Combined inner formwork for variable cross-section immersed tube pouring and construction method thereof

Abstract

This invention relates to the field of immersed tunnel construction technology, specifically a combined internal formwork for casting variable cross-section immersed tunnels and its construction method. The formwork includes an internal formwork system and a variable cross-section compensation formwork. The internal formwork system includes a middle section formwork, with outer and inner formwork at both ends. One side of the variable cross-section compensation formwork is connected to the middle section formwork, and the other side supports the outer formwork. It also includes side formwork compensation templates, which are placed at the bends of the outer formwork. By combining the internal formwork system with the variable cross-section compensation templates and side formwork compensation templates, the internal formwork system can adapt to the casting of variable cross-section immersed tunnels, allowing for rapid assembly into an internal formwork structure suitable for variable cross-section immersed tunnels. This solves the problems of poor versatility, high assembly difficulty, and low efficiency of existing internal formwork systems.

Description

Technical Field

[0001] This invention relates to the field of immersed tunnel construction technology, and in particular to a combined internal formwork for casting of variable cross-section 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, existing immersed tunnel formwork structures are limited in versatility, only suitable for prefabricated immersed tunnel sections of fixed specifications, resulting in poor flexibility. Changes in the dimensions of the immersed tunnel structure can render the formwork unsuitable. For example, in urban immersed tunnel construction, when the buried section at the end of the immersed tunnel is shallow, it may be necessary to complete the merging at the end of the tunnel, reducing an 8-lane roadway to a 6-lane roadway. Figure 1 As shown, the end of the variable cross-section immersed tube 4 needs to be set as a variable cross-section section to realize lane merging. However, the existing immersed tube inner template has single universality and poor flexibility. It is only suitable for the prefabrication of immersed tubes with fixed specifications and models, and it is difficult to be used for the casting of variable cross-section immersed tubes, which cannot meet the construction requirements. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing immersed tube internal formwork structures in the background art are limited in versatility and only applicable to the prefabrication of immersed tubes of fixed specifications and models, making them difficult to apply to the casting of immersed tubes with variable cross-sections. This invention provides a combined internal formwork for the casting of immersed tubes with variable cross-sections and its construction method.

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

[0006] A combined internal formwork for casting of variable cross-section immersed tubes includes an internal formwork system and a variable cross-section compensation formwork;

[0007] The inner template system includes a middle section template, and outer templates and inner templates are respectively provided at both ends of the middle section template;

[0008] One side of the variable cross-section compensation template is connected to the middle section template, and the other side of the variable cross-section compensation template can support the outer template;

[0009] It also includes a side mold compensation template, which is disposed at the bend of the outer mold.

[0010] This application describes a combined internal formwork for casting variable cross-section immersed tubes. During the casting of variable cross-section immersed tubes, an internal formwork system is combined with variable cross-section compensation formwork and side formwork compensation formwork. A variable cross-section compensation formwork is added between the outer formwork and the middle section formwork of the internal formwork system. The variable cross-section compensation formwork is connected to the middle section formwork and supports the outer formwork. Side formwork compensation formwork is installed at the bends of the outer formwork, enabling the internal formwork system to adapt to the casting of variable cross-section immersed tubes. This allows for rapid assembly into an internal formwork structure system that conforms to the full cross-section of the variable cross-section immersed tube, solving a series of problems such as poor versatility, high assembly difficulty, and low efficiency of existing internal formwork. This improves the applicability of existing internal formwork for immersed tubes. Furthermore, this application solves the problem that existing internal formwork is not suitable for casting irregularly shaped sections of immersed tubes, providing a low-cost, flexible, and adaptable formwork solution. This combined internal formwork, which can be applied to the casting of various specifications of segments by adding a small number of components, has great potential for widespread adoption.

[0011] 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;

[0012] The variable cross-section compensation template includes several compensation blocks, and each compensation block includes a compensation top form, a compensation truss and a compensation support leg connected in sequence from top to bottom;

[0013] One side of the compensation top mold is connected to the inner top mold, one side of the compensation truss is connected to the inner truss, the compensation leg is arranged side by side with the inner truss, and the other side of the compensation top mold is hinged to the outer template, and the other side of the compensation truss supports the outer template.

