Arch section connecting structure of broken line arch bridge, construction method and arch bridge

Abstract

The invention relates to the technical field of bridge construction, in particular to an arch section connecting structure of a broken line arch bridge, a construction method and the arch bridge. An arch section connecting structure of a broken line arch bridge comprises arch sections, and the ends of every two adjacent arch sections are opposite. The bottom of each stand column is connected to the joint of every two adjacent arch sections; one side of each lap joint plate is connected to the end of the corresponding arch section, every two adjacent arch sections are positioned through the corresponding lap joint plate, and the two lap joint plates used for lap joint are provided with corresponding positioning components. Due to the fact that the bottoms of the stand columns are connected to the connecting positions of the two adjacent arch sections, force of the bridge floor of the arch bridge is directly transmitted to the arch sections through the stand columns, and stress at the connecting positions of the arch sections is concentrated. The lap joint plate has large cross-sectional area and inertia moment, so that the lap joint plate is better than steel bars in the aspect of resisting deformation such as bending and twisting. Therefore, before the arch section is hoisted and positioned, the lap joint plate is not easy to deform, and the positioning precision during hoisting can be ensured as much as possible.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to an arch segment connection structure of a broken-line arch bridge, a construction method and an arch bridge. Background Art

[0002] A zigzag arch bridge is an arch bridge structure that is characterized by the arch structure under the bridge deck being in the shape of one or more zigzag lines rather than the traditional smooth arc. This design can give the bridge a unique aesthetic appearance and may also bring certain advantages in engineering, such as adapting to specific terrain conditions, dispersing loads, or improving structural stability in specific building environments. Figure 1-Figure 3 As shown, the arch rib of the broken line arch bridge includes multiple prefabricated arch segments 1, and the arch rib is connected to the bridge deck 6 through a column 2. The bottom of the column 2 is connected to the connection between two adjacent arch segments 1. The two arch ribs are connected by an inter-arch beam 7.

[0003] The zigzag arch bridge has the stress characteristics of the traditional suspended arch bridge, which can reduce the main arch bending moment, thereby reducing the cross-sectional size and increasing the span capacity of the structure. At the same time, the zigzag arch bridge is very suitable for assembly and rapid construction, which can effectively shorten the construction period and ensure the casting quality of concrete components, with significant economic benefits. However, unlike the traditional suspended arch bridge, the zigzag arch bridge needs to connect the arch ribs, columns and cross braces at the joint position, with loads in multiple directions, complex stress, and prone to stress concentration. Therefore, the connection structure at the joint position has a very important impact on the engineering quality of the zigzag arch.

[0004] The existing arch rib construction joints generally use reserved steel bars in the arch rib segments. After the arch ribs are hoisted in place, the reserved steel bars are tied and then concrete is poured to form a whole. However, the steel bars are not rigid enough, making it difficult to locate two adjacent arch segments when hoisting the arch segments. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem in the prior art that two adjacent arch ribs are connected by reserving steel bars and then pouring concrete, the steel bars are not rigid enough, and it is difficult to position two adjacent arch sections when hoisting the arch sections, and to provide an arch section connection structure of a broken line arch bridge, a construction method and an arch bridge.

[0006] In a first aspect, the present invention provides an arch segment connection structure of a folding arch bridge, comprising:

[0007] Arch segments, wherein the ends of two adjacent arch segments are opposite to each other;

[0008] A column, the bottom of which is connected to the connection between two adjacent arch segments;

[0009] A lap plate, one side of which is connected to the end of the arch segment, two adjacent arch segments are positioned by the lap plate, and the two lap plates for lap connection are provided with corresponding positioning components.

[0010] After the two adjacent arch sections are positioned by the lap plates, the joints must be cast to complete the connection of the two adjacent arch sections.

[0011] Because the bottom of the column is connected to the connection of the two adjacent arch sections, the force of the arch bridge deck is directly transmitted to the arch section through the column, so the stress at the connection of the arch section is relatively concentrated. Because the two adjacent arch sections are positioned by the lap plate, a lap plate is provided at the end of each arch section. The lap plate has a larger cross-sectional area and moment of inertia, which makes it better than steel bars in resisting deformation such as bending and twisting. Therefore, before the arch section is hoisted and positioned, the lap plate is less likely to deform, and the positioning accuracy during hoisting can be guaranteed as much as possible. In addition, the lap plate is provided with a positioning component, so it is convenient to position the two adjacent arch sections during hoisting, which is conducive to saving construction time and improving construction efficiency.

