A device for preventing vehicle jumping at bridge head and construction method thereof

Abstract

The present invention discloses a device for preventing bridge head jumping, comprising a plurality of hollow structural plates installed on the bridge head, a plurality of pipe piles being supported and installed at the lower ends of the plurality of hollow structural plates, a strain sensor being installed on the hollow structural plate, the strain sensor being connected to a stress monitoring device, and a prestressed component being installed on the hollow structural plate; the present invention designs a device for preventing bridge head jumping, timely monitors the deformation of the hollow structural plate through the stress monitoring device, and when the set value is reached, the prestressed component is tensioned, and the prestressed component acts on the hollow structural plate to restore the original shape of the hollow structural plate, and then local grouting is performed on the gap of the hollow structural plate with large stress deformation; in this way, a device for preventing bridge head jumping that integrates monitoring and processing can be realized, the device has an ingenious structure and a simple construction process, and can greatly improve the existing bridge head jumping prevention technology.

Description

Technical Field

[0001] The present invention relates to the technical field of road and bridge engineering construction, and in particular to a device for preventing vehicle jumping at a bridge head and a construction method thereof. Background Art

[0002] At the transition section between a road and bridge, the difference in rigidity between the embankment and abutment structures can cause uneven settlement, leading to road dents and potholes. When high-speed vehicles pass through the transition section, they are impacted, jolted, and even severely jolted. Jolting at the bridge head has numerous adverse effects. Firstly, the bridge and other structures generate additional impact loads, accelerating the damage of components such as abutments and bearings, and increasing bridge maintenance and repair costs. Secondly, the sudden and severe jolting of vehicles can seriously affect the driver's control and potentially cause traffic accidents. Furthermore, vehicles are forced to slow down during the transition section to mitigate the jolting, which causes wear and tear on vehicle components, increases fuel consumption and exhaust emissions, and is detrimental to atmospheric environmental protection. Therefore, whether in terms of road and bridge operating costs, driving safety and comfort, or urban air pollution control, jolting at the bridge head seriously undermines the economic and social benefits of urban and highway construction.

[0003] At present, the basic ideas for preventing and controlling vehicle jumping at bridge heads focus on three aspects: strengthening the foundation to reduce foundation settlement, reducing roadbed deformation, and setting up bridge head slabs in transition sections. On this basis, corresponding measures are taken, such as strengthening the foundation, using lightweight materials to fill the roadbed, improving the compaction of the roadbed fill, reinforcing, using pile foundations, setting up bridge head slabs, etc. However, most measures must be carried out in the early stages of pavement construction. Once damaged, it is difficult to repair, which greatly increases maintenance costs. Summary of the Invention

[0004] This invention aims to address the problem of vehicle bounce at bridgeheads. It proposes a device to prevent vehicle bounce at bridgeheads. Once roadbed settlement exceeds a specified limit, timely action can be taken. This device, with its ingenious structure and simple construction process, significantly improves existing technologies for preventing vehicle bounce at bridgeheads.

[0005] The technical solutions adopted to achieve the above objectives are:

[0006] A device for preventing vehicle jumping at a bridge head includes multiple hollow structural plates installed at the bridge head, multiple supports are installed at the lower ends of the multiple hollow structural plates, strain sensors are installed on the hollow structural plates, the strain sensors are connected to a stress monitoring device, and prestressed components are installed on the hollow structural plates.

[0007] Furthermore, a plurality of hollow holes are provided on the hollow structural plate along the length direction of the bridge head, and the hollow holes include two inclined holes for docking, and the docking point of the two inclined holes is located in the middle of the span of the hollow structural plate, and the inclined holes are arranged upwardly away from the docking point; a sleeve grouting assembly is provided at the mating installation point of the hollow structural plate and the pipe pile.

[0008] Furthermore, the prestressed component is installed in the hollow hole, and the prestressed component includes an anchor end installed at the junction of the two inclined holes and two precision-rolled threaded steel bars installed at the anchor end. The other ends of the two precision-rolled threaded steel bars are respectively stretched obliquely in opposite directions out of the hollow hole of the hollow structural plate, and are installed on the hollow structural plate through the anchor plate, spiral reinforcement and anchor nut.