[0014] By connecting the compensation block with the intermediate section formwork, the compensation block and the intermediate section formwork are integrated to change the cross-sectional shape of the inner formwork system 1. At the same time, the compensation block supports the outer formwork, enabling the outer formwork to be used normally. Furthermore, the compensation block, combined with the inner formwork system, forms a support platform for concrete pouring. The compensation legs provide vertical support for the upper compensation top formwork, transferring the construction load generated by the concrete and pouring to the pouring platform or the bottom plate of the immersed tube.

[0015] Preferably, the compensating top mold is hinged to the inner top mold, and the compensating truss is bolted to the inner truss. This ensures a secure connection between the compensating block and the intermediate template.

[0016] Preferably, the compensating top formwork is hinged to the top of the outer template, and the compensating truss is connected to the lower part of the outer template via hydraulic rods. Because the compensating top formwork is hinged to the top of the outer template, the outer template can rotate around the compensating top formwork. Furthermore, the compensating truss is connected to the lower part of the outer template via hydraulic rods, allowing the compensating truss to support the outer template. During construction, the extension and retraction of the hydraulic rods are controlled to control the retraction and expansion of the outer template.

[0017] Preferably, the outer template includes a first straight segment template, a second inclined segment template, and a third straight segment template that are sequentially adjacent to each other;

[0018] The side mold compensation template includes a first side module and a second side module. The first side module is disposed between the first straight segment template and the second inclined segment template, and the second side module is disposed between the second inclined segment template and the third straight segment template.

[0019] Preferably, the first side module includes a first wedge-shaped block and a first rectangular block, wherein the inclined side of the first wedge-shaped block is connected to the first rectangular block;

[0020] The side of the first wedge block away from the first rectangular block is connected to the first straight segment template, and the side of the first rectangular block away from the first wedge block is connected to the second inclined segment template.

[0021] Preferably, the second side module includes a second rectangular block, a second wedge block, and a third rectangular block connected in sequence, wherein the inclined side of the second wedge block is connected to the second rectangular block, and the side of the second wedge block away from the inclined side is connected to the third rectangular block;

[0022] The side of the second rectangular block away from the second wedge block is connected to the second inclined segment template, and the side of the third rectangular block away from the second wedge block is connected to the third straight segment template.

[0023] This application also discloses a construction method for a combined internal formwork for casting variable cross-section immersed tubes. Using the combined internal formwork as described in this application, the method further includes the following steps:

[0024] S1: The variable cross-section immersed tube is divided into three segments from the small cross-section end to the large cross-section end, namely the first segment immersed tube, the second segment immersed tube and the third segment immersed tube. The variable cross-section compensation template is correspondingly divided into a first compensation block, a second compensation block and a third compensation block. The side formwork compensation template includes a first side module and a second side module.

[0025] Before pouring the first segment of the immersed tube, the inner template system is disassembled, and then the first compensation block is assembled between the outer template and the middle section template. The first side module is installed at the bend of the outer template inside the first segment of the immersed tube, so that the inner template system, the first compensation block and the first side module are assembled into a whole, and then the first segment of the immersed tube is poured.

[0026] S2: After S1 is completed, the inner template system and the first compensation block are disassembled, the first compensation block and the first side module are removed, and then disassembled and transported away from the site.

[0027] S3: Before pouring the second segment of the immersed tube, assemble the second compensation block between the outer template and the middle template, so that the inner template system and the second compensation block are assembled into a whole, and then pour the second segment of the immersed tube.

[0028] S4: After S3 is completed, the inner template system and the second compensation block are disassembled, the second compensation block is removed and the parts are disassembled and transported away from the site;

[0029] S5: Before pouring the third segment of the immersed tube, assemble the third compensation block between the outer template and the middle section template, and install the second side module at the bend of the outer template inside the third segment of the immersed tube, so that the inner template system, the third compensation block and the second side module are assembled into a whole, and then pour the third segment of the immersed tube.

[0030] S6: After S5 is completed, the inner template system and the third compensation block are disassembled, the third compensation block and the second side module are removed, and then disassembled and transported away from the site.

