Construction method of fabricated square steel tube lightweight ultra-high performance concrete woven arch

Abstract

The invention relates to a construction method of a fabricated square steel tube lightweight ultra-high performance concrete woven arch, and belongs to the technical field of bridge construction, and the construction method comprises the following steps: S1, preparing a bridge member by using lightweight steel tubes and ultra-high performance concrete; s2, building a three-section arch group; s4, constructing a four-section arch group; s5, the step S3 and the step S4 are repeated in the arrangement direction of the cross braces, and the third-section arch groups and the fourth-section arch groups are arranged in a staggered mode till only closure sections are left on the whole arch frame; s6, closure is carried out; s7, standing for 3-5 days, observing an arch frame, and removing fixed safety measures; s8, after construction is completed, completion acceptance is conducted, the flatness of the bridge, joint smoothness and maintenance measures are checked, all structures of the bridge are modularized, assembly type components are manufactured, and the labor cost is reduced on the basis of accelerating bridge construction engineering through the mortise and tenon joint lap joint technology; and meanwhile, damaged parts of the bridge can be directly replaced by existing brand-new components in later maintenance, so that the maintenance cost is greatly reduced, and cost reduction and benefit improvement are realized.

Description

Technical Field

[0001] This application relates to the technical field of bridge construction, and in particular to a construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch. Background Technology

[0002] The high cost of existing bridge construction is primarily due to the following reasons: 1. The core materials for bridges, such as steel and concrete, rely on large-scale procurement, and their market prices fluctuate wildly due to the supply and demand of resources, which increases the cost of bridge construction. 2. The initial stage of bridge construction requires complex geological surveys, environmental assessments and design optimizations. In the later stages of construction, extreme weather and material shortages may cause on-site work stoppages due to material shortages. This will not only extend the bridge construction period but also increase labor costs, especially in urban core areas, further exacerbating cost pressures. 3. After bridge construction, issues such as steel corrosion and concrete cracking require maintenance. Modern bridges also need upgraded intelligent monitoring systems, coupled with the labor costs of professional maintenance teams, making annual maintenance expenses a long-term burden on local finances. Summary of the Invention

[0003] In order to shorten the bridge construction cycle, facilitate later maintenance, and reduce labor and maintenance costs, this invention application provides a construction method for prefabricated square steel tube lightweight ultra-high performance concrete woven arch.

[0004] The present invention provides a construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch, which adopts the following technical solution: A construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch includes the following steps: S1. Initial Preparations Data on soil, temperature, and humidity in the local environment were collected to determine the mix proportions of the concrete used to prepare the bridge components, which consist of lightweight steel pipes and ultra-high performance concrete. S2. Construct the three-section arch assembly. The three-section arch assembly includes side rib 1, side rib 2, and crossbeam 3; First, fix one end of the side rib 1 to the left bank abutment 13 and place the other end on the first middle cross brace 4, and adjust the angle; Then, one end of the side rib 2 is fixed to the right bank abutment 14 and the other end is placed on the second middle cross brace 5, and the angle is adjusted to be symmetrically inclined with the side rib 1. Finally, the crossbeam 3 is placed horizontally between the side ribs 1 and 2, and the tenons at both ends of the crossbeam 3 are inserted into the mortises at the end faces of the side ribs 1 and 2 respectively. S4. Construct the four-section arch assembly. The four-section arch assembly includes lower rib 6, upper rib 7, lower rib 8, and upper rib 9; First, fix one end of the lower rib 6 to the left bank bridge abutment 13 and place the other end on the first lower horizontal support 10. Place one end of the upper rib 7 with a tenon on the first lower horizontal support 10 and insert it into the tenon groove of the lower rib 6. Place one end of the upper rib 7 with a tenon groove on the top horizontal support 11. Adjust the engagement of the first middle cross brace 4 with the upper side rib 7, the first lower cross brace 10 with the side rib 1, and the top cross brace 11 with the crossbeam 3; Then, one end of the lower rib 8 is fixed to the right bank abutment 14 and the other end is placed on the second lower cross brace 12. One end of the upper rib 9 with a tenon is placed on the second lower cross brace 12 and engages with the tenon of the lower rib 8. One end of the upper rib 9 with a tenon is placed on the top cross brace 11 and inserted into the tenon of the upper rib 7. Adjust the engagement of the second middle horizontal brace 5 with the upper side rib 9 and the engagement of the second lower horizontal brace 12 with the side rib 2; S5. Repeat steps S3 and S4 along the direction of the horizontal bracing, with the three-section arch group and the four-section arch group arranged alternately until only the closure section remains of the entire arch frame. S6, Perform closure. Prefabricate 1-2 closure arch ribs in advance, and process the tenons at both ends of the closure arch ribs into wedge shapes; First, the construction workers stand on the installed arch frame and adjust the angle of the arch frames on both sides to ensure that the tenon and mortise joints at the closure point are aligned. Next, use a winch to lift the closure arch rib, insert one end into the tenon of the left bank arch frame, and then use a hammer to tap the other end through the cotton cloth so that it slowly embeds into the tenon of the right bank arch frame. S7. After the bridge is closed, let it stand for 3-5 days to observe whether the arch frame is deformed. After confirming that it is stable, remove the fixing safety measures in batches from the middle to both banks to complete the bridge construction. S8. After construction is completed, a final acceptance inspection will be conducted to check the flatness of the bridge, the smoothness of the joints, and the subsequent maintenance measures.

[0005] Optionally, the entire arch frame is constructed in four sections along both sides of the river flow direction.

[0006] Optionally, the inclination angles of the tenons and mortises of different side ribs are different. The mortises are through slots opened in the vertical direction and passing through the side ribs. After the tenons of two adjacent side ribs are engaged with the mortises, they are fixed by metal bolts, and the end faces of two adjacent side ribs fit together.

[0007] Optionally, five triangular gaps are formed between the three-section arch group and the four-section arch group, and the cross brace is located within the triangular gap. The cross brace has a groove on its periphery that engages with the side ribs, so that each cross brace engages with the side ribs in the three-section arch group and the four-section arch group simultaneously.

[0008] Optionally, in step S7, if there is a gap of ≤2mm after closure, metal bolts are used to reinforce and reduce the gap; if the gap is >3mm, the tenons of the closure arch ribs need to be ground on-site until they are tightly interlocked.

[0009] Optionally, in step S8, when a damaged internal component of the bridge needs to be replaced, the specific steps are as follows: First, support structures are erected. Temporary supports are built below the mortise and tenon joints at both ends of the component to be replaced, using wood or light steel structures. Then, the load was transferred, and the mortise and tenon joints of the damaged component were lifted with jacks to remove it from its original stress state. At the same time, testing methods were used to confirm that the deformation and torsion were within the allowable range. The damaged component was then removed from its original position using tools such as crowbars, and then slowly removed using lifting equipment.

[0010] Finally, the prefabricated components are installed using mortise and tenon joints. Instruments such as laser positioning devices are used to ensure that the position and angle are correct. After installation, the metal bolts are restored, and then the brackets and other maintenance tools made in the first step are removed.

[0011] In summary, this application includes at least one of the following beneficial technical effects of the prefabricated square steel tube lightweight ultra-high performance concrete woven arch construction method: 1. The components used in bridge construction are made of lightweight steel pipes and ultra-high performance concrete, which are more durable and have higher compressive strength than traditional cast steel. The pre-made components are pre-sized and then assembled, which improves the situation of work stoppages caused by extreme weather and material shortages in traditional bridge construction. It can speed up the construction efficiency and shorten the construction period. When components are damaged, they can be replaced for maintenance, simplifying the difficulty of later maintenance and reducing labor and maintenance costs. 2. Referring to the mortise and tenon joint method of ancient Chinese woven arches, five triangular gaps are formed between the three-section arch group and the four-section arch group. The cross braces are located in the triangular gaps. Each cross brace simultaneously engages with the side ribs in the three-section arch group and the four-section arch group, thereby improving the structural strength and compressive strength between the bridge components. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the prefabricated square steel tube lightweight ultra-high performance concrete woven arch construction method of this application.

[0013] Figure 2 This is a schematic diagram of the connection of the side ribs in the embodiments of this application.

[0014] Figure 3 This is a schematic diagram of the cross brace structure in an embodiment of this application.

[0015] In the diagram: Side rib 1; Side rib 2; Crossbeam 3; First middle cross brace 4; Second middle cross brace 5; Lower side rib 6; Upper side rib 7; Lower side rib 8; Upper side rib 9; First lower cross brace 10; Top cross brace 11; Second lower cross brace 12; Left bank abutment 13; Right bank abutment 14. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0017] This application discloses a construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch. (Refer to...) Figure 1-3 This includes the following steps; S1. Initial Preparations Data on soil, temperature, and humidity in the local environment were collected to determine the mix proportions of the concrete used to prepare the bridge components, which consist of lightweight steel pipes and ultra-high performance concrete. Bridge components include side ribs, cross braces, and closure arch ribs.

[0018] S2. Construct the three-section arch assembly. The three-section arch assembly includes side rib 1, side rib 2, and crossbeam 3; First, fix one end of the side rib 1 to the left bank abutment 13 and place the other end on the first middle horizontal brace 4, and adjust the angle; Then, one end of the side rib 2 is fixed to the right bank abutment 14 and the other end is placed on the second middle cross brace 5, and the angle is adjusted to be symmetrically inclined with the side rib 1. Finally, the crossbeam 3 is placed horizontally between the side ribs 1 and 2, and the tenons at both ends of the crossbeam 3 are inserted into the mortises at the end faces of the side ribs 1 and 2, respectively.

[0019] S4. Construct the four-section arch assembly. The four-section arch assembly includes lower rib 6, upper rib 7, lower rib 8, and upper rib 9; First, fix one end of the lower rib 6 to the left bank bridge abutment 13 and place the other end on the first lower horizontal support 10. Place one end of the upper rib 7 with a tenon on the first lower horizontal support 10 and insert it into the tenon groove of the lower rib 6. Place one end of the upper rib 7 with a tenon groove on the top horizontal support 11. Adjust the engagement of the first middle horizontal brace 4 with the upper side rib 7, the first lower horizontal brace 10 with the side rib 1, and the top horizontal brace 11 with the crossbeam 3; Then, one end of the lower rib 8 is fixed to the right bank abutment 14 and the other end is placed on the second lower cross brace 12. One end of the upper rib 9 with a tenon is placed on the second lower cross brace 12 and engages with the tenon of the lower rib 8. One end of the upper rib 9 with a tenon is placed on the top cross brace 11 and inserted into the tenon of the upper rib 7. Adjust the engagement of the second middle horizontal brace 5 with the upper side rib 9 and the engagement of the second lower horizontal brace 12 with the side rib 2.

[0020] S5. Repeat steps S3 and S4 along the direction of the horizontal bracing, with the three-section arch group and the four-section arch group arranged alternately until only the closure section remains of the entire arch frame. S6, Perform closure. Prefabricate 1-2 closure arch ribs in advance, and process the tenons at both ends of the closure arch ribs into wedge shapes; First, the construction workers stand on the installed arch frame and adjust the angle of the arch frames on both sides to ensure that the tenon and mortise joints at the closure point are aligned. Next, use a winch to lift the closure arch rib, insert one end into the tenon of the left bank arch frame, and then use a hammer to tap the other end through the cotton cloth so that it slowly embeds into the tenon of the right bank arch frame. If there is a gap of ≤2mm after the closure, use metal bolts to reinforce and reduce the gap; if the gap is >3mm, the tenons of the closure arch ribs need to be ground on site until they are tightly interlocked.

[0021] S7. After the bridge is closed, let it stand for 3-5 days to observe whether the arch frame is deformed. After confirming that it is stable, remove the fixing safety measures in batches from the middle to both banks to complete the bridge construction.

[0022] like Figure 1 As shown, the entire arch frame is constructed in four sections along both sides of the river's flow direction.

[0023] like Figure 1 and 2 As shown, the inclination angles of the tenons and mortises of different side ribs are different. The mortises are through slots opened in the vertical direction and passing through the side ribs. The tenons of two adjacent side ribs are engaged with the mortises and fixed by metal bolts. The end faces of two adjacent side ribs fit together.

[0024] like Figure 3 As shown, five triangular gaps are formed between the three-section arch group and the four-section arch group. The cross braces are located within the triangular gaps. The periphery of the cross braces is provided with slots that engage with the side ribs, so that each cross brace engages with the side ribs in the three-section arch group and the four-section arch group at the same time, thereby further improving the structural stability of the arch frame.

[0025] S8. After construction is completed, a final acceptance inspection will be conducted to check the flatness of the bridge, the smoothness of the joints, etc., and basic maintenance measures such as personnel patrols will be carried out in the later stage.

[0026] When structural damage is discovered, existing technologies require significant material and human resources. However, this invention allows for the direct prefabrication of entirely new lightweight steel pipe ultra-high-performance concrete components in a factory, enabling replacement with these new components and saving time and manpower. The specific steps are as follows: First, support structures are erected. Temporary supports are built below the mortise and tenon joints at both ends of the component to be replaced, using wood or light steel structures, to prevent collapse.

[0027] Then, the load was transferred by using jacks to lift the mortise and tenon joints of the damaged component, so that it was removed from its original stress state. At the same time, testing methods were used to confirm that the deformation and torsion were within the allowable range.

[0028] Then, use tools such as crowbars to remove the damaged components from their original positions. If there is rust or other damage at the contact points, it should be repaired as well. Afterward, use lifting equipment such as cranes to slowly remove the damaged components to prevent secondary damage to other components.

[0029] Finally, the prefabricated components are installed using mortise and tenon joints. Instruments such as laser positioning devices are used to ensure that the position and angle are correct. After installation, the metal bolts are restored, and then the brackets and other maintenance tools made in the first step are removed.

[0030] Compared with existing construction technologies, this invention has the advantages of low construction cost, short construction period, high construction efficiency, and strong adaptability, as detailed below: 1. Cost control Traditional construction techniques are costly and difficult to reduce during the construction process, and most of them are for rigid requirements. In contrast, the modular construction method of this invention can be carried out in an assembly line manner, ensuring project quality while reducing costs.

[0031] 2. Shortened cycle Existing projects typically have long construction cycles, ranging from several months to several years, while this invention can significantly shorten construction time through construction technology and modular construction.

[0032] 3. Reduced maintenance costs This invention utilizes modular components and employs mortise and tenon joints combined with metal bolts to complete bridge construction. In later operation and maintenance, damaged components can be directly replaced to reduce time and manpower consumption.

[0033] 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 construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch, characterized in that, Includes the following steps: S1. Initial Preparations Data on soil, temperature, and humidity in the local environment were collected to determine the mix proportions of the concrete used to prepare the bridge components, which consist of lightweight steel pipes and ultra-high performance concrete. S2. Construct the three-section arch assembly. The three-section arch assembly includes side ribs (1), side ribs (2), and crossbeams (3). First, fix one end of the side rib (1) to the left bank abutment (13) and place the other end on the first middle cross brace (4), and adjust the angle; Then, one end of the side rib (2) is fixed to the right bank abutment (14) and the other end is placed on the second middle cross brace (5), and the angle is adjusted to be symmetrically inclined with the side rib (1); Finally, the crossbeam (3) is placed horizontally between the side ribs (1) and (2), and the tenons at both ends of the crossbeam (3) are inserted into the mortises at the end faces of the side ribs (1) and (2), respectively. S4. Construct the four-section arch assembly. The four-section arch assembly includes a lower rib (6), an upper rib (7), a lower rib (8), and an upper rib (9). First, fix one end of the lower rib (6) to the left bank bridge abutment (13) and place the other end on the first lower horizontal support (10). Place one end of the upper rib (7) with a tenon on the first lower horizontal support (10) and insert it into the tenon groove of the lower rib (6). Place one end of the upper rib (7) with a tenon groove on the top horizontal support (11). Adjust the engagement of the first middle cross brace (4) with the upper side rib (7), the engagement of the first lower cross brace (10) with the side rib (1), and the engagement of the top cross brace (11) with the crossbeam (3); Then, one end of the lower rib (8) is fixed to the right bank abutment (14) and the other end is placed on the second lower cross brace (12). The upper rib (9) with a tenon is placed on the second lower cross brace (12) and engaged with the tenon of the lower rib (8). The upper rib (9) with a tenon is placed on the top cross brace (11) and inserted into the tenon of the upper rib (7). Adjust the engagement of the second middle cross brace (5) with the upper side rib (9) and the engagement of the second lower cross brace 12 with the side rib (2); S5. Repeat steps S3 and S4 along the direction of the horizontal bracing, with the three-section arch group and the four-section arch group arranged alternately until only the closure section remains of the entire arch frame. S6, Perform closure. Prefabricate 1-2 closure arch ribs in advance, and process the tenons at both ends of the closure arch ribs into wedge shapes; First, the construction workers stand on the installed arch frame and adjust the angle of the arch frames on both sides to ensure that the tenon and mortise joints at the closure point are aligned. Next, use a winch to lift the closure arch rib, insert one end into the tenon of the left bank arch frame, and then use a hammer to tap the other end through the cotton cloth so that it slowly embeds into the tenon of the right bank arch frame. S7. After the bridge is closed, let it stand for 3-5 days to observe whether the arch frame is deformed. After confirming that it is stable, remove the fixing safety measures in batches from the middle to both banks to complete the bridge construction. S8. After construction is completed, a final acceptance inspection will be conducted to check the flatness of the bridge, the smoothness of the joints, and the subsequent maintenance measures.

2. The construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch according to claim 1, characterized in that: The entire arch frame is constructed in four sections along both sides of the river's flow direction.

3. The construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch according to claim 1, characterized in that: The inclination angles of the tenons and mortises of the different side ribs are different. The mortises are through slots opened in the vertical direction and passing through the side ribs. The tenons of two adjacent side ribs are engaged with the mortises and fixed by metal bolts. The end faces of two adjacent side ribs fit together.

4. The construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch according to claim 3, characterized in that: Five triangular gaps are formed between the three-section arch group and the four-section arch group. The cross brace is located in the triangular gap. The periphery of the cross brace is provided with a groove that engages with the side rib, so that each cross brace engages with the side rib in the three-section arch group and the four-section arch group at the same time.

5. The construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch according to claim 1, characterized in that: In step S7, if there is a gap of ≤2mm after closure, use metal bolts to reinforce and reduce the gap; if the gap is >3mm, the tenons of the closure arch ribs need to be ground on site until they are tightly interlocked.

6. The construction method for a prefabricated square steel tube lightweight ultra-high performance concrete woven arch according to claim 1, characterized in that: In step S8, when bridge internal components are damaged and need to be replaced, the specific steps are as follows: First, support structures are erected. Temporary supports are built below the mortise and tenon joints at both ends of the component to be replaced, using wood or light steel structures. Then, the load was transferred by using jacks to lift the mortise and tenon joints of the damaged component, so that it was removed from its original stress state. At the same time, testing methods were used to confirm that the deformation and torsion were within the allowable range. Then, tools such as crowbars were used to remove the damaged components from their original positions, and then lifting equipment was used to slowly remove the damaged components. Finally, the prefabricated components are installed using mortise and tenon joints. Instruments such as laser positioning devices are used to ensure that the position and angle are correct. After installation, the metal bolts are restored, and then the brackets and other maintenance tools made in the first step are removed.

Images