Drawing type steel inner die and construction method of prefabricated hollow slab girder

A hollow slab beam and pull-type technology, which is applied in the direction of manufacturing tools, ceramic molding mandrels, ceramic molding machines, etc., can solve the problem of ensuring that the pulling force coincides with the axis of the pull rod, reducing the utilization rate of the steel inner mold and production efficiency, steel Problems such as internal mold sticking have been solved, and the drawing operation is stable and controllable, the construction efficiency is high, and the effect of easy demoulding is achieved

Pending Publication Date: 2017-12-15
中铁二十二局集团第三工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual operation, it is difficult to ensure that the pulling force coincides with the axis of the pull rod. Once the pulling force deviates from the axis of the pull rod, the arm plate will be deformed, the hinge will be damaged, ...

Method used

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  • Drawing type steel inner die and construction method of prefabricated hollow slab girder
  • Drawing type steel inner die and construction method of prefabricated hollow slab girder
  • Drawing type steel inner die and construction method of prefabricated hollow slab girder

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Experimental program
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Embodiment 1

[0058] This embodiment is the embodiment of the pull-out steel inner mold. See Figure 1 to Figure 2 , the length of each section of the pull-type steel inner mold in this embodiment is 5m, and each section of the steel inner mold includes a first formwork 10 and a second formwork 20. The first template 10 includes a first member 11 and a second member 12 that are vertically symmetrical, and the second template 20 includes a third member 21 and a fourth member 22 that are vertically symmetrical. The cross sections of the first member 11, the second member 12, the third member 21 and the fourth member 22 are all approximately L-shaped steel plates, and the four members together form a hollow cylindrical structure to form the outer frame of the pull-out steel inner mold body.

[0059] In this embodiment, each component is provided with a supporting steel plate 51 and a component beam 52 . Among them, the supporting steel plate 51 adopts a steel plate with a thickness of 1 cm,...

Embodiment 2

[0063] This embodiment is a construction method for realizing prefabricated hollow slab girders using the pull-out steel inner formwork of Embodiment 1. The process flow chart of the construction method of this embodiment can be found in image 3 , including the following steps:

[0064] Step 1: Construction preparation. Construction preparation mainly includes site selection, prefabricated pedestal, steel formwork processing; reinforcement and concrete material acceptance and storage; mixing and transportation equipment and other tools; Example 1 of the pull-type steel inner mold.

[0065] Step 2: Binding of bottom and web steel bars and installation of bellows and anchors. This step includes the following sub-steps. The order of the sub-steps is not specified, and they are strictly carried out in accordance with the design drawings and construction technical specifications:

[0066] Step 2.1: Bottom and web reinforcement binding. On the prefabricated pedestal, the bottom...

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Abstract

The invention discloses a drawing type steel inner die. The drawing type steel inner die comprises a first die plate and a second die plate. The first die plate comprises a first component and a second component which are symmetrically arranged in the vertical direction and are hinged to each other. The second die plate comprises a third component and a fourth component which are symmetrically arranged in the vertical direction and are hinged to each other. The four components jointly form a hollow cylindrical structure. The first die plate and the second die plate are each provided with a drawing unit. Each drawing unit comprises a main shaft pull rod and at least one steel wire rope, wherein the middle portion of each steel wire rope is fixedly connected with the main shaft pull rod, and the two ends of the steel wire rope are fixedly connected with the upper component and the lower component. The invention further discloses a construction method used for a prefabricated hollow slab girder and achieved through the drawing type steel inner die. According to the technical scheme, the drawing units which are composed of the steel wire ropes and the main shaft pull rods are adopted to carry out drawing die dismounting, connection can be achieved without hinges, the risks that the hinges and the components are damaged in the drawing process of the steel inner die are eradicated, the clamping problem is solved, the maintaining cost is low, repeated using is facilitated, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of highway bridge construction, in particular to a construction method of a pull-out steel inner formwork and a prefabricated hollow slab girder. Background technique [0002] Hollow slab beam prefabrication technology is widely used in the current highway construction. After years of development, the hollow slab beam prefabrication method has experienced wooden mandrels, steel-wood composite mandrels, and air capsule mandrels, and gradually developed into the existing hinged pull-type steel inner molds. For example, the Chinese invention patent document CN102294741A discloses A hinged pull-type steel inner formwork solves the defects of insufficient rigidity and high buoyancy of the traditional mandrel, which makes it difficult to locate, greatly shortens the installation and removal time, and significantly improves the prefabrication quality of hollow slab girders. However, in the above-mentioned inventio...

Claims

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Application Information

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IPC IPC(8): B28B7/30B28B23/04B28B13/06
CPCB28B7/30B28B13/06B28B13/065B28B23/04B28B23/046
Inventor 虞乐洪邹德松吴建华刘四德王宏马起柱王军涛
Owner 中铁二十二局集团第三工程有限公司
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