Die for prestressed hollow slab girder

Abstract

The utility model relates to a mould for a prestressed hollow slab beam, which comprises a bottom template, two side templates and two end templates, and further comprises a bump, the bump is arranged on the inner side of the end templates and is arranged close to one side of the bottom template, through holes are arranged on the bump and the end templates, and PVC (polyvinyl chloride) pipes or prestressed tendons can penetrate through the through holes. During pouring, the two side formworks and the two end formworks are installed around the bottom formwork, a space for pouring concrete is defined, then the concrete is poured into the space, finally, a notch to be plugged is formed in the end of the hollow slab beam, after pouring is completed, the side formworks and the end formworks are removed, redundant PVC pipes and prestressed tendons are cut off, and then the hollow slab beam is formed. And the to-be-plugged notch of the hollow slab beam is filled with the repairing material, so that the pipe orifice of the PVC pipe and the end part of the prestressed tendon can be effectively plugged and protected, rainwater entering the hollow slab beam can be reduced, and the prestressed tendon is prevented from being rusted.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hollow slab beam technical field, more particularly, relate to a mould for prestressed hollow slab beam. BACKGROUND

[0002] The pre-tensioning method refers to tensioning the prestressed tendon before pouring concrete, and temporarily anchoring it on the pedestal or steel mold, and then pouring concrete. When the concrete reaches a certain strength, the prestressed tendon is relaxed, and the prestressed tendon is applied to the concrete by elastic retraction. Hollow slab beam is its structural form, and the internal hollow part can reduce the self weight. This component is widely used in bridge construction and other engineering, which can effectively improve the crack resistance, stiffness of the component, and has better performance when bearing load, and can save materials.

[0003] The main manufacturing steps of the pre-tensioning method prestressed hollow slab beam at present are: cleaning the pedestal first, tensioning the prestressed tendon, building two side plates and two end plates on the pedestal to form a mold, pouring concrete, cutting off the prestressed tendon (steel strand) when the concrete strength reaches the design requirement, using the retraction force to make the concrete produce pre-stress, and the hollow slab beam is completed after demolding. In actual production process, in order to meet the needs of stress and construction, PVC pipe is sleeved on a part of the prestressed tendon (steel strand) near the end of the beam body, so that a part of the prestressed tendon (steel strand) does not contact with the concrete in a certain length range. After the concrete solidifies, the worker cuts off the prestressed tendon (steel strand) at the end of the beam. Since the pipe opening of the PVC pipe is exposed at the end of the beam, the worker can only apply a thin layer of sealing material at the end of the beam body, or directly seal without sealing. In long-term use, rainwater enters the hollow slab beam from the opening of the PVC pipe, causing the prestressed tendon (steel strand) to rust, and even causing the prestressed tendon (steel strand) to break, which seriously affects the safety and durability of the bridge structure, and even affects the overall safety and service life of the bridge, which needs to be improved. Utility model content

[0004] The utility model discloses a mould for prestressed hollow slab beam, which is used to make hollow slab beam. The end of the hollow slab beam is reserved for subsequent sealing of the opening of the PVC pipe and the gap of the prestressed tendon end, so that the prestressed tendon end of the beam end can be effectively sealed and protected for a long time, rainwater can be prevented from entering the hollow slab beam, and the rusting of the prestressed tendon can be effectively avoided.

[0005] To achieve the above technical purposes, the technical scheme of the utility model is as follows:

[0006] The utility model provides a mould for prestressed hollow slab beam, including bottom mould plate, two side mould plates and two end mould plates, still include the boss, the boss sets up in the inside of end mould plate, the boss is close to bottom mould plate one side setting, the height of boss is 9~10cm, the width of boss is 3~5cm, the bottom wall of boss and the bottom wall of end mould plate are coplanar, the boss and end mould plate all are equipped with through -hole, and the through -hole is used for the PVC pipe or the passage of prestressed reinforcement.

