Self-balancing dragging support structure and construction method thereof

Abstract

The invention belongs to the technical field of bridge incremental launching construction. In order to solve the problems that the stability of a support structure is reduced and the steel consumption is increased due to horizontal thrust generated in the dragging process of a main beam, the self-balancing dragging support structure and the construction method thereof are provided, the structure comprises a temporary support, a sliding way beam assembly and a power device, and the sliding way beam assembly is arranged at the top of the temporary support; the power device comprises a heightened slideway beam and a standard slideway beam which are connected, and the power device comprises a dragging jack and a dragging counter-force seat which are arranged on the heightened slideway beam, a sliding block which is arranged at the bottoms of a beam body and a guide beam and abuts against a slideway beam assembly, a deviation rectifying device for rectifying deviation of the sliding block, a rear anchoring counter-force seat and a traction beam. The rear anchor counter-force base is arranged at the end of the beam body, the traction beam is connected with the dragging jack and the rear anchor counter-force base, the dragging jack drives the beam body to be dragged and move forwards by tensioning the traction beam, the structure eliminates horizontal thrust in the dragging process, and the steel consumption is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge jacking construction, and in particular relates to a self-balancing dragging support structure and a construction method thereof. Background Art

[0002] The dragging method is a commonly used construction method for bridge construction. It is widely used in bridge projects across operating railways, highways, deep valleys, etc. There are construction methods such as one-way dragging and two-way dragging. A working platform is set up on one side or both sides of the bridge design position along the longitudinal axis of the bridge. The working platform is used to construct the beam in sections or as a whole. The beam can be a prestressed concrete beam or a steel beam. After the dragging beam construction is completed, the beam is dragged to the target position using tractor machinery.

[0003] The dragging bracket, sliding device and force-applying device are the tools and equipment used in the dragging construction. The beam body will generate a large friction force when starting and stopping, and the friction force is converted into a horizontal thrust at the top of the bracket structure, especially for the bracket structure with a large height. The impact is greater. By strengthening the stiffness of the bracket column to resist the horizontal thrust, the amount of steel used also increases accordingly. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a self-balancing towing support structure and a construction method thereof which can reduce the horizontal thrust during the towing process and save the amount of steel.

[0005] A first aspect of the present invention provides a self-balancing towing support structure, comprising:

[0006] Temporary support;

[0007] A slideway beam assembly, the slideway beam assembly is arranged on the top of the temporary support, a guide beam and a beam body are arranged on the top of the slideway beam assembly, the temporary support is vertically arranged at the bottom of the guide beam and the beam body, the slideway beam assembly includes a heightened slideway beam and a standard slideway beam, and the standard slideway beam is connected to the heightened slideway beam;

[0008] The power device includes a towing jack, a towing reaction seat, a correction device, a slider, a rear anchor reaction seat and a traction bundle. The towing jack is arranged on the towing reaction seat, the towing reaction seat is arranged on the elevated slideway beam, the slider is arranged at the bottom of the beam body and the guide beam, and abuts against the slideway beam assembly. The correction device is arranged on the slideway beam assembly and is used to correct the deviation of the slider. The rear anchor reaction seat is arranged at the end of the beam body. The traction bundle is used to connect the towing jack and the rear anchor reaction seat. The towing jack drives the beam body to drag forward by tensioning the traction bundle.

[0009] Optionally, an MGE plate is provided at the bottom of the slider.

[0010] Optionally, it also includes a receiving bracket and an upper pier device, the upper pier device is arranged at the front end of the guide beam along the moving direction, a corner pad is arranged at the bottom of the upper pier device, and an upper pier jack is arranged at the position of the receiving bracket corresponding to the corner pad.

[0011] Optionally, the temporary support includes a foundation, columns, longitudinal beams and cross beams. The columns are set on the foundation, and the columns and the foundation are connected by embedded parts. A pier is formed between two adjacent columns through a connecting system. The longitudinal beams and cross beams are set on the top of the columns. The temporary support is used for prefabrication construction of the main beam or assembly construction.

[0012] Optionally, both the elevated slideway beam and the standard slideway beam are box beams, and the elevated slideway beam is connected to the standard slideway beam via a steel plate and a corbel plate.

