A temporary steel beam support structure across an existing line and a steel beam construction method

Abstract

The present invention discloses a temporary support structure for steel beams across existing lines, including two groups of support systems and a support bracket; the two groups of support systems are symmetrically arranged on both sides of the existing line, and the lower ends of the support systems are arranged on the ground; the support bracket spans the existing line and is installed on the two support systems; the steel beams to be installed are hoisted in sections on the support bracket. A method for constructing steel beam sections across existing lines. The beneficial effects of the present invention are as follows: the temporary support structure and steel beam construction method described in the present invention can complete the hoisting of steel beams across existing lines without hindering the normal passage of existing lines. This method of directly hoisting in blocks by a crane makes up for the shortcomings and limitations of the traditional jacking method; and the present invention is also applicable to situations where the entire steel beam is overweight and cannot be hoisted as a whole but can only be hoisted in pieces, and situations where the steel beam to be constructed is located on a circular curve with a relatively large radius and arc line shape.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a temporary steel beam support structure spanning an existing line and a steel beam construction method. Background Art

[0002] With the rapid development of my country's infrastructure construction and transportation industry, more and more bridges are being built across the sea and across rivers as well as on land. The complex environment and working conditions of various bridge construction and erection have also become a considerable challenge. Different bridges have different construction methods due to their different construction environments, involving different temporary supports and installation technologies. In addition, considering factors such as project progress and construction speed, safety and economy, how to optimize temporary supports and their construction methods under the conditions of meeting technical and economic requirements during the construction and installation of bridges is the key and also a key technical issue that needs to be solved.

[0003] At present, the more mature steel beam erection schemes in China mainly include: the scaffolding method, the floating erection method and the jacking erection method. In short, the scaffolding method is to cast the concrete bridge in place or assemble prefabricated sections on a ground-based scaffolding (also called scaffolding); the floating erection method is mainly used for water construction; the jacking erection method means that when the structure needs to pass under the embankment of an existing line, in order not to disturb the existing line, the structure can be built in sections on one side of the embankment, and then pushed with a jack to pass through the embankment.

[0004] Traditional steel beam construction across existing lines generally adopts the top-pushing erection method. Top-pushing construction does not affect the traffic under the bridge, does not require large lifting equipment, and does not involve high-altitude operations. It is particularly suitable for the construction of urban bridges with extra-large spans, long-line approach bridges or grade separations. Since the beam sections are periodically constructed on a fixed site, the construction quality and progress are easy to guarantee. However, the top-pushing construction method has the following obvious defects: there are many restrictions on the geometric shape of the bridge structure, and the variable-section beam sections, curved beam axes and variable-slope bridges cannot be constructed by top-pushing. Due to the constant change in the force of the bridge span structure during the top-pushing process, the beam height and material consumption will increase, especially the consumption of prestressed steel bars. Due to the limitation of the top-pushing cantilever bending moment, it is not economical to push the span greater than 70 to 80 meters. The repeated stress during the top-pushing process makes the beam height large, the temporary bundles are many, and the tensioning process is cumbersome. In addition, the top-pushing construction can only have two working surfaces at most, which also limits the speed of the top-pushing construction. Summary of the invention

[0005] The purpose of the present invention is to provide a temporary support structure for installing a steel beam across an existing line and a steel beam construction method in view of the deficiencies in the prior art.

[0006] The technical solution adopted by the present invention is: a temporary support structure for steel beams spanning an existing line, comprising two groups of support systems and a supporting frame; the two groups of support systems are symmetrically arranged on both sides of the existing line, and the lower ends of the support systems are arranged on the ground; the supporting frame spans the existing line and is installed on the two support systems; the steel beams to be installed are hoisted in sections on the supporting frame.

[0007] According to the above solution, the support frame is composed of a number of horizontal beams arranged at equal intervals in the transverse direction and a number of longitudinal beams arranged at equal intervals in the longitudinal direction, which are connected to each other to form a stable frame structure.

[0008] According to the above scheme, the longitudinal beam includes a longitudinal beam body, a longitudinal beam panel and a longitudinal beam web. The longitudinal beam panel is fixed to the upper surface and the lower surface of the longitudinal beam body, and the longitudinal beam web is fixed to the two outer side surfaces of the longitudinal beam body.

