Structure for widening new bridge and old bridge flexibly by adopting telescopic steel bars

Abstract

The utility model belongs to the technical field of bridge engineering, and particularly relates to a structure for widening a new bridge and an old bridge flexibly by adopting telescopic steel bars, which comprises a bridge web, a mounting groove, a fixing plate unit, the steel bars, pipe bodies and a tensile combination block unit, so that 1, a combined sleeving structure of a plurality of steel bars and a plurality of pipe bodies has enough flexible deformation capability, and the tensile combination block unit can be used for widening the new bridge and the old bridge; the new and old bridges are allowed to generate proper relative displacement in the vertical direction and the longitudinal direction; 2, the combined sleeving structure is still an integrated connecting structure, so that the vertical load can be fully transmitted, and the old bridge is further protected; 3, the new bridge and the old bridge are difficult to be far away from each other greatly in the transverse bridge direction, so that the basic function of widening connection is realized; and 4, when the fixing plate unit is installed, the new and old bridge structures do not need to be greatly changed, and the structural strength of the new and old bridges cannot be greatly damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering, and particularly relates to a structure for flexibly widening a new and old bridge by using a telescopic steel rod. Background Art

[0002] The purpose of widening the old and new bridges is to strengthen the old bridge and add lanes. The general construction steps are: repair and strengthen the old bridge, build the new bridge, and set connectors between the old and new bridges. The length direction of the connectors is the transverse direction of the bridge, and one or more rows are evenly arranged in a linear manner in the longitudinal direction of the bridge, or in the longitudinal direction and vertical direction.

[0003] The opposite of the flexible widening concept mentioned above is the rigid widening. Generally speaking, the similarities between the two include: both are installed on the web of the bridge, both can transmit vertical loads, and both can limit the relative displacement of the new and old bridges in the horizontal and longitudinal directions. Among them, the flexible widening method is more suitable for the mode between the new and old bridges, where only the lower part is connected and traffic is not interrupted, while the rigid widening method is more suitable for the mode between the new and old bridges, where both the upper and lower parts are connected and traffic needs to be interrupted. Each has its advantages and disadvantages, and each has its own applicable scenarios.

[0004] The difference is that the rigid widening method is relatively stronger, can transmit relatively more vertical loads, and allows the new and old bridges to have relatively smaller relative displacements in the horizontal and longitudinal directions. Common rigid widening methods include: widening of steel-concrete structures, widening of large steel pipes and steel frames, etc. Retractable steel rods are one of the common methods of flexible widening mentioned above, and their functional characteristics mainly include: appropriate transmission of vertical loads, allowing appropriate relative displacement of the new and old bridges in the longitudinal direction, and mainly limiting the relative distance between the new and old bridges in the horizontal direction. Among them, without installing connectors, the above-mentioned relative displacement in the longitudinal direction is inevitable, and the rigid widening method only strongly limits this relative displacement through its own greater structural strength.

[0005] For example, the Chinese utility model patent with authorization announcement number CN208949745U and authorization announcement date 2019.06.07 discloses a bridge widening structure that meets the settlement difference between the old and new bridges, including an old bridge, a new bridge, angle steels and connectors; the connectors include connecting steel plates, embedded steel bars, embedded steel plates, bolt connection assemblies and isolation layers; the bolt connection assemblies include screws, nuts I, nuts II and pads; round-ended rectangular holes are opened on the embedded steel plates; and a longitudinal seam is formed along the direction of the bridge between the old bridge and the new bridge.

[0006] The bridge widening structure in this utility model patent has the following general structural principles and advantages: The new bridge and the old bridge are fixedly connected together through connecting pieces, and round-ended rectangular holes for the up-and-down movement of the bolt connection assembly are provided on the embedded steel plates, which can not only meet the vertical settlement difference between the new and old bridges, but also ensure the firm connection of the new and old bridges in the longitudinal and transverse directions of the bridge. This bridge widening structure can effectively avoid the cracking and damage of the upper structure beam body and the bridge deck pavement layer caused by the settlement difference between the new and old bridges. It has a simple structure, reasonable design, and is safe and reliable.

