Steel trestle rapid construction method

Abstract

The application discloses a steel trestle rapid construction method, and relates to the technical field of bridge construction, which comprises the following steps: temporary steel pipe pile construction and temporary orifice platform erection, inserting and driving temporary steel pipe piles, erecting bailey; steel casing lowering and punching; installing design steel pipe piles, inserting and driving design steel pipe piles in each steel casing; pouring concrete, pulling out the steel casing after pouring the concrete; steel pipe flat connection construction; superstructure construction, sequentially comprising load-bearing beam installation, bailey beam installation, distribution beam installation and bridge deck installation, wherein, the temporary punching platform formed by laying channel steel is removed before the superstructure construction; the bailey beam installation is operated only after the final setting of the concrete in the design steel pipe pile; the construction is cooperated through the temporary steel pipe pile and the design steel pipe pile, the temporary steel pipe pile forms support and meets the strength requirement of the early construction, and part of the steps are operated in the concrete solidification process, so that the length of the downtime waiting time is reduced, and the construction is more efficient and quicker.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and more specifically, it relates to a rapid construction method for steel trestle bridges. Background Technology

[0002] A steel trestle bridge is a temporary bridge for the movement of lifting and transport machinery.

[0003] For example, Chinese patent publication number CN111851302A discloses a rapid construction method for steel trestle bridges, including the following steps: S1, firstly, using a crawler crane and vibratory hammer to drive steel pipe piles as pile foundations and piers, and welding horizontal connecting channel steel between the steel pipe piles to form a whole; S2, secondly, installing the pile top longitudinal beams, transverse beams, Bailey beams, laying transverse distribution beams and welding them firmly; S3, thirdly, laying longitudinal distribution beams, laying 10mm thick steel plates and welding them firmly to the distribution beams to form the bridge deck; S4, finally setting up guardrails and safety protection facilities.

[0004] In the above scheme, steel pipe piles are driven as supports. In actual construction, in order to enhance the support effect, concrete needs to be poured into the steel pipe piles after they are driven. Since the steel pipe piles are the main support carrier, subsequent construction requires the concrete to set. This creates a waiting time, which needs to be improved. Summary of the Invention

[0005] To improve the situation of waiting for concrete to solidify inside steel pipe piles, this application provides a method for rapid construction of steel trestle bridges.

[0006] This application provides a rapid construction method for steel trestle bridges, which adopts the following technical solution:

[0007] A rapid construction method for steel trestle bridges includes the following steps:

[0008] Temporary steel pipe pile construction and temporary borehole platform erection: driving temporary steel pipe piles, with multiple temporary steel pipe piles distributed laterally along the steel trestle; installing lower crossbeams on the temporary steel pipe piles according to the elevation of the steel trestle; erecting Bailey beams, with at least two sets of Bailey beams distributed laterally along the steel trestle.

[0009] The steel casing is lowered and perforated. Space is reserved for lowering the steel casing when erecting the Bailey bridge. The steel casing is driven in and positioned at a set distance behind the temporary steel pipe piles. Multiple steel casings are distributed laterally along the steel trestle. A hole is excavated inside each steel casing, with a perforation depth of not less than 5m.

[0010] Install the designed steel pipe piles, and drive the designed steel pipe piles into each steel casing.

[0011] Pour concrete, and then remove the steel casing after the concrete has been poured.

[0012] Steel pipe parallel connection construction;

[0013] The construction of the superstructure includes the installation of load-bearing beams, Bailey bridge beams, distribution beams, and bridge deck. Before the construction of the superstructure, the temporary punching platform formed by the laying of channel steel is removed; the installation of Bailey bridge beams is carried out only after the concrete inside the designed steel pipe piles has finally set.

[0014] Through the above technical solution, by setting up temporary steel pipe piles and design steel pipe piles, the temporary steel pipe piles, together with the lower crossbeam, support the Bailey bridge beams in the early stages of construction to bear the load. At this time, the load on the design steel pipe piles is very small, and the insertion depth of the design steel pipe piles is sufficient to achieve stable support. Only after concrete pouring is needed to proceed with subsequent work. During the concrete curing process, the removal of the steel casing, the horizontal connection of the steel pipes, and the installation of the load-bearing beams are completed. After the load-bearing beams are installed, several hours have passed before the concrete finally sets, reducing downtime and making construction more efficient and faster. The Bailey bridge beams are installed only after the concrete inside the design steel pipe piles has fully set. After the Bailey bridge beams and load-bearing beams are connected, the design steel pipe piles need to bear the loads of the Bailey bridge beams, the bridge deck, and subsequent construction equipment. Therefore, installing the Bailey bridge beams only after the concrete inside the design steel pipe piles has fully set makes the structure of the design steel pipe piles more stable. After the overall construction is completed, the concrete inside the design steel pipe piles is fully cured and further supported, in conjunction with the support of the temporary steel pipe piles, making the steel trestle bridge structurally stronger and more stable.

[0015] Optionally, the process of lowering and punching the steel casing also includes installing a guide frame, and after the guide frame is positioned, the steel casing is inserted and driven along the guide frame.

[0016] The above technical solution guides the insertion of the steel casing through a guide frame, making the positioning of the steel casing more accurate.

[0017] Optionally, the guide frame can be removed after the steel casing is pulled out.

[0018] The above technical solution guides the steel casing out of the guide frame, reducing the chance of the steel casing hitting the designed steel pipe pile.

[0019] Optionally, the construction steps for steel pipe parallel connection include:

[0020] Make horizontal connection position marks on the corresponding design steel pipe piles, and use connecting steel pipes and connecting channel steel for horizontal connection. Adjacent design steel pipe piles are connected by connecting steel pipes; the connecting channel steel is in the shape of scissors bracing, and lugs are welded to the outer wall of the design steel pipe pile. The corresponding ends of the connecting channel steel are welded or bolted to the corresponding lugs to achieve fixation.

[0021] The above technical solution makes horizontal connection more convenient by marking the position and setting lugs to connect the connecting channel steel, making the installation of the connecting channel steel more convenient.

[0022] Optionally, the steel pipe piles are designed to be distributed in multiple rows along the longitudinal direction of the steel trestle, and each steel pipe pile has an installation groove at its upper end. The installation groove runs through the corresponding steel pipe pile along the longitudinal direction of the steel trestle.

[0023] In the installation of the load-bearing beam, the load-bearing beam includes a lower load-bearing beam and an upper load-bearing beam; a bracket is welded to the outer wall of each designed steel pipe pile, and the upper end face of the bracket is flush with the bottom of the installation groove; the lower load-bearing beam includes multiple lower steel frames, the number of which is the same as the number of steel pipe piles in each row of designed steel pipe piles; each lower steel frame is simultaneously embedded into the installation grooves on two longitudinally distributed designed steel pipe piles and abuts against the upper end face of the corresponding bracket; the upper load-bearing beam extends laterally along the steel trestle and is installed above the lower load-bearing beam.

[0024] The above technical solution uses mounting grooves and brackets to support the lower load-bearing beam, making the installation structure of the lower load-bearing beam more stable.

[0025] Optionally, after the lower steel frame is installed, a node plate is welded. One end of the node plate is welded and fixed to the designed steel pipe pile, and the other end is welded and fixed to the lower steel frame.

[0026] The above technical solution strengthens the installation strength of the lower steel frame by using node plates.

[0027] Optionally, during the Bailey beam installation process, mark the exact location of the Bailey beam to be installed in the space reserved for the lowering of the steel casing, and then install the corresponding Bailey beam; weld a limiter to the upper load-bearing beam to fix the Bailey beam to the upper load-bearing beam.

[0028] The above technical solution first marks the location of the Bailey beams that were missed due to the reserved space, then follows up the marked location to install additional Bailey beams, and then uses limiters to further fix the Bailey beams, making the installation of Bailey beams more stable.

[0029] Optionally, during the bridge deck installation process, the bridge deck is made of channel steel, and all contact points between the channel steel and the distribution beam are fully welded.

[0030] The above technical solution involves full welding at the contact points between the channel steel and the distribution beam, resulting in more stable fixing.

[0031] Optionally, the following may also be included after the construction of the superstructure:

[0032] The guardrail is installed by welding and fixing the guardrail posts to the distribution beam.

[0033] The above technical solution allows the guardrail posts to be welded and fixed to the distribution beam, making the installation and positioning of the posts more convenient.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] (1) Construction is carried out by using temporary steel pipe piles in conjunction with the designed steel pipe piles. The temporary steel pipe piles form a support to meet the strength requirements of the early construction. During the concrete curing process, some steps are operated, reducing the downtime and waiting time, making the construction more efficient and faster. In addition, after the concrete in the designed steel pipe piles is completely cured, further support is provided. Combined with the support of the temporary steel pipe piles, the structural strength of the steel trestle bridge is better and more stable.

[0036] (2) By setting up a guide frame, the steel casing is inserted through the guide frame, making the positioning of the steel casing more accurate. The guide frame can also guide the steel casing to be pulled out, reducing the situation where the steel casing bumps into the designed steel pipe pile. Attached Figure Description

[0037] Figure 1 This is a schematic diagram showing the state of the steel casing after it has been lowered, as illustrated in the embodiment.

[0038] Figure 2 This is a schematic diagram illustrating the state of concrete pouring in an embodiment.

[0039] Figure 3 This is a schematic diagram showing the state of the lower load-bearing beam after installation, as shown in the embodiment.

[0040] Figure 4 This is a schematic diagram of the horizontal connection of steel pipes in an embodiment;

[0041] Figure 5 A schematic diagram of the Bailey beam after installation, as shown in the embodiment.

[0042] Figure 6 This is a schematic diagram showing the state of the distribution beam after installation, as illustrated in the embodiment.

[0043] Figure 7 for Figure 6 Enlarged diagram of section A in the middle;

[0044] Figure 8 This is a schematic diagram showing the state of the guardrail after installation, as shown in the example.

[0045] Attached reference numerals: 1. Foundation abutment; 2. Temporary steel pipe pile; 3. Lower crossbeam; 4. Bailey bridge beam; 5. Steel casing; 6. Guide frame; 7. Designed steel pipe pile; 71. Installation groove; 8. Funnel; 9. Connecting steel pipe; 10. Connecting channel steel; 11. Lug; 12. Lower load-bearing beam; 121. Lower steel frame; 13. Upper load-bearing beam; 14. Corbel; 15. Node plate; 16. Distribution beam; 17. Bridge deck; 18. Guardrail; 19. Limiter; 20. U-shaped clamp. Detailed Implementation

[0046] The present application will be further described in detail below with reference to the accompanying drawings.

[0047] This application discloses a rapid construction method for steel trestle bridges.

[0048] Example:

[0049] A rapid construction method for steel trestle bridges includes the following steps:

[0050] S1, Construction of foundation bridge abutments

[0051] See Figure 1 , and build the foundation bridge abutment 1 on one side of the riverbank.

[0052] S2, Temporary steel pipe pile construction and temporary orifice platform erection

[0053] Temporary steel pipe piles 2 are driven into the ground using a crawler crane and vibratory hammer. These temporary steel pipe piles 2 are made of steel pipes with a diameter of 820mm and a wall thickness of 10mm. Multiple temporary steel pipe piles 2 are distributed laterally along the steel trestle bridge; in this example, there are two. Lower crossbeams 3 are installed on the temporary steel pipe piles 2 according to the elevation of the steel trestle bridge. The lower crossbeams 3 extend laterally along the steel trestle bridge and are simultaneously fixed to the upper end of the corresponding temporary steel pipe pile 2. The fixing method can be welding or bolting. Bailey bridge beams 4 are then erected. At least two sets of Bailey bridge beams 4 are installed, spaced apart laterally along the steel trestle bridge. The Bailey bridge beams 4 are connected to the foundation abutment 1, specifically by welding or bolting. When installing the Bailey bridge beams 4, space must be reserved for the subsequent lowering of the steel casing 5. If the Bailey bridge beam 4 interferes with the lowering of the steel casing 5, that section of the Bailey bridge beam 4 can be temporarily omitted.

[0054] During the overall construction of the steel trestle bridge, after the first span is completed, the subsequent Bailey beams 4 must be connected to the corresponding Bailey beams 4 of the previous span. Then, a temporary punching platform is laid using channel steel, with the length of each channel steel extending laterally along the steel trestle bridge.

[0055] S3, lowering of steel casing and punching.

[0056] The steel casing 5 is located at a predetermined distance behind the temporary steel pipe pile 2. The predetermined distance is determined according to the actual situation, such as 3m, 4m, 5m, etc. In this application, "behind the temporary steel pipe pile 2" refers to the side of the corresponding temporary steel pipe pile 2 that is close to the side that has been completed; when constructing the first span, "behind the temporary steel pipe pile 2" refers to the side of the corresponding temporary steel pipe pile 2 that is close to the direction of the foundation abutment 1.

[0057] S31, Steel casing installation

[0058] The guide frame 6 is installed and fixed to the Bailey beam 4 with bolts and other fasteners. After the guide frame 6 is positioned, steel casings 5 ​​are driven into place along the guide frame 6. The steel casings 5 ​​have a diameter of 1000mm and a wall thickness of 15-25mm. They are installed using a crawler crane and a vibratory hammer, with a temporary punching platform as support. The steel casings 5 ​​are distributed in multiple rows along the longitudinal direction of the steel trestle, and multiple steel casings 5 ​​are distributed in each row along the transverse direction of the steel trestle. In this example, there are two rows of steel casings 5, with three steel casings 5 ​​in each row.

[0059] S32, punched

[0060] The drilling is carried out using an 80cm drill bit, excavating within 5 meters of the steel casing, with a drilling depth of not less than 5m.

[0061] S4, Installation of steel pipe piles

[0062] See 1 and Figure 2 The steel pipe piles 7 are driven using a crawler crane and vibratory hammer. The steel pipe piles 7 are made of steel pipes with a diameter of 820mm and a wall thickness of 10mm. Each steel pipe pile 7 is embedded one-to-one into a steel casing 5 and driven along the casing 5. During the vibratory hammer driving process, it is essential to ensure that the pile position and verticality meet the requirements. The insertion depth of the steel pipe piles 7 is greater than the insertion depth of the steel casing 5. For example, if the insertion depth of the steel casing 5 is 0.8-1m, the insertion depth of the steel pipe piles 7 is 5.5-6m.

[0063] S5, pouring concrete

[0064] A funnel 8 is installed on the upper part of the designed steel pipe pile 7. Concrete is transported into the designed steel pipe pile 7 along the funnel 8 by a concrete truck, and the concrete pouring depth is not less than 5m. After the concrete is poured, the steel casing 5 is pulled out with the help of a crawler crane. The guide frame 6 is used to remove the guide for the steel casing 5 to reduce collision between the steel casing 5 and the designed steel pipe pile 7. Then the guide frame 6 is removed.

[0065] S6, Steel Pipe Horizontal Connection Construction

[0066] See Figure 3 and Figure 4 After the construction of each row of designed steel pipe piles 7 is completed, the horizontal connection construction between the designed steel pipe piles 7 is immediately carried out. First, the horizontal connection position is marked with paint on the corresponding designed steel pipe piles 7. Connecting steel pipes 9 and connecting channel steel 10 are used for horizontal connection. Adjacent designed steel pipe piles 7 are connected by connecting steel pipes 9, with both ends of the connecting steel pipes 9 welded to the corresponding designed steel pipe piles 7. The connecting channel steel 10 is in a scissor brace shape. To facilitate the connection of the scissor brace, lugs 11 are first welded to the outer wall of the designed steel pipe piles 7. The corresponding ends of the connecting channel steel 10 are welded or bolted to the corresponding lugs 11 for fixation. In actual operation, the horizontal connection construction should be carried out when the water level is low.

[0067] S7, Superstructure Construction

[0068] Before the actual construction of the superstructure, the temporary punching platform formed by the laying of channel steel was dismantled by a crawler crane.

