Steel box girder incremental launching construction inhaul cable end head structure and construction method

Abstract

The application relates to a steel box girder pushing construction cable end structure and a construction method. The steel box girder pushing construction cable end structure comprises a U-shaped steel frame, the upper end of the U-shaped steel frame is welded with the bottom plate of the steel box girder, the U-shaped steel frame comprises a plurality of U-shaped steel plates which are arranged at intervals from bottom to top, U-shaped steel plate partition plates are arranged between the adjacent two U-shaped steel plates, a channel is formed between the outer sides of the adjacent two U-shaped steel plates, and steel strands with two ends respectively subjected to force applied by jacks are wound on the channel. The steel box girder pushing construction cable end structure is simple in structure, can guarantee the structural stress safety of the original bridge, and is convenient for construction.

Description

Technical Field

[0001] The invention relates to a cable end structure for jacking construction of a steel box girder and a construction method. Background Art

[0002] Steel box girders have been widely used in China due to their advantages such as light weight, high strength, convenient construction, and novel structure. They are especially used in the construction of bridges across deep valleys, rivers, roads, and railways. There are many methods for erecting steel box girder bridges, and the jacking method is one of the commonly used methods in engineering. Moreover, with the advancement of construction equipment, the efficiency and precision of the jacking method have made a qualitative leap, and gradually formed methods such as drag-type multi-point continuous jacking, wedge-type multi-point continuous jacking, and walking-type multi-point continuous jacking. Among them, the walking-type jacking method has the highest efficiency, precision, and safety, but also the highest cost; the drag-type jacking method has lower efficiency but good economy; the wedge-type jacking method has an efficiency and cost in between. With the continuous increase in the scale of steel box girder bridge erection using the jacking method, how to simplify the cable end structure during jacking construction has become increasingly important. Solving this problem can also make jacking construction more convenient. Summary of the Invention

[0003] The purpose of the present invention is to provide a cable end structure and construction method for steel box girder jacking construction. The cable end structure for steel box girder jacking construction has a simple structure, ensures the structural stress safety of the original bridge, and is convenient for construction.

[0004] The technical solution of the present invention is: a cable end structure for jacking construction of a steel box girder, comprising a U-shaped steel frame, the upper end of the U-shaped steel frame being welded to the bottom plate of the steel box girder, the U-shaped steel frame comprising a plurality of U-shaped steel plates spaced apart from bottom to top, a U-shaped steel plate partition being provided between adjacent two U-shaped steel plates, a groove being formed between the outer side surfaces of the adjacent two U-shaped steel plates, and a steel strand being wound around the groove with force applied by jacks at both ends.

[0005] Furthermore, both ends of the U-shaped steel plate partition extend a certain distance toward the arc opening side of the U-shaped steel frame.

[0006] Furthermore, both ends of the U-shaped steel plate partition extend 2 to 3 cm toward the arc opening side of the U-shaped steel frame.

[0007] Furthermore, the channel is U-shaped, and rubber pads are laid in the channel, and the steel strands act on the rubber pads.

[0008] Furthermore, four U-shaped steel plates are spaced apart from each other from top to bottom, and a U-shaped steel plate partition is welded between two adjacent U-shaped steel plates to form three grooves between the U-shaped steel frames, and each groove is filled with rubber pads and wound with steel strands.

[0009] Furthermore, stiffening steel plates are provided on the concave side of the U-shaped steel frame at equal angles along the arc direction, and the stiffening steel plates are vertically connected to the bottom plate of the steel box beam.

[0010] Furthermore, the reinforcing steel plates are welded to the U-shaped steel frame, and the angle between two adjacent reinforcing steel plates is 30°.

[0011] Furthermore, the thickness of the reinforcing steel plate is about 1-2 cm.

