Segmented foldable shrinkage core for box girder

Abstract

A box girder segmented foldable shrink core mold, which comprises segmented core molds, stacked rod longitudinal connecting steel wires and core mold longitudinal connecting bolts; the adjacent edges of the segmented core molds are connected by the core mold longitudinal connecting bolts to form a whole; a stacked rod longitudinal connecting steel wire is connected between the adjacent segmented core molds. The box girder segmented foldable shrink core mold has the following beneficial effects: the box girder folding inner mold can be stably folded and unfolded, and can be stably separated from the concrete, and the operation is convenient, so that the dismounting efficiency and construction safety of the box girder core mold can be improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of bridge prefabrication devices, specifically relating to a segmented foldable and retractable core mold for box girders. Background Technology

[0002] Currently, highway bridge projects account for a large proportion of highway construction in my country. Box girders are the most important component of highway bridges, and they typically need to be prefabricated in specialized beam fabrication yards. Because box girders are hollow, core molds are required to create cavities in the cast-in-place box girder. Current box girder core molds are generally composed of multiple templates assembled sequentially. During formwork erection, numerous screw-driving processes are required; during demolding, each screw must be unscrewed individually. The assembly and disassembly process is cumbersome, consuming significant time and manpower, resulting in low construction efficiency and difficulty in ensuring safety. Utility Model Content

[0003] In order to solve the above problems, the purpose of this utility model is to provide a segmented foldable and retractable core mold for box girders.

[0004] To achieve the above objectives, the box girder segmented foldable and retractable core mold provided by this utility model includes: segmented core molds, stacked rod longitudinal connecting rod steel wire ropes, and core mold longitudinal connecting bolts; wherein, the adjacent edges of multiple segmented core molds are connected to form an integral whole by multiple core mold longitudinal connecting bolts; a stacked rod longitudinal connecting rod steel wire rope is connected between adjacent segmented core molds, thereby forming a linkage structure between the segmented core molds.

[0005] The segmented core mold includes a core mold body, a folding structure, a connecting structure, and a supporting structure. The core mold body includes symmetrically arranged left and right templates. The folding structure includes an upper core mold flap, a lower core mold flap, and a core mold shrink flap. The connecting structure consists of tongue-and-groove bolts. The supporting structure includes an upper folding rod, a lower folding rod, a longitudinal connecting rod of the stacked rods, a central shaft fixing screw for the stacked rods, and a stacked rod fixing screw. The left and right templates are interlocked by upper and lower tongue-and-groove joints at their upper and lower ends, respectively, and connected together using tongue-and-groove bolts, thus forming a symmetrical polygonal cylinder with internal support space. The upper and lower parts of the left and right templates are connected by multiple core mold shrink flaps spaced apart along their length, allowing the upper and lower parts to fold inwards or unfold for the core mold. The main body is assembled or disassembled; multiple upper and lower core mold flaps are provided at intervals along the length on the top and lower inner sides of the left and right templates; the upper end of each upper folding rod and the lower end of each lower folding rod are respectively hinged to an upper core mold flap and a lower core mold flap; the lower ends of corresponding upper folding rods and the upper ends of lower folding rods are connected by stacking rod fixing screws; the stacking rod longitudinal connecting rods are set horizontally and are simultaneously connected to the lower ends of multiple upper folding rods and the upper ends of lower folding rods through the stacking rod central axis fixing screws; the stacking rod longitudinal connecting rods can move the left and right templates closer to or further away from each other to facilitate folding or unfolding the core mold body; the two ends of the stacking rod longitudinal connecting rod wire rope are respectively connected between the adjacent ends of two stacking rod longitudinal connecting rods on two adjacent segmented core molds.

[0006] The corresponding upper and lower tongues on the left and right templates are inclined surfaces that can be stacked together. This structure facilitates sealing of the core mold body and reduces grout leakage.

