Method for constructing ultra-high main tower of cable stayed bridge

Abstract

A method of constructing a tower of a cable-stayed bridge comprises the steps of: pouring a starting segment of a tower pillar on a bridge pier 1; using outwardly inclined climbing formwork structures

Description

[0001] The present application relates to a field of a construction for a main tower of a cable stayed bridge, and in particular, to a method for constructing an ultra-high main tower of a cable stayed bridge. BACKGROUND ART

[0002] The cable stayed bridge is a type of bridge that a plurality of cables is directly pulled in the bridge, and is a structure system composed by a tower configured for bearing pressure, a cable configured for being pulled and a beam configured for bearing bending. The main tower of the cable stayed bridge mostly is a reinforced concrete tower. The tower is H-shaped, inverted Y-shaped, A-shaped and vase-shaped and so on.

[0003] The existing vase-shaped ultra-high main tower structure is sequentially composed of a bridge pier, a lower tower pillar, a lower beam, a middle tower pillar, an upper beam and an upper tower pillar from bottom to top, two lower tower pillars are respectively arranged on two sides of upper surface of the bridge pier, the beam extends and connected to the top end of two lower tower pillars, and two middle tower pillars are respectively poured on the top end of the two lower tower pillars. The existing tower pillars are constructed by a hydraulic self-climbing formwork, the energy source of the hydraulic self-climbing formwork is own hydraulic lifting system including a hydraulic cylinder and an upper and lower reserving box, the reserving box can be configured to control and lift the guide rail or lift the frame, the formwork frame and the guide rail can form a mutual climbing by the hydraulic system, thereby lifting the hydraulic self-climbing formwork.

[0004] There is following disadvantages in the above existing technology: two tower pillars are respectively constructed and tilts outwards, the hydraulic self-climbing system has a plurality of elements and is heavy weight, and during the pouring, the self-weight of the climbing formwork and the load from the construction significantly affect the tower body of the tower pillar, which is prone to causing the structural change in the tower body structure, and exists a safety problem, so there is some improvements for the existing technology. SUMMARY

[0005] In order to reduce an adverse influence for a tower body during a construction, a method for constructing an ultra-high main tower of a cable stayed bridge according to the present application is disclosed.

[0006] The method for constructing the ultra-high main tower of the cable stayed bridge according to the present application adopts following solution:

[0007] The method for constructing the ultra-high main tower of the cable stayed bridge, including following steps:

[0008] step 1: pouring for a starting segment of two lower tower pillars: building a formwork of a starting segment of two lower tower pillars on a bridge pier, pouring in the formwork to form the starting segment of the two lower tower pillars, and after the starting segment of the lower tower pillar is poured and formed, removing the formwork;

[0009] step 2: pouring and climbing formwork for the two lower tower pillars: assembling a climbing formwork structure around a periphery of the starting segment of each of the two lower tower pillars, wherein a pouring cavity is formed by each of the two climbing formwork structures on a top of the starting segment of each of the two lower tower pillars ; arranging a truss on top of each of the two climbing formwork structures, wherein the top of each of the two climbing formwork structures are respectively slidably connected to a bottom of the truss, a sliding direction of the two climbing formwork structures is consistent with a length direction of the truss, and the two climbing formwork structures are inclined respectively towards an outer side of a corresponding one of the two lower tower pillars; forming a new segment for each of the two lower tower pillars by pouring in each of the pouring cavities; lifting the truss, such that the truss drives the two climbing formwork structures to move to a construction portion of next segments of the two lower tower pillars for pouring, and repeating the above steps until construction of the two lower tower pillars is completed;

[0010] step 3: pouring for a lower beam: after completing the construction of the two lower tower pillars, lifting the truss until the two climbing formwork structures are separated from the two lower tower pillars; building a construction platform between the two lower tower pillars; and completing pouring construction of the lower beam on tops of the two lower tower pillars;

[0011] step 4: pouring and climbing formwork for two middle tower pillars: completing the construction of a starting segment of each of the two middle tower pillars on a top of the lower beam; reassembling the two climbing formwork structures and the truss; exchanging portions of the two climbing formwork structures on two ends of the truss, such that the two climbing formwork structures are inclined respectively towards an inner side of a corresponding one of the two middle tower pillars; mounting the two climbing formwork structures at the two ends of the truss on the starting segments of each of the two middle tower pillars, wherein a pouring cavity is provided on a top of each of the starting segments of each of the two middle tower pillars; forming a new segment of each of the two middle tower pillars by pouring in the pouring cavities; lifting the truss such that the truss drives the two climbing formwork structures to move to a construction portion of next segment of the two middle tower pillars for pouring; repeating the above steps until a construction of the two middle tower pillars is completed;

[0012] step 5: pouring for a upper beam: building a construction platform on the lower beam, and completing a pouring construction of the upper beam on tops of the two middle tower pillars; and

[0013] step 6: pouring and climbing formwork for two upper tower pillars: completing a construction of the two upper tower pillars on the upper beam.

[0014] By adopting the above technical solution, the two climbing formwork structures are connected to each other by the truss, the climbing formwork structures are lifted by lifting the truss, the truss shares the weight of the climbing formwork structure and reduces the load of the tower pillar, and when the tower pillar shows a downward trend, the truss can play a pulling role, which is conducive to reducing a bad influence for the tower body during the construction. A hydraulic-pressure climbing formwork is replaced by the upward lifting, which can increase the lifting spade of the climbing formwork, and is conducive to improving the construction efficiency of the climbing formwork.

[0015] Preferably, each of the two climbing formwork structures comprises a first supporting platform, four side formworks and four driving components; a first through groove is provided in middle of the first supporting platform, the four side formworks are slidably connected to an upper surface of the first supporting platform and are arranged around a periphery of the first through groove; the four driving components one by one corresponds to the four side formworks, wherein each of the four driving components is configured to drive a corresponding one of the four side form works to move towards or away from the first through groove; and during pouring the two lower tower pillars , each of the starting segments of each of the two lower tower pillars passes through the first through groove, each driving component drives the corresponding one of the four side formworks to move towards the first through groove until an inner side of each of the four side formworks abuts against an outer wall of the starting segments of the lower tower pillars; and the pouring cavity is formed by the four side formworks on the starting segments of the two lower tower pillars .

[0016] By adopting the above technical solution, the first through groove plays a locating and guidance role for the climbing formwork structure, the side formwork driven by the corresponding driving component is stability moved and abuts on the outer wall of the starting segment of the lower tower pillar, thereby forming a pouring cavity, which is conducive to pouring on the upper end of the starting segment of the lower tower pillar.

[0017] Preferably, each of the two climbing form work structures further comprises a second supporting platform located under the first supporting platform, a second through groove is provided in middle of the second supporting platform, the first supporting platform is connected to the second supporting platform with a plurality of connecting bars, and an operating platform is formed between the first supporting platform and the second supporting platform.

[0018] By adopting the above technical solution, a construction platform is provided on a space between the first supporting platform and the second supporting platform, which can be used for the constructor constructing the surface of the tower pillar.

[0019] Preferably, the step 2 of pouring and climbing formwork for the two lower tower pillars comprises: fixing a guide rail on an outer wall of the starting segment of each of the two lower tower pillars, wherein a length direction of the guide rail is consistent with an extending direction of the lower tower pillar, a guide block is provided on an inner side wall of the second through groove, the guide block is slidably connected to the guide rail; and after the climbing formwork structure rises a segment each time, the guide rail is mounted on the outer wall of the segment of the poured lower tower pillar on the construction platform of the climbing formwork structure, thereby completing the extending step of the guide rail.

[0020] By adopting the above solution, the guide rail plays a guidance role, such that the climbing formwork structure can move along the extending direction of the tower pillar, which is conducive to improving the straightness of the climbing formwork structure, and reducing the construction deviation.

[0021] Preferably, a T-shaped groove extends along a length direction of the truss is provided on a bottom of the truss, a connecting pillar is vertically provided on an upper end surface of the first supporting platform, a T-shaped block slidably connected in the T-shaped groove is provided with a top end of the connecting pillar.

[0022] By adopting the above solution, the moving stability of the climbing formwork structure is improved on the truss.

[0023] Preferably, the T-shaped groove is in communication with an end of the truss.

[0024] The above technical solution is conducive to detaching the climbing formwork structure and the truss, and the portions of the two climbing formwork structures are convenience to be exchanged with each other during the pouring for the upper beam in step 5.

[0025] Preferably, before the truss is lifted, the opening of an end of the T-shaped grooved is blocked.

[0026] By adopting the above technical solution, the possibility of detaching the climbing formwork structure from the high altitude can be reduced during the pouring for the tower pillar, which is conducive to improving the construction safety.

[0027] Preferably, each driving component is a hydraulic cylinder, a first end of the hydraulic cylinder is connected to the first supporting platform with hinge joint, a second end of the hydraulic cylinder away from the first supporting platform is connected to a dovetail block with a hinge joint, a dovetail groove is provided on an outer side wall of the side formwork, the dovetail groove vertically extends, and the dovetail block is slidably connected in the dovetail groove.

[0028] By adopting the above solution, each driving component can pull and draw the side formwork, which improves the efficiency of assembling and detaching of the climbing form work structure.

[0029] In summary, the present application realizes at least one of the following beneficial technical effectives:

[0030] 1. two climbing formwork structures are connected to each other by the truss, the climbing formwork structures are lifted by lifting the truss, the truss shares the weight of the climbing formwork structure and reduces the load of the tower pillar, and when the tower pillar shows a downward trend, the truss can play a pulling role, which is conducive to reducing a bad influence for the tower body during the construction. A hydraulic-pressure climbing formwork is replaced by the upward lifting, which can increase the lifting spade of the climbing formwork, and is conducive to improving the construction efficiency of the climbing formwork; and

[0031] 2.during the pouring and climbing formwork structure for the middle tower pillar, a starting segment of the middle tower pillar is constructed on the top of the lower beam, then the climbing formwork structure and the truss are reassembled, the portion of the climbing formwork of two ends of the truss, such that tilt directions of the two climbing formwork structures are respectively pointed at the inner side of the middle tower pillar, which is conducive to changing the angle of the construction of the tower pillar, and improves the flexibly of the construction.. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG. 1 is a schematic structural diagram of a main tower in a method for constructing an ultra-high main tower of a cable stayed bridge according to Embodiment 1 in the present application.

[0033] FIG. 2 is a schematic view of a lower tower pillar during construction in a method for constructing an ultra-high main tower of a cable stayed bridge according to Embodiment 1 in the present application.

[0034] FIG. 3 is an enlarged view of A portion of FIG. 2.

[0035] FIG. 4 is a schematic view of a structure between a climbing formwork structure and a truss in a method for constructing an ultra-high main tower of a cable stayed bridge according to Embodiment 1 in the present application. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in communication with reference to FIGs.1-4.

[0037] A method for constructing an ultra-high main tower of a cable stayed bridge according to embodiments in the present application is disclosed. A method for constructing in the present application takes a vase-shaped main tower as a main construction, referring to FIG. 1, the structure of the main tower is sequentially composed of a bridge pier 1, a lower tower pillar 2, a lower beam 3, a middle tower pillar 4, an upper beam 5 and an upper tower pillar 6; particularly the two lower tower pillars 2 are arranged on two sides of the upper surface of the bridge pier 1 and tilt outward. The lower beam 3 extends and connected to the top end of the two lower tower pillars 2, and the two middle tower pillars 4 are respectively poured in the top end of the two tower pillars 2 and extend upward; particularly the two middle tower pillars 4 both tilt inward. The upper beam 5 extend and connected to the top ends of the two middle tower pillars 4, and the two upper tower pillars 6 are respectively poured in the top end of the middle tower pillars 4; particularly the height of the upper tower pillars 6 are relatively low.

[0038] The method for constructing the ultra-high main tower of the cable stayed bridge includes following steps:

[0039] step 1: pouring for a starting segment of two lower tower pillars 2: building a formwork of a starting segment of two lower tower pillars 2 on a bridge pier 1, pouring in the formwork to form the starting segment of the two lower tower pillars 2, and after the starting segment of the lower tower pillar 2 is poured and formed, removing the formwork, thereby supplying a mounting space for a climbing formwork structure 7.

[0040] step 2: pouring and climbing form work for the two lower tower pillars 2: assembling a climbing formwork structure 7 on a periphery of a starting segment of each of the two tower pillars 2, respectively.

[0041] Referring to FIG. 2-3, in particular, the climbing formwork structure 7 includes a first supporting platform 73, a second supporting platform 74, four side formworks 71 and four driving components. In particular, each driving component is a hydraulic cylinder 72. The first supporting platform 73 and the second supporting platform 74 are respectively arranged up and down and connected to each other via a connecting bar 75. A space between the first supporting platform 73 and the second platform 74 is used as an operating platform 76 for a constructor to construct.

[0042] Referring to FIGS. 3-4, a T-shaped groove 81 is provided on the bottom of a truss 8, the T-shaped groove 81 extends along the length direction of the truss 8, a connecting pillar 731 is vertically provided on the upper end face of the first supporting platform 73; particularly a T-shaped block 732 slidably connected in the T-shaped groove 81 is provided on the top end of the connecting pillar 731. In particular, the T-shaped groove 81 is in communication with the end of the truss 8, which is conducive to sliding the T-shaped block 732 in the T-shaped groove 81. After connecting, the opening of an end of the T-shaped groove 81 is blocked.

[0043] In addition, a first through groove 733 is provided on the middle of the first supporting platform 73, and a second through groove 741 is provided on the middle of the second supporting platform 74. When the climbing formwork structure 7 is assembled on the starting segment of the lower tower pillar 2, the starting segment of the lower tower pillar 2 is passed through the second through groove 741 and the first through groove 733 respectively from down to up, and the climbing formwork 7 structure is located and guided by the first through groove 733 and the second through groove 741.

[0044] In addition, in order to improve the moving stability of the climbing formwork structure 7, the operator mounts the guide rail 21 on the out wall of the starting segment of the lower tower pillar 2 on the operating platform 76. Moreover, a guide block 742 is arranged on the inner side wall of the second through groove 741; particularly the guide block 742 is slidably connected to the guide rail 21, and the length direction of the guide rail 21 is consistent with the extending direction of the lower tower pillar 2.

[0045] The lower side of the four side formworks 71 are all provided with a slide block, and the upper surface of the first supporting platform 73 is provided with four sliding grooves; particularly the four slide grooves are arranged in a cross pattern and distributed along the periphery of the first through groove 733. The side form work 71 is slidably connected in a sliding groove of the upper surface of the first supporting platform 73 by the slide block. Such that the four side formworks 71 are arranged around the periphery of the first through groove 733. The four hydraulic cylinders 72 are corresponded to the four side formworks 71, thereby driving the corresponding side formwork 71 to move in a direction adjacent or away from the first through groove 733. In particular, one end of the hydraulic cylinder 72 is connected to the first supporting platform 73 with a hinge joint, the other end of the hydraulic cylinder 72 away from the first supporting platform 73 is provided with a dovetail block with hinge joint, and the back side of the side formwork 71 is provided with a dovetail groove 711; particularly the dovetail groove 711 extends along the vertical direction, and the dovetail block is slidably connected in the dovetail groove 711.

[0046] Before the lower tower pillar 2 is poured, the hydraulic cylinder 72 drives the side formwork 71 to move towards the first through groove 733 until the inner side of the side formwork 71 abuts on the out wall of the starting segment of the lower tower pillar 2, and the four side formworks 71 is provided with a pouring cavity 10 above the starting segment of the lower tower pillar 2. At this time, the tilt directions of the two climbing formwork structures 7 are respectively pointed at the outer side of the lower tower pillar 2, a new segment of the lower tower pillar 2 is formed by pouring in the pouring cavity 10, then the truss 8 is lifted by a tower crane 9, and the two climbing formwork structures 7 are driven by the truss 8 to move to a construction portion of next segment of the lower tower pillar 2. Then the pouring is processed, and the construction of a segment of the lower tower pillar 2 is completed. The above steps are repeated until the construction of the lower tower pillar 2 are completed.

[0047] step 3: pouring for a lower beam 3: after completing the construction of the two lower tower pillars 2, lifting the truss 8 until the two climbing formwork structures 7 are separated from the two lower tower pillars 2; building a construction platform between the two lower tower pillars 2; and completing pouring construction of the lower beam 3 on tops of the two lower tower pillars 2.

[0048] step 4: pouring and climbing formwork for two middle tower pillars 4: completing the construction of a starting segment of each of the two middle tower pillars 4 on a top of the lower beam 3; reassembling the two climbing formwork structures 7 and the truss 8; exchanging portions of the two climbing formwork structures 7 on two ends of the truss 8, such that the two climbing formwork structures 7 are inclined respectively towards an inner side of a corresponding one of the two middle tower pillars 4; mounting the two climbing formwork structures 7 at the two ends of the truss 8 on the starting segments of each of the two middle tower pillars 4; particularly, a pouring cavity 10 is provided on a top of each of the starting segments of each of the two middle tower pillars 4; forming a new segment of each of the two middle tower pillars 4 by pouring in the pouring cavities 10; lifting the truss 8 such that the truss 8 drives the two climbing formwork structures 7 to move to a construction portion of next segment of the two middle tower pillars 4 for pouring; repeating the above steps until a construction of the two middle tower pillars 4 is completed;

[0049] step 5: pouring for a upper beam: building a construction platform above the lower beam 3, and completing the pouring for the upper beam on the top of the two middle tower pillars 4.

[0050] Step 6: pouring and climbing formwork for two upper tower pillars: completing a construction of the two upper tower pillars 6 on the upper beam 5. In the present application, the formwork can be directly built, the pouring can be directly performed, and there is no requirement for the climbing formwork structure 7 due to a relatively low height of the upper tower pillar 6.

[0051] The above are the preferred embodiments of the present application, which are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application. 1 bridge pier 2 lower tower pillar guide rail lower beam middle tower pillar upper beam upper tower pillar climbing formwork structure side formwork dovetail groove hydraulic cylinder first supporting platform connecting pillar T-shaped block first through groove second supporting platform second through groove guide block connecting bar operating platform truss T-shaped groove tower crane pouring cavity

Claims

1. A method for constructing an ultra-high main tower of a cable stayed bridge, comprising:step 1: pouring for a starting segment of two lower tower pillars (2): building a formwork of a starting segment of two lower tower pillars (2) on a bridge pier (1), pouring in the formwork to form the starting segment of the two lower tower pillars (2), and after the starting segment of the lower tower pillar (2) is poured and formed, removing the formwork;step 2: pouring and climbing formwork for the two lower tower pillars (2): assembling a climbing formwork structure (7) around a periphery of the starting segment of each of the two lower tower pillars (2), wherein a pouring cavity (10) is formed by each of the two climbing formwork structures (7) on a top of the starting segment of each of the two lower tower pillars (2); arranging a truss (8) on top of each of the two climbing formwork structures (7), wherein the top of each of the two climbing formwork structures (7) are respectively slidably connected to a bottom of the truss (8), a sliding direction of the two climbing formwork structures (7) is consistent with a length direction of the truss (8), and the two climbing formwork structures (7) are inclined respectively towards an outer side of a corresponding one of the two lower tower pillars (2); forming a new segment for each of the two lower tower pillars (2) by pouring in each of the pouring cavities (10); lifting the truss (8), such that the truss (8) drives the two climbing formwork structures (7) to move to a construction portion of next segments of the two lower tower pillars (2) for pouring, and repeating the above steps until construction of the two lower tower pillars (2) is completed;step 3: pouring for a lower beam (3): after completing the construction of the two lower tower pillars (2), lifting the truss (8) until the two climbing formwork structures (7) are separated from the two lower tower pillars (2); building a construction platform between the two lower tower pillars (2); and completing pouring construction of the lower beam (3) on tops of the two lower tower pillars (2);step 4: pouring and climbing form work for two middle tower pillars (4): completing the construction of a starting segment of each of the two middle tower pillars (4) on a top of the lower beam (3); reassembling the two climbing formwork structures (7) and the truss (8); exchanging portions of the two climbing formwork structures (7) on two ends of the truss (8), such that the two climbing formwork structures (7) are inclined respectively towards an inner side of a corresponding one of the two middle tower pillars (4); mounting the two climbing formwork structures (7) at the two ends of the truss (8) on the starting segments of each of the two middle tower pillars (4), wherein a pouring cavity (10) is provided on a top of each of the starting segments of each of the two middle tower pillars (4); forming a new segment of each of the two middle tower pillars (4) by pouring in the pouring cavities (10); lifting the truss (8) such that the truss (8) drives the two climbing formwork structures (7) to move to a construction portion of next segment of the two middle tower pillars (4) for pouring; repeating the above steps until a construction of the two middle tower pillars (4) is completed;step 5: pouring for a upper beam (5): building a construction platform on the lower beam (3), and completing a pouring construction of the upper beam (5) on tops of the two middle tower pillars (4); andstep 6: pouring and climbing formwork for two upper tower pillars (6): completing a construction of the two upper tower pillars on the upper beam (5).

