Construction method for pushing high falling beam on bridge floor

Abstract

The invention discloses a bridge floor pushing high beam falling construction method which comprises a first-stage beam falling process and a second-stage beam falling process. The first-stage beam falling process comprises the steps that a first height-adjustable temporary support and a second height-adjustable temporary support which are used for supporting a guide beam are arranged on a concrete beam; the height of the first height-adjustable temporary support and the height of the second height-adjustable temporary support are alternately adjusted and lowered, and then the height of the guide beam is gradually lowered till the guide beam is close to the concrete beam; the second-stage beam falling process comprises the steps that a third height-adjustable temporary support used for supporting the steel box beam is arranged on the bent cap, and a fourth height-adjustable temporary support used for supporting the steel box beam is arranged on the support; and the guide beam is cut off, then the height of the third height-adjustable temporary support and the height of the fourth height-adjustable temporary support are alternately adjusted and reduced, and then the height of the steel box beam is gradually reduced till the steel box beam falls onto the support. According to the method, the beam falling stability can be improved, and the danger coefficient can be remarkably reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering structure construction technology, and specifically relates to a bridge deck top pushing up and dropping beam construction method. Background Art

[0002] In the field of highway municipal transportation construction, with the acceleration of urbanization and the growing demand for transportation, the technology of cross-combination construction of steel box girders and concrete beams has been widely used due to its unique structural advantages and high construction efficiency. In particular, the cross-line jacking technology of steel box girders has become the mainstream method in cross-line construction because it can reduce interference with existing traffic and shorten the construction period. However, in this process, how to safely and efficiently complete the precise docking and beam dropping operations of steel box girders and concrete beams has become a technical problem that needs to be solved urgently.

[0003] The traditional beam dropping method is usually to connect the steel box girder to the structure below by dropping it once and for all after the bridge deck is assembled. This method is extremely dangerous when facing a beam drop height of 4m or even higher. The high beam drop height places extremely high demands on the stability of the beam drop system. The slightest carelessness may lead to structural instability or even safety accidents. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a construction method for pushing up and dropping beams on the top of a bridge deck, which can not only improve the stability of the dropped beams, but also significantly reduce the risk factor.

[0005] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0006] A bridge deck top-lifting beam-dropping construction method includes a first-stage beam-dropping process and a second-stage beam-dropping process;

[0007] The first stage of beam dropping process includes:

[0008] A first height-adjustable temporary support and a second height-adjustable temporary support for supporting the guide beam are provided on the concrete beam;

[0009] Alternately adjusting and lowering the heights of the first height-adjustable temporary support and the second height-adjustable temporary support, thereby gradually lowering the height of the guide beam until the guide beam approaches the concrete beam;

[0010] The second stage beam dropping process includes:

[0011] A third height-adjustable temporary support for supporting the steel box girder is provided on the cap beam, and a fourth height-adjustable temporary support for supporting the steel box girder is provided on the support;

[0012] The guide beam is cut off, and then the heights of the third height-adjustable temporary support and the fourth height-adjustable temporary support are alternately adjusted and lowered, thereby gradually lowering the height of the steel box beam until the steel box beam falls onto the support.

[0013] Furthermore, the first height-adjustable temporary support is composed of a jacking device and a column, a cushion beam, a plurality of cushion blocks and / or a plurality of cushion plates stacked together, and the second height-adjustable temporary support is composed of a column, a cushion beam, a plurality of cushion blocks and / or a plurality of cushion plates stacked together.

[0014] Furthermore, the alternating adjustment to reduce the height of the first height-adjustable temporary support and the second height-adjustable temporary support is specifically:

[0015] By utilizing the lifting and retracting cylinders of the lifting device in the first height-adjustable temporary support, the heights of the first height-adjustable temporary support and the second height-adjustable temporary support are alternately lowered, and at the same time, the composition of the first height-adjustable temporary support and the second height-adjustable temporary support are changed until the guide beam approaches the concrete beam.

[0016] Furthermore, the third height-adjustable temporary support is composed of a jacking device and columns, a cushion beam, a plurality of cushion blocks and / or a plurality of cushion plates stacked together, and the fourth height-adjustable temporary support is composed of columns, a cushion beam, a plurality of cushion blocks and / or a plurality of cushion plates stacked together.