[0069] S71, Load-bearing beam installation

[0070] See Figure 4 and Figure 5 The load-bearing beams include an upper load-bearing beam 13 and a lower load-bearing beam 12. Each designed steel pipe pile 7 has an installation groove 71 at its upper end, which runs longitudinally through the corresponding designed steel pipe pile 7 along the steel trestle. Brackets 14 are welded to the outer wall of each designed steel pipe pile 7. Each steel pipe pile has two brackets 14, distributed one-to-one on both sides of the corresponding steel pipe pile along the longitudinal direction of the steel trestle. The upper end face of each bracket 14 is flush with the bottom of the installation groove 71. The lower load-bearing beam 12 includes multiple lower steel frames 121, the number of which is the same as the number of steel pipe piles in each row of designed steel pipe piles 7. In this example, there are three lower steel frames 121. Each lower steel frame 121 is simultaneously embedded in the installation groove 71 on two longitudinally distributed designed steel pipe piles 7, and the lower end face of the lower steel frame 121 abuts against the upper end face of the bracket 14 to enhance the support effect. Each lower steel frame 121 is made of H-beams, and each H-beam is fixed with a stiffening plate to enhance structural strength. After the lower steel frame 121 is installed, a node plate 15 is welded on. One end of the node plate 15 is welded and fixed to the designed steel pipe pile 7, and the other end is welded and fixed to the lower steel frame 121. The upper load-bearing beam 13 is made of H-beams and extends laterally along the steel trestle bridge, installed above the lower load-bearing beam 12. The upper load-bearing beam 13 is installed as a whole or in sections and then connected by electric welding to form a whole.

[0071] S72, Bailey beam installation

[0072] See Figure 6 and Figure 7 After the concrete inside the steel pipe pile 7 has fully set, measurements are taken and laid out on the upper load-bearing beam 13 to mark the exact position of the Bailey beam 4 to be installed in the space reserved for the lowering of the steel casing 5. A crawler crane is then used to install the Bailey beam 4 at the corresponding position. Then, a limiter 19 is welded on. The limiter 19 has a snap-fit ​​opening at the bottom. The snap-fit ​​opening of the limiter 19 snaps the lower part of the Bailey beam 4 and welds it to the upper load-bearing beam 13 to fix it. This fixes the Bailey beam 4 and the upper load-bearing beam 13. Adjacent Bailey beams 4 distributed laterally are connected by channel steel in the form of scissor bracing. The specific connection method can be by snap-fitting, bolt fixing or welding.

[0073] S73, Distribution beam installation

[0074] The installation is carried out using a crawler crane. The distribution beam 16 is made of I-beams, with the length of the I-beams along the transverse direction of the steel trestle. The I-beams are spaced apart and evenly distributed, and are fixed to the Bailey beam 4 using U-shaped clips 20.

[0075] S74, bridge deck installation

[0076] See Figure 8 The bridge deck 17 is made of channel steel, with the length of the channel steel running longitudinally along the steel trestle. A gap of no more than 3 cm may be left between the channel steel sections. All contact points between the channel steel of the bridge deck 17 and the distribution beam 16 must be fully welded.

[0077] S8, guardrail installation

[0078] Two guardrails 18 are provided, one on each side of the steel trestle bridge. Each guardrail 18 includes a post and a handrail. Multiple posts are provided, distributed longitudinally along the steel trestle bridge. Each post is welded and fixed to the distribution beam 16. The handrail is welded and connected to each post to form a lateral protection effect. Both the handrail and the posts are painted.

[0079] The remaining spans of the steel trestle bridge are installed by repeating steps S3 to S8 until the steel trestle bridge is completed.

[0080] The working principle of this embodiment is as follows:

[0081] Construction was coordinated with the design steel pipe piles 7 using temporary steel pipe piles 2. The temporary steel pipe piles 2 provided support, meeting the strength requirements of the initial construction phase. During the concrete curing process, the removal of the steel casing 5, the horizontal connection of the steel pipes, and the installation of the load-bearing beams were completed. After the load-bearing beams were installed, several hours had passed before the concrete finally set, reducing downtime and making the construction more efficient and faster. After the Bailey bridge 4 was connected to the load-bearing beams, the design steel pipe piles 7 needed to bear the loads of the Bailey bridge 4, the bridge deck 17, and subsequent construction equipment. Therefore, the Bailey bridge installation was only carried out after the concrete within the design steel pipe piles 7 had fully set. During use, the concrete within the design steel pipe piles 7 was fully cured before further support, combined with the support of the temporary steel pipe piles 2, resulting in better structural strength and stability of the steel trestle bridge.