[0013] A second aspect of the present invention provides a construction method of a self-balancing towing support structure, which is completed based on the above-mentioned self-balancing towing support structure, and includes the following steps:

[0014] S1. Measure and lay out the foundation position according to the design drawing of the self-balancing towing support, use drilling rigs and excavators to carry out foundation construction, determine the length of the column after the foundation construction is completed, connect it with the foundation after cutting, and then install the connection system, longitudinal beams and cross beams in sequence to form a rack and independent pier;

[0015] S2. While constructing the temporary support structure, make the heightened slideway beam, standard slideway beam, steel plate, bracket plate, drag reaction seat, slider, rear anchor reaction seat and deviation correction device according to the design drawings;

[0016] S3. Connect the drag reaction seat and the heightened slideway beam into a whole, lift them to the target position by crane, lift the first section of the standard slideway beam to the target position, connect them with steel plates, support the bottom with corbels, extend the standard slideway beam, and connect the standard slideway beam bracket with steel plates;

[0017] S4. After the top elevation and flatness of the slideway beam assembly meet the requirements, the guide beam and the beam body are assembled. The slider should be connected with the beam body and the guide beam rods in advance to form a whole. The steel beams are assembled on the temporary bracket according to the steel beam assembly sequence to form a steel beam with a drag segment;

[0018] S5. After the guide beam and the beam body are assembled, the rear anchor reaction seat is installed at the tail of the beam body, and the deviation correction device is installed at the same time;

[0019] S6. Install a towing jack on the towing reaction seat, connect the towing jack and the rear anchor reaction seat with a towing beam, and the towing jack drives the beam to be towed forward by tensioning the towing beam;

[0020] S7, after the beam body moves forward for a certain distance, the rest of the beam body is assembled on the towing bracket, and the beam body continues to be towed forward, and the deviation correction device is used to correct the deviation during the forward movement;

[0021] S8. When the beam body moves forward to the receiving bracket, the guide beam is manually assisted to go up the pier, and the pier jack is installed under the pier device. After the pier jack lifts the corner pad for a distance, a slider is installed at the front end. The jack is retracted, and the weight of the front end of the guide beam falls on the slider. The jack is removed, and finally the support is installed to drop the beam body to the designed position.

[0022] Compared with the prior art, the technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0023] An embodiment of the present invention provides a self-balancing towing support structure and a construction method thereof. This structure saves steel by arranging a slide beam assembly with supporting and towing functions on the top of a temporary support. The slide beam assembly includes a heightened slide beam and a standard slide beam. A towing jack and a towing reaction seat are arranged on the heightened slide beam, and a slider is arranged between the beam body, the guide beam and the slide beam assembly to reduce friction during towing. A rear anchor reaction seat is arranged at the end of the beam body, and the towing jack and the rear anchor reaction seat are connected by utilizing a traction beam. The towing jack drives the beam body to be towed forward by tensioning the traction beam, thereby eliminating horizontal thrust during towing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic structural diagram of a self-balancing towing support structure according to an embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of a pier on a self-balancing towing support structure according to an embodiment of the present invention;

[0028] Figure 3 It is a cross-sectional schematic diagram of a guide beam according to an embodiment of the present invention;

[0029] Figure 4 It is a schematic cross-sectional view of the beam body described in an embodiment of the present invention.

[0030] Among them, 1. Foundation; 2. Column; 3. Connection system; 4. Longitudinal beam; 5. Cross beam; 6. Heightened slideway beam; 7. Standard slideway beam; 8. Steel plate; 9. Corbel plate; 10. Drag jack; 11. Drag reaction seat; 12. Rear anchor reaction seat; 13. Beam body; 14. Correction device; 15. Slider; 16. Guide beam; 17. MGE plate; 18. Traction beam; 19. Upper pier device; 20. Corner pad; 21. Upper pier jack. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] Reference Figures 1 to 4 As shown, the first aspect of this embodiment provides a self-balancing towing support structure, including a temporary support, a slide beam assembly and a power device.

[0034] The temporary support includes a foundation 1, a column 2, a longitudinal beam 4 and a transverse beam 5. The column 2 is arranged on the foundation 1, and the column 2 and the foundation 1 are connected by embedded parts. Two adjacent columns 2 are connected by a connection system 3 to form a pier. The longitudinal beam 4 and the transverse beam 5 are arranged on the top of the column 2. The temporary support is used for the prefabrication of the main beam or assembly construction. Specifically, the temporary support is located on the longitudinal beam side of the designed position of the beam body 13. The towing support body is arranged on one side of the temporary support, and the receiving support is arranged on the other side. The temporary support adopts a beam-column support. The foundation 1 is a pile foundation pedestal structure. The type of foundation 1 is determined according to the geological conditions and the force. Pile foundations and expanded foundations can also be used. The piers are divided into two structures: row piers and independent piers. The independent piers are used to resist the small inertial horizontal thrust generated by starting and stopping during the towing process. The size of the independent pier pedestal is 5.0m×5.0m×2.0m4. 4m×6.6m×1.0m, the size of the frame pier cap is 2.4m×6.6m×1.0m, the column 2 is made of steel pipe with model φ630×8mm and φ426×8mm, the steel pipe model of column 2 at the pier bracket on both sides of the beam body 13 is φ630×8mm, and the steel pipe model of column 2 at other brackets is φ426×8mm, the connection system 3 between the columns 2 is made of φ300×8mm steel pipe, the longitudinal beam 4 and the cross beam 5 are made of 2I63b steel, and 10mm thick steel plates are welded on the top and bottom of the 2I63b steel.

