Cast-in-situ bridge prestressed formwork bottom support structure

Abstract

The utility model relates to bridge formwork structure technical field, concretely is a cast -in -situ bridge prestress formwork bottom support structure, including longitudinal support beam, the quantity is two groups and interval setting between two groups of piers, the top of two groups of longitudinal support beam is interval setting with a plurality of groups of cross support beam along the length direction, the both ends of longitudinal support beam bottom are fixedly arranged with a group of anchor bracket, the steel wire rope is arranged between two groups of anchor bracket, when setting up to bridge cast -in -situ formwork structure, through setting up steel wire rope and tensioning mechanism in the bottom of two groups of longitudinal support beam, make tensioning mechanism can pour the steel wire rope and be close -fitted when, thereby make steel wire rope exert the prestress to longitudinal support beam upwards, then through the collaborative stress of longitudinal support beam, cross support beam and bailey truss, reduce longitudinal support beam's deformation when pouring, guarantee the stability of support.

Description

Technical Field

[0001] This application relates to the field of bridge formwork structure technology, specifically a prestressed formwork bottom support structure for cast-in-place bridges. Background Technology

[0002] In the construction of cast-in-place bridges, the stability of the formwork structure is directly related to the alignment and structural safety of the completed bridge.

[0003] The common formwork support method currently involves setting up multiple sets of vertical support columns between adjacent piers. These columns support the beam bottom formwork system at their tops, providing the necessary support reaction force for concrete pouring and prestressing tensioning. This structure has a clear force transmission path and simple construction, but its support effectiveness largely depends on the stability of the foundation beneath the support columns. In practice, compared to the stable structural support of piers located in bedrock or with pile foundations, support columns are usually placed directly on the ground (or with structural support such as pads). If the soil beneath the bridge site is soft, has insufficient bearing capacity, or experiences uneven settlement, the support columns are highly susceptible to sinking or displacement. This not only causes errors in formwork elevation, affecting bridge alignment control, but may also lead to instability of the formwork system before the concrete reaches its strength, resulting in insufficient support stability. Utility Model Content

[0004] To address the problem of poor support stability in existing technologies, this utility model provides a prestressed formwork support structure for cast-in-place bridges.

[0005] Therefore, the specific technical solution adopted by this utility model is as follows: This utility model provides a prestressed formwork support structure for cast-in-place bridges, installed on the bridge piers, characterized in that it includes: There are two sets of longitudinal support beams, spaced apart between the two sets of piers. The top of the piers is equipped with unloading bearings. Each end of the longitudinal support beam is set on an unloading bearing of a pier. Multiple sets of transverse support beams are spaced apart along the length of the top of the two sets of longitudinal support beams. Bailey bridges are set on the top of the transverse support beams. An anchor is fixed at each end of the bottom of the longitudinal support beam. A steel wire rope is threaded between the two sets of anchors. A tensioning mechanism is set between the two sets of anchors on the longitudinal support beam. The tensioning mechanism is used to abut and tighten the steel wire rope. A bottom support mechanism is provided at the bottom of the longitudinal support beam.

[0006] Preferably, the tensioning mechanism includes a mounting base, a hydraulic cylinder, and an abutment block. The mounting base is fixedly installed at the bottom of the longitudinal support beam, and the abutment block is slidably installed at the bottom of the mounting base. A hydraulic cylinder is installed between the mounting base and the abutment block, and the hydraulic cylinder is fixedly connected to the mounting base. The output shaft of the hydraulic cylinder abuts against the abutment block, and the end of the abutment block away from the hydraulic cylinder abuts against the wire rope.

[0007] Preferably, the bottom support mechanism includes a lower support beam, support columns, and a top support beam. The number of top support beams is multiple and they are arranged at intervals along the length direction at the bottom of the longitudinal support beam. The top of the top support beam abuts against the bottom of the longitudinal support beam. The lower support beam is located below the top support beam and is connected to the bottom of the top support beam. The number of support columns is multiple and they are arranged at intervals at the bottom of the lower support beam.

[0008] Preferably, the top support beam includes a support plate and a fixing plate. There are two sets of fixing plates, which are vertically fixed on both sides of the bottom of the support plate. The bottom of the fixing plate is fixedly connected to the top of the lower support beam. The fixing plate is provided with a through hole, through which a steel wire rope is threaded.

[0009] Preferably, both the horizontal support beam and the lower support beam are H-beams.

[0010] Preferably, a load-bearing support is fixedly provided at the top of the support column, and the top of the load-bearing support abuts against the bottom of the lower support beam.

[0011] Preferably, the mounting bases are in multiple sets and spaced apart on the longitudinal support beams.