[0009] According to the above scheme, the longitudinal beam main body includes a number of longitudinal beam partitions arranged at intervals along the length direction of the longitudinal beam, and a plurality of longitudinal beam reinforcing ribs; the longitudinal beam partitions are frame-type structures, and mounting holes matching the number and positions of the longitudinal beam reinforcing ribs are provided on the longitudinal beam partitions; the longitudinal beam reinforcing ribs pass through the mounting holes at corresponding positions of all longitudinal beam partitions in sequence, and the longitudinal beam partitions and the longitudinal beam reinforcing ribs together form the longitudinal beam main body structure.

[0010] According to the above scheme, each support system includes a plurality of leg structures installed at intervals along the length direction of the existing line, each leg structure includes a pre-buried base, a plurality of vertical poles and a lap joint structure, the lower ends of all vertical poles are fixedly connected to the pre-buried base, and the upper ends of all vertical poles are connected to the lap joint structure.

[0011] According to the above scheme, a number of vertical pole cross braces are installed at intervals along the axial direction between two adjacent vertical poles; and the two sides of the support bracket are respectively fixed on the overlap structure.

[0012] According to the above scheme, the overlap structure includes two parallel short rods and a support cross brace fixed to the upper part of the two connecting rods; the connecting rod is fixed to a pad connecting the upper ends of the vertical rods in the same row / line, and multiple vertical stiffening plates are arranged on both sides of the support cross brace; the support bracket is fixed on the support cross brace.

[0013] According to the above scheme, a horizontal pad is installed on the upper end of the vertical pole, and the outer edge of the pad extends radially outward; a plurality of triangular ribs arranged at intervals along the circumferential direction are provided between the extended section of the pad and the outer wall of the vertical pole.

[0014] The present invention also discloses a method for constructing a steel beam section across an existing line, comprising the following steps:

[0015] Step 1: erecting the temporary support structure according to claim 1 between two piers and checking the stability of the temporary support structure;

[0016] Step 2: Move the crane to the construction area on one side of the existing line; at the same time, the crane boom is erected;

[0017] Step 3: prefabricate the steel beams between the two piers in sections and blocks and transport them to the construction area;

[0018] Step 4: Install the lifting device on the steel beam block and test lift it, and adjust the crane to the best lifting position;

[0019] Step 5: hoist each steel beam segment onto the temporary support structure and bracket structure in turn and initially fix them in place; the position of the crane is adjusted in real time according to the hoisted steel beam segment;

[0020] Step 6: After all the steel beam sections have been hoisted and their positions have been verified, they are welded and fixed, and the two outermost steel beam sections are welded and fixed to the completed steel beams;

[0021] Step 7: Remove the lifting rigging, withdraw the boom, and move the crane to the construction site of the next steel beam section;

[0022] Step 8: Remove the temporary support structure and bracket structure.

[0023] According to the above plan, in step five, the lifting of each steel beam section is rapid as follows: along the length direction of the steel beam, each steel beam section is lifted in sequence according to the principle of first the middle and then the two sides; along the width direction of the steel beam, the middle section of the same steel beam section is divided into sections, and the section on one side of the crane is lifted first, and the same section is lifted in sequence according to the principle of first the middle and then the two sides.

[0024] The beneficial effects of the present invention are as follows: the temporary support structure and steel beam construction method of the present invention can complete the hoisting of steel beams across existing lines without hindering the normal passage of existing lines. This method of directly hoisting in pieces by a crane makes up for the shortcomings and limitations of the traditional jacking method; and the present invention is also suitable for situations where the entire steel beam is overweight and cannot be hoisted as a whole but can only be hoisted in pieces, and situations where the steel beam to be constructed is located on a circular curve with a relatively large radius and arc line shape; the temporary support structure of the present invention has high overall performance, strong stability, safety and reliability, and is convenient and quick to erect and disassemble, and has a fast construction speed; the temporary support structure is made of highly versatile materials such as steel pipe columns, channel steels, I-beams, and self-made simple beams, with low cost, and the materials can be reused after disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the positions of the temporary support structure and the existing line in a specific embodiment of the present invention.

