A spliced formwork convenient to install for cast-in-situ box girder construction

Abstract

The present application relates to the field of box girder form, specifically discloses a spliced form convenient to install for cast-in-place box girder construction, which comprises a first cast-in-place mold and a second cast-in-place mold, and the inner side walls of the first cast-in-place mold and the second cast-in-place mold are provided with inner forms, the inner forms comprise: a top box girder form, a spliced form, and a bottom pouring form, the upper surface of the bottom pouring form is provided with spliced insertion slots in an array, the outer side walls of the top box girder form, the spliced form, and the bottom pouring form are provided with first support grooves, and the rear surface of the bottom pouring form downwardly from the first support grooves is provided with rotating ear plates. After the spliced frame and the support frame are spliced, the first cast-in-place mold and the second cast-in-place mold are respectively placed symmetrically outside the four inner forms for limiting, then the spliced form and the corresponding spliced frame of each layer are installed and supported when being segmented, and then segmented pouring is carried out, so that the construction mode of the box girder is flexible.

Description

Technical Field

[0001] This invention relates to the field of box girder formwork, specifically a splicing formwork for cast-in-place box girder construction that is easy to install. Background Technology

[0002] Reinforced concrete box girders are divided into precast box girders and cast-in-place box girders. Precast box girders, fabricated on an independent site, can be erected after the substructure is completed using a bridge erection machine, accelerating the project and saving time. Cast-in-place box girders are mostly used in large continuous bridges. Commonly, they are classified by material into two main types: prestressed reinforced concrete box girders and steel box girders. Prestressed reinforced concrete box girders are constructed on-site, and in addition to longitudinal prestressing, some also have transverse prestressing. Steel box girders are generally fabricated in a factory and then transported to the site for installation. Some are entirely steel structures, while others have a reinforced concrete pavement layer. Steel box girders, also called steel plate box girders, are a commonly used structural form for long-span bridges. They are generally used on bridges with large spans and resemble a box in shape, hence the name steel box girder. Steel plate box girders are a commonly used structural form in engineering. To study the influence of diaphragm spacing on the distortion of simply supported steel box girders under concentrated loads, simply supported steel box girders with different numbers of diaphragms were used.

[0003] However, since most of the formwork in cast-in-place box girders on the market is fixed as a single unit, different formwork needs to be replaced when pouring the foundation and the beam, which makes construction inconvenient. Summary of the Invention

[0004] To address the existing problems, this invention provides an easy-to-install splicing formwork for cast-in-place box girder construction. This device, when used in conjunction with other methods, can effectively solve the problems mentioned in the background art.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A modular formwork for easy installation in cast-in-place box girder construction includes a first cast-in-place mold and a second cast-in-place mold. Both the first and second cast-in-place molds have inner formwork on their inner sidewalls. The inner formwork includes a top box girder formwork, a splicing formwork, and a bottom casting formwork. The upper surface of the bottom casting formwork has an array of splicing slots. The lower surface of the splicing formwork has splicing rods installed corresponding to the positions of the splicing slots. The outer sidewalls of the top box girder formwork, the splicing formwork, and the bottom casting formwork are all equipped with first support grooves. The first support grooves are located downwards from the... A rotating ear plate is installed on the rear surface of the bottom casting template. A telescopic rod is connected inside the rotating ear plate through a rotating shaft. A ratchet gear is installed at one end of the rotating shaft on the outside of the rotating ear plate. A pawl is connected above the ratchet gear through an elastic rotating shaft. A support frame is provided at the lower end of the first cast-in-place mold. A splicing frame is installed in an array above the support frame. A lower insertion rod is installed at the lower end of the splicing frame. An upper slot is opened below the lower insertion rod at the upper end of the support frame. A threaded connecting hole is opened on the outer side of the upper end of the support frame. A splicing screw is installed inside the threaded connecting hole.

[0007] As a further embodiment of the present invention: the side surfaces of the support frame and the splicing frame are provided with a second support groove, and a connecting rod is connected between the second support groove and the first support groove.

[0008] As a further embodiment of the present invention: an upper connecting pad is installed below the rear surface of the splicing template, and a lower connecting pad is installed below the upper connecting pad on the rear surface of the bottom casting template, and a fixing screw is connected between the lower connecting pad and the upper connecting pad.

[0009] As a further embodiment of the present invention: a top cover plate is installed above the splicing frame, a support pad is installed at the lower end of the telescopic rod, and a box beam is provided between the first cast-in-place mold and the second cast-in-place mold.

[0010] As a further embodiment of the present invention: the ratchet gear is fixedly connected to the rotating shaft, and the splicing template is engaged with the splicing slot through the splicing insert rod.

