A construction method for constructing concrete box girder segments of cable-stayed bridges using guy-cable hanging basket

Abstract

The present application discloses a construction method for using a cable-stayed bridge concrete box girder segment to construct a cable-stayed bridge, and relates to the field of cable-stayed bridge concrete box girder segment construction, which includes the following steps: S1, installing a hanging basket lifting truss, and lifting the cable hanging basket to the design elevation through the hanging basket lifting truss; S2, installing a temporary connecting steel beam on the middle cross beam of the main tower, and connecting the cable hanging basket with the temporary connecting steel beam; S3, installing the hanging basket inclined cable and tensioning it to the design value; S4, removing the hanging basket lifting truss, and using the cable hanging basket to construct the concrete box girder segment; S5, installing the box girder inclined cable and tensioning it to the design value; S6, connecting the cable hanging basket to the concrete box girder, removing the temporary connecting steel beam, adjusting the box girder inclined cable to the design value, and constructing the next concrete box girder segment with the cable hanging basket. The present application has the effect of reducing construction risks, saving construction costs, and accelerating construction progress.

Description

Technical Field

[0001] The invention relates to the field of cable-stayed bridge concrete box girder segment construction, and in particular to a construction method for cable-stayed bridge concrete box girder segment construction by adopting a guy wire hanging basket. Background Art

[0002] When constructing the 0# and 1# sections of the concrete box girder in a cable-stayed bridge, the conventional method is to use the corbel support method.

[0003] like Figures 1 to 3 The steps of the corbel support method are as follows:

[0004] When constructing the middle cross beam 02 of the main tower 01, the embedded parts are installed, and the bracket 03 is installed by the main tower crane and welded to the embedded parts;

[0005] Install the casting formwork on the corbel 03 and construct the concrete box girder 04 segment;

[0006] When the concrete reaches the designed strength, the longitudinal and transverse prestressing of the concrete box girder 04 is tensioned, the inner inclined cables are installed, and the brackets 03 are manually removed;

[0007] Install the guy rope hanging basket lifting equipment and lift the guy rope hanging basket to the designed elevation;

[0008] After the hanging basket is installed, the anchor structure is installed and tensioned to the design value for the external inclined cables. The cable hanging basket is connected to the concrete box girder 04 and the next section of the concrete box girder 04 is constructed.

[0009] After the construction of the concrete box girder segment is completed, the corbel is located below the concrete box girder segment and is blocked by the concrete box girder. Construction equipment such as tower cranes cannot assist in the removal of the corbel and can only be removed manually on site. The removal risk is high, the construction efficiency is low, the construction progress is slow, and it has a great impact on the subsequent installation of the guying basket. Summary of the invention

[0010] In order to reduce construction risks and improve construction efficiency, the present application provides a construction method for constructing concrete box girder segments of a cable-stayed bridge using a guy-cable hanging basket.

[0011] The present application provides a construction method for constructing a cable-stayed bridge concrete box girder segment using a guy wire hanging basket, which adopts the following technical solution:

[0012] A construction method for constructing a concrete box girder segment of a cable-stayed bridge using a guy-cable hanging basket comprises the following steps:

[0013] S1. Install the basket lifting truss, and lift the guy rope basket to the designed elevation through the basket lifting truss;

[0014] S2. Install a temporary connecting steel beam on the middle cross beam of the main tower and connect the guy rope hanging basket to the temporary connecting steel beam;

[0015] S3. Install the hanging basket inclined cable and tension it to the design value;

[0016] S4, dismantle the hanging basket lifting truss, and use the guy rope hanging basket to construct the concrete box beam segment;

[0017] S5. Install the box girder cable and tension it to the design value;

[0018] S6. Connect the cable basket to the concrete box girder, remove the temporary connecting steel beam, adjust the box girder inclined cables to the design value, and construct the next concrete box girder segment with the cable basket.