[0012] The advantages of adopting the above technical solution are: This utility model includes two sets of longitudinal support beams spaced apart between two sets of piers. Multiple sets of transverse support beams are spaced apart along the length of the top of the two sets of longitudinal support beams. An anchor is fixed at each end of the bottom of the longitudinal support beams, and a steel wire rope is threaded between the two sets of anchors. During the erection of the cast-in-place formwork structure for the bridge, steel wire ropes and tensioning mechanisms are installed at the bottom of the two sets of longitudinal support beams. The tensioning mechanism can then tighten the steel wire ropes during pouring, thereby applying upward prestress to the longitudinal support beams. The coordinated force of the longitudinal support beams, transverse support beams, and Bailey bridge reduces the deformation of the longitudinal support beams during pouring, ensuring the stability of the support. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of the structure of this utility model is shown; Figure 2 A partial structural schematic diagram of the present invention is shown; Figure 3 A partial structural schematic diagram of the present invention is shown; Figure 4 A partially enlarged view of part A of this utility model is shown.

[0015] The components are: 1. Pier; 11. Unloading bearing; 2. Longitudinal support beam; 201. Anchor seat; 202. Mounting seat; 203. Abutment block; 3. Transverse support beam; 4. Bailey bridge; 5. Hydraulic cylinder; 6. Wire rope; 7. Lower support beam; 8. Support column; 9. Top support beam; 901. Support plate; 902. Fixing plate; 903. Through hole. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] like Figure 1-4 As shown in the figure, this utility model embodiment discloses a prestressed formwork bottom support structure for cast-in-place bridges, which is set on pier 1 and includes longitudinal support beams 2 and a bottom support mechanism. There are two sets of longitudinal support beams 2, which are spaced apart between the two sets of piers 1. The top of the pier 1 is provided with a load-bearing support 11. The two ends of the longitudinal support beams 2 are each set on the load-bearing support 11 of the pier 1. Multiple sets of transverse support beams 3 are spaced apart along the length direction on the top of the two sets of longitudinal support beams 2. Bailey bridges 4 are provided on the top of the transverse support beams 3. An anchor 201 is fixedly set at both ends of the bottom of the longitudinal support beams 2. A steel wire rope 6 is threaded between the two sets of anchor 201. A tensioning mechanism is provided between the two sets of anchor 201 on the longitudinal support beams 2. The tensioning mechanism is used to abut and tighten the steel wire rope 6. The bottom support mechanism is set at the bottom of the longitudinal support beams 2.

[0018] In at least one embodiment, the tensioning mechanism includes a mounting base 202, a hydraulic cylinder 5, and an abutment block 203. The mounting base 202 is fixedly disposed at the bottom of the longitudinal support beam 2, and the abutment block 203 is slidably disposed at the bottom of the mounting base 202. The hydraulic cylinder 5 is disposed between the mounting base 202 and the abutment block 203, and the hydraulic cylinder 5 is fixedly connected to the mounting base 202. The output shaft of the hydraulic cylinder 5 abuts against the abutment block 203, and the end of the abutment block 203 away from the hydraulic cylinder 5 abuts against the wire rope 6. When applying an upward prestress to the longitudinal support beam 2, the operator controls the hydraulic cylinder 5 at the bottom of the mounting base 202 to operate, so that its output shaft drives the abutment block 203 to extend downward, thereby opening and tightening the wire rope 6. After tightening, the wire rope 6 applies an upward prestress to the longitudinal support beam 2 through the hydraulic cylinder 5 and the mounting base 202.

[0019] In at least one embodiment, the bottom support mechanism includes a lower support beam 7, support columns 8, and a top support beam 9. Multiple sets of top support beams 9 are spaced apart along the length of the bottom of the longitudinal support beam 2. The top of the top support beam 9 abuts against the bottom of the longitudinal support beam 2. The lower support beam 7 is located below the top support beam 9 and connected to its bottom. Multiple sets of support columns 8 are spaced apart at the bottom of the lower support beam 7. The top support beam 9 is located at the bottom of the longitudinal support beam 2 and abuts against it. The lower support beam 7 is located below the top support beam 9 and abuts against it. The bottom of the support column 8 is fixedly connected to the concrete base on the ground. The top of the support column 8 abuts against the bottom of the lower support beam 7. Part of the load on the longitudinal support beam 2 is transferred to the ground through the top support beam 9, lower support beam 7, and support columns 8, thus providing auxiliary support for the longitudinal support beam 2, reducing its deformation, and ensuring the stability of the support.

[0020] In at least one embodiment, the top support beam 9 includes a support plate 901 and a fixing plate 902. There are two sets of fixing plates 902, which are vertically fixed on both sides of the bottom of the support plate 901. The bottom of the fixing plate 902 is fixedly connected to the top of the lower support beam 7. The fixing plate 902 is provided with a through hole 903, through which the wire rope 6 passes. The wire rope 6 passes through the through hole 903 of the fixing plate 902. When the output shaft of the hydraulic cylinder 5 drives the wire rope 6 to perform tension adjustment, the wire rope 6 can move up and down in the through hole 903. The support plate 901 and the two sets of fixing rods abut against the longitudinal support beam 2 to ensure the stability of the abutment support.

[0021] In at least one embodiment, both the horizontal support beam 3 and the lower support beam 7 are H-beams, and setting the horizontal support beam 3 and the lower support beam 7 as H-beams ensures that they have good bending strength.

