Inner mold structure of ascending type movable mold frame

Abstract

The utility model relates to the technical field of bridge construction, in particular to an ascending type movable formwork inner formwork structure which comprises an inner formwork and a supporting frame. The inner formwork is composed of a top plate and a web plate and used for defining the final shape and size of a concrete structure. The supporting frame is connected with the inner formwork and comprises a plurality of standard cavity frames, gradual change cavity frames and end cavity frames, and the supporting frame is composed of a top frame and a belly frame and used for supporting the weight of the inner formwork and concrete, keeping the shape and position of the formwork and preventing the formwork from deforming and shifting; the inner template is formed by splicing a first inner template, a second inner template, a third inner template, a fourth inner template, a fifth inner template and a sixth inner template; the gradually-changing cavity frame comprises a first gradually-changing cavity frame, a second gradually-changing cavity frame, a third gradually-changing cavity frame and a fourth gradually-changing cavity frame. The number of the standard cavity frames is adjusted according to the length of the concrete beams, and the construction requirements of the concrete beams with different lengths are met.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to an upward-moving formwork inner mold structure. Background Technology

[0002] Internal formwork, also known as inner mold, is a temporary structure used in building and construction to create internal cavities or shapes within a concrete structure. Unlike external formwork, internal formwork is typically located inside the concrete structure and is used to create features such as hollow sections of bridges, hollow beams in floor slabs, or internal cavities in walls. Internal formwork is an indispensable part of concrete structure construction, and its quality directly affects the quality and safety of the final building. Therefore, during construction, internal formwork must be constructed strictly according to design requirements and regularly inspected and maintained to ensure construction quality and safety.

[0003] Chinese Patent Publication No. CN208346615U discloses an inner mold for a box girder, comprising an inner mold body assembled from a first template and a second template. The first and second templates are respectively composed of an upper template and a lower template hinged together. Vertical supports connect the upper and lower templates, including an upper support detachably connected to the upper template and a lower support detachably connected to the lower template. The upper and lower supports are hinged together by a first connector, allowing them to rotate around the first connector as a fulcrum under external force, thereby causing the upper and lower templates to open or close relative to each other. A second connector is also provided between the upper and lower supports for fixing them together when the upper and lower templates are open relative to each other. Therefore, the inner mold for the box girder has the following problems:

[0004] The poor versatility of the inner formwork makes it unsuitable for concrete beams of different lengths and shapes, limiting the scope of its use and increasing construction time and costs. Utility Model Content

[0005] To address this issue, this utility model provides an upward-moving formwork inner mold structure to overcome the problems of poor versatility of existing inner molds, their inability to adapt to concrete beams of different lengths and shapes, their limitation of formwork application range, and the increased construction time and cost.

[0006] To achieve the above objectives, this utility model provides an upward-moving mold frame inner mold structure, comprising:

[0007] Internal formwork, consisting of a top plate and a web plate, is used to define the final shape and dimensions of the concrete structure;

[0008] The support frame, which is connected to the inner formwork, includes several standard cavity frames, gradient cavity frames, and end cavity frames. The support frame consists of a top frame and a web frame. It is used to support the weight of the inner formwork and concrete until the concrete is fully solidified and can bear its own weight, as well as to maintain the shape and position of the formwork and prevent the formwork from deforming or shifting due to weight pressure during the concrete pouring process.

[0009] Furthermore, the inner template is composed of a first inner template, a second inner template, a third inner template, a fourth inner template, a fifth inner template, and a sixth inner template.

[0010] The gradient cavity frame includes a first gradient cavity frame, a second gradient cavity frame, a third gradient cavity frame, and a fourth gradient cavity frame.

[0011] Furthermore, the number of standard cavity frames is set to several, and the inner mold adopts a detachable inner mold structure. The number of standard cavity frames is determined according to the length of the construction concrete beam.

[0012] Furthermore, the top plate and the web plate are hinged together to form the inner template, the support frames are connected as a whole by pins and struts, and the inner template and the support frame are connected by bolts and washers.

[0013] Furthermore, when using the inner mold, a support block is set on the bottom straight section to support the bottom mold, and the support block and the support frame are on the same cross section.