[0082] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for rapid construction of a steel trestle, characterized in that: Comprising the following steps: Temporary steel pipe pile construction and temporary orifice platform erection, inserting and driving temporary steel pipe piles (2), multiple temporary steel pipe piles (2) are distributed along the steel trestle transversely; installing lower cross beams (3) on the temporary steel pipe piles (2) according to the elevation of the steel trestle, erecting bailey beams (4), at least two groups of bailey beams (4) are provided and distributed along the steel trestle transversely; Steel casing lowering and punching, reserving space for the lowering of the steel casing (5) when the bailey beam (4) is erected, inserting and driving the steel casing (5), the position of the steel casing (5) is located at a certain distance behind the temporary steel pipe pile (2); multiple steel casings (5) are distributed along the steel trestle transversely; punching and excavating in each steel casing (5), the punching depth is not less than 5m; Installing design steel pipe piles, inserting and driving design steel pipe piles (7) in each steel casing (5); Pouring concrete, pulling out the steel casing (5) after pouring the concrete; Design steel pipe pile flat connection construction; Superstructure construction, sequentially comprising bearing beam installation, bailey beam installation, distribution beam installation and bridge deck installation, wherein the temporary punching platform formed by laying channel steel is removed before the superstructure construction; the bailey beam installation is operated only after the concrete in the design steel pipe pile (7) is finally set.

2. The steel trestle rapid construction method according to claim 1, characterized by: In the step of steel casing lowering and punching, a guide frame (6) is further installed, the guide frame (6) is positioned and the steel casing (5) is inserted and driven along the guide frame (6).

3. The steel trestle rapid construction method according to claim 2, characterized by: The guide frame (6) is removed after the steel casing (5) is pulled out.

4. The steel trestle rapid construction method according to claim 1, characterized by: In the step of steel pipe flat connection construction, comprising: Making flat connection position marks on the corresponding design steel pipe piles (7), using connecting steel pipes (9) and connecting channel steel (10) for flat connection, adjacent design steel pipe piles (7) are connected through connecting steel pipes (9); the connecting channel steel (10) is in the shape of a scissors support, the connecting channel steel (10) is welded or bolted to the corresponding lug (11) to realize fixation, the lug (11) is welded on the outer wall of the design steel pipe pile (7).

5. The steel trestle rapid construction method according to claim 1, characterized by: Multiple rows of design steel pipe piles (7) are distributed along the steel trestle longitudinally, each design steel pipe pile (7) has an installation groove (71) at the upper end, the installation groove (71) penetrates through the corresponding design steel pipe pile (7) along the steel trestle longitudinally; In the step of bearing beam installation, the bearing beam comprises lower bearing beams (12) and upper bearing beams (13); brackets (14) are welded on the outer wall of each design steel pipe pile (7), the upper end surface of the bracket (14) is flush with the groove bottom of the installation groove (71); the lower bearing beam (12) comprises multiple lower steel frames (121), the number of the lower steel frames (121) is the same as the number of the steel pipe piles in each row of design steel pipe piles (7); each lower steel frame (121) is simultaneously embedded in the installation grooves (71) on the two design steel pipe piles (7) distributed longitudinally and abuts against the upper end surface of the corresponding bracket (14); the upper bearing beam (13) is installed above the lower bearing beam (12) along the steel trestle transversely.

6. The steel trestle rapid construction method according to claim 5, characterized by: After the lower steel frame (121) is installed, a node plate (15) is welded, one end of the node plate (15) is welded and fixed with the design steel pipe pile (7), the other end is welded and fixed with the lower steel frame (121).

7. The steel trestle rapid construction method according to claim 5, characterized by: In the step of installing the bailey beam, the exact position of the bailey beam (4) to be installed at the space where the reserved steel casing (5) is lowered is marked, and then the corresponding bailey beam (4) is installed; the position limiter (19) is welded on the upper bearing beam (13), and the bailey beam (4) is fixed with the upper bearing beam (13) through the position limiter (19).

8. The steel trestle rapid construction method according to claim 5, characterized by: In the step of installing the bridge deck, the bridge deck (17) adopts channel steel, and the contact points between the channel steel of the bridge deck (17) and the distribution beam (16) are fully welded.

9. The steel trestle rapid construction method according to claim 1, characterized by: After the superstructure construction, it further includes: Guardrail installation, the vertical rod of the guardrail (18) is welded and fixed on the distribution beam (16).

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