[0035] Reference Figure 3and Figure 4 As shown, the slide beam assembly is arranged at the top of the temporary support, and a guide beam 16 and a beam body 13 are arranged at the top of the slide beam assembly. The temporary support is vertically arranged at the bottom of the guide beam 16 and the beam body 13. The slide beam assembly includes a heightened slide beam 6 and a standard slide beam 7. The standard slide beam 7 is connected to the heightened slide beam 6. The heightened slide beam 6 and the standard slide beam 7 are both box beams, and the heightened slide beam 6 is connected to the standard slide beam 7 through a steel plate 8 and a corbel plate 9. Specifically, the slideway beam assembly has supporting and dragging functions. The beam body 13 is generally dragged horizontally. The elevation of the slideway beam assembly is determined comprehensively according to the line slope and the support height, and should meet the space requirements of subsequent support construction, beam drop and other processes. The slideway beam assembly is installed on the top of the temporary support and adopts steel beam structures such as steel sections and welded parts. The size of the steel beam structure is determined according to the stress conditions of the steel beam under various working conditions during the dragging process. In order to save materials, the slideway beam at the receiving support and the dragging part needs to be heightened, so that the slideway beam assembly includes a heightened slideway beam 6 and a standard slideway beam 7. The heightened slideway beam 6 adopts a height of 1. The 9m box beam is welded from two steel plates with dimensions of 15000mm×1900mm×28mm and two steel plates with dimensions of 15000mm×1844mm×14mm. The standard slideway beam 7 is welded from I63a I-beam and 10mm thick steel plate. The standard slideway beam 7 is composed of six 12m long I63a I-beams and two steel plates with dimensions of 12000mm×1665mm×10mm to form a box beam. The dimensions of steel plate 8 are 400mm×600mm×14mm, and the dimensions of corbel plate 9 are 600mm×620mm×14mm.

[0036] The power device includes a towing jack 10, a towing reaction seat 11, a correction device 14, a slider 15, a rear anchor reaction seat 12 and a traction bundle 18. The towing jack 10 is arranged on the towing reaction seat 11, the towing reaction seat 11 is arranged on the elevated slideway beam 6, the slider 15 is arranged at the bottom of the beam body 13 and the guide beam 16, and abuts against the slideway beam assembly. The correction device 14 is arranged on the slideway beam assembly and is used to correct the slider 15. The rear anchor reaction seat 12 is arranged at the end of the beam body 13. The traction bundle 18 is used to connect the towing jack 10 and the rear anchor reaction seat 12. The towing jack 10 drives the beam body 13 to drag forward by tensioning the traction bundle 18. Specifically, the towing jack 10 adopts a continuous jack with a rated jacking force of 200t, which is placed on a towing reaction seat 11. The towing reaction seat 11 is connected to the elevated slideway beam 6. The rear anchor reaction seat 12 adopts an anchor beam structure and is arranged at the tail of the beam body 13 to be towed. The beam body 13 is a steel truss beam. The correction device 14 is arranged on the elevated slideway beam 6 and the standard slideway beam 7. The correction is performed by pushing the slider 15 installed thereon with the jack. The slider 15 is arranged at the bottom of the beam body 13 and the guide beam 16. The slider 15 is composed of I56a steel. An MGE plate 17 is arranged at the bottom of the slider 15 to reduce friction during towing. The size of the slider 15 and the spacing between multiple sliders 15 are determined by calculating the force acting on the beam body 13 and the temporary support.

[0037] Reference Figure 2 As shown, it also includes a receiving bracket and an upper pier device 19. The upper pier device 19 is arranged at the front end of the guide beam 16 along the moving direction. A corner pad 20 is arranged at the bottom of the upper pier device 19, and an upper pier jack 21 is arranged at the position of the receiving bracket corresponding to the corner pad 20.