[0009] Furthermore, the stress monitoring device includes an embedded sensor that is in signal communication with the strain sensor, a wireless transmitter, and supporting software for mobile phone reception.

[0010] Furthermore, the sleeve grouting assembly includes a sleeve pre-embedded with the hollow structural plate and a grouting pipe installed on the sleeve. The inside of the sleeve is connected to the inside of the grouting pipe. An overflow pipe is provided at the upper end of the sleeve, and a protective cover is detachably installed on the overflow pipe. A catheter is inserted in the grouting pipe; and the steel bars of the pipe pile are inserted upward into the sleeve.

[0011] Furthermore, two hollow structural panels are installed.

[0012] Furthermore, the hollow structural panels and pipe piles are all prefabricated components.

[0013] Furthermore, the hollow structural slab adopts high ductility cement-based composite material.

[0014] A construction method based on a device for preventing vehicle jumping at a bridge head includes the following steps:

[0015] (1) Select the corresponding standard hollow structural slab according to the address conditions and highway design grade;

[0016] (2) According to the thickness of the hollow structural slab, adjust the design elevation of the cushion layer and the design elevation of the area with a compaction degree of 96% to ensure that the design elevation of the pavement remains unchanged;

[0017] (3) After the soil layer construction in the area with a compaction degree of 96% is completed, the coordinates of the prefabricated pipe piles are set out and the prefabricated pipe piles are constructed. The control elevation of the pile top is the cushion layer design elevation + the thickness of the hollow structure slab + 0.1m;

[0018] (4) Install the hollow structural plate, perform grouting on the sleeve grouting assembly, and connect the pipe piles and the hollow structural plate into one; construct the roadbed and pavement structure layer;

[0019] (5) Zero the sensor, load it according to the design load of the road surface, collect the sensor force data, remove the load, collect the residual data, determine the force fluctuation range, and convert the sinking value △h;

[0020] (6) Real-time monitoring begins. If the stress extreme value exceeds the limit or the fluctuation range becomes smaller, an early warning is initiated and the prestressed components are tensioned. The prestressed components act on the hollow structural plate to restore it to its original state before deformation. A gap is created between the hollow structural plate and the area with a compaction degree of 96%. Local grouting is performed in the gap area where the stress and deformation of the hollow structural plate are larger.

[0021] (7) Real-time monitoring, repeating step (6).

[0022] Furthermore, in step 6, the prestressed components respectively stretch the fine-rolled threaded steel bars through the jacks, and the fine-rolled threaded steel bars push the hollow structural plate upward to reduce deformation.

[0023] The beneficial effects of the present invention are:

[0024] The present invention designs a device for preventing bridge head vehicle jumping, and timely monitors the deformation of the hollow structure plate through a stress monitoring device. When the set value is reached, the prestressed component is tensioned, and the prestressed component acts on the hollow structure plate to restore the hollow structure plate to its original shape, and then local grouting is performed on the gaps in the hollow structure plate with large stress deformation; in this way, a device for preventing bridge head vehicle jumping that integrates monitoring and processing can be realized. The device has an ingenious structure and a simple construction process, and can greatly improve the existing bridge head vehicle jumping prevention technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram for use in the present invention;

[0026] Figure 2 is a schematic diagram of the sleeve grouting assembly of the present invention;

[0027] Figure 3 This is a schematic diagram of the installation of the prestressed assembly of the present invention;

