A new and old bridge buffering and limiting connection method and connection structure

Abstract

The application relates to a new and old bridge buffering and limiting connecting method and connecting structure. A buffering and limiting connecting piece is connected between a new bridge and an old bridge, the buffering and limiting connecting piece is composed of a new bridge connecting rigid connecting piece, an old bridge connecting rigid connecting piece and an elastic body, the new bridge connecting rigid connecting piece is connected with the new bridge, the old bridge connecting rigid connecting piece is connected with the old bridge, there are upper and lower gaps reserved by rigid connecting pieces between the new bridge connecting rigid connecting piece and the old bridge connecting rigid connecting piece, and the elastic body is connected between the new bridge connecting rigid connecting piece and the old bridge connecting rigid connecting piece. Compared with the prior art, the application provides a new and old bridge buffering and limiting connecting method, a gap is reserved in the buffering and limiting connecting piece, a part of deformation difference can be absorbed, and the shearing action borne by the old bridge is reduced. Meanwhile, the reserved gap can be customized according to the demand of the old bridge, and the splicing demand of new and old bridges with different spans is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new and old bridge splicing, in particular to a new and old bridge buffering and limiting connection method and connection structure. BACKGROUND

[0002] In reconstruction and expansion projects, some projects use the method of splicing new and old bridges together to improve the traffic capacity of the bridge surface. However, due to the early construction of the old bridge and the low technical specifications, after splicing, the wing plate is easily subjected to large adverse effects under the action of eccentric load and new bridge settlement. Some projects use the method of not connecting to completely release the constraints of new and old bridges, but the new bridge continues to settle, resulting in a height difference on both sides. During driving, there will also be a large deflection difference on the left and right sides, which can easily lead to unstable wheels and pose a safety hazard.

[0003] Patent CN202111477964.1 discloses a new and old bridge widening structure that adapts to multi-directional displacement. This patent is a method that completely releases the constraints of new and old bridges. Patent CN201420308512.X discloses a new and old bridge longitudinal elastic concrete flexible splicing structure. This patent is based on elastic concrete and adapts to the deflection difference between new and old bridges to improve the smoothness of the bridge surface. The above patents have safety hazards when there is a large deformation difference, or use elastic concrete buffering methods, but the adaptation range of deformation is limited. SUMMARY

[0004] Based on the current situation of safety hazards or limited adaptation range of deformation in existing new and old bridge connection methods, the present application provides a new and old bridge buffering and limiting connection method and connection structure.

[0005] The new and old bridge buffering and limiting connection method and connection structure provided by the present application seek a balance between driving safety and structural safety. In the case of a small deflection difference, the structure deforms itself, and when the deflection difference reaches a certain step, the structure participates in the stress, ensuring the smoothness of the bridge surface and meeting the stress safety of the structure.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] The present application provides a new and old bridge buffering and limiting connection method, comprising the following steps:

[0008] The buffer limiting connecting piece is connected between the new bridge and the old bridge, and is composed of a connecting new bridge rigid connecting piece, a connecting old bridge rigid connecting piece and an elastic body, the connecting new bridge rigid connecting piece is connected with the new bridge, the connecting old bridge rigid connecting piece is connected with the old bridge, there are a rigid connecting piece reserved upper gap and a rigid connecting piece reserved lower gap between the connecting new bridge rigid connecting piece and the connecting old bridge rigid connecting piece, and the elastic body is connected between the connecting new bridge rigid connecting piece and the connecting old bridge rigid connecting piece;

[0009] After the old bridge is subjected to the load, the elastic body is deformed, the rigid connecting piece reserved upper gap is compressed, the connecting new bridge rigid connecting piece and the connecting old bridge rigid connecting piece are in abutment, and the load starts to be transmitted between the new bridge and the old bridge.

[0010] After the new bridge is subjected to the load, the elastic body is deformed, the rigid connecting piece reserved lower gap is compressed, the connecting new bridge rigid connecting piece and the connecting old bridge rigid connecting piece are in abutment, and the load starts to be transmitted between the new bridge and the old bridge.

[0011] In one embodiment of the present application, after the new bridge and the old bridge are connected, the elastic body is compressed and deformed after the old bridge is subjected to the load, and if the deformation of the elastic body is smaller than the rigid connecting piece reserved upper gap, the load is not transmitted between the new bridge and the old bridge; if the deformation of the elastic body is larger than the rigid connecting piece reserved upper gap, the connecting new bridge rigid connecting piece and the connecting old bridge rigid connecting piece are in abutment, and the load starts to be transmitted between the new bridge and the old bridge, but the maximum load does not exceed the allowable load of the old bridge.

[0012] In one embodiment of the present application, after the new bridge is settled, the elastic body is stretched and deformed, the rigid connecting piece reserved lower gap of the bridge end buffer limiting connecting piece is compressed to 0, and the rigid connecting piece reserved lower gap of the bridge midspan buffer limiting connecting piece becomes the maximum deformation of the design live load minus the theoretical allowable deformation of the new bridge flange plate; after the new bridge is subjected to the load, the elastic body continues to be stretched and deformed, the connecting new bridge rigid connecting piece and the connecting old bridge rigid connecting piece are in abutment, and the load starts to be transmitted between the new bridge and the old bridge, but the maximum load does not exceed the allowable load of the new bridge.

[0013] In one embodiment of the present application, the buffer limiting connecting pieces are arranged along the bridge span direction of the old bridge, and one row is arranged at intervals of 1-2 m.

[0014] In one embodiment of the present application, the rigid connecting piece reserved upper gaps of different buffer limiting connecting pieces are different along the bridge span direction of the old bridge, and the value curve is determined by using a sine function, and the formula is as follows:

[0015]

[0016] In the formula, a is the maximum deformation of the design live load, b is the theoretical allowable deformation of the new bridge flange plate, and c is the allowable load of the old bridge.

[0017] Δ1 - the value curve of the upper gap reserved by the rigid connecting piece;

[0018] x—— x is the distance from the beam section;

[0019] L bridge span;

[0020] delta 1 - the maximum value of the middle gap reserved by the rigid connecting piece, which is the maximum deformation of the design live load minus the theoretical allowable deformation of the old bridge flange plate.

[0021] In an embodiment of the present application, the lower gaps reserved by the rigid connecting pieces of different buffer limiting connecting pieces are different along the bridge span direction of the old bridge, and the value curve is determined by a sine function, as follows:

[0022]

[0023] In the formula:

[0024] Δ2 - the value curve of the lower gap reserved by the rigid connecting piece;

[0025] x—— x is the distance from the beam section;

[0026] L bridge span;

[0027] delta 2 - the maximum value of the middle gap reserved by the rigid connecting piece, which is the maximum deformation of the design live load minus the theoretical allowable deformation of the new bridge flange plate plus the end value of the lower gap reserved by the rigid connecting piece; that is, the maximum value of the middle gap reserved by the rigid connecting piece = the maximum deformation of the design live load - the theoretical allowable deformation of the new bridge flange plate + the end value of the lower gap reserved by the rigid connecting piece.

[0028] delta 3 - the end value of the lower gap reserved by the rigid connecting piece, which is the estimated settlement of the new bridge.

[0029] In an embodiment of the present application, the lower gap reserved by the rigid connecting piece of the buffer limiting connecting piece at the end of the bridge span gradually decreases during the settlement of the new bridge, which also shows the decrease of the lower gap reserved by the rigid connecting piece at the end of the bridge span, and the old bridge is not affected by the settlement of the new bridge.

[0030] In an embodiment of the present application, the rigid connecting piece connecting the old bridge is provided with an opening, and the rigid connecting piece connecting the new bridge is provided with a limiting plate at one end, which is located in the rigid connecting piece connecting the old bridge and does not come off from the rigid connecting piece connecting the old bridge.

[0031] In one embodiment of the present application, the elastic body is an elastic medium such as a spring or rubber.

[0032] The application further provides a new and old bridge buffering and limiting connecting structure, which comprises a new bridge and an old bridge, the new bridge and the old bridge are connected through a buffering and limiting connecting piece, the buffering and limiting connecting piece is composed of a new bridge connecting rigid connecting piece, an old bridge connecting rigid connecting piece and an elastic body, the new bridge connecting rigid connecting piece is connected with the new bridge, the old bridge connecting rigid connecting piece is connected with the old bridge, there are a rigid connecting piece reserved upper gap and a rigid connecting piece reserved lower gap between the new bridge connecting rigid connecting piece and the old bridge connecting rigid connecting piece, and the elastic body is connected between the new bridge connecting rigid connecting piece and the old bridge connecting rigid connecting piece.

[0033] Compared with the prior art, the application has the following advantages and beneficial effects:

[0034] 1. The method provided by the application can adapt to the deformation difference through the deformation of the elastic body when the deformation difference is small, the rigid body automatically stops when the gap compression is 0, and the new and old bridges start to transmit force; in the traditional complete connection mode, the load effect is large between structures, and there are problems in wing plate crack resistance and safety, and in the non-connected mode, large error table phenomena can be caused under the action of settlement and live load, which constitutes a hidden danger for driving; the scheme provided by the application balances the smoothness of the bridge deck and the bidirectional demand of structure stress.

