Box jacking method for performing correction on deflection end by virtue of jack in oblique crossing jacking process
A jacking and box technology, applied in the erection/assembly of bridges, bridges, buildings, etc., can solve the problems of uneven soil eating on both sides of the box, damage to the finished box, and deflection of the center line of the box. The effect of deviation correction is obvious, the construction speed is improved, and the operation is convenient.
Active Publication Date: 2015-06-03
CHINA RAILWAY SIXTH GRP TIANJIN RAILWAY CONSTR +1
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, affected by factors such as land acquisition and demolition, existing roads, etc., the angle between the center line of box jacking design and the existing railway is getting smaller and smaller, which increases the difficulty of jacking construction. When the cabinet is prone to center line deflection
In order to prevent this problem, the main correction methods currently used are: unevenly arrange top picks on both sides of the bottom plate at the rear end of the box; Excavate more soil at the edge of the side; 3. Uneven excavation of the soil at the front end of the bottom plate
[0003] However, in the actual construction process, there is often a large deviation between the actual jacking force and the theoretically calculated jacking force, which will directly affect the layout of the jack during jacking; and the underground soil quality during the jacking process may be inconsistent with the geological survey report , so the guiding significance of jack arrangement according to the theoretical calculation of the jacking force will be reduced; in addition, during the jacking process, more jacks are installed on one side of the bottom plate at the rear end of the box body, and the method of offsetting the deflection moment by increasing the jacking force on the side is easier for the finished box The vertical cracks in the vertical wall of the box body will be increased; in addition, the effect of excavating soil using the blade angle and uneven bottom plate is not intuitive enough in the construction process, and the specific degree of excavation operation is not conducive to grasping
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] The box jacking method provided by the present invention, which uses jack picks to correct deviation at the deflection end during the oblique jacking process, will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0019] Such as figure 1 — Figure 7 As shown, in the oblique jacking process provided by the present invention, the box jacking method using a jack pick to correct the deflection end includes the following steps in order:
[0020] 1) The existing railway at the jacking place shall be reinforced according to commonly used reinforcement methods;
[0021] 2) In the jacking area on both sides of the existing railway 6, a row of protective piles 2 is respectively arranged in the foundation soil on both sides of the box body 1 to be jacked along the jacking route, and two adjacent protective piles 2 are arranged alternately , and then set a zigzag crown beam 3 on the top of each row of protective piles 2, thereby ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a box jacking method for performing correction on a deflection end by virtue of a jack in an oblique crossing jacking process. The method comprises the following steps: arranging a column of guard piles in foundation soil on each of two sides of a box to be jacked along the jacking path on two sides of an existing railway, wherein each adjacent two guard piles are arranged in a staggered mode; arranging a zigzag crown cantilever on the top of each column of guard piles, and forming multiple jack holes in the inner side face, which is close to the box body, of the crown cantilever; arranging lifting jacks in the jack holes; jacking the box body according to a traditional jacking method; and starting the lifting jacks in the jack holes in the crown cantilever on the deflection side when the center line of the box body deviates from a designed center line, and continuously jacking until the box body is jacked in place. The method has an obvious correction effect, correction can be performed by jacking and adjusting the jacking force of the lifting jacks according to the deflection amount, and the correction effect can be observed after jacking is ended; in addition, the correction precision is high, the jack opening number for correction can be inversely calculated according to the deflection torque calculated according to the box jacking process; moreover, the correction facility is simple in structure and convenient in operation.
Description
technical field [0001] The invention belongs to the technical field of railway construction, and in particular relates to a box body jacking method in which a pick is used to correct deviation at a deflection end during an oblique jacking process. Background technique [0002] With the rapid development of urban construction, the traffic volume is also increasing. When the existing railway crosses the highway, it is common practice to build a frame bridge under the existing railway to alleviate the traffic congestion caused by the railway line passing through the city. When some frame bridges cannot meet the traffic requirements due to their long service life or too small internal width, it is necessary to replace the old frame bridges with new ones. At present, the commonly used replacement method is the jacking method. This method is to remove the old frame bridge and dig out the soil below the bridge while using jacks (also called jacking picks) to place one or more sect...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityPatents(China)
IPC IPC(8): E01D21/00
Inventor王金海米万富刘伟李强邢纪伟
OwnerCHINA RAILWAY SIXTH GRP TIANJIN RAILWAY CONSTR