[0012] Preferably, the positioning member of the overlapping plates comprises connecting holes, and the connecting holes of the two overlapping plates are correspondingly arranged.

[0013] The two plates for overlapping are correspondingly provided with connecting holes, so that screws or pins can pass through the connecting holes for positioning, which is easy to operate.

[0014] Preferably, the lap plate is also provided with a through hole.

[0015] Because the connection between two adjacent arch sections will be cast, the concrete will pass through the through hole to form a soil shear tenon, which effectively connects the lap plate and the arch section to enhance the bearing capacity of the arch rib.

[0016] Preferably, the overlapping plate comprises a fixing portion and an overlapping portion, the fixing portion is used to connect the arch segments, and the overlapping portion is used to overlap the overlapping plates of adjacent arch segments.

[0017] The fixed part is used to connect the corresponding arch sections, and the overlap part is used to overlap the adjacent overlap plates, but not the entire overlap plate is used for overlap. When the overlap plate is subjected to the thermal expansion and contraction effect caused by temperature changes, the overlap plate has a larger space for relief, because the gap can provide space for the material to expand and reduce the stress concentration caused by temperature.

[0018] Preferably, at least three lap plates are connected to the end of the arch segment, wherein the three lap plates are arranged at intervals along the direction of the width of the end face of the arch segment, and the width of the fixed part of the lap plates arranged on both sides of the end face is greater than the width of the fixed part of the lap plates arranged in the middle of the end face.

[0019] The width direction of the arch section and the width direction of the bridge deck are in the same direction. The width of the fixed portion is the distance from the side of the fixed portion away from the lap joint to the lap joint. If the width of the fixed portion of the lap joint plate arranged outside is larger, it avoids the situation where the connection points of multiple lap joint plates and the arch section are on the same line, and can increase the shear resistance of the arch section connection.

[0020] Preferably, a transverse partition is further provided at the end of the arch segment, and the transverse partition is connected to the side surface, top surface and bottom surface of the arch segment.

[0021] Because there is stress concentration at the arch section connection, a diaphragm is set, and the diaphragm is connected to the side, top and bottom surfaces of the arch section. The diaphragm can transfer the stress at the connection to other places of the arch section, effectively alleviating the stress concentration at the connection.

[0022] Preferably, the distance between two adjacent transverse partitions decreases from top to bottom.

[0023] The distance reduction method includes various reduction rules such as linear reduction and step reduction. When the spacing of the diaphragms decreases from top to bottom, the concrete poured at the connection is larger at the top and smaller at the bottom, which is suitable for the pressure above the arch rib.

[0024] Preferably, the size of the top surface of the arch segment is larger than the size of the bottom surface of the arch segment.

[0025] Because in actual use, the stress concentration phenomenon on the top surface of the arch segment is more serious than the stress concentration phenomenon on the bottom surface of the arch segment, the size of the top plate is larger than that of the bottom plate, which is conducive to alleviating the stress concentration phenomenon at the connection.

[0026] Preferably, it further comprises prestressed steel bars, both ends of which are respectively connected to the ends of the two opposite arch sections.

[0027] By arranging prestressed steel bars in two opposite arch sections, the shear bearing capacity of the arch section connection can be improved.

[0028] Preferably, the upper and lower parts of the arch segment are respectively provided with n 上 and n 下 The number of prestressed steel bars, n 上 and n 下 The value requirements are as follows:

[0029]

[0030] Among them, M max is the maximum bending moment at the connecting surface of two adjacent arch segments, M min K is the minimum bending moment of the connecting surface of two adjacent arch segments; 上 K is the cross-sectional core distance of the prestressed steel bars in the upper part of the arch segment, 下is the cross-sectional core distance of the prestressed steel bars at the lower part of the arch section; e 上 is the eccentricity of the prestressed steel bar at the upper part of the arch segment relative to the centroidal axis of the cross section, e 下 A is the eccentricity of the prestressed steel bar at the lower part of the arch segment relative to the centroidal axis of the cross section; p is the tendon area of ​​a single prestressed steel bar; pe is the effective prestress of the prestressed steel bar; F is the axial force on the connecting surface of the two adjacent arch sections, f cd Allowable compressive stress of concrete.