[0007] However, during the actual use of this bridge widening structure, there are at least the following two deficiencies, which are also the technical problems to be solved by this utility model, namely:

[0008] First, the setting of the round-ended rectangular holes allows the settlement difference between the new and old bridges, but at the same time, the vertical load transfer capacity of this widening structure is almost non-existent. This is relatively dangerous for the old bridge with relatively low structural strength. The load of the passing vehicles on it is still supported independently by itself, and this widening structure cannot play a role in protecting the old bridge.

[0009] Second, this widening structure requires inserting large-sized and numerous embedded steel bars and embedded steel plates into the new and old bridges. The construction difficulty of this step is relatively large, and the construction operation itself will also damage and reduce the structural strength of the new and old bridges themselves. This is not practical.

[0010] Therefore, in summary, there is an urgent need for a new type of flexible widening structure that can appropriately transfer vertical loads, allow appropriate relative displacement between the new and old bridges, and has a relatively simple installation method for use in the construction operation of widening new and old bridges. Summary of the Utility Model

[0011] This utility model provides a structure for flexibly widening new and old bridges using retractable steel bars. The structure includes: bridge webs, installation grooves, fixing plate units, steel bars, pipe bodies, and tensile combination block units, such that: 1. The combined socket structure of multiple steel bars and multiple pipe bodies has sufficient flexible deformation ability to allow appropriate relative displacement between the new and old bridges in the vertical and longitudinal directions of the bridge; 2. The above combined socket structure is still an integral connection structure, so it can fully transfer vertical loads and thus protect the old bridge; 3. It is difficult for the new and old bridges to move relatively far away from each other significantly in the transverse direction of the bridge, enabling the basic function of widening connection to be realized; 4. When installing the fixing plate unit, it is not necessary to make major modifications to the structures of the new and old bridges, and it will not significantly damage the structural strength of the new and old bridges themselves.

[0012] The technical solution adopted by the present utility model to solve the above problems is as follows: It adopts a structure of a retractable steel rod for flexibly widening the new and old bridges, including two bridge webs, and further includes mounting grooves provided on the bridge webs, two fixing plate units respectively provided on the two bridge webs and connecting the mounting grooves, several steel rods provided between the two fixing plate units, pipe bodies respectively connecting adjacent two of the steel rods at both ends, and tensile combination block units provided in the pipe bodies and connecting the steel rods.

[0013] A further preferred technical solution lies in that: the fixing plate unit includes an opening plate provided on the bridge web and connecting the steel rod at the connecting end position, and an expansion bolt inserted on the opening plate and connecting the mounting groove.

[0014] A further preferred technical solution lies in that: the fixing plate unit further includes a flared groove at the outer end of the hole provided on the opening plate and used for adding a glue block for bolt fixing.

[0015] A further preferred technical solution lies in that: the fixing plate unit further includes a stiffening plate provided on the opening plate and used for connecting the steel rod.

[0016] A further preferred technical solution lies in that: the number of the tensile combination block units in a single pipe body is 1 or 2.

[0017] A further preferred technical solution lies in that: the steel rod is provided with a welding ring for connecting the pipe body or the tensile combination block unit.

[0018] A further preferred technical solution lies in that: the tensile combination block unit includes a fixed inclined plane block provided on the inner ring surface of the pipe body, and a movable inclined plane block provided on the end surface of the steel rod and used for clamping the fixed inclined plane block.

[0019] A further preferred technical solution lies in that: the fixed inclined plane block is a right trapezoidal block, and the movable inclined plane block is a frustum-shaped block.

[0020] A further preferred technical solution lies in that: the number of the fixed inclined plane blocks is 3 - 5, and they are evenly spaced in a circumferential arrangement on the inner ring surface of the pipe body.

[0021] A further preferred technical solution lies in that: the fixing plate unit further includes a reinforcing nut provided on the expansion bolt. Description of the Drawings

[0022] Figure 1 It is a structural schematic diagram of the present utility model.

[0023] Figure 2 It is a schematic diagram of the position of the steel rod in the present utility model from a top view angle.

[0024] Figure 3 This is a schematic diagram of the position of the fixing plate unit in the present utility model.

[0025] Figure 4 This is a schematic diagram of the position of the pipe body in the present utility model.

