Construction method of steel-concrete combined skewback structure and construction method thereof

Abstract

The present disclosure belongs to the technical field of arch bridge structures, and particularly relates to a steel-concrete combined skewback structure and a construction method thereof. In the present disclosure, by arranging arch rib tubes, concrete sections in a main chord pipe, concrete blocks in a skewback, fixing steel tubes, a transverse diaphragm unit, and a vertical diaphragm unit, the steel-concrete combined skewback structure can achieve the following objectives that 1. the skewback structure can be fully connected with a bearing platform; and 2. the fixing steel tubes are fully filled with concrete. In addition, the present disclosure further provides the construction method of the above steel-concrete combined skewback structure. The construction method the skewback structure itself and its mounting manner both have sufficient structural stability.

What is claimed is: 
     
         1 . A steel-concrete combined skewback structure, comprising arch rib tubes ( 11 ), concrete sections ( 12 ) in a main chord pipe, and concrete blocks ( 13 ) in a skewback, and further comprising a steel structure box unit ( 1 ) internally provided with the concrete blocks ( 13 ) in the skewback and used for allowing the arc rib tubes ( 11 ) to be inserted therein, fixing steel tubes ( 2 ) inserted into the steel structure box unit ( 1 ) and used for connecting a bearing platform (a), a transverse diaphragm unit ( 3 ) arranged in the steel structure box unit ( 1 ) and used for sleeving the fixing steel tubes ( 2 ), and a vertical diaphragm unit ( 4 ) arranged on the transverse diaphragm unit ( 3 ) and used for filling the fixing steel tubes ( 2 ) with concrete by sleeving the arch rib tubes ( 11 ). 
     
     
         2 . The steel-concrete combined skewback structure according to  claim 1 , wherein the steel structure box unit ( 1 ) comprises a bottom plate ( 101 ), lower vertical plates ( 102 ), lower inclined plates ( 103 ), upper vertical plates ( 104 ), upper inclined plates ( 105 ), a top plate ( 106 ), and two sealed webs ( 107 ) arranged on the bottom plate ( 101 ), wherein the lower vertical plates, the lower inclined plates, the upper vertical plates, the upper inclined plates, and the top plate are sequentially arranged on the bottom plate ( 101 ) from bottom to top. 
     
     
         3 . The steel-concrete combined skewback structure according to  claim 2 , wherein the steel structure box unit ( 1 ) further comprises fixing holes ( 108 ) formed in the bottom plate ( 101 ) and used for allowing the fixing steel tubes ( 2 ) to be inserted therein, mounting holes ( 109 ) formed in the lower inclined plates ( 103 ) and used for allowing the arc rib tubes ( 11 ) to be inserted therein and adding concrete into the fixing steel tubes ( 2 ), and communicating holes ( 110 ) formed in the upper inclined plates ( 105 ) and used for pouring the concrete blocks ( 13 ) in the skewback. 
     
     
         4 . The steel-concrete combined skewback structure according to  claim 2 , wherein the steel structure box unit ( 1 ) further comprises a pouring hole ( 111 ) formed in the top plate ( 106 ). 
     
     
         5 . The steel-concrete combined skewback structure according to  claim 2 , wherein the transverse diaphragm unit ( 3 ) comprises a lower cross plate ( 301 ) arranged on the two lower vertical plates ( 102 ), an upper cross plate ( 302 ) arranged on the two upper vertical plates ( 104 ), reinforcing holes ( 303 ) formed in the lower cross plate ( 301 ) and used for allowing the fixing steel tubes ( 2 ) to be inserted therein, and concrete falling holes ( 304 ) formed in the lower cross plate ( 301 ) and the upper cross plate ( 302 ). 
     
     
         6 . The steel-concrete combined skewback structure according to  claim 5 , wherein the vertical diaphragm unit ( 4 ) comprises lower vertical plates ( 401 ) arranged on the bottom plate ( 101 ) and the lower cross plate ( 301 ), middle vertical plates ( 402 ) arranged on the lower cross plate ( 301 ) and the upper cross plate ( 302 ), and upper vertical plates ( 403 ) arranged on the upper cross plate ( 302 ) and the top plate ( 106 ). 
     
     
         7 . The steel-concrete combined skewback structure according to  claim 6 , wherein the vertical diaphragm unit ( 4 ) further comprises positioning vertical plates ( 404 ) arranged on an upper surface of the lower cross plate ( 301 ) and used for blocking insertion ends of the arch rib tubes ( 11 ), and vertical hole plates for limiting ( 405 ) arranged on the upper surface of the lower cross plate ( 301 ) and used for sleeving the arch rib tubes ( 11 ). 
     
     
         8 . The steel-concrete combined skewback structure according to  claim 7 , wherein stiffening ribs ( 5 ) are respectively arranged on the lower cross plate ( 301 ), the upper cross plate ( 302 ), the lower vertical plates ( 401 ), the middle vertical plates ( 402 ), the upper vertical plates ( 403 ), the positioning vertical plates ( 404 ), and the vertical hole plates for limiting ( 405 ). 
     
     
         9 . A construction method of the steel-concrete combined skewback structure according to  claim 1 , sequentially comprising the following steps:
 S1, positioning fixing steel tubes, wherein the fixing steel tubes ( 2 ) are vertically inserted before a bearing platform (a) is cured, at least ⅓ of lengths of the fixing steel tubes ( 2 ) are exposed, and then vertical angles of the fixing steel tubes ( 2 ) are reinforced in an assisted manner till the bearing platform (a) is cured;   S2, positioning a steel structure box unit, wherein the fixing steel tubes ( 2 ) are sleeved with the steel structure box unit ( 1 ) till the steel structure box body ( 1 ) is pressed on an upper surface of the bearing platform (a);   S3, mounting arch rib tubes, wherein the arch rib tubes ( 11 ) are mounted and fixed on the steel structure box unit ( 1 );   S4, pouring concrete, wherein the concrete is added into the arch rib tubes ( 11 ), so that the fixing steel tubes ( 2 ), the steel structure box unit ( 1 ) and the arch rib tubes ( 11 ) are sequentially filled with the concrete; and   S5, performing concrete vibration and compaction curing, wherein the concrete is firstly subjected to vibration and compaction in the arc rib tubes ( 11 ) and/or the steel structure box unit ( 1 ), and then curing is performed, so as to finally obtain the steel-concrete combined skewback structure.   
     
     
         10 . The construction method of the steel-concrete combined skewback structure according to  claim 9 , wherein in S4 of pouring concrete, the concrete is also added to the steel structure box unit ( 1 ).