Structure and construction method of thin steel plate for widening new and old bridge

Abstract

The present application belongs to the technical field of bridge engineering, and particularly relates to a structure and a construction method of a new and old bridge widened by thin steel plates. The present application provides a structure of a new and old bridge widened by thin steel plates, which comprises a double-layer vertical clamping plate unit and a single-layer vertical connecting plate unit in a U-shaped plate, so that: 1. the new and old bridge has multiple connection modes in the longitudinal direction of the bridge, thereby ensuring sufficient connection strength; 2. the width direction of the double-layer vertical clamping plate unit and the single-layer vertical connecting plate unit is vertical, thereby providing a large effective connection area vertical size between the new and old bridge. In addition, the present application also provides a construction method of the above structure, which comprises the following steps: a transverse long circular hole is formed on the bent plate, the channel steel and the bottom plate.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge engineering, and particularly relates to a structure and a construction method of a new and old bridge widened by thin steel plates. BACKGROUND

[0002] The construction operation of the widened new and old bridge mainly includes the following specific contents: the old bridge is first repaired and reinforced, then a new bridge is newly built beside the old bridge, and finally the new and old bridges are spliced to increase the number of lanes and meet the traffic demand.

[0003] Generally, the main function of the widened structure between the new and old bridges is to enable the new and old bridges to bear vertical loads together. The widened structure itself mainly includes various connecting parts, including steel plates, steel bars and the like.

[0004] For example, a new and old bridge widened structure disclosed in a Chinese utility model patent with the authorization announcement number CN216275282U and the authorization announcement date April 12, 2022, includes an old hollow slab beam, a widened hollow slab, a sealing assembly for sealing a splicing joint, and a bridge deck structure for preventing cracks on the bridge deck. The bridge deck structure is arranged on the upper surfaces of the old hollow slab beam and the widened hollow slab, the sealing assembly is arranged in the splicing joint, and the top of the sealing assembly protrudes out of the splicing joint, and the protruding part is arranged in the bridge deck structure.

[0005] The general structure principle and advantages of the widened structure in the utility model patent are as follows: the bridge deck structure with a cast-in-place layer and a composite layer, and the sealing assembly with a drainage groove and waterproof material, solve the problems of water leakage and cracks between the old hollow slab beam and the widened hollow slab.

[0006] However, the widened structure has at least the following deficiency in actual use, which is also the technical problem to be solved by the application, i.e.:

[0007] The connecting strength between the old hollow slab beam and the widened hollow slab structure is only realized by the three of the relatively upper steel plate, angle steel and bolt, which is insufficient, so that the middle and lower parts of the hollow slab lack sufficient connecting strength, resulting in that the widened structure cannot bear the vertical load on the bridge together for a long time and stably.

[0008] Therefore, in view of the above, there is an urgent need for a new and old bridge widened structure with relatively large connecting strength and relatively wide effective connecting area. SUMMARY

[0009] The present application provides a kind of thin steel plate structure of new and old bridge splicing width, its structural component includes double-layer vertical clamping plate unit, single-layer vertical connecting plate unit, with U-shaped plate, so that: 1, new and old bridge has multiple, multiple connecting mode in longitudinal bridge direction, enough connecting strength is guaranteed;2, the width direction of double-layer vertical clamping plate unit and single-layer vertical connecting plate unit is vertical, can provide larger effective connecting area vertical dimension between new and old bridge.

[0010] In addition, the present application also provides a kind of construction method of the above structure, its steps include: all being set on the transverse long circular hole of bent plate, channel steel and bottom plate.

[0011] The technical scheme adopted by the present application to solve the above problems is: a kind of thin steel plate structure of new and old bridge splicing width, including double-layer vertical clamping plate unit arranged on the transverse diaphragm of new and old bridge, single-layer vertical connecting plate unit arranged on the web of new and old bridge at both ends, and U-shaped plate arranged on the side of the single-layer vertical connecting plate unit.

[0012] Further preferred technical solutions are that the length direction of the U-shaped plate is vertical.

[0013] Further preferred technical solutions are that the double-layer vertical clamping plate unit includes 2 vertical clamping plates arranged on the two sides of the transverse diaphragm of new and old bridge respectively, and clamping bolt arranged on the two vertical clamping plates and the transverse diaphragm of new and old bridge.

[0014] Further preferred technical solutions are that the single-layer vertical connecting plate unit includes vertical main plate provided with the U-shaped plate, 2 bent plates arranged at both end positions of the vertical main plate respectively, channel steel arranged on the bent plate, 2 bottom plates arranged at both side positions of the channel steel respectively, and end bolt arranged on the bottom plate and used for connecting the web of new and old bridge.