[0031] Preferably, a reinforcing truss is provided on the top surface of the connection between the two arch segments, and the two sides of the reinforcing truss are respectively connected to the lap plates located on the two sides of the end surface.

[0032] Strengthening the connection between the truss and the lap plate can prevent the lap plate from experiencing out-of-plane instability.

[0033] In a second aspect, the present invention provides a method for constructing an arch segment connection structure, which is used to construct an arch segment connection structure of a broken-line arch bridge as described above, comprising the following steps:

[0034] Step 1: hoist the prefabricated first arch segment to the designed position and connect the cable through the cable hoisting system, one end of the first arch segment is connected to the arch foot, and the cable force is tensioned to complete the construction of the first arch segment;

[0035] Step 2: hoisting the prefabricated second arch segment to the designed position through the cable hoisting system and connecting the buckle cable, one end of the second arch segment is connected to the first arch segment, and two opposite lap plates are connected in the air through bolts;

[0036] Step 3: tensioning the cable force, adjusting the second arch segment to the designed elevation, then tying the steel bars at the joint of the first arch segment and the second arch segment and arranging the prestressed steel bars to be tensioned;

[0037] Step 4: Pour the joint concrete, tension the prestressed steel bars after the concrete reaches the designed strength, and perform grouting and anchor sealing to complete the arch section connection structure construction.

[0038] The construction method comprises the following steps: hoisting the first arch section connected to the arch foot to a predetermined position through a cable hoisting system, and then tensioning the cable to fine-tune the position of the first arch section, so as to facilitate operation; then hoisting the second arch section to the designed position, first connecting the first arch section and the second arch section, so that the first arch section and the cable can jointly bear the force of the second arch section, which is beneficial to the stability of the structure during construction; then fine-tuning the position of the second arch section and arranging the steel bars at the joint position and the prestressed steel bars to be tensioned, and finally pouring concrete and tensioning the prestressed steel bars to complete the construction.

[0039] In a third aspect, the present invention provides an arch bridge, comprising the arch segment connection structure of the above-mentioned broken-line arch bridge.

[0040] The arch segment connection structure of the folding arch bridge as described above is used to facilitate positioning when installing the arch segments, which is beneficial to improving the accuracy of installation. In addition, the lap plate is provided with a positioning component, so it is convenient to position two adjacent arch segments during hoisting, which is beneficial to saving construction time and improving construction efficiency.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The present invention provides an arch segment connection structure of a broken-line arch bridge, comprising an arch segment, a column and a lap plate. Two adjacent arch segments are connected by a lap plate. The lap plate has a larger cross-sectional area and moment of inertia, which makes it better than steel bars in resisting deformations such as bending and twisting. Therefore, before the arch segment is hoisted and positioned, the lap plate is less likely to deform, and the positioning accuracy during hoisting can be guaranteed as much as possible. In addition, the lap plate is provided with a positioning component, so it is convenient to position the two adjacent arch segments during hoisting, which is beneficial to saving construction time and improving construction efficiency. This device solves the problem in the prior art that two adjacent arch ribs are connected by reserving steel bars and then pouring concrete, the steel bars are not rigid enough, and it is difficult to position the two adjacent arch segments when hoisting the arch segment.

[0043] 2. The present invention provides a method for constructing an arch segment connection structure, in which a first arch segment connected to an arch foot is hoisted to a predetermined position through a cable hoisting system, and then the cable force is tensioned to fine-tune the position of the first arch segment, which is convenient for operation; then the second arch segment is hoisted to the designed position, and the first arch segment and the second arch segment are first connected, so that the first arch segment and the cable jointly bear the force of the second arch segment, which is beneficial to the stability of the structure during construction; then the position of the second arch segment is finely adjusted and the steel bars at the joint position and the prestressed steel bars to be tensioned are arranged, and finally concrete is poured and the prestressed steel bars are tensioned to complete the construction.