[0031] The present application describes a combined internal formwork construction method for casting variable cross-section immersed tubes. The variable cross-section immersed tubes are cast in segments sequentially. Before casting, corresponding compensation blocks and side modules are assembled according to the cross-section of each segment to meet the overall internal formwork shape of each segment. Through the combination of the internal formwork system and the variable cross-section compensation template and the side formwork compensation template, the internal formwork structure system that conforms to the full cross-section of the variable cross-section immersed tube can be quickly assembled. This solves a series of problems such as poor universality, high assembly difficulty, and low efficiency of existing internal formwork systems, and improves the universal applicability of variable cross-section tube section formwork and standard tube section formwork.

[0032] Preferably, during the stage of casting the bottom slab and wall of the variable cross-section immersed tube, the compensation top mold of each compensation block is connected to the inner top mold, and the compensation truss is connected to the inner truss.

[0033] Preferably, during the top slab stage of casting the variable cross-section immersed tube, compensation legs are installed on the bottom slab of the immersed tube, and the compensation legs are connected to the bottom of the compensation truss.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] 1. This application describes a combined internal formwork for casting variable cross-section immersed tubes. It optimizes existing internal formwork systems by combining an internal formwork system with variable cross-section compensation formwork and side formwork compensation formwork during variable cross-section immersed tube casting. A variable cross-section compensation formwork is added between the outer and middle sections of the internal formwork system, connecting to and supporting the outer formwork. Side formwork compensation formwork is also provided at bends in the outer formwork. This allows the internal formwork system to adapt to variable cross-section immersed tube casting, enabling rapid assembly into an internal formwork structure system conforming to the full cross-section of the variable cross-section immersed tube. This solves a series of problems with existing internal formwork systems, such as poor versatility, high assembly difficulty, and low efficiency. It improves the universal applicability of variable cross-section tube section formwork and standard tube section formwork. Furthermore, this application addresses the problem that existing standard internal formwork is unsuitable for casting irregularly shaped immersed tube sections, providing a low-cost, flexible formwork solution. This combined internal formwork, which can be applied to casting various specifications of sections by adding a small number of components, has great potential for widespread adoption.

[0036] 2. The combined internal formwork construction method for variable cross-section immersed tube casting described in this application adopts segmented sequential casting for the variable cross-section immersed tube. Before casting, the corresponding compensation blocks and side modules are assembled according to the cross-section of each segment to meet the overall internal formwork shape of each segment. Through the combination of the internal formwork system and the variable cross-section compensation template and the side formwork compensation template, the internal formwork structure system that conforms to the full cross-section of the variable cross-section immersed tube can be quickly assembled, solving a series of problems such as poor universality, high assembly difficulty, and low efficiency of the existing internal formwork system, and improving the universal applicability of variable cross-section tube section formwork and standard tube section formwork. Attached image description:

[0037] Figure 1 This is a schematic diagram of a variable cross-section immersed tube.

[0038] Figure 2 This is a front view of the internal formwork system of this application (without the addition of variable cross-section compensation formwork and side formwork compensation formwork).

[0039] Figure 3 This is a combined internal formwork plan view of this application (with added variable cross-section compensation formwork and side formwork compensation formwork).

[0040] Figure 4 This is a plan view of the combined internal formwork for the first segment of the immersed tube.

[0041] Figure 5 yes Figure 4 The front view.

[0042] Figure 6These are the top and front views of the first compensation block.

[0043] Figure 7 This is a schematic diagram showing the first compensation block set in the inner template system.

[0044] Figure 8 This is a schematic diagram of the first side module installed on the outer template.

[0045] Figure 9 This is a schematic diagram of the first side module structure.

[0046] Figure 10 This is a schematic diagram of the combined inner formwork for the second segment of the immersed tube.

[0047] Figure 11 yes Figure 9 The front view.

[0048] Figure 12 These are the top and front views of the second compensation block.

[0049] Figure 13 This is a schematic diagram of the combined inner formwork of the third segment of the immersed tube.

[0050] Figure 14 yes Figure 12 The front view.

[0051] Figure 15 These are the top and front views of the third compensation block.

[0052] Figure 16 This is a schematic diagram of the second side module installed on the outer template.

[0053] Figure 17 This is a schematic diagram of the second-side module structure.

[0054] Figure 18 This is a schematic diagram of the installation of the inner formwork for the first segment of the immersed tunnel.

[0055] Figure 19 This is a schematic diagram of the installation of the inner formwork for the second segment of the immersed tunnel.

[0056] Figure 20 This is a schematic diagram of the installation of the inner formwork for the third segment of the immersed tunnel.

