Buckling and hanging system for hoisting steep cliff arch bridge

Abstract

The utility model provides a buckle hanging system used for steep cliff wall arch bridge hoisting, the buckle hanging system comprises a vertical pile foundation, a bearing platform, anchor cables and a buckle cable, the anchor cables and the buckle cable are arranged on the bearing platform in a penetrating mode, the buckle cable is located in the middle of the bearing platform, and the anchor cables are symmetrically distributed on the two sides of the buckle cable; the bearing platform is connected with a plurality of vertical pile foundations. The steep cliff arch bridge supporting structure has the advantages of being suitable for various steep cliff arch bridges, reasonably utilizing topographic conditions, reducing excavation of mountains, reducing construction difficulty, shortening construction period and being capable of remarkably saving cost.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, specifically to a fastening system for hoisting arch bridges on steep cliffs. Background Technology

[0002] When erecting steel truss arch bridges, a cable-stayed system is often used to assist in the installation of anchor cables. After installing several sections of the arch rib, a set of anchor cables is tensioned, and this process is repeated until the arch rib is closed. Currently, commonly used anchor systems are divided into tower-type ground anchors and one-sided towerless stepped hollow anchors, both of which have corresponding problems: (1) The anchor tower occupies a large area, and for steep slopes, construction is difficult, time-consuming, and consumes a large amount of steel; (2) The stepped hollow anchor has high requirements for the quality of the mountain rock, and the mountain needs a lot of trenching and blasting, which is costly and difficult to construct; (3) The unbalanced horizontal force generated by the anchor cables in the stepped hollow anchor is mainly offset by the mountain. In order to ensure that the anchor does not produce excessive displacement, the requirements for the mountain, the anchor, and the anchor cables are high. Therefore, it is of great significance to provide an anchor system for hoisting arch bridges on steep cliffs. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to solve one or more problems existing in the above-mentioned existing technology. For example, one of the purposes of this utility model is to provide a fastening system for hoisting steep cliff arch bridges that is suitable for various steep cliff arch bridges, can make reasonable use of terrain conditions, reduce the excavation of the mountain, reduce construction difficulty, shorten the construction period, and significantly save costs.

[0004] To achieve the above objectives, this utility model provides a fastening system for hoisting arch bridges on steep cliffs. The fastening system may include vertical pile foundations, a pile cap, anchor cables, and fastening cables. The anchor cables and fastening cables are installed on the pile cap, with the fastening cables located in the middle of the pile cap and the anchor cables symmetrically distributed on both sides of the fastening cables. The pile cap is connected to several vertical pile foundations.

[0005] According to one or more exemplary embodiments of one aspect of the present invention, the fastening system may further include a tensioning groove and ear walls, wherein the tensioning groove is disposed in the middle of one side of the pier, and the ear walls are disposed on both sides of the tensioning groove.

[0006] Furthermore, the height of the ear wall can be the same as the height of the support platform.

[0007] According to one or more exemplary embodiments of one aspect of the present invention, the width of the ear wall may be 0.75m or more; the length of the ear wall may be 1m or more.

[0008] According to one or more exemplary embodiments of one aspect of the present invention, the tensioning groove is a groove on the mountain side, and the tensioning operation space of the tensioning groove can be 1m×1m or more.

[0009] According to one or more exemplary embodiments of one aspect of the present invention, an anchor block may be provided on the support platform, and the end face angle of the anchor block may be perpendicular to the fastening cable and the anchor cable.

[0010] According to one or more exemplary embodiments of one aspect of the present invention, the width of the flange of the vertical pile foundation may be more than 10m.

[0011] According to one or more exemplary embodiments of one aspect of the present invention, both the fastening cable and the anchor cable can be made of prestressed steel strand with a tensile strength of 1860MPa and a diameter of 15.2mm.

[0012] According to one or more exemplary embodiments of one aspect of the present invention, the pier may be provided with a cable hole pipe for accommodating the buckle and the anchor cable.

[0013] Furthermore, the cable conduit may include a PVC pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model include at least one of the following:

[0015] (1) Through this utility model, the setting of the tower is optimized on both sides, eliminating the need to open up a large construction site, reducing construction time, and saving a lot of steel.

[0016] (2) No need to dig a lot of trenches on the slope, saving a lot of manpower and material resources, causing little damage to the mountain slope, reducing costs and construction difficulty.

[0017] (3) The unbalanced forces of the ties and anchors generated during the arch rib cantilever assembly process are offset by the vertical pile foundation, pile cap and mountain. Attached Figure Description

[0018] The above and other objects and features of this utility model will become clearer from the following description taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 A schematic diagram of the arrangement of the hooking system for hoisting an arch bridge on a steep cliff is shown.