[0044] 3. The present invention provides an arch bridge, including the arch segment connection structure of the above-mentioned broken line arch bridge, which is convenient for positioning when installing the arch segment and helps to improve the accuracy of installation. The lap plate is provided with a positioning member, so it is convenient to position two adjacent arch segments during hoisting, which helps to save construction time and improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of a broken-line arch bridge in the prior art;

[0046] Figure 2 It is a schematic diagram of the connection of two adjacent arch segments in the prior art;

[0047] Figure 3 It is a schematic diagram of the connection of two arch ribs in the prior art;

[0048] Figure 4 This is a schematic diagram of the structure of the arch segment connection structure of a broken line arch bridge in Example 1. Figure 1 ;

[0049] Figure 5 This is a schematic diagram of the structure of the arch segment connection structure of a broken line arch bridge in Example 1. Figure 2 ;

[0050] Figure 6 This is a schematic diagram of the connection between two adjacent arch segments in Example 1. Figure 1 (with reinforced truss plate);

[0051] Figure 7 This is a schematic diagram of the connection between two adjacent arch segments in Example 1. Figure 2 (No reinforced truss plate is provided);

[0052] Figure 8 is a schematic diagram of the connection between the lap plate and the arch segment in Example 1;

[0053] Fig. 9 is a schematic structural diagram of the first lap plate in Example 1;

[0054] Fig.10 is a schematic structural diagram of the second lap plate in Example 1;

[0055] Fig.11 It is a schematic diagram of the stress condition of the bottom surface of the arch section when no diaphragm is provided;

[0056] Fig.12 It is a schematic diagram of the stress condition on the top surface of the arch section when no diaphragm is provided;

[0057] Fig.13 It is a schematic diagram of the stress condition on the top surface of the arch section after the diaphragm is set;

[0058] Fig.14 It is a schematic diagram of the stress condition of the bottom surface of the arch section after the diaphragm is set;

[0059] Fig.15 is a schematic diagram of the arrangement of the lap plates in Example 1;

[0060] Fig.16 This is a schematic diagram of the structure of the arch segment connection structure of a broken line arch bridge in Example 1. Figure 3 (with prestressed steel bars);

[0061] Fig.17 It is a schematic diagram of the arrangement of prestressed steel bars;

[0062] Fig.18 This is a schematic diagram of the connection between two adjacent arch segments in Example 1. Figure 3 (with reinforced trusses and prestressed steel bars);

[0063] Fig.19 It is a comparative diagram of the shear bearing capacity of the arch section after prestressed steel bars are set;

[0064] Fig. 20 This is a schematic diagram of the construction of the arch segment connection structure. Figure 1 ;

[0065] Fig.21 This is a schematic diagram of the construction of the arch segment connection structure. Figure 2 ;

[0066] Fig. 22 This is a schematic diagram of the construction of the arch segment connection structure. Figure 3 ;

[0067] Fig.23 This is a schematic diagram of the construction of the arch segment connection structure. Figure 4 .

[0068] Icons: 1-arch segment, 101-first arch segment, 102-second arch segment, 2-column, 3-cross diaphragm, 4-lap plate, 401-first lap plate, 402-second lap plate, 403-connecting hole, 404-through hole, 5-reinforced steel, 6-bridge deck, 7-cross beam between arches, 8-prestressed steel bars. DETAILED DESCRIPTION

[0069] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0070] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0071] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0072] In addition, the expressions “first”, “second”, “third”, etc. that appear in the terms are merely descriptions used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0073] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0074] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0075] Example 1

[0076] like Figure 4 As shown, an arch segment connection structure of a broken line arch bridge comprises: an arch segment 1, wherein the ends of two adjacent arch segments 1 are opposite to each other; a column 2, wherein the bottom of the column 2 is connected to the connection of two adjacent arch segments 1; a lap plate 4, wherein one side of the lap plate 4 is connected to the end of the arch segment 1, and the two adjacent arch segments are positioned by the lap plate 4, and the two lap plates 4 for lap connection are provided with corresponding positioning components.