[0007] When pouring, the two side mould plates and the two end mould plates are installed around the bottom mould plate to form a space for pouring concrete, then the concrete is poured into the space, and finally a to-be-plugged gap is formed at the end of the hollow slab beam. After pouring is completed, the side mould plates and the end mould plates are removed, the excess PVC pipe and prestressed reinforcement are cut off, and a repairing material is filled in the to-be-plugged gap of the hollow slab beam. In this way, the pipe opening of the PVC pipe and the end of the prestressed reinforcement are effectively plugged, which is beneficial to reducing the entry of rainwater into the hollow slab beam and avoiding the corrosion of the prestressed reinforcement.

[0008] In a specific implementation, if there is one boss on each end mould plate, the width of the boss is equal to or less than the width of the end mould plate. If there are multiple bosses on each end mould plate, the bosses correspond to the prestressed reinforcements one by one.

[0009] If the number of bosses is one, the length of the boss can be equal to or less than the width of the end mould plate. If the number of bosses is multiple, the number of bosses needs to correspond to the prestressed reinforcements one by one. In actual construction, the number of bosses is generally one to simplify the process. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a structure diagram of the mould for prestressed hollow slab beam.

[0011] Legend: 1, bottom mould plate; 2, side mould plate; 3, end mould plate; 4, boss; 5, through hole. DETAILED DESCRIPTION

[0012] Reference Figure 1 A mould for prestressed hollow slab beam includes a bottom mould plate 1, two oppositely arranged side mould plates 2, and two oppositely arranged end mould plates 3. The bottom mould plate 1, the two side mould plates 2, and the two end mould plates 3 form a pouring space. The end mould plate 3 is provided with a boss 4. The boss 4 and the end mould plate 3 can be integrally formed, welded on the end mould plate 3, or connected by bolts, rivets, or other means. In this embodiment, the boss 4 is welded on the side wall of the end mould plate 3.

[0013] The protruding block 4 is located in the pouring space and is arranged close to one side of the bottom formwork 1. The height of the protruding block 4 is 9-10 cm. The bottom wall of the protruding block 4 is coplanar with the bottom wall of the end formwork 3. The width of the protruding block 4 is 3-5 cm. The protruding block 4 and the end formwork 3 are both provided with a through hole 5 for the PVC pipe or the prestressed tendon to pass through. If there is one protruding block 4 on each end formwork 3, the length of the protruding block 4 is equal to or less than the length of the end formwork 3. In the embodiment, the length of the protruding block 4 is equal to the length of the end formwork 3.

[0014] In other embodiments, if there are multiple protruding blocks 4 on each end formwork 3, the protruding blocks 4 correspond to the prestressed tendons one by one.

[0015] The above are preferred embodiments of the utility model, which do not limit the protection scope of the utility model. Therefore, equivalent changes made according to the structure, shape and principle of the utility model should be covered within the protection scope of the utility model.

Claims

1. A mold for prestressed hollow slab beams, comprising a bottom mold (1), two side molds (2) and two end molds (3), characterized in that: It also includes a protrusion (4), which is set on the inner side of the end template (3). The protrusion (4) is set on the side close to the bottom template (1). Both the protrusion (4) and the end template (3) are provided with through holes (5), which are used for PVC pipes or prestressing tendons to pass through.

2. The mold for a prestressed hollow slab beam according to claim 1, characterized in that: If there is one protrusion (4) on each end template (3), the length of the protrusion (4) is equal to or less than the length of the end template (3).

3. The mold for a prestressed hollow slab beam according to claim 1, characterized in that: If there are multiple protrusions (4) on each end template (3), the protrusions (4) correspond one-to-one with the prestressing tendons.

4. The mold for a prestressed hollow slab beam according to claim 1, characterized in that: The height of the protrusion (4) is 9-10 cm.

5. A mold for prestressed hollow slab beams according to claim 1, characterized in that: The width of the protrusion (4) is 3 to 5 cm.

6. The mold for a prestressed hollow slab beam according to claim 1, characterized in that: The bottom wall of the protrusion (4) is coplanar with the bottom wall of the end template (3).

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