Variable size inner formwork device suitable for municipal prefabricated inspection well

Abstract

The utility model provides a variable size inner mould device suitable for municipal prefabricated inspection well, including diameter adjusting mechanism, dynamic inner mould framework and inner mould limiting component, diameter adjusting mechanism includes adjusting assembly and sets up a plurality of connecting nodes at adjusting assembly outer periphery, each connecting node is always on same circle, is used for adjusting inner mould support diameter, the dynamic inner mould framework includes a plurality of arc frame bodies, each arc frame body is installed at each connecting node respectively, and the outer peripheral surface of each arc frame body is support mounting surface for installing support plate, the inner mould limiting component includes the limiting hole and limiting pin of being set up on each arc frame body and being vertically equal interval distribution, the limiting pin can select and cooperate with the limiting hole of different height, and forms the hanging limiting structure on the outside of arc frame body. The device is convenient for the inner mould assembly and disassembly when cast-in-situ concrete operation, can adapt to different model size, so that cast-in-situ concrete construction operation can spread.

Description

Technical Field

[0001] This utility model relates to the field of municipal pipeline construction technology, specifically to a variable-size inner mold device suitable for municipal prefabricated inspection wells. Background Technology

[0002] Inspection wells are an important component of municipal pipelines, designed to facilitate the maintenance and installation of underground urban infrastructure such as power supply, water supply, drainage, sewage, communications, cable television, gas pipes, and street light lines. They come in various forms and have a significant impact on urban functions, environmental protection, and people's lives. With the obsolescence of brick-built inspection well construction technology, precast concrete inspection wells are currently the most widely used construction technology. Their structure mainly consists of four parts: a well cover, a well shaft, a wellhead adjustment ring, and a well chamber. The well shaft and chamber are generally circular in structure.

[0003] During routine construction, due to the size limitations of precast components, a certain gap is unavoidable between the bottom of the manhole cover and the top of the manhole shaft. This gap is generally reinforced using concrete blocks or cast-in-place concrete to ensure construction quality.

[0004] However, in reality, workers often use brick masonry to raise the manhole cover for convenience. Due to its low structural strength and poor durability, the manhole cover will sink over time, affecting driving safety.

[0005] While cast-in-place concrete is superior in terms of performance, it involves formwork installation and reinforcement. The installation process of circular formwork is complex and involves working in confined spaces, which poses certain risks and results in a low utilization rate. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of existing technologies by providing a variable-size inner mold device suitable for municipal precast manholes, which facilitates the assembly and disassembly of inner molds during cast-in-place concrete operations, can adapt to different models and sizes, and enables the widespread application of cast-in-place concrete construction.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a variable-size inner mold device suitable for municipal prefabricated inspection wells, including a diameter adjustment mechanism, a dynamic inner mold skeleton, and an inner mold limiting component; The diameter adjustment mechanism includes an adjustment component and several connection nodes disposed on the outer periphery of the adjustment component. Each connection node is always on the same circle and is used to adjust the diameter of the inner mold support. The dynamic internal mold frame includes multiple arc-shaped frames, each arc-shaped frame is installed at each connection node, and the outer circumferential surface of each arc-shaped frame serves as a support mounting surface for installing support plates. The inner mold limiting component includes limiting holes and limiting pins that are vertically and equally spaced on each arc-shaped frame. The limiting pins can be selectively matched with limiting holes of different heights and form a supporting and limiting structure on the outside of the arc-shaped frame.

[0008] Based on the above, the adjustment assembly includes an inner support, an adjustment gear, an adjustment handle, and several movable racks; the movable racks are slidably engaged with the inner support so that the movable racks can slide along the length direction; the adjustment gear is rotatably mounted on the inner support and driven to rotate by the adjustment handle, and the adjustment gear meshes with each movable rack to drive each movable rack to move; When the adjusting gear rotates, it drives each movable rack to move inward or outward synchronously.

[0009] Based on the above, it includes four movable racks in pairs, with the two movable racks in a pair being parallel to each other and located on both sides of the adjusting gear, and the movable racks in different pairs being perpendicular to each other.

[0010] Based on the above, the inner support is provided with a rectangular guide hole corresponding to the movable rack, and the non-toothed part of the movable rack slides in cooperation with the guide hole to constrain the linear movement direction of the movable rack.

[0011] Based on the above, the movable rack is provided with a number of positioning holes, and positioning pins are fitted into the positioning holes. After the positioning pins are inserted into the positioning holes, they are constrained by the inner bracket or guide hole to prevent the movable rack from retracting to the center.

[0012] Based on the above, the arc-shaped frame is welded and fixed to the connecting node.

[0013] Based on the above, the number of the arc-shaped frames is four.

[0014] Based on the above, the adjusting handle is a T-shaped handle.

[0015] Based on the above, the inner support is a closed box with an outer shell.

[0016] Based on the above, the support plate is a flexible metal plate or a plastic plate.