[0026] Figure 5 This is a schematic diagram of one of the usage modes of the tensile combination block unit in the present utility model.

[0027] Figure 6 This is a schematic diagram of the structure of the fixing plate unit in the present utility model.

[0028] Figure 7 This is a schematic diagram of a combination mode of the installation groove in the present utility model.

[0029] Figure 8 This is a schematic diagram of the position of the stiffening plate in the present utility model.

[0030] Figure 9 This is a schematic diagram of the position and shape of the flared groove at the outer end of the hole in the present utility model.

[0031] Figure 10 This is a schematic diagram of the inclined section of the steel bar at the end position in the present utility model.

[0032] In the figure, the meanings of the respective marks are as follows:

[0033] Bridge web 11, panel 12, bottom plate 13;

[0034] Installation groove 1, fixing plate unit 2, steel bar 3, pipe body 4, tensile combination block unit 5, welding ring 6, glue block 7 for bolt fixing;

[0035] Perforated plate 201, expansion bolt 202, flared groove 203 at the outer end of the hole, stiffening plate 204, fixed inclined block 501, movable inclined block 502, reinforcing nut 205. Detailed implementation manners

[0036] The following is only a preferred embodiment of the present utility model, and does not limit the scope of the present utility model.

[0037] As shown in the appendix Figure 1-10 As shown, a structure for flexibly widening the new and old bridges by using a telescopic steel bar includes 2 bridge webs 11, and further includes an installation groove 1 provided on the bridge web 11, 2 fixing plate units 2 respectively provided on the two bridge webs 11 and connecting the installation groove 1, several steel bars 3 provided between the two fixing plate units 2, a pipe body 4 with two ends respectively connecting adjacent two steel bars 3, and a tensile combination block unit 5 provided in the pipe body 4 and connecting the steel bars 3.

[0038] In this embodiment, the new and old bridges can be box girders or T-shaped girders. The latter does not have the bottom plate 13, but it does not affect the opening of the installation groove 1 and the installation of the fixing plate unit 2.

[0039] Among them, the installation groove 1 does not penetrate through the bridge web 11. Its quantity, position, as well as the diameter and depth dimensions of itself are determined by the fixing plate unit 2, as long as all the fixing plate unit 2 can be stably installed.

[0040] On the other hand, two paired fixing plate units 2 and all the steel bars 3 and pipe bodies 4 therebetween together form a complete "rod-shaped connection monomer". At least 3 rows of the above-mentioned "rod-shaped connection monomers" are arranged between the new and old bridges, and more columns sufficient to cover the longitudinal range of the new and old bridges in the longitudinal direction, such as 50 - 100 columns.

[0041] In addition, the above-mentioned "rod-shaped connection monomer" refers to a telescopic steel bar, and its functions at least include:

[0042] First, appropriately transfer the vertical load between the new and old bridges, mainly enabling the new bridge to share the vehicle load on the old bridge;

[0043] Second, allow the new and old bridges to have appropriate relative displacements in the longitudinal and vertical directions;

[0044] Third, limit the relative separation of the new and old bridges in the transverse direction;

[0045] Fourth, the new and old bridges are originally relatively close to each other in the transverse direction. If a further approaching displacement occurs, the new and old bridges will abut against each other. Fundamentally, the amplitude of the approaching displacement will not be too large, and the "rod-shaped connection monomer" also has an appropriate ability to prevent approaching.

[0046] So far, all the basic functions of the flexibly widened new and old bridges have been realized. During the normal use of this structure, the telescopic steel bar can extend, retract, or bend appropriately, ensuring that the relative displacement that cannot be completely avoided between the new and old bridges will not break the telescopic steel bar and is also difficult to cause great damage to the structures of the new and old bridges themselves.

[0047] Moreover, the key point is that this flexibly widening method can fully and appropriately transfer the vertical load, thereby mainly protecting the old bridge with a lower structural strength compared to the new bridge, enabling the former to appropriately share the vehicle load on the latter.

[0048] The fixing plate unit 2 includes an opening plate 201 provided on the bridge web 11 and connecting the steel bar 3 at the connection end position, and an expansion bolt 202 inserted on the opening plate 201 and connecting the installation groove 1.