[0022] In at least one embodiment, a load-bearing support 11 is fixedly provided on the top of the support column 8. The top of the load-bearing support 11 abuts against the bottom of the lower support beam 7. By providing the load-bearing support 11, the support column 8 is prevented from directly abutting against the lower support beam 7, thus preventing the lower support beam 7 from directly applying load to the support column 8 during the pouring operation and causing damage to the support column 8, and ensuring the continuous and effective support of the support column 8.

[0023] In at least one embodiment, the mounting bases 202 are arranged in multiple sets at intervals on the longitudinal support beam 2. The multiple sets of support bases can abut and tighten the wire rope 6 at multiple points, so that it can apply prestress to the longitudinal support beam 2 at multiple points, thereby further improving the stability of the longitudinal support beam 2.

[0024] When erecting the formwork structure for a cast-in-place bridge, workers install unloading supports 11 on the top of pier 1. Then, two sets of longitudinal support beams 2 are erected between the two sets of pier 1. Both ends of the longitudinal support beams 2 are respectively mounted on the unloading supports 11 on one set of pier 1. The unloading supports 11 prevent direct force transmission between the longitudinal support beams 2 and pier 1, thus avoiding damage to pier 1 when loads are applied to the longitudinal support beams 2. Afterwards, multiple sets of transverse support beams 3 are erected at intervals on top of the two sets of longitudinal support beams 2. Both ends of each transverse support beam 3 are located on one set of longitudinal support beams 2. After the transverse support beams 3 are erected, multiple sets of Bailey bridges 4 are erected on top of the transverse support beams 3. The template structure is erected, with steel wire ropes 6 threaded through two sets of anchors 201 at the bottom of the longitudinal support beam 2. The tensioning mechanism at the bottom of the longitudinal support beam 2 abuts and expands the steel wire ropes 6, putting them in a taut state. The taut steel wire ropes 6 provide reverse support to the longitudinal support beam 2 through the tensioning mechanism, ensuring the support strength of the longitudinal support beam 2. Through the coordinated force of the longitudinal support beam 2, the transverse support beam 3, and the Bailey bridge 4, the deformation of the longitudinal support beam 2 during bridge pouring is reduced, avoiding the direct transfer of the load of the poured body to the ground. Furthermore, the bottom support mechanism at the bottom of the longitudinal support beam 2 can provide further abutment and support, improving the support stability of the longitudinal support beam 2.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A prestressed formwork support structure for cast-in-place bridges, installed on the bridge piers, characterized in that: include There are two sets of longitudinal support beams, spaced apart between the two sets of piers. The top of the piers is equipped with unloading bearings. Each end of the longitudinal support beam is set on an unloading bearing of a pier. Multiple sets of transverse support beams are spaced apart along the length of the top of the two sets of longitudinal support beams. Bailey bridges are set on the top of the transverse support beams. An anchor is fixed at each end of the bottom of the longitudinal support beam. A steel wire rope is threaded between the two sets of anchors. A tensioning mechanism is set between the two sets of anchors on the longitudinal support beam. The tensioning mechanism is used to abut and tighten the steel wire rope. A bottom support mechanism is provided at the bottom of the longitudinal support beam.

2. The prestressed formwork support structure for cast-in-place bridges according to claim 1, characterized in that: The tensioning mechanism includes a mounting base, a hydraulic cylinder, and an abutment block. The mounting base is fixedly installed at the bottom of the longitudinal support beam. The abutment block is slidably installed at the bottom of the mounting base. A hydraulic cylinder is installed between the mounting base and the abutment block. The hydraulic cylinder is fixedly connected to the mounting base. The output shaft of the hydraulic cylinder abuts against the abutment block. The end of the abutment block away from the hydraulic cylinder abuts against the wire rope.

3. The prestressed formwork support structure for cast-in-place bridges according to claim 1, characterized in that: The bottom support mechanism includes a lower support beam, support columns, and a top support beam. There are multiple sets of top support beams, which are spaced apart along the length direction at the bottom of the longitudinal support beams. The top of the top support beams abuts against the bottom of the longitudinal support beams. The lower support beams are located below the top support beams and are connected to the bottom of the top support beams. There are multiple sets of support columns, which are spaced apart at the bottom of the lower support beams.

4. The prestressed formwork support structure for cast-in-place bridges according to claim 3, characterized in that: The top support beam includes a support plate and a fixing plate. There are two sets of fixing plates, which are vertically fixed on both sides of the bottom of the support plate. The bottom of the fixing plate is fixedly connected to the top of the lower support beam. The fixing plate is provided with through holes, through which steel wire ropes are threaded.

5. The prestressed formwork support structure for cast-in-place bridges according to claim 3, characterized in that: Both the horizontal support beam and the lower support beam are H-beams.

6. The prestressed formwork support structure for cast-in-place bridges according to claim 3, characterized in that: The top of the support column is fixedly provided with an unloading support, and the top of the unloading support abuts against the bottom of the lower support beam.

7. The prestressed formwork support structure for cast-in-place bridges according to claim 2, characterized in that: The mounting bases are in multiple sets and are spaced apart on the longitudinal support beams.

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