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Advantages and common problems of relay room

Advantages and common problems of relay room

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  • Time of issue:2020-04-28 08:33
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(Summary description)The greater advantage of the relay room can reduce the length of the large section, thereby reducing the total number of hydraulic jacks and the back. When the culvert is too long, it is difficult to push in at one time, so it can be divided into two sections to choose the method of jacking in between relays. In the whole process of jacking, because the trajectories of the center of gravity of the two nodes are not easy to overlap, relative displacement and rotation will occur between the nodes. To ensure the continuity of the adjacent two nodes during jacking, be sure to relay Set the shear stress wedge or steel tower wedge to resist the cutting of the pitch, or the shear stress wedge and the steel tower wedge are used separately; the total number required: the type and specification of the I-shaped steel, the total number and diameter of the U-shaped anchor bolts And so on, are all defined by the shear stress size. Common problems between relays: 1. Each jacking stroke of the relay room is not suitable to exceed 20cm. The jacking stroke will cause the expansion of the shear stress, which will make the shear stress wedge and other equipment difficult. 2. The steel wire sheath is designed to avoid soil intrusion into the shell. Therefore, the width of the plate is determined by the extension of the hydraulic jack plus the overlap of 15cm of steel bars, so that the soil cannot be invaded. The thickness of the plate can generally be 8-10mm. And anchor bolts with a pitch of 20 to 35 cm are fixed on the shell of the forward section. 3. The total number of hydraulic jacks is determined by the full size required. 4. There are two ways to place the hydraulic jack: (1) Disconnect the building steel bars under the bottom end of the shell bottom plate of the relay room to empty the pick socket, and then put the hydraulic jack into the pick socket to carry out jacking. After the jacking is completed, weld the broken building steel bars. Note Slurry concrete repairs the shell in its original state. (2) Put the hydraulic jack on the bottom plate of the box culvert, and build the top wall at the top of the bottom plate. The cross-sectional specifications of the top wall and the amount of bending resistance building steel bars are determined according to the full size. After the jacking is completed, the top wall is chiseled off. . 5. At the interface between the relays, the connection of the rubber waterstop is very important. For example, if it is solved according to the general joints, when the rubber waterstop is not installed, the ground subsidence is usually due to uneven structure, which causes the water to stop at the joint. The band is invalid. Therefore, it is best to use the method of pre-buried vacancies and then set up waterstops, so that the rubber waterstops can not only stop the water but also integrate into the foundation settlement regulations of the structure. 6. In the main project of prefabricated components, bolts, holes and grooves should be embedded, steel protective wire sleeve bottom plate and grouting top wall or embedded pick sockets should be additionally embedded.

Advantages and common problems of relay room

(Summary description)The greater advantage of the relay room can reduce the length of the large section, thereby reducing the total number of hydraulic jacks and the back. When the culvert is too long, it is difficult to push in at one time, so it can be divided into two sections to choose the method of jacking in between relays. In the whole process of jacking, because the trajectories of the center of gravity of the two nodes are not easy to overlap, relative displacement and rotation will occur between the nodes. To ensure the continuity of the adjacent two nodes during jacking, be sure to relay Set the shear stress wedge or steel tower wedge to resist the cutting of the pitch, or the shear stress wedge and the steel tower wedge are used separately; the total number required: the type and specification of the I-shaped steel, the total number and diameter of the U-shaped anchor bolts And so on, are all defined by the shear stress size.