[0038] The second aspect of the present embodiment provides a construction method for a self-balancing towing support structure, which is based on the above-mentioned self-balancing towing support structure. By investigating the beam body 13 structure, the highway or railway crossed, and the towing construction conditions, the key technical parameters are determined, and the self-balancing towing support structure is designed; a temporary support is set up on the line on both sides of the highway or railway, and after the elevation of the top of the support is checked, a slide beam assembly is installed on the top of the support, and a guide beam 16, a prefabricated beam body 13 or an assembled beam body 13 are installed on the slide beam assembly. The beam body 13 can be prefabricated or assembled as a whole at one time, or can be prefabricated or assembled in sections. When the beam body 13 is prefabricated or assembled in sections, the beam body 13 After being dragged a certain distance, the remaining part of the beam body 13 is then prefabricated or assembled; before the prefabrication or assembly of the beam body 13, a power device is set, a drag reaction seat 11 is welded at the front section of the elevated slideway beam 6, and a rear anchor reaction seat 12 is installed at the tail of the beam body 13 or other parts. When the beam body 13 is prefabricated, embedded parts required for installing the rear anchor reaction seat 12 should be set, and a matching drag jack 10 is installed on the drag reaction seat 11, and the temporary support structure and the beam body 13 are connected by a traction beam 18; the drag jack 10 is started to drag the beam body 13 to the target position, and the correction device 14 is used during the dragging process to ensure that the position of the beam body 13 meets the relevant requirements, and finally the support is installed to drop the beam body to the designed position.

[0039] The specific steps include:

[0040] S1. Measure and lay out the position of foundation 1 according to the design drawing of the self-balancing towing support, use a drilling rig and an excavator to construct foundation 1, determine the length of column 2 after the construction of foundation 1 is completed, connect it with foundation 1 after cutting, and then install the connection system 3, longitudinal beam 4 and cross beam 5 in sequence to form a bent frame and an independent pier;

[0041] S2. While constructing the temporary support structure, make the heightened slideway beam 6, standard slideway beam 7, steel plate 8, corbel plate 9, drag reaction seat 11, slider 15, rear anchor reaction seat 12 and deviation correction device 14 according to the design drawings;

[0042] S3, connect the drag reaction seat 11 and the heightened slideway beam 6 into a whole, use a crane to lift them to the target position, lift the first section of the standard slideway beam 7 to the target position, connect them with the steel plate 8, support the bottom with the corbel plate 9, extend the standard slideway beam 7, and connect the standard slideway beam 7 bracket with the steel plate 8;

[0043] S4. After the top surface elevation and flatness of the slideway beam assembly meet the requirements, the guide beam 16 and the beam body 13 are assembled. The slider 15 should be connected with the beam body 13 and the guide beam 16 in advance to form a whole. The steel beams are assembled on the temporary bracket according to the assembly sequence of the steel beams to form a steel beam with a drag segment;

[0044] S5. After the guide beam 16 and the beam body 13 are assembled, the rear anchor reaction seat 12 is installed at the tail of the beam body 13, and the deviation correction device 14 is installed at the same time;

[0045] S6. Install the towing jack 10 on the towing reaction seat 11. The towing beam 18 connects the towing jack 10 and the rear anchor reaction seat 12. The towing jack 10 drives the beam 13 to move forward by tensioning the towing beam 18.

[0046] S7, after the beam body 13 moves forward for a certain distance, the remaining beam bodies 13 are assembled on the towing bracket, and the beam body 13 continues to be towed forward, and the deviation correction device 14 is used to correct the deviation during the forward movement;

[0047] S8. When the beam body 13 moves forward to the receiving pier, the guide beam 16 is manually assisted to go up the pier, and the pier jack 21 is installed under the pier device 19. After the pier jack 21 lifts the corner pad 20 for a distance, the slider 15 is installed at the front end. The jack is retracted, and the weight of the front end of the guide beam 16 falls on the slider 15. The jack is removed, and finally the support is installed to drop the beam body 13 to the designed position.

[0048] The present invention optimizes the support structure and arranges a slideway beam assembly with supporting and dragging functions on the top, thereby eliminating the horizontal thrust during the dragging process and saving the amount of steel.

[0049] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0050] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features invented herein.

