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Vertical crack grouting and reinforcing method of prestressed concrete hollow slab bridge bottom plate

A hollow slab bridge, longitudinal crack technology, used in bridge reinforcement, bridges, bridge materials, etc.

Active Publication Date: 2012-03-28
刘其伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In order to overcome the existing problems and deficiencies in existing crack maintenance and reinforcement methods, the present invention provides a grouting reinforcement method for longitudinal cracks in the bottom plate of prestressed concrete hollow slab bridges and its construction technology. Pour a certain thickness of cement-based grouting material, and actively seal the wide, deep and long longitudinal cracks of the bottom plate from the source through the effective bonding of the grouting material and the bottom plate concrete to prevent water leakage inside the plate girder and water vapor in the air , Harmful media, etc. enter the cracks to cause corrosion and fracture of the prestressed steel strands, thereby improving the durability and safety of the bridge structure

Method used

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  • Vertical crack grouting and reinforcing method of prestressed concrete hollow slab bridge bottom plate
  • Vertical crack grouting and reinforcing method of prestressed concrete hollow slab bridge bottom plate
  • Vertical crack grouting and reinforcing method of prestressed concrete hollow slab bridge bottom plate

Examples

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Embodiment 1

[0176] The bottom slab grouting construction is carried out on the 3×13m prestressed concrete simply supported hollow slab bridge, the longitudinal slope of the bridge is i=0%, and the section of the hollow slab is figure 1 The second type of plate girder section. The specific grouting reinforcement methods and construction techniques are as follows:

[0177] 1. Carry out inspection and research on the longitudinal cracks in the bottom plate of the bridge. According to the distribution of longitudinal cracks in the bottom plate and the severity of the disease, it is determined that the number of prestressed hollow slabs to be reinforced is 4 pieces;

[0178] 2. For each prestressed hollow slab to be reinforced, drill holes at the thinnest part of the slab girder floor at a distance of 50cm from the end of the slab girder and at the mid-span position of the slab girder. The diameter of the hole is 3.0cm. The total number is 12, and the drilling position of each prestressed hol...

Embodiment 2

[0190] The bottom slab grouting construction is carried out on the 1×16m prestressed concrete simply supported hollow slab bridge, the longitudinal slope of the bridge is i=1.5%, and the cross section of the hollow slab is figure 1 The third type of slab beam section. The specific grouting reinforcement methods and construction techniques are as follows:

[0191] 1. Carry out inspections and investigations on the longitudinal cracks in the bottom plate of the bridge. According to the distribution of longitudinal cracks in the bottom plate and the severity of the disease, it is determined that the number of prestressed concrete hollow slabs to be reinforced is three;

[0192] 2. According to the longitudinal slope i=1.5% of the prestressed concrete hollow slab bridge to be reinforced and the limit value of the grouting height difference between the low and high points of the floor [Δh]=5cm~10cm, determine the segmental grouting length L according to formula (1-2) k = 500cm. T...

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Abstract

The invention provides a vertical crack grouting and reinforcing method of a prestressed concrete hollow slab bridge bottom plate. According to the method, pressure grouting equipment is mainly adopted to pour a cement-based grouting material into a prestressed concrete hollow plate cavity with a certain thickness, wide, deep and long vertical cracks on the bottom plate can be actively sealed fundamentally through effective adhesion of the grouting material and bottom plate concrete, thereby preventing leakage water inside plates and steams, as well as steam and harmful media and the like in air from entering the cracks to result in rust corrosion and breakage of prestressed steel stranded wires, and further improving the durability and safety of a bridge structure.

Description

technical field [0001] The invention relates to the technical field of maintenance and reinforcement construction of medium and small-span bridges, in particular to a maintenance and reinforcement method for longitudinal cracks in the bottom plate of prestressed concrete hollow slab bridges. Background technique [0002] At present, the construction level of long-span bridges in my country has entered the international advanced ranks, but medium and small-span bridges still occupy a very important position. Among them, the prestressed concrete hollow slab bridge is widely used because of its many advantages, and it is one of the main bridge types in the construction of expressways, urban roads and road networks in my country. [0003] Prestressed concrete hollow slab bridges can be roughly divided into four types according to their cross-sectional forms. The cross-sectional forms usually correspond to the spans of hollow slab bridges one by one: the first and second types of...

Claims

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Application Information

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IPC IPC(8): E01D22/00E01D101/28
Inventor 刘其伟赵佳军李捷王成明罗文林翟瑞兴许崇法王键
Owner 刘其伟
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