CN101440604A - Cable opposite pulling type pier-side bracket - Google Patents

Abstract

A steel cable pull-type pier side bracket, related to the support system used in the construction of the bridge superstructure, including four parts: the upper platform, the pull system, the diagonal brace, and the lower hoop. The upper platform is symmetrically arranged on the left and right sides of the pier body There are two long beams arranged in parallel on the outer side of the long beams, several short beams are arranged between the beams, and a connecting system A is arranged between the two adjacent short beams, and the short beams and There is a connection system B between the long longitudinal beams; the tension system includes two parallel steel cables arranged in parallel, and the two ends of the parallel steel cables are fixedly connected by anchors and long longitudinal beams respectively; the lower hoop is arranged under the upper platform, including The hoops are arranged symmetrically to the contour of the pier body. The hoops are pulled against the pier body through the fine-rolled threaded steel rods to make them closely adhere to the pier body; It is fixedly connected with the hoop. The invention has the advantages of simple structure, low cost, strong load bearing capacity, small deformation, convenient installation and operation and no damage to the main structure.

Description

A steel cable pull type bracket beside the pier

technical field

The invention relates to a supporting system used in the construction of the superstructure of a bridge, in particular to a steel cable pull-type bracket next to a pier.

Background technique

As the pace of domestic high-grade highway and railway construction continues to accelerate, the application of mobile formwork and bridge erecting machines for bridge construction is becoming more and more extensive. As the load bearing system of the mobile formwork or bridge erecting machine, the bracket beside the pier is the key to ensure the safety of bridge construction.

At present, steel beams, steel belts or precision-rolled threaded steel bars are generally used for the double-tension structure of the bracket beside the pier. For the former (steel beam, steel belt), there is inconvenience in installation, large deformation of the bracket, and easy occurrence of the double-tension structure. Defects such as breakage; for the latter (finish-rolled rebar), when the load is large or the distance between the cantilever of the bracket is large, it will lead to the disadvantages of large tensile force, a large number of required finish-rolled rebar, and the tensioning operation process is complicated. , It is difficult to arrange the reinforcement and ensure that each reinforcement is evenly stressed.

The connection between the existing bracket beside the pier and the pier body is connected by slotting holes on the pier body or pre-embedding steel members. This structural form is easy to leave corrosion sources for the bridge structure in the bay waters, and has a negative impact on the appearance and durability of the structure. huge influence.

Contents of the invention

In view of the defects existing in the prior art, the purpose of the present invention is to provide a steel cable pull-type pier side bracket, which has a simple structure, low cost, strong load bearing capacity, small deformation, convenient installation and operation, and does not damage the main structure.

For achieving above object, the technical scheme that the present invention takes is:

A steel cable pull-type pier side bracket, characterized in that it includes four parts: an upper platform, a pull system, a diagonal brace, and a lower hoop. The upper platform includes symmetrically arranged on the left and right sides of the pier body 10, A long stringer 102 adapted to the profile of the pier body, two parallel beams 101 are arranged on the outer side of the long stringer 102, and a number of short stringers 103 are arranged between the beams 101, and two adjacent short stringers 103 is provided with connecting system A104, and between short longitudinal beam 103 and long longitudinal beam 102 is provided with connecting system B105; Said tension system comprises two parallel steel cables 202 arranged in parallel, and the two ends of parallel steel cables 202 pass through the anchor respectively. The tool 201 is fixedly connected with the long longitudinal beam 102; the said lower hoop is arranged under the upper platform, including hoops 401 which are arranged symmetrically with the contour of the pier body. Pulling to make it close to the pier body; said diagonal brace includes a number of supporting diagonal rods, and the two ends of the supporting diagonal rods are fixedly connected with the beam 101 and the hoop 401 respectively.

On the basis of the above technical solution, the two ends of the support slant are fixedly connected to the beam 101 and the hoop 401 respectively through pin shafts, and several support slant links 306 for connecting them as a whole are provided between the support slant.

On the basis of the above-mentioned technical scheme, the parallel steel cable 202 is tensioned with a jack to increase the frictional force between the long longitudinal beam 102 and the pier body. The frictional force between the big hoop 401 and the pier body.

On the basis of the above technical solution, a hard rubber pad is provided between the long longitudinal beam 102 and the pier body 10, and a hard rubber pad is provided between the hoop 401 and the pier body 10.

The steel cable pair-pull type pier side bracket of the present invention has simple structure, low cost, strong load bearing capacity, small deformation, convenient installation and operation, and does not damage the main structure. The tension-bearing structure with steel cables as brackets can reliably transmit the load to the pier structure without damaging the main structure.