[0017] Further, the alternating adjustment reduces the height of the third height-adjustable temporary support and the fourth height-adjustable temporary support, specifically:

[0018] Utilize the lifting and retracting cylinder of the lifting device in the third height-adjustable temporary support to alternately lower the heights of the third height-adjustable temporary support and the fourth height-adjustable temporary support, and at the same time coordinately change the composition of the third height-adjustable temporary support and the fourth height-adjustable temporary support until the steel box girder falls onto the support.

[0019] Furthermore, frictional contact is adopted between the top of the first height-adjustable temporary support and the top of the second height-adjustable temporary support and the guide beam.

[0020] Furthermore, the third height-adjustable temporary support and the fourth height-adjustable temporary support are in frictional contact with the steel box girder.

[0021] Furthermore, the lifting device adopts a jack.

[0022] Furthermore, the height of the column is 0.5m or 1m.

[0023] Furthermore, when the column is located at the bottom, the column and the corresponding contact surface are fixed by bolt connection.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] The present invention provides a bridge deck top push-up beam drop construction method, the beam drop method includes a first-stage beam drop process and a second-stage beam drop process, that is, a two-stage beam drop method, the first-stage beam drop process is now performed on the concrete beam, when the guide beam (the guide beam is connected to the steel box beam) is lowered by the first-stage beam drop process, the second-stage beam drop process is performed on the cap beam until the steel box beam is installed on the support. The present invention cleverly overcomes the problems of low stability coefficient and low safety when the traditional beam is dropped on the cap beam at one time through the two-stage beam drop method, greatly reduces the construction risk factor, the construction operation platform is large, and the construction operation is relatively convenient, which can not only improve the stability of the beam drop, but also significantly reduce the risk factor.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a cross-sectional schematic diagram of the beam dropping process in the first stage of an embodiment of the present invention;

[0029] Figures 2 to 21 It is a side schematic diagram of each process in the first stage of beam dropping process of an embodiment of the present invention;

[0030] Fig. 22 and Fig.23 It is a side schematic diagram of the beam dropping process in the second stage of the embodiment of the present invention;

[0031] Figures 24 to 37 It is a cross-sectional schematic diagram of each process in the second stage beam dropping process of an embodiment of the present invention.

[0032] In the figure: 1-concrete beam; 2-first height-adjustable temporary support; 3-second height-adjustable temporary support; 4-guide beam; 5-cap beam; 6-third height-adjustable temporary support; 7-support; 8-fourth height-adjustable temporary support; 9-steel box beam; a-column; b-pad beam; c-jacking device; d-pad; e-pad. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] An embodiment of the present invention provides a bridge deck top-pushing and high-dropping beam construction method, including a first-stage beam-dropping process and a second-stage beam-dropping process. The method effectively solves the problems of insufficient stability, high risk and complex operation in the high-dropping beam process by dropping the beams in stages.

[0035] Combination Figures 1 to 21 As shown, the first stage of beam dropping process includes:

[0036] A first height-adjustable temporary support 2 and a second height-adjustable temporary support 3 are provided on the concrete beam 1 for supporting the guide beam 4;

[0037] The heights of the first height-adjustable temporary support 2 and the second height-adjustable temporary support 3 are alternately adjusted to be lowered, thereby gradually lowering the height of the guide beam 4 until the guide beam 4 approaches the concrete beam 1 .

[0038] That is to say, first, on the concrete beam 1, according to the design drawings and the actual situation on site, the first height-adjustable temporary support 2 and the second height-adjustable temporary support 3 are accurately installed. These two supports are used to support the guide beam 4 during the first stage of beam placement to ensure its stability. At the same time, ensure that the support structure is firm and reliable, with sufficient load-bearing capacity and adjustment accuracy.

[0039] The operator alternately adjusts and lowers the height of the first height-adjustable temporary support 2 and the second height-adjustable temporary support 3 according to the preset beam-dropping step length. After each adjustment, it is necessary to pause for a while to observe the structural response and make sure that it is stable and without abnormalities before making the next adjustment. As the support height gradually decreases, the guide beam 4 gradually approaches the concrete beam 1. In this process, ensure that the relative position between the guide beam 4 and the concrete beam 1 meets the design requirements to avoid collision or jamming.

[0040] Combination Figures 22 to 37 As shown in the figure, the second stage beam dropping process includes:

[0041] A third height-adjustable temporary support 6 for supporting the steel box girder 9 is provided on the cap beam 5, and a fourth height-adjustable temporary support 8 for supporting the steel box girder 9 is provided on the support 7;

[0042] The guide beam 4 is cut off, and then the heights of the third height-adjustable temporary support 6 and the fourth height-adjustable temporary support 8 are alternately adjusted and lowered, thereby gradually lowering the height of the steel box beam 9 until the steel box beam 9 falls onto the support 7 .

[0043] That is, the third height-adjustable temporary support 6 is installed on the cap beam 5, and the fourth height-adjustable temporary support 8 is installed on the support 7. These two supports are used to support the steel box beam 9 during the second stage of beam dropping to ensure its smooth landing.

[0044] After confirming that the first stage of the beam dropping process is completed, use a cutting tool to cut off the guide beam 4 to separate it from the steel box beam 9. This step should avoid damaging the steel box beam 9. Alternately lower the height of the third height-adjustable temporary support 6 and the fourth height-adjustable temporary support 8. Similarly, operate according to the preset beam dropping step length. As the support height gradually decreases, the steel box beam 9 gradually falls onto the support 7. When approaching the target position, it is necessary to slow down the adjustment step length and make fine adjustments to ensure that the steel box beam 9 falls on the support 7 smoothly and accurately.

[0045] After the beam is dropped, a comprehensive inspection and acceptance work is carried out, including structural dimensions, position accuracy, connection status, etc., to ensure that the construction quality meets the design requirements. After confirming that the structure is stable and meets the use requirements, all temporary support structures are removed and the construction site is restored. The bridge deck top push-up beam drop construction method provided by the present invention can significantly improve the stability and safety of the beam drop process and reduce the risk factor.

[0046] In one achievable embodiment, the first height-adjustable temporary support 2 is composed of a jacking device c and a stack of columns a, a cushion beam b, a plurality of cushion blocks d and / or a plurality of cushion plates e, and the second height-adjustable temporary support 3 is composed of a stack of columns a, a cushion beam b, a plurality of cushion blocks d and / or a plurality of cushion plates e.

[0047] That is to say, the first height-adjustable temporary support 2 is composed of a jacking device c as a core adjustment component, and is composed of a column a, a pad beam b, a plurality of pads d and / or a plurality of pads e stacked together. The jacking device c (such as a hydraulic jack) can accurately control the support height and achieve height adjustment through its jacking and cylinder retracting functions. The column a provides basic support strength, and the pad beam b is used to disperse pressure and increase the stability of the support. The pad d and the pad e are used to fine-tune the support height according to actual needs to ensure the flatness of the support surface and the uniform distribution of the supporting force. The structure of the second height-adjustable temporary support 3 is similar to that of the first height-adjustable temporary support 2, but does not include a jacking device c, and is only composed of a column a, a pad beam b, a plurality of pads d and / or a plurality of pads e stacked together. By increasing or decreasing the number of pads d or pads e, the support height can be manually adjusted to adapt to the height change requirements during the beam dropping process.

[0048] In this embodiment, the heights of the first height-adjustable temporary support 2 and the second height-adjustable temporary support 3 are alternately adjusted and lowered, specifically:

[0049] By utilizing the lifting and retracting cylinder of the lifting device c in the first height adjustable temporary support 2, the heights of the first height adjustable temporary support 2 and the second height adjustable temporary support 3 are alternately lowered, and at the same time, the composition of the first height adjustable temporary support 2 and the second height adjustable temporary support 3 is changed until the guide beam 4 approaches the concrete beam 1.

[0050] For example, Figure 2 As shown, the guide beam 4 is lifted up by using the lifting device c in the first height-adjustable temporary support 2, and a layer of cushion blocks d in the second height-adjustable temporary support 3 is removed; Figure 3 As shown, the lifting device c is lowered, the guide beam 4 falls on the second height-adjustable temporary support 3, and the cushion block d (150 mm) on the first height-adjustable temporary support 2 is removed; Figure 4 As shown, the lifting device c is lifted, and the upper pad d (150 mm) of the second height-adjustable temporary support 3 is removed; Figure 5 As shown, the lifting device c is lowered, and the upper pad d (150 mm) of the first height-adjustable temporary support 2 is removed; Figure 6 As shown, the lifting device c is lifted, and the upper pad d (150 mm) of the second height-adjustable temporary support 3 is removed; Figure 7 As shown, the lifting device c is lowered, and the 0.5m column a at the bottom of the first height-adjustable temporary support 2 is replaced with a cushion block d; Figure 8 As shown, the lifting device c is lifted, and the 1m column at the bottom of the second height-adjustable temporary support 3 is replaced with a 0.5m column + pad; Fig. 9 As shown, the lifting device c is lowered; Fig.10 As shown, the lifting device c is lifted, and the upper layer of cushion blocks (150 mm) of the second height-adjustable temporary support 3 is removed; Fig.11 As shown, the lifting device c is lowered, and the upper layer of cushion blocks (150 mm) of the first height-adjustable temporary support 2 is removed; Fig.12 As shown, lift the lifting device c and remove the upper pad (150mm) of the hand-over measure. Fig.13 As shown, the lifting device c is lowered, and the upper layer of cushion blocks (150 mm) of the first height-adjustable temporary support 2 is removed; Fig.14 As shown, the lifting device c is lifted, and the 0.5m column at the bottom of the second height-adjustable temporary support 3 is replaced with a cushion block; Fig.15 As shown, the lifting device c is lowered, and the cushion beam under the first height-adjustable temporary support 2 is replaced with a cushion block; Fig.16 As shown, the lifting device c is lifted, and the upper layer of cushion blocks (150 mm) of the second height-adjustable temporary support 3 is removed; Fig.17As shown, the lifting device c is lowered, and the upper layer of cushion blocks (150 mm) of the first height-adjustable temporary support 2 is removed; Fig.18 As shown, the lifting device c is lifted, and the upper layer of cushion blocks (150 mm) of the second height-adjustable temporary support 3 is removed; Fig.19 As shown, the lifting device c is lowered, and the upper layer of cushion blocks (150 mm) of the first height-adjustable temporary support 2 is removed; Fig. 20 As shown, the lifting device c is lifted, and the upper layer of cushion blocks (150 mm) of the second height-adjustable temporary support 3 is removed; Fig.21 As shown, the lifting device c is lowered and the load is transferred to the second height-adjustable temporary support 3.

[0051] In one achievable embodiment, the third height-adjustable temporary support 6 is composed of a jacking device c and a stack of columns a, a cushion beam b, a plurality of cushion blocks d and / or a plurality of cushion plates e, and the fourth height-adjustable temporary support 8 is composed of a stack of columns a, a cushion beam b, a plurality of cushion blocks d and / or a plurality of cushion plates e.

[0052] That is to say, the third height-adjustable temporary support 6 is composed of a jacking device c (such as a hydraulic jack), a column a, a cushion beam b, a plurality of cushion blocks d and / or a plurality of cushion plates e stacked. The column a serves as the main structure of the support, the cushion beam b is laid on top of the column a to disperse the pressure, and the cushion blocks d and the cushion plates e are used to accurately adjust the support height. The fourth height-adjustable temporary support 8 is similar to the third height-adjustable temporary support 6. The fourth height-adjustable temporary support 8 is composed of a column a, a cushion beam b, a plurality of cushion blocks d and / or a plurality of cushion plates e stacked, but does not include a jacking device c.

[0053] In this embodiment, the heights of the third height-adjustable temporary support 6 and the fourth height-adjustable temporary support 8 are alternately adjusted and lowered, specifically:

[0054] By utilizing the lifting and retracting cylinder of the lifting device c in the third height adjustable temporary support 6, the heights of the third height adjustable temporary support 6 and the fourth height adjustable temporary support 8 are alternately lowered, and at the same time, the composition forms of the third height adjustable temporary support 6 and the fourth height adjustable temporary support 8 are changed until the steel box girder 9 falls onto the support 7.

[0055] For example, Fig. 22 As shown, a third height-adjustable temporary support 6 is provided on the cap beam 5. Fig.23 As shown, the jacking device c in the third height-adjustable temporary support 6 is lifted to transfer the load of the steel box beam 9 to the cap beam 5. Fig.24 As shown in FIG. 1 , after the load of the steel box beam is transferred to the cap beam, the front and rear guide beams 4 are removed. Fig.25 As shown, the uninstallation starts. Fig.26 As shown in FIG. 1 , the spacer block d on the lifting device c in the third height-adjustable temporary support 6 is removed. Fig. 27 As shown, the 0.5m column in the third height-adjustable temporary support 6 is replaced with a cushion block. Fig.28 As shown in FIG. 1 , the pads on the jacking device c in the third height-adjustable temporary support 6 are removed. Fig.29 As shown, the 1m column in the fourth height-adjustable temporary support 8 is replaced with a 0.5m column. Fig.30 As shown in FIG. 1 , the pads on the jacking device c in the third height-adjustable temporary support 6 are removed. Fig.31 As shown, the 0.5m column in the third height-adjustable temporary support 6 is replaced with a cushion block. Fig.32 As shown in FIG. 1 , the pads on the jacking device c in the third height-adjustable temporary support 6 are removed. Fig.33 As shown, the cushion beam in the third height-adjustable temporary support 6 is replaced with a cushion block. Fig.34 Continue uninstalling as shown. Fig.35 As shown in FIG. 1 , the pads on the jacking device c in the third height-adjustable temporary support 6 are removed. Fig.36 As shown in , unloading continues and the load is transferred to the support. Fig.37 As shown, the lifting device c is removed and the unloading operation is completed.

[0056] Preferably, the top of the first height-adjustable temporary support 2 and the second height-adjustable temporary support 3 are in friction contact with the guide beam 4. The friction contact can increase the contact friction between the support and the guide beam, thereby enhancing the stability of the entire support system and preventing safety accidents caused by unstable support during the beam dropping process.

[0057] Preferably, the third height-adjustable temporary support 6 and the fourth height-adjustable temporary support 8 are in friction contact with the steel box girder 9. Through friction contact, the contact friction between the support and the steel box girder can be significantly increased, thereby enhancing the overall stability of the support system and preventing safety problems caused by unstable support during the beam dropping process.

[0058] Preferably, the jacking device c in the first height-adjustable temporary support 2 and the jacking device c in the third height-adjustable temporary support 6 use a jack. For example, when jacking is required, the jacking function of the jack is activated, and the piston rod of the jack is extended by controlling the hydraulic system, thereby pushing the steel box girder or the supporting structure to rise. When the height of the steel box girder or the supporting structure needs to be lowered, the cylinder retraction operation of the jack is performed, and the piston rod of the jack is retracted by controlling the hydraulic system, thereby achieving a reduction in height. The use of the jack not only simplifies the construction process, but also improves the construction efficiency and quality.

[0059] In one embodiment, the height of column a is 0.5 m or 1 m, and the two can be used together or alone, with good adjustment flexibility.

[0060] Preferably, when column a is at the bottom, column a is fixed to the corresponding contact surface by bolts. Specifically, column a is placed on the contact surface, and its position is adjusted to ensure compliance with design requirements. Position column a using positioning tools (such as positioning pins, templates, etc.) to prevent displacement during the punching process. Use drilling equipment to drill holes that match the diameter of the bolts on column a and the contact surface. Pass the bolts through the holes on column a and the contact surface, and install the nuts. By using bolts to fix column a to the corresponding contact surface, not only the overall stability of the support structure is enhanced, but also the safety during the construction process is improved.

[0061] In the above various implementations, the cushion blocks are composed of cushion blocks of different specifications stacked in a tic-tac-toe pattern.

[0062] The construction method provided in this embodiment is a two-stage beam dropping method, in which temporary supports are removed during the lifting and shrinking of the jack, and the process is repeated until the steel box beam is placed at the support position. In this way, since the temporary support adopts the method of leasing and adding ribs to the existing I-beams, the cost of measures in the beam dropping process is reduced; secondly, the two-stage beam dropping method solves the problem of low stability coefficient of high beam dropping in the prior art, and at the same time, the two-stage beam dropping greatly reduces the construction risk factor. In addition, the two-stage beam dropping method has a large construction operation platform, and the construction operation is relatively convenient, thereby significantly shortening the construction period.