Claims

1. A self-balancing towing support structure, characterized in that: include: Temporary support; A slideway beam assembly, wherein the slideway beam assembly is arranged on the top of a temporary support, a guide beam (16) and a beam body (13) are arranged on the top of the slideway beam assembly, the temporary support is vertically arranged at the bottom of the guide beam (16) and the beam body (13), the slideway beam assembly comprises a heightened slideway beam (6) and a standard slideway beam (7), and the standard slideway beam (7) is connected to the heightened slideway beam (6); The power device comprises a towing jack (10), a towing reaction seat (11), a deviation correction device (14), a slider (15), a rear anchor reaction seat (12) and a traction bundle (18). The towing jack (10) is arranged on the towing reaction seat (11), the towing reaction seat (11) is arranged on a heightened slideway beam (6), the slider (15) is arranged at the bottom of the beam body (13) and the guide beam (16), and abuts against the slideway beam assembly, the deviation correction device (14) is arranged on the slideway beam assembly and is used for correcting the deviation of the slider (15), the rear anchor reaction seat (12) is arranged at the end of the beam body (13), and the traction bundle (18) is used for connecting the towing jack (10) and the rear anchor reaction seat (12), and the towing jack (10) drives the beam body (13) to be dragged forward by tensioning the traction bundle (18).

2. A self-balancing towing support structure according to claim 1, characterized in that: The bottom of the slider (15) is provided with an MGE plate (17).

3. A self-balancing towing support structure according to claim 2, characterized in that: It also includes a receiving bracket and an upper pier device (19), wherein the upper pier device (19) is arranged at the front end of the guide beam (16) along the moving direction, a corner pad (20) is arranged at the bottom of the upper pier device (19), and an upper pier jack (21) is arranged at a position on the receiving bracket corresponding to the corner pad (20).

4. A self-balancing towing support structure according to claim 3, characterized in that: The temporary support comprises a foundation (1), a column (2), a longitudinal beam (4) and a transverse beam (5); the column (2) is arranged on the foundation (1), and the column (2) and the foundation (1) are connected by embedded parts; two adjacent columns (2) are connected by a connecting system (3) to form a pier; the longitudinal beam (4) and the transverse beam (5) are arranged on the top of the column (2); and the temporary support is used for main beam prefabrication construction or assembly construction.

5. A self-balancing towing support structure according to claim 4, characterized in that: The heightened slideway beam (6) and the standard slideway beam (7) are both box beams, and the heightened slideway beam (6) and the standard slideway beam (7) are connected via a steel plate (8) and a corbel plate (9).

6. A construction method of a self-balancing towing support structure, based on the self-balancing towing support structure of claim 5, characterized in that: The following steps are involved: S1. According to the design drawing of the self-balancing towing support, the position of the foundation (1) is measured and laid out, and the foundation (1) is constructed using a drilling rig and an excavator. After the construction of the foundation (1) is completed, the length of the column (2) is determined, and the column (2) is connected to the foundation (1) after cutting, and then the connection system (3), the longitudinal beam (4) and the cross beam (5) are installed in sequence to form a rack and an independent pier; S2. While constructing the temporary support structure, the heightened slideway beam (6), the standard slideway beam (7), the steel plate (8), the bracket plate (9), the drag reaction seat (11), the slider (15), the rear anchor reaction seat (12) and the deviation correction device (14) are manufactured according to the design drawings; S3, connect the drag reaction seat (11) and the heightened slideway beam (6) into a whole, lift them to the target position by crane, lift the first section of the standard slideway beam (7) to the target position, connect them with steel plates (8), support the bottom with corbels (9), extend the standard slideway beam (7), and connect the standard slideway beam (7) bracket with steel plates (8); S4. After the top surface elevation and flatness of the slideway beam assembly meet the requirements, the guide beam (16) and the beam body (13) are assembled. The slider (15) should be connected to the beam body (13) and the guide beam (16) in advance to form a whole. The steel beams are assembled on the temporary support in the order of steel beam assembly to form a steel beam with a drag segment. S5, after the guide beam (16) and the beam body (13) are assembled, the rear anchor reaction seat (12) is installed at the tail of the beam body (13), and the deviation correction device (14) is installed at the same time; S6, installing a towing jack (10) on the towing reaction seat (11), connecting the towing jack (10) and the rear anchor reaction seat (12) by a towing beam (18), and the towing jack (10) drives the beam body (13) to be towed forward by tensioning the towing beam (18); S7, after the beam body (13) moves forward for a certain distance, the remaining beam bodies (13) are assembled on the towing bracket, and the beam body (13) is continued to be towed forward, and the deviation correction device (14) is used to correct the deviation during the forward movement; S8, when the beam body (13) moves forward to the receiving bracket, the guide beam (16) is manually assisted to go up the pier, and the pier jack (21) is installed under the pier device (19). After the pier jack (21) lifts the corner pad (20) for a certain distance, the slider (15) is installed at the front end. The jack is retracted, and the weight of the front end of the guide beam (16) falls on the slider (15). The jack is removed, and finally the support is installed to drop the beam body (13) to the designed position.

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