[0057] Figure 21 This is a schematic diagram of variable cross-section immersed tube casting. Figure 1 .

[0058] Figure 22 This is a schematic diagram of variable cross-section immersed tube casting. Figure 2 .

[0059] In the diagram, the markings are: 1-Inner formwork system, 11-Intermediate section formwork, 111-Inner top formwork, 112-Inner formwork truss, 113-Inner formwork support leg, 12-Outer formwork, 121-First straight section formwork, 122-Second inclined section formwork, 123-Third straight section formwork, 13-Inner formwork, 2-Variable cross-section compensation formwork, 21-First compensation block, 211-First compensation top formwork, 212-First compensation truss, 213-First compensation support leg, 22-Second compensation block, 221-Second compensation top formwork, 222... - Second compensation truss, 223- Second compensation leg, 23- Third compensation block, 231- Third compensation top formwork, 232- Third compensation truss, 233- Third compensation leg, 3- Side formwork compensation template, 31- First side module, 311- First wedge block, 312- First rectangular block, 32- Second side module, 321- Second rectangular block, 322- Second wedge block, 323- Third rectangular block, 4- Variable cross-section immersed tube, 41- First segment immersed tube, 42- Second segment immersed tube, 43- Third segment immersed tube. Detailed Implementation

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0065] 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.

[0066] Example 1

[0067] like Figures 1-17 As shown in the figure, the combined internal formwork for variable cross-section immersed tube casting described in this embodiment includes an internal formwork system 1 and a variable cross-section compensation formwork 2;

[0068] The inner template system 1 includes a middle section template 11, with an outer template 12 and an inner template 13 respectively provided at both ends of the middle section template 11, and both the outer template 12 and the inner template 13 extend downward.

[0069] The variable cross-section compensation template 2 is set between the outer template 12 and the middle section template 11, and one side of the variable cross-section compensation template 2 is connected to the middle section template 11, while the other side of the variable cross-section compensation template 2 can support the outer template 12.

[0070] It also includes a side formwork compensation template 3, which is set at the bend of the outer formwork 12.

[0071] This embodiment describes a combined internal formwork for casting variable cross-section immersed tubes. When casting the variable cross-section immersed tube 4, it employs a combination of an internal formwork system 1, a variable cross-section compensation formwork 2, and a side formwork compensation formwork 3. A variable cross-section compensation formwork 2 is added between the outer formwork 12 and the middle section formwork 11 of the internal formwork system 1. The variable cross-section compensation formwork 2 is connected to the middle section formwork 11 and supports the outer formwork 12. Side formwork compensation formwork 3 is installed at the bends of the outer formwork 12, enabling the internal formwork system 1 to adapt to the casting of the variable cross-section immersed tube 4. This allows for rapid assembly into an internal formwork structure system conforming to the full cross-section of the variable cross-section immersed tube 4, solving a series of problems such as poor versatility, high assembly difficulty, and low efficiency of existing internal formwork. It improves the universal applicability of variable cross-section tube section formwork and standard tube section formwork. Furthermore, this embodiment solves the problem that existing internal formwork is not suitable for casting irregularly shaped immersed tube sections, providing a low-cost, flexible formwork usage solution. This combined internal formwork, which can be applied to the casting of various specifications of sections by adding a small number of components, has great potential for widespread adoption.

[0072] like Figures 2-15 As shown, the intermediate section template 11 includes an inner mold top mold 111, an inner mold truss 112 and an inner mold support leg 113 connected from top to bottom.

[0073] The variable cross-section compensation template 2 includes several compensation blocks, each of which includes a compensation top formwork, a compensation truss, and a compensation support leg connected sequentially from top to bottom;

[0074] One side of the compensating top formwork is connected to the inner top formwork 111, one side of the compensating truss is connected to the inner truss 112, the compensating leg and the inner leg 113 are arranged side by side, and the other side of the compensating top formwork is hinged to the outer template 12. The other side of the compensating truss and the other side of the compensating leg support the outer template 12.

[0075] By connecting the compensation block with the intermediate section template 11, the compensation block and the intermediate section template 11 are integrated to change the cross-sectional shape of the inner template system 1. At the same time, the compensation block supports the outer template 12, enabling the outer template 12 to be used normally. Furthermore, the compensation block, by combining with the inner template system 1 to form an integral whole, provides a support platform for concrete pouring. The compensation legs provide vertical support for the upper compensation top formwork, transferring the construction load generated by the concrete and pouring to the pouring platform or the bottom plate of the variable cross-section immersed tube 4.