[0028] Figure 4 It is a top view of the prestressed component of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] like Figure 1-4As shown, a device for preventing vehicle jumping at a bridge head comprises a plurality of hollow structural plates 1 installed at the bridge head, wherein the hollow structural plates 1 are installed above an area 2 with a compaction degree of 96%. Preferably, two hollow structural plates 1 are installed. The deformation of the hollow structural plate 1 facing the abutment is twice that of the second plate; a plurality of pipe piles 3 are supported and installed at the lower ends of the plurality of hollow structural plates 1, preferably, the pipe piles 3 have a diameter of 80 cm, and the pile length is determined according to geological conditions; the pile tops of the pipe piles 3 are connected to the hollow structural plate 1 through a sleeve grouting assembly 6, and the sleeve grouting assembly 6 is prefabricated on the hollow structural plate 1 in advance and becomes a part of the hollow structural plate 1, a strain sensor is installed on the hollow structural plate 1, preferably, the strain sensor is embedded in the steel bar of the hollow structural plate 1; the strain sensor is connected to a stress monitoring device 5, and a prestressed assembly 7 is installed on the hollow structural plate 1. The deformation of the hollow structural plate 1 is monitored in time by the stress monitoring device 5. When the set value is reached, the prestressing component 7 is tensioned. The prestressing component 7 acts on the hollow structural plate 1, so that the deformation of the hollow structural plate 1 is reduced or restored to its original shape. Then, local grouting is performed on the gaps in the hollow structural plate 1 where the stress and deformation are large.

[0031] like Figure 1-4 As shown, in this embodiment, the hollow structural plate 1 is provided with a plurality of hollow holes 11 extending along the length of the bridge head. The hollow holes 11 include two butted oblique holes. The butt joint of the two oblique holes is located at the mid-span of the hollow structural plate 1, and the oblique holes are arranged upwardly and away from the butt joint. Preferably, the diameter of the two oblique holes is not less than 5 cm.

[0032] like Figure 1-4 As shown, in order to exert an effect on the deformed hollow structural plate 1 so that the deformation of the hollow structural plate 1 is restored to its original shape, in this embodiment, a prestressed component 7 is used to act on the hollow structural plate 1, and the prestressed component 7 is installed in the hollow hole 11. The prestressed component 7 includes an anchor end 72 installed at the junction of the two inclined holes and two finished rolled threaded steel bars 71 installed at the anchor end 72. Preferably, the finished rolled threaded steel bars are coated with anti-rust paint on the outside; the other ends of the two finished rolled threaded steel bars 71 are respectively stretched obliquely in opposite directions out of the hollow hole 11 of the hollow structural plate 1, and are installed on the hollow structural plate 1 through the anchor plate 73, the spiral rib 74 and the anchor nut 75. When the hollow structure plate 1 is deformed during use, a gap is generated between the hollow structure plate 1 and the area 2 with a compaction degree of 96%. By tensioning the fine-rolled threaded steel bars 71, the fine-rolled threaded steel bars 71 act upward on the hollow structure plate 1, causing the deformation of the hollow structure plate 1 to return to its original shape. Then, local grouting is performed on the gap area with large stress deformation of the hollow structure plate 1 to ensure the foundation is dense and avoid roadbed settlement.

[0033] like Figure 1-4As shown, in order to timely monitor the deformation of the hollow structural plate 1, in this embodiment, the stress monitoring device 5 includes an embedded sensor that communicates with the strain sensor for signal communication, a wireless transmitter, and a mobile phone receiving supporting software. The stress monitoring device 5 is installed in a stress monitoring device 5 box. The stress monitoring device 5 box is made of galvanized aluminum alloy material and is fixed above the end of the hollow structural plate 1 by bolts; the stress monitoring device 5 box has various sizes and can be adjusted according to the size and function of the stress detector. The strain sensor wire on the steel bar of the hollow structural plate 1 is led out from the end and connected to the device in the stress monitoring device 5 box. The staff can use the mobile phone to check the deformation of the hollow structural plate 1 in time, and act on the prestressing component 7 in time to reduce the deformation of the hollow structural plate 1, avoid roadbed settlement, and prevent the problem of vehicle jumping at the bridge head.