[0026] Figure 2 This is an overall schematic diagram of the temporary support structure.

[0027] Figure 3Schematic diagram of the leg structure in this embodiment.

[0028] Figure 4 Schematic diagram of the connection between the leg structure and the overlapping structure in this embodiment.

[0029] Figure 5 Schematic diagram of the structure of the vertical pole cross brace in this embodiment.

[0030] Figure 6 Schematic diagram of the structure of the longitudinal rod in this embodiment.

[0031] Figure 7 This is a schematic diagram of the positions of the existing lines and the steel beams to be constructed in this embodiment.

[0032] Figure 8 This is a schematic diagram of the steel beam sections between the two piers in this embodiment.

[0033] Fig. 9 It is a block diagram of the steel beam section A in this embodiment.

[0034] Fig.10 The crane position diagram for hoisting each piece in the steel beam block A partition in this embodiment is shown in FIG. Figure 1 (Left zone).

[0035] Fig.11 The crane position diagram for hoisting each piece in the steel beam block A partition in this embodiment is shown in FIG. Figure 2 (Right zone).

[0036] Fig.12 This is a schematic diagram of the position of the crane when hoisting the steel beam section A in this embodiment.

[0037] Fig.13 This is a schematic diagram of the position of the crane when hoisting the steel beam section B in this embodiment.

[0038] Fig.14 Schematic diagram of the position of the steel beam section C and the steel beam section D when the crane is hoisting in this embodiment.

[0039] Fig.15 This is a schematic diagram of the positions of steel beam sections E and F when the crane is hoisting them in this embodiment.

[0040] Among them: 1. Existing lines; 2. Temporary supporting structure; 3. Support system; 4. Crossbeam; 5. Longitudinal beam; 6. Support cross brace; 7. Short rod; 8. Pad; 9. Vertical pole; 10. Vertical pole cross brace; 11 Pre-buried base; 12. Vertical stiffening plate; 13. Triangular rib plate; 14. Connecting rod; 15. End connecting plate; 16. Longitudinal beam stiffening rib; 17. Longitudinal beam partition; 18. Longitudinal beam connecting plate; 19. Longitudinal beam web; 20. Longitudinal beam panel; 21. Pier; 22. Support structure; 23. Crane; 24. Completed steel beam. DETAILED DESCRIPTION

[0041] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] like Figure 1 and Figure 2 A temporary support structure for steel beams across an existing line is shown, comprising two sets of support systems and a supporting frame; the two sets of support systems are symmetrically arranged on both sides of the existing line, and the lower ends of the support systems are arranged on the ground; the supporting frame spans the existing line and is installed on the two support systems; the steel beams to be installed are hoisted in sections on the supporting frame.

[0043] Preferably, the support frame is a stable frame structure formed by connecting a plurality of horizontal beams arranged at equal intervals in the horizontal direction and a plurality of longitudinal beams arranged at equal intervals in the longitudinal direction. Figure 6 As shown, the longitudinal beam includes a longitudinal beam body, a longitudinal beam panel and a longitudinal beam web, the longitudinal beam panel is fixed to the upper surface and the lower surface of the longitudinal beam body, and the longitudinal beam web is fixed to the two outer side surfaces of the longitudinal beam body; the longitudinal beam body includes a plurality of longitudinal beam partitions arranged at intervals along the length direction of the longitudinal beam, and a plurality of longitudinal beam reinforcing ribs; the longitudinal beam partition is a frame-type structure, and the longitudinal beam partition is provided with mounting holes that match the number and position of the longitudinal beam reinforcing ribs; the longitudinal beam reinforcing ribs pass through the mounting holes at the corresponding positions of all the longitudinal beam partitions in sequence, and the longitudinal beam partitions and the longitudinal beam reinforcing ribs together form the longitudinal beam main body structure.

[0044] Preferably, each support system comprises a plurality of leg structures installed at intervals along the length direction of the existing line, such as Figure 4 As shown, each leg structure includes an embedded base, a plurality of vertical poles and an overlapping structure. The lower ends of all vertical poles are fixedly connected to the embedded base, and the upper ends of all vertical poles are connected to the overlapping structure. A plurality of vertical pole cross braces are installed at intervals along the axial direction between two adjacent vertical poles. Both sides of the support bracket are respectively fixed on the overlapping structure.