[0076] In this embodiment, as Figures 3-15 As shown, the variable cross-section immersed tube 4 is divided into three segments from the small cross-section end to the large cross-section end, namely the first segment 41, the second segment 42, and the third segment 43. The variable cross-section compensation template 2 is correspondingly divided into the first compensation block 21, the second compensation block 22, and the third compensation block 23.

[0077] like Figures 4-7 As shown, along the length of the variable cross-section immersed tube 4, the first compensation block 21 is a wedge-shaped compensation block, set between the outer template 12 and the middle section template 11, so that the outer template 12 of the inner template system 1 is arranged at an inclination, thereby changing the cross-sectional shape of the inner template system 1, as shown. Figure 4 The first compensation block 21 includes a first compensation top mold 211, a first compensation truss 212, and a first compensation support leg 213 connected sequentially from top to bottom, as follows: Figure 6 After the first compensation block 21 is added between the outer template 12 and the middle section template 11, one side of the first compensation top mold 211 is connected to the inner mold top mold 111 of the middle section template 11, one side of the first compensation truss 212 is connected to the inner mold truss 112 of the middle section template 11, and the first compensation leg 213 is arranged side by side with the inner mold leg 113 of the middle section template 11. Figure 7 The other side of the first compensation top mold 211 is hinged to the outer template 12, and the other side of the first compensation truss 212 supports the outer template 12.

[0078] exist Figure 6 middle, Figure 6 a is a plan view of the first compensation block 21. Figure 6 b is a front view of the first compensation block 21.

[0079] like Figures 10-12 As shown, along the length of the variable cross-section immersed tube 4, the second compensation block 22 is a wedge-shaped compensation block, which is set between the outer template 12 and the middle section template 11, so that the outer template 12 of the inner template system 1 is arranged at an inclination, thereby changing the cross-sectional shape of the inner template system 1. The second compensation block 22 includes a second compensation top mold 221, a second compensation truss 222 and a second compensation leg 223 connected sequentially from top to bottom. After the second compensation block 22 is added between the outer template 12 and the middle section template 11, one side of the second compensation top mold 221 is connected to the inner mold top mold 111 of the middle section template 11, one side of the second compensation truss 222 is connected to the inner mold truss 112 of the middle section template 11, the second compensation leg 223 is arranged side by side with the inner mold leg 113 of the middle section template 11, the other side of the second compensation top mold 221 is hinged to the outer template 12, and the other side of the second compensation truss 222 supports the outer template 12.

[0080] exist Figure 12 middle, Figure 12 a is a plan view of the second compensation block 22. Figure 12 b is a front view of the second compensation block 22.

[0081] like Figures 13-15 As shown, along the length of the variable cross-section immersed tube 4, the third compensation block 23 is a trapezoidal compensation block, which is set between the outer template 12 and the middle section template 11, so that the outer template 12 of the inner template system 1 is arranged at an inclination, thereby changing the cross-sectional shape of the inner template system 1. The third compensation block 23 includes a third compensation top mold 231, a third compensation truss 232 and a third compensation leg 233 connected from top to bottom. After the third compensation block 23 is added between the outer template 12 and the middle section template 11, one side of the third compensation top mold 231 is connected to the inner mold top mold 111 of the middle section template 11, one side of the third compensation truss 232 is connected to the inner mold truss 112 of the middle section template 11, the third compensation leg 233 is arranged side by side with the inner mold leg 113 of the middle section template 11, the other side of the third compensation top mold 231 is hinged to the outer template 12, and the other side of the third compensation truss 232 supports the outer template 12.

[0082] exist Figure 15 middle, Figure 15 a is a plan view of the third compensation block 23. Figure 15 b is the front view of the third compensation block 23.

[0083] A preferred method, such as Figure 7 As shown, the compensation top mold is hinged to the inner mold top mold 111, and the compensation truss is bolted to the inner mold truss 112. By hinged to the compensation top mold and the inner mold top mold 111, and bolted to the compensation truss and the inner mold truss 112, the compensation block is firmly connected to the intermediate section template 11.