[0019] By adopting the above technical solution, the guy wire basket is installed in advance and used to construct the 0# and 1# sections of the concrete box girder, breaking the inertial thinking. The guy wire basket originally used for the construction of subsequent sections of the concrete box girder is used for the construction of the 0# and 1# sections of the box girder, and the corbel brackets used in the construction of the 0# and 1# sections of the concrete box girder of the cable-stayed bridge are eliminated, saving the time for the installation and pre-stressing of the corbel brackets, reducing a large amount of structural investment in construction, reducing construction costs, optimizing construction procedures, and improving the utilization rate of construction equipment. It has significant advantages in reducing construction risks, saving construction costs, and accelerating construction progress in the project.

[0020] Preferably, in step S1, a first embedded frame is installed in the main tower during the construction of the main tower, and the hanging basket lifting truss is connected to the main tower through the first embedded frame.

[0021] By adopting the above technical solution, the connection between the hanging basket lifting truss and the middle cross beam is achieved, and the connection is highly stable.

[0022] Preferably, a lifting jack is installed on the lifting truss of the hanging basket, and the output end of the lifting jack is connected to a steel strand, and the bottom end of the steel strand is connected to the guy wire hanging basket.

[0023] By adopting the above technical solution, the connection between the guy wire basket and the basket lifting truss is achieved, and the jack is started to drive the guy wire basket upward.

[0024] Preferably, in step S6, the guy rope basket is connected to the concrete box girder segment via a basket rear anchor system.

[0025] By adopting the above technical solution, after the guying basket is connected to the concrete box girder segment through the rear anchor system, the construction workers can dismantle the basket lifting truss.

[0026] Preferably, in step S2, a second embedded frame is provided on the main tower, and the temporary connecting steel beam is connected to the second embedded frame.

[0027] By adopting the above technical solution, when constructing the main tower, the second embedded frame in the main tower is constructed at the same time to provide a foundation for the connection of the temporary connecting steel beam, thereby ensuring the stability of the connection of the temporary connecting steel beam.

[0028] Preferably, a construction platform is provided on the guy wire basket, and a space is reserved between the construction platform and the lower surface of the concrete box beam for the temporary connection steel beam to be moved; in step S6, when dismantling the temporary connection steel beam, the connection between the temporary connection steel beam and the guy wire basket is first released, and then the temporary connection steel beam is pulled to the construction platform of the guy wire basket by the equipment, and then the temporary connection steel beam is suspended from the cantilevered end of the guy wire basket to the ground.

[0029] By adopting the above technical solution, construction workers dismantle the connection between the guy wire basket and the temporary connection steel beam on the guy wire basket. Due to the limitation of the main tower, it is difficult to move the temporary connection steel beam out from both ends of the middle cross beam. The construction platform on the guy wire basket provides an operating space for the movement of the temporary connection steel beam, which is beneficial to the movement and lifting of the temporary connection steel beam after its removal.

[0030] Preferably, the temporary connection steel beam comprises a plurality of steel beam units, and any two adjacent steel beam segments are compressed and connected by a high-strength bolt group;

[0031] In step S6, the temporary connection steel beam is split into a plurality of steel beam units and then the steel beam units are hoisted.

[0032] By adopting the above technical solution, the temporary connecting steel beam is split into multiple steel beam units on the construction platform of the cable hanging basket, and then different steel beam units are hoisted separately, which reduces the difficulty of hoisting.

[0033] Preferably, a beam transport track is provided on the construction platform.

[0034] By adopting the above technical solution, the setting of the beam transport track is conducive to the movement of the temporarily connected steel beam on the construction platform of the cable hanging basket, thereby reducing the occurrence of displacement of the temporarily connected steel beam during the movement.

[0035] Preferably, a winch is provided on the construction platform, and the winch is connected to the temporary connecting steel beam through a steel wire rope.

[0036] By adopting the above technical solution, the temporary connecting steel beam is pulled to the side away from the middle cross beam through the cooperation of the winch and the wire rope, thereby realizing the movement of the temporary connecting steel beam on the construction platform of the cable hanging basket.