[0077] Because the bottom of the column 2 is connected to the connection of two adjacent arch sections 1, the force of the arch bridge deck is directly transmitted to the arch section 1 through the column 2, so the stress at the connection of the arch section 1 is relatively concentrated. Because the two adjacent arch sections 1 are positioned by the lap plate 4, a lap plate 4 is provided at the end of each arch section 1. The lap plate 4 has a larger cross-sectional area and moment of inertia, which makes it better than steel bars in resisting deformation such as bending and twisting. Therefore, before the arch section 1 is hoisted and positioned, the lap plate 4 is less likely to deform, and the positioning accuracy during hoisting can be guaranteed as much as possible. In addition, the lap plate 4 is provided with a positioning component, so it is convenient to position the two adjacent arch sections 1 during hoisting, which is conducive to saving construction time and improving construction efficiency.

[0078] In this embodiment, Fig.15 As shown, the lap plate 4 includes two types: a first lap plate 401 and a second lap plate 402. Figure 5-Figure 8 As shown, the first lap plate 401 is arranged on both sides of the arch section 1, and the second lap plate 402 is arranged in the middle of the arch section 1, and the distance between the second lap plate 402 and the two first lap plates 401 is equal. In actual use, the number of second lap plates 402 can be increased. However, it is necessary to ensure that the lap plates 4 are evenly spaced and the distance between two adjacent lap plates 4 is equal. Fig. 9 and Fig.10 As shown, the lap plate 4 includes a fixed portion and an overlap portion, the fixed portion is used to connect the arch segment 1, and the overlap portion is used to overlap the lap plates 4 of adjacent arch segments 1. In this embodiment, the portion with the angle is the overlap portion. In this embodiment, the turning angle of the overlap portion is consistent with the broken line arch, the diameter of the through hole 404 is 100mm, and the diameter of the connecting hole 403 is 34mm. The fixed portion is used to connect the corresponding arch segment 1, and the overlap portion is used to overlap the adjacent lap plates 4, not the entire lap plate 4 is used for overlap. When the lap plate 4 is subjected to the thermal expansion and contraction effect caused by temperature changes, the lap plate 4 has a larger relief space, because the gap can provide space for the material to expand and reduce the stress concentration caused by temperature. In the process of fixing, the overlap portions of the two lap plates 4 overlap each other, thereby completing the positioning. The length of the fixed portion of the first lap plate 401 is greater than the length of the fixed portion of the second lap plate 402. The width of the fixing portion provided on the first lap plate 401 is larger, so that the connection points of multiple lap plates 4 and arch segments 1 are avoided to be on the same line, thereby increasing the shear resistance of the connection points of the arch segments 1. Figure 6 and Figure 7 As shown, the top surface of the lap plate 4 is higher than the protruding connecting plate of the arch section 1, which is convenient for welding.

[0079] like Fig. 9 and Fig.10As shown, the positioning member of the lap plate 4 includes a connecting hole 403, and the connecting holes 403 of the two lapped plates are correspondingly arranged. In this embodiment, the connecting hole 403 is arranged at the lap portion of the lap plate 4. Then in the actual positioning use process, when the lap portions of the two lap plates 4 overlap, a bolt or a pin passes through the connecting hole 403 to complete the connection of the two lap plates 4. The lap plate 4 is also provided with a through hole 404, and the through hole 404 is provided in both the lap portion and the fixing portion. The size of the through hole 404 is larger than the size of the connecting hole 403. Because in the actual fixing process, the relative positions of the two arch sections 1 need to be poured with concrete to complete the final connection, there will be concrete inside the through hole 404 to form a PBL shear key, thereby enhancing the bearing capacity of this arch rib.