[0049] In this embodiment, the perforated plate 201 is rectangular in shape, and a circular hole is provided at each of the four end corners thereof for aligning the mounting groove 1 and mounting the expansion bolt 202.

[0050] Among them, the expansion bolt 202 is an umbrella-shaped expansion bolt, which has a greater connection strength compared to ordinary expansion bolts.

[0051] The fixing plate unit 2 further includes an outer end flaring groove 203 provided on the perforated plate 201 and used for adding and forming a glue block 7 for bolt fixing.

[0052] In this embodiment, the outer end flaring groove 203 is triangular in shape. The opening characteristics and the shape of the inclined surface are such that the addition action of the glue for bolt fixing is more accurate, and as much glue as possible enters the circular hole of the perforated plate 201, thereby fully bonding and fixing the expansion bolt 202.

[0053] The fixing plate unit 2 further includes a stiffening plate 204 provided on the perforated plate 201 and used for connecting the steel bar 3.

[0054] In this embodiment, the perforated plate 201 and the stiffening plate 204 are integrally formed, and both are welded to the steel bar 3 at the end position, ensuring that the entire telescopic steel bar has sufficient installation stability on the new and old bridges.

[0055] Among them, the number of the stiffening plates 204 is 4, which are evenly and fully connected to reinforce the above-mentioned steel bar 3.

[0056] The number of the tensile combination block units 5 in a single pipe body 4 is 1 or 2.

[0057] In this embodiment, as shown in the appendix Figure 4 The number of the tensile combination block units 5 is 1, which is arranged at one end of the pipe body 4, and the other end of the pipe body 4 is connected to the steel bar 3, ensuring the most basic and crucial tensile effect of the telescopic steel bar.

[0058] As shown in the appendix Figure 5 The number of the tensile combination block units 5 is 2, which are respectively connected to 2 steel bars 3, and also make the telescopic steel bar have a basic tensile effect and a secondary compressive effect.

[0059] So far, all the required functions of the above flexible widening method have been fully realized, including: appropriately sharing the load vertically, allowing appropriate displacement vertically and longitudinally along the bridge, mainly restricting mutual separation transversely across the bridge, and secondly restricting mutual approach transversely across the bridge.

[0060] A welding ring 6 for connecting the pipe body 4 or the tensile combination block unit 5 is provided on the steel bar 3.

[0061] In this embodiment, the position of the tensile combination block unit 5 inside the pipe body 4 is relatively outer, so that the position to be welded with the steel bar 3 is exposed, ensuring that the welding operation for a complete circle corresponding to the welding ring 6 can be carried out simply and conveniently.

[0062] The welding ring 6 between the steel bar 3 and the pipe body 4 is completely exposed, and there is no problem of difficult operation. For details, please refer to the appendix Figure 4 .

[0063] The tensile combination block unit 5 includes a fixed inclined plane block 501 provided on the inner ring surface of the pipe body 4, and a movable inclined plane block 502 provided on the end surface of the steel bar 3 and used for clamping the fixed inclined plane block 501.

[0064] In this embodiment, when the new and old bridges move away from each other in the transverse direction of the bridge, the inclined planes of the fixed inclined plane block 501 and the movable inclined plane block 502 first approach each other and then completely abut against each other, thereby restricting the new and old bridges from moving away from each other significantly in the transverse direction of the bridge.

[0065] On the other hand, when the new and old bridges move away from and close to each other slightly in the transverse direction of the bridge, the tensile combination block unit 5 allows this relative displacement action, that is, the fixed inclined plane block 501 and the movable inclined plane block 502 have not triggered the state of abutting against each other yet. This is the meaning of the above-mentioned "retractable" word.

[0066] Finally, for the entire retractable steel bar structure, although it is disconnected at the tensile combination block unit 5, within the complete vertical circle range of the retractable steel bar, it has a function of restricting bending movement, so as to: transfer the load, restrict the new and old bridges from having a large relative displacement in the vertical, longitudinal and any oblique directions. This is also the meaning of the word "flexible widening".

[0067] The fixed inclined plane block 501 is a right trapezoidal block, and the movable inclined plane block 502 is a frustum of a cone block.

