 is a 6-lane immersed tube inner mold. By adding a widening template 5 to the inner template system 1 and appropriately adjusting the cross-sectional width of the widening template 5, the 4-lane immersed tube inner mold can be adjusted to a 6-lane immersed tube inner mold, so as to accommodate more immersed tubes 6 with different cross-sectional widths.

[0079] In a preferred embodiment, both the first telescopic strut 541 and the second telescopic strut 7 are hydraulic telescopic struts.

[0080] Example 2

[0081] Based on Example 1, this example also discloses a construction method for a widened inner formwork for immersed tunnels. Using the widened inner formwork for immersed tunnels described in Example 1, the method further includes the following steps:

[0082] S1: First, disassemble the middle section template 2 and the outer template 4, and then connect the widened template 5 to the middle section template 2. The first vertical support 52 is connected to the inner formwork truss 22 through the rod 8. Bolt plates are provided at both ends of the rod 8. Bolt holes are opened at the corresponding positions of the first vertical support 52 and the inner formwork truss 22. The two ends of the rod 8 are connected to the first vertical support 52 and the inner formwork truss 22 respectively by bolt connection to achieve detachable connection, which is convenient for subsequent installation and dismantling.

[0083] S2: Adjust the cross-sectional width of the widened template 5 according to construction needs to allow the widened template 5 to expand and contract laterally. The expansion system moves adjacent first vertical supports 52 closer to or further away from each other. For example, when expanding, the expansion system expands outward, moving adjacent first vertical supports 52 further away from each other. When adjacent first vertical supports 52 move further away from each other, the folding top plate 51 expands, thereby widening the cross-section of the widened template 5 and increasing the cross-sectional width of the inner template system 1. When contracting, the expansion system contracts inward, moving adjacent first vertical supports 52 closer to each other. When adjacent first vertical supports 52 move closer to each other, the folding top plate 51 contracts, thereby reducing the cross-section of the widened template 5 and decreasing the cross-sectional width of the inner template system 1.

[0084] S3: Install the outer template 4 on the widened template 5, and install the second telescopic support rod 7 between the widened template 5 and the outer template 4. The other side of the folded top plate 51 is hinged to the outer template 4, and the other side of the first vertical support 52 is connected to the outer template 4 through the second telescopic support rod 7 to support the outer template 4.

[0085] During construction, the widened template 5 is first connected to the intermediate template 2. Then, the lateral width of the widened template 5 is adjusted according to construction requirements, thereby adjusting the cross-sectional width of the multi-internal template system 1. The outer template 4 is then installed on the widened template 5, and a second telescopic support rod 7 is installed between the widened template 5 and the outer template 4. The outer template 4 is supported by the second telescopic support rod 7. During construction, the extension and retraction of the second telescopic support rod 7 is controlled to control the retraction and expansion of the outer template 4, so that the outer template 4 can be extended and retracted according to construction needs. This application provides a construction method for widened inner templates for immersed tunnels, which can adapt to the construction of immersed tunnels 6 with more different cross-sections, expand the application range of the inner template system 1, thereby avoiding the need to replace widened templates 5 of different widths multiple times, greatly improving construction efficiency and effectively saving construction costs.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A widened inner template for immersed tunnel sections, characterized in that, It includes an inner template system (1), which includes a middle section template (2) and an outer template (4) arranged side by side; It also includes a widening template (5), which is disposed between the outer template (4) and the middle section template (2), and the widening template (5) can be extended and retracted laterally. The widening template (5) adjusts the cross-sectional width of the inner template system (1) by extending and retracting laterally. The widened template (5) includes a folded top plate (51) and a first vertical support (52) connected to each other, the first vertical support (52) being located below the folded top plate (51); A telescopic system (54) is provided between adjacent first vertical supports (52), and the telescopic system (54) can drive adjacent first vertical supports (52) to move closer to each other or further away from each other; The telescopic system (54) includes a first telescopic support rod (541), which is spaced apart from adjacent first vertical supports (52), and the end of the first telescopic support rod (541) is connected to the first vertical support (52). The widened template (5) also includes a sliding system, which is disposed at the bottom of the first vertical support (52), and the first vertical support (52) moves laterally through the sliding system; The sliding system includes a sliding device (56), which includes a sliding table (562) and a sliding base (564); The sliding table (562) is connected to the bottom of the first vertical support (52), and a transverse guide rail (561) is provided on the sliding base (564). The sliding table (562) and the transverse guide rail (561) are slidably engaged. The intermediate section template (2) includes an inner mold top mold (21), an inner mold truss (22) and an inner mold support leg (23) connected from top to bottom; One side of the folded top plate (51) is connected to the inner mold top mold (21), and one side of the first vertical support (52) is connected to the inner mold truss (22); The other side of the folded top plate (51) is hinged to the outer template (4), and the other side of the first vertical support (52) supports the outer template (4); The sliding device (56) further includes a sliding cylinder (563), which is mounted on the sliding base (564). The sliding cylinder (563) can push the sliding table (562) and can extend and retract synchronously with the first telescopic support rod (541).

2. The widened inner template for immersed tubes according to claim 1, characterized in that, The telescopic system (54) further includes a telescopic bracket (542), which is disposed between adjacent first vertical supports (52) and is arranged parallel to the first telescopic support rod (541).

3. The widened inner template for immersed tubes according to claim 1, characterized in that, The sliding device also includes a connector (565), one end of which is connected to the sliding table (562), and the other end of which is detachably connected to the bottom of the first vertical support (52).

4. The widened inner template for immersed tubes according to claim 1, characterized in that, The sliding system includes a transverse trolley (55), which is detachably connected to the bottom of the first vertical support (52).

5. A method for constructing a widened inner formwork for immersed tunnels, characterized in that, Using the widened inner template for immersed tunnel as described in any one of claims 1-4, the method further includes the following steps: S1: First, separate the middle section template (2) and the outer template (4), and then connect the widened template (5) to the middle section template (2); S2: Adjust the cross-sectional width of the widened template (5) according to construction needs, so that the widened template (5) can expand and contract laterally; S3: Install the outer template (4) on the widened template (5), and install the second telescopic support rod (7) between the widened template (5) and the outer template (4).

Images