A method for horizontally rotating and erecting precast bridge girders without landing

Abstract

The present invention is a method for horizontally rotating and erecting precast bridge girders without landing. After the construction of precast piles and precast capping beams is completed, the next span of main girders is erected without landing on the already erected span of main girders, and so on to complete the work of erecting all girders, including the following steps: preparation before construction; transporting the precast box girders to be erected to the site, placing one end on the combined jacks, lifting the other end of the precast box girder by a crawler crane, rotating 180° around the combined jacks to above the next adjacent precast capping beam, installing rubber bearings, and making the precast box girder land on the rubber bearings; after one end of the precast box girder lands, lifting the other end of the precast box girder by a crawler crane, removing the combined jacks, installing rubber bearings, and making the precast box girder land on the rubber bearings; moving the combined jacks correspondingly on the precast capping beam to facilitate the hoisting of multiple precast box girders within one span of the main girders to be erected. The present invention protects the ground environment and is convenient for construction.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated bridge construction, and particularly to a method for horizontally rotating and erecting precast bridges without landing on the ground. Background Art

[0002] The prefabricated bridge construction technology refers to the bridge construction technology in which the bridge structure is prefabricated in the factory and assembled on site. This technology has high construction quality, short construction period and less impact on the site environment and traffic. For example, precast small box girders are one of the main forms of existing prefabricated bridges.

[0003] Existing precast small box girders can be installed on site using crawler cranes and ordinary bridge erecting machines. Using a crawler crane for hoisting requires the crawler crane to have a large lifting capacity, and even the method of double-crane lifting is used. This method requires the ground to be treated to have sufficient bearing capacity, but it will cause great damage to the environment. Although using an ordinary bridge erecting machine for installation can achieve non-landing construction, it requires a high construction cost. Summary of the Invention

[0004] The present invention aims to solve the deficiencies of the existing technology and provides a method for horizontally rotating and erecting precast bridges without landing on the ground.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A method for horizontally rotating and erecting precast bridges without landing on the ground. After the construction of precast piles and precast capping beams is completed, the next span of main beam is erected without landing on the already erected span of main beam, and so on to complete all the beam erection work, including the following steps:

[0006] Step 1: Preparation before construction;

[0007] A span of main beam is composed of several precast small box girders arranged side by side. A number of pairs of rubber bearings are placed side by side on the top of the precast capping beam. The end of the already erected precast small box girder is supported by a pair of rubber bearings. A rotatable combined jack is placed on one of the precast capping beams at one end of the already erected precast small box girder. A crawler crane is placed on the already erected span of main beam;

[0008] Step 2: Transport the small box girder to be erected to the site, place one end on the combined jack, lift the other end of the precast small box girder by the crawler crane, and rotate 180° around the combined jack to above the next adjacent precast capping beam, install the rubber bearing, and make the precast small box girder fall onto the rubber bearing;

[0009] Step 3: After one end of the precast small box girder is in place, lift the other end of the precast small box girder by the crawler crane, remove the combined jack, install the rubber bearing, and make the precast small box girder fall onto the rubber bearing;

[0010] Step 4: Move the combined jack correspondingly on the precast capping beam to facilitate the hoisting of multiple precast small box girders within one span of the main girder to be erected.

[0011] Step 5: After one span of the main girder is erected, the crawler crane is moved to the just-erected span of the main girder, and Steps 2 - 4 are repeated to continue the erection of the next span of the main girder, and so on to complete all the beam erection work.

[0012] Particularly, there are five precast piles at the bottom of each precast capping beam. The precast piles are circular pipe piles with a diameter of 0.9 m. The width of the precast capping beam is 3 m, the height is 2 m, and the length is 18 m. Both the precast piles and the precast capping beam are made of reinforced concrete structures.

[0013] Particularly, one span of the main girder consists of 4 precast small box girders.

[0014] Particularly, the length of the precast small box girder is 20 m and the height is 1.5 m. A pair of lifting lugs are provided at both ends of the top of the precast small box girder.

[0015] Particularly, the rubber bearing is rectangular with a height of 0.3 m.

[0016] Particularly, the height of the combined jack is 2.1 m. After the combined jack is placed, its center coincides with the center position of a pair of rubber bearings.

[0017] Particularly, the combined jack includes a temporary rubber bearing, a jack, a turntable, and a turntable base. The turntable is movably installed on the turntable base. The jack is installed on the top of the turntable, and the temporary rubber bearing is installed on the top of the jack.

[0018] Particularly, the vertical section of the turntable is in an inverted concave shape, and the vertical section of the turntable base is in a convex shape. A polytetrafluoroethylene plate is provided between the contact surfaces of the turntable and the turntable base to increase the sliding ability of the turntable.

[0019] Particularly, the turntable and the turntable base are connected by balls and pot - type hinge bearings to increase the sliding ability.

[0020] Particularly, a motor is installed on the turntable base. The turntable and the motor are driven by gear transmission to drive the turntable to rotate.

[0021] The beneficial effects of the present invention are:

[0022] 1. By using the horizontal rotation method to hoist only one end of the precast small box girder, while reducing the lifting weight, the mechanical cost is also reduced.

[0023] 2. Compared with the crawler crane hoisting on the ground, when the crawler crane works on the bridge deck, there is no need to treat the ground and the environment is not damaged.

[0024] 3. Compared with ordinary bridge erecting machines, this method has low construction cost, good flexibility, high stability and convenient construction. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the hoisting and horizontal rotation construction of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the combined jack of the present invention;

[0027] Figure 3 It is a schematic diagram of the layout of the front beam span before hoisting of the present invention;

[0028] Figure 4 It is a schematic diagram of the transportation and positioning of precast small box girders of the present invention;

[0029] Figure 5 It is a schematic diagram of the horizontal rotation and hoisting construction process of precast small box girders of the present invention;

[0030] Figure 6 It is a schematic diagram of the rotation and positioning of precast small box girders of the present invention;

[0031] Figure 7 It is a schematic diagram of the complete positioning of precast small box girders of the present invention;

[0032] In the figure: 1 - precast pile; 2 - precast capping beam; 3 - one-span main beam; 31 - precast small box girder; 32 - lifting lug; 4 - combined jack; 41 - temporary rubber bearing; 42 - jack; 43 - turntable; 44 - turntable base; 45 - polytetrafluoroethylene plate; 5 - rubber bearing; 6 - crawler crane;

[0033] The following will be described in detail with reference to the embodiments of the present invention with reference to the drawings. Specific Embodiments

[0034] The present invention will be further described below in conjunction with the embodiments:

[0035] As Figures 1-7 shown, a method for horizontally rotating and erecting precast bridges without landing. After the construction of precast piles 1 and precast capping beams 2 is completed, the next-span main beam 3 is erected without landing on the already erected one-span main beam 3, and so on to complete all the work of beam erection, including the following steps:

[0036] Step 1: Preparation before construction;

[0037] One-span main beam 3 is composed of a number of precast small box girders 31 arranged side by side. A number of pairs of rubber bearings 5 are placed side by side on the top of the precast capping beam 2. The end of the already erected precast small box girder 31 is supported by a pair of rubber bearings 5. A rotatable combined jack 4 is placed on one of the precast capping beams 2 at one end of the already erected precast small box girder 31. A crawler crane 6 is placed on the already erected one-span main beam 3;

[0038] There are five precast piles 1 at the bottom of each precast capping beam 2. The precast piles 1 are circular pipe piles with a diameter of 0.9 m. The width of the precast capping beam 2 is 3 m, the height is 2 m, and the length is 18 m. Both the precast piles 1 and the precast capping beam 2 are made of reinforced concrete structure;

[0039] One span of the main beam 3 is composed of 4 precast small box girders 31. The length of the precast small box girder 31 is 20 m and the height is 1.5 m. A pair of lifting lugs 32 are provided at both ends of the top of the precast small box girder 31 for convenient hoisting; the rubber bearing 5 is rectangular with a height of 0.3 m; the combined jack 4 has a height of 2.1 m. After the combined jack 4 is placed, its center coincides with the center positions of a pair of rubber bearings 5;

[0040] The combined jack 4 includes a temporary rubber bearing 41, a jack 42, a turntable 43, and a turntable base 44. The turntable 43 is movably installed on the turntable base 44. The jack 42 is installed on the top of the turntable 43, and the temporary rubber bearing 41 is installed on the top of the jack 42.

[0041] The vertical section of the turntable 43 is in an inverted concave shape, and the vertical section of the turntable base 44 is in a convex shape. A polytetrafluoroethylene plate 45 is provided between the contact surfaces of the turntable 43 and the turntable base 44 to increase the sliding ability of the turntable 43.

[0042] The turntable 43 and the turntable base 44 are connected by balls and pot-shaped hinge bearings to increase the sliding ability.

[0043] A motor is installed on the turntable base 44. The turntable 43 and the motor are driven by gears to drive the turntable to rotate.

[0044] Among them, the rotation mode of the combined jack 4 can be driven by a motor. Between the turntable 43 and the turntable base 44, either the polytetrafluoroethylene plate 45 can be used, or balls and pot-shaped hinge bearings can be used to increase the sliding ability. The specific selection can be determined by the construction personnel according to the actual working conditions on site.

[0045] The present invention is applicable to the installation of one-span main beam 3 using precast small box girders 31, and is also applicable to the installation of one-span main beam 3 using T-shaped beams and slab beams.

