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Publish: 2021-04-25 04:45:39
1. 1 project overview
prestressed pipe pile is widely used in foundation engineering e to its high bearing capacity, convenient construction, low cost and stable pile quality. When it is used in uplift pile, there will be no cracks in the pile body within the effective preloading stress range, and the crack resistance performance is good, so as to improve the rability of the pile body
XX square is located in Pudong New Area, east of Chuansha Road, south of Miaogong green space and west of Pudong canal. The total construction area is 52575.6 square meters, the above ground construction area is 24407.7 square meters, and the underground construction area is 28167.9 square meters. There are two underground floors and three to five above ground floors. The foundation is pile foundation. According to the geotechnical exploration report, the design parameters of precast piles are shown in Table 1< According to the characteristics of the project and after comparison, phc500ab100-27 is finally adopted as uplift pile, and the Reference Atlas is prestressed concrete pipe pile (atlas No. 10g409)< According to table 1, the bearing layer at the end of the pile is layer 7 1 sandy silt, and the design value of the single pile uplift bearing capacity of phcab500 pipe pile RTD = 680kn can be obtained
2.2 checking calculation of pile structure strength
the vertical bearing capacity of uplift pile not only meets the uplift bearing capacity of pile-soil interaction, but also meets the strength requirements of PHC pipe pile itself. According to formula 6.4.2 of national standard atlas prestressed concrete pipe pile (atlas No. 10g409),
Ao = a + [(ES / EC) - 1] AP = 3.14x (5002-3002) / 4 + (2x105 / 3.8x104-1) x11x90 = 129820m2
Ao = a + [(ES / EC) - 1] AP = 3.14x (5002-3002) / 4 + (2x105 / 3.8x104-1) σ ce=6.59MPa
Nk= σ CEAO = 855kn
when the pile is tested, it is controlled as NK when there is no crack= σ CE + FTK) Ao = (6.59 + 3.11) x129820 = 1259kn
2.3 checking calculation of joint strength of pile joint weld
the joint connection between upper and lower pipe piles is generally divided into mechanical quick joint and groove butt girth welding joint, and the common practice in Shanghai is groove butt girth welding joint
the welded joint between the upper and lower pipe piles shall be constructed according to page 40 of the national standard atlas. For example, the weld size is 12mm, as shown in Figure 1
D1 = d-2x12 = 500-24 = 476mm
weld length LW= π D1 = 3.14x476 = 1494mm, weld size he = 0.75s = 0.75x12 = 9mm
ft = 160n / mm2
q = lwhet / 1.2 = 1494x9x160 / 1.2 = 1792kn
Fig.1 detailed drawing of welding connection between upper and lower pipe piles, The quality is not easy to guarantee, and the cooling time of the weld is not enough, resulting in the formation of weld quenching after the weld is buried in the soil at high temperature
2.4 checking calculation of shear strength of orifice end plate
the weakest part of orifice is the anchor hole step of prestressed steel bar on end plate, which is prone to punching failure, as shown in Figure 1. According to the national standard pipe pile
Fig.2 connection details of end plate and prestressed reinforcement
according to the national standard atlas TS = 20mm, the shear design value of end plate orifice is checked as follows:
n ≤ n л(( D1 + D2) / 2) (TS - (H1 + H2) / 2) FV
= 11x3.14x ((12 + 20) / 2) (20 - (9.5 + 6) / 2) X120 = 812kn
it is suggested that B-type or C-type pile should be used for test pile and engineering pile, and the end plate should be thickened to improve the shear strength of the end plate orifice. The end plate TS = 28mm, and the corresponding shear strength design value is 1450kn
the shear strength of orifice end plate is the control index of pile strength. According to section 5.3 of the atlas "prestressed concrete pipe pile", when the pipe pile is used as uplift pile, the pile end anchor bar should be set according to the specific requirements, and the end plate connection should be strengthened. If additional anchor bars are set at the pile end, the stress state of the orifice end plate will be greatly improved< br />
