Unlock instant, AI-driven research and patent intelligence for your innovation.

Unbonded prestress of box girder or T-shaped girder, and steel-concrete combined reinforcement structure and construction method

A prestressed, non-bonded technology, used in bridge reinforcement, bridges, bridge construction, etc., can solve the problems of inconvenient maintenance, easy failure of newly added prestressing, heavy reinforcement structure, etc. Capacity and structural stiffness, the effect of eliminating stress concentration

Inactive Publication Date: 2015-03-25
XIAN HIGHWAY INST +1
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the purposes of the present invention is to provide a non-bonded prestressed reinforcement structure of box girder or T beam, to solve the existing box girder prestressed reinforcement method that has a thick reinforcement structure, inconvenient maintenance and easy failure of newly added prestressed The problem

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Unbonded prestress of box girder or T-shaped girder, and steel-concrete combined reinforcement structure and construction method
  • Unbonded prestress of box girder or T-shaped girder, and steel-concrete combined reinforcement structure and construction method
  • Unbonded prestress of box girder or T-shaped girder, and steel-concrete combined reinforcement structure and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The bridge to be reinforced in this embodiment is Fangjiacun Interchange of Xi'an Ring Expressway.

[0086] The starting point of the main line bridge is K-1+492.96, the ending point is K0+351.04, and the total length of the bridge is 858.08 meters.

[0087] Two-way six-lane, bridge deck width 35m, spanning Lianhuo Expressway, crossing angle 90°.

[0088] The Fangjia Village Interchange Main Line Bridge has 37 spans on the left and 37 spans on the right.

[0089] The superstructure is reinforced concrete single-box multi-chamber continuous box girder, and the substructure is pile foundation, pre-buried abutment and column piers.

[0090] The width of the bridge deck is 0.5m (guardrail) + 15.5-22.78m (travelway) + 3.0m (central divider) + 15.5-24.07m (travelway) + 0.5m (guardrail).

[0091] The design load of the bridge is 20 for cars and 120 for trailers.

[0092] The defects of the Fangjiacun overpass are mainly manifested in the excessive stress of the box girder r...

Embodiment 2

[0100] The bridge to be reinforced in this embodiment is a certain bridge in Hanzhong, which was built in the 1960s. The upper structure of the bridge is a 5-span 14.1-meter reinforced concrete T-beam, and the lower structure is gravity piers and abutments.

[0101] Bridge deck width: 0.32m (railing) + 6.55m (travelway) + 0.32m (railing).

[0102] Bridge deck pavement: cement concrete + asphalt concrete

[0103] Estimated design load: steam-class 13, trailer-60 (according to the 1956 "Highway Engineering Design Guidelines (Revised Draft)" standard).

[0104] The design load of the bridge was low when it was built. In recent years, with the increasing traffic volume of the bridge and the increase of the proportion of heavy vehicles, the bearing capacity of the bridge can no longer meet the requirements of the current regulations and current traffic capacity. Great security risk. According to the bridge's "Bridge Bearing Capacity Inspection and Evaluation Report", the bridge'...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an unbonded prestress and steel plate-concrete combined reinforcement structure for a box girder or a T-shaped girder. The disclosed reinforcement structure comprises a bottom steel plate, steel plates in the longitudinal bridge direction and plug steel plates in the transverse bridge direction, wherein the bottom steel plate, the steel plates in the longitudinal bridge direction and the plug steel plates in the transverse bridge direction encircle a to-be-reinforced part of a bridge to form a cavity; a plurality of prestressed tendons penetrate through the cavity, concrete is poured into the cavity, and the thickness of the concrete is 10-15 cm; the stretch-draw ends of each prestressed tendon are fixed on the plug steel plates in the transverse bridge direction. The steps in the construction of the reinforcement structure are as follows: firstly, confirming the to-be-reinforced part; secondly, cleaning the surface and anchor bolts of the to-be-reinforced part; thirdly, mounting reinforcement components on the to-be-reinforced part, and encircling the to-be-reinforced part to form a cavity; pouring concrete into the cavity; finally, stretch-drawing and fixing the prestressed tendons after the concrete reaches the designed strength. The reinforcement structure provided by the invention has the characteristics of tidiness in appearance, high stability and convenience for construction.

Description

technical field [0001] The invention relates to a bridge reinforcement technology, in particular to a combined reinforcement structure of a box girder or a T beam with unbonded prestress and steel plate-concrete and a construction method thereof. Background technique [0002] For some bridges with complex structures (sufficient structural bearing capacity reserves) or long-span bridges, the stress state of special parts of the structure needs to be controlled. Stress reinforcement, the common prestressed reinforcement method is the external prestressed concrete reinforcement method. In this method, ribbed steel bars are implanted on the side or bottom of the beam, steel mesh is tied on the planted bars, prestressed steel bars are positioned, and concrete (or anchor blocks and steering blocks) are poured. block), after the design strength is reached, the prestressed tendons are stretched, and the arrangement of the prestressed beams is linear or broken. [0003] Although the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E01D22/00
Inventor 石雄伟郭力袁卓亚许冰柯亮亮冯威马毓泉雷丹龚晓晖赵衍鸿
Owner XIAN HIGHWAY INST