[0045] Preferably, a horizontal pad is installed at the upper end of the vertical pole, and the outer edge of the pad extends radially outward; a plurality of triangular ribs arranged at intervals along the circumferential direction are provided between the extended section of the pad and the outer wall of the vertical pole. Figure 5 As shown, the lap joint structure includes two parallel short rods and a support cross brace fixed to the upper parts of the two connecting rods; the connecting rod is fixed to a pad connecting the upper ends of the vertical rods in the same column / row, and a plurality of vertical stiffening plates are arranged on both sides of the support cross brace; the support bracket is fixed to the support cross brace.

[0046] In this embodiment, three cross beams and three longitudinal beams are provided, wherein the longitudinal beams are arranged at intervals along the width direction of the existing line, and the cross beams are arranged at intervals along the length direction of the existing line. When the existing line is wider, the required longitudinal beams are longer, and the two longitudinal beams can be bolted together into one by connecting plates. The cross beam is an H-shaped steel. Each support system includes three leg structures installed at intervals along the length direction of the existing line, and the embedded base of each leg structure is provided with four vertical poles arranged in two rows and two columns, and the upper end of the vertical pole is fixed with a lap joint structure; three groups of vertical pole cross braces are arranged at intervals between the two vertical poles along the axis direction of the vertical pole, and the two ends of the vertical pole cross brace are respectively connected to the two vertical poles, and the length direction of the vertical pole cross brace is perpendicular to the axis direction of the vertical pole. The vertical pole is made of spiral steel pipe; the connecting rod is a channel steel, and the short rod is an I-beam. The vertical pole cross brace includes a connecting rod and end connecting plates at both ends of the connecting rod, and the connecting rod is connected to the outer wall of the vertical pole through the end connecting plates.

[0047] During the steel beam construction, the steel beam between two piers is usually long and can be hoisted in sections and blocks. When the steel beam section is located in an obstacle-free area, conventional methods can be used for construction; when the steel beam section is located above an existing line, the following method is used for construction. In the present invention, two piers are located on both sides of the existing line.

[0048] A method for constructing a steel beam section across an existing line comprises the following steps:

[0049] Step 1: Set up a support structure between the two piers: After the steel beams outside the two steel beam piers are hoisted, an auxiliary support structure is set up in the non-existing line area according to the conventional method, and a temporary support structure as described above is set up in the existing line area. The temporary support structure is required not to hinder the normal use of the existing line, but to meet the construction requirements of the steel beam section to be constructed above the existing line;

[0050] Step 2: Move the crane to one side of the existing line; at the same time, the crane's boom is erected and the crane's turning radius is checked;

[0051] Step 3: Prefabricate the steel beam between the two piers in sections and blocks and transport them to the construction area: In this embodiment, a number of steel beam sections need to be constructed above the existing line. Since the steel beam sections are relatively wide, each steel beam section is prefabricated in multiple blocks along the width direction of the steel beam and then transported to the construction site;

[0052] Step 4: Install the lifting device on the steel beam block and test lift it, and adjust the crane to the best lifting position;

[0053] Step 5: hoist each steel beam section onto the temporary support structure and bracket structure in turn and initially fix them in place. The position of the crane is adjusted in real time according to the hoisted steel beam section: along the length direction of the steel beam, each steel beam section is hoisted in turn according to the principle of first the middle and then the two sides; along the width direction of the steel beam, the middle section of the same steel beam section is divided into sections, and the section on one side of the crane is hoisted first, and the sections in the same section are hoisted in turn according to the principle of first the middle and then the two sides;

[0054] Step 6: After all the steel beam sections have been hoisted and their positions have been verified, they are welded and fixed, and the two outermost steel beam sections are welded and fixed to the completed steel beams;

[0055] Step 7: Remove the lifting rigging, withdraw the boom, and move the crane to the construction site of the next steel beam section;

[0056] Step 8: Remove the temporary support structure and bracket structure.

