人民黄河
人民黃河
인민황하
Yellow River
2014年
10期
97-99
,共3页
脱壁流%竖井式溢洪道%城门洞形断面%消力井
脫壁流%豎井式溢洪道%城門洞形斷麵%消力井
탈벽류%수정식일홍도%성문동형단면%소력정
weir overflow%shaft spillway%horseshoe section%water cushion pit
为解决大石门水电站峡谷河道工程布置困难问题，采用了竖井式溢洪道泄洪，并在竖井底部设消力井进行一级消能，以简化洞外消能工。工程布置采用加大溢洪道竖井直径，并以突然扩大断面的形式与进水喇叭口末端连接，利用通气管向突扩断面大量补气，使水体与井壁之间形成气幕，水流以脱离井壁的方式下泄，增加掺气，减轻空蚀破坏；将下游泄洪洞的城门洞形断面向上游旋转90o，形成断面形式为城门洞形消力井，这种断面形式不同于传统的圆形消力井，不仅简化了施工，而且有利于水流扩散，有效提高了消能效率。经模型试验验证，这种脱壁流竖井式溢洪道形体设计及参数符合设计要求，用于工程后，较好地解决了峡谷河道施工导流和总体布置的干扰问题。
為解決大石門水電站峽穀河道工程佈置睏難問題，採用瞭豎井式溢洪道洩洪，併在豎井底部設消力井進行一級消能，以簡化洞外消能工。工程佈置採用加大溢洪道豎井直徑，併以突然擴大斷麵的形式與進水喇叭口末耑連接，利用通氣管嚮突擴斷麵大量補氣，使水體與井壁之間形成氣幕，水流以脫離井壁的方式下洩，增加摻氣，減輕空蝕破壞；將下遊洩洪洞的城門洞形斷麵嚮上遊鏇轉90o，形成斷麵形式為城門洞形消力井，這種斷麵形式不同于傳統的圓形消力井，不僅簡化瞭施工，而且有利于水流擴散，有效提高瞭消能效率。經模型試驗驗證，這種脫壁流豎井式溢洪道形體設計及參數符閤設計要求，用于工程後，較好地解決瞭峽穀河道施工導流和總體佈置的榦擾問題。
위해결대석문수전참협곡하도공정포치곤난문제，채용료수정식일홍도설홍，병재수정저부설소력정진행일급소능，이간화동외소능공。공정포치채용가대일홍도수정직경，병이돌연확대단면적형식여진수나팔구말단련접，이용통기관향돌확단면대량보기，사수체여정벽지간형성기막，수류이탈리정벽적방식하설，증가참기，감경공식파배；장하유설홍동적성문동형단면향상유선전90o，형성단면형식위성문동형소력정，저충단면형식불동우전통적원형소력정，불부간화료시공，이차유리우수류확산，유효제고료소능효솔。경모형시험험증，저충탈벽류수정식일홍도형체설계급삼수부합설계요구，용우공정후，교호지해결료협곡하도시공도류화총체포치적간우문제。
A shaft spillway was used in the Dashimen Hydropower Station in order to deal with the layout of project due to the diversion in gorge. As primary energy dissipater,the water cushion pit was set on the bottom of the shaft,so the energy dissipater outside diversion tunnel was cut down. During the model test,a sudden enlargement section was set between the shaft inlet and the well casing,with the enlarged diameter,for via-ble air entrainment and prevention of cavitations erosion to shaft wall. In addition,the circular profile of water cushion pit was changed for horse-shoe section like the diversion tunnel. As the results,the change not only simplifies the construction,but also favorable for flow diffusion,increas-ing the energy dissipation efficiency. It is shown by the model test that the size and the type of the shaft are suited to the project. The inconsistency between construction diversion in gorge and the overall plan has been fairly solved.