[0034] like Figure 1-4 As shown, in order to realize the connection between the pipe pile 3 and the hollow structural plate 1, the sleeve grouting assembly 6 includes a sleeve 63 pre-buried and installed with the hollow structural plate 1 and a grouting pipe 61 installed on the sleeve 63. The sleeve 63 is connected to the grouting pipe 61. The upper end of the sleeve 63 is provided with a grouting pipe 62, and a protective cover is detachably installed on the grouting pipe 62; a guide tube is inserted into the grouting pipe 61; and the steel bars of the pipe pile 3 are upwardly inserted into the sleeve 63. Preferably, the grouting pipe 62 is connected to the protective cover by a thread. During processing, the hollow structural plate 1 is pre-buried and installed with the sleeve 63, and the top of the pipe pile 3 extends upward with a steel bar connected to the sleeve 63. In this embodiment, eight steel bars extend upward from the top of each pipe pile 3. Grouting through the grouting pipe 61 can realize the connection between the pipe pile 3 and the hollow structural plate 1 as a whole.

[0035] In order to facilitate installation and speed up the construction period, in this embodiment, the hollow structural plate 1 and the pipe piles 3 are all prefabricated components.

[0036] Preferably, the hollow structural panel 1 is made of high-ductility cement-based composite material.

[0037] A construction method based on a device for preventing vehicle jumping at a bridge head includes the following steps:

[0038] (1) According to the address conditions and highway design grade, select the corresponding standard hollow structural slab1.

[0039] (2) According to the thickness of the hollow structural slab 1, adjust the design elevation of the cushion layer and the design elevation of area 2 with a compaction degree of 96% to ensure that the design elevation of the pavement remains unchanged.

[0040] (3) After the construction of the soil layer in area 2 with a compaction degree of 96% is completed, the coordinates of prefabricated pipe pile 3 are marked and prefabricated pipe pile 3 is constructed. The control elevation of the pile top of pipe pile 3 is the design elevation of the cushion layer + the thickness of the hollow structure slab + 0.1m.

[0041] (4) Install the hollow structural plate 1, perform grouting on the sleeve grouting assembly 6, and connect the pipe pile 3 and the hollow structural plate 1 into one; construct the roadbed and pavement structure layer 4;

[0042] (5) Zero the sensor, load it according to the design load of the road surface, collect the sensor force data, remove the load, collect the residual data, determine the force fluctuation range, and convert the sinking value △h;

[0043] (6) Real-time monitoring begins. If the extreme force exceeds the limit or the fluctuation range becomes smaller, an early warning is initiated and the prestressed component 7 is tensioned. The angle θ between the external prestress and the bottom plate is θ, and the tensioning force T=2a·△h·sinθ·cosθE·A / L, where a is the adjustment coefficient. The prestressed component 7 acts on the hollow structure plate 1 to restore it to its original state before deformation. A gap is generated between the hollow structure and the area 2 with a compaction degree of 96%. Local grouting is performed in the gap area where the stress and deformation of the hollow structure plate 1 are larger. Ensure that the foundation is dense and avoid roadbed settlement.

[0044] (7) Real-time monitoring, repeating step (6).

[0045] In order to indirectly make the prestressed component 7 act on the hollow structural plate 1 by acting on the prestressed component 7, so that the hollow structural plate 1 recovers its deformation to the state before deformation, the prestressed component 7 in step 6 is stretched and acted on the fine-rolled threaded steel bars 71 by the jack, and the fine-rolled threaded steel bars 71 push the hollow structural plate 1 upward to recover its deformation to the state before deformation; preferably, the jack is of YC-70 type, and the tensioning of the fine-rolled threaded steel bars 71 is mainly controlled by the deformation of the hollow structural plate 1. The specifications of the fine-rolled threaded steel bars 71 can be selected from JL25, JL28, and JL32.

[0046] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of protection of the technical solution of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to 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 limiting the protection content of the present invention.