[0080] like Figure 4 As shown, a diaphragm 3 is also provided at the end of the arch section 1, and the diaphragm 3 is connected to the side, top and bottom surfaces of the arch section 1. Because there is a stress concentration phenomenon at the connection of the arch section 1, a diaphragm 3 is provided, and the diaphragm 3 is connected to the side, top and bottom surfaces of the arch section 1, so that the diaphragm 3 can transfer the stress at the connection to other places of the arch section 1, effectively alleviating the stress concentration at the connection. The diaphragm 3 includes three units, and the first unit and the third unit are connected on both sides of the second unit. The axis of the arch section 1 is perpendicular to the plane where the second unit is located. There is an angle between the first unit and the top surface of the arch section 1; there is an angle between the third unit and the bottom surface of the arch section 1. In this way, after the concrete is poured, the concrete block at the upper part of the connection and the concrete at the lower part are both wedge-shaped, which is suitable for the situation where the upper arch rib is compressed.

[0081] After the transverse partition 3 is provided, the stress concentration at the connection is effectively alleviated. Fig.11 and Fig.12 The figure shows the stress on the bottom and top of the arch section 1 when no transverse diaphragm 3 is provided. The blue and green parts represent the larger stress. Fig.11 and Fig.12 It can be seen that when no transverse diaphragm 3 is provided, the stress concentration phenomenon on the bottom and top surfaces of the arch segment 1 is relatively serious. Fig.13 and Fig.14 The stress conditions of the bottom and top surfaces of the arch section 1 after the transverse diaphragm 3 is set. It can be seen that the stress concentration conditions of the bottom and top surfaces of the arch section 1 have been alleviated.

[0082] like Figure 4 As shown, after the transverse partition 3 is provided, the end of the arch section 1 protrudes from the transverse partition 3. One side of the fixing portion of the first lap plate 401 is connected to the inner side wall of the arch section 1. It can be welded or bolted.

[0083] Depend on Fig.11 and Fig.12It can be seen that the stress concentration phenomenon on the top surface of the arch segment 1 is more serious than the stress concentration phenomenon on the bottom surface of the arch segment 1 , so the size of the top surface of the arch segment 1 is larger than the size of the bottom surface of the arch segment 1 .

[0084] like Figure 6 As shown, a reinforcing truss is provided on the top surface of the connection of the two arch sections 1, and the two sides of the reinforcing truss are respectively connected to the lap plates 4 located on both sides of the end surface. The reinforcing truss is composed of a plurality of reinforcing steel sections 5. In this embodiment, angle steel is used for easy welding and fixing. However, in specific use, different types of steel sections can be replaced as needed. The reinforcing truss is provided at the connection, and the bottom surface of the column 2 is connected to the reinforcing truss. The reinforcing truss is provided to increase the bearing capacity of the arch rib and alleviate the stress concentration as much as possible.

[0085] like Figure 16-18 As shown, it also includes prestressed steel bars 8, and the two ends of the prestressed steel bars 8 are respectively connected to the ends of the two opposite arch sections 1. In this embodiment, the two opposite arch sections 1 are provided with a total of sixteen prestressed steel bars 8, eight of which are arranged at the top and eight at the bottom. The sixteen prestressed steel bars 8 are symmetrically arranged about the second lap plate 402. After the prestressed steel bars 8 are arranged, the shear bearing performance of the arch section 1 can be effectively enhanced. Fig.19 As shown, for a component of the same size and the same material, after adding 8 prestressed steel bars, the shear bearing capacity is 3.2 times that of the original component.

[0086] The upper and lower parts of the arch section 1 are respectively provided with n 上 and n 下 The prestressed steel bars are 8, n 上 and n 下 The value requirements are as follows:

[0087]

[0088] Among them, M max is the maximum bending moment of the connecting surface of two adjacent arch segments 1, M min K is the minimum bending moment of the connecting surface of two adjacent arch segments 1; 上 K is the cross-sectional core distance of the prestressed steel bar 8 at the upper part of the arch segment 1, 上 =W 上 / A, A is the concrete area of ​​the main beam, W 上 is the section modulus of the upper edge of the connecting surface of two adjacent arch segments 1, K 下 K is the cross-sectional core distance of the prestressed steel bar 8 at the lower part of the arch section 1, 下 =W 下 / A,W 下 Section modulus of the lower edge of the connecting surface of two adjacent arch segments 1; e 上is the eccentricity of the prestressed steel bar 8 at the upper part of the arch section 1 relative to the centroidal axis of the cross section, e 下 A is the eccentricity of the prestressed steel bar 8 at the lower part of the arch section 1 relative to the centroidal axis of the cross section; p is the tendon area of ​​a single prestressed steel bar 8; σ pe is the effective prestress of the prestressed steel bar 8, σ pe =(0.5~0.6)f tk , f tk is the standard strength of the prestressed steel bar 8; F is the axial force on the connecting surface of the two adjacent arch segments 1, f cd Allowable compressive stress of concrete.

