Counter-pulling construction method of river-crossing cantilever structure

Abstract

The invention belongs to the technical field of municipal engineering construction, and discloses a counter-pulling construction method of a river-crossing cantilever structure. River-adjacent bridge sections are built on the two banks of the river channel respectively; a fixing structure is arranged on each bridge section adjacent to the river; cable-stayed cables are arranged between the fixing structures and the river-adjacent bridge sections in a sliding mode, and the river-adjacent bridge sections, the fixing structures and the cable-stayed cables are in one-to-one correspondence; one end of each overhanging structure is detachably connected to the corresponding river-adjacent bridge section, the other end of each overhanging structure is detachably connected to the corresponding cable-stayed cable, the cable-stayed cables are tensioned, so that the overhanging structures cannot move relative to the river-adjacent bridge sections, and each river-adjacent bridge section is provided with one overhanging structure; a cantilever structure is fixedly welded to the bridge section adjacent to the river, and the cantilever structure is separated from the cable-stayed cable; and the midspan section fixing frame is arranged between the two cantilever structures. The occupied construction space is effectively reduced, the erection of the bridge body can be completed without arranging a temporary support in a river channel, and the width and navigation capacity of a channel are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of municipal engineering construction, in particular to a reverse pulling construction method for a river-crossing cantilever structure. Background Art

[0002] Continuous composite steel beam bridges are widely used in various complex terrain conditions such as crossing rivers, seas, and mountains. The span is usually large and can meet the needs of crossing wide rivers, canyons and other geographical obstacles. Due to the large span and complex structure, the deadweight of long-span bridges and the loads that may be generated during construction are relatively large. In order to ensure the stability and safety of the bridge structure during construction and avoid deformation or collapse of the bridge during construction, temporary supports are needed to increase the bearing capacity of the bridge structure.

[0003] The existing temporary supports have many disadvantages, such as reducing navigation capacity and changing the water flow conditions of the river, such as flow velocity and direction, thus affecting the safety of ships in the water. On the other hand, the lateral flow of water will have a lateral impact on the temporary supports, especially during floods or in areas with turbulent water flow, where this lateral impact may be more significant. Lateral impact may cause the temporary supports to shift or deform, and in severe cases may even cause them to fail. Summary of the invention

[0004] The purpose of the present invention is to provide a reverse tension construction method for a cantilever structure across a river, which can complete the erection of a bridge body without setting up temporary supports.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The reverse tension construction method of the cantilever structure across the river includes the following steps:

[0007] S1: Build a riverside bridge section on both sides of the river;

[0008] S2: Setting a fixed structure: setting a fixed structure on each of the bridge sections facing the river;

[0009] S3: Setting up the inclined cables: the inclined cables are slidably set up between the fixed structure and the bridge section facing the river, and the bridge section facing the river, the fixed structure and the inclined cables correspond to each other one by one;

[0010] S4: pre-connecting the cantilever structure: one end of the cantilever structure is detachably connected to the bridge section facing the river, and the other end of the cantilever structure is detachably connected to the inclined cable, and the inclined cable is tensioned so that the cantilever structure cannot move relative to the bridge section facing the river, and each bridge section facing the river is equipped with one cantilever structure;

[0011] S5: Welding the cantilever structure: fixing and welding the cantilever structure to the bridge section facing the river, and separating the inclined cable from the cantilever structure;

[0012] S6: erecting the mid-span section: erecting the mid-span section between the two cantilever structures.

[0013] Preferably, in step S4, the cantilever structure is detachably connected to the riverside bridge section via a horse plate.

[0014] Preferably, the riverside bridge section comprises:

[0015] There are at least two piers;

[0016] The bridge deck is erected between the two bridge piers, and the fixed structure is located at the top of the bridge pier close to the river channel.

[0017] Preferably, the riverside bridge section further includes a plurality of foundations, wherein the foundations are buried below the ground of the river bank, and the foundations are arranged one by one at the bottom ends of the bridge piers.

[0018] Preferably, one end of the inclined cable close to the fixed structure is a connecting end, and the other end is a tensioning end, and the tensioning end is detachably provided with a plurality of counterweights.

[0019] Preferably, the counterweight block is located on the outer peripheral side of the pier away from the river channel, and is pressed against the foundation corresponding to the pier.