[0017] This invention represents a substantial advancement over existing technologies. Specifically, it utilizes a diameter adjustment mechanism as the primary support frame, adapting to different manhole sizes through diameter adjustment. A dynamic inner mold skeleton is then externally installed, changing its support dimensions with the adjustment of the diameter mechanism. Its outermost layer is used to install support plates, forming a support surface and serving as the inner support structure for cast-in-place concrete. Since the cast-in-place area is located between the manhole cover and the manhole shaft, longitudinal fixation is challenging. Therefore, an inner mold limiting component is installed on the inner support structure. Limiting holes and pins are set on each arc-shaped frame. Based on the determined installation height, the limiting pins are inserted into the corresponding limiting holes and extend a certain distance to form a hanging limiting structure, which is then hung on the top of the manhole shaft below, thus achieving overall fixation of the inner support. This device solves the problem of installing and dismantling the inner mold during on-site casting of manholes of different sizes and heights, avoiding confined space operations, reducing installation and dismantling time, improving construction efficiency, and lowering construction costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a prefabricated municipal inspection well with a variable-size inner mold for adjusting the shaft, showing the contracted state.

[0019] Figure 2 This is a schematic diagram of the structure of a variable-size inner mold device for municipal prefabricated manholes in its unfolded state.

[0020] In the figure: 1. First arc-shaped frame; 2. Second arc-shaped frame; 3. Third arc-shaped frame; 4. Fourth arc-shaped frame; 5. Adjusting handle; 6. Movable rack; 7. Adjusting gear; 8. Support surface; 9. Inner support; 10. Guide hole; 11. Limit pin; 12. Limit hole; 13. Positioning hole; 14. Positioning pin. Detailed Implementation

[0021] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0022] During the construction of municipal stormwater and sewage inspection wells, the minimum prefabricated well cylinder height is generally 200mm. During construction, a gap of 50mm-200mm is unavoidable between the last section of the well cylinder and the well cover. This portion of the well cylinder needs to be cast on-site to ensure construction quality. The variable-size inner mold device for municipal prefabricated inspection wells disclosed in this utility model will be used as an example for explanation.

[0023] like Figure 1 and Figure 2 As shown, a variable-size inner mold device suitable for municipal prefabricated manholes includes a diameter adjustment mechanism, a dynamic inner mold skeleton, and an inner mold limiting component.

[0024] The diameter adjustment mechanism includes an adjustment component and several connection nodes disposed on the outer periphery of the adjustment component. Each connection node is always on the same circle and is used to adjust the diameter of the inner mold support.

[0025] Specifically, in this embodiment, the adjustment assembly includes an inner support 9, an adjustment gear 7, an adjustment handle 5, and several movable racks 6. The movable racks 6 are slidably engaged with the inner support 9 so that they can slide along their length. The adjustment gear 7 is rotatably mounted on the inner support 9 and driven to rotate by the adjustment handle 5. The adjustment gear 7 meshes with each movable rack 6 to drive each movable rack 6 to move. In this embodiment, four movable racks 6 are provided, distributed in pairs. The two movable racks 6 in a pair are parallel to each other and located on both sides of the adjustment gear 7. The movable racks in different pairs are perpendicular to each other. In this embodiment, a SHSS20×20×2 steel pipe is welded onto a frame, and 10×10 solid racks are fixed on the square pipe to form the movable racks.

[0026] When the adjusting gear 7 rotates, it drives each movable rack 6 to move inward or outward synchronously.

[0027] To ensure the stability of the movement of the movable rack 6, a rectangular guide hole 10 is provided on the inner support 9 corresponding to the movable rack 6. The non-toothed part of the movable rack 6 slides in conjunction with the guide hole 10 to constrain the linear movement direction of the movable rack, thus forming a motion guiding structure.

[0028] The movable rack 6 is provided with a plurality of positioning holes 13, and positioning pins 14 are fitted into the positioning holes 13. After the positioning pins 14 are inserted into the positioning holes 13, they are constrained by the inner bracket 9 or the guide hole 10 to prevent the movable rack 6 from retracting to the center.

[0029] In this embodiment, the inner support is a closed box with an outer shell, which can prevent foreign objects from entering the interior of the inner support and affecting the rotation of the gears.

[0030] The dynamic inner mold frame includes multiple arc-shaped frames. In this embodiment, it includes a first arc-shaped frame 1, a second arc-shaped frame 2, a third arc-shaped frame 3, and a fourth arc-shaped frame 4. Each arc-shaped frame is installed at a connection node. In this embodiment, it is fixed by welding. In other embodiments, it can also be installed by assembly for easy replacement. The outer circumferential surface of each arc-shaped frame 1 serves as a support mounting surface 8 for installing support plates. In this embodiment, an arc-shaped inner mold frame is welded from SHS20×20×2 square steel. A 2mm thick stainless steel plate is fixed on the frame as the inner mold. The stainless steel plate, as the inner mold, together with the square steel, has sufficient strength to support the concrete construction load and ensure the size of the adjustment well ring.

[0031] The inner mold limiting component includes limiting holes 12 and limiting pins 11 that are set on each arc-shaped frame and are vertically evenly distributed. The limiting pins 11 can be selectively matched with limiting holes 12 of different heights and form a supporting limiting structure on the outside of the arc-shaped frame. During installation, they are supported on the upper end face of the well barrel below to achieve vertical limiting of the entire device.