[0020] Figure 2A A top sectional view of a hooking system for hoisting an arch bridge on a steep cliff, as shown in an exemplary embodiment of the present invention, is illustrated.

[0021] Figure 2B This utility model illustrates Figure 2A A cross-sectional view of the middle anchor cable along the I-I direction;

[0022] Figure 2C This utility model illustrates Figure 2A A cross-sectional view of the central buckle along the II-II direction;

[0023] Figure 3A A top sectional view of a fastening system for hoisting an arch bridge on a steep cliff is shown as another exemplary embodiment of the present invention.

[0024] Figure 3B This utility model illustrates Figure 3A A cross-sectional view of the middle anchor cable along the I-I direction;

[0025] Figure 3C This utility model illustrates Figure 3A A cross-sectional view of the central buckle along the II-II direction.

[0026] Explanation of key figure labels:

[0027] 1-Vertical pile foundation, 2-Pile cap, 3-Awl wall, 4-Tensioning groove, 5-Anchor cable, 6-Clamping cable, 7-Anchor pier. Detailed Implementation

[0028] In the following description, a fastening system for hoisting an arch bridge on a steep cliff will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0029] In the description of this application, it should be understood that the terms "middle," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," and "inner," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this utility model, unless otherwise stated, "multiple" or "several" means two or more. In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] For steep cliff arch bridges, such as the Yigong Zangbu Bridge on the Sichuan-Tibet Railway Section 4, which is a 310m main span, mid-span steel truss basket arch bridge, the superstructure was constructed using cable-stayed hoisting, assisted by a cable-stayed suspension system. The bridge site is located in a deep U-shaped valley with sheer cliffs, complex terrain, and narrow space. The original design required extensive construction work on both banks, necessitating large-scale excavation of the mountainside, making construction difficult, consuming significant manpower and resources, and requiring a long construction period, which did not meet the extremely tight schedule. Therefore, a suspension system with shorter construction time, lower difficulty, and lower cost was urgently needed.

[0031] In response to the problems of existing technology, this application proposes a fastening system for hoisting arch bridges on steep cliffs, in which "the fastening cable is directly connected to the mountain by an anchor body, and the pile foundation, abutment and mountain work together".

[0032] Exemplary Example 1

[0033] This exemplary embodiment provides a fastening system for hoisting arch bridges on steep cliffs.

[0034] like Figures 3A-3C As shown in the exemplary embodiment, the fastening system for hoisting an arch bridge on a steep cliff may include a vertical pile foundation 1, a pile cap 2, an anchor cable 5, and a fastening cable 6.

[0035] Anchor cables 5 and tie cables 6 are installed on the pile cap 2. Both anchor cables 5 and tie cables 6 are bundled, and several bundles of anchor cables 5 and tie cables 6 can be installed on the pile cap 2. Each bundle of anchor cables includes multiple anchor cables, and each bundle of tie cables includes multiple tie cables. The tie cables 6 are located in the middle of the pile cap 2, and the anchor cables 5 are symmetrically distributed on both sides of the tie cables 6. For example, 20 bundles of anchor cables and 8 bundles of tie cables can be installed on the pile cap. The 20 bundles of anchor cables are divided into two groups, symmetrically distributed on both sides of the 8 bundles of tie cables. The pile cap 2 is connected to several vertical piles 1, for example, four. The vertical piles 1 are perpendicular to the pile cap 2.

[0036] In this exemplary embodiment, the fastening system can be as follows: Figure 1 This system is designed for hoisting arch bridges. The fastening system can be achieved by filling the mountainside with plain concrete to ensure a close fit with the mountain.

[0037] In this exemplary embodiment, a plurality of anchor blocks may be provided on the pier. The anchor blocks are used for securing the cables and tensioning the anchor cables. Specifically, as shown... Figure 3B As shown, the anchor block 7 can be set at the left end of the anchor cable 5; as Figure 3C As shown, anchor 7 can be set at the right end of the tie cable 6. That is, the tie cable anchor is set on the mountain-facing side of the pier cap, and the anchor cable anchor is set on the opposite side of the mountain-facing side.

[0038] Furthermore, the end face angle of the anchor block can be perpendicular to the tie cable and the anchor cable.

[0039] In this exemplary embodiment, the width of the vertical pile foundation's flange can be 10m or more.

[0040] In this exemplary embodiment, the sling can be made of φ15.2mm prestressed steel strand with a tensile strength of 1860MPa; the anchor cable can be made of φ15.2mm prestressed steel strand with a tensile strength of 1860MPa.

[0041] In this exemplary embodiment, the pier may be provided with a plurality of cable hole channels for accommodating each bundle of buckle cables and anchor cables.

[0042] Furthermore, the cable conduit may include PVC pipe.

[0043] Exemplary Example 2

[0044] This exemplary embodiment provides another fastening system for hoisting arch bridges on steep cliffs.

