Usually, when we are working in water, we first enclose water, then dig the foundation after pumping water and pour the foundation concrete; Or, build a steel pipe pile platform in the water, drive the steel casing, and then put a drilling machine on the platform to drill the bored pile and fill the concrete in the pile body. ......
Open caisson construction is to complete the above-mentioned process of enclosing water and digging foundation at one time, that is, to make steel members with bottomless barrels larger than the underwater foundation with profiled steel and steel plates, and then put them into the underwater foundation excavation position to pump water to dig the foundation ...... After the underwater work is completed, the steel buckets are removed (recycled); Or simply make a bucket of reinforced concrete, put it in the foundation excavation, dig it to the depth of foundation excavation, then clear the bottom and pour the foundation concrete, so that the reinforced concrete open caisson will not be recycled as a part of the foundation.
Question 2: What are the general requirements for open caisson construction? The following are the general requirements for open caisson construction in the teaching materials, please refer to them.
First, before the sinking of the open caisson, it is necessary to decide whether to supplement the construction exploration according to the geological data provided by the design unit, so as to provide an accurate basis for the preparation of the technical scheme.
Second, before the sinking of open caisson, effective protective measures should be taken for dams, buildings and construction equipment near open caisson, and settlement observation should be carried out frequently during the sinking process to observe the setting of baseline and base point.
3. Before the open caisson construction, the flood, ice flood, riverbed erosion, navigation and floating objects during the construction period should be investigated in detail, and specific measures should be formulated according to the investigation to ensure safety.
Question 3: What is open caisson construction? Don't copy open caisson. It is a top-down' top-down' construction method, which is used for digging piles, digging wells and other projects.
Using precast concrete or cast-in-place concrete or masonry cylinder wall, workers go down to dig and hollow out the soil layer under the cylinder wall, so that the gravity of the cylinder wall sinks evenly, and so on, so that the cylinder wall gradually goes underground to reach the required depth.
Question 4: How many steps are there in open caisson construction? Open caisson construction steps:
1. Level the site, lay wood and make bottom open caisson.
2. Dismantle the form, and at the root of the blade, while filling sand, symmetrically pull out the skids.
3. Dig open caissons at all ridges and sink at the bottom.
4. Build the second open caisson, continue to excavate and sink, and connect the next shaft wall.
5. Sink to the design elevation and clean the foundation.
6. Open caisson bottom sealing treatment
7. Design and capping of construction wells, etc.
Question 5: What is the principle of open caisson construction? Open caisson construction is to make an axial structure (open caisson) on the surface, and then dig it out of the well under the protection of the borehole wall, so that the open caisson gradually sinks under the action of its own weight, and then seal the internal stalk structure.
Widely used as the foundation of bridges, chimneys and water towers; Deep well structures such as water pump house, underground oil depot and pool well.
Question 6: What are the main contents of open caisson foundation construction? The main contents of open caisson foundation construction include open caisson fabrication, sinking, basement cleaning, bottom sealing, filling and pouring cover plate. The basic construction method of open caisson sinking is to dig in water without drainage, but the soil volume is not large, and drainage method can be used to sink when the groundwater is small.
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Question 7: What are the parts of open caisson? According to its cross-sectional profile, open caissons have three sizes: round, rectangular and round-ended. ① The flow resistance of circular open caisson is small. Under the same area, compared with other types, the circumference is the smallest, and the friction resistance is reduced accordingly, which is convenient for sinking; The shaft wall only bears axial pressure, and there is no deviation around the axis. ② Compared with the circular caisson with the same area, the rectangular caisson has larger moment of inertia and core radius, which is beneficial to the stress on the base; Under the action of lateral pressure, the outer wall of open caisson bears great bending stress. (3) Round-ended open caisson has good adaptability to supporting buildings, and can also make full use of foundation masonry. The stress on the shaft wall is improved compared with rectangular open caisson, but the construction is more complicated.
Question 8: What does open caisson mean? It's a way of killing people, that is, pushing people into a well to kill them.
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In addition, it is an engineering term.
The sewage collection device is built on the foundation pit, sunk to a certain elevation by a long-arm excavator, and then connected into a whole by a pipe jacking. Make the chute and cover it. The cover plate is generally cast-in-situ, with good compactness and short prefabrication period.
Open caisson foundation is a kind of underground structure and deep foundation built by open caisson method. Firstly, an axial structure (open caisson) is made on the surface, and then under the protection of the shaft wall, it is continuously excavated from the well to make the open caisson sink gradually under the action of its own weight, and then the internal structure is sealed at the bottom.
Widely used as the foundation of bridges, chimneys and water towers; Deep well structures such as pump house, underground oil depot, pool well, shield or pipe jacking working well.
Technically, it is safe and reliable, with less excavation, less impact on adjacent buildings, deep buried open caisson foundation, good stability, and can bear large loads.
Question 9: What are the characteristics of open caisson construction? Characteristics of open caisson construction project:
(1) There are many projects in this project, involving a wide range and complicated structure.
(2) The open caisson is deep and has a large area.
(3) Soft soil foundation construction, segmented settlement, settlement speed is difficult to control.
(4) The underground and surface water are abundant, and the eighth and fifth ponds are in the east, so it is difficult to dewatering, dry digging and dry sealing at well points.
(5) The construction of pumping station is in high temperature and rainy season, and a large amount of rainfall will affect the construction. Therefore, rainy season construction measures should be taken to ensure the smooth progress of construction.
(6) In recent years, many quality and safety problems have been exposed in the field of engineering construction in China, and some major quality and safety accidents have occurred, and some even caused great losses to people and property. The course is very in-depth Therefore, we should carefully manage and construct, and do our best to ensure the construction quality of industrial buildings and the quality and safety accidents of phenol cannons.
In view of the above engineering characteristics, we will be equipped with technical, quality inspection, safety and civilized management personnel with strong business ability to manage the hidden site, select a team with rich experience in open caisson construction for construction, and formulate and implement construction technical measures. Strictly implement construction specifications and procedures. Complete the construction task of this pumping station with high quality, high efficiency, low consumption, safety and civilization.
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