Japanese research institutions include Tokyo University, Kyoto University, Seikei University, Dong Bang Chemical Industry and its Research Institute, and Japan Chemical Industry (Company). In addition, there are dozens of professional grouting companies in Japan, among which Japan Comprehensive Waterproofing Co., Ltd. enjoys a high reputation in contracting grouting projects in Southeast Asia and Hong Kong. The units engaged in grouting research in the United States include Northwest University, Stanford University and melamine company. The Federal Highway Administration of the United States has conducted two studies, one is to study the present situation and technology of grouting, and the other is to evaluate the existing chemical grouting materials. British grouting research company was established in 19 19. At present, there are six large grouting engineering companies in Britain that contract grouting projects at home and abroad. Germany is engaged in grouting research together with Berlin University, Karlsruhe University, Munich University, Nuremberg Institute of Basic Studies and Essen Mining Research Center. In addition, A.A. Scow Censky Mining Research Institute of the former Soviet Union and Soretansius Grouting Company of France are all world-famous grouting technology research institutions or construction units. At present, domestic institutions engaged in research and engineering application of grouting technology mainly include Water Conservancy and Electric Power Research Institute, Coal Research Institute, Changsha Mining Research Institute, Guangzhou Chemical Grouting Engineering Company of Chinese Academy of Sciences, Railway Research Institute, Tsinghua University, China University of Mining and Technology, Northeastern University, Tongji University, Central South University of Technology, China Railway Southwest Research Institute, China Railway Tunnel Group Research Institute and Beijing Ruiwei Geotechnical Engineering Technology Co., Ltd..