[0012] A steel box girder jacking construction method includes a steel box girder jacking construction cable end structure, and the steps are as follows:

[0013] Step 1: Bend the steel plate with the horizontal length of the steel strands at both ends of the jack contraction as the bending diameter. Connect the bent U-shaped steel plate to the positioning point at the bottom of the steel box girder by welding, and then weld the reinforcing steel plate to the concave side of the U-shaped steel plate;

[0014] Step 2: Bend the steel plate partition into the same arc and weld it to the U-shaped steel plate, and weld several U-shaped steel plates and the bent U-shaped steel plate partitions at equal intervals from top to bottom to separate the steel strand grooves;

[0015] Step 3: Install the rubber pads in the reserved grooves, and then lay the steel strands on the grooves. Use jacks to tension the steel strands, and gradually apply force. Apply tensioning force at both ends of a steel strand at the same time, causing the steel box girder to move in the direction of the force.

[0016] Furthermore, the thickness of each reinforcing steel plate is 2 cm, and the welding is performed with the arc center line of the U-shaped steel plate as the axis; the reinforcing steel plates are welded at an angle of 30°, and there are 3 reinforcing steel plates in total.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The cable end structure of the steel box girder jacking construction is simple and reasonably designed, which ensures the structural stress safety of the original bridge, is convenient to construct, and has good mechanical properties and economic benefits. It eliminates the steps of anchoring and cutting steel strands, and is more economical in construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view schematic diagram of the cable end structure for the jacking construction of a steel box girder according to the present invention;

[0020] Figure 2 For the present invention Figure 1 lateral view of;

[0021] Figure 3 For the present invention Figure 1 Bottom view of the .

[0022] In the figure: 1-steel box girder bottom plate, 2-U-shaped steel plate, 3-steel strand, 4-rubber pad, 5-stiffening steel plate, 6-U-shaped steel plate partition, 7-channel. DETAILED DESCRIPTION

[0023] To make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0024] refer to Figures 1 to 3

[0025] A cable end structure for jacking construction of a steel box girder comprises a U-shaped steel frame, the upper end of which is welded to the bottom plate 1 of the steel box girder. The U-shaped steel frame comprises a plurality of U-shaped steel plates 2 spaced apart from each other from bottom to top, with a U-shaped steel plate partition 6 provided between adjacent U-shaped steel plates. A channel 7 is formed between the outer sides of the adjacent U-shaped steel plates, and the channels are arranged equidistantly along the height direction of the U-shaped steel frame. Steel strands 3 are wound around the channels, each with a jack applying force to each end, so that force can be applied simultaneously at both ends. Force can be applied simultaneously by multiple steel strands, and the distance between the two points at the end of the U-shaped steel frame's arc matches the size of the tensioning jack's oil pump.

[0026] In this embodiment, the width of the main body of the U-shaped steel frame is about 15 cm, and both ends of the U-shaped steel plate partition extend 2 to 3 cm toward the arc side of the U-shaped steel frame; the height of the U-shaped steel plate frame is about 21 cm.

[0027] In this embodiment, the groove is U-shaped and is padded with rubber pads 4. The steel strands act on the rubber pads so that the position of the steel strands will not move when subjected to force, thereby reducing friction between the steel strands and the groove.

[0028] In this embodiment, four U-shaped steel plates are spaced apart from each other from top to bottom. A U-shaped steel plate partition is welded between each adjacent U-shaped plate to form three channels between the U-shaped steel frames. This divides the U-shaped steel frame into four layers, each with a similar structure. Each channel is filled with rubber pads and wound with steel strands.

[0029] In this embodiment, in order to achieve the bearing capacity required for pulling the steel strands, stiffening steel plates 5 are provided at equal angles along the arc direction on the concave side of the U-shaped steel frame. The thickness of the stiffening steel plates is about 1 to 2 cm, and the stiffening steel plates are vertically connected to the bottom plate of the steel box beam.

[0030] In this embodiment, the reinforcing steel plates are welded to the U-shaped steel frame, and the angle between two adjacent reinforcing steel plates is 30 degrees. Figure 3 shown.

[0031] A steel box girder jacking construction method includes a steel box girder jacking construction cable end structure, and the steps are as follows:

[0032] Step 1: Bend the steel plate with the horizontal length of the steel strands at both ends of the jack contraction as the bending diameter. The bent U-shaped steel plate is connected to the positioning point at the bottom of the steel box beam by welding, and then weld the stiffening steel plate on the concave side of the U-shaped steel plate; the thickness of each stiffening steel plate is 2cm, and the welding is carried out with the arc center line of the U-shaped steel plate as the axis; the stiffening steel plates are welded at an angle of 30 degrees, and there are 3 stiffening steel plates in total, as shown in the figure. Figure 3 The positions are welded in sequence.