[0057] The construction method of the present invention is applicable to steel beams with different curvatures.

[0058] Example: As shown in Figure 7, for the installation and erection of the viaduct bridge of the ring line interchange hub, the required steel beam sections are all located on a circular curve with a relatively large radius and arc line shape, and the top and bottom plates of the steel box beam have a two-way horizontal slope, and the facade has a large longitudinal slope and is on a convex vertical curve with a large radius. The steel frame bridge spans over the existing line; Figure 8 As shown, piers for supporting steel beams are provided on both sides of the existing line, and a support system for auxiliary support is set up by traditional methods; the steel beam between the two groups of piers is divided into 6 axially symmetrical steel beam sections, represented by A, B, C, D, E, and F respectively. The middle steel beam section A and steel beam section B are located above the existing line and supported by the temporary support structure of the present invention; steel beam section C and steel beam section D are arranged between the temporary support structure and the support system, and are jointly supported by the temporary support structure and the support system; steel beam section E and steel beam section F are arranged between the support system and the piers, and are jointly supported by the support system and the piers. The steel beams with larger width are prefabricated in pieces. Taking steel beam section A as an example, steel beam section A is divided into seven blocks, namely A1, A2, A3, A4, A5, A6, and A7, along the width of the steel beam. The steel beam blocks in the same partition are hoisted according to the principle of first the middle and then the two sides. If there are gas pipelines in the construction area, they should be constructed as required. The specific construction method of the steel beam between two groups of piers, which spans the existing line, includes the following steps:

[0059] Step 1: Set up a support structure between two piers and check the stability of the temporary support structure: After the steel beams outside the two steel beam piers are hoisted, an auxiliary support structure is set up in the non-existing line area according to the conventional method, and a temporary support structure as described above is set up in the existing line area. It is required that the temporary support structure does not hinder the normal use of the existing line and can meet the construction requirements of the steel beam section to be constructed above the existing line;

[0060] Step 2: Move the crane to one side of the existing line; at the same time, the crane's boom is erected and the crane's turning radius is checked;

[0061] Step 3: The steel beam between the two piers is divided into six sections along the bridge direction: A, B, C, D, E, and F. Figure 8 As shown, each steel beam segment is divided into seven parts along the transverse direction of the beam. For example, steel beam segment A is divided into seven parts A1, A2, A3, A4, A5, A6, and A7 along the transverse direction of the bridge. Fig. 9 As mentioned above, the blocks are prefabricated and transported to the construction area:

[0062] Step 4: Install the lifting device on the steel beam block and test lift it, and adjust the crane to the best lifting position;

[0063] Step 5. Lift each steel beam segment onto the temporary support structure and the bracket structure in turn and initially fix them in place. The position of the crane is adjusted in real time according to the steel beam segment being hoisted: along the length direction of the steel beam, each steel beam segment is hoisted in turn according to the principle of first the middle and then the two sides; along the width direction of the steel beam, they are hoisted in turn according to the principle of first the middle and then the two sides. Specifically, taking steel beam segment A as an example, steel beam blocks A1, A2, and A3 are in the same area, and steel beam blocks A4, A5, A6, and A7 are in the same area. First, use a crane to lift steel beam blocks A3, A2, A1, A4, A5, A6, and A7 in turn to complete the lifting and initial fixation of steel beam segment A. When lifting steel beam blocks A3, A2, and A1, the position of the crane is as follows: Fig.10 As shown, the crane position when hoisting steel beam blocks A4, A5, A6, and A7 is as follows Fig.11 As shown; then, steel beam segments A, B, D, F, C, and E are hoisted in sequence according to the above method and initially fixed. The schematic diagram of the position of the crane when hoisting each steel beam segment is as shown in Figures 12 to 15 As shown;

[0064] Step 6: After all the steel beam sections have been hoisted and their positions have been verified, they are welded and fixed, and the two outermost steel beam sections are welded and fixed to the completed steel beams;

[0065] Step 7: Remove the lifting rigging, withdraw the boom, and move the crane to the construction site of the next steel beam section;

[0066] Step 8: Remove the temporary support structure and bracket structure.

