An anti-overturning installation structure and method for precast box girders with cantilever cap beams.

Abstract

This application discloses an anti-overturning installation structure and method for precast box girders with cantilever caps. The anti-overturning installation structure includes: a box girder to be erected, with both ends used for mounting on support pads at the erection positions of two cantilever cap girders; an annular lifting strap, fitted onto the overhanging portion of the cantilever cap girder and distributed on the side of the box girder to be erected with the short flange plate; and a first manual hoist, with one end hooked to the wet joint reinforcement of the box girder to be erected on the short flange plate side, and the other end hooked to hook the annular lifting strap and tighten it. This anti-overturning installation structure and method utilizes the annular lifting strap and the cantilever cap girder to counteract the overturning moment generated by the unbalanced sides of the short and long flange plates, making it suitable for the construction of precast box girders where support points cannot be set, thus having a wider range of applications.

Description

Technical Field

[0001] This application relates to the technical field of methods or equipment specifically used for erecting or assembling bridges, and specifically to an anti-overturning installation structure and method for a precast box girder of a cantilever cap beam. Background Technology

[0002] Segmental assembly box girder is an emerging bridge construction method in recent years. Compared with traditional cast-in-place and precast erection methods, it has the advantages of high technical content, fast construction speed, small creep and camber of the girder after completion, and small prestress loss. It is particularly suitable for the construction of urban viaducts and represents the development direction of urban bridge design and construction.

[0003] When installing precast box girders, they need to be placed on the support pads of the cantilever cap beam beforehand. However, due to the asymmetry of the flanges on both sides of the precast box girder, there is a risk of overturning before the precast box girder on the cantilever cap beam is connected as a whole. To solve this problem, the existing anti-overturning structure involves setting a telescopic strut under the flange of one side of the precast box girder to support the flange on the cap beam. This anti-overturning structure requires a support point on the cap beam. When there is no cap beam as a support point under the flange of the precast box girder on the side prone to overturning, the anti-overturning structure cannot be set up, limiting its application.

[0004] Therefore, there is an urgent need for a more widely applicable anti-overturning installation structure for precast box girders. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an anti-overturning installation structure for precast box girders that can solve the problem of overturning when placed on cantilever cap beams. The technical solution adopted includes:

[0006] An anti-overturning installation structure for a precast box girder with a cantilever cap beam, wherein the precast box girder has long flange plates and short flange plates on both sides, and the anti-overturning installation structure includes:

[0007] The box girder to be erected has its two ends used to be supported on the bearing pads at the two cantilever cap beams to be erected.

[0008] The ring-shaped lifting straps are fitted onto the cantilevered portion of the cantilever cap beam and are distributed on the side of the box girder to be erected with short flanges.

[0009] The first manual hoist has a hook at one end that is attached to the wet joint reinforcement of the box girder on the short flange side, and a hook at the other end that is used to hook the annular sling and tighten it.

[0010] Preferably, the material of the annular suspender is polyester.

[0011] Preferably, a jack is also included, placed on the upper end of the cantilever cap beam and located on the side of the box girder to be erected with a long flange plate, the jack being used to support the bottom plate of the box girder to be erected.

[0012] Preferably, the jacks are provided on one side of the two support pads at both ends of the box girder to be erected.

[0013] Preferably, a second manual hoist is also included. One end of the box girder to be erected is provided with an already erected box girder. The first manual hoist is installed at the end of the box girder to be erected away from the already erected box girder. The hook at one end of the second manual hoist is hung on the wet joint reinforcement of the box girder to be erected on the short flange side, and the hook at the other end is hung on the wet joint reinforcement of the already erected box girder.

[0014] This application also discloses a method for anti-overturning installation of precast box girders with cantilever cap beams, including:

[0015] Step 1: After the bridge erecting machine is erected, the ring sling is placed on the cantilevered part of the cantilever cap beam, so that the ring sling is distributed on one side of the support pad stone at the position to be erected, and is located on the side of the box girder to be erected that has the short flange plate.

[0016] Step 2: After feeding the beam, the overhead crane moves the box girder to be erected to the support pads at both ends of the girder. The hook of one end of the first manual hoist is attached to the wet joint reinforcement of the box girder on the short flange side. The hook of the other end of the first manual hoist is attached to the ring sling. The ring sling and the cantilever cap beam are tightened at both ends of the first manual hoist.

[0017] In a preferred embodiment, after completing step 1, jacks are installed on the cantilever cap beam, and the jacks are distributed on the side of the long flange plate of the box girder to be erected, corresponding to the support pad stone at the position to be erected, so that the jacks are raised to be level with the height of the support pad stone. After feeding the beam in step 2, the overhead crane erects the box girder to be erected on the support pad stone and jacks at the position to be erected.

[0018] In a preferred embodiment, in step 1, the hook of one end of the first manual hoist is hung on the end of the box girder to be erected that is away from the already erected box girder. After completing step 2, the hook of one end of the second manual hoist is hung on the wet joint reinforcement of the box girder to be erected on the short flange side, and located at the end of the box girder to be erected that is close to the already erected box girder. Then the hook of the other end of the second manual hoist is hung on the wet joint reinforcement of the already erected box girder.

[0019] The beneficial effects of this invention are:

[0020] The first manual hoist is used to connect the wet joint reinforcement and the ring sling on the short flange side of the box girder to be erected. Tightening the first manual hoist causes the hooks at both ends to pull the wet joint reinforcement and the ring sling tight. In this way, the ring sling and the cantilever cap beam are used to counteract the overturning moment generated by the unbalanced side of the short flange and the long flange. This method is suitable for the construction of precast box girders where it is not possible to set up supports, and has a wider range of applications. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a top view of the anti-overturning installation structure of the precast box girder of the cantilever cap beam described in the embodiments of this application;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a front view of the anti-overturning installation structure of the precast box girder of the cantilever cap beam described in the embodiments of this application;

[0025] Figure 4 This is a side view of the anti-overturning installation structure of the precast box girder of the cantilever cap beam described in the embodiments of this application;

[0026] Figure 5 for Figure 4 A partially enlarged view of the anti-overturning installation structure of the precast box girder. Detailed Implementation

[0027] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0028] In the description of this invention, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0031] Example 1

[0032] Reference Figure 1-5 This application presents an embodiment of an anti-overturning installation structure for a precast box girder with a cantilever cap beam, as shown in the attached figure. Figure 1 As shown, the precast box girder 50 has long flange plates 51 and short flange plates 52 on both sides. The anti-overturning installation structure described in this embodiment includes:

[0033] The box girder 10 to be erected has its two ends used to be erected on the support pads 21 at the positions to be erected of the two cantilever cap beams 20 respectively.

[0034] The ring-shaped lifting strap 30 is fitted onto the cantilevered portion of the cantilever cap beam 20 and is distributed on the side of the box beam 10 to be erected with the short flange plate 52.

[0035] The first manual hoist 40 has a hook at one end that is attached to the wet joint reinforcement of the box girder 10 to be erected on the side of the short flange plate 52, and a hook at the other end that is used to hook the annular sling 30 and tighten it.

[0036] After the bridge erecting machine is set up, the annular sling 30 is first fitted onto the cantilever cap beam 20. After feeding the beam, the overhead crane of the bridge erecting machine moves the box girder 10 to be erected to its two ends, which are respectively placed on the support pads 21 at the erection positions. Then, the first manual hoist 40 is used to connect the wet joint reinforcement of the box girder 10 on the short flange plate 52 side and the annular sling 30. The first manual hoist 40 is tightened so that the hooks at both ends pull the wet joint reinforcement and the annular sling 30. In this way, the annular sling 30 and the cantilever cap beam 20 are used to counteract the overturning moment generated by the unbalanced side of the short flange plate 52 and the long flange plate 51. This method is suitable for the construction of precast box girders 50 where it is impossible to set up supports, and has a wider range of applications.

[0037] In this embodiment, the first hand chain hoist is a 5T hand chain hoist, and the load-bearing capacity of the annular sling 30 is 5T.

[0038] Preferably, the annular sling 30 is made of polyester. The polyester annular sling 30 will generate sufficient friction between the cap beams to prevent the precast box girder 50 from slipping.

[0039] Furthermore, a jack 60 can be installed on one side of the support pad 21 at the location to be erected. The jack 60 is placed on the upper end of the cantilever cap beam 20 and on the side of the box girder 10 to be erected with the long flange plate 51. The jack 60 is used to support the bottom plate of the box girder 10 to be erected, thereby increasing the support area of ​​the cap beam on the side of the bottom plate with the long flange plate 51 and reducing the possibility of the long flange plate 51 overturning.

[0040] Furthermore, based on the above, the jacks 60 are provided on one side of the two support pads 21 at both ends of the box girder 10 to be erected, so that the cap beam can be stably supported on the bottom plate on the side of the box girder 10 with the long flange plate 51.

[0041] For the first box girder 10 to be erected in the bridge section, annular lifting straps 30 can be fitted on the cantilever cap beams 20 at both ends of the box girder 10. After the box girder 10 is moved and placed on the two support pads 21 at the erection position, the first manual hoist 40 is hung on the wet joint reinforcement on the side of the short flange plate 52 at both ends of the box girder 10, and connected to the annular lifting straps 30 on the two cantilever cap beams 20 at both ends of the box girder 10 through the first manual hoist 40.

[0042] For a position where a box girder 80 has already been erected at one end, placing the already erected box girder 80 on the cantilever cap beam 20 will affect the installation of the annular sling 30.

[0043] Therefore, for the position to be erected where one end of the box girder 80 has already been erected, after placing the box girder 10 to be erected at the position, hang a first manual hoist 40 at the end of the box girder 10 to be erected away from the already erected box girder 80, and hang a second manual hoist 70 at the end of the box girder 10 to be erected close to the already erected box girder 80. The second manual hoist 70 is distributed on the wet joint reinforcement of the box girder 10 to be erected on the side of the short flange plate 52. Then, hang the hook at the other end of the second hoist on the wet joint reinforcement of the already erected box girder 80.

[0044] A second manual hoist 70 connects the already erected box girder and the box girder 10 to be erected to generate a counter-pull on the erected box girder, further preventing the box girder 10 to be erected from overturning. As shown in the attached drawing, the hooks at both ends of the second manual hoist 70 are attached to the sides of the already erected box girder and the box girder 10 to be erected that are close to each other.

[0045] Example 2

[0046] Embodiment 2 of this application proposes a method for anti-overturning installation of precast box girders with cantilever cap beams, including:

[0047] Step 1: After the bridge erecting machine is erected, the ring sling 30 is fitted onto the cantilever cap beam 20 so that the ring sling 30 is distributed on one side of the support pad stone 21 at the position to be erected, and is located on the side of the box girder 10 to be erected corresponding to the short flange plate 52.

[0048] Step 2: After feeding the beam, the overhead crane moves the box girder 10 to be erected to the support pads 21 at both ends of the box girder 10 to be erected. The hook at one end of the first manual hoist 40 is hung on the wet joint reinforcement of the box girder 10 on the side of the short flange plate 52. The hook at the other end of the first manual hoist 40 is then hung on the annular sling 30. The two ends of the first manual hoist 40 are tightened to pull the annular sling 30 and the cantilever cap beam 20 together.

[0049] To improve the stability of the box girder 10 to be erected, after completing step 1, jacks 60 are installed on the cantilever cap beam 20, and the jacks 60 are distributed on the side of the long flange plate 51 of the box girder 10 to be erected corresponding to the support pad 21, so that the jacks 60 are raised to be level with the support pad 21. After feeding the beam in step 2, the overhead crane erects the box girder 10 to be erected on the support pad 21 and jacks 60 at the erection position.

[0050] Jacks 60 can be installed on the support pads 21 of the cap beams at both ends of the box girder 10 to improve the support stability of the cap beams on the bottom plate of the box girder 10 to be erected.

[0051] For the first box girder 10 to be erected in the bridge section to be erected, annular lifting straps 30 can be fitted on the cantilever cap beams 20 at both ends of the box girder 10 to be erected. After the box girder 10 to be erected is moved and placed on the two support pads 21 at the erection position, the first manual hoist 40 is hung on the wet joint reinforcement on the side of the short flange plate 52 at both ends of the box girder 10 to be erected, and the first manual hoist 40 is connected to the annular lifting straps 30 on the two cantilever cap beams 20 at both ends of the box girder 10 to be erected.

[0052] When a box girder has already been erected on one of the cap beams at the location to be erected, in step 1, the hook at one end of the first manual hoist 40 should be hung on the end of the box girder 10 to be erected away from the already erected box girder. Step 2 also includes hanging the hook at one end of the second manual hoist 70 on the wet joint reinforcement of the box girder 10 on the side of the short flange plate 52, and located at the end of the box girder 10 to be erected close to the already erected box girder. Then, the hook at the other end of the second manual hoist 70 is hung on the wet joint reinforcement of the already erected box girder to further increase the counter-tension of the box girder 10 to be erected.

