The invention relates to a gob-side entry retaining roadside support system and a construction method thereof. A rhombic steel bar net is arranged on one side of a gob, an air drum cloth is laid on the inner side of the rhombic steel bar net, light aggregate concrete is adopted to perform guniting treatment on the air drum cloth and the rhombic steel bar net, a windtight light aggregate concrete spray layer is formed on the side of the gob, the thickness of the light aggregate concrete spray layer is 200-500 mm, and the other side of the light aggregate concrete spray layer is close to a steel tube concrete pier stud supporting device. A steel tube concrete pier stud is formed by filling an empty steel tube with concrete; through a restraint effect of a steel tube casing, internal concrete is in a three-dimensional stressed state, the geometrical stability of the steel tube wall is enhanced, and the bearing capacity of the steel tube concrete pier stud is improved. According to the gob-side entry retaining roadside support system, a top plate can be supported in high strength, coal mining efficiency is effectively improved, and an operation environment in a roadway is improved; the steel tube concrete pier stud can be recycled through a special thrust device, and the roadway retained cost is reduced.

Gob-side entry retaining roadside support system and construction method thereof

The invention relates to the field of construction of a bridge steel concrete combination beam fastening pier and particularly relates to a mounting construction method of a steel concrete combination beam fastening pier. The mounting construction method of the steel concrete combination beam fastening pier is characterized by comprising the following steps: (I) producing and assembling a steel jacket box, a steel box beam and a pier column stirrup in a steel structure factory; (III) mounting pier column vertical main steel bars in the steel jacket box; (IV) hoisting the steel box beam; (V) mounting pier column vertical main steel bars in the steel box beam; (VI) pouring concrete in the steel jacket box 1; and (VI) pouring fastening pier column concrete. In the construction method, the processes such as steel cutting and processing are all subjected to standard construction in a processing plant, the construction quality can be guaranteed, the construction time can be saved, and potential safety hazards can be reduced.

Mounting construction method of steel concrete combination beam fastening pier

The invention relates to a beam node template technology. The technology comprises the steps of arranging concrete pillar steel pipes in beam node areas, wherein concrete is cast into the concrete columnar steel pipes, wherein at least 16 steel pipe through holes are formed in each concrete columnar steel pipe, the concrete columnar steel pipes are connected with reinforcing concrete beams, one cross-type steel plate is vertically inserted into each concrete columnar steel pipe in a penetrated mode, at least 8 steel plate through holes are formed in each cross-type steel plate in the corresponding beam node area, each reinforcing concrete beam is composed of at least four beam longitudinal bars, multiple beam stirrups, and concrete, the beam longitudinal bars traverse through the beam node area, and are welded to reinforcing concrete steel pipes and the cross-type steel plates after passing through the steel pipe through holes and the steel plate through holes in sequence. The beam node template technology is simple in structure and convenient in construction, and the bearing capacity and ductility of the beam node area are effectively improved.

Beam node template technology

The invention discloses a capping beam mounting method for mutual constraint of adjacent pier columns in a prefabricated bridge. The capping beam mounting method comprises steps of arranging a cappingbeam formwork according to a capping beam form, respectively and fixedly arranging limiting steel rings at two ends of a rectangular frame, and vertically arranging steel bar sleeves in the limitingsteel rings; in the installation process, hoisting a bent cap formwork at the tops of every two adjacent prefabricated pier columns, and inserting pier column embedded steel bars protruding out of tops of the two prefabricated pier columns into the steel bar sleeves at two ends of the bent cap formwork in a one-to-one correspondence mode; limiting the two adjacent prefabricated pier columns in thebent cap formwork; The method is advantaged in that construction efficiency of bent cap installation can be remarkably improved, and the engineering quality is guaranteed.

Capping beam mounting method for mutual constraint of adjacent pier columns in prefabricated bridge

The invention discloses a bridge structure system capable of being quickly modified. The bridge structure system comprises beam bodies, end beams, bearing tables and anti-collision walls. The bridge structure system is characterized by further comprising height-adjustable splicing type pier stud structures, self-levelling type supporting base structures, telescopic seam structures capable of beingquickly regulated, and linear adjustable guard bar and anti-collision wall structures, wherein the height-adjustable splicing type pier stud structures are arranged between the end covers and the bearing tables; the beam bodies are arranged on the cover beams through the self-levelling type supporting base structures; the telescopic seam structures capable of being quickly regulated are arrangedon the end parts of adjacent two beam bodies; and the linear adjustable guard bar and anti-collision wall structures are arranged on the end heads of the two anti-collision walls. The bridge structuresystem can accomplish bridge modifying construction within a short time; and the vertical curve line form and the clearance height of the original bridge are changed by a matched jacking process.

Bridge structure system capable of being quickly modified

The invention discloses a quick connection method for prefabricated steel pipe constraint type steel concrete pier columns and a cover beam. The method comprises the steps that when the steel concrete cover beam is prefabricated, reserved holes used for connecting the two elements are formed in the portions, corresponding to the pier columns, of the steel concrete cover beam; at the bottom interfaces of the steel pipe constraint type steel concrete pier columns and the cover beam, profile steel flange plates extend to the positions under stressed reinforcing steel bars arranged at the top of the cover beam, steel pipes at the peripheries of the pier columns do not extend, and steel bars connected with the cover beam need to be embedded in stand column sections at the top ends of the pier columns, wherein the anchorage length of the steel bars and the depth that the steel bars are embedded into the cover beam need to meet the related bridge design specification construction requirements; transverse steel bars are arranged in profile steel flange plate anchorage holes formed in the reserved holes of the cover beam in a penetrating mode and connected together with the steel bars arranged at the peripheries of the reserved holes of the cover beam, and concrete is poured in the reserved holes. According to the method, the problems that the construction occupation site is large, the construction period is long, part of connection work procedures are trouble, and welding is difficult are solved, the connection reliability and bearing capacity of this kind of bridge piers are guaranteed, and the resistance, the shock resistance and the rigidity of the bridge piers are improved.

Xiang Yiqiang

Papers

Quick connection method for prefabricated steel pipe constraint type steel concrete pier columns and cover beam