[0014] Furthermore, the top frame is provided with two connection and installation positions: the top plate is removed when the top frame is placed in the lower installation position, and the top plate is installed when the top frame is placed in the upper installation position.

[0015] Furthermore, the top frame and the belly frame are provided with scaffolding pipe installation positions, and the connection between adjacent support frames is reinforced by the scaffolding pipes and fasteners.

[0016] Furthermore, the assembly gaps of the inner template are symmetrically located at the lower end of the web corner, and the inner template is tightened to the support frame by bolts to eliminate the assembly gap between the support frame and the inner template.

[0017] Furthermore, the camber of the inner formwork conforms to the characteristic curve value generated by the actual concrete load and the self-weight of the inner formwork on the main beam of the bridge-building machine, as well as the pre-camber required by the design.

[0018] Furthermore, the inner mold has an anti-arch at the mid-span position, with the rest of the mold transitioning smoothly.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] Furthermore, bridge construction involves various concrete beam lengths. The number of standard cavity frames is adjusted according to the concrete beam length to meet the construction needs of concrete beams of different lengths. The internal formwork is more flexible and adaptable, meeting the construction needs of various complex structures, reducing formwork waste and reuse, thereby improving construction efficiency and accuracy, ensuring that the beam size and shape meet design requirements, and reducing the possibility of later corrections and rework.

[0021] Furthermore, camber refers to the degree of upward bending of a concrete structure during the pouring process due to its own weight or other external forces. Appropriate camber can reduce tensile stress generated during concrete drying and shrinkage, thereby reducing crack formation; camber exceeding the design allowable range can affect the stability and safety of the structure and even lead to structural failure. By setting the camber of the inner formwork based on the characteristic curve value generated by the actual concrete load (including reinforcement) plus the self-weight of the inner formwork on the main beam of the bridge-building machine, and the pre-camber required by the design, the load-bearing capacity and overall performance of the structure can be improved.

[0022] Furthermore, setting an inverted arch at the mid-span can increase the bending stiffness of the concrete beam, thereby improving the overall load-bearing capacity and seismic performance of the structure. This makes the tensile stress on the upper surface and the compressive stress on the lower surface of the concrete beam more evenly distributed when it is under bending, which helps to reduce stress concentration and extend the service life of the structure. It also enhances the lateral stability of the concrete beam and reduces deformation and damage caused by lateral bending. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the inner template of the upward-moving mold frame inner mold structure in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the inner mold structure of the upward-moving mold frame in an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram showing the connection between the support frame and the inner template of the upward-moving mold frame inner mold structure in this embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the supporting frame of the inner mold structure of the upward-moving mold frame in this embodiment of the utility model;

[0027] Figure 5 This is a schematic diagram showing the connection between the top frame and the abdominal frame of the upward-moving mold frame inner mold structure in this embodiment of the utility model.

[0028] In the diagram: 1-First inner template, 2-Second inner template, 3-Third inner template, 4-Fourth inner template, 5-Fifth inner template, 6-Sixth inner template, 7-Standard cavity frame, 8-First gradient cavity frame, 9-Second gradient cavity frame, 10-Third gradient cavity frame, 11-Fourth gradient cavity frame, 12-End cavity frame, 13-Bolt, 14-Top plate, 15-Web plate. Detailed Implementation

[0029] To make the objectives and advantages of this utility model clearer, the utility model will be further described below with reference to the embodiments; it should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0030] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0031] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0032] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Please see Figures 1-5 As shown, Figure 1 This is a schematic diagram of the inner template of the upward-moving mold frame inner mold structure in an embodiment of this utility model; Figure 2 This is a schematic diagram of the inner mold structure of the upward-moving mold frame in an embodiment of this utility model; Figure 3 This is a schematic diagram showing the connection between the support frame and the inner template of the upward-moving mold frame inner mold structure in this embodiment of the utility model; Figure 4 This is a schematic diagram of the supporting frame of the inner mold structure of the upward-moving mold frame in this embodiment of the utility model; Figure 5 This is a schematic diagram showing the connection between the top frame and the abdominal frame of the upward-moving mold frame inner mold structure in an embodiment of this utility model.