[0007] The segmented, foldable, and retractable core mold for box girders provided by this utility model has the following beneficial effects:

[0008] The folding inner mold of the box girder can be stably folded and unfolded, and can also be stably separated from the concrete. It is easy to operate, thus improving the efficiency of box girder core mold removal and construction safety. Attached Figure Description

[0009] Figure 1 A schematic diagram of the cross-sectional structure of the segmented core mold in the segmented foldable and retractable core mold for box girders provided by this utility model;

[0010] Figure 2 A schematic diagram of the cross-sectional structure of the left template in the segmented foldable and retractable core mold for box girders provided by this utility model;

[0011] Figure 3 A schematic diagram of the cross-sectional structure of the right template in the segmented foldable and retractable core mold for box girders provided by this utility model;

[0012] Figure 4A top view of the segmented foldable and retractable core mold structure of the box girder provided by this utility model. Detailed Implementation

[0013] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0014] like Figures 1 to 4 As shown, the segmented foldable and retractable core mold of the box girder provided by this utility model includes: segmented core mold, stacked rod longitudinal connecting rod steel wire rope 11 and core mold longitudinal connecting bolt 12; wherein, the adjacent edges of multiple segmented core molds are connected to form an integral whole by multiple core mold longitudinal connecting bolts 12; a stacked rod longitudinal connecting rod steel wire rope 11 is connected between adjacent segmented core molds, thereby forming a linkage structure between the segmented core molds.

[0015] The segmented core mold includes a core mold body 1, a folding structure, a connecting structure, and a supporting structure. The core mold body 1 includes a symmetrically arranged left and right template. The folding structure includes an upper core mold hinge 5, a lower core mold hinge 6, and a core mold shrink hinge 7. The connecting structure is a tongue-and-groove bolt 4. The supporting structure includes an upper folding rod 8, a lower folding rod 9, a longitudinal connecting rod 10, a central shaft fixing screw 13, and a fixing screw 14. The left and right templates are interlocked by upper tongue-and-groove bolts 2 and lower tongue-and-groove bolts 3 at their upper and lower ends, respectively, and connected by the tongue-and-groove bolts 4, thus forming a symmetrical polygonal cylinder with internal supporting space. The upper and lower parts of the left and right templates are connected by multiple core mold shrink hinges 7 spaced apart along their length, allowing the upper and lower parts to fold inwards or unfold, facilitating the core mold body 1. Assembly or disassembly is performed; multiple upper folding flaps 5 and lower folding flaps 6 of the core mold are provided at intervals along the length direction on the top and lower inner sides of the left and right templates respectively; the upper end of each upper folding rod 8 and the lower end of each lower folding rod 9 are respectively hinged to an upper folding flap 5 and a lower folding flap 6 of the core mold; the lower ends of the corresponding upper folding rods 8 and the upper ends of the lower folding rods 9 are connected by stacking rod fixing screws 14; the stacking rod longitudinal connecting rods 10 are set horizontally and are simultaneously connected to the lower ends of multiple upper folding rods 8 and the upper ends of lower folding rods 9 by stacking rod central shaft fixing screws 13; the stacking rod longitudinal connecting rods 10 can move the left and right templates closer to or further away from each other to facilitate folding or unfolding the core mold body 1; the two ends of the stacking rod longitudinal connecting rod wire rope 11 are respectively connected between the adjacent ends of the two stacking rod longitudinal connecting rods 10 on two adjacent segmented core molds.

[0016] The corresponding upper tongue-and-groove 2 and lower tongue-and-groove 3 on the left and right templates are inclined surfaces that can be stacked together. This structure facilitates sealing of the core mold body 1 and reduces grout leakage.

[0017] The installation and removal method of the segmented foldable shrinkable core mold for box girders provided by this utility model will now be described.

[0018] The installation method is as follows:

[0019] 1. During installation, use a gantry crane to lift the left and right templates on the core mold body 1 upwards respectively. Then, align the corresponding upper folding rod 8 and lower folding rod 9 into a straight line. After that, pass the folding rod fixing screws 14 through the fixing holes at the lower end of the upper folding rod 8 and the upper end of the lower folding rod 9 and tighten them. This will unfold the left and right templates.