Description of drawings

The present invention has following accompanying drawing:

Figure 1 Layout of the front and elevation of the bracket next to the steel cable pull type pier

Figure 2 Plane layout of the upper platform and cable tension system

Figure 3 Plane layout of the lower hoop

Figure 4 Layout of the side elevation of the bracket next to the cable pull type pier

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the lower end of the pier body 10 is a cap 20, and the steel cable pair-pull type pier bracket in the present invention includes four parts: an upper platform, a pair-pull system, a diagonal brace, and a lower hoop. As shown in Figures 1, 2, 3, and 4, the upper platform includes long stringers 102 symmetrically arranged on the left and right sides of the pier body 10 and adapted to the contour of the pier body. There are two beams 101 arranged in parallel, several short beams 103 are arranged between the beams 101, a connecting system A104 is provided between two adjacent short beams 103, and a coupling system is provided between the short beams 103 and the long beams 102. System B105; said tensioning system includes two parallel steel cables 202 arranged in parallel, and the two ends of parallel steel cables 202 are fixedly connected by anchors 201 and long longitudinal beams 102 respectively; said lower hoop is arranged on the upper platform The lower part includes hoops 401 that are arranged symmetrically to the contour of the pier body. The hoops 401 are pulled against the pier body through the fine-rolled threaded steel rods 402 to make them closely adhere to the pier body; Both ends of the support slant are fixedly connected to the beam 101 and the hoop 401 respectively.

On the basis of the above technical solution, the two ends of the support slant are fixedly connected to the beam 101 and the hoop 401 respectively through pin shafts, and several support slant links 306 for connecting them as a whole are provided between the support slant.

On the basis of the above-mentioned technical scheme, the parallel steel cable 202 is tensioned with a jack to increase the frictional force between the long longitudinal beam 102 and the pier body. The frictional force between the big hoop 401 and the pier body.

On the basis of the above technical solution, a hard rubber pad is provided between the long longitudinal beam 102 and the pier body 10, and a hard rubber pad is provided between the hoop 401 and the pier body 10.

In the above-mentioned technical scheme, said crossbeam 101 and short longitudinal beam 103 are all steel box girder structures welded by steel plates, and long longitudinal beams 102 are box girders imitating the profile of the pier body welded by steel plates. The short longitudinal beams 103 are welded to each other to form the upper platform frame, and the connection system A104 and the connection system B105 are welded with section steel, and are connected to the upper platform frame as a whole through the gusset plate. The number of short longitudinal beams 103 is usually at least two, and the number of short longitudinal beams 103 in FIG. 2 is two, and the number can be increased according to actual needs. The said tensioning system passes through the reserved anchor holes on both sides of the long longitudinal beam 102, installs the nuts, and simultaneously pulls the two steel cables 202 to the designed tonnage at one time with the tension jack, at this time, the upper platform and the pier body A preload is applied between them. Usually, the finished parallel steel cable can provide hundreds of tons or even thousands of tons of pretension. This tension is an internal force, which can reduce the size of the bracket structure, thereby making the bracket structure beside the pier light and easy to disassemble and assemble. The hoop 401 is a special-shaped structure welded by steel plates, and its shape is manufactured according to the outer contour of the pier body. After being installed in place, the hoop 401 on both sides of the pier body is pulled against each other with a fine-rolled threaded steel bar 402, so that the hoop 401 is closely connected to the pier body. In this way, the upper load can be evenly transmitted to the pier body without damaging the pier body, eliminating the impact of slotting or embedded parts on the permanent structure. Said slanting brace includes several supporting slanting rods, the specific number of supporting slanting rods is calculated according to the force, and different setting methods can be arranged according to different situations, as shown in Fig. 1 and 4 in the specific embodiment, the said The slant brace includes the outer support slant bar 301, the middle support slant bar 302 and the inner support slant bar 303 arranged symmetrically from outside to inside. 1. The outer top surface of the hoop 401 is fixedly connected, the two ends of the middle support slanting bar 302 are fixedly connected through the pin shaft A304 and the bottom surface of the middle part of the beam 101, and the inner top surface of the hoop 401, and the two ends of the inner support slanting bar 303 are respectively passed through the pin shaft B305 and The bottom surface of the inner end of the beam 101 and the top surface of the middle part of the hoop 401 are fixedly connected. Among them, the outer support slant 301 and the middle support slant 302 are box-shaped members welded by steel plates to transmit the main upper load; the inner support slant 303 is a steel member to prevent the upper platform from moving along the inclined surface of the pier body. Sliding down; the slanting bar coupling system 306 is welded with section steel, which respectively connects the left and right outer supporting slanting bars 301 and the left and right middle supporting slanting bars 302 as a whole. The specific shape and structure of the diagonal bar coupling system 306 can be set as shown in FIG. 4 , and can also be implemented according to known techniques.

On the basis of the above-mentioned technical scheme, as shown in Figure 4, the thickness of the outer support oblique bar 301 and the middle support oblique bar 302 is the same and thicker than the inner support oblique bar 303, and the inner support oblique bar 303 is arranged symmetrically between the outer support oblique bar 301 and the inner support oblique bar 303. The middle support slanting rods 302 are inwardly biased.

After the installation of the present invention is completed, the upper load directly acts on the top surface of the upper platform, and the two sets of upper platforms on both sides of the pier body are connected by the tension system on both sides to balance the horizontal force, and the diagonal bracing transfers the load of the upper platform to the lower hoop, Pass to pier body 10 and cap 20 by lower hoop again. The steel cable opposite-pull type pier side bracket of the present invention adopts the finished steel cable as the opposite tension system, which can be stretched quickly and accurately, and can provide a relatively large opposite tension, so that the deformation of the bracket after bearing the upper load is small; the lower part of the bracket No embedded parts are provided, but the lower hoop closely attached to the pier body of the cap is set, so that the upper load is evenly transmitted to the pier body and the cap.

Compared with the prior art, the present invention has the main advantage that: the load transmission mode is different: the common bracket is provided with embedded parts on the pier body, and the vertical load is transmitted by means of the embedded parts bearing shear force. The present invention does not set up embedded parts that will affect the durability of the pier body. By arranging high-strength parallel steel wire ropes and fine-rolled threaded thick steel bars between the upper platforms and lower hoops, and using a jack tensioning method, a powerful force is applied. Prestressing, so that the upper platform and the lower hoop and the pier body generate strong friction to resist the vertical load on the bracket. Materials with a large friction coefficient between the upper platform, the lower hoop and the pier body, such as hard rubber pads, can be arranged between the contact surfaces of the upper platform, the lower hoop and the pier body, so as to increase the friction of the contact surfaces, thereby increasing the bearing capacity of the bracket.

Claims (5)

1. A steel cable pull-type pier side bracket is characterized in that it includes four parts: an upper platform, a pull system, a diagonal brace, and a lower hoop, and the said upper platform is included on the left and right sides of the pier body (10) Symmetrically arranged long longitudinal beams (102) adapted to the outline of the pier body, two parallel beams (101) are arranged on the outer sides of the long longitudinal beams (102), and several short beams (101) are arranged between the beams (101). For the longitudinal beams (103), a connecting system A (104) is provided between two adjacent short longitudinal beams (103), and a connecting system B (105) is provided between the short longitudinal beams (103) and the long longitudinal beams (102); Said tensioning system includes two parallel steel cables (202) arranged in parallel, and the two ends of the parallel steel cables (202) are fixedly connected by anchors (201) and long longitudinal beams (102) respectively; said lower hoop It is arranged below the upper platform, including hoops (401) that are symmetrically arranged left and right to match the contour of the pier body, and the hoops (401) are pulled against each other by the finish-rolled threaded steel rods (402) so that they are closely attached to the pier body; Said diagonal bracing includes several supporting diagonal rods, and the two ends of the supporting diagonal rods are fixedly connected with the beam (101) and the hoop (401) respectively. 2. The cable-to-pull bracket next to the pier as claimed in claim 1, characterized in that: the two ends of the supporting slanting bar are respectively fixedly connected with the crossbeam (101) and the hoop (401) through pin shafts, and the supporting slanting bar There are several diagonal bracing linkages (306) for connecting them as a whole. 3. The steel cable pull-type pier side bracket as claimed in claim 1 or 2, characterized in that: the parallel steel cables (202) are tensioned with a jack to apply prestress to increase the length of the long longitudinal beam (102) and the pier body The friction force between the hoops (401) and the pier body is increased by tensioning the finish-rolled threaded steel bar (402) with a jack to apply prestress. 4. As claimed in claim 1 or 2, the cable pull-type bracket next to the pier is characterized in that: a hard rubber pad is provided between the long longitudinal beam (102) and the pier body (10), and the hoop (401) and A hard rubber pad is provided between the pier body (10). 5. The steel cable pair-pull type pier side bracket according to claim 3, characterized in that: a hard rubber pad is provided between the long longitudinal beam (102) and the pier body (10), and the hoop (401) and the pier body (10) are provided with hard rubber pads.

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