[0011] As a further embodiment of the present invention: the splicing frame and the lower insert rod are engaged with the upper slot, and the splicing screw is engaged with the threaded connecting hole and the lower insert rod.

[0012] As a further embodiment of the present invention: threaded holes are arrayed inside both the second support groove and the first support groove, and threaded posts are installed at both ends of the connecting rod.

[0013] As a further embodiment of the present invention: the fixing screw is engaged with the upper connecting pad and the lower connecting pad.

[0014] As a further embodiment of the present invention: the box girder is provided with a reinforcing steel cage inside, and the box girder is integrally formed by cast-in-place concrete.

[0015] As a further embodiment of the present invention: the rotating ear plate is fixed to the bottom casting template by welding, and the supporting pad is movably connected to the telescopic rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The thickness of the splicing template and the bottom pouring template are the same. When splicing, the splicing rod is inserted into the splicing slot for lateral positioning. Then, the upper connecting plate and the lower connecting plate are engaged and connected with the fixing screw for longitudinal positioning. This reduces the gap size at the splicing position of the splicing template and the bottom pouring template, ensuring the appearance size of the box girder after pouring.

[0018] 2. After disconnecting the limit lock of the pawl and ratchet, rotate the telescopic rod through the pivot to adjust its extension. Then, make the support plate at the end of the telescopic rod contact the foundation to support the bottom pouring template. Pour concrete into the space enclosed by the four bottom pouring templates. After the concrete poured at the bottom is formed, multiple splicing templates can be spliced ​​upwards to ensure the quick installation and disassembly of the mold.

[0019] 3. After assembling multiple splicing frames and support frames, the first and second cast-in-place molds are symmetrically placed on the outside of the four inner templates for positioning. Then, the inner templates can be cast as a whole. Alternatively, the splicing templates and corresponding splicing frames of each layer can be installed in sections before segmented casting, which flexibly improves the construction method of the box girder. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a splicing formwork for easy installation in the construction of cast-in-place box girders;

[0021] Figure 2 This is a schematic diagram of the structure of the first cast-in-place mold in a splicing formwork for easy installation in the construction of cast-in-place box girders;

[0022] Figure 3 This is a schematic diagram of the casting formwork in a spliced ​​formwork system for easy installation in the construction of cast-in-place box girders;

[0023] Figure 4 An exploded view of the casting formwork and splicing formwork in a type of easy-to-install splicing formwork for cast-in-place box girder construction;

[0024] Figure 5 This is a partial enlarged view of the bottom casting formwork in a spliced ​​formwork type that is easy to install for the construction of cast-in-place box girders;

[0025] Figure 6 An exploded view of the support frame in a spliced ​​formwork for easy installation in the construction of cast-in-place box girders;

[0026] Figure 7 This is a side view of a cast-in-place mold in a spliced ​​formwork system for easy installation during the construction of cast-in-place box girders.

[0027] Figure 8 This is a magnified view of the splicing formwork and support frame in a splicing formwork system for easy installation in the construction of cast-in-place box girders.

[0028] In the diagram: 1. First cast-in-place mold; 2. Second cast-in-place mold; 3. Box girder; 4. Inner formwork; 101. Top cover plate; 102. Support frame; 103. Top box girder formwork; 104. Splicing formwork; 105. Bottom casting formwork; 106. First support groove; 107. Rotating ear plate; 108. Telescopic rod; 109. Support pad; 110. Ratchet; 111. Pawl; 112. Splicing slot; 113. Splicing insert rod; 114. Fixing screw; 115. Upper connecting pad; 116. Lower connecting pad; 1021. Splicing frame; 1022. Second support groove; 1023. Upper slot; 1024. Lower insert rod; 1025. Splicing screw; 1026. Threaded connecting hole; 1027. Connecting rod. Detailed Implementation