Common problems between relays:
1. Each jacking stroke of the relay room is not suitable to exceed 20cm. The jacking stroke will cause the expansion of the shear stress, which will make the shear stress wedge and other equipment difficult.
2. The steel wire sheath is designed to avoid soil intrusion into the shell. Therefore, the width of the plate is determined by the extension of the hydraulic jack plus the overlap of 15cm of steel bars, so that the soil cannot be invaded. The thickness of the plate can generally be 8-10mm. And anchor bolts with a pitch of 20 to 35 cm are fixed on the shell of the forward section.
3. The total number of hydraulic jacks is determined by the full size required.
4. There are two ways to place the hydraulic jack:
(1) Disconnect the building steel bars under the bottom end of the shell bottom plate of the relay room to empty the pick socket, and then put the hydraulic jack into the pick socket to carry out jacking. After the jacking is completed, weld the broken building steel bars. Note Slurry concrete repairs the shell in its original state.
(2) Put the hydraulic jack on the bottom plate of the box culvert, and build the top wall at the top of the bottom plate. The cross-sectional specifications of the top wall and the amount of bending resistance building steel bars are determined according to the full size. After the jacking is completed, the top wall is chiseled off. .
5. At the interface between the relays, the connection of the rubber waterstop is very important. For example, if it is solved according to the general joints, when the rubber waterstop is not installed, the ground subsidence is usually due to uneven structure, which causes the water to stop at the joint. The band is invalid. Therefore, it is best to use the method of pre-buried vacancies and then set up waterstops, so that the rubber waterstops can not only stop the water but also integrate into the foundation settlement regulations of the structure.
6. In the main project of prefabricated components, bolts, holes and grooves should be embedded, steel protective wire sleeve bottom plate and grouting top wall or embedded pick sockets should be additionally embedded.

  • Categories:news
  • Author:
  • Origin:
  • Time of issue:2020-04-28 08:33
  • Views:
Information
The greater advantage of the relay room can reduce the length of the large section, thereby reducing the total number of hydraulic jacks and the back. When the culvert is too long, it is difficult to push in at one time, so it can be divided into two sections to choose the method of jacking in between relays. In the whole process of jacking, because the trajectories of the center of gravity of the two nodes are not easy to overlap, relative displacement and rotation will occur between the nodes. To ensure the continuity of the adjacent two nodes during jacking, be sure to relay Set the shear stress wedge or steel tower wedge to resist the cutting of the pitch, or the shear stress wedge and the steel tower wedge are used separately; the total number required: the type and specification of the I-shaped steel, the total number and diameter of the U-shaped anchor bolts And so on, are all defined by the shear stress size.
 
 
 
  Common problems between relays:
1. Each jacking stroke of the relay room is not suitable to exceed 20cm. The jacking stroke will cause the expansion of the shear stress, which will make the shear stress wedge and other equipment difficult.
2. The steel wire sheath is designed to avoid soil intrusion into the shell. Therefore, the width of the plate is determined by the extension of the hydraulic jack plus the overlap of 15cm of steel bars, so that the soil cannot be invaded. The thickness of the plate can generally be 8-10mm. And anchor bolts with a pitch of 20 to 35 cm are fixed on the shell of the forward section.
3. The total number of hydraulic jacks is determined by the full size required.
4. There are two ways to place the hydraulic jack:
(1) Disconnect the building steel bars under the bottom end of the shell bottom plate of the relay room to empty the pick socket, and then put the hydraulic jack into the pick socket to carry out jacking. After the jacking is completed, weld the broken building steel bars. Note Slurry concrete repairs the shell in its original state.
(2) Put the hydraulic jack on the bottom plate of the box culvert, and build the top wall at the top of the bottom plate. The cross-sectional specifications of the top wall and the amount of bending resistance building steel bars are determined according to the full size. After the jacking is completed, the top wall is chiseled off. .
5. At the interface between the relays, the connection of the rubber waterstop is very important. For example, if it is solved according to the general joints, when the rubber waterstop is not installed, the ground subsidence is usually due to uneven structure, which causes the water to stop at the joint. The band is invalid. Therefore, it is best to use the method of pre-buried vacancies and then set up waterstops, so that the rubber waterstops can not only stop the water but also integrate into the foundation settlement regulations of the structure.
6. In the main project of prefabricated components, bolts, holes and grooves should be embedded, steel protective wire sleeve bottom plate and grouting top wall or embedded pick sockets should be additionally embedded.
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