prestressed pipe pile is widely used in foundation engineering e to its high bearing capacity, convenient construction, low cost and stable pile quality. When it is used in uplift pile, there will be no cracks in the pile body within the effective preloading stress range, and the crack resistance performance is good, so as to improve the rability of the pile body
XX square is located in Pudong New Area, east of Chuansha Road, south of Miaogong green space and west of Pudong canal. The total construction area is 52575.6 square meters, the above ground construction area is 24407.7 square meters, and the underground construction area is 28167.9 square meters. There are two underground floors and three to five above ground floors. The foundation is pile foundation. According to the geotechnical exploration report, the design parameters of precast piles are shown in Table 1< According to the characteristics of the project and after comparison, phc500ab100-27 is finally adopted as uplift pile, and the Reference Atlas is prestressed concrete pipe pile (atlas No. 10g409)< According to table 1, the bearing layer at the end of the pile is layer 7 1 sandy silt, and the design value of the single pile uplift bearing capacity of phcab500 pipe pile RTD = 680kn can be obtained
2.2 checking calculation of pile structure strength
the vertical bearing capacity of uplift pile not only meets the uplift bearing capacity of pile-soil interaction, but also meets the strength requirements of PHC pipe pile itself. According to formula 6.4.2 of national standard atlas prestressed concrete pipe pile (atlas No. 10g409),
Ao = a + [(ES / EC) - 1] AP = 3.14x (5002-3002) / 4 + (2x105 / 3.8x104-1) x11x90 = 129820m2
Ao = a + [(ES / EC) - 1] AP = 3.14x (5002-3002) / 4 + (2x105 / 3.8x104-1) σ ce=6.59MPa
Nk= σ CEAO = 855kn
when the pile is tested, it is controlled as NK when there is no crack= σ CE + FTK) Ao = (6.59 + 3.11) x129820 = 1259kn
2.3 checking calculation of joint strength of pile joint weld
the joint connection between upper and lower pipe piles is generally divided into mechanical quick joint and groove butt girth welding joint, and the common practice in Shanghai is groove butt girth welding joint
the welded joint between the upper and lower pipe piles shall be constructed according to page 40 of the national standard atlas. For example, the weld size is 12mm, as shown in Figure 1
D1 = d-2x12 = 500-24 = 476mm
weld length LW= π D1 = 3.14x476 = 1494mm, weld size he = 0.75s = 0.75x12 = 9mm
ft = 160n / mm2
q = lwhet / 1.2 = 1494x9x160 / 1.2 = 1792kn
Fig.1 detailed drawing of welding connection between upper and lower pipe piles, The quality is not easy to guarantee, and the cooling time of the weld is not enough, resulting in the formation of weld quenching after the weld is buried in the soil at high temperature
2.4 checking calculation of shear strength of orifice end plate
the weakest part of orifice is the anchor hole step of prestressed steel bar on end plate, which is prone to punching failure, as shown in Figure 1. According to the national standard pipe pile
Fig.2 connection details of end plate and prestressed reinforcement
according to the national standard atlas TS = 20mm, the shear design value of end plate orifice is checked as follows:
n ≤ n л(( D1 + D2) / 2) (TS - (H1 + H2) / 2) FV
= 11x3.14x ((12 + 20) / 2) (20 - (9.5 + 6) / 2) X120 = 812kn
it is suggested that B-type or C-type pile should be used for test pile and engineering pile, and the end plate should be thickened to improve the shear strength of the end plate orifice. The end plate TS = 28mm, and the corresponding shear strength design value is 1450kn
the shear strength of orifice end plate is the control index of pile strength. According to section 5.3 of the atlas "prestressed concrete pipe pile", when the pipe pile is used as uplift pile, the pile end anchor bar should be set according to the specific requirements, and the end plate connection should be strengthened. If additional anchor bars are set at the pile end, the stress state of the orifice end plate will be greatly improved< br />
2.
