Patent Number: 
Section: claims

1. A method for hoisting and transporting assemblies in an underground nuclear power plant, the method comprising:1) pouring concrete onto a reactor cavern to form a rock anchor beam disposed on an upper part of the reactor cavern; excavating a hoist shaft on a top portion of a reactor cavern in a direction perpendicular to the ground; hoisting a circular bridge crane to the reactor cavern through the hoist shaft; and mounting the circular bridge crane on the rock anchor beam;2) installing a containment cylinder in the reactor cavern and installing a track beam of a polar crane on an upper part of the containment cylinder using the circular bridge crane; hoisting one end of a polar crane girder and sending the polar crane girder through the hoist shaft to the reactor cavern; hoisting the other end of the polar crane girder to be horizontal by the circular bridge crane; and mounting the polar crane girder on the track beam;3) hoisting processed pieces of a steel lining to the reactor cavern through the hoist shaft; by using the track beam and the polar crane girder as supporting points, soldering and assembling the pieces of the steel lining on a top portion of the containment cylinder to form a containment dome;4) transporting permanent equipment for a nuclear reactor into the containment cylinder through a transport corridor which is connected to the reactor cavern; and turning over the permanent equipment and hoisting the permanent equipment to working areas using the polar crane girder. 2. The method of claim 1, wherein when performing 1), excavating combined caverns; mounting bridge cranes on upper parts of the combined caverns, respectively; transporting nuclear power auxiliary devices through a primary traffic tunnel to installation platforms which are respectively disposed at one side or one end of the combined caverns; and hoisting the nuclear power auxiliary devices to working positions by the bridge cranes. 3. The method of claim 1, wherein when performing 2), excavating combined caverns; mounting bridge cranes on upper parts of the combined caverns, respectively; transporting nuclear power auxiliary devices through a primary traffic tunnel to installation platforms which are respectively disposed at one side or one end of the combined caverns; and hoisting the nuclear power auxiliary devices to working positions by the bridge cranes. 4. The method of claim 1, wherein when performing 3), excavating combined caverns; mounting bridge cranes on upper parts of the combined caverns, respectively; transporting nuclear power auxiliary devices through a primary traffic tunnel to installation platforms which are respectively disposed at one side or one end of the combined caverns; and hoisting the nuclear power auxiliary devices to working positions by the bridge cranes. 5. The method of claim 1, wherein when performing 4), excavating combined caverns; mounting bridge cranes on upper parts of the combined caverns, respectively; transporting nuclear power auxiliary devices through a primary traffic tunnel to installation platforms which are respectively disposed at one side or one end of the combined caverns; and hoisting the nuclear power auxiliary devices to working positions by the bridge cranes. 6. The method of claim 1, wherein when performing 1), 2), 3), and 4), excavating combined caverns; mounting bridge cranes on upper parts of the combined caverns, respectively; transporting nuclear power auxiliary devices through a primary traffic tunnel to installation platforms which are respectively disposed at one side or one end of the combined caverns; and hoisting the nuclear power auxiliary devices to working positions by the bridge cranes. 7. The method of claim 1, further comprising: 5) excavating combined caverns, mounting bridge cranes on upper parts of the combined caverns, respectively; transporting nuclear power auxiliary devices through a primary traffic tunnel to installation platforms which are respectively disposed at one side or one end of the combined caverns; and hoisting the nuclear power auxiliary devices to working positions by the bridge cranes. 8. The method of claim 2, wherein the combined caverns comprise an auxiliary powerhouse cavern, two safe powerhouse caverns comprising a first powerhouse cavern and a second powerhouse cavern, and a nuclear fuel powerhouse cavern; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern are disposed lengthwise in a line; the auxiliary powerhouse cavern, the first safe powerhouse cavern, the nuclear fuel powerhouse cavern and the first second safe powerhouse cavern are connected in sequence; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern each are connected to the primary traffic tunnel. 9. The method of claim 3, wherein the combined caverns comprise an auxiliary powerhouse cavern, two safe powerhouse caverns comprising a first powerhouse cavern and a second powerhouse cavern, and a nuclear fuel powerhouse cavern; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern are disposed lengthwise in a line; the auxiliary powerhouse cavern, the first safe powerhouse cavern, the nuclear fuel powerhouse cavern and the second safe powerhouse cavern are connected in sequence; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern each are connected to the primary traffic tunnel. 10. The method of claim 4, wherein the combined caverns comprise an auxiliary powerhouse cavern, two safe powerhouse caverns comprising a first powerhouse cavern and a second powerhouse cavern, and a nuclear fuel powerhouse cavern; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern are disposed lengthwise in a line; the auxiliary powerhouse cavern, the first safe powerhouse cavern, the nuclear fuel powerhouse cavern and the second safe powerhouse cavern are connected in sequence; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern each are connected to the primary traffic tunnel. 11. The method of claim 5, wherein the combined caverns comprise an auxiliary powerhouse cavern, two safe powerhouse caverns comprising a first powerhouse cavern and a second powerhouse cavern, and a nuclear fuel powerhouse cavern; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern are disposed lengthwise in a line; the auxiliary powerhouse cavern, the first safe powerhouse cavern, the nuclear fuel powerhouse cavern and the second safe powerhouse cavern are connected in sequence; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern each are connected to the primary traffic tunnel. 12. The method of claim 6, wherein the combined caverns comprise an auxiliary powerhouse cavern, two safe powerhouse caverns comprising a first powerhouse cavern and a second powerhouse cavern, and a nuclear fuel powerhouse cavern; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern are disposed lengthwise in a line; the auxiliary powerhouse cavern, the first safe powerhouse cavern, the nuclear fuel powerhouse cavern and the second safe powerhouse cavern are connected in sequence; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern each are connected to the primary traffic tunnel. 13. The method of claim 7, wherein the combined caverns comprise an auxiliary powerhouse cavern, two safe powerhouse caverns comprising a first powerhouse cavern and a second powerhouse cavern, and a nuclear fuel powerhouse cavern; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern are disposed lengthwise in a line; the auxiliary powerhouse cavern, the first safe powerhouse cavern, the nuclear fuel powerhouse cavern and the second safe powerhouse cavern are connected in sequence; the auxiliary powerhouse cavern, the two safe powerhouse caverns, and the nuclear fuel powerhouse cavern each are connected to the primary traffic tunnel.