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A method of integral tensioning and releasing of prestressed beams and slabs by broken line pretensioning method

An overall tensioning and prestressing technology, which is applied in the field of prestressed tensioning of prefabricated beams and slabs in bridge construction, can solve problems such as the inability to solve the problem of overall tensioning and releasing of broken line bundles, failure to improve the efficiency of prestressed construction, and difficulty in synchronizing tensioning, etc. problem, to achieve the effect of saving process time, simple structure and simple construction

Active Publication Date: 2021-09-17
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that at present, the prestressed overall tensioning process in engineering is mostly used for the overall tensioning of hollow beams. , and then prestressing a single stretched and folded wire bundle, so that the prestressing construction effect cannot be improved, and this process has certain safety hazards, and it cannot solve the overall tension and release of the folded wire bundle; the other is to optimize on this basis In other words, the folded line and the straight line bundle are taken as a whole, and the specially designed components are used to stretch the corresponding jacks respectively; however, since the jacks are separated, the operator must control the stretching of the straight line and the folded line bundle at the same time, and Due to the different lengths of the prestressed bundles, it is difficult to maintain the synchronization of tensioning, and because the components are complex, when the prestressed tension is released, due to the unbalanced force of the steel bundles, it will cause serious safety hazards, and a Breakline Pre-tensioning Method of Prestressed Overall Tensioning and Release of Beams and Slabs

Method used

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  • A method of integral tensioning and releasing of prestressed beams and slabs by broken line pretensioning method
  • A method of integral tensioning and releasing of prestressed beams and slabs by broken line pretensioning method
  • A method of integral tensioning and releasing of prestressed beams and slabs by broken line pretensioning method

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Embodiment 1

[0029] see Figure 1-5 Shown, a kind of broken line pre-tensioning method beam slab prestressed overall stretching release method comprises the following steps;

[0030] The first step: place the anchor trolley 3 on the limit slide rail of the pedestal concrete foundation 6, keep a fixed distance from the reaction wall 2, and then pass the four tie rods 5 through the first tie rod holes of the reaction wall 2 and anchor The second rod hole of the trolley 3, and install the first gasket at one end of the beam body 11, lock the first nut 14, so that the gasket is close to the anchor trolley 3; at the end far away from the beam body 11, place the first The second gasket is closely attached to the reaction wall 2, and the pull rod 5 is locked through the second nut 15, then the through-hole jack 1 with the foot support is passed through the pull rod 5, and then the piston end is locked with the second nut 15;

[0031] Step 2: Pass the stress beam 9 through the core jack 1 and pre-t...

Embodiment 2

[0039] Such as figure 2 As shown, compared with Embodiment 1, the difference is that: the two sides of the top surface of the pedestal concrete foundation 6 are provided with reaction force columns 12, and steel drawstrings 13 are arranged between two groups of reaction force columns 12, and the steel drawstrings 13 are X shaped structure, the reaction force column 12 is provided with a first tie rod hole, and the anchor trolley 3 is provided with a second tie rod hole, the first tie rod hole corresponds to the second tie rod hole one by one, and the first tie rod hole and the second tie rod hole are respectively Four groups are arranged at equal intervals, and the pull rods 5 pass through the first pull rod hole of the reaction force column 12 and the second pull rod hole of the anchor trolley 3 in turn, and the end of the pull rod 5 close to the anchor trolley 3 is threaded with a first nut 14, the first A first gasket is arranged between the nut 14 and the anchor trolley 3...

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Abstract

The invention discloses a method for integral tensioning and releasing of prestressed beams and slabs by the broken line pretensioning method, which comprises the following steps: placing the anchor trolley on the limit slide rail of the concrete foundation of the pedestal, keeping a fixed distance from the reaction wall, and then placing the four The tie rods respectively pass through the first tie rod hole of the reaction wall and the second tie rod hole of the anchor trolley; the stress beam is passed through the center jack and pre-tightened according to the preset pre-tightening force, and then anchored in the reaction force through the single-hole anchor. On the wall, the steering of the broken line bundle is completed by the bogie in the horizontal direction; after the stress bundle is pre-tightened, it begins to enter the overall tension stage, and through two intelligent pumping stations, eight through-hole jacks are controlled for complete displacement synchronization. Integral stretching: the present invention provides a new integral tensioning and releasing method for the prestressed prestressed beams and slabs by the broken line pretensioning method, which makes the construction of the broken line pretensioned beams and slabs simpler and more efficient.

Description

technical field [0001] The invention belongs to the technical field of prestressed tensioning of prefabricated beams and slabs in bridge construction, and specifically relates to a prestressed overall tensioning and releasing method of beams and slabs by a broken line pretensioning method. Background technique [0002] In the prestressed structure, the overall tensioning process of the pretensioned structure is simple, the construction speed is fast, the durability is good, and there is no stress concentration under the anchor, etc., which has incomparable advantages over the post-tensioning method; but in order to improve the spanning capacity of the beam and slab, first Part of the prestressed steel tendons of the tension beam slab will be arranged in the form of broken lines at both ends, forming a new type of structure of "prestressed concrete pre-tensioned beam with broken line reinforcement", and the new overall tensioning method enables the rapid implementation of this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B23/04
CPCB28B23/043
Inventor 刘志峰唐博学周志鸿吴伟豪刘新来郭子学李仕军许佳师钟咏
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG