Roadbed anti-fracture device for crossing movable reverse fault and application method of roadbed anti-fracture device

Abstract

The roadbed anti-fracture device comprises a supporting seat, a vertically-moving movable plate is arranged in the supporting seat, the upper end face of the movable plate is connected with the inner wall of a top plate of the supporting seat through an elastic piece, and a cavity in the lower end face of the movable plate is filled with hydraulic oil; a hydraulic oil pipe is arranged on the lower portion of the supporting seat and comprises a top pipe and a top rod, the top pipe is fixedly connected to the bottom of the supporting seat and communicates with the interior of the supporting seat, the top rod is vertically and slidably connected to the interior of the top pipe, and the cavity cross section of the supporting seat is larger than that of the top pipe; the roadbed anti-fracture device is arranged at the bottom of the roadbed of the reverse fault, the roadbed anti-fracture device can absorb most of vertical displacement to protect the roadbed from being damaged when vertical displacement is generated at the fracture position of the reverse fault due to an earthquake, and the application method provided by the invention can reasonably design and calculate the size parameters of the roadbed anti-fracture device. And the implementation effect of the roadbed anti-breaking device is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of road construction, and specifically relates to a roadbed anti-fracture device for crossing an active reverse fault and an application method thereof. Background Art

[0002] A reverse fault is a type of fault, in which the upper plate of the fault moves upward along the fault plane. Active reverse faults produce large vertical movements when an earthquake occurs, causing great damage to the roadbed in an instant. If a vehicle happens to pass by at this time, it will cause huge losses such as vehicle destruction and loss of life. However, the existing roadbed seismic measures have limited seismic effects when the fault shifts significantly, and cannot prevent damage to the roadbed when the fault shifts vertically. Summary of the invention

[0003] The purpose of the present invention is to provide a roadbed anti-fracture device and an application method for crossing an active reverse fault, so as to solve the problems raised by the above-mentioned background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a roadbed anti-fracture device that crosses an active reverse fault, comprising a support seat, the interior of the support seat is hollow, and a vertically movable plate is arranged inside the support seat, and the movable plate is sealedly connected to the inner wall of the support seat, the upper end surface of the movable plate and the inner wall of the top plate of the support seat are connected by an elastic member, and the cavity of the lower end surface of the movable plate is filled with hydraulic oil, a hydraulic oil pipe is arranged at the lower part of the support seat, the hydraulic oil pipe comprises a top pipe and a top rod, the top pipe is fixedly connected to the bottom of the support seat, and the top pipe is communicated with the interior of the support seat, the top rod is vertically slidably connected to the inside of the top pipe, and the top rod is sealedly connected to the inner wall of the top pipe, and the cavity cross-section of the support seat is larger than the cavity cross-section of the top pipe.

[0005] Furthermore, a rubber sleeve for sealing is fixedly connected to the outer side of the movable plate.

[0006] Preferably, the elastic member is a high-strength spring.

[0007] Furthermore, a fixing plate is provided at the top of the top pipe, the fixing plate is fixedly connected to the bottom of the support seat and a first sealing groove is provided on the top surface of the fixing plate, a second sealing groove is provided at the contact point between the lower part of the top pipe and the top rod, and rubber rings for sealing are provided in the first sealing groove and the second sealing groove.

[0008] An application method of a roadbed anti-fracture device crossing an active reverse fault comprises the following steps: S1: Design and calculation of roadbed anti-fracture device; first determine the maximum flexural deformation L1 of the concrete slab set at the bottom of the roadbed, and the maximum vertical displacement L2 between the upper plate and the lower plate of the reverse fault where the roadbed is located when a strong earthquake occurs. According to L1 and L2, determine the transverse cross-sectional area S of the support seat cavity, movable plate, and top pipe cavity of the roadbed anti-fracture device d , S h , S y and the spring stiffness coefficient k, so that when the vertical displacement L2 occurs between the upper plate and the lower plate of the reverse fault, the force N exerted by the roadbed anti-fracture device on the concrete slab is f When acting on the roadbed concrete slab, the flexural deformation of the concrete slab is less than L1; S2: excavate a foundation pit at the roadbed, and the excavated foundation pit crosses the potential rupture area of ​​the reverse fault, cast a concrete lower foundation on the upper plate of the reverse fault at the bottom of the foundation pit, and evenly distribute multiple roadbed anti-fracture devices on the upper plate along the fault line of the reverse fault, and the lower part of the top rod of the roadbed anti-fracture device is cast as a whole with the concrete lower foundation; S3: A concrete slab is set up above the roadbed anti-fracture device, and the concrete slab on the upper wall of the reverse fault is suspended from the foundation, and one end of the concrete slab at the lower wall of the reverse fault is set on the foundation; S4: Construct the roadbed on top of the concrete slab according to the construction requirements.

[0009] Preferably, in step S1, the support base is set to be a cuboid or a cylinder, and the cross-sectional area S of the top plate of the support base is d and the transverse cross-sectional area S of the movable plate h Equal, through the formula , and the actual engineering needs to design the cross-sectional area S of the support seat cavity d , Transverse cross-sectional area of ​​movable plate S h , the transverse cross-sectional area S of the top tube cavity y , the number of springs a and the spring stiffness coefficient k, where L t When the force exerted by the roadbed anti-breaking device on the concrete slab is N f The amount of compression of the spring.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The present invention arranges a roadbed anti-fracture device at the bottom of the roadbed of the reverse fault. When an earthquake occurs and causes vertical displacement at the reverse fault fracture, the top rod of the roadbed anti-fracture device moves upward with the upper plate of the reverse fault, and pushes the hydraulic oil in the top pipe into the cavity of the support seat. Since the cavity cross-section of the support seat is larger than the cavity cross-section of the top pipe, the upward displacement of the movable plate is smaller than the displacement of the top rod, that is, the upward displacement of the movable plate is smaller than the vertical displacement of the upper plate and the lower plate of the reverse fault, thereby protecting the roadbed from being damaged. In addition, the application method provided by the present invention can reasonably design and calculate the size parameters of the roadbed anti-fracture device to ensure the implementation effect of the roadbed anti-fracture device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the installation of a roadbed anti-fracture device for crossing an active reverse fault provided by an embodiment of the present invention; Figure 2 is a forward cross-sectional view of a roadbed anti-fracture device for crossing an active reverse fault provided by an embodiment of the present invention; In the figure, 1-support seat, 2-hydraulic oil pipe, 3-roadbed, 4-concrete slab, 5-upper plate, 6-lower plate, 7-foundation pit, 11-movable plate, 12-rubber sleeve, 13-spring, 21-jacking pipe, 22-jacking rod, 211-fixed plate, 212-first sealing groove, 213-second sealing groove. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] See also Figure 1 and Figure 2 The present invention provides a technical solution: 1. A roadbed anti-fracture device for crossing an active reverse fault, comprising a support seat 1, the support seat 1 is hollow inside, and a vertically movable movable plate 11 is arranged inside the support seat 1, and a rubber sleeve 12 for sealing is fixedly connected to the outer side of the movable plate 11, and the movable plate 11 is sealed and connected to the inner wall of the support seat 1 through the rubber sleeve 12, the upper end surface of the movable plate 11 and the inner wall of the support seat 1 are connected through a high-strength spring 13, and the cavity of the lower end surface of the movable plate 11 is filled with hydraulic oil, and a hydraulic oil pipe 2 is arranged at the lower part of the support seat 1, and the hydraulic oil pipe 2 includes a top pipe 21 and a top rod 22, the top pipe 21 is fixedly connected to the bottom of the support seat 1, and the top pipe 21 is communicated with the inside of the support seat 1, the top rod 22 is vertically slidably connected inside the top pipe 21, and the top rod 22 is sealed and connected to the inner wall of the top pipe 21.

[0014] In order to avoid oil leakage from the hydraulic oil pipe, reduce the pressure at the connection between the hydraulic oil pipe 2 and the bottom of the support seat 1, and increase the supporting performance of the hydraulic oil pipe 2, a fixed plate 211 is arranged on the top of the top pipe 21, the fixed plate 211 is fixedly connected to the bottom of the support seat 1 and a first sealing groove 212 is arranged on the top surface of the fixed plate 211, and a second sealing groove 213 is arranged at the contact point between the lower part of the top pipe 21 and the top rod 22, and rubber rings for sealing are arranged in the first sealing groove 212 and the second sealing groove 213.

[0015] In the specific implementation process, when it is necessary to build a roadbed at the reverse fault, the construction steps are as follows: S1: Design and calculation of roadbed anti-fracture device; first determine the maximum flexural deformation L1 of the concrete slab 4 set at the bottom of the roadbed 3, and the maximum vertical displacement L2 between the upper plate 5 and the lower plate 6 of the reverse fault where the roadbed 3 is located when a strong earthquake occurs. According to L1 and L2, the transverse cross-sectional area S of the cavity of the support seat 1, the movable plate 11, and the cavity of the top pipe 21 of the roadbed anti-fracture device is determined. d , S h , S y and the stiffness coefficient k of the spring 13, so that when a vertical displacement L2 occurs between the upper plate 5 and the lower plate 6 of the reverse fault, the force N exerted by the roadbed anti-fracture device on the concrete slab 4 is f When acting on the concrete slab 4, the flexural deformation of the concrete slab 4 is less than L1. Taking the rectangular or cylindrical support seat 1 as an example, the transverse cross-sectional area S of the cavity of the support seat 1 is d and the transverse cross-sectional area S of the movable plate 11 h Equal, through formula (1): (1), and the actual engineering needs to design the cross-sectional area S of the support seat 1 cavity d , the transverse cross-sectional area S of the movable plate 11 h , the transverse cross-sectional area S of the cavity of the top pipe 21 y , the number a of spring 13 and the stiffness coefficient a of spring 13, where L t When the force exerted by the roadbed anti-breaking device on the concrete slab 4 is N f The height of the support seat 1 must be designed to ensure that the movable plate 11 in the support seat 1 can be moved greater than the displacement L t When designing the height of the top pipe 21 and the top rod 22, it is necessary to ensure that the movable displacement of the top rod 22 in the top pipe 21 is greater than L2. The size design of the support seat 1, the top rod 22, and the top pipe 21 needs to ensure their structural strength. When the strength requirements are met, the equation relationship of formula (1) can be met. The structural strength design belongs to the prior art and will not be described in detail here. S2: excavating a foundation pit 7 at the roadbed 3, and the excavated foundation pit 7 crosses the potential rupture area of ​​the reverse fault, pouring a concrete lower foundation at the upper plate 5 of the reverse fault at the bottom of the foundation pit 7, and setting a roadbed anti-fracture device at the upper plate 5 every 6-8m along the fracture line direction of the reverse fault, and the lower part of the top rod 22 of the roadbed anti-fracture device is poured as a whole with the concrete lower foundation; S3: A concrete slab 4 is set up above the roadbed anti-fracture device, and the concrete slab 4 on one side of the upper plate 5 of the reverse fault is suspended from the foundation, and one end of the concrete slab 4 at the lower plate 6 of the reverse fault is set up on the foundation; S4: constructing a roadbed 3 on the concrete slab 4 according to construction requirements; Example 1: When constructing a highway, it is experimentally determined that the maximum flexural deformation of the concrete slab 4 used in the construction is L1 = 2 mm. When an anti-fracture device is set every 6 m along the reverse fault, the force N required to be applied when the concrete slab 4 produces the maximum flexural deformation L1 is f = 100KN. Through geological exploration, it is determined that the maximum vertical displacement between the upper plate 5 and the lower plate 6 of the reverse fault is L2 = 5m; When designing the roadbed anti-breaking device, the support seat 1 is designed to be a rectangular parallelepiped, and the cross-sectional area of ​​the cavity of the support seat 1 is S d =1m 2 and the transverse cross-sectional area S of the movable plate 11 h =1m 2 , 4 springs 13 are evenly distributed on the movable plate 11, and the formula is: , take the spring constant of spring 13 as k=500KN / m, and calculate L t =5cm, the transverse cross-sectional area S of the top pipe 21 cavity y =0.01m 2 The size of the top rod 22 can be designed to match the top pipe 21, and the remaining parameters can be set according to the required structural strength. The construction parameters of the roadbed anti-breaking device are shown in Table 1:

