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Introduction to the relay room

Introduction to the relay room

  • Categories:Engineering case
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  • Time of issue:2020-04-03 12:03
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(Summary description)In the long-distance jacking pipe, the closed annular chamber used for segment jacking and set in the middle of the pipe section is generally made of steel, and jacks are arranged along the pipe ring. advantage The biggest advantage of this method is that it can shorten the length of the main section, thereby reducing the number of jacks and backs. When the culvert is too long, it is difficult to push in one time. It can be divided into two sections and used to push in by the relay method. During the jacking process, since the trajectories of the centers of gravity of the two nodes are not easy to overlap, relative dislocation and rotation will occur between the nodes. In order to ensure the continuity of two adjacent sections during jacking, a shear wedge or steel tower wedge that resists inter-node shear must be installed between the relays, or both shear wedges and steel tower wedges must be used at the same time. The required quantity: the type of I-beam, the number and diameter of U-bolts, etc., are all determined by the shear force. Precautions 1. The top stroke of the relay room should not exceed 20 cm each time. Excessive top stroke will increase the shear force, which will cause difficulties for the shear wedge and other facilities. 2. The steel sheath is designed to prevent soil from intruding into the box. The board width is determined by the extension of the jack plus 15 cm of overlap. Remember not to let the soil invade. The thickness of the plate is generally 8-10 mm, and the bolts with a pitch of 20-35 cm are fixed on the box body of the forward section. 3. The number of jacks depends on the required strength. 4. The placement methods of the jack are as follows: (1) Cut the steel bar at the end of the bottom plate of the forward section box in the relay room, leaving the nest of the pick, put the jack into the nest of the pick, and weld the cut steel after jacking it up, and pour it. Enter the concrete to restore it to the original method of the box. (2) The jack is placed on the bottom plate in the box, and the top wall is built at the end of the bottom plate. The cross-sectional size and configuration of the top wall are determined by the calculation of the jacking force. After the jacking is completed, the top wall is cut off. 5. At the relay joint, the connection of the water stop belt is very important. For example, if the water stop belt is not installed according to the general joint treatment, the uneven settlement of the structure often results in the failure of the joint water stop, so it is best to use Reserve the gap, and then set the rubber waterstop method, so that the waterstop can not only stop the water but also adapt to the settlement requirements of the structure. 6. When using prefabricated main structure, bolts must be filled, holes and slots must be reserved, steel sheath bottom plate and injection top wall must be set, or hanging mouth holes must be reserved.

Introduction to the relay room

(Summary description)In the long-distance jacking pipe, the closed annular chamber used for segment jacking and set in the middle of the pipe section is generally made of steel, and jacks are arranged along the pipe ring.

advantage

The biggest advantage of this method is that it can shorten the length of the main section, thereby reducing the number of jacks and backs. When the culvert is too long, it is difficult to push in one time. It can be divided into two sections and used to push in by the relay method. During the jacking process, since the trajectories of the centers of gravity of the two nodes are not easy to overlap, relative dislocation and rotation will occur between the nodes. In order to ensure the continuity of two adjacent sections during jacking, a shear wedge or steel tower wedge that resists inter-node shear must be installed between the relays, or both shear wedges and steel tower wedges must be used at the same time. The required quantity: the type of I-beam, the number and diameter of U-bolts, etc., are all determined by the shear force.

Precautions

1. The top stroke of the relay room should not exceed 20 cm each time. Excessive top stroke will increase the shear force, which will cause difficulties for the shear wedge and other facilities.

2. The steel sheath is designed to prevent soil from intruding into the box. The board width is determined by the extension of the jack plus 15 cm of overlap. Remember not to let the soil invade. The thickness of the plate is generally 8-10 mm, and the bolts with a pitch of 20-35 cm are fixed on the box body of the forward section.

3. The number of jacks depends on the required strength.

4. The placement methods of the jack are as follows: (1) Cut the steel bar at the end of the bottom plate of the forward section box in the relay room, leaving the nest of the pick, put the jack into the nest of the pick, and weld the cut steel after jacking it up, and pour it. Enter the concrete to restore it to the original method of the box. (2) The jack is placed on the bottom plate in the box, and the top wall is built at the end of the bottom plate. The cross-sectional size and configuration of the top wall are determined by the calculation of the jacking force. After the jacking is completed, the top wall is cut off.

5. At the relay joint, the connection of the water stop belt is very important. For example, if the water stop belt is not installed according to the general joint treatment, the uneven settlement of the structure often results in the failure of the joint water stop, so it is best to use Reserve the gap, and then set the rubber waterstop method, so that the waterstop can not only stop the water but also adapt to the settlement requirements of the structure.

6. When using prefabricated main structure, bolts must be filled, holes and slots must be reserved, steel sheath bottom plate and injection top wall must be set, or hanging mouth holes must be reserved.

  • Categories:Engineering case
  • Author:
  • Origin:
  • Time of issue:2020-04-03 12:03
  • Views:
Information
In the long-distance jacking pipe, the closed annular chamber used for segment jacking and set in the middle of the pipe section is generally made of steel, and jacks are arranged along the pipe ring.
 
advantage
 
The biggest advantage of this method is that it can shorten the length of the main section, thereby reducing the number of jacks and backs. When the culvert is too long, it is difficult to push in one time. It can be divided into two sections and used to push in by the relay method. During the jacking process, since the trajectories of the centers of gravity of the two nodes are not easy to overlap, relative dislocation and rotation will occur between the nodes. In order to ensure the continuity of two adjacent sections during jacking, a shear wedge or steel tower wedge that resists inter-node shear must be installed between the relays, or both shear wedges and steel tower wedges must be used at the same time. The required quantity: the type of I-beam, the number and diameter of U-bolts, etc., are all determined by the shear force.
 
Precautions
 
1. The top stroke of the relay room should not exceed 20 cm each time. Excessive top stroke will increase the shear force, which will cause difficulties for the shear wedge and other facilities.
 
2. The steel sheath is designed to prevent soil from intruding into the box. The board width is determined by the extension of the jack plus 15 cm of overlap. Remember not to let the soil invade. The thickness of the plate is generally 8-10 mm, and the bolts with a pitch of 20-35 cm are fixed on the box body of the forward section.
 
3. The number of jacks depends on the required strength.
 
4. The placement methods of the jack are as follows: (1) Cut the steel bar at the end of the bottom plate of the forward section box in the relay room, leaving the nest of the pick, put the jack into the nest of the pick, and weld the cut steel after jacking it up, and pour it. Enter the concrete to restore it to the original method of the box. (2) The jack is placed on the bottom plate in the box, and the top wall is built at the end of the bottom plate. The cross-sectional size and configuration of the top wall are determined by the calculation of the jacking force. After the jacking is completed, the top wall is cut off.
 
5. At the relay joint, the connection of the water stop belt is very important. For example, if the water stop belt is not installed according to the general joint treatment, the uneven settlement of the structure often results in the failure of the joint water stop, so it is best to use Reserve the gap, and then set the rubber waterstop method, so that the waterstop can not only stop the water but also adapt to the settlement requirements of the structure.
 
6. When using prefabricated main structure, bolts must be filled, holes and slots must be reserved, steel sheath bottom plate and injection top wall must be set, or hanging mouth holes must be reserved.
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