[0084] A preferred method, such as Figure 7 As shown, the top formwork of the compensation is hinged to the top of the outer formwork 12, and the compensation truss is connected to the lower part of the outer formwork 12 through hydraulic rods. Since the top formwork of the compensation is hinged to the top of the outer formwork 12, the outer formwork 12 can rotate around the top formwork of the compensation. The compensation truss is connected to the lower part of the outer formwork 12 through hydraulic rods, so that the compensation truss supports the outer formwork 12 through hydraulic rods. During construction, the extension and retraction of the hydraulic rods are controlled to control the retraction and expansion of the outer formwork 12.

[0085] like Figure 1 , Figure 3 As shown, since the variable cross-section immersed tube 4 has a variable cross-section section, the outer formwork 12 of the inner formwork system 1 has a corresponding bend to accommodate the variable cross-section section of the variable cross-section immersed tube 4.

[0086] like Figure 4 and Figure 8 , Figure 13 , Figure 16 As shown, the outer template 12 includes a first straight segment template 121, a second inclined segment template 122 and a third straight segment template 123 that are sequentially adjacent to each other;

[0087] The side mold compensation template 3 includes a first side module 31 and a second side module 32. The first side module 31 is located at the bend between the first straight segment template 121 and the second inclined segment template 122, and the second side module 32 is located at the bend between the second inclined segment template 122 and the third straight segment template 123.

[0088] like Figure 3 As shown, by setting the side formwork compensation template 3 at the bend of the outer formwork 12, the outer formwork 12 can form a side formwork with an inclined side to adapt to the cross-sectional shape of the inner formwork system 1 after the addition of the variable cross-section compensation template 2.

[0089] A preferred method, such as Figure 4 , Figure 8 , Figure 9 As shown, when constructing the combined inner formwork of the first segment 41 of the variable cross-section immersed tube 4, the first side module 31 is set between the first straight section formwork 121 and the second inclined section formwork 122. The first side module 31 includes a first wedge block 311 and a first rectangular block 312. The inclined side of the first wedge block 311 is connected to the first rectangular block 312.

[0090] The side of the first wedge-shaped block 311 away from the first rectangular block 312 is connected to the first straight segment template 121, and the side of the first rectangular block 312 away from the first wedge-shaped block 311 is connected to the second inclined segment template 122.

[0091] like Figure 4 As shown, by setting a first side module 31 between the first straight section template 121 and the second inclined section template 122, the outer template 12 can smoothly transition at the bend of the first section immersed tube 41, so as to adapt to the side of the combined inner template of the first section immersed tube 41 changing from a straight surface to an inclined surface.

[0092] exist Figure 9 middle, Figure 9 a is a front view of the first wedge block 311. Figure 9 b is the front view of the first rectangular block 312.

[0093] A preferred method, such as Figure 13 , Figure 16 , Figure 17As shown, when constructing the combined inner formwork of the third segment 43 of the variable cross-section immersed tube 4, the second side module 32 is set between the second inclined section formwork 122 and the third straight section formwork 123. The second side module 32 includes a second rectangular block 321, a second wedge block 322 and a third rectangular block 323 connected in sequence. The inclined side of the second wedge block 322 is connected to the second rectangular block 321, and the side of the second wedge block 322 away from the inclined side is connected to the third rectangular block 323.

[0094] The side of the second rectangular block 321 away from the second wedge block 322 is connected to the second inclined segment template 122, and the side of the third rectangular block 323 away from the second wedge block 322 is connected to the third straight segment template 123.

[0095] By setting a second side module 32 between the second inclined section template 122 and the third straight section template 123, the outer template 12 can smoothly transition at the bend of the third section immersed tube 43, so as to adapt to the side of the combined inner template of the third section immersed tube 43 changing from an inclined surface to a straight surface.

[0096] exist Figure 17 middle, Figure 17 a is the front view of the second rectangular block 321. Figure 17 b is the front view of the second wedge block 322. Figure 17 c is the front view of the third rectangular block 323.

