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0 type block anti-cracking construction method of high pier large across creeping formwork

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: 2009-04-22
CHINA GEZHOUBA GROUP CO LTD +1
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  • Claims
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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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  • 0 type block anti-cracking construction method of high pier large across creeping formwork
  • 0 type block anti-cracking construction method of high pier large across creeping formwork
  • 0 type block anti-cracking construction method of high pier large across creeping formwork

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Embodiment Construction

[0020] Such as 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] Pour the first warehouse 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*3.0 thin-walled pipe, the distance between the transverse bridges is 50cm, and a layer is arranged in the middle of the bottom ...

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Abstract

The invention discloses a No. 0 block anti-cracking construction method for high-pier long-span continuous rigid frame bridges. Concrete is poured twice on a pier top platform, wherein the concrete is poured to a height between 0.3 and 0.6 time that of a web plate in a first step; the rest concrete is poured in a second step; and the age of two layers of concrete is controlled within 15 days. The construction method comprises the following steps of: a. preparing for construction; b. installing a cooling water pipe and a temperature sensor; c. setting up a heat preservation shed; d. pouring the concrete, providing the poured concrete with water for temperature reduction through the cooling water pipe, controlling the temperature of the heat preservation shed to preserve heat and pouring low-heat cement; and e. stretching a temporary prestressing tendon. When a second bin of concrete is poured, the temporary prestressing tendon is arranged. The construction method adopting the combined use of temperature control and the temporary prestressing tendon can effectively control temperature stress in the concrete, and can prevent harmful cracks from being produced.

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 Applications(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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