[0033] Step 2: Bend the steel plate partition into the same arc and weld it to the U-shaped steel plate, and weld several U-shaped steel plates and the bent U-shaped steel plate partitions at equal intervals from top to bottom to separate the grooves of the steel strands.

[0034] Step 3: Install the rubber pads in the reserved grooves, and then lay the steel strands on the grooves. Use jacks to tension the steel strands, and gradually apply force. Apply tensioning force at both ends of a steel strand at the same time, causing the steel box girder to move in the direction of the force.

[0035] The above is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, it does not require creative labor to design different forms of steel box girder jacking construction cable end structure and construction method. Without departing from the principles and spirit of the present invention, all equal changes, modifications, substitutions and variations made within the scope of the patent application of the present invention should be covered by the scope of the present invention.

Claims

1. A cable end structure for jacking construction of a steel box girder, comprising a U-shaped steel frame, characterized in that: The upper end of the U-shaped steel frame is welded to the bottom plate of the steel box girder. The U-shaped steel frame includes a plurality of U-shaped steel plates spaced apart from each other from bottom to top. A U-shaped steel plate partition is provided between two adjacent U-shaped steel plates. A groove is formed between the outer side surfaces of the two adjacent U-shaped steel plates. Steel strands with forces applied by jacks at both ends are wound around the groove. Both ends of the U-shaped steel plate partition extend a certain distance toward the arc mouth side of the U-shaped steel frame.

2. The cable end structure for jacking construction of a steel box girder according to claim 1 is characterized in that: Both ends of the U-shaped steel plate partition extend 2 to 3 cm toward the arc opening side of the U-shaped steel frame.

3. A cable end structure for jacking construction of a steel box girder according to claim 1 or 2, characterized in that: The groove is U-shaped, and a rubber pad is paved in the groove, and the steel strand acts on the rubber pad.

4. A cable end structure for jacking construction of a steel box girder according to claim 1 or 2, characterized in that: Four U-shaped steel plates are spaced apart from each other from top to bottom, and a U-shaped steel plate partition is welded between two adjacent U-shaped steel plates to form three grooves between the U-shaped steel frames. Each groove is filled with rubber pads and wound with steel strands.

5. The cable end structure for jacking construction of a steel box girder according to claim 3 is characterized in that: The concave side of the U-shaped steel frame is provided with stiffening steel plates at equal angles along the arc direction, and the stiffening steel plates are vertically connected to the bottom plate of the steel box beam.

6. The cable end structure for jacking construction of a steel box girder according to claim 5, characterized in that: The reinforcing steel plates are welded to the U-shaped steel frame, and the angle between two adjacent reinforcing steel plates is 30 degrees.

7. A cable end structure for jacking construction of a steel box girder according to claim 5 or 6, characterized in that: The thickness of the reinforcing steel plate is 1-2 cm.

8. A steel box girder jacking construction method, comprising the steel box girder jacking construction cable end structure according to claim 5, characterized in that: Here are the steps: Step 1: Bend the steel plate with the horizontal length of the steel strands at both ends of the jack contraction as the bending diameter. Connect the bent U-shaped steel plate to the positioning point at the bottom of the steel box girder by welding, and then weld the reinforcing steel plate to the concave side of the U-shaped steel plate; Step 2: Bend the steel plate partition into the same arc and weld it to the U-shaped steel plate, and weld several U-shaped steel plates and the bent U-shaped steel plate partitions at equal intervals from top to bottom to separate the steel strand grooves; Step 3: Install the rubber pads in the reserved grooves, and then lay the steel strands on the grooves. Use jacks to tension the steel strands, and gradually apply force. Apply tensioning force at both ends of a steel strand at the same time, causing the steel box girder to move in the direction of the force.

9. A steel box girder jacking construction method according to claim 8, characterized in that: The thickness of each reinforcing steel plate is 2 cm, and the welding is performed with the arc center line of the U-shaped steel plate as the axis; the reinforcing steel plates are welded at an angle of 30°, and there are 3 reinforcing steel plates in total.

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