[0035] 2. According to the different technical characteristics of the new and old bridges, the rigid connecting piece reserved gap in the scheme of the application is more flexible and controllable than other splicing methods; firstly, the end reserved gap can completely release the settlement deformation of the new bridge and will not generate internal force effect due to settlement, and secondly, the reserved gap is set to be different according to the deformation amount, the reserved gap near the bridge span end is small, and the reserved gap near the bridge span middle is large, so that under the action of load, better stress and force transmission can be achieved.

[0036] 3. The method provided by the application has a bidirectional load reduction effect on the new and old bridges, and realizes the simplest structure and the best function.

[0037] In summary, the application provides a new and old bridge buffering and limiting connecting method, a reserved gap is arranged in the buffering and limiting connecting piece, a part of deformation difference can be absorbed, and the shear effect borne by the old bridge is reduced. Meanwhile, the reserved gap can be customized according to the demand of the old bridge, and the splicing demand of new and old bridges with different spans can be met. BRIEF DESCRIPTION OF DRAWINGS

[0038] ATTACHMENT Figure 1 is a general layout diagram (before deformation) for splicing new and old bridges;

[0039] ATTACHMENT Figure 2It is the overall layout drawing of new and old bridge splicing (old bridge after deformation);

[0040] Attached Figure 3 It is the overall layout drawing of new and old bridge splicing (new bridge after deformation);

[0041] Attached Figure 4 It is the principle drawing of buffer limiting connecting piece (before deformation);

[0042] Attached Figure 5 It is the principle drawing of buffer limiting connecting piece (old bridge after deformation);

[0043] Attached Figure 6 It is the principle drawing of buffer limiting connecting piece (new bridge after deformation);

[0044] Attached Figure 7 It is the reserved upper gap value curve of rigid connecting piece;

[0045] Attached Figure 8 It is the reserved lower gap value curve of rigid connecting piece.

[0046] The symbols in the figure are shown:

[0047] 1, new bridge, 2, old bridge, 3, buffer limiting connecting piece; 22, bridge span; 31 connecting new bridge rigid connecting piece; 32, connecting old bridge rigid connecting piece; 33, elastic body; 34, rigid connecting piece reserved upper gap; 35, rigid connecting piece reserved lower gap; 341, rigid connecting piece reserved upper gap mid-span maximum value; 351, rigid connecting piece reserved lower gap mid-span maximum value; 352, rigid connecting piece reserved lower gap end value. DETAILED DESCRIPTION

[0048] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0049] EMBODIMENT

[0050] Reference Figures 1-8 , the embodiment provides a new and old bridge buffer limiting connecting method, comprising the following steps:

[0051] Connecting between new bridge 1, old bridge 2 through buffer limiting connecting piece 3, the buffer limiting connecting piece 3 is composed of connecting new bridge rigid connecting piece 31, connecting old bridge rigid connecting piece 32 and elastic body 33, the connecting new bridge rigid connecting piece 31 is connected with new bridge 1, the connecting old bridge rigid connecting piece 32 is connected with old bridge 2, there is rigid connecting piece reserved upper gap 34 and rigid connecting piece reserved lower gap 35 between the connecting new bridge rigid connecting piece 31 and the connecting old bridge rigid connecting piece 32, the elastic body 33 is connected between the connecting new bridge rigid connecting piece 31 and the connecting old bridge rigid connecting piece 32; The buffer limiting connecting piece 3 is arranged along the bridge span 22 direction of old bridge 2, and one row is arranged at intervals of 1-2 m.

[0052] After the new and old bridges are connected, the old bridge 2 is under load, the elastomer 33 is compressed and deformed, the reserved upper gap 34 of the rigid connecting piece is compressed, if the deformation of the elastomer 33 is less than the reserved upper gap 34 of the rigid connecting piece, the new and old bridges do not transmit force; if the deformation of the elastomer 33 is greater than the reserved upper gap 34 of the rigid connecting piece, the rigid connecting piece 31 of the connecting new bridge and the rigid connecting piece 32 of the connecting old bridge are deadlocked, and the new and old bridges start to transmit load, but the maximum load does not exceed the allowable load of the old bridge.

[0053] After the new bridge 1 is settled, the elastomer 33 is stretched and deformed, the reserved lower gap 35 of the rigid connecting piece of the bridge span end buffer limiting connecting piece 3 is compressed to 0, and the reserved lower gap 35 of the rigid connecting piece of the bridge span middle buffer limiting connecting piece 3 is the maximum deformation of the design live load minus the theoretical allowable deformation of the new bridge flange plate; under the action of the load of the new bridge 1, the elastomer 33 at the non-bridge span end continues to stretch and deform, the rigid connecting piece 31 of the connecting new bridge and the rigid connecting piece 32 of the connecting old bridge are deadlocked, and the new and old bridges start to transmit load, but the maximum load does not exceed the allowable load of the new bridge.

[0054] In the direction of the bridge span 22 of the old bridge 2, the reserved upper gaps 34 of the rigid connecting pieces of different buffer limiting connecting pieces 3 are different, and the value curve of the reserved upper gaps 34 is determined by a sine function, and the formula is as follows:

[0055]

[0056] In the formula, x is the distance from the bridge span end, that is, the distance from the beam section;

[0057] Δ1 is the value curve of the reserved upper gap 34 of the rigid connecting piece;

[0058] x—— In the formula, x is the distance from the bridge span end, that is, the distance from the beam section;

[0059] L L is the bridge span 22;

[0060] delta 1 is the maximum value 341 of the reserved upper gap of the rigid connecting piece in the middle of the bridge span, which is the maximum deformation of the design live load minus the theoretical allowable deformation of the old bridge flange plate.

[0061] In the direction of the bridge span 22 of the old bridge 2, the reserved lower gaps 35 of the rigid connecting pieces of different buffer limiting connecting pieces 3 are different, and the value curve of the reserved lower gaps 35 is determined by a sine function, and the formula is as follows:

[0062]

[0063] In the formula, x is the distance from the bridge span end, that is, the distance from the beam section;

[0064] Δ2 is the value curve of the reserved lower gap 35 of the rigid connecting piece;

[0065] x—— The distance from the end of the bridge span, that is, x is the distance from the beam section;

[0066] L The bridge span 22;

[0067] delta 2 The maximum value of the reserved gap in the middle of the rigid connector 351 is the maximum deformation of the design live load minus the theoretical allowable deformation of the new bridge flange plate plus the end value of the reserved gap of the rigid connector 352, that is, the maximum value of the reserved gap in the middle of the rigid connector 351 = the maximum deformation of the design live load - the theoretical allowable deformation of the new bridge flange plate + the end value of the reserved gap of the rigid connector 352;

[0068] delta 3 The end value of the reserved gap of the rigid connector 352 of the buffer limiting connector 3 at the end of the bridge span gradually decreases during the settlement of the new bridge 1, which also shows the decrease of the reserved gap of the rigid connector 35 at the end of the bridge span, and the old bridge 2 is not affected by the settlement of the new bridge 1.

[0069] In this embodiment, the end value of the reserved gap of the rigid connector 352 of the buffer limiting connector 3 at the end of the bridge span gradually decreases during the settlement of the new bridge 1, which also shows the decrease of the reserved gap of the rigid connector 35 at the end of the bridge span, and the old bridge 2 is not affected by the settlement of the new bridge 1.

[0070] In this embodiment, the connecting old bridge rigid connector 32 is provided with an opening, and the connecting new bridge rigid connector 31 is provided with a limiting plate at one end, which is located in the connecting old bridge rigid connector 32 and cannot be separated from the connecting old bridge rigid connector 32. The elastic body 33 is a spring.

[0071] This embodiment also provides a new and old bridge buffer limiting connection structure, which comprises a new bridge 1 and an old bridge 2, wherein the new bridge 1 and the old bridge 2 are connected through a buffer limiting connector 3, the buffer limiting connector 3 is composed of a connecting new bridge rigid connector 31, a connecting old bridge rigid connector 32 and an elastic body 33, the connecting new bridge rigid connector 31 is connected with the new bridge 1, the connecting old bridge rigid connector 32 is connected with the old bridge 2, there is a rigid connector reserved gap 34 and a rigid connector reserved gap 35 between the connecting new bridge rigid connector 31 and the connecting old bridge rigid connector 32, and the elastic body 33 is connected between the connecting new bridge rigid connector 31 and the connecting old bridge rigid connector 32.

[0072] The foregoing description of the embodiments has been presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the application to the precise form disclosed. Modifications and variations are possible in light of the above teachings or can be acquired from practice of the application. As well, the description is presented in the context of the preferred embodiments as a number of alternatives. It is not intended to limit the application to the precise form described.

Claims

1. A new and old bridge buffering and limiting connection method, characterized in that, It comprises the following steps: The buffer limiting connecting piece (3) is connected between the new bridge (1) and the old bridge (2), and is composed of a connecting new bridge rigid connecting piece (31), a connecting old bridge rigid connecting piece (32) and an elastic body (33). The connecting new bridge rigid connecting piece (31) is connected with the new bridge (1), the connecting old bridge rigid connecting piece (32) is connected with the old bridge (2), and the connecting new bridge rigid connecting piece (31) and the connecting old bridge rigid connecting piece (32) are connected through the rigid connecting piece reserved upper gap (34) and the rigid connecting piece reserved lower gap (35), and the elastic body (33) is connected between the connecting new bridge rigid connecting piece (31) and the connecting old bridge rigid connecting piece (32). After the old bridge (2) is subjected to load, the elastic body (33) deforms, the rigid connecting piece reserved upper gap (34) is compressed, the connecting new bridge rigid connecting piece (31) and the connecting old bridge rigid connecting piece (32) are connected, and load begins to be transmitted between the new bridge and the old bridge. After the new bridge (1) is subjected to load, the elastic body (33) deforms, the rigid connecting piece reserved lower gap (35) is compressed, the connecting new bridge rigid connecting piece (31) and the connecting old bridge rigid connecting piece (32) are connected, and load begins to be transmitted between the new bridge and the old bridge.

2. The method for connecting the old bridge to the new bridge according to claim 1, characterized in that, The buffer limiting connecting piece (3) is arranged along the bridge span (22) direction of the old bridge (2), and one row is arranged at intervals of 1-2 m.

3. The method of claim 1, wherein, Along the bridge span (22) direction of the old bridge (2), the rigid connecting piece reserved upper gaps (34) of different buffer limiting connecting pieces (3) are different, and the value curve is determined by a sine function, and the formula is as follows: In the formula, Δ1 is the value curve of the rigid connecting piece reserved upper gap (34); x—— L is the distance from the end of the bridge span; L — a bridge span (22); Along the bridge span (22) direction of the old bridge (2), the rigid connecting piece reserved lower gaps (35) of different buffer limiting connecting pieces (3) are different, and the value curve is determined by a sine function, and the formula is as follows: 1 - The maximum value of the gap reserved for the rigid connection (341) is the maximum deformation of the design live load minus the theoretical allowable deformation of the old bridge flange plate.

4. The method of claim 1, wherein, In the formula, Δ2 is the value curve of the rigid connecting piece reserved lower gap (35); Along the bridge span (22) direction of the old bridge (2), the rigid connecting piece reserved lower gaps (35) of different buffer limiting connecting pieces (3) are different, and the value curve is determined by a sine function, and the formula is as follows: x—— L is the distance from the end of the bridge span; L - a bridge span (22); In the formula, 2 - The maximum value of the gap reserved for the rigid connector in the middle of the span (351) is obtained by subtracting the theoretical allowable deformation of the new bridge flange plate from the maximum deformation of the design live load and adding the value of the gap at the end of the rigid connector (352): The buffer limiting connecting piece (3) is arranged along the bridge span (22) direction of the old bridge (2), and one row is arranged at intervals of 1-2 m. 3 - The value of the gap at the end of the rigid link (352) is the estimated settlement of the new bridge.

5. The method for connecting the old bridge with the new bridge according to claim 4, characterized in that, The connecting old bridge rigid connecting piece (32) is provided with an opening, and the connecting new bridge rigid connecting piece (31) is provided with a limiting plate at one end, which is located in the connecting old bridge rigid connecting piece (32) and cannot be separated from the connecting old bridge rigid connecting piece (32).

6. The method of claim 1, wherein, The elastic body (33) is a spring or rubber.

7. The method of claim 1, wherein, ​ 8. A new and old bridge buffering and limiting connecting structure, characterized in that, Including new bridge (1) with old bridge (2), new bridge (1) with old bridge (2) between through buffer limiting connecting piece (3) is connected, buffer limiting connecting piece (3) is composed of connecting new bridge rigid connecting piece (31), connecting old bridge rigid connecting piece (32) and elastomer (33), connecting new bridge rigid connecting piece (31) is connected with new bridge (1), connecting old bridge rigid connecting piece (32) is connected with old bridge (2), there is rigid connecting piece reserved upper gap (34) and rigid connecting piece reserved lower gap (35) between connecting new bridge rigid connecting piece (31) and connecting old bridge rigid connecting piece (32), elastomer (33) is connected between connecting new bridge rigid connecting piece (31) and connecting old bridge rigid connecting piece (32).

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