[0020] Preferably, in step S4, when the oblique-stayed cable is tensioned, the tension on the oblique-stayed cable can be adjusted by changing the number of the counterweight blocks.

[0021] Preferably, a first fixed pulley is provided on the bridge section facing the river, the first fixed pulley is located above the counterweight block, and the inclined cable part abuts against the edge of the first fixed pulley.

[0022] Preferably, a second fixed pulley is provided at the top end of the fixed structure, and the inclined cable portion abuts against an edge of the second fixed pulley.

[0023] Preferably, the cantilever structure is configured as a steel box girder structure.

[0024] Beneficial effects of the present invention:

[0025] The inclined cables and the fixed structure cooperate with each other to realize the installation of the cantilever structure. The construction cost is low, the solution is reliable, and the safety is high. In addition, the inclined cables and the fixed structure can be reused and have strong versatility, which effectively reduces the construction space occupied. It is especially suitable for complex terrain conditions such as crossing rivers and canyons. There is no need to set up temporary supports in the river channel to complete the erection of the bridge body, thereby ensuring the width and navigation capacity of the waterway and reducing the impact on shipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of the reverse tension construction method of the river-crossing cantilever structure of the present invention;

[0027] Figure 2 This is a diagram of the first construction process of the reverse tension construction method of the river-crossing cantilever structure of the present invention;

[0028] Figure 3 This is a diagram of the second construction process of the reverse tension construction method of the river-crossing cantilever structure of the present invention;

[0029] Figure 4 It is a diagram of the third construction process of the reverse tension construction method of the river-spanning cantilever structure described in the present invention.

[0030] In the figure:

[0031] 100. River;

[0032] 1. Bridge section facing the river; 11. Bridge piers; 12. Bridge deck; 13. Foundation;

[0033] 2. Fixed structure;

[0034] 3. Cable rope; 31. Counterweight

[0035] 4. Cantilever structure;

[0036] 5. Across the middle section. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0041] like Figure 1-Figure 4 As shown, the present invention provides a reverse tension construction method for a cantilever structure across a river, which is used for the construction of a bridge across a river. The reverse tension construction method for a cantilever structure across a river comprises the following steps:

[0042] S1: Build a riverside bridge section 1 on both sides of the river 100.

[0043] In the above steps, the common construction methods in the art may be used for construction, which are not specifically limited here.

[0044] S2: Setting a fixed structure 2: a fixed structure 2 is set on each bridge section 1 facing the river.

[0045] In the above steps, the fixed structure 2 is a steel structure commonly used in this field. It can be prefabricated according to construction requirements using an assembly process, and then hoisted to the riverside bridge section 1 using hoisting equipment for installation. While improving construction efficiency, it is more versatile and can be flexibly applied to different construction environments.

[0046] Specifically, the riverside bridge section 1 includes a bridge pier 11 and a bridge deck 12. There are at least two bridge piers 11; the bridge deck 12 is erected between the two bridge piers 11, and the fixed structure 2 is located at the top of the bridge pier 11 close to the river channel 100. With the above arrangement, the deadweight load of the fixed structure 2 can be directly transferred to the bridge pier 11 located below it, with high stability and reliable structure.

[0047] Specifically, the riverside bridge section 1 further includes a plurality of foundations 13, which are buried below the ground of the river bank and are arranged one by one at the bottom of the piers 11. The arrangement of the foundations 13 can further improve the stability and structural reliability of the riverside bridge section 1.

[0048] S3: Setting the inclined cables 3: The inclined cables 3 are slidably set between the fixed structure 2 and the riverside bridge section 1, and the riverside bridge section 1, the fixed structure 2 and the inclined cables 3 correspond to each other one by one.

[0049] In the above steps, specifically in this embodiment, the inclined cable 3 is a steel cable structure commonly used in the art.

[0050] Specifically, a first fixed pulley is provided on the riverside bridge section 1, and the first fixed pulley is located above the counterweight block 31, and the inclined cable 3 partially abuts against the edge of the first fixed pulley. The above-mentioned setting of the first fixed pulley enables the inclined cable 3 to bend and change its line at the position of the first fixed pulley to realize the subsequent inclined pulling of the cantilever structure 4; at the same time, it can reduce the friction between the inclined cable 3 and the riverside bridge section 1, and improve the durability of the inclined cable 3.