If illegal quarrying is in violation of the provisions of the mineral resources law and refuses to stop mining after being ordered to stop mining, thus causing damage to mineral resources, it shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance and shall also, or shall only, be fined; Whoever causes serious damage to mineral resources shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years and shall also be fined
according to Article 343 of the criminal law of the people's Republic of China, those who, in violation of the provisions of the mineral resources law, mine without a mining license, enter the state planned mining areas, mining areas of great value to the national economy and other mining areas, and exploit specific minerals that are protected by the state regulations without authorization, Whoever refuses to stop mining after being ordered to do so, thus causing damage to mineral resources, shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance and shall also, or shall only, be fined; Whoever causes serious damage to mineral resources shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years and shall also be fined
Those who, in violation of the provisions of the mineral resources law, exploit mineral resources by destructive mining methods, causing serious damage to mineral resources, shall be sentenced to fixed-term imprisonment of not more than five years or criminal detention and shall also be finedextended data:
Article 39 of the mineral resources law of the people's Republic of China violates the provisions of this law, mines without a mining license, mines in a mining area that is planned by the state and of great value to the national economy, and mines specific minerals that are protected by the state, shall be ordered to stop mining Compensate for the losses, confiscate the mined mineral procts and illegal income, and may concurrently impose a fine; Those who refuse to stop mining and cause damage to mineral resources shall be investigated for criminal responsibility in accordance with the relevant provisions of the criminal law
Units and indivials who enter the mining areas of state-owned mining enterprises and other mining enterprises established by others according to law shall be punished in accordance with the provisions of the preceding paragraph3.
Illegal activities of mineral resources:
according to mineral resources exploration, mining, transfer, approval and registration, compensation fee collection, geological data collection, geological heritage protection, geological disaster prevention and control, the illegal activities of mineral resources can be classified, such as illegal exploration, illegal mining, illegal transfer, illegal approval, etc
from the practice of mineral resources law enforcement, the main illegal activities of mineral resources include exploration without license, mining without license, cross-border mining, illegal transfer, illegal approval of exploration and mining of mineral resources
it should be noted that in addition to the illegal acts of printing, forging or falsely using the exploration license and mining license without authorization, the other illegal acts suspected of constituting a crime should be transferred to the judicial organs for criminal responsibility by the relevant departments according to law
The investigation and punishment are as follows:according to Article 39 of the mineral resources law of the people's Republic of China, those who violate the provisions of this law, mine without a mining license, enter the state planned mining area, mine within the mining area of great value to the national economy, and mine specific minerals that are protected by the State shall be ordered to stop mining Compensate for the losses, confiscate the mined mineral procts and illegal income, and may concurrently impose a fine
Those who refuse to stop mining and cause damage to mineral resources shall be investigated for criminal responsibility in accordance with the relevant provisions of the criminal law Units and indivials who enter the mining areas of state-owned mining enterprises and other mining enterprises established by others according to law shall be punished in accordance with the provisions of the preceding paragraph Article 40 Anyone who mines beyond the approved mining area shall be ordered to return to the mining area for mining and compensate for the losses, and the mineral procts and illegal income from cross-border mining shall be confiscated and a fine may be imposed; Those who refuse to return to the mining area for mining and cause damage to mineral resources shall have their mining license revoked and the persons directly responsible shall be investigated for criminal responsibility in accordance with the relevant provisions of the criminal law Article 41 Anyone who steals or seizes mineral procts or other property of mining enterprises or exploration units, damages mining and exploration facilities, or disturbs the order of proction and work in mining areas and exploration areas shall be investigated for criminal responsibility in accordance with the relevant provisions of the criminal law; If the circumstances are obviously minor, it shall be punished in accordance with the relevant provisions of the law on administrative penalties for public security Article 42 Where mineral resources are sold, leased or transferred in other forms, the illegal gains shall be confiscated and a fine shall be imposed If anyone, in violation of the provisions of Article 6 of this law, resells the exploration right or mining right for profit, his exploration license or mining license shall be revoked, his illegal income shall be confiscated and he shall be fined Article 43 anyone who, in violation of the provisions of this law, purchases or sells mineral procts uniformly purchased by the State shall have his mineral procts and illegal income confiscated and may also be fined; If the circumstances are serious, criminal responsibility shall be investigated in accordance with the relevant provisions of the criminal law Article 44 anyone who, in violation of the provisions of this law, adopts destructive mining methods to mine mineral resources shall be fined and his mining license may be revoked; If serious damage is caused to mineral resources, the person directly responsible