[0068] In this embodiment, when the tensile effect needs to be triggered, the frustum-shaped movable inclined plane block 502 can abut against all the fixed inclined plane blocks 501 at the same time, ensuring that the above-mentioned tensile effect has the advantages of high strength and uniform stress at each part, and further avoiding the retractable steel bar from being easily broken at the pipe body 4.

[0069] The number of the fixed inclined plane blocks 501 is 3 - 5, and they are evenly spaced in a circumferential arrangement on the inner ring surface of the pipe body 4.

[0070] In this embodiment, the fixed inclined surface blocks 501 that are evenly arranged in the circumferential direction and have a sufficient and appropriate number can fully and stably resist the movable inclined surface blocks 502, making the above-mentioned tensile effect safer.

[0071] The fixing plate unit 2 further includes a reinforcing nut 205 provided on the expansion bolt 202.

[0072] In the prior art, the basic component group of the expansion bolt 202 is: a nut, a screw rod, and an expansion member. Among them, the number of the above-mentioned nuts is 1, which is used to expand the above-mentioned expansion member. The reinforcing nut 205 is used to tighten the above-mentioned nut that has been rotated in place, so that the above-mentioned nut is not easily loosened or dropped by itself.

[0073] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various modifications can be made without departing from the purpose of the present invention. These are all non-creative modifications and are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A structure for flexibly widening the old and new bridges by using telescopic steel rods, comprising two bridge webs (11), characterized in that: It also includes a mounting groove (1) arranged on the bridge web (11), two fixing plate units (2) respectively arranged on two bridge webs (11) and connected to the mounting groove (1), a plurality of steel bars (3) arranged between the two fixing plate units (2), a tube body (4) with two ends respectively connected to two adjacent steel bars (3), and a tensile assembly block unit (5) arranged in the tube body (4) and connected to the steel bars (3).

2. The structure of using telescopic steel rods to flexibly widen the new and old bridges according to claim 1 is characterized in that: The fixing plate unit (2) comprises a perforated plate (201) arranged on the bridge web (11) and connected to the steel rod (3) at the end position, and an expansion bolt (202) inserted into the perforated plate (201) and connected to the installation groove (1).

3. The structure of using telescopic steel rods to flexibly widen the new and old bridges according to claim 2 is characterized in that: The fixing plate unit (2) further comprises a hole outer end flaring groove (203) arranged on the perforated plate (201) and used for adding a glue block (7) for bolt fixing.

4. The structure of using telescopic steel rods to flexibly widen the new and old bridges according to claim 2 is characterized in that: The fixed plate unit (2) further comprises a stiffening plate (204) which is arranged on the perforated plate (201) and is used to connect the steel rod (3).

5. The structure of using telescopic steel rods to flexibly widen the new and old bridges according to claim 1 is characterized in that: The number of the tensile assembly block units (5) in a single tube body (4) is 1 or 2.

6. The structure of using telescopic steel rods to flexibly widen the new and old bridges according to claim 1 is characterized in that: The steel rod (3) is provided with a welding ring (6) for connecting the tube body (4) or the tensile assembly block unit (5).

7. The structure of using telescopic steel rods to flexibly widen the new and old bridges according to claim 1 is characterized in that: The tensile assembly block unit (5) comprises a fixed bevel block (501) arranged on the inner annular surface of the tube body (4), and a movable bevel block (502) arranged on the end surface of the steel rod (3) and used for engaging with the fixed bevel block (501).

8. The structure of using telescopic steel rods to flexibly widen the new and old bridges according to claim 7 is characterized in that: The fixed inclined plane block (501) is a right-angled trapezoidal block, and the movable inclined plane block (502) is a truncated cone-shaped block.

9. The structure of using telescopic steel rods to flexibly widen the new and old bridges according to claim 8 is characterized in that: The number of the fixed inclined plane blocks (501) is 3-5, and they are evenly spaced and arranged in a circumferential arrangement on the inner annular surface of the tube body (4).

10. The structure of using telescopic steel rods to flexibly widen the new and old bridges according to claim 2 is characterized in that: The fixing plate unit (2) further comprises a reinforcing nut (205) arranged on the expansion bolt (202).

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