[0089] The derivation process of the above formula is as follows:

[0090] The prestressed steel strands are estimated according to the requirements for positive section crack resistance, so that no tensile stress appears at the upper and lower edges of the section, and the concrete at the upper and lower edges is not crushed, with compression being considered positive.

[0091] When the connecting surfaces of two adjacent arch segments 1 are subjected to M max When , the stress on the connection surface has the following relationship:

[0092]

[0093]

[0094] Among them, σ 上 is the normal stress on the upper edge of the connecting surface of two adjacent arch segments 1, σ 下 is the normal stress at the lower edge of the connecting surface of two adjacent arch segments 1, and N 上 =n 上 A p σ Pe , N 下 =n 下 A p σ Pe ;

[0095] When the connecting surfaces of two adjacent arch segments 1 are subjected to M min When , the stress on the connection surface has the following relationship:

[0096]

[0097] Combining the above four formulas, we can derive n 上 and n 下 The value of requires a formula.

[0098] Example 2

[0099] like Figure 20-23As shown, a method for constructing an arch segment connection structure, which is used to construct an arch segment connection structure of a broken-line arch bridge as described in Example 1, comprises the following steps:

[0100] Step 1: hoist the prefabricated first arch segment 101 to the designed position and connect the buckle cable through the cable hoisting system, one end of the first arch segment 101 is connected to the arch foot, and the buckle cable force is tensioned to fine-tune the position of the first arch segment 101, thereby completing the construction of the first arch segment 101;

[0101] Step 2: hoist the prefabricated second arch section 102 to the designed position through the cable hoisting system and connect the buckle cable, one end of the second arch section 102 is connected to the first arch section 101, and two opposite lap plates 4 are connected in the air through bolts;

[0102] Step 3: tensioning the cable to adjust the second arch segment 102 to the designed elevation, then tying the steel bars at the joint of the first arch segment 101 and the second arch segment 102 and arranging the prestressed steel bars 8 to be tensioned;

[0103] Step 4: pour the joint concrete, tension the prestressed steel bars 8 after the concrete reaches the designed strength, and perform grouting and anchor sealing to complete the construction of the arch section connection structure.

[0104] The first arch segment 101 is the arch segment 1 connected to the arch foot, and the second arch segment 102 is the arch segment 1 one end of which is connected to the first arch segment 101 .

[0105] In this construction method, the first arch segment 101 connected to the arch foot is hoisted to a predetermined position through a cable hoisting system, and then the cable force is tensioned to fine-tune the position of the first arch segment 101, which is easy to operate; then the second arch segment 102 is hoisted to the designed position, and the first arch segment 101 and the second arch segment 102 are first connected, so that the first arch segment 101 and the cable jointly bear the force of the second arch segment 102, which is beneficial to the stability of the structure during construction; then the position of the second arch segment 102 is finely adjusted and the steel bars at the joint position and the prestressed steel bars 8 to be tensioned are arranged, and finally concrete is poured and the prestressed steel bars 8 are tensioned to complete the construction.

[0106] Example 3

[0107] An arch bridge comprises an arch segment connection structure of a broken-line arch bridge as in Example 1.

[0108] The arch segment connection structure of a broken line arch bridge as in Example 1 is adopted, which is convenient for positioning when installing the arch segment 1, and is conducive to improving the accuracy of installation. In addition, the lap plate 4 is provided with a positioning member, so it is convenient to position two adjacent arch segments 1 during hoisting, which is conducive to saving construction time and improving construction efficiency.

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An arch segment connection structure of a broken-line arch bridge, characterized in that: Include: Arch segments (1), wherein the ends of two adjacent arch segments (1) are opposite to each other; A column (2), the bottom of which is connected to the connection point of two adjacent arch sections (1); a lap plate (4), one side of which is connected to the end of the arch section (1), the two adjacent arch sections are positioned by the lap plate (4), and the two lap plates (4) for lap connection are provided with corresponding positioning components.