2. The method for constructing the ultra-high main tower of the cable stayed bridge according to claim 1, wherein each of the two climbing formwork structures (7) comprises a first supporting platform (73), four side formworks (71) and four driving components; a first through groove (733) is provided in middle of the first supporting platform (73), the four side formworks (71) are slidably connected to an upper surface of the first supporting platform (73) and are arranged around a periphery of the first through groove (733); the four driving components one by one corresponds to the four side formworks (71), wherein each of the four driving components is configured to drive a corresponding one of the four side formworks (71) to movetowards or away from the first through groove (733); and during pouring the two lower tower pillars (2), each of the starting segments of each of the two lower tower pillars (2) passes through the first through groove (733), each driving component drives the corresponding one of the four side formworks (71) to move towards the first through groove (733) until an inner side of each of the four side formworks (71) abuts against an outer wall of the starting segments of the lower tower pillars (2); and the pouring cavity (10) is formed by the four side formworks (71) on the starting segments of the two lower tower pillars (2).

3. The method for constructing the ultra-high main tower of the cable stayed bridge according to claim 2, wherein each of the two climbing formwork structures (7) further comprises a second supporting platform (74) located under the first supporting platform (73), a second through groove (741) is provided in middle of the second supporting platform (74), the first supporting platform (73) is connected to the second supporting platform (74) with a plurality of connecting bars (75), and an operating platform (76) is formed between the first supporting platform (73) and the second supporting platform (74).

4. The method for constructing the ultra-high main tower of the cable stayed bridge according to claim 3, wherein the step 2 of pouring and climbing formwork for the two lower tower pillars (2) comprises: fixing a guide rail (21) on an outer wall of the starting segment of each of the two lower tower pillars (2), wherein a length direction of the guide rail (21) is consistent with an extending direction of the lower tower pillar (2), a guide block (742) is provided on an inner side wall of the second through groove (741), the guide block (742) is slidably connected to the guide rail (21); and after the climbing formwork structure (7) rises a segment each time, the guide rail (21) is mounted on the outer wall of the segment of the poured lower tower pillar (2) on the construction platform of the climbing formwork structure (7), thereby completing the extending step of the guide rail (21).

5. The method for constructing the ultra-high main tower of the cable stayed bridge according to claim 2, wherein a T-shaped groove (81) extends along a length direction of thetruss (8) is provided on a bottom of the truss (8), a connecting pillar (731) is vertically provided on an upper end surface of the first supporting platform (73), a T-shaped block (732) slidably connected in the T-shaped groove (81) is provided with a top end of the connecting pillar (731).

6. The method for constructing the ultra-high main tower of the cable stayed bridge5 according to claim 5, wherein the T-shaped groove (81) is in communication with an end of the truss (8).

7. The method for constructing the ultra-high main tower of the cable stayed bridge according to claim 6, wherein before the truss (8) is lifted, an opening of an end of the T-shaped groove (81) is blocked.10 8. The method for constructing the ultra-high main tower of the cable stayed bridgeaccording to claim 3, wherein each driving component is a hydraulic cylinder (72), a first end of the hydraulic cylinder (72) is connected to the first supporting platform (73) with a hinge joint, a second end of the hydraulic cylinder (72) away from the first supporting platform (73) is connected to a dovetail block with a hinge joint, a dovetail groove (711) is provided on an outer15 side wall of the side formwork (71), the dovetail groove (711) vertically extends, and the dovetail block is slidably connected in the dovetail groove (711).

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