[0063] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 therefore cannot be understood as a limitation on the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A bridge deck top push-up beam drop construction method, characterized in that: It includes the first stage beam dropping process and the second stage beam dropping process; The first stage of beam dropping process includes: A first height-adjustable temporary support (2) and a second height-adjustable temporary support (3) for supporting a guide beam (4) are provided on the concrete beam (1); Alternately adjusting and lowering the height of the first height-adjustable temporary support (2) and the second height-adjustable temporary support (3), thereby gradually lowering the height of the guide beam (4) until the guide beam (4) approaches the concrete beam (1); The second stage beam dropping process includes: A third height-adjustable temporary support (6) for supporting the steel box girder (9) is provided on the cap beam (5), and a fourth height-adjustable temporary support (8) for supporting the steel box girder (9) is provided on the support (7); The guide beam (4) is cut off, and then the heights of the third height-adjustable temporary support (6) and the fourth height-adjustable temporary support (8) are alternately adjusted and lowered, thereby gradually lowering the height of the steel box beam (9) until the steel box beam (9) falls onto the support (7).

2. A bridge deck top push-up beam drop construction method according to claim 1, characterized in that: The first height-adjustable temporary support (2) is composed of a jacking device (c) and a column (a), a cushion beam (b), a plurality of cushion blocks (d) and / or a plurality of cushion plates (e) stacked together, and the second height-adjustable temporary support (3) is composed of a column (a), a cushion beam (b), a plurality of cushion blocks (d) and / or a plurality of cushion plates (e) stacked together.

3. A bridge deck top push-up beam drop construction method according to claim 2, characterized in that: The alternating adjustment reduces the height of the first height-adjustable temporary support (2) and the second height-adjustable temporary support (3), specifically: By utilizing the lifting and retracting cylinder of the lifting device (c) in the first height-adjustable temporary support (2), the heights of the first height-adjustable temporary support (2) and the second height-adjustable temporary support (3) are alternately lowered, and at the same time, the composition of the first height-adjustable temporary support (2) and the second height-adjustable temporary support (3) is changed, until the guide beam (4) approaches the concrete beam (1).

4. A bridge deck top push-up beam drop construction method according to claim 1, characterized in that: The third height-adjustable temporary support (6) is composed of a jacking device (c) and a column (a), a cushion beam (b), a plurality of cushion blocks (d) and / or a plurality of cushion plates (e) stacked together, and the fourth height-adjustable temporary support (8) is composed of a column (a), a cushion beam (b), a plurality of cushion blocks (d) and / or a plurality of cushion plates (e) stacked together.

5. A bridge deck top push-up beam drop construction method according to claim 4, characterized in that: The alternating adjustment reduces the height of the third height-adjustable temporary support (6) and the fourth height-adjustable temporary support (8), specifically: By utilizing the lifting and retracting cylinder of the lifting device (c) in the third height-adjustable temporary support (6), the heights of the third height-adjustable temporary support (6) and the fourth height-adjustable temporary support (8) are alternately lowered, and at the same time, the composition of the third height-adjustable temporary support (6) and the fourth height-adjustable temporary support (8) is changed, until the steel box girder (9) falls onto the support (7).

6. The bridge deck top push-up and beam drop construction method according to claim 1 is characterized in that: The tops of the first height-adjustable temporary support (2) and the second height-adjustable temporary support (3) are in frictional contact with the guide beam (4).

7. The bridge deck top push-up and beam drop construction method according to claim 1 is characterized in that: The third height-adjustable temporary support (6) and the fourth height-adjustable temporary support (8) are in frictional contact with the steel box girder (9).

8. A bridge deck top push-up beam drop construction method according to claim 2 or 4, characterized in that: The lifting device (c) adopts a jack.

9. A bridge deck top push-up beam drop construction method according to claim 2 or 4, characterized in that: The height of the column (a) is 0.5m or 1m.

10. A bridge deck top push-up beam drop construction method according to claim 2 or 4, characterized in that: When the column (a) is located at the bottom, the column (a) is fixed to the corresponding contact surface by bolts.

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