Bridge support pre-pressing structure

Abstract

The utility model provides a bridge support prepressing structure which comprises a pier bearing platform and a bridge support and is characterized by further comprising a counter-pulling structure, the bridge support comprises three pairs of stand columns, the middle portions of the stand columns are connected together through a transverse connecting rod and a longitudinal connecting rod, two stand columns in the same pair are supported below the two ends of a transverse distribution beam, and the two ends of the transverse distribution beam are connected with the counter-pulling structure. The transverse distribution beam is supported below the longitudinal distribution beam, and a jack supporting beam is arranged on the longitudinal distribution beam; the counter-pulling structure comprises a jack and a row of steel cables, the lower ends of the steel cables and the pier bearing platform are fixed together, the jack is arranged on the supporting beam, and the steel cables and the jack are fixed together. The bridge support pre-pressing device has the advantage of being capable of being used for pre-pressing a bridge support, and the problems that in the loading (unloading) process, when pre-pressing is conducted through a stacking pre-pressing method, hoisting safety risks of precast blocks are high, the period is long, and many limiting factors exist are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction technical field especially relates to a bridge support preloading structure. BACKGROUND

[0002] 0 block support preloading is the important work in continuous bridge construction, and the purpose is to eliminate the non-elastic deformation of the support and test the bearing capacity and stability of the whole support system. The traditional preloading method mainly has the stack preloading method, and the stack method has high lifting safety risk of precast block, long cycle and many limiting factors in the loading (unloading) process. Therefore, it is urgent to develop a construction technology which can guarantee the preloading quality and realize safe and efficient construction. UTILITY MODEL CONTENT

[0003] The utility model aims at providing a bridge support preloading structure for preloading the bridge support, which avoids the problems of high lifting safety risk of precast block, long cycle and many limiting factors in the loading (unloading) process by the stack preloading method.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technology: a bridge support preloading structure, which comprises a pier cap and a bridge support, characterized by further comprising a counter-pulling structure, the bridge support comprises three pairs of longitudinal distributed vertical columns supported on the cap, two vertical columns in the same pair of vertical columns are distributed along the transverse direction, the middle part of the same pair of vertical columns is connected together through a transverse connecting rod, the vertical columns in the adjacent two rows of vertical columns are connected together through a longitudinal connecting rod, two vertical columns in the same pair of vertical columns are supported below the two ends of a transverse distribution beam, all the transverse distribution beams are supported below a plurality of longitudinal distribution beams distributed along the transverse direction, a plurality of jack support beams distributed along the longitudinal direction are arranged on the longitudinal distribution beam, and the jack support beam extends along the transverse direction; the counter-pulling structure comprises a plurality of rows of steel cables distributed along the longitudinal direction and a plurality of jacks, the lower end of the steel cable is fixed together with the pier cap, the number of the jack support beams is equal to the number of the rows of steel cables, one jack support beam is aligned with one row of steel cables, a plurality of jacks distributed along the transverse direction are arranged on the jack support beam, the jacks are aligned one by one with the steel cables, and the upper end of the steel cable is fixed one by one with the jacks. When in use, the bridge support is preloaded by the counteracting force generated by the jacks lifting and pulling the steel wires, so as to detect the deformation of the bridge support under stress.

[0005] Preferably, the jacks are hollow jacks. It is convenient to fix the steel cables.

[0006] As preferred, the jack support beam is spliced by two I-beams, and a plurality of steel connecting plates are welded between the two I-beams and distributed in the transverse direction, the steel connecting plates fix the two I-beams together, the two I-beams are spaced apart to form a lower gap for the steel cable to pass through, and the steel cable passes through the lower gap. Through a specific technical solution of the jack support beam, the connection of the jack and the steel cable can be conveniently carried out.

[0007] As preferred, the jack support beam is spliced by two I-beams, and the jack is supported on the I-beams by two metal support blocks, an upper gap is formed between the two metal support blocks, and the steel cable passes through the upper gap. The pressure bearing effect is good.

[0008] As preferred, the steel cable is poured together with the pier cap. The fixation is reliable.

[0009] As preferred, the steel cable is composed of at least three steel wires wound together, the lower end of the steel cable is connected together with a connecting anchor, the connecting anchor is poured into the pier cap, the connecting anchor includes an upper steel plate, a lower steel plate, and a connecting steel sleeve connecting the upper steel plate and the lower steel plate together, the lower end of the steel wire passes through the upper steel plate and is correspondingly arranged in the connecting steel sleeve, and the steel wire is fixed together with the connecting steel sleeve. The fixation reliability between the steel cable and the pier cap can be improved.

[0010] As preferred, the connecting steel sleeve is welded together with the upper steel plate and the lower steel plate. The fixation is convenient.

[0011] As preferred, when the connecting steel sleeve is welded together with the upper steel plate, an upper welding ring is formed, an upper chamfered surface is arranged on the upper end of the outer circumferential surface of the connecting steel sleeve, an upper annular groove is surrounded between the upper chamfered surface and the upper steel plate, and the upper welding ring is filled in the upper annular groove; when the connecting steel sleeve is welded together with the lower steel plate, a lower welding ring is formed, a lower chamfered surface is arranged on the lower end of the outer circumferential surface of the connecting steel sleeve, a lower annular groove is surrounded between the lower chamfered surface and the lower steel plate, and the lower welding ring is filled in the lower annular groove. The connection is reliable.

[0012] As preferred, the upper surface of the lower steel plate is provided with a connecting pit in one-to-one correspondence with the inner space of the connecting steel sleeve, and the lower end of the steel wire is welded in the connecting pit. The reliability of the cable fixation can be improved.

[0013] As preferred, a plurality of rows of threaded holes are arranged on the connecting steel sleeve and distributed in the axial direction of the connecting steel pipe, the threaded holes in the same row are distributed in the up-down direction, and a jack screw is threadedly connected in the threaded hole and used to clamp the steel wire in the connecting steel sleeve. The fixation is reliable and the fixation force can be adjusted.

[0014] As preferred, the threaded holes are even rows, and the threaded holes are uniformly distributed along the circumference of the connecting steel sleeve.

[0015] As preferred, the threaded holes in any two adjacent rows are staggered in the up-down direction, which can improve the reliability of fixing the steel wire.

[0016] As preferred, the pier cap comprises a steel reinforcement cage and concrete poured on the steel reinforcement cage, and the connecting anchor is welded with the steel reinforcement cage, which can improve the connection reliability of the steel cable.

[0017] As preferred, the steel reinforcement cage comprises a plurality of horizontal steel bars and a plurality of vertical steel bars, the upper steel plate is welded below the plurality of horizontal steel bars, and the lower steel plate is welded above the plurality of horizontal steel bars, which can improve the fixing reliability between the connecting anchor and the pier cap.

[0018] Beneficial effects: precise control of load, clear equivalent counter-pulling preloading load transmission path, high preloading efficiency and good effect;

[0019] Safety and reliability: the equivalent counter-pulling preloading process is adopted, which avoids the hoisting operation near the navigation channel, reduces the influence on navigation safety, effectively saves the construction space, and the deformation observation point of the support is easy to arrange, which further ensures the accuracy of the observation data; significant economic benefits. The traditional heavy load preloading period of sand bags or precast blocks is 12 days, while the preloading period by the utility model is about 4 days, compared with the traditional preloading method, the preloading period is shortened, and the assembled structure is easy to disassemble and recycle, which effectively controls the engineering cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a front view of the utility model;

[0021] Figure 2 is a front view of the utility model; Figure 1 is a local enlarged view of A of the utility model;

[0022] Figure 3 is a local enlarged view of B of the utility model; Figure 2

[0023] Figure 4 is a local enlarged view of C of the utility model; Figure 3

[0024] Figure 5 ​​The utility model discloses a top view schematic drawing. In the drawing: pier cap 1, stand 2, cross connecting rod 3, longitudinal connecting rod 4, cross distribution beam 5, longitudinal distribution beam 6, jack support beam 7, I-steel 8, steel connecting sheet 9, lower gap 10, jack 11, steel cable 12, metal support block 13, steel wire 14, upper steel plate 15, lower steel plate 16, connecting steel sleeve 17, upper welding ring 18, lower welding ring 19, lower chamfer surface 20, connecting pit 21, top wire 22, concrete 23, horizontal steel bar 24, vertical steel bar 25, connecting anchor 26, bridge support 27. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] Referring to Figures 1 to 5 A bridge support pre-pressing structure, comprising a pier cap 1, a bridge support 27 and a counter-pulling structure. The bridge support comprises three pairs of longitudinally distributed stands 2 supported on the cap, two stands in the same pair are distributed along the transverse direction, the middle part of the same pair of stands is connected together through a cross connecting rod 3, the stands in the adjacent two rows are connected together through longitudinal connecting rods 4, the two stands in the same pair are supported below the two ends of a cross distribution beam 5, all the cross distribution beams are supported below a plurality of longitudinal distribution beams 6 distributed along the transverse direction, the longitudinal distribution beams are provided with a plurality of jack support beams 7 distributed along the longitudinal direction, and the jack support beams extend along the transverse direction. The jack support beam is spliced by two I-steel 8, a plurality of steel connecting sheets 9 distributed along the transverse direction are welded between the two I-steel, the steel connecting sheets fix the two I-steel together, and the two I-steel are spaced apart to form a lower gap 10 for the steel cable to pass through.

[0027] The counter-pulling structure comprises a plurality of rows of steel cables 12 and jacks 11. The lower end of the steel cable is fixed together with the pier cap, and the jacks are equal in number to the rows of steel cables. One jack support beam is aligned with one row of steel cables, the jack support beam is provided with a plurality of jacks distributed along the transverse direction, the jacks are aligned one by one with the steel cables, and the upper end of the steel cable is fixed one by one with the jack. The jack is a hollow jack.

[0028] In use, the bridge support is pre-pressed by the counteracting force generated by the jacking of the steel wire through the jack, so as to detect the deformation of the bridge support under stress.

[0029] The jack is supported on the I-shaped steel by two metal supporting blocks 13, and the upper gap is formed between the two metal supporting blocks. The cable passes through the lower gap and the upper gap.

[0030] The cable is composed of at least three steel wires 14 wound together, and the lower end of the cable is connected with the connecting anchor 26. The connecting anchor is cast in the pier cap, and the connecting anchor comprises an upper steel plate 15, a lower steel plate 16, and a connecting steel sleeve 17 connecting the upper steel plate and the lower steel plate together. The lower end of the steel wire passes through the upper steel plate and is correspondingly arranged in the connecting steel sleeve, and the steel wire is fixed with the connecting steel sleeve. The connecting steel sleeve is welded with the upper steel plate and the lower steel plate. When the connecting steel sleeve is welded with the upper steel plate, an upper welding ring 18 is formed, and an upper chamfered surface is arranged on the outer circumferential surface of the connecting steel sleeve. The upper chamfered surface and the upper steel plate form an upper annular groove, and the upper welding ring is filled in the upper annular groove. When the connecting steel sleeve is welded with the lower steel plate, a lower welding ring 19 is formed, and a lower chamfered surface 20 is arranged on the lower end of the outer circumferential surface of the connecting steel sleeve. The lower chamfered surface and the lower steel plate form a lower annular groove, and the lower welding ring is filled in the lower annular groove. The upper surface of the lower steel plate is provided with a connecting pit 21 corresponding to the inner space of the connecting steel sleeve, and the lower end of the steel wire is welded in the connecting pit. The connecting steel sleeve is provided with a plurality of rows of threaded holes distributed along the axial direction of the connecting steel pipe. The threaded holes in the same row are distributed in the up-down direction, and the threaded holes are screwed with a jack 22 for clamping the steel wire in the connecting steel sleeve. The threaded holes are even in number and are uniformly distributed along the circumference of the connecting steel sleeve. The threaded holes in any two adjacent rows are staggered in the up-down direction. The pier cap comprises a steel reinforcement and concrete 23 cast on the steel reinforcement. The connecting anchor is welded with the steel reinforcement. Specifically, the steel reinforcement comprises a plurality of horizontal steel bars 24 and a plurality of vertical steel bars 25. The upper steel plate is welded below the plurality of horizontal steel bars, and the lower steel plate is welded above the plurality of horizontal steel bars.

[0031] It is to be noted that, in the present text, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a... " does not, without more limitations, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements, and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A bridge support preloading structure, comprising a pier cap and a bridge support, characterized in that, The bridge also includes a counter-tension structure. The bridge support includes three pairs of longitudinally distributed columns supported on the pier. Two columns in the same pair are distributed laterally, and the middle of the same pair of columns are connected together by a horizontal connecting rod. The columns in two adjacent rows of columns are connected together by a longitudinal connecting rod. Two columns in the same pair are supported below both ends of a horizontal distribution beam. All the horizontal distribution beams are supported below several longitudinal distribution beams distributed laterally. Several jack support beams are provided on the longitudinal distribution beams, and the jack support beams extend laterally. The counter-tension structure includes jacks and several rows of steel cables distributed longitudinally. The lower ends of the steel cables are fixed to the pier pier. The number of jack support beams is equal to the number of rows of steel cables. Each jack support beam is aligned with one row of steel cables. Several jacks are provided on the jack support beams distributed laterally. The jacks are aligned one-to-one with the steel cables, and the upper ends of the steel cables are fixed one-to-one with the jacks.

2. The bridge support prestressing structure according to claim 1, characterized in that, The jack is a hollow jack.

3. A bridge support prestressing structure according to claim 1 or 2, characterized in that, The jack support beam is made of two I-beams spliced ​​together. Several steel connecting plates are welded between the two I-beams and distributed laterally. The steel connecting plates fix the two I-beams together. The two I-beams are spaced apart to form a lower gap for the steel cable to pass through. The steel cable passes through the lower gap.

4. A bridge support prestressing structure according to claim 1 or 2, characterized in that, The jack support beam is made of two I-beams spliced ​​together. The jack is supported on the I-beams by two metal support blocks. An upper gap is formed between the two metal support blocks, and the steel cable passes through the upper gap.

5. A bridge support preloading structure according to claim 1, characterized in that, The steel cable is cast together with the bridge pier foundation.

6. A bridge support preloading structure according to claim 5, characterized in that, The steel cable is composed of at least three steel wires wound together. The lower end of the steel cable is connected to a connecting anchor, which is cast in the pier abutment. The connecting anchor includes an upper steel plate, a lower steel plate, and a connecting steel sleeve that connects the upper and lower steel plates together. The lower end of each steel wire passes through the upper steel plate and is then inserted into the connecting steel sleeve in a corresponding manner. The steel wire is fixed together with the connecting steel sleeve.

7. A bridge support preloading structure according to claim 6, characterized in that, The connecting steel sleeve is welded together with the upper steel plate and the lower steel plate.

8. A bridge support prestressing structure according to claim 7, characterized in that, When the connecting steel sleeve is welded to the upper steel plate, an upper welding ring is formed. The upper end of the outer circumferential surface of the connecting steel sleeve is provided with an upper chamfer surface. The upper chamfer surface and the upper steel plate form an upper annular groove, and the upper welding ring fills the upper annular groove. When the connecting steel sleeve is welded to the lower steel plate, a lower welding ring is formed. The lower end of the outer circumferential surface of the connecting steel sleeve is provided with a lower chamfer surface. The lower chamfer surface and the lower steel plate form a lower annular groove, and the lower welding ring fills the lower annular groove.

9. A bridge support prestressing structure according to claim 6, 7, or 8, characterized in that, The upper surface of the lower steel plate is provided with connecting recesses that correspond one-to-one with the inner cavity of the connecting steel sleeve, and the lower end of the steel wire is welded into the connecting recess.

10. A bridge support prestressing structure according to claim 6, 7, or 8, characterized in that, The connecting steel sleeve is provided with several rows of threaded holes distributed along the axial direction of the connecting steel pipe. The threaded holes in the same row are distributed in the vertical direction. The threaded holes are threaded with a set screw to press the steel wire into the connecting steel sleeve.

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