[0032] In a preferred embodiment, the adjusting handle 5 is a T-shaped handle for easy operation, and the support plate is a flexible metal or plastic sheet, which is usually detachably installed on the support mounting surface 8.

[0033] Brief description of the construction process: 1. Complete the installation and backfilling of prefabricated manholes, and install manhole covers and reinforcing steel cages for the manhole covers; 2. Install the aforementioned variable-size inner mold device suitable for municipal precast manholes: First, adjust the diameter adjustment mechanism to its minimum size, open the manhole cover, place the device in a suitable position, adjust the handle to open the inner mold, so that the inner mold is tightly attached to the inside of the lower manhole shaft; insert the positioning pin 14 to ensure that the inner mold size does not change during construction.

[0034] 3. Fixing the inner mold: After the vertical position of the inner mold is adjusted, insert the limiting pin 11 for fixing the inner mold vertically, and use the part of the limiting pin 11 that exceeds the limit to place the inner mold device on the lower well shaft. 4. Concrete pouring: After the inner formwork is installed and fixed, pour the concrete. 5. Inner formwork removal: After the concrete reaches the removal conditions, adjust the inner formwork size to the minimum by adjusting the handle, remove the inner formwork, clean the residual cement slurry on the inner formwork surface, and apply a release agent.

[0035] This solution is applicable to the on-site casting and installation of inner molds for manholes with diameters between 500mm and 900mm and heights below 250mm. It offers excellent dimensional and height adaptability. Through a variable-size inner mold device, it improves the installation quality of manhole covers, eliminates quality issues such as protrusions and depressions, increases construction efficiency, and reduces construction costs. The variable-size inner mold device eliminates the need for workers to enter the manhole to install the formwork, avoiding confined space operations and ensuring construction safety. This process is relatively simple; the variable-size inner mold device requires no additional machinery and can be installed and dismantled by a single person, making it convenient and easy to operate.

[0036] Finally, it should be noted that: the preferred embodiments of this patent have been described in detail above, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A variable-size inner mold device suitable for municipal prefabricated inspection wells, characterized in that: Includes a diameter adjustment mechanism, a dynamic inner mold skeleton, and an inner mold limiting assembly; The diameter adjustment mechanism includes an adjustment component and several connection nodes disposed on the outer periphery of the adjustment component. Each connection node is always on the same circle and is used to adjust the diameter of the inner mold support. The dynamic internal mold frame includes multiple arc-shaped frames, each arc-shaped frame is installed at each connection node, and the outer circumferential surface of each arc-shaped frame serves as a support mounting surface for installing support plates. The inner mold limiting component includes limiting holes and limiting pins that are vertically and equally spaced on each arc-shaped frame. The limiting pins can be selectively matched with limiting holes of different heights and form a supporting and limiting structure on the outside of the arc-shaped frame.

2. The variable-size inner mold device for municipal prefabricated inspection wells according to claim 1, characterized in that: The adjustment assembly includes an inner support, an adjustment gear, an adjustment handle, and several movable racks; the movable racks are slidably engaged with the inner support so that they can slide along the length direction; the adjustment gear is rotatably mounted on the inner support and driven to rotate by the adjustment handle, and the adjustment gear meshes with each movable rack to drive each movable rack to move; When the adjusting gear rotates, it drives each movable rack to move inward or outward synchronously.

3. The variable-size inner mold device for municipal prefabricated inspection wells according to claim 2, characterized in that: It includes four movable racks in pairs. The two movable racks in a pair are parallel to each other and located on both sides of the adjusting gear. The movable racks in different pairs are perpendicular to each other.

4. The variable-size inner mold device for municipal prefabricated inspection wells according to claim 2, characterized in that: The inner support has a rectangular guide hole corresponding to the movable rack. The non-toothed part of the movable rack slides in conjunction with the guide hole to constrain the linear movement direction of the movable rack.

5. The variable-size inner mold device for municipal precast inspection wells according to claim 4, characterized in that: The movable rack is provided with a number of positioning holes, and positioning pins are fitted into the positioning holes. After the positioning pins are inserted into the positioning holes, they are constrained by the inner bracket or guide holes to prevent the movable rack from retracting to the center.

6. The variable-size inner mold device for municipal prefabricated manholes according to claim 1, characterized in that: The arc-shaped frame is welded and fixed to the connecting node.

7. The variable-size inner mold device for municipal prefabricated inspection wells according to claim 3, characterized in that: The number of the arc-shaped frames is four.

8. The variable-size inner mold device for municipal prefabricated manholes according to claim 3, characterized in that: The adjustment handle is a T-shaped handle.

9. The variable-size inner mold device for municipal precast inspection wells according to claim 3, characterized in that: The inner support is a closed box with an outer shell.

10. The variable-size inner mold device for municipal prefabricated manholes according to claim 3, characterized in that: The support plate is a flexible metal plate or a plastic plate.

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