[0045] Based on Exemplary Example 1, the fastening system for hoisting an arch bridge on a steep cliff in this exemplary embodiment may further include tensioning grooves and abutment walls. That is, as shown in Example 1... Figures 2A to 2C As shown in the exemplary embodiment, the fastening system for hoisting an arch bridge on a steep cliff may include a vertical pile foundation 1, a pile cap 2, an anchor cable 5, a fastening cable 6, a tensioning groove 4, and an abutment wall 3.

[0046] Anchor cables 5 and tie cables 6 are installed on the pier cap 2. Both anchor cables 5 and tie cables 6 are bundled, and several bundles of anchor cables 5 and tie cables 6 can be installed on the pier cap 2. Each bundle of anchor cables includes multiple anchor cables, and each bundle of tie cables includes multiple tie cables. The tie cables 6 are located in the middle of the pier cap 2, and the anchor cables 5 are symmetrically distributed on both sides of the tie cables 6. For example, 12 bundles of anchor cables and 4 bundles of tie cables can be installed on the pier cap. The 12 bundles of anchor cables are divided into two groups and symmetrically distributed on both sides of the 4 bundles of tie cables. The tensioning groove 4 is located in the middle of one side of the pier cap 2, and the abutment wall 3 is located on both sides of the tensioning groove 4. The pier cap 2 is connected to several vertical piles 1, for example, two. The vertical piles 1 are perpendicular to the pier cap 2.

[0047] In this exemplary embodiment, the fastening system can be as follows: Figure 1 Arranged for arch bridge hoisting. The fastening system can be secured to the mountainside via the side walls.

[0048] In this exemplary embodiment, a plurality of anchor blocks may be provided on the pier. The anchor blocks are used for securing the cables and tensioning the anchor cables. Specifically, as shown... Figure 2B As shown, the anchor block 7 can be set at the left end of the anchor cable 5; as Figure 2C As shown, anchor 7 can be set at the right end of the tie cable 6. That is, the tie cable anchor is set on the mountain-facing side of the pier cap, and the anchor cable anchor is set on the opposite side of the mountain-facing side.

[0049] Furthermore, the end face angle of the anchor block can be perpendicular to the tie cable and the anchor cable.

[0050] In this exemplary embodiment, the tensioning groove can be located on the side near the mountain. The tensioning groove serves as a tensioning operation space for operators, and the size of the tensioning operation space is 1m × 1m or more.

[0051] In this exemplary embodiment, the height of the ear wall can be the same as the height of the foundation.

[0052] In this exemplary embodiment, the width of the ear wall may be 0.75m or more; the length of the ear wall may be 1m or more.

[0053] In this exemplary embodiment, the width of the vertical pile foundation's flange can be 10m or more.

[0054] In this exemplary embodiment, the sling can be made of φ15.2mm prestressed steel strand with a tensile strength of 1860MPa; the anchor cable can be made of φ15.2mm prestressed steel strand with a tensile strength of 1860MPa.

[0055] In this exemplary embodiment, the pier may be provided with a plurality of cable hole channels for accommodating each bundle of buckle cables and anchor cables.

[0056] Furthermore, the cable conduit may include PVC pipe.

[0057] To better understand the exemplary embodiments of the present invention described above, further explanation is provided below with reference to specific examples.

[0058] Example 1

[0059] This example provides a hooking system for hoisting arch bridges on steep cliffs.

[0060] The fastening system in this example mainly includes: a cable anchor, which adopts a pile + pile cap foundation structure and is mainly composed of vertical pile foundation, pile cap, anchor cable (prestressed anchor cable), cable and anchor pier. In addition, for different terrains and geology, the anchor can also be equipped with tensioning grooves and abutment walls.

[0061] For anchors with tensioning channels and abutment walls, the anchors are directly abutted against the mountain through the abutment walls; for anchors without tensioning channels and abutment walls, the anchors are filled with plain concrete on the mountain-facing side to ensure close contact with the mountain.

[0062] The vertical pile foundation adopts a reinforced concrete structure. The dimensions and length requirements should be determined by the calculation of the foundation bearing capacity, and the width of the flange should not be less than 10m. The vertical pile foundation serves two purposes: first, to counteract the unbalanced horizontal force between the anchor cables (anchor cables and tie cables) caused by the continuous change in the cable force during the cantilever construction of the arch rib; and second, to counteract the vertical component force of the anchor cables.

