Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 29

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 32

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JRequest::clean() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 33

Strict Standards: Non-static method JRequest::_cleanArray() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/environment/request.php on line 463

Strict Standards: Non-static method JRequest::_cleanArray() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/environment/request.php on line 464

Strict Standards: Non-static method JRequest::_cleanArray() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/environment/request.php on line 465

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Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 35

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 38

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 39

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 46

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 47

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 50

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 53

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 54

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 57

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php on line 58

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JFactory::getApplication() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/index.php on line 31

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Redefining already defined constructor for class JObject in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/base/object.php on line 57

Strict Standards: Non-static method JApplication::getInstance() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 46

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JApplicationHelper::getClientInfo() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 130

Strict Standards: Declaration of JSite::getRouter() should be compatible with & JApplication::getRouter($name = NULL, $options = Array) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/includes/application.php on line 377

Strict Standards: Declaration of JSite::getPathWay() should be compatible with & JApplication::getPathway($name = NULL, $options = Array) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/includes/application.php on line 377

Strict Standards: Declaration of JSite::getMenu() should be compatible with & JApplication::getMenu($name = NULL, $options = Array) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/includes/application.php on line 377

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 730

Strict Standards: Non-static method JFactory::_createConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 73

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/registry/registry.php on line 19

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JUtility::getHash() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 99

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/utilities/utility.php on line 111

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 382

Strict Standards: Non-static method JFactory::getSession() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/application/application.php on line 768

Strict Standards: Non-static method JFactory::_createSession() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 94

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 501

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Declaration of JSession::set() should be compatible with JObject::set($property, $value = NULL) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 770

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 19

Strict Standards: Non-static method JSession::getInstance() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 507

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JSessionStorage::getInstance() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 108

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JFilterInput::clean() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/storage.php on line 57

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JFactory::getDBO() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/storage/database.php on line 64

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 268

Strict Standards: Non-static method JFactory::_createDBO() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 271

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JFactory::getConfig() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 551

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JDatabase::getInstance() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 563

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JError::isError() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/factory.php on line 565

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JTable::getInstance() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/storage/database.php on line 69

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JLoader::import() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 186

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 71

Strict Standards: Non-static method JLoader::load() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 161

Strict Standards: Non-static method JLoader::register() should not be called statically in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/loader.php on line 138

Strict Standards: Non-static method JPath::find() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/database/table.php on line 91

Strict Standards: Non-static method JTable::addIncludePath() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/database/table.php on line 91

Strict Standards: Non-static method JFactory::getDBO() should not be called statically, assuming $this from incompatible context in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/database/table.php on line 112

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php:29) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 423

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php:29) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 423

Warning: Cannot modify header information - headers already sent by (output started at /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/import.php:29) in /home/hoicd/domains/hoicdkhanhhoa.org.vn/public_html/libraries/joomla/session/session.php on line 426

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Phương pháp kiểm tra tọa độ tim
Thứ bảy, Tháng 10 21, 2017
   
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TIN MỚI

Phương Pháp kiểm tra tọa độ tim, độ nghiêng và góc xoay của cọc thép tròn sau khi đóng

Vấn đề : Thông thường trong công tác đóng cọc cầu cảng, sau khi đóng xong cọc, người giám sát phải tiếp cận với cọc để kiểm tra tọa độ tim, đo độ nghiêng và góc xoay của cọc. Phương pháp sau đây sẽ giúp người giám sát không cần ra tiếp cận cọc nhưng vẫn xác định được những thông số tọa độ cọc, độ nghiêng và góc xoay của cọc từ trên bờ. Mấu chốt là sử dụng hai máy toàn đạc điện tử có độ chính xác cao và ứng dụng công thức tính tọa độ điểm theo phép giao hội thuận. Có thể dùng một máy toàn đạc điện tử nhưng thời gian đo tăng gấp đôi