shall be investigated for criminal responsibility in accordance with the relevant provisions of the criminal law Article 45 The administrative penalties prescribed in articles 39, 40 and 42 of this Law shall be decided by the Department in charge of the administration of Geology and mineral resources of the people's government at or above the county level within the limits of authority prescribed by the Department in charge of Geology and mineral resources under the State Council. The administrative penalty prescribed in Article 43 shall be decided by the administrative department for Instry and Commerce of the people's government at or above the county level The administrative penalty stipulated in Article 44 shall be decided by the Department in charge of Geology and mineral resources of the people's Government of the province, autonomous region or municipality directly under the central government. The punishment of revoking the exploration license or mining license shall be decided by the original license issuing organ If an administrative penalty should be imposed in accordance with the provisions of articles 39, 40, 42 and 44, but no administrative penalty is imposed, the Department in charge of Geology and mineral resources of the people's government at a higher level shall have the right to order correction or directly impose administrative penalty Article 46 If a party refuses to accept the decision on administrative penalty, he may apply for reconsideration in accordance with the law, or bring a suit directly to the people's court in accordance with the lawif the party concerned neither applies for reconsideration nor brings a lawsuit to the people's court within the time limit, nor complies with the punishment decision, the organ that made the punishment decision shall apply to the people's court for compulsory execution
Article 47 Any State functionary or other relevant state functionary in charge of the supervision and administration of the exploration and exploitation of mineral resources who engages in malpractices for personal gain, abuses his power or neglects his ty, approves the exploration and exploitation of mineral resources and issues exploration or mining licenses in violation of the provisions of this law, or fails to stop or punish illegal mining activities according to law, thus constituting a crime, Investigate criminal responsibility according to law Those who do not constitute a crime shall be given administrative sanctions. The Department in charge of Geology and mineral resources of the people's government at a higher level shall have the right to cancel the exploration license and mining license illegally issued Article 48 those who obstruct state functionaries engaged in the supervision and administration of mineral resources exploration and exploitation from performing their ties according to law by means of violence or threat shall be investigated for criminal responsibility in accordance with the relevant provisions of the criminal law; Those who refuse or hinder state functionaries engaged in the supervision and administration of mineral resources exploration and mining from performing their ties according to law without violence or threat shall be punished by the public security organs in accordance with the provisions of the law on administrative penalties for public security Article 49 disputes over the scope of mining areas between mining enterprises shall be settled by the parties concerned through consultation. If consultation fails, the relevant local people's governments at or above the county level shall handle the disputes according to the scope of mining areas approved according to law; Disputes over the scope of mining areas that straddle provinces, autonomous regions and municipalities directly under the central government shall be settled by the people's governments of the provinces, autonomous regions and municipalities directly under the central government through consultation. If consultation fails, the disputes shall be handled by the State Council Article 16 of mineral resources law of the people's Republic of China mining of the following mineral resources shall be examined and approved by the Department in charge of Geology and mineral resources under the State Council, and a mining license shall be issued:(1) mineral resources in the mining areas planned by the state and of great value to the national economy
(2) mineral resources with large-scale or more mineral reserves available for exploitation outside the areas specified in the preceding paragraph (3) the specific minerals for which protective mining is prescribed by the state (4) mineral resources in the territorial sea and other sea areas under the jurisdiction of China (5) other mineral resources prescribed by the State Council The exploitation of specific minerals such as oil, natural gas and radioactive minerals can be examined and approved by the competent authorities authorized by the State Council, and a mining license can be issued For the mining of mineral resources other than those specified in the first and second paragraphs, if the reserve scale of the mineral resources available for mining is medium, the Department in charge of Geology and mineral resources of the people's Government of the province, autonomous region or municipality directly under the central government shall examine and approve and issue a mining license4. If the pull-out force is less than the tensile strength of reinforcement, the reinforcement can not be fully utilized; If it is greater than the tensile strength of the steel bar, the excess part has no effect, so the ideal state is the pull-out force = the tensile strength of the steel bar
in the reinforcement specification, there is the calculation of the length of the embedded bar, which is related to the concrete strength, the embedded bar glue and other factors. If the requirement of the length is met, the pull-out force will be greater than or equal to the tensile strength of the reinforcement.
in the reinforcement specification, there is the calculation of the length of the embedded bar, which is related to the concrete strength, the embedded bar glue and other factors. If the requirement of the length is met, the pull-out force will be greater than or equal to the tensile strength of the reinforcement.