[0063] The foundation is a reinforced concrete cube structure. Its minimum structural dimensions should be determined based on its sufficient strength to withstand the bending moment generated by the anchor cables. Anchor cable holes (which may include PVC pipes) are pre-installed in the foundation. Anchor cable holes are located at both ends of the foundation, and anchor cable holes are located in the middle. The diameter of the pre-embedded PVC pipe should be determined based on the number of anchor cables per bundle in the design, and the pre-embedded angle of the anchor cable pipe should be calculated based on the actual anchor cable curve. The tensioning ends of the anchor cables are all located on the foundation. Anchor blocks for anchor cable tensioning are installed on the foundation. The anchor blocks are reinforced concrete structures, and the end face angle of the anchor blocks is perpendicular to the anchor cables.

[0064] The tensioning channel is a recessed groove on the mountainside near the center of the ground anchor, used as an operating space for tensioning personnel. The dimensions of the operating space should be no less than 1×1m. The abutment walls are reinforced concrete structures supporting the tensioning channel on both sides of the mountain. They are used to transfer the horizontal force of the anchor cables to the mountain surface. The height of the abutment walls is consistent with the height of the foundation, and the minimum width is 0.75m. Considering the arrangement of one row of anchor cables, the width of the abutment walls increases proportionally with the number of anchor cable rows. The minimum length is 1m, and the actual length should be determined according to the distance from the foundation to the mountain through the abutment walls.

[0065] Both the anchor cables and the tie cables can be made of φ15.2mm low-relaxation prestressed steel strands with a tensile strength of 1860MPa. The tie cables are used to control the shape of the arch ribs during the cantilever construction. The tie cable force is calculated based on the above functions, and the number of tie cables per bundle should be determined based on the tie cable force calculation. The anchor cables are used to ensure that the horizontal displacement of the ground ridge does not exceed ±2mm. The anchor cable force is calculated based on the above functions, and the number of anchor cables per bundle should be determined based on the anchor cable force calculation.

[0066] In summary, the beneficial effects include:

[0067] This invention provides a fastening system for hoisting arch bridges on steep cliffs, primarily applicable to bridge engineering. This fastening system is suitable for various steep cliff arch bridges, making efficient use of terrain conditions, reducing excavation of the mountain, lowering construction difficulty, shortening the construction period, and significantly saving costs. Through this system, the setting of anchor towers can be optimized on both banks, eliminating the need for large construction sites, reducing construction time, and saving a significant amount of steel. It also eliminates the need for extensive trenching on the slope, saving considerable manpower and resources, minimizing damage to the mountain slope, and reducing costs and construction difficulty. Furthermore, the unbalanced force of the anchor cables generated during the cantilever assembly of the arch ribs is offset by the vertical pile foundations, abutments, and the mountain itself.

[0068] Although a fastening system for hoisting an arch bridge on a steep cliff has been described above in conjunction with exemplary embodiments, those skilled in the art should understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A lashing system for hoisting a steep cliff arch bridge, characterized in that, The buckle hanging system comprises vertical pile foundation, bearing platform, anchor cable and buckle cable, wherein, The anchor cable and the buckle cable are arranged on the bearing platform, the buckle cable is located in the middle of the bearing platform, and the anchor cables are symmetrically distributed on both sides of the buckle cable; the bearing platform is connected with several vertical pile foundations.

2. The lashing system for hoisting an arch bridge over a steep cliff according to claim 1, wherein The buckle hanging system further comprises tensioning groove and ear wall, the tensioning groove is arranged in the middle of one side of the bearing platform, and the ear wall is arranged on both sides of the tensioning groove.

3. The lashing system for hoisting an arch bridge over a steep cliff according to claim 2, wherein, The height of the ear wall is consistent with the height of the bearing platform.

4. The lashing system for hoisting an arch bridge on a steep cliff according to claim 2 or 3, characterized in that, The width of the ear wall is greater than 0.75m, and the length of the ear wall is greater than 1m.

5. The lashing system for hoisting an arch bridge over a steep cliff according to claim 2, wherein The tensioning groove is a side recess, and the size of the tensioning operation space of the tensioning groove is greater than 1m×1m.

6. The lashing system for hoisting an arch bridge over a steep cliff according to claim 1, wherein An anchor pier is arranged on the bearing platform, and the end face angle of the anchor pier is perpendicular to the buckle cable and the anchor cable.

7. The lashing system for hoisting an arch bridge over a steep cliff according to claim 1, wherein The width of the cuff of the vertical pile foundation is greater than 10m.

8. The latching system for hoisting of steep cliff arch bridges according to claim 1, characterized in that, Both the buckle cable and the anchor cable are made of φ15.2mm prestressed steel strand with tensile strength of 1860MPa.

9. The latching system for hoisting of steep cliff arch bridges according to claim 1, characterized in that, A cable hole pipeline for accommodating the buckle cable and the anchor cable is arranged in the bearing platform.

10. The lashing system for hoisting an arch bridge over a steep cliff according to claim 9, wherein, The cable hole pipeline comprises PVC pipe.

Images