[0051] Specifically, a second fixed pulley is provided at the top of the fixed structure 2, and the inclined cable 3 partially abuts against the edge of the second fixed pulley. The above-mentioned second fixed pulley is provided so that the inclined cable 3 can be bent and changed at the position of the second fixed pulley to achieve the subsequent inclined pulling of the cantilever structure 4; at the same time, the friction between the inclined cable 3 and the fixed structure 2 can be reduced, and the durability of the inclined cable 3 can be improved.

[0052] More specifically, the edges of both the first fixed pulley and the second fixed pulley are provided with sliding grooves, and the inclined cable 3 can abut against the inner wall of the sliding groove.

[0053] Preferably, in this embodiment, an anti-skid structure is provided on the inner wall of the slide groove. The anti-skid structure may be an anti-skid pad, such as a rubber pad, or the like; or the anti-skid structure may be an anti-skid protrusion, which may be a dot-shaped protrusion or a patterned protrusion of any shape, as long as the contact friction between the position where the anti-skid protrusion is located and the inclined cable 3 can be increased. The specific form thereof is referred to the prior art and is not specifically limited in this embodiment.

[0054] Specifically, one end of the inclined cable 3 close to the fixed structure 2 is a connecting end, and the other end is a tensioning end, and the tensioning end is detachably provided with a plurality of counterweight blocks 31. The arrangement of the counterweight blocks 31 facilitates the tensioning and fixing of the cantilever structure 4 in subsequent steps, and the structure is safe and reliable, the principle is simple, the production cost is low, and the versatility is strong.

[0055] In other embodiments, other tensioning devices in the art may be used instead of the counterweight 31, which is not specifically limited here.

[0056] More specifically, the counterweight 31 is located on the outer peripheral side of the pier 11 away from the river channel 100, and is pressed against the foundation 13 corresponding to the pier 11. The above arrangement enables the deadweight load of the counterweight 31 to be transmitted to the foundation 13 corresponding to the pier 11 along the extension direction of the pier 11, so that the force of the entire structure is more balanced, thereby improving the structural stability and durability.

[0057] S4: Pre-connected cantilever structure 4: One end of the cantilever structure 4 is detachably connected to the riverside bridge section 1, and the other end of the cantilever structure 4 is detachably connected to the inclined cable 3, and the inclined cable 3 is tensioned so that the cantilever structure 4 cannot move relative to the riverside bridge section 1. Each riverside bridge section 1 is equipped with a cantilever structure 4.

[0058] In the above steps, the cantilever structure 4 is first hoisted to the bridge deck 12 of the river-facing bridge section 1 using mechanical hoisting equipment; then the cantilever structure 4 is detachably connected to the river-facing bridge section 1 using a horse plate; the above-mentioned horse plate structure is a commonly used existing technology in this field, and its specific structure and principle are not repeated here; when tensioning the inclined cable 3, the tension on the inclined cable 3 can be adjusted by changing the number of counterweight blocks 31, so that the deadweight load of the cantilever structure 4 is fully applied to the river-facing bridge section 1 and the inclined cable 3.

[0059] It is understandable that the riverside bridge sections 1 located on both sides of the river channel 100 can be constructed at the same time, and the cantilever structures 4 can be assembled at the same time to improve the construction efficiency. The number of counterweights 31 can be adjusted to adjust the tension on the inclined cable 3, thereby adjusting the angle of the cantilever structure 4, so that the two cantilever structures 4 can be aligned for subsequent construction steps.

[0060] Preferably, in this embodiment, the cantilever structure 4 is configured as a steel box girder structure.

[0061] S5: Welding the cantilever structure 4: Fixing and welding the cantilever structure 4 to the bridge section 1 facing the river, and separating the inclined cable 3 from the cantilever structure 4.

[0062] For the specific process of welding the cantilever structure 4, reference may be made to commonly used welding techniques in the art or construction cases of similar working conditions, which will not be described in detail here.

[0063] S6: erecting the mid-span section 5: erecting the mid-span section 5 between the two cantilever structures 4.