5. The unit accepting the report should be the land and Resources Supervision Brigade, which is a public institution directly under the Bureau of land and resources. Its main work is to accept, file, investigate, collect evidence, investigate and deal with cases of illegal land use< The crime of illegal mining (article 343, paragraph 1, of the criminal law) refers to those who violate the provisions of the law of the people's Republic of China on the protection of mineral resources, mine without a mining license, enter the state planned mining areas, mining areas of great value to the national economy and other people's mining areas, and exploit specific minerals that are protected by the state regulations, Refusing to stop mining after being ordered to stop mining, thus causing damage to mineral resources.
6. The code for design of concrete structures (GB 50010
includes the calculation of anchorage length of reinforcement
if your length meets the requirements of anchorage length, then the load you bear is the load that the reinforcement bears.
if your length fails to meet the requirements of anchorage length, then the load you bear is the load of anchorage, which cannot reach the bearing capacity of reinforcement.
includes the calculation of anchorage length of reinforcement
if your length meets the requirements of anchorage length, then the load you bear is the load that the reinforcement bears.
if your length fails to meet the requirements of anchorage length, then the load you bear is the load of anchorage, which cannot reach the bearing capacity of reinforcement.
7. This kind of question, I can basically answer, and I need to find a master to give you,,... Shame, brother Yang
8. Unknown_Error
9. If it constitutes the crime of illegal mining, it shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention, public surveillance or fine. However, if serious damage to resources is caused, it will be more than three years and less than seven years, and a fine will be imposed
10. Drawing calculation of embedded bar: n = as × FY
as: reinforcement area
FY: design value of tensile strength of reinforcement
determined by pull-out test< Basic regulations of pull-out test
theoretical basis: Code for design of reinforcement of concrete structures
I. the number of samples taken is 1% ~ 3, and the larger value is taken (the plate is a general component)
II. Nondestructive inspection,
1. Continuous loading system, loading to the set test load in 2 ~ 3 minutes at a uniform speed, and holding the load for 2 minutes
2. In the grading loading system, the set test load should be divided into 10 levels, each level should hold the test load for 1 minute, and hold the load for 2 minutes Any one is OK)
3. The load test value of the planting bar is 1.15nt (NT is the design value of the tensile bearing capacity of the anchor connection, which should be provided by the design unit, and the inspection unit and other construction units have no right to determine on their own)
3. The test time
3 days at most on the day when the structural adhesive is completely cured< The loading capacity is at least 20% larger than the expected test load, and it can run continuously, stably and at a controllable speed
2. It can keep the alignment of the force line and the anchor axis< 5. Result evaluation
1. No local damage on appearance
2. All qualified are qualified
3. When one or more pieces are unqualified, another three pieces need to be taken for destructive test.
as: reinforcement area
FY: design value of tensile strength of reinforcement
determined by pull-out test< Basic regulations of pull-out test
theoretical basis: Code for design of reinforcement of concrete structures
I. the number of samples taken is 1% ~ 3, and the larger value is taken (the plate is a general component)
II. Nondestructive inspection,
1. Continuous loading system, loading to the set test load in 2 ~ 3 minutes at a uniform speed, and holding the load for 2 minutes
2. In the grading loading system, the set test load should be divided into 10 levels, each level should hold the test load for 1 minute, and hold the load for 2 minutes Any one is OK)
3. The load test value of the planting bar is 1.15nt (NT is the design value of the tensile bearing capacity of the anchor connection, which should be provided by the design unit, and the inspection unit and other construction units have no right to determine on their own)
3. The test time
3 days at most on the day when the structural adhesive is completely cured< The loading capacity is at least 20% larger than the expected test load, and it can run continuously, stably and at a controllable speed
2. It can keep the alignment of the force line and the anchor axis< 5. Result evaluation
1. No local damage on appearance
2. All qualified are qualified
3. When one or more pieces are unqualified, another three pieces need to be taken for destructive test.
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