[0097] Example 2

[0098] like Figures 3-20 As shown, this embodiment discloses a construction method for a combined internal formwork for casting variable cross-section immersed tubes. Using the combined internal formwork as described in Embodiment 1, the method further includes the following steps:

[0099] S1: Divide the variable cross-section immersed tube 4 into three segments from the small cross-section end to the large cross-section end, namely the first segment immersed tube 41, the second segment immersed tube 42 and the third segment immersed tube 43. The variable cross-section compensation template 2 is correspondingly divided into the first compensation block 21, the second compensation block 22 and the third compensation block 23. The side formwork compensation template 3 includes the first side module 31 and the second side module 32.

[0100] Before pouring the first segment of the immersed tube 41, the inner formwork system 1 is disassembled, and then the first compensation block 21 is assembled between the outer formwork 12 and the middle section formwork 11. The first side module 31 is installed at the bend of the outer formwork 12 inside the first segment of the immersed tube 41, so that the inner formwork system 1, the first compensation block 21 and the first side module 31 are assembled into a whole, and then the first segment of the immersed tube 41 is poured.

[0101] S2: After S1 is completed, the inner template system 1 and the first compensation block 21 are disassembled, the first compensation block 21 and the first side module 31 are removed, and then disassembled and transported away from the site.

[0102] S3: Before pouring the second segment of the immersed tube 42, assemble the second compensation block 22 between the outer template 12 and the middle template 11, so that the inner template system 1 and the second compensation block 22 are assembled into a whole, and then pour the second segment of the immersed tube 42.

[0103] S4: After S3 is completed, the inner template system 1 and the second compensation block 22 are disassembled, the second compensation block 22 is removed and disassembled and transported away from the site.

[0104] S5: Before pouring the third section of the immersed tube 43, assemble the third compensation block 23 between the outer template 12 and the middle section template 11, and install the second side module 32 at the bend of the outer template 12 inside the third section of the immersed tube 43, so that the inner template system 1, the third compensation block 23 and the second side module 32 are assembled into a whole, and then pour the third section of the immersed tube 43.

[0105] S6: After S5 is completed, the inner template system 1 and the third compensation block 23 are disassembled, the third compensation block 23 and the second side module 32 are removed, and then disassembled and transported away from the site.

[0106] A preferred method, such as Figure 21 As shown, during the casting stage of the bottom plate and wall of the variable cross-section immersed tube 4, the top formwork of each compensation block is connected to the top formwork of the inner formwork 111, and the compensation truss is connected to the inner formwork truss 112. That is, during the casting stage of the bottom plate and wall of the immersed tube 4, only the top formwork and the compensation truss are used for support and stress.

[0107] A preferred method, such as Figure 22 As shown, during the top slab pouring stage of the variable cross-section immersed tube 4, compensation legs are installed on the bottom slab of the immersed tube. The compensation legs are connected to the bottom of the compensation truss. That is, during the top slab pouring stage of the immersed tube 4, compensation legs are installed on the bottom slab of the immersed tube. The compensation legs are connected to the bottom of the compensation truss. The compensation legs bear the load generated by the compensation block itself and the poured concrete.

[0108] 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 combined inner formwork for casting variable cross-section immersed tubes, characterized in that, It includes an internal formwork system (1) and a variable cross-section compensation formwork (2); The inner template system (1) includes a middle section template (11), and the middle section template (11) is provided with an outer template (12) and an inner template (13) at both ends; One side of the variable cross-section compensation template (2) is connected to the middle section template (11), and the other side of the variable cross-section compensation template (2) can support the outer template (12); It also includes a side mold compensation template (3), which is disposed at the bend of the outer template (12); The outer template (12) includes a first straight segment template (121), a second inclined segment template (122), and a third straight segment template (123) that are sequentially adjacent to each other; The side mold compensation template (3) includes a first side module (31) and a second side module (32). The first side module (31) is disposed between the first straight segment template (121) and the second inclined segment template (122), and the second side module (32) is disposed between the second inclined segment template (122) and the third straight segment template (123). The first side module (31) includes a first wedge block (311) and a first rectangular block (312), and the inclined side of the first wedge block (311) is connected to the first rectangular block (312); The second side module (32) includes a second rectangular block (321), a second wedge block (322) and a third rectangular block (323) connected in sequence. The inclined side of the second wedge block (322) is connected to the second rectangular block (321), and the side of the second wedge block (322) away from the inclined side is connected to the third rectangular block (323).