[0020] 2. Fasten the upper tongue and groove 2 and lower tongue and groove 3 on the left and right templates together, and then connect the left and right templates together using tongue and groove connecting bolts 4, thereby forming a symmetrical polygonal cylinder with internal support space; then connect the stacked rod longitudinal connecting rod 10 to the lower end of multiple upper folding rods 8 and the upper end of lower folding rods 9 simultaneously through the stacked rod central axis fixing screw 13, so that the upper folding rods 8 and lower folding rods 9 will not shift, thereby assembling a segmented core mold;

[0021] 3. Connect the adjacent edges of the multi-segment core molds with multiple longitudinal connecting bolts 12 to form a whole; then connect the two ends of a stacked rod longitudinal connecting rod steel wire rope 11 to the adjacent ends of the two stacked rod longitudinal connecting rods 10 on two adjacent segment core molds, thereby forming a linkage structure between the segment core molds to obtain the assembled box girder segmented foldable shrinkable core mold; finally, apply a release agent to the box girder segmented foldable shrinkable core mold and hoist it into the cage.

[0022] The demolition method is as follows:

[0023] 1. Remove all longitudinal connecting screws 12, tongue and groove connecting bolts 4 and stacking rod fixing screws 14 in sequence to put the core mold body 1 in a free state without constraints;

[0024] 2. Install the wire rope on the winch onto the longitudinal connecting rod 10 of the stacked rod at the end of the core mold body 1, and first remove the left template of the core mold body 1;

[0025] 3. Start the winch and pull the longitudinal connecting rod 10 of the stacking rod. At this time, the upper stacking rod 8 and the lower stacking rod 9 on the left template will pull the upper and lower parts of the left template through the upper fold 5 and the lower fold 6 of the core mold, so that the upper and lower parts of the left template rotate inward around the core mold shrinking fold 7, thereby folding and shrinking inward.

[0026] 4. Pull out the first section of the core mold body 1. The stacked rod longitudinal connecting rod steel wire rope 11 will drag the next section of the core mold body 1 to retract in sequence, thereby pulling out and removing the core mold body 1 in sequence.

[0027] 5. After pulling out one side of the core mold body 1, retract the other side of the core mold body 1 in sections according to the above operation.

Claims

1. A segmented, foldable, and retractable core mold for box girders, characterized in that: The segmented foldable and retractable core mold of the box girder includes: segmented core mold, stacked rod longitudinal connecting rod steel wire rope (11) and core mold longitudinal connecting bolt (12); wherein, the adjacent edges of multiple segmented core molds are connected to form an integral whole by multiple core mold longitudinal connecting bolts (12); a stacked rod longitudinal connecting rod steel wire rope (11) is connected between adjacent segmented core molds, thereby forming a linkage structure between the segmented core molds.

2. The segmented foldable and retractable core mold for box girders according to claim 1, characterized in that: The segmented core mold includes a core mold body (1), a folding structure, a connecting structure, and a supporting structure; wherein, the core mold body (1) includes a symmetrically arranged left template and a right template; the folding structure includes a core mold upper fold (5), a core mold lower fold (6), and a core mold shrink fold (7); the connecting structure is a tongue and groove connecting bolt (4); the supporting structure includes an upper folding rod (8), a lower folding rod (9), a stacked rod longitudinal connecting rod (10), a stacked rod central axis fixing screw (13), and a stacked rod fixing screw (14); the left template and the right template are respectively interlocked by an upper tongue and groove (2) and a lower tongue and groove (3) located at the upper and lower ends, and connected together by tongue and groove connecting bolts (4), thereby forming a symmetrical polygonal cylinder with internal supporting space; the upper and lower parts of the left template and the right template are respectively connected by multiple spaced sections along the length direction. The core mold shrink flaps (7) are connected; multiple core mold upper flaps (5) and core mold lower flaps (6) are provided at intervals along the length direction on the uppermost and lower inner sides of the left and right templates; the upper end of each upper folding rod (8) and the lower end of each lower folding rod (9) are respectively hinged to a core mold upper flap (5) and a core mold lower flap (6); the lower end of the corresponding upper folding rod (8) and the upper end of the lower folding rod (9) are connected by stacking rod fixing screws (14); the stacking rod longitudinal connecting rod (10) is set horizontally and is simultaneously connected to the lower end of multiple upper folding rods (8) and the upper end of lower folding rods (9) by stacking rod central axis fixing screws (13); the two ends of the stacking rod longitudinal connecting rod wire rope (11) are respectively connected between the adjacent ends of the two stacking rod longitudinal connecting rods (10) on two adjacent segmented core molds.

3. The segmented foldable and retractable core mold for box girders according to claim 1, characterized in that: The corresponding upper tongue (2) and lower tongue (3) on the left and right templates are inclined surfaces that can be stacked together.

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