[0037] In summary, the present application includes at least one of the following beneficial technical effects:

[0038] 1. The guy-cable hanging basket originally used for the construction of subsequent sections of the concrete box girder was used for the construction of the 0# and 1# sections of the box girder, which improved the utilization rate of the construction equipment and had significant advantages in reducing construction risks, saving construction costs and accelerating the construction progress of the project;

[0039] 2. The brackets used in the construction of the 0# and 1# sections of the cable-stayed bridge concrete box girders were eliminated, saving the time for the installation and pre-stressing of the brackets, reducing a large amount of structural investment in the construction and lowering the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the state of constructing a concrete box girder segment on a corbel in the background technology.

[0041] Figure 2 It is a schematic diagram of the state of installing a guy rope hanging basket in the background technology.

[0042] Figure 3 It is a schematic diagram of the state of connecting the guy rope hanging basket and the concrete box beam in the background technology.

[0043] Figure 4 It is a schematic diagram of the state of installing and lifting the guy rope hanging basket in the first embodiment.

[0044] Figure 5 It is a schematic diagram of the state of installing the temporary connecting steel beam in the first embodiment.

[0045] Figure 6 It is a schematic diagram of the state of pouring concrete box girder segments in Example 1.

[0046] Figure 7 It is a schematic diagram of the state of the tensioned concrete box girder in the first embodiment.

[0047] Figure 8 It is a schematic diagram of the state of removing the temporary connecting steel beam in the first embodiment.

[0048] Fig. 9 It is a structural schematic diagram of the main tower and the concrete box girder in the first embodiment.

[0049] Fig.10 It is a schematic diagram of the state of the temporary connection between the steel beam and the concrete box beam in the second embodiment.

[0050] Fig.11 It is a schematic diagram of the state in which the concrete box beam is hidden in the second embodiment to show the removal of the temporary connecting steel beam.

[0051] Description of reference numerals:

[0052] 01. Main tower; 011. First embedded frame; 012. Second embedded frame; 02. Middle cross beam; 03. Corbel; 04. Concrete box beam; 1. Hanging basket lifting truss; 11. Lifting jack; 12. Steel strand; 2. Temporary rope; 3. Guying rope hanging basket; 31. Construction platform; 32. Beam transport track; 4. Temporary connecting steel beam; 41. Steel beam unit; 5. Hanging basket inclined cable; 6. Box beam inclined cable; 7. Rear anchor structure. DETAILED DESCRIPTION

[0053] The following is combined with Figure 4-11 This application is described in further detail.

[0054] Embodiment 1

[0055] The present application discloses a construction method for a cable-stayed bridge concrete box girder segment using a guy wire hanging basket, combined with Figure 4-Figure 9 , including the following steps:

[0056] S1. Install and lift the guy rope basket 3:

[0057] When constructing the main tower 01, the first embedded frames 011 are installed in the main tower 01, so that four groups of the first embedded frames 011 are arranged in a rectangular shape on the outer walls of both sides of the main tower 01;

[0058] Use the main tower 01 construction tower crane to hoist and install the hanging basket lifting truss 1, connect the hanging basket lifting truss 1 with the first embedded frame 011, and after the connection is completed, tension the temporary cable 2;

[0059] The guy wire basket 3 is lifted to the designed elevation using the basket lifting truss 1 .

[0060] Among them, multiple lifting jacks 11 are installed on the basket lifting truss 1, and the output end of the lifting jack 11 is connected to the steel strand 12. The bottom ends of the multiple steel strands 12 are connected to the cable hanging basket 3. In this step, the lifting of the cable hanging basket 3 is achieved by the cooperation of the lifting jacks 11 and the steel strands 12.

[0061] S2. Install temporary connecting steel beam 4:

[0062] When constructing the main tower 01, first install the second embedded frame 012 in the main tower 01;

[0063] Then, a temporary connection steel beam 4 for temporary connection of the guy wire hanging basket 3 is installed on the middle cross beam 02 of the main tower 01, the bottom end of the temporary connection steel beam 4 is placed on the middle cross beam 02, and both ends of the temporary connection steel beam 4 are connected and fixed to the second embedded frame 012 on the main tower 01, and then the guy wire hanging basket 3 is connected and fixed to the temporary connection steel beam 4, and then the hanging basket inclined cable 5 is installed and tensioned to the design value. In this embodiment, the fixing method between the guy wire hanging basket 3 and the temporary connection steel beam 4 can be selected by welding, high-strength bolt connection or a combination of the two according to the specific conditions on site.