[0029] The present invention will be further described below with reference to specific inventions. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0030] In the description of this specification, references to terms such as "this embodiment," "some embodiments," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example, and the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] like Figure 1-8As shown, this embodiment provides an easy-to-install splicing formwork for cast-in-place box girder construction, including a first cast-in-place mold 1 and a second cast-in-place mold 2. Both the first and second cast-in-place molds 1 and 2 have inner formwork 4s on their inner sidewalls. The inner formwork 4 includes a top box girder formwork 103, a splicing formwork 104, and a bottom casting formwork 105. The upper surface of the bottom casting formwork 105 has an array of splicing slots 112. The lower surface of the splicing formwork 104 has splicing rods 113 installed corresponding to the positions of the splicing slots 112. The splicing formwork 104 is engaged with the splicing slots 112 via the splicing rods 113. The outer sidewalls of the top box girder formwork 103, the splicing formwork 104, and the bottom casting formwork 105 are all equipped with first support grooves 106. A rotating ear plate 107 is installed on the rear surface of the bottom casting formwork 105, pointing downwards from the first support groove 106. The rotating ear plate 107 is connected to the bottom casting formwork... 105 is fixed by welding. A telescopic rod 108 is connected inside the rotating ear plate 107 via a rotating shaft. A ratchet 110 is mounted on the outer side of the rotating ear plate 107 at one end of the rotating shaft. The ratchet 110 is fixedly connected to the rotating shaft. A pawl 111 is connected above the ratchet 110 via an elastic rotating shaft. A support frame 102 is provided at the lower end of the first cast-in-place mold 1. An array of splicing frames 1021 is installed above the support frame 102. The lower end is equipped with a lower insertion rod 1024. Below the lower insertion rod 1024, an upper slot 1023 is provided at the upper end of the support frame 102. The splicing frame 1021, the lower insertion rod 1024, and the upper slot 1023 are engaged. A threaded connecting hole 1026 is provided on the outer side of the upper end of the support frame 102. A splicing screw 1025 is installed inside the threaded connecting hole 1026. The splicing screw 1025 is engaged with the threaded connecting hole 1026 and the lower insertion rod 1024.

[0032] like Figure 2-7 As shown, in this embodiment, the side surfaces of the support frame 102 and the splicing frame 1021 are provided with a second support groove 1022. A connecting rod 1027 connects the second support groove 1022 and the first support groove 106. Threaded holes are arrayed inside both the second support groove 1022 and the first support groove 106. Threaded posts are installed at both ends of the connecting rod 1027. An upper connecting pad 115 is installed below the rear surface of the splicing template 104. A lower connecting pad is installed below the upper connecting pad 115 on the rear surface of the bottom casting template 105. A fixing screw 114 is connected between the lower connecting pad 116 and the upper connecting pad 115 of the plate 116. The fixing screw 114 is engaged with the upper connecting pad 115 and the lower connecting pad 116. A top cover plate 101 is installed above the splicing frame 1021. A support pad 109 is installed at the lower end of the telescopic rod 108. The support pad 109 is movably connected with the telescopic rod 108. A box beam 3 is set between the first cast-in-place mold 1 and the second cast-in-place mold 2. A reinforcing steel cage is set inside the box beam 3. The box beam 3 is integrally formed by cast-in-place concrete.

[0033] The working principle of this invention is as follows: When pouring the box girder 3, after drilling and pouring concrete piles at the foundation location, the bottom pouring templates 105 at the lower ends of the first cast-in-place mold 1 and the second cast-in-place mold 2 are spliced ​​on the foundation. After the limit lock of the control disconnect pawl 111 and ratchet 110 is engaged, the telescopic rod 108 is rotated through the rotating shaft. After the telescopic rod 108 is extended, the support pad 109 at the end of the telescopic rod 108 contacts the foundation location to support the bottom pouring template 105. Then, concrete is poured into the space enclosed by the four bottom pouring templates 105. After the concrete poured at the bottom position is formed, the telescopic rod 108 is retracted and rotated towards the rotating ear. The plate 107 is folded and retracted, and the four support frames 102 are placed on the outside of the four bottom casting templates 105 respectively. After the connecting rod 1027 is engaged and fixed with the second support groove 1022 and the first support groove 106 on the outside of the support frame 102, the splicing template 104 is installed on top of the bottom casting template 105. The thickness of the splicing template 104 and the bottom casting template 105 is the same. During splicing, after the splicing rod 113 is inserted into the splicing slot 112 for lateral positioning, the upper connecting pad 115 and the lower connecting pad 116 are engaged and connected with the fixing screw 114 for longitudinal positioning, thereby lowering the splicing template 104 and the bottom casting template. The gap size at the splicing position of 105 ensures the appearance dimensions of the cast box girder 3. After the splicing rods 113 on the lower surface of the splicing template 104 are inserted into the splicing slots 112, the fixing screws 114 are inserted into the upper connecting pad 115 and the lower connecting pad 116 respectively for engagement and fixation. This achieves the fixation of the splicing template 104 and the bottom casting template 105. Similarly, a corresponding number of splicing templates 104 are installed on the upper end of the splicing template 104 according to the height of the cast box girder 3. At the same time, after placing the splicing frame 1021 above the support frame 102, the lower rods 1024 are inserted into the upper slots 1023 on the upper surface of the support frame 102 to connect the splicing template 104. After the connecting screw 1025 is inserted into the threaded connecting hole 1026, it is limited by the corresponding lower insert rod 1024. Then, multiple splicing frames 1021 are installed upwards to support multiple splicing templates 104. Therefore, it is possible to cast box girders 3 of different heights. When casting the box girder 3, multiple splicing templates 104 and bottom casting templates 105 can be assembled into an inner template 4. After the four inner templates 4 are spliced, multiple splicing frames 1021 and support frames 102 are spliced ​​together. After the first cast-in-place mold 1 and the second cast-in-place mold 2 are symmetrically placed on the outside of the four inner templates 4 for limitation, the inner templates 4 can be cast integrally into shape.After the internal box girder 3 has been solidified as a whole, the first cast-in-place mold 1, the second cast-in-place mold 2, and the inner formwork 4 are disassembled. Simultaneously, supports can be installed and installed for each layer's splicing formwork 104 and corresponding splicing frames 1021 before segmented casting.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0036] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A modular formwork for easy installation in cast-in-place box girder construction, comprising a first cast-in-place mold (1) and a second cast-in-place mold (2), characterized in that, The inner walls of the first cast-in-place mold (1) and the second cast-in-place mold (2) are provided with inner templates (4). The inner templates (4) include: a top box girder template (103), a splicing template (104), and a bottom casting template (105). The upper surface of the bottom casting template (105) is provided with an array of splicing slots (112). The lower surface of the splicing template (104) is provided with splicing rods (113) corresponding to the position of the splicing slots (112). The outer walls of the top box girder template (103), the splicing template (104), and the bottom casting template (105) are all provided with first support grooves (106). The first support groove (106) is provided with a rotating ear plate (107) on the rear surface of the bottom casting template (105) below it. (107) has a telescopic rod (108) connected inside by a rotating shaft. One end of the rotating shaft is located outside the rotating ear plate (107) and a ratchet gear (110) is installed. A pawl (111) is connected above the ratchet gear (110) by an elastic rotating shaft. A support frame (102) is provided at the lower end of the first cast-in-place mold (1). A splicing frame (1021) is arranged in an array above the support frame (102). A lower insertion rod (1024) is installed at the lower end of the splicing frame (1021). An upper slot (1023) is opened below the lower insertion rod (1024) at the upper end of the support frame (102). A threaded connecting hole (1026) is opened on the outer side of the upper end of the support frame (102). A splicing screw (1025) is installed inside the threaded connecting hole (1026).

