Construction method for integrally and downward putting cofferdam ring beams by means of continuous jack method

A construction method and jacking technology, applied in infrastructure engineering, construction, etc., can solve problems such as high construction safety risks, large labor force, and difficulty in synchronous control, so as to reduce the amount of high-altitude operations, avoid labor force, and reduce the assembly of ring beams the effect of time

Active Publication Date: 2013-08-14
1ST ENG OF CHINA ZHONGTIE MAJORBRIDGE GROUP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing construction schemes still have deficiencies. The use of continuous screw jacks to lower the ring beam takes a long time, requires a large number of labor forces, has a large construction safety risk, and is difficult to control synchronously during lowering. It is difficult to solve the overall problem of the underwater ring beam. Decentralized Technical Issues

Method used

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  • Construction method for integrally and downward putting cofferdam ring beams by means of continuous jack method
  • Construction method for integrally and downward putting cofferdam ring beams by means of continuous jack method
  • Construction method for integrally and downward putting cofferdam ring beams by means of continuous jack method

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Embodiment Construction

[0031] figure 1 Number 1 shows the axis of the bridge. Figure 7 The middle mark B shows the position where the steel strands of the upper ring beam are inserted; Figure 9 Center C shows the position where the steel strands of the ring girder of the lower layer are inserted.

[0032] Such as figure 2 As shown, a steel pipe connection system 35 is provided between the middle ring beam 10 and the upper ring beam 9 .

[0033] Such as Figure 1 to Figure 9 As shown, the continuous jack method cofferdam ring beam integral lowering construction method of the present invention is carried out according to the following steps successively:

[0034] The first step is to install the ring beam suspension system. This step includes the following sub-steps:

[0035] ① Install the ring beam and lower the Bailey beam 2, such as Figure 1 to Figure 3 As shown, there are more than 6 groups of Bailey beams 2 on the top floor, preferably 6 groups, and the laying of the Bailey beams 2 on t...

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Abstract

The invention discloses a construction method for integrally and downward putting cofferdam ring beams by means of a continuous jack method. The construction method sequentially comprises: step one, installing a ring beam hanging system; step two, integrally uplifting ring beams and dismounting ring beam butt-joint platform bailey beams; step three, firstly putting the ring beams downward; step four, converting a ring beam system; and step five, secondarily putting lower-layer ring beams downward. A jack is continuously used for providing force for putting the ring beams downward, so that the demand for labor force is reduced, and temporarily organized large-scale labor force is avoided. In addition, corresponding cost is reduced, the ring beam splicing time on a cofferdam is shortened, and time is saved for tubular pile inserting and driving and sludge suction of the cofferdam. The integral downward putting of the ring beams can reach 2m each hour, and time is saved for the overall downward putting process. The high-altitude operation amount is decreased during construction. Original upper-layer ring beams are used as a downward putting platform, and integral underwater downward putting of the lower-layer ring beams is achieved.

Description

technical field [0001] The invention relates to a method for integrally lowering a large cofferdam after integral assembly, in particular to a construction method for integrally lowering a cofferdam ring beam underwater. Background technique [0002] The structure of the cofferdam ring beam is: three layers of ring beams (from top to bottom including upper layer ring beams, middle layer ring beams and lower layer ring beams) and inner supports are set in the cofferdam. [0003] The ring beam of the lower layer is made of 2H700*300 type steel, the internal support is made of Φ820*14mm steel pipe, and the oblique support is made of Φ630*8mm steel pipe, with a total weight of about 191t. The first lowering center elevation is +12.0m, and the final lowering is to the center elevation +6.5m. [0004] The middle layer ring beam is made of 2H900*300 steel, the internal support is Φ820*14mm, and the oblique support is Φ630*8mm steel pipe, with a total weight of about 222t, which nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/04
Inventor 宋洪喜张耀李智勇李响郑康申世静刘冬孟庆科李铁
Owner 1ST ENG OF CHINA ZHONGTIE MAJORBRIDGE GROUP
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