[0048] If words such as "first" and "second" are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only to facilitate the description of the present invention and simplify the description. Unless otherwise stated, the above words have no special meaning.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A device for preventing vehicle jumping at a bridge head, characterized in that: It includes a plurality of hollow structural plates installed on the bridge head, a plurality of pipe piles are supported and installed at the lower ends of the plurality of hollow structural plates, a strain sensor is installed on the hollow structural plate, the strain sensor is connected to a stress monitoring device, and a prestressed component is installed on the hollow structural plate; The hollow structure plate is provided with a plurality of hollow holes along the length direction of the bridge head, the hollow holes include two butted oblique holes, the butt joint of the two oblique holes is located in the middle of the span of the hollow structure plate, and the oblique holes are arranged upwardly away from the butt joint; a sleeve grouting assembly is provided at the matching installation place of the hollow structure plate and the pipe pile; The sleeve grouting assembly comprises a sleeve pre-buried and installed with the hollow structural plate and a grouting pipe installed on the sleeve, the sleeve is connected with the grouting pipe, the upper end of the sleeve is provided with an overflow pipe, and a protective cover is detachably installed on the overflow pipe; a guide tube is inserted in the grouting pipe; the steel bars of the pipe pile are inserted upward into the sleeve; The prestressed component is installed in the hollow hole, and the prestressed component includes an anchor end installed at the joint of the two inclined holes and two precision-rolled threaded steel bars installed at the anchor end, and the other ends of the two precision-rolled threaded steel bars are respectively stretched out of the hollow holes of the hollow structural plate in opposite directions and installed on the hollow structural plate through the anchor plate, spiral bars and anchor nuts; The stress monitoring device includes an embedded sensor in signal communication with the strain sensor, a wireless transmitter and a mobile phone receiving supporting software; The strain sensor is embedded in the steel bar of the hollow structural plate, and the deformation of the hollow structural plate is monitored in time by the stress monitoring device. When the set value is reached, the prestressed component is tensioned, and the prestressed component acts on the hollow structural plate to reduce the deformation of the hollow structural plate or restore the original shape, and then local grouting is performed on the gap with large stress deformation of the hollow structural plate.

2. A device for preventing vehicle jumping at a bridge head according to claim 1, characterized in that: Two hollow structural panels are installed.

3. A device for preventing vehicle jumping at a bridge head according to claim 2, characterized in that: The hollow structural panels and pipe piles are all prefabricated components.

4. A device for preventing vehicle jumping at a bridge head according to claim 3, characterized in that: The hollow structural slab adopts high ductility cement-based composite material.

5. A construction method for preventing a vehicle from jumping over a bridge head according to any one of claims 1 to 4, characterized in that: The steps include: (1) Select hollow structural slabs of corresponding standards according to the site conditions and highway design grade; (2) According to the thickness of the hollow structure slab, adjust the design elevation of the cushion layer and the design elevation of the area with a compaction degree of 96% to ensure that the design elevation of the pavement remains unchanged; (3) After the soil layer construction in the area with a compaction degree of 96% is completed, the coordinates of the prefabricated pipe piles are set out and the prefabricated pipe piles are constructed. The control elevation of the pile top is the cushion layer design elevation + the thickness of the hollow structure slab + 0.1m; (4) Install the hollow structural slab, perform grouting construction on the sleeve grouting assembly, and connect the pipe pile and the hollow structural slab as one; construct the roadbed and pavement structure layer; (5) Zero the sensor, load it according to the design load of the road surface, collect the force data of the sensor, remove the load, collect the residual data, determine the force fluctuation range, and convert the sinking value △h; (6) Real-time monitoring begins. If the stress extreme value exceeds the limit or the fluctuation range becomes smaller, an early warning is initiated and the prestressed components are tensioned. The prestressed components act on the hollow structure plate to restore it to the state before deformation. A gap is created between the hollow structure plate and the area with a compaction degree of 96%. Local grouting is performed in the gap area where the stress and deformation of the hollow structure plate are larger. (7) Real-time monitoring, repeating step (6).

6. A construction method according to claim 5, characterized in that: In step (6), the prestressed components are stretched by jacks to respectively apply a stretching action to the fine-rolled threaded steel bars, and the fine-rolled threaded steel bars push the hollow structural plate upward to reduce deformation.

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