2. The easily installable splicing formwork for cast-in-place box girder construction according to claim 1, characterized in that, The side surfaces of the support frame (102) and the splicing frame (1021) are provided with a second support groove (1022), and a connecting rod (1027) is connected between the second support groove (1022) and the first support groove (106).

3. The easily installable splicing formwork for cast-in-place box girder construction according to claim 1, characterized in that, An upper connecting pad (115) is installed below the rear surface of the splicing template (104), and a lower connecting pad (116) is installed below the upper connecting pad (115) on the rear surface of the bottom casting template (105). A fixing screw (114) connects the lower connecting pad (116) and the upper connecting pad (115).

4. The easily installable splicing formwork for cast-in-place box girder construction according to claim 1, characterized in that, A top cover plate (101) is installed above the splicing frame (1021), a support pad plate (109) is installed at the lower end of the telescopic rod (108), and a box beam (3) is provided between the first cast-in-place mold (1) and the second cast-in-place mold (2).

5. The easily installable splicing formwork for cast-in-place box girder construction according to claim 1, characterized in that, The ratchet (110) is fixedly connected to the rotating shaft, and the splicing template (104) is engaged with the splicing slot (112) through the splicing plug (113).

6. The easily installable splicing formwork for cast-in-place box girder construction according to claim 1, characterized in that, The splicing frame (1021) is engaged with the upper slot (1023) by the lower insertion rod (1024) installed at its lower end, and the splicing screw (1025) is engaged with the threaded connecting hole (1026) and the lower insertion rod (1024).

7. The easily installable splicing formwork for cast-in-place box girder construction according to claim 2, characterized in that, Both the second support groove (1022) and the first support groove (106) have threaded holes arranged in an array inside, and both ends of the connecting rod (1027) are equipped with threaded posts.

8. The easily installable splicing formwork for cast-in-place box girder construction according to claim 3, characterized in that, The fixing screw (114) is engaged with the upper connecting pad (115) and the lower connecting pad (116).

9. A splicing formwork for easy installation in the construction of cast-in-place box girders according to claim 4, characterized in that, The box girder (3) is equipped with a steel reinforcement cage inside, and the box girder (3) is integrally formed by cast-in-place concrete.

10. A splicing formwork for easy installation in the construction of cast-in-place box girders according to claim 4, characterized in that, The rotating ear plate (107) is fixed to the bottom casting template (105) by welding, and the support pad (109) is movably connected to the telescopic rod (108).

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