II.Giải trình phương pháp

Hiện trường : ví dụ cọc ống thép PA105 có tọa độ thiết kế (2000,100) và cao độ thiết kế +7.625. Góc xoay 15 độ và độ nghiêng 1:3.
Sau khi được đóng xong, nhu cầu kiểm tra tọa độ tim, độ nghiêng và góc xoay so với các giá trị thiết kế.
Các bước thực hiện như sau :
1. Thiết lập hai mốc trên bờ có thể quan sát được các cọc đã đóng. Hai mốc phải có tọa độ và cao độ theo hệ sử dụng cho dự án ( ví dụ VN2000 ). Hai mốc này có thể dùng cho
cả công trình hoặc thay đổi vị trí khác nếu cần thiết.
Ví dụ hai mốc đã thiết lập là L2 ( Xa,Ya,ha ) và M16 (Xb,Yb,hb ).
2. Đặt một máy toàn đạc điện tử độ chính xác 3” tại mốc L2.
3. Tính góc đứng để ngắm về cọc tại cao trình thiết kế như sau :
- Đo chiều cao máy ví dụ h1=1.455m
- Tính cao độ đường ngắm : Cao độ L2+ h1
- Tính khoảng cách D từ L2 đến cọc thiết kế theo công thức hai điểm đã biết tọa độ.
- Tính độ chênh cao :
Hc = Cao độ thiết kế cọc – (Cao độ L2+h1)
- Tính góc đứng : Đ1= Arctan( Hc / D )
Từ đó nâng ống kính theo góc Đ1 vừa tính để ngắm về cọc tại cao trình thiết kế ->điểm P1 .
4. Đo góc phương vị tim cọc tại cao trình thiết kế điểm P1. Để đạt độ chính xác cao, có thể đo góc tại cạnh bên trái và góc tại cạnh bên phải rồi lấy trị số góc trung bình chính là góc về hướng tim cọc.Ta có góc phương vị α1 của điểm P1.
5. Tính góc hiệu chỉnh để đo tại cao trình thấp hơn cao độ thiết kế 3m :
.                 góc hiệu chỉnh Đ2 = Arctan( 3/ D )

Ở đây dùng khoảng cách đến cọc là D đã tính ở trên vì hạ xuống 3 m khoảng cách thay đổi không nhiều.
6. Từ đó hạ ống kính một giá trị bằng góc vừa tính Đ2 ta có hướng ngắm về cao trình thấp hơn 3m so với cao độ thiết kế -> điểm P2.
7. Đo góc phương vị tim cọc tại cao trình thấp hơn 3m so với thiết kế. Để đạt độ chính xác cao, có thể đo góc tại cạnh bên trái và góc tại cạnh bên phải rồi lấy trị số góc trung bình chính là góc hướng tim cọc.Ta có góc phương vị α2 của điểm P2
8. Tương tự máy toàn đạc điện tử tại mốc M16 ta lập lại các thao tác tương tự để đo hai góc phương vị β1,β2 của điểm P1 và P2.
9. Tính tọa độ điểm theo công thức GAUSS của phương pháp giao hội thuận có hai mốc là L2 (Xa,Ya) và M16 ( Xb,Yb) :

XP1=(Xatanα1-Xbtanβ1 -Ya +Yb)/(tanα1-tanβ1)


Y
P1=Ya+tanα1*(
XP1-Xa)

XP2=(Xatanα2-Xbtanβ2 -Ya +Yb)/(tanα2-tanβ2)


Y
P2=Ya+tanα2*(
XP2-Xa)

Tọa độ điểm P1 chính là tọa độ tim cọc sau khi đóng. Ta so sánh với giá trị thiết kế để đánh giá nghiệm thu.
10. Tính khoảng cách hai điểm P1 P2 theo công thức hai điểm đã biết tọa độ :


D2 =√(Xp1 -Xp2)2+(Yb1-Yb2)2


11. Tính độ nghiêng của cọc :


D2 / 3 ( vì 3m là độ chênh cao đã định khi đo )


12. Tính góc xoay của cọc so với trục tọa độ :
Góc xoay = Arctan {(Yp1-Yp2)/(Xp1-Xp2)}
So sánh độ nghiêng và góc xoay với giá trị thiết kế để nghiệm thu.

III. Nhận xét
Giải trình thì dài dòng nhưng khi thực hành chúng ta chỉ cần tính hai góc đứng bằng máy tính cầm tay và đo 4 góc nằm.
Các khoảng cách và tọa độ đều được tính tại văn phòng bằngbảng tính EXCEL lập sẵn các công thức.
Độ chính xác sử dụng được cho xây dựng công trình cầu cảng.
Năng suất có thể đạt 20 cọc một ngày kể cả tính và in kết quả.
Khoảng cách từ bờ ra tùy theo khả năng của máy toàn đạc điện tử, có thể dùng trong khoảng 1000m -2000m.
Sẽ có hình minh họa sau bằng CAD.

Ngày 15/12/2010
Người trình bày : Nguyễn Ngọc Phụng - 822SC
Công trường : Kho xăng dầu ngoại quan Vân Phong
Hình minh họa phương pháp giao hội thuận

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