[0067] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for constructing a steel beam section across an existing line, characterized in that: The following steps are involved: Step 1: Set up a temporary support structure between two piers and check the stability of the temporary support structure; the temporary support structure includes two sets of support systems and a support frame; the two sets of support systems are symmetrically arranged on both sides of the existing line, and the lower ends of the support systems are arranged on the ground; the support frame spans the existing line and is installed on the two support systems; the steel beams to be installed are hoisted on the support frame in sections; the support frame is a stable frame structure formed by connecting a number of horizontal beams arranged at equal intervals and a number of longitudinal beams arranged at equal intervals; Step 2: Move the crane to the construction area on one side of the existing line; at the same time, the crane boom is erected; Step 3: prefabricate the steel beams between the two piers in sections and blocks and transport them to the construction area; Step 4: Install the lifting device on the steel beam block and test lift it, and adjust the crane to the best lifting position; Step 5: hoist each steel beam segment onto the temporary support structure and bracket structure in turn and initially fix them in place; the position of the crane is adjusted in real time according to the hoisted steel beam segment; Step 6: After all the steel beam sections have been hoisted and their positions have been verified, they are welded and fixed, and the two outermost steel beam sections are welded and fixed to the completed steel beams; Step 7: Remove the lifting rigging, withdraw the boom, and move the crane to the construction site of the next steel beam section; Step 8: Dismantle temporary support structures and bracket structures; The order of hoisting of each steel beam section is as follows: along the length direction of the steel beam, each steel beam section is hoisted in sequence according to the principle of first the middle and then the two sides; along the width direction of the steel beam, the middle section of the same steel beam section is divided into sections, and the section on one side of the crane is hoisted first, and within the same section, the sections are hoisted in sequence according to the principle of first the middle and then the two sides; There are three cross beams and three longitudinal beams, wherein the longitudinal beams are arranged at intervals along the width direction of the existing line, and the cross beams are arranged at intervals along the length direction of the existing line; Each support system includes a plurality of leg structures installed at intervals along the length direction of the existing line, each leg structure includes a pre-buried base, a plurality of vertical poles and a lap joint structure, the lower ends of all vertical poles are fixedly connected to the pre-buried base, and the upper ends of all vertical poles are connected to the lap joint structure; The lap joint structure includes two parallel short rods and a support cross brace fixed to the upper parts of the two connecting rods; the connecting rod is fixed to a pad connecting the upper ends of the vertical rods in the same row / line, and a plurality of vertical stiffening plates are arranged on both sides of the support cross brace; the support bracket is fixed to the support cross brace.

2. The method for constructing a steel beam section across an existing line as claimed in claim 1, characterized in that: The longitudinal beam comprises a longitudinal beam body, a longitudinal beam panel and a longitudinal beam web. The longitudinal beam panel is fixed to the upper surface and the lower surface of the longitudinal beam body, and the longitudinal beam web is fixed to the two outer side surfaces of the longitudinal beam body.

3. The method for constructing a steel beam section across an existing line as claimed in claim 2, characterized in that: The longitudinal beam body includes a plurality of longitudinal beam partitions arranged at intervals along the length direction of the longitudinal beam, and a plurality of longitudinal beam reinforcing ribs; the longitudinal beam partitions are frame-type structures, and mounting holes matching the number of longitudinal beam reinforcing ribs are arranged at intervals along the axis on the longitudinal beam partitions; the longitudinal beam reinforcing ribs pass through the mounting holes at corresponding positions of all longitudinal beam partitions in sequence, and the longitudinal beam partitions and the longitudinal beam reinforcing ribs together form the longitudinal beam body structure.

4. The temporary steel beam support structure across an existing line as claimed in claim 1, characterized in that: A plurality of vertical pole cross braces are installed at intervals between two adjacent vertical poles along the axial direction; and both sides of the support bracket are respectively fixed on the overlap structure.

5. The temporary steel beam support structure across an existing line as claimed in claim 1, characterized in that: A horizontal pad is installed on the upper end of the vertical pole, and the outer edge of the pad extends radially outward; a plurality of triangular ribs arranged at intervals along the circumferential direction are arranged between the extended section of the pad and the outer wall of the vertical pole.

Images