[0046] The specific construction process is as described in Steps 2 - 5 below;

[0047] Step 2: Transport the small box girder 31 to be erected to the site, place one end on the combined jack 4, and lift the other end of the precast small box girder 31 by the crawler crane 6. Rotate 180° around the combined jack 4 to the upper part of the next adjacent precast capping beam 2, install the rubber bearing 5, and make the precast small box girder 31 land on the rubber bearing 5;

[0048] Step 3: After one end of the precast small box girder 31 is positioned, the crawler crane 6 hoists the other end of the precast small box girder 31, removes the combined jack 4, installs the rubber bearing 5, and positions the precast small box girder 31 onto the rubber bearing 5;

[0049] Step 4: Move the combined jack 4 correspondingly on the precast cap beam 2 to facilitate the hoisting of multiple precast small box girders 31 within one span of the main girder 3 to be erected;

[0050] Step 5: After one span of the main girder 3 is erected, the crawler crane 6 moves to the just-erected span of the main girder 3, and repeats Steps 2 - 4 to continue the erection of the next span of the main girder 3, and so on to complete all the beam erection work.

[0051] The present invention provides a method for horizontally rotating and erecting precast bridges without landing. The vertical force for hoisting the beam is small. By reducing the hoisting weight and using the crawler crane for hoisting on the bridge, non-landing construction is achieved, which is environmentally friendly, has low construction cost, good flexibility, and high stability, bringing great convenience to the construction of precast bridges.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The above has given an exemplary description of the present invention. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or it is directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for erecting precast bridge girders without landing, characterized in that, after the construction of precast piles (1) and precast capping beams (2) is completed, the next span of main girders (3) is erected without landing on the already erected span of main girders (3), and so on to complete all the work of girder erection, including the following steps: Step 1: Preparation before construction; A span of main girders (3) consists of several precast small box girders (31) arranged side by side. A number of pairs of rubber bearings (5) are placed side by side on the top of the precast capping beam (2). The end of the already erected precast small box girder (31) is supported by a pair of rubber bearings (5). A rotatable combined jack (4) is placed on one end of the precast capping beam (2) of the already erected precast small box girder (31). A crawler crane (6) is placed on the already erected span of main girders (3); Step 2: Transport the small box girder (31) to be erected to the site, place one end on the combined jack (4), lift the other end of the precast small box girder (31) by the crawler crane (6), rotate 180° around the combined jack (4) to above the next adjacent precast capping beam (2), install the rubber bearing (5), and make the precast small box girder (31) land on the rubber bearing (5); Step 3: After one end of the precast small box girder (31) lands, lift the other end of the precast small box girder (31) by the crawler crane (6), remove the combined jack (4), install the rubber bearing (5), and make the precast small box girder (31) land on the rubber bearing (5); Step 4: Move the combined jack (4) correspondingly on the precast capping beam (2) to facilitate the hoisting of multiple precast small box girders (31) within the span of main girders (3) to be erected; Step 5: After the erection of a span of main girders (3) is completed, move the crawler crane (6) to the just erected span of main girders (3), repeat Steps 2 - 4, and continue the erection of the next span of main girders (3), and so on to complete all the work of girder erection.

2. The method for erecting precast bridge girders without landing according to claim 1, characterized in that, there are five precast piles (1) at the bottom of each precast capping beam (2). The precast piles (1) are circular pipe piles with a diameter of 0.9 m. The width of the precast capping beam (2) is 3 m, the height is 2 m, and the length is 18 m. Both the precast piles (1) and the precast capping beams (2) are of reinforced concrete structure.

3. The method for erecting precast bridge girders without landing according to claim 1, characterized in that, a span of main girders (3) consists of 4 precast small box girders (31).

4. The method for erecting precast bridge girders without landing according to claim 1, characterized in that, the length of the precast small box girder (31) is 20 m and the height is 1.5 m. A pair of lifting lugs (32) are provided at both ends of the top of the precast small box girder (31).

5. The method for erecting precast bridge girders without landing according to claim 1, characterized in that, the rubber bearing (5) is rectangular with a height of 0.3 m.

6. The method for erecting precast bridge girders without landing according to claim 1, characterized in that, the height of the combined jack (4) is 2.1 m. After the combined jack (4) is placed, its center coincides with the center position of a pair of rubber bearings (5).

7. A method for prefabricated bridge non-ground horizontal rotation girder erection according to claim 6, characterized in that, The combined jack (4) includes a temporary rubber bearing (41), a jack (42), a turntable (43), and a turntable base (44). The turntable (43) is movably installed on the turntable base (44), the jack (42) is installed on the top of the turntable (43), and the temporary rubber bearing (41) is installed on the top of the jack (42).

8. A method for prefabricated bridge non-ground horizontal rotation girder erection according to claim 7, characterized in that, The vertical section of the turntable (43) is in an inverted concave shape, the vertical section of the turntable base (44) is in a convex shape, and a polytetrafluoroethylene plate (45) is provided between the contact surfaces of the turntable (43) and the turntable base (44) to increase the sliding ability of the turntable (43).

9. A method for prefabricated bridge non-ground horizontal rotation girder erection according to claim 7, characterized in that, The turntable (43) and the turntable base (44) are connected by balls and pot-type hinge supports to increase the sliding ability.

10. A method for prefabricated bridge non-ground horizontal rotation girder erection according to claim 7, characterized in that, A motor is installed on the turntable base (44), and the turntable (43) and the motor are driven by gear transmission to drive the turntable to rotate.

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