[0064] S3, pouring concrete box girder section 04:

[0065] After removing the guy wire basket 3 to lift the truss and pre-stressing the guy wire basket 3 to ensure the supporting strength of the guy wire basket 3, the guy wire basket 3 is used to cast and construct the 0# and 1# sections of the concrete box girder 04. The guy wire basket 3 used for the construction of subsequent sections of the concrete box girder 04 is used for the construction of the 0# and 1# sections of the box girder, thereby improving the utilization rate of the construction equipment and avoiding the construction risks caused by manual dismantling.

[0066] S4, tensioned concrete box girder 04:

[0067] After the 0# and 1# sections of the concrete box girder 04 reach the design strength, the longitudinal and transverse prestressing of the concrete box girder 04 is tensioned, and the box girder inclined cables 6 are installed between the main tower 01 and the concrete box girder 04. The cable force of the box girder inclined cables 6 is tensioned to the design value, and the tensioning construction of the 0# and 1# sections of the concrete box girder 04 is completed.

[0068] S5. Dismantle temporary connecting steel beam 4:

[0069] Install the rear anchor structure 7 for connecting the guy wire basket 3 and the concrete box girder 04 to achieve the connection between the guy wire basket 3 and the concrete box girder 04, and prepare for the subsequent movement and construction of the guy wire basket 3; after the guy wire basket 3 is connected, cut off the connection between the temporary connection steel beam 4 and the main tower 01, remove the temporary connection steel beam 4, adjust the basket inclined cable 5 to make it tensioned to the design value, and use the guy wire basket 3 to construct the next stage of concrete box girder 04.

[0070] The present embodiment discloses a construction method for constructing concrete box girder segments of a cable-stayed bridge using a cable-hanging basket, which eliminates the corbel 03 used in the construction of the 0# and 1# segments of the concrete box girder 04, saves the time for installing and pre-stressing the corbel 03, reduces a large amount of structural investment in construction, and reduces construction costs. In addition, by installing the cable-hanging basket 3 used for the construction of subsequent segments in advance and using it for the construction of the 0# and 1# segments of the concrete box girder 04, the construction process is optimized, the utilization rate of the construction equipment is improved, and it has significant advantages in reducing construction risks, saving construction costs, and accelerating construction progress in the project.

[0071] Embodiment 2

[0072] Combination Fig.10 and Fig.11 A construction method for a cable-stayed bridge concrete box girder segment using a guy-cable hanging basket is different from the first embodiment in that the temporary connection steel beam 4 includes a plurality of steel beam units 41 connected in sequence. In the present embodiment, any two adjacent steel beam units 41 are welded and fixed or compressed and connected by a high-strength bolt group.

[0073] A construction platform 31 is provided on the guy wire hanging basket 3 , and a space for moving the temporary connecting steel beam 4 is reserved between the construction platform 31 and the lower surface of the concrete box beam 04 . A beam transport track 32 for moving the temporary connecting steel beam 4 is provided on the construction platform 31 .

[0074] In step S2, when installing the temporary connecting steel beam 4, first hang the steel beam units 41 at both ends onto the middle cross beam 02, move the steel beam units 41 at both ends to connect with the second embedded frame 012, fix the steel beam units 41 at both ends to the second embedded frame 012, and then hang and fix the steel beam unit 41 in the middle to facilitate the temporary connecting steel beam 4 to be connected with the second embedded frame 012.