[0034] This utility model provides an upward-moving mold frame inner mold structure, including:

[0035] The inner formwork is assembled from the first inner formwork 1, the second inner formwork 2, the third inner formwork 3, the fourth inner formwork 4, the fifth inner formwork 5, and the sixth inner formwork 6, and the inner formwork is composed of a top plate 14 and a web plate 15 that are hinged to each other, and is used to define the final shape and size of the concrete structure.

[0036] The support frame, which is connected to the inner formwork, includes a standard cavity frame 7, a gradient cavity frame, and an end cavity frame 12. The support frame consists of a top frame and a belly frame. It is used to support the weight of the inner formwork and concrete until the concrete is fully solidified and can bear its own weight, as well as to maintain the shape and position of the formwork and prevent the formwork from deforming or shifting due to weight pressure during the concrete pouring process.

[0037] The gradient cavity frame includes a first gradient cavity frame 8, a second gradient cavity frame 9, a third gradient cavity frame 10, and a fourth gradient cavity frame 11.

[0038] In this utility model, the inner mold system adopts a detachable inner mold structure. The inner mold design meets the requirements of 32-meter beams and also takes into account the prefabrication construction of 24-meter beams. The number of the standard cavity frames 7 is adjustable. The inner mold adopts a detachable inner mold structure, and the number of the standard cavity frames 7 is adjusted according to the length of the concrete beam.

[0039] The inner mold adopts a segmented design to fully consider the requirements of the inner mold exiting the cavity after the last beam is poured. The standard segment size of the inner mold is 1500mm×600mm×55mm.

[0040] Specifically, bridge construction involves various concrete beam lengths. The number of standard cavity frames 7 is adjusted according to the concrete beam length to meet the construction needs of concrete beams of different lengths. The internal formwork is more flexible and adaptable, meeting the construction needs of various complex structures, reducing formwork waste and reuse, thereby improving construction efficiency and accuracy, ensuring that the size and shape of the beam meet the design requirements, and reducing the possibility of later corrections and rework.

[0041] The top plate 14 and the web plate 15 are hinged to each other to form the inner template. The supporting frames are connected as a whole by pins and struts. Washers are provided between the inner template and the supporting frames. The inner template and the supporting frames are connected by bolts 13.

[0042] The inner template and the frame are connected by uniform drilled bolts 13; the materials of the inner template flange, longitudinal and transverse stiffeners, supporting frame and struts are joined by welding of equal strength; the assembly gap of the template is symmetrically located at the lower end of the corner of the web plate 15, and the bolts 13 are tightened to make the template and the frame fit tightly, eliminating the assembly gap between the frame and the template.

[0043] The camber setting should be based on the characteristic value of the curve generated by the actual concrete load including steel reinforcement plus the self-weight of the inner formwork and the pre-camber required by the design, so that the bridge curve after completion matches the design value; after the formwork is in place, the elevation should be adjusted to match the characteristic value of the pre-camber curve.

[0044] Specifically, camber refers to the degree of upward bending of a concrete structure during pouring due to its own weight or other external forces. Appropriate camber can reduce tensile stress generated during concrete drying and shrinkage, thereby reducing crack formation; however, camber exceeding the design allowable range can affect the stability and safety of the structure and even lead to structural failure. By setting the camber of the inner formwork based on the characteristic curve value generated by the actual concrete load (including reinforcement) plus the self-weight of the inner formwork on the main beam of the bridge-building machine, and the pre-camber required by the design, the load-bearing capacity and overall performance of the structure can be improved.

[0045] When using the inner formwork, support blocks are installed on the bottom straight section to support the bottom formwork. The support blocks and the support frame are on the same cross section to resist vertical loads. The inner formwork is arched at the mid-span position along with the bottom formwork, and the rest of the part transitions smoothly.

[0046] The inner formwork support frame is connected as a whole by pins and struts. The top frame has two connection and installation positions. When removing the top formwork, the top frame is placed in the lower installation position, and when installing the top plate 14, the top frame is placed in the upper installation position. The top frame and the web frame have reserved installation positions for scaffolding pipes. When using them, scaffolding steel pipes and fasteners should be used for reinforcement to ensure safety.