2. The arch segment connection structure of a broken-line arch bridge according to claim 1, characterized in that: The positioning member of the overlapping plate (4) comprises a connection hole (403), and the connection holes (403) of the two overlapping plates are arranged correspondingly.

3. The arch segment connection structure of a broken-line arch bridge according to claim 1, characterized in that: The lap plate (4) is also provided with a through hole (404).

4. The arch segment connection structure of a folding arch bridge according to claim 1, characterized in that: The overlapping plate (4) comprises a fixing portion and an overlapping portion, the fixing portion being used to connect the arch segments (1), and the overlapping portion being used to overlap the overlapping plates (4) of adjacent arch segments (1).

5. The arch segment connection structure of a broken-line arch bridge according to claim 4, characterized in that: At least three lap plates (4) are connected to the end of the arch segment (1), wherein the three lap plates (4) are arranged at intervals along the direction of the width of the end face of the arch segment (1), and the width of the fixed portion of the lap plates (4) arranged on both sides of the end face is greater than the width of the fixed portion of the lap plates (4) arranged in the middle of the end face.

6. The arch segment connection structure of a folding arch bridge according to any one of claims 1 to 5, characterized in that: It also comprises prestressed steel bars (8), the two ends of which are respectively connected to the ends of the two opposite arch sections (1).

7. The arch segment connection structure of a folding arch bridge according to claim 6, characterized in that: The upper and lower parts of the arch section (1) are respectively provided with n 上 and n 下 The prestressed steel bars (8), n 上 and n 下 The value requirements are as follows: Among them, M max is the maximum bending moment of the connecting surface of two adjacent arch segments (1), M min K is the minimum bending moment of the connecting surface of two adjacent arch segments (1); 上 K is the cross-sectional core distance of the prestressed steel bar (8) at the upper part of the arch section (1), 下 is the cross-sectional core distance of the prestressed steel bar (8) at the lower part of the arch section (1); e 上 is the eccentricity of the prestressed steel bar (8) at the upper part of the arch section (1) relative to the centroidal axis of the cross section, e 下 A is the eccentricity of the prestressed steel bar (8) at the lower part of the arch section (1) relative to the centroidal axis of the cross section; p is the bundle area of ​​a single prestressed steel bar (8); σ pe is the effective prestress of the prestressed steel bar (8); F is the axial force on the connecting surface of the two adjacent arch sections (1), f cd Allowable compressive stress of concrete.

8. The arch segment connection structure of a folding arch bridge according to any one of claims 1 to 5, characterized in that: A reinforcing truss is provided on the top surface of the connection between the two arch sections (1), and the two sides of the reinforcing truss are respectively connected to the lap plates (4) located on the two sides of the end surface.

9. A method for constructing an arch segment connection structure, characterized in that: The method for constructing an arch segment connection structure of a broken-line arch bridge as claimed in any one of claims 1 to 8 comprises the following steps: Step 1: hoisting the prefabricated first arch segment (101) to the designed position and connecting the cable through the cable hoisting system, one end of the first arch segment (101) is connected to the arch foot, tensioning the cable to fine-tune the position of the first arch segment (101), and completing the construction of the first arch segment (101); Step 2: hoisting the prefabricated second arch segment (102) to the designed position by means of the cable hoisting system and connecting the buckle cable, wherein one end of the second arch segment (102) is connected to the first arch segment (101), and two opposite lap plates (4) are connected in the air by means of bolts; Step 3: tensioning the cable to adjust the second arch segment (102) to the designed elevation, then tying the steel bars at the joint of the first arch segment (101) and the second arch segment (102) and arranging the prestressed steel bars (8) to be tensioned; Step 4: pouring joint concrete, tensioning the prestressed steel bars (8) after the concrete reaches the designed strength, and performing grouting and anchor sealing to complete the construction of the arch section connection structure.

10. An arch bridge, characterized in that: An arch segment connection structure comprising a broken-line arch bridge as described in any one of claims 1-8.

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