[0075] In step S6, when dismantling the temporary connection steel beam 4, first release the connection between the temporary connection steel beam 4 and the cable hanging basket 3 and between the temporary connection steel beam 4 and the main tower 01, and then pull the temporary connection steel beam 4 to the beam transport track 32 of the construction platform 31 through the cooperation of the winch and the wire rope. After the temporary connection steel beam 4 is moved into place, the temporary connection steel beam 4 is split into multiple steel beam units 41, and finally the temporary connection steel beam 4 is hoisted to the ground from the cantilevered end of the cable hanging basket 3.

[0076] The temporary connecting steel beam 4 is set as a plurality of steel beam units 41, so as to facilitate the installation, dismantling and hanging of the temporary connecting steel beam 4; and the temporary unit is pulled onto the construction platform 31 of the guy wire hanging basket 3, and the original equipment is used to assist the movement of the temporary connecting steel beam 4, which provides an effective reference for subsequent similar projects.

[0077] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction method for constructing a concrete box girder segment of a cable-stayed bridge using a guy wire hanging basket, characterized in that: The following steps are involved: S1, installing a hanging basket lifting truss (1), and lifting the guy rope hanging basket (3) to a designed elevation through the hanging basket lifting truss (1); S2. Install a temporary connecting steel beam (4) on the middle cross beam (02) of the main tower (01), and connect the guy wire hanging basket (3) to the temporary connecting steel beam (4); S3, installing the hanging basket inclined cable (5) and tensioning it to the design value; S4, dismantling the hanging basket lifting truss (1), and using the guy rope hanging basket (3) to construct the concrete box beam (04) segment; S5, installing the box girder stay cables (6) and tensioning them to the design value; S6, connecting the guy wire basket (3) to the concrete box girder (04), removing the temporary connecting steel beam (4), adjusting the box girder inclined cable (6) to the design value, and constructing the next concrete box girder (04) segment on the guy wire basket (3); In the step S6, when the temporary connection steel beam (4) is removed, the connection between the temporary connection steel beam (4) and the cable hanging basket (3) is first released, and then the temporary connection steel beam (4) is pulled onto the construction platform (31) of the cable hanging basket (3) by means of equipment, and then the temporary connection steel beam (4) is suspended from the cantilevered end of the cable hanging basket (3) to the ground.

2. The method for constructing a cable-stayed bridge concrete box girder segment using a guy-cable hanging basket according to claim 1, characterized in that: In the step S1, a first embedded frame (011) is installed in the main tower (01) during the construction of the main tower (01), and the hanging basket lifting truss (1) is connected to the main tower (01) through the first embedded frame (011).

3. The construction method of a cable-stayed bridge concrete box girder segment using a guy-cable hanging basket according to claim 1, characterized in that: A lifting jack (11) is installed on the hanging basket lifting truss (1), the output end of the lifting jack (11) is connected to a steel strand (12), and the bottom end of the steel strand (12) is connected to the guy wire hanging basket (3).

4. The method for constructing a cable-stayed bridge concrete box girder segment using a guy-cable hanging basket according to claim 1, characterized in that: In step S6, the guy rope cradle (3) is connected to the concrete box girder (04) segment via the cradle rear anchor system.

5. The method for constructing a cable-stayed bridge concrete box girder segment using a guy-cable hanging basket according to claim 4, characterized in that: The main tower (01) is provided with a second embedded frame (012), and the temporary connection steel beam (4) is connected to the second embedded frame (012).

6. The method for constructing a cable-stayed bridge concrete box girder segment using a guy-cable hanging basket according to claim 1, characterized in that: The temporary connection steel beam (4) comprises a plurality of steel beam units (41), and any two adjacent steel beam segments are compressed and connected by a high-strength bolt group; In step S6, the temporary connection steel beam (4) is split into a plurality of steel beam units (41) and then the steel beam units (41) are hoisted.

7. The method for constructing a cable-stayed bridge concrete box girder segment using a guy-cable hanging basket according to claim 1, characterized in that: The construction platform (31) is provided with a beam transport track (32).

8. The method for constructing a cable-stayed bridge concrete box girder segment using a guy-cable hanging basket according to claim 1, characterized in that: A winch is provided on the construction platform (31), and the winch is connected to the temporary connection steel beam (4) via a steel wire rope.

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