[0047] Specifically, setting an anti-arch at the mid-span can increase the bending stiffness of the concrete beam, thereby improving the overall load-bearing capacity and seismic performance of the structure. When the concrete beam is subjected to bending, the tensile stress on the upper surface and the compressive stress on the lower surface are more evenly distributed, which helps to reduce stress concentration and extend the service life of the structure. It also enhances the lateral stability of the concrete beam and reduces deformation and damage caused by lateral bending.

[0048] The specific sequence of assembly and disassembly of the inner membrane of this utility model is as follows:

[0049] Place the bottom corner formwork in the preset position, and assemble the support frame on the bottom corner formwork. Adjacent support frames should be firmly connected with scaffolding steel pipes and fasteners. When assembling the inner formwork, assemble it symmetrically from the bottom upwards, stopping at the corner of the upper part of the web plate 15. Then assemble it symmetrically from the middle of the top plate 14 to both sides, stopping at the corner of the web plate 15. The misalignment between adjacent formwork should be less than 2mm. After the inner formwork is fully assembled, the dimensional error range should be between +10mm and -5mm. Adjust the height of the support frame to the preset height and adjust the width of the support frame to the preset width. Check whether the center of the bottom opening of the inner formwork coincides with the center of the top opening, and whether the inner formwork is aligned with the outer formwork. After the concrete is poured, the inner formwork can be removed when the tensile strength is reached. When removing the inner formwork, first lower the top frame by 100mm and install it, and then remove the inner formwork and support frame in the reverse order of assembly. When removing the inner formwork, a temporary support can be made so that the top formwork can fall onto the temporary support to reduce the fall height of the top formwork and avoid damaging the concrete surface of the inner cavity.

[0050] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An upward-moving mold frame inner mold structure, characterized in that, include: Internal formwork, consisting of a top plate and a web plate, is used to define the final shape and dimensions of the concrete structure; The support frame, which is connected to the inner template, includes several standard cavity frames, gradient cavity frames, and end cavity frames. The support frame consists of a top frame and a belly frame, and is used to support the weight of the inner template and concrete until the concrete is fully solidified and can bear its own weight, as well as maintain the shape and position of the template.

2. The inner mold structure of the upward-moving mold frame according to claim 1, characterized in that, The inner template is composed of a first inner template, a second inner template, a third inner template, a fourth inner template, a fifth inner template, and a sixth inner template. The gradient cavity frame includes a first gradient cavity frame, a second gradient cavity frame, a third gradient cavity frame, and a fourth gradient cavity frame.

3. The inner mold structure of the upward-moving mold frame according to claim 1, characterized in that, The number of standard cavity frames is set to several, and the inner mold adopts a detachable inner mold structure. The number of standard cavity frames is determined according to the length of the construction concrete beam.

4. The inner mold structure of the upward-moving mold frame according to claim 1, characterized in that, The top plate and the web plate are hinged together to form the inner template. The supporting frames are connected as a whole by pins and struts. The inner template and the supporting frames are connected by bolts and washers.

5. The inner mold structure of the upward-moving mold frame according to claim 1, characterized in that, When using the inner mold, a support block is set on the bottom straight section to support the bottom mold. The support block and the support frame are on the same cross section.

6. The inner mold structure of the upward-moving mold frame according to claim 1, characterized in that, The top frame has two connection and installation positions. The top plate is removed when the top frame is placed in the lower installation position, and the top plate is installed when the top frame is placed in the upper installation position.

7. The inner mold structure of the upward-moving mold frame according to claim 1, characterized in that, The top frame and the belly frame are provided with scaffolding pipe installation positions, and the connection between adjacent support frames is reinforced by the scaffolding pipes and fasteners.

8. The inner mold structure of the upward-moving mold frame according to claim 1, characterized in that, The assembly gaps of the inner template are symmetrically located at the lower end of the corner of the web plate. The inner template is tightened to the support frame by bolts, eliminating the assembly gap between the support frame and the inner template.

9. The inner mold structure of the upward-moving mold frame according to claim 1, characterized in that, The camber of the inner formwork conforms to the characteristic curve value generated by the actual concrete load and the self-weight of the inner formwork on the main beam of the bridge-building machine, as well as the pre-camber required by the design.

10. The inner mold structure of the upward-moving mold frame according to claim 1, characterized in that, The inner mold has an inverted arch at the mid-span position, and the rest transitions smoothly.

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