[0053] In this embodiment, when the hooks of the first manual hoist 40 and the second manual hoist 70 are hung on the wet joint steel bars, several wet joint steel bars can be bent close to each other before the hooks are hung on the adjacent several wet joint steel bars.

[0054] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. An overturning-resistant mounting structure of a precast box girder of a cantilever cap beam, the precast box girder (50) having long flange plates (51) and short flange plates (52) on both sides thereof, characterized in that, The anti-overturning mounting structure comprises: A box girder (10) to be erected, the two ends of which are used to be erected on the support cushion stones (21) at the to-be-erected positions of two cantilever cap beams (20) respectively; A ring-shaped lifting belt (30) is sleeved on the overhanging part of the cantilever cap beam (20) and is distributed on the side of the to-be-erected box girder (10) having a short flange plate (52); A first manual hoist (40) is provided, one end of the hook of which is hung on the wet joint reinforcement on the side of the to-be-erected box girder (10) having the short flange plate (52), and the other end of the hook of which is used to hook the ring-shaped lifting belt (30) and tighten it. Further comprising a second manual hoist (70), one end of the hook of which is hung on the wet joint reinforcement on the side of the to-be-erected box girder (10) having the short flange plate (52), and the other end of the hook of which is hung on the wet joint reinforcement of the erected box girder (80).

2. The anti-overturning installation structure of the precast box girder of the cantilever cap beam according to claim 1, characterized in that, The material of the ring-shaped lifting belt (30) is polyester.

3. The anti-overturning installation structure of the precast box girder of the cantilever cap beam according to claim 1, characterized in that, Further comprising a jack (60) placed on the upper end of the cantilever cap beam (20) and located on the side of the to-be-erected box girder (10) having a long flange plate (51), the jack (60) being used to support the bottom plate of the to-be-erected box girder (10).

4. The anti-overturning installation structure of the precast box girder of the cantilever cap beam according to claim 3, characterized in that, The to-be-erected box girder (10) is provided with the jack (60) on one side of the two support cushion stones (21) at the two ends.

5. A method for installing a precast box girder against overturning of a cantilever cap beam, characterized in that, Comprise: Step 1, after the bridge erecting machine is erected, the ring-shaped lifting belt (30) is sleeved on the overhanging part of the cantilever cap beam (20), the ring-shaped lifting belt (30) is distributed on the side of the support cushion stone (21) at the to-be-erected position, and is located on the side of the to-be-erected box girder (10) corresponding to the short flange plate (52); one end of the hook of the first manual hoist (40) is hung on the end of the to-be-erected box girder (10) away from the erected box girder (80); Step 2, after feeding the beam, the crown block moves the to-be-erected box girder (10) to be erected on the support cushion stones (21) at the to-be-erected positions at the two ends respectively, one end of the hook of the first manual hoist (40) is hung on the wet joint reinforcement on the side of the to-be-erected box girder (10) having the short flange plate (52), the other end of the hook of the first manual hoist (40) is hung on the ring-shaped lifting belt (30), the ring-shaped lifting belt (30) and the cantilever cap beam (20) are tightened by tightening the two ends of the first manual hoist (40); one end of the hook of the second manual hoist (70) is hung on the wet joint reinforcement on the side of the to-be-erected box girder (10) having the short flange plate (52) and is located on the end of the to-be-erected box girder (10) close to the erected box girder (80), and the other end of the hook of the second manual hoist (70) is hung on the wet joint reinforcement of the erected box girder (80).

6. The method of claim 5, wherein the method further comprises: After step 1 is completed, the jack (60) is installed on the cantilever cap beam (20), and the jack (60) is distributed on the side of the support cushion stone (21) corresponding to the long flange plate (51) of the to-be-erected box girder (10), so that the jack (60) is lifted to be flush with the height of the support cushion stone (21), and after feeding the beam in step 2, the overhead crane erects the to-be-erected box girder (10) on the support cushion stone (21) and the jack (60) at the to-be-erected position.

7. The method of claim 5, wherein the method further comprises: After the to-be-erected box girder (10) is erected, the first manual hoist (40) is hung on the adjacent wet joint steel bars on the side of the short flange plate (52).

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