[0016] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A roadbed anti-fracture device for crossing an active reverse fault, characterized in that: It includes a support seat, which is hollow inside and is provided with a movable plate that moves vertically inside the support seat, and the movable plate is sealed and connected to the inner wall of the support seat, the upper end surface of the movable plate and the inner wall of the top plate of the support seat are connected by an elastic member, and the cavity of the lower end surface of the movable plate is filled with hydraulic oil, a hydraulic oil pipe is provided at the lower part of the support seat, the hydraulic oil pipe includes a top pipe and a top rod, the top pipe is fixedly connected to the bottom of the support seat, and the top pipe is communicated with the inside of the support seat, the top rod is vertically slidably connected to the inside of the top pipe, and the top rod is sealed and connected to the inner wall of the top pipe, and the cavity cross-section of the support seat is larger than the cavity cross-section of the top pipe.

2. The roadbed anti-fracture device for crossing an active reverse fault according to claim 1, characterized in that: A rubber sleeve for sealing is fixedly connected to the outer side of the movable plate.

3. The roadbed anti-fracture device for crossing an active reverse fault according to claim 1, characterized in that: The elastic member is a high-strength spring.

4. The roadbed anti-fracture device for crossing an active reverse fault according to claim 1, characterized in that: A fixing plate is arranged at the top of the top pipe, the fixing plate is fixedly connected to the bottom of the support seat and a first sealing groove is arranged on the top surface of the fixing plate, a second sealing groove is arranged at the contact point between the lower part of the top pipe and the top rod, and rubber rings for sealing are arranged in the first sealing groove and the second sealing groove.

5. An application method of the roadbed anti-fracture device crossing an active reverse fault as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: S1: Design and calculation of roadbed anti-fracture device; first determine the maximum flexural deformation L1 of the concrete slab set at the bottom of the roadbed, and the maximum vertical displacement L2 between the upper plate and the lower plate of the reverse fault where the roadbed is located when a strong earthquake occurs. According to L1 and L2, determine the transverse cross-sectional area S of the support seat cavity, movable plate, and top pipe cavity of the roadbed anti-fracture device d , S h , S y and the spring stiffness coefficient k, so that when the vertical displacement L2 occurs between the upper plate and the lower plate of the reverse fault, the force N exerted by the roadbed anti-fracture device on the concrete slab is f When acting on the roadbed concrete slab, the flexural deformation of the concrete slab is less than L1; S2: excavate a foundation pit at the roadbed, and the excavated foundation pit crosses the potential rupture area of ​​the reverse fault, cast a concrete lower foundation on the upper plate of the reverse fault at the bottom of the foundation pit, and evenly distribute multiple roadbed anti-fracture devices on the upper plate along the fault line of the reverse fault, and the lower part of the top rod of the roadbed anti-fracture device is cast as a whole with the concrete lower foundation; S3: A concrete slab is set up above the roadbed anti-fracture device, and the concrete slab on the upper wall of the reverse fault is suspended from the foundation, and one end of the concrete slab at the lower wall of the reverse fault is set on the foundation; S4: Construct the roadbed on top of the concrete slab according to the construction requirements.

6. The application method of the roadbed anti-fracture device for crossing an active reverse fault according to claim