What are the effects of pile groups on slope stability?
Soil moisture on the slopes of Hong Kong usually consists of colluvium and rock weathering on fresh. Groundwater flow of the sloping terrain, and can participate in the race and the flow of water main. As the permeability of the soil tends to decrease with depth, the flow of groundwater can occur above the water table, which includes a tour of the lower surface of the water. The presence of a lot of teams below the water table to prevent the flow of groundwater, which increases the level of groundwater. Significant developments in the slopes with a lot of influence has its roots in a sort groundwater is cut off. Growth of the lower surface of the water due to the effects of dam groups reduce the pile of slope stability, reducing the shear strength of the soil and eventually lead to failures slope.
The rise in groundwater levels tend to increase with the angle of the slope and
depth of groundwater.
What are the problems associated with prestressed concrete piles The origin of Daido piles come from Japan where the prestressed concrete piles used as a replacement layer. The holes are pre-formed in the soil and the batteries are placed inside these holes Daido pre-formed with subsequent sealing of the cavity between the studs and the adjacent land. However, in Hong Kong Daido piles are constructed by driving into the ground by hammers instead of the replacement method originally conceived. Since the installation method of Daido piles are modified design problems that the deformation of the shoe pile tip, the crushing of concrete at the pile tip, etc. occur. See BW Choy (1993).
If compression is used to freshly placed concrete piles? In normal practice, belief in self-compression of concrete designed to produce mixtures of adequate compression. The use of the vibrating poker vibrators are rarely adopted for the compaction system
concrete piles. In fact, apart from considerations of the impracticality of using vibrating device in long piles there is serious concern about the possible presence of total lock in with the extraction of underwear problems. In the worst case scenario, temporary enclosures and cages frames extracted by lifting the pile of intestines. This is another reason that accounts for not using vibrating machines to piles of mining clothes.
Is the quality of concrete deterioration due to free fall method of concrete placement in the bored piles?
Based on studies of STS Consultants Ltd., it was found that the concrete set in a free fall of less than 120 feet do not have the problem of segregation and the concrete would not be adversely affected, provided that the "pile hole and the ground is dry and free of debris. Furthermore, it has been suggested previously that during the free fall of concrete into a pile of concrete falls hitting the holes in the strengthening of the cage to cause segregation. However, in accordance with experimental results from STS Consultants Ltd., a large cage of fresh concrete reinforcement has no significant effect on concrete
In addition, long bored piles, it is not practical to perform concrete vibration. Concrete set of free fall of the method, the shock caused by the free fall should be sufficient to cause vibration. On the other hand, the concrete method Tremie September seems to be a lack of vibration and this may affect the strength and integrity of the concrete. The results showed that the strength of the vibration of the concrete was slightly higher than actual unvibrated. Increased vibration turned out to be real advantage but not essential force to plan a lot of strength.
Why sheath used in bunkers built on the slopes?
For the skyscrapers built on steep slopes cut in buildings are usually supported by piles of large diameter. Although the depth of piles based on some tracks, due to lateral wind loads on buildings can cause failures and cause slop slope. Depth gradient is somewhat unstable, prone to failure slope.
Therefore, a ring of compressible material called a sheath is inserted into cells in order to reduce the lateral load transfer, the buildings of the tracks.
What is the purpose of sealing the root of the tree? Grout in the operation of the trees, the tubes of tube-to-cuff is fixed in a regular space reinforcement cage. After the concrete strips / drilled shafts, a small volume of water injected at high pressure in the pipes to break the concrete. The cracking process must be carried out within 24 hours after concreting. The aim of cracking is to create a way for the suspension to pass. About a week after the concreting of the strip, the slurry is then performed in the hoses to improve friction between the foundation and surrounding soil.
Can hammer down a hole under the bottom surface of the water?
Soil moisture on the slopes of Hong Kong usually consists of colluvium and rock weathering on fresh. Groundwater flow of the sloping terrain, and can participate in the race and the flow of water main. As the permeability of the soil tends to decrease with depth, the flow of groundwater can occur above the water table, which includes a tour of the lower surface of the water. The presence of a lot of teams below the water table to prevent the flow of groundwater, which increases the level of groundwater. Significant developments in the slopes with a lot of influence has its roots in a sort groundwater is cut off. Growth of the lower surface of the water due to the effects of dam groups reduce the pile of slope stability, reducing the shear strength of the soil and eventually lead to failures slope.
The rise in groundwater levels tend to increase with the angle of the slope and
depth of groundwater.
What are the problems associated with prestressed concrete piles The origin of Daido piles come from Japan where the prestressed concrete piles used as a replacement layer. The holes are pre-formed in the soil and the batteries are placed inside these holes Daido pre-formed with subsequent sealing of the cavity between the studs and the adjacent land. However, in Hong Kong Daido piles are constructed by driving into the ground by hammers instead of the replacement method originally conceived. Since the installation method of Daido piles are modified design problems that the deformation of the shoe pile tip, the crushing of concrete at the pile tip, etc. occur. See BW Choy (1993).