2. The combined inner formwork for variable cross-section immersed tube casting according to claim 1, characterized in that, The intermediate section template (11) includes an inner mold top mold (111), an inner mold truss (112), and an inner mold support leg (113) connected from top to bottom; The variable cross-section compensation template (2) includes several compensation blocks, each of which includes a compensation top formwork, a compensation truss and a compensation support leg connected sequentially from top to bottom; One side of the compensation top mold is connected to the inner top mold (111), one side of the compensation truss is connected to the inner truss (112), the compensation leg is arranged side by side with the inner truss leg (113), and the other side of the compensation top mold is hinged to the outer template (12), and the other side of the compensation truss supports the outer template (12).

3. A combined inner formwork for casting variable cross-section immersed tubes according to claim 2, characterized in that, The compensation top mold is hinged to the inner mold top mold (111), and the compensation truss is bolted to the inner mold truss (112).

4. A combined inner formwork for casting variable cross-section immersed tubes according to claim 3, characterized in that, The compensation top mold is hinged to the top of the outer template (12), and the compensation truss is connected to the lower part of the outer template (12) through a hydraulic rod.

5. A combined inner formwork for casting variable cross-section immersed tubes according to claim 1, characterized in that, The side of the first wedge block (311) away from the first rectangular block (312) is connected to the first straight segment template (121), and the side of the first rectangular block (312) away from the first wedge block (311) is connected to the second inclined segment template (122).

6. A combined inner formwork for variable cross-section immersed tube casting according to claim 1, characterized in that, The side of the second rectangular block (321) away from the second wedge block (322) is connected to the second inclined segment template (122), and the side of the third rectangular block (323) away from the second wedge block (322) is connected to the third straight segment template (123).

7. A method for constructing a combined internal formwork for casting variable cross-section immersed tubes, characterized in that, Using the combined inner template as described in any one of claims 1-6, the method further includes the following steps: S1: Divide the variable cross-section immersed tube (4) into three segments from the small cross-section end to the large cross-section end, namely the first segment immersed tube (41), the second segment immersed tube (42), and the third segment immersed tube (43). The variable cross-section compensation template (2) is correspondingly divided into the first compensation block (21), the second compensation block (22), and the third compensation block (23). The side formwork compensation template (3) includes the first side module (31) and the second side module (32). Before pouring the first segment of the immersed tube (41), the inner template system (1) is disassembled, and then the first compensation block (21) is assembled between the outer template (12) and the middle section template (11). The first side module (31) is installed at the bend of the outer template (12) inside the first segment of the immersed tube (41), so that the inner template system (1), the first compensation block (21) and the first side module (31) are assembled into a whole, and then the first segment of the immersed tube (41) is poured. S2: After S1 is completed, the inner template system (1) and the first compensation block (21) are disassembled, the first compensation block (21) and the first side module (31) are removed, and then disassembled and transported away from the site. S3: Before pouring the second segment of the immersed tube (42), assemble the second compensation block (22) between the outer template (12) and the middle section template (11) so that the inner template system (1) and the second compensation block (22) are assembled into a whole, and then pour the second segment of the immersed tube (42). S4: After S3 is completed, the inner template system (1) and the second compensation block (22) are disassembled, the second compensation block (22) is removed and disassembled and transported away from the site; S5: Before pouring the third segment of the immersed tube (43), assemble the third compensation block (23) between the outer template (12) and the middle section template (11), and install the second side module (32) at the bend of the outer template (12) inside the third segment of the immersed tube (43), so that the inner template system (1), the third compensation block (23) and the second side module (32) are assembled into a whole, and then pour the third segment of the immersed tube (43); S6: After S5 is completed, the inner template system (1) and the third compensation block (23) are disassembled, the third compensation block (23) and the second side module (32) are removed, and then disassembled and transported away from the site.

8. A method for constructing a combined internal formwork for casting variable cross-section immersed tubes according to claim 7, characterized in that, During the stage of casting the bottom plate and wall of the variable cross-section immersed tube (4), the compensation top mold of each compensation block is connected to the inner top mold (111), and the compensation truss is connected to the inner truss (112).

9. A method for constructing a combined internal formwork for casting variable cross-section immersed tubes according to claim 8, characterized in that, During the top slab stage of casting the variable cross-section immersed tube (4), compensation legs are installed on the bottom slab of the immersed tube, and the compensation legs are connected to the bottom of the compensation truss.

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