Abstract: A square pile construction method and equipment of a rotary drilling rig are disclosed. The square pile construction method includes: site leveling; surveying and setting out; creating concrete retaining wall of wellhead; putting the drilling rig in place; adjusting the verticality of the drilling rig; lead hole drilling; reamed hole drilling; square hole drilling; hole cleaning with round drill bit; and hole cleaning with square drill bit. The square pile construction method and rotary drilling rig can use equipment for square pile construction in the whole process. Three kinds of square pile drill bits and a square pile hole cleaning drill bit in cooperation with the square pile construction method, which further realizes the mechanization of the whole process of square pile construction, are disclosed.

Abstract: The disclosure belongs to the technical field of engineering construction, and particularly relates to a square pile construction method and equipment of a rotary drilling rig. The specific technical solution concerns a square pile construction method of a rotary drilling rig which includes: site leveling; surveying and setting out; creating concrete retaining wall of wellhead; putting the drilling rig in place; adjusting the verticality of the drilling rig; lead hole drilling; reamed hole drilling; square hole drilling; hole cleaning with round drill bit; and hole cleaning with square drill bit. The square pile construction method and rotary drilling rig can use equipment for square pile construction in the whole process, effectively reduce the underground operation of laborers, and avoid the project safety production risk from the source.

Abstract: Disclosed is a hepatoprotective traditional Chinese medicine composition, extract and pharmaceutical use thereof. The composition comprises Morinda officinalis How, Ganoderma lucidum (Leyss. Ex Fr.) Karst., Astragalus membranaceus (Fisch) Bge. Var. monghlicus (Bge) Hsiao, Ranunculus ternatus Thunb., Sophora flavescens Alt. and Salvia miltiorrhiza Bge. The composition and extract thereof may be used for treating liver injury, hepatitis, hepatic fibrosis, hepatic cirrhosis or liver cancer, and they may also be used as a vaccine adjuvant or an immunomodulator.

Abstract: A locomotive regenerative electric energy feedback system with an ice melting function, comprising two regenerative electric energy feedback devices (1). A direct-current side positive electrode of the regenerative electric energy feedback device (1) is connected to a positive electrode bus of a subway traction network, wherein the positive electrode bus is connected to an uplink contact network and a downlink contact network respectively via a first switching switch (4) and a second switching switch (5). A direct-current side negative electrode of the regenerative electric energy feedback device (1) is connected to the downlink contact network or the uplink contact network via a third switching switch (2), and the direct-current side negative electrode is connected to a negative electrode bus of the subway traction network via a fourth switching switch (3). Further disclosed is a control method corresponding to the system.

Abstract: A locomotive regenerative electric energy feedback system with an ice melting function, comprising two regenerative electric energy feedback devices (1). A direct-current side positive electrode of the regenerative electric energy feedback device (1) is connected to a positive electrode bus of a subway traction network, wherein the positive electrode bus is connected to an uplink contact network and a downlink contact network respectively via a first switching switch (4) and a second switching switch (5). A direct-current side negative electrode of the regenerative electric energy feedback device (1) is connected to the downlink contact network or the uplink contact network via a third switching switch (2), and the direct-current side negative electrode is connected to a negative electrode bus of the subway traction network via a fourth switching switch (3). Further disclosed is a control method corresponding to the system.