If compression is used to freshly placed concrete piles? In normal practice, belief in self-compression of concrete designed to produce mixtures of adequate compression. The use of the vibrating poker vibrators are rarely adopted for the compaction system
concrete piles. In fact, apart from considerations of the impracticality of using vibrating device in long piles there is serious concern about the possible presence of total lock in with the extraction of underwear problems. In the worst case scenario, temporary enclosures and cages frames extracted by lifting the pile of intestines. This is another reason that accounts for not using vibrating machines to piles of mining clothes.
Is the quality of concrete deterioration due to free fall method of concrete placement in the bored piles?
Based on studies of STS Consultants Ltd., it was found that the concrete set in a free fall of less than 120 feet do not have the problem of segregation and the concrete would not be adversely affected, provided that the "pile hole and the ground is dry and free of debris. Furthermore, it has been suggested previously that during the free fall of concrete into a pile of concrete falls hitting the holes in the strengthening of the cage to cause segregation. However, in accordance with experimental results from STS Consultants Ltd., a large cage of fresh concrete reinforcement has no significant effect on concrete
In addition, long bored piles, it is not practical to perform concrete vibration. Concrete set of free fall of the method, the shock caused by the free fall should be sufficient to cause vibration. On the other hand, the concrete method Tremie September seems to be a lack of vibration and this may affect the strength and integrity of the concrete. The results showed that the strength of the vibration of the concrete was slightly higher than actual unvibrated. Increased vibration turned out to be real advantage but not essential force to plan a lot of strength.
Why sheath used in bunkers built on the slopes?
For the skyscrapers built on steep slopes cut in buildings are usually supported by piles of large diameter. Although the depth of piles based on some tracks, due to lateral wind loads on buildings can cause failures and cause slop slope. Depth gradient is somewhat unstable, prone to failure slope.
Therefore, a ring of compressible material called a sheath is inserted into cells in order to reduce the lateral load transfer, the buildings of the tracks.
What is the purpose of sealing the root of the tree? Grout in the operation of the trees, the tubes of tube-to-cuff is fixed in a regular space reinforcement cage. After the concrete strips / drilled shafts, a small volume of water injected at high pressure in the pipes to break the concrete. The cracking process must be carried out within 24 hours after concreting. The aim of cracking is to create a way for the suspension to pass. About a week after the concreting of the strip, the slurry is then performed in the hoses to improve friction between the foundation and surrounding soil.
Can hammer down a hole under the bottom surface of the water?
Down the hole hammer has been used extensively to form pre-bored holes as rock sockets for mini piles and pre-bored H piles. The hammer functions by driving repeatedly a drill bit using compressed air on the rock. However, the use of down the hole hammer is normally limited to hole diameter of 600mm.
In using down the hole hammer, compressed air serves to drive the drill bit and to expel the cuttings which are blown out to the air at ground level. However, for driving the hammer about 30m below ground water level, the air pressure has difficulty in coping with great water pressure. Moreover, blowing of cuttings by compressed air also dewaters the nearby soils. As a result, settlement of nearby ground may occur which is undesirable.
Why not reverse circulation drilling normal function of the conditions of the surface rocks?
Reverse circulation drill (RCD) is normally used for a large rock socket diameter. Method, strain, and download the power of cutting roller rock bits in a cycle of operations, and
grinding bit on the rock. The cuts are removed by reverse circulation. The water and cuttings are transported by air through a central drill pipe, which is also used to run the drill.
In order to facilitate the grinding action of rock, about 15 tons of force used in each cut. So great a little 'strength, drill core is intended to accommodate the body by binding to a bunch of boring posts. Therefore, during the
drilling activity, a lot of housing is prevented by increasing the weight of the drilling and casing pile and the friction developed in the pile and the body. Therefore, in shallow rock conditions, the reduced length of the pile of intestines, can affect the stability of the drilling RCD.
When clamps are used at work prestressed battery? The use of prestressed clamps get rid of the need for reinforcements in the interior. Tensioning clamps are anchored in the rocks and granular soils and searches can be done with a shovel instead of digging reach large and small blades. It offers fewer restrictions and allows free movement of the excavations.
Reverse circulation drill (RCD) is normally used for a large rock socket diameter. Method, strain, and download the power of cutting roller rock bits in a cycle of operations, and
grinding bit on the rock. The cuts are removed by reverse circulation. The water and cuttings are transported by air through a central drill pipe, which is also used to run the drill.
In order to facilitate the grinding action of rock, about 15 tons of force used in each cut. So great a little 'strength, drill core is intended to accommodate the body by binding to a bunch of boring posts. Therefore, during the
drilling activity, a lot of housing is prevented by increasing the weight of the drilling and casing pile and the friction developed in the pile and the body. Therefore, in shallow rock conditions, the reduced length of the pile of intestines, can affect the stability of the drilling RCD.
When clamps are used at work prestressed battery? The use of prestressed clamps get rid of the need for reinforcements in the interior. Tensioning clamps are anchored in the rocks and granular soils and searches can be done with a shovel instead of digging reach large and small blades. It offers fewer restrictions and allows free movement of the excavations.
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