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Anti-crack Construction Method for No.0 Block of Long-span Continuous Rigid Frame Bridge with High Pier

A construction method and rigid-frame bridge technology, applied in bridges, bridge construction, erection/assembly of bridges, etc., can solve problems such as easy cracks, hidden dangers, and great safety, and achieve the effect of preventing harmful cracks

Inactive Publication Date: 2011-12-28
CHINA GEZHOUBA GROUP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the rapid development of my country's transportation industry, high-pier long-span continuous rigid-frame bridges have been popularized and applied in the field of bridge engineering. Block 0 of high-pier long-span continuous rigid-frame bridges belongs to the category of mass concrete and three-way prestressed concrete. In actual construction, due to the influence of temperature stress, cracks are easily generated. If the cracks spread and affect the work of the prestressed beams, there will be a great safety hazard during the operation of the bridge. Preventing the occurrence of harmful cracks in Block 0 is an important technology problem

Method used

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  • Anti-crack Construction Method for No.0 Block of Long-span Continuous Rigid Frame Bridge with High Pier
  • Anti-crack Construction Method for No.0 Block of Long-span Continuous Rigid Frame Bridge with High Pier
  • Anti-crack Construction Method for No.0 Block of Long-span Continuous Rigid Frame Bridge with High Pier

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Embodiment Construction

[0020] like figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 The anti-cracking construction method of No. 0 block of a high-pier long-span continuous rigid-frame bridge shown in the Image 6 Concrete is poured twice on the construction platform, the first pouring is to the compartment line 5 (0.3 to 0.6 times the web height), and the remaining part is pouring the second time. The age of the concrete on the second floor is controlled within 15 days, including the following step:

[0021] The first pour of concrete. a. Construction preparation, installation of bottom formwork, installation and fixation of outer formwork, installation and fixation of vertical prestressed tendons of web and diaphragm. b. Install cooling water pipes and temperature sensors. Cooling water pipe installation: Cooling water pipe 4 adopts Φ50*3.0mm thin-walled pipe, the distance between the horizontal bridges is 50cm, and a layer is arranged in the middle of the bottom plate. P...

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Abstract

The invention discloses an anti-cracking construction method for No. 0 block of a high-pier long-span continuous rigid frame bridge. Concrete is poured twice on the pier top platform. For the remaining part, the age of the two-layer concrete is controlled within 15 days, including the following steps: a. Construction preparation, b. Install cooling water pipes and temperature sensors, c. Set up insulation sheds, d. Pour concrete, and pour concrete through the cooling water pipes Water cooling, temperature control of heat preservation shed, use of low-heat cement pouring, e, tensioning temporary prestressed beams, when pouring the second warehouse concrete, temporary prestressed beams are set, the present invention adopts the joint use of temperature control and temporary prestressed beams The construction method can effectively control the temperature stress in the concrete and prevent harmful cracks.

Description

[technical field] [0001] The invention relates to a large-volume concrete and three-way prestressed concrete construction method, in particular to a crack-proof construction method for No. 0 block of a high-pier long-span continuous rigid frame bridge. [Background technique] [0002] With the rapid development of my country's transportation industry, high-pier long-span continuous rigid-frame bridges have been popularized and applied in the field of bridge engineering. Block 0 of high-pier long-span continuous rigid-frame bridges belongs to the category of mass concrete and three-way prestressed concrete. In actual construction, due to the influence of temperature stress, cracks are easily generated. If the cracks spread and affect the work of the prestressed beams, there will be a great safety hazard during the operation of the bridge. Preventing the occurrence of harmful cracks in Block 0 is an important technology problem. The mechanism of cracks: cracks are mainly caused ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00
Inventor 付俊雄刘雄吕芝林严泽洪周山张海艳邓迪文
Owner CHINA GEZHOUBA GROUP CO LTD
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