[0064] In the above steps, mechanical lifting equipment can be used to first lift the mid-span section 5 between the two cantilever structures 4, and then the two ends of the mid-span section 5 can be welded to the two cantilever structures 4 one by one. The specific process can refer to the publicly available prior art or construction cases of similar working conditions, which will not be repeated here.

[0065] The inclined cable 3 and the fixed structure 2 cooperate with each other to realize the installation of the cantilever structure 4, with low construction cost, reliable solution and high safety. In addition, the inclined cable 3 and the fixed structure 2 can be reused, and have strong versatility, which effectively reduces the construction space occupation. It is particularly suitable for complex terrain conditions such as crossing rivers and canyons. There is no need to set up temporary supports in the river channel 100 to complete the erection of the bridge body, thereby ensuring the width and navigation capacity of the waterway and reducing the impact on shipping.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. 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 claims of the present invention.

Claims

1. The reverse tension construction method of the cantilever structure across the river is characterized by: The following steps are involved: S1: Build a riverside bridge section (1) on both sides of the river (100); S2: Setting a fixed structure (2): setting a fixed structure (2) on each of the bridge sections (1) facing the river; S3: Arranging the inclined cable (3): the inclined cable (3) is slidably arranged between the fixed structure (2) and the riverside bridge section (1), and the riverside bridge section (1), the fixed structure (2) and the inclined cable (3) correspond to each other one by one; S4: pre-connecting the cantilever structure (4): one end of the cantilever structure (4) is detachably connected to the riverside bridge section (1), the other end of the cantilever structure (4) is detachably connected to the inclined cable (3), and the inclined cable (3) is tensioned so that the cantilever structure (4) cannot move relative to the riverside bridge section (1), and each riverside bridge section (1) is equipped with one cantilever structure (4); S5: welding the cantilever structure (4): fixing and welding the cantilever structure (4) to the riverside bridge section (1), and separating the inclined cable (3) from the cantilever structure (4); S6: erecting the mid-span section (5): fixedly erecting the mid-span section (5) between the two cantilever structures (4).

2. The reverse tension construction method of a river-crossing cantilever structure according to claim 1, characterized in that: In the step S4, the cantilever structure (4) is detachably connected to the riverside bridge section (1) via a saddle board.

3. The reverse tension construction method of a river-crossing cantilever structure according to claim 1, characterized in that: The riverside bridge section (1) comprises: The bridge piers (11) are provided with at least two; The bridge deck (12) is erected between the two bridge piers (11), and the fixed structure (2) is located at the top of the bridge pier (11) close to the river channel (100).

4. The reverse tension construction method of a river-crossing cantilever structure according to claim 3 is characterized in that: The riverside bridge section (1) further comprises a plurality of foundations (13), wherein the foundations (13) are buried below the ground surface of the river bank, and the foundations (13) are arranged one by one at the bottom ends of the bridge piers (11).

5. The reverse tension construction method of a river-crossing cantilever structure according to claim 4 is characterized in that: One end of the inclined cable (3) close to the fixed structure (2) is a connecting end, and the other end is a tensioning end, and the tensioning end is detachably provided with a plurality of counterweight blocks (31).

6. The reverse tension construction method of a river-crossing cantilever structure according to claim 5 is characterized in that: The counterweight block (31) is located on the outer peripheral side of the bridge pier (11) away from the river channel (100), and is pressed against the foundation (13) corresponding to the bridge pier (11).

7. The reverse tension construction method of a river-crossing cantilever structure according to claim 5, characterized in that: In the step S4, when the inclined cable (3) is tensioned, the tension on the inclined cable (3) can be adjusted by changing the number of the counterweight blocks (31).

8. The reverse tension construction method of a river-crossing cantilever structure according to claim 5, characterized in that: The riverside bridge section (1) is provided with a first fixed pulley, the first fixed pulley is located above the counterweight block (31), and the inclined cable (3) partially abuts against the edge of the first fixed pulley.

9. The reverse tension construction method for a river-crossing cantilever structure according to any one of claims 1 to 8, characterized in that: A first fixed pulley is provided at the top end of the fixed structure (2), and a portion of the inclined cable (3) abuts against an edge of the first fixed pulley.

10. The reverse tension construction method for a river-crossing cantilever structure according to any one of claims 1 to 8, characterized in that: The cantilever structure (4) is configured as a steel box girder structure.

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