[0015] Further preferred technical solutions are that the single-layer vertical connecting plate unit further includes connecting bolt arranged on the bent plate and channel steel.

[0016] Further preferred technical solutions are that the opposite sides of the two vertical clamping plates are both provided with the U-shaped plate with vertical length direction.

[0017] Further preferred technical solutions are that the U-shaped plates are arranged in pairs inside the two vertical clamping plates, and reinforcing bolt is further arranged on the two U-shaped plates arranged in pairs.

[0018] Further preferred technical solutions are that the U-shaped plates are arranged in pairs inside the two vertical clamping plates, the channel steel and the two bottom plates are integrally formed to form a connecting piece, and the two U-shaped plates arranged in pairs are arranged on the two bottom plates of the connecting piece respectively.

[0019] Further preferred technical solutions are that the bottom plate of the connecting piece is provided with a whole bolt for connecting the pair of U-shaped plates.

[0020] Further preferred technical solutions are that the channel steel of the connecting piece is provided with an anti-falling bolt for supporting the connecting piece on the top edges of the two vertical clamping plates.

[0021] A construction method of a thin steel plate spliced wide new and old bridge, comprising the following steps: a transverse long circular hole is formed on the bending plate, channel steel and bottom plate to allow the new and old bridges to move relative to each other in the longitudinal direction of the bridge. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The position structure schematic diagram of the present application is shown from the top view.

[0023] Figure 2 The position schematic diagram of the single-layer vertical connecting plate unit in the present application.

[0024] Figure 3 The position schematic diagram of the double-layer vertical clamping plate unit in the present application.

[0025] Figure 4 The position schematic diagram of the clamping plate bolt in the present application is shown from the top view.

[0026] Figure 5 The structure schematic diagram of the single-layer vertical connecting plate unit in the present application is shown from the top view.

[0027] Figure 6 The position schematic diagram of the U-shaped plate in the two vertical clamping plates in the present application is shown from the top view.

[0028] Figure 7 The use mode schematic diagram of the connecting piece in the two vertical clamping plates in the present application is shown from the top view.

[0029] Figure 8 The position schematic diagram of the whole bolt in the present application.

[0030] Figure 9 The use method schematic diagram of the connecting piece in the present application.

[0031] Figure 10 The position schematic diagram of the anti-falling bolt in the present application is shown from the top view.

[0032] Figure 11 The structure schematic diagram of the connecting piece in the present application.

[0033] Figure 12 The structure schematic diagram of the U-shaped plate in the present application.

[0034] In the figure, the meanings of the respective marks are as follows:

[0035] Old and new bridge diaphragm a, old and new bridge web b, old and new bridge top plate c, old and new bridge bottom plate d;

[0036] Double-layer vertical clamping plate unit 1, single-layer vertical connecting plate unit 2, U-shaped plate 3, reinforcing bolt 4, integral bolt 5, anti-falling bolt 6;

[0037] Vertical clamping plate 101, clamping plate bolt 102;

[0038] Vertical main plate 201, bent plate 202, channel steel 203, bottom plate 204, end bolt 205, connecting bolt 206. DETAILED DESCRIPTION

[0039] The following description is only a preferred embodiment of the present application, and does not limit the scope of the present application.

[0040] As shown in the accompanying Figures 1-12 A structure for widening old and new bridges by thin steel plates, comprising double-layer vertical clamping plate units 1 arranged on old and new bridge diaphragms a, single-layer vertical connecting plate units 2 arranged at both ends of old and new bridge webs b, and U-shaped plates 3 arranged on the side surfaces of the single-layer vertical connecting plate units 2.

[0041] In this embodiment, the thickness of the steel plates used in the double-layer vertical clamping plate units 1 and the single-layer vertical connecting plate units 2 is ≤2cm, which meets the definition of thin steel plates.

[0042] Among them, the double-layer vertical clamping plate unit 1 is arranged on each of the old and new bridge diaphragms a, and the single-layer vertical connecting plate unit 2 is arranged between 1-3 of the double-layer vertical clamping plate units 1, finally ensuring that the number of the above-mentioned two types of connecting structures arranged between the old and new bridges in the longitudinal direction of the bridge is sufficient and the strength is sufficient.

[0043] And the ratio of the vertical width size of the double-layer vertical clamping plate unit 1 to the vertical width size of the old and new bridge diaphragm a, and the ratio of the vertical width size of the single-layer vertical connecting plate unit 2 to the vertical width size of the old and new bridge web b are both ≥80%, which ensures that the gap between the old and new bridges has a large enough effective connection and widening coverage in the vertical direction.

[0044] In addition, the U-shaped plate 3 serves to structurally reinforce the single-layer vertical connecting plate unit 2 which has relatively low connection strength and self-strength, so that it is not easy to be torn.

[0045] The U-shaped plate 3 is in the shape of an isosceles trapezoid, and the "lower base" of the isosceles trapezoid corresponds to the opening position of the U-shaped plate 3, that is, the shape of the U-shaped plate 3 is "wide outside and narrow inside". The wider opening of the U-shaped plate 3 is arranged on the single-layer vertical connecting plate unit 2 and is welded and fixed with the latter.

[0046] The length direction of the U-shaped plate 3 is vertical.

[0047] In this embodiment, the effect to be achieved by the widened structure is:

[0048] 1. Vertical strong support, the new and old bridges bear vertical load together;

[0049] 2. Allow the new and old bridges to move relatively in the longitudinal direction of the bridge due to inconsistent concrete shrinkage and creep;

[0050] 3. Allow the new and old bridges to move relatively in the transverse direction of the bridge due to inconsistent concrete shrinkage and creep.

[0051] Of course, it needs to be particularly pointed out that the degree of relative movement in the transverse direction of the bridge is much lower than that in the longitudinal direction of the bridge.

[0052] Therefore, if the U-shaped plate 3 is placed horizontally, the structure cannot at least fully allow the new and old bridges to move relatively in the longitudinal direction of the bridge, which will cause the single-layer vertical connecting plate unit 2 to be easily torn and the U-shaped plate 3 to be easily bent, which needs to be avoided.

[0053] On the other hand, the combined structure of the single-layer vertical connecting plate unit 2 and the vertical U-shaped plate 3 can provide sufficient resistance and support strength when the new and old bridges tend to move vertically, and the final effect is as expected: the new and old bridges bear vertical load together.

[0054] The double-layer vertical clamping plate unit 1 includes two vertical clamping plates 101 arranged on the two sides of the new and old bridge diaphragm a respectively, and a clamping bolt 102 arranged on the two vertical clamping plates 101 and the new and old bridge diaphragm a.

[0055] In this embodiment, the vertical clamping plate 101 and the new and old bridge diaphragm a need to be pre-drilled during construction, and the number and position are corresponding, so that the clamping bolt 102 can fully fix the three-layer structure of the two vertical clamping plates 101 and the new and old bridge diaphragm a together.

[0056] Among them, the vertical clamping plate 101 is in the shape of a rectangle, that is, the above-mentioned thin steel plate material, and the clamping bolt 102 is an anchor bolt, which has the advantages of better stability and reliability compared with ordinary bolts and nuts, and is more suitable for concrete and steel structures.

[0057] The single-layer vertical connecting plate unit 2 comprises a vertical main plate 201 provided with the U-shaped plate 3, two bending plates 202 respectively arranged at both ends of the vertical main plate 201, a channel steel 203 arranged on the bending plate 202, two bottom plates 204 respectively arranged at both sides of the channel steel 203, and end bolts 205 arranged on the bottom plate 204 and used for connecting the new and old bridge webs b.

[0058] In the embodiment, the vertical main plate 201 and the bending plate 202 are integrally formed, that is, the initial thin steel plate material, and the channel steel 203 and the bottom plate 204 are also integrally formed, and the shape is generally "U-shaped". The former is connected with the latter, and the latter is fixed on the new and old bridge webs b through the end bolts 205, so as to ensure that the single-layer vertical connecting plate unit 2 has the following basic and designed functions:

[0059] First, it is relatively difficult to deform in the vertical direction unless it is torn, so it can provide a relatively high strength vertical load support effect;

[0060] Second, it is relatively easy to bend in the longitudinal bridge direction, allowing the new and old bridges to relatively move due to the inconsistent shrinkage and creep of the concrete in the longitudinal bridge direction;

[0061] Third, it only has a small tensile deformation effect in the transverse bridge direction, allowing the new and old bridges to relatively move in a small range due to the inconsistent shrinkage and creep of the concrete in the transverse bridge direction.

[0062] Among them, the U-shaped plate 3 is arranged vertically and arranged horizontally in multiple, in order to strengthen the above-mentioned three functions, rather than change the above-mentioned functions. Specifically, the functions of a row of U-shaped plates 3 are as follows:

[0063] a. Increase the difficulty of vertical deformation of the vertical main plate 201, and try to avoid its deformation into a fan ring shape, so as to ensure the vertical support strength;

[0064] b. Increase the difficulty of transverse bending of the vertical main plate 201, because the thin steel plate itself is relatively easy to bend in the transverse direction, and this range is excessive for the relative movement of the new and old bridges in the longitudinal bridge direction;

[0065] c. Increase the difficulty of transverse stretching of the vertical main plate 201, because the thin steel plate itself is also relatively easy to stretch in the transverse direction, and this range is also excessive for the relative movement of the new and old bridges in the transverse bridge direction.

[0066] The single-layer vertical connecting plate unit 2 further comprises connecting bolts 206 arranged on the bending plate 202 and the channel steel 203.

[0067] In the embodiment, the connecting bolt 206 is a common bolt-nut connecting piece. Together with the end bolt 205, it is vertically and uniformly spaced on the whole I-beam 203, floor 204, ensuring that the three parts of the new and old bridge diaphragm a, the whole I-beam 203 and floor 204, the whole vertical main plate 201 and the bent plate 202 are fully connected and fixed.

[0068] The opposite sides of the two vertical clamping plates 101 are provided with the U-shaped plates 3 with the length direction being vertical.

[0069] In the embodiment, the double-layer vertical clamping plate unit 1 and the single-layer vertical connecting plate unit 2 have the same function, which is mainly to provide vertical support and allow longitudinal displacement.

[0070] Therefore, the U-shaped plates 3 can also be arranged on the pair of vertical clamping plates 101 to strengthen but not change the above-mentioned support effect and displacement effect, which is to appropriately "prohibit and refuse" large displacement.

[0071] The U-shaped plates 3 on the two vertical clamping plates 101 are the same in number and aligned in position, so that the two rows of U-shaped plates 3 can be conveniently improved as a whole, and then appropriately strengthened to a certain extent without changing the above-mentioned vertical support and longitudinal displacement.

[0072] The U-shaped plates 3 are arranged in pairs inside the two vertical clamping plates 101, and the pair of U-shaped plates 3 are further provided with reinforcing bolts 4.

[0073] In the embodiment, the first way of the above-mentioned improvement of the two rows of U-shaped plates 3 as a whole is to first punch holes in the middle plates of the U-shaped plates 3 and then install the reinforcing bolts 4, so that the two symmetrical U-shaped plates 3 are connected as a whole, which can be specifically referred to in the attached Figure 6 .

[0074] The U-shaped plates 3 are arranged in pairs inside the two vertical clamping plates 101, and the I-beam 203 and the two floors 204 are integrally formed to form a connecting piece, and the two pairs of U-shaped plates 3 are arranged on the two floors 204 of the connecting piece.

[0075] In the embodiment, the second way of the above-mentioned improvement of the two rows of U-shaped plates 3 as a whole is to simultaneously connect the two floors 204 of the connecting piece to the respective middle plates of the two pairs of U-shaped plates 3, which can be specifically referred to in the attached Figure 7 At this time, the floor 204 and the middle plate of the U-shaped plate 3 can be welded and fixed.

[0076] The base plate 204 of the connector is provided with integral bolts 5 for connecting the pairs of U-shaped plates 3.

[0077] In this embodiment, one variation of the second integrated improvement method described above is as shown in the attached figure. Figure 8 As shown, the above-mentioned connector and integral bolt 5 are used together.

[0078] The second variation is as shown in the attached image. Figure 9 As shown, the two right-angled outer edges of the channel steel 203 in the above-mentioned connector abut against the two adjacent U-shaped plates 3 respectively, so that the two rows of U-shaped plates 3 and the one row of the above-mentioned connector can be connected into an integral structure.

[0079] Thus, all of the above methods can strengthen the double-layer vertical clamping plate unit 1, making its vertical support strength significantly improved and the degree of longitudinal relative displacement allowed between new and old bridges reduced as needed.

[0080] The channel steel 203 of the connector is provided with anti-fall bolts 6 for supporting the connector on the top edges of the two vertical clamping plates 101.

[0081] In this embodiment, as shown in the appendix Figure 10 As shown, the setting of the anti-falling bolt 6 is the third variation of the second integrated improvement method mentioned above.

[0082] At this time, the two base plates 204 of the above-mentioned connector can be welded or screwed together with the U-shaped plate 3, and / or the channel steel 203 can be clamped against the two adjacent U-shaped plates 3, and the anti-falling effect is finally provided by the anti-falling bolt 6.

[0083] Correspondingly, the size of the anti-fall bolt 6 is significantly larger than that of the integral bolt 5, and the former can also be a simple bolt and nut combination.

[0084] A construction method for widening a new and old bridge using thin steel plates includes the following steps: opening transverse elongated holes in the bent plate, channel steel, and base plate to allow relative movement between the new and old bridges in the longitudinal direction.

[0085] In this embodiment, as shown in the appendix Figure 11 As shown, the channel steel 203 and the base plate 204 are provided with a total of 3 rows of transverse elongated holes, so that the relative movement of the new and old bridges in the longitudinal direction does not require the application of transverse bending deformation to the double-layer vertical clamping plate unit 1 and the single-layer vertical connecting plate unit 2. At least, the amount of relative movement does not need to be entirely borne by the transverse bending deformation of the double-layer vertical clamping plate unit 1 and the single-layer vertical connecting plate unit 2, thus ultimately extending the effective service life of the connection structure of the latter two.

[0086] On the other hand, the above-mentioned transverse long circular hole mode can be combined with the mode that the double-layer vertical clamping plate unit 1 and the single-layer vertical connecting plate unit 2 allow transverse bending deformation, and the two modes are combined to ensure that the relative movement amount of the new and old bridges in the longitudinal direction can be met.

[0087] Of course, correspondingly, the end bolt 205 cannot completely press the bottom plate 204 at this time, and the bottom plate 204 needs to be displaced along the longitudinal direction on the web b of the new and old bridges.

[0088] The groove steel 203 and the bottom plate 204 connector used in the double-layer vertical clamping plate unit 1 also has the above-mentioned transverse long circular hole, and whether the connector is movable in the double-layer vertical clamping plate unit 1 does not affect the following functions:

[0089] The whole reinforcement, vertical support reinforcement, and longitudinal relative displacement still allow the basic function.

[0090] The embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the above-mentioned embodiments, and various modifications can be made within the knowledge of those skilled in the art in the technical field without departing from the purpose of the application. These are not creative modifications, and as long as they are within the scope of the claims of the application, they are protected by the patent law.

Claims

1. A structure for widening old and new bridges using thin steel plates, characterized in that: The utility model relates to a vertical connecting plate unit for connecting new and old bridges, which comprises a double-layer vertical clamping plate unit (1) arranged on the transverse plate (a) of the new and old bridges, a single-layer vertical connecting plate unit (2) arranged at the two ends of the web plate (b) of the new and old bridges, and a U-shaped plate (3) arranged on the side of the single-layer vertical connecting plate unit (2), The length direction of the U-shaped plate (3) is vertical, The double-layer vertical clamping plate unit (1) comprises two vertical clamping plates (101) arranged on the two sides of the transverse plate (a) of the new and old bridges respectively, and clamping plate bolts (102) arranged on the two vertical clamping plates (101) and the transverse plate (a) of the new and old bridges, The single-layer vertical connecting plate unit (2) comprises a vertical main plate (201) provided with the U-shaped plate (3), two bending plates (202) arranged at the two end positions of the vertical main plate (201) respectively, a channel steel (203) arranged on the bending plate (202), two bottom plates (204) arranged at the two side positions of the channel steel (203) respectively, and end bolts (205) arranged on the bottom plates (204) and used for connecting the web plates (b) of the new and old bridges, The opposite sides of the two vertical clamping plates (101) are provided with the U-shaped plates (3) with a vertical length direction, The U-shaped plates (3) are arranged in pairs inside the two vertical clamping plates (101), and reinforcing bolts (4) are further arranged on the two U-shaped plates (3) arranged in pairs, or the U-shaped plates (3) are arranged in pairs inside the two vertical clamping plates (101), the channel steel (203) and the two bottom plates (204) are integrally formed to form a connecting piece, the connecting pieces are arranged between adjacent two pairs of U-shaped plates (3), and the adjacent two pairs of U-shaped plates (3) are arranged on the two bottom plates (204) of the connecting pieces respectively.

2. A structure for widening old bridge with thin steel plates according to claim 1, characterized in that: The single-layer vertical connecting plate unit (2) further comprises connecting bolts (206) arranged on the bending plates (202) and the channel steel (203).

3. The structure for widening the new and old bridge by thin steel plates according to claim 1, wherein: The bottom plate (204) of the connecting piece is provided with a whole bolt (5) used for connecting the two U-shaped plates (3) arranged in pairs.

4. The structure for widening the new and old bridge by thin steel plates according to claim 1, wherein: The channel steel (203) of the connecting piece is provided with an anti-falling bolt (6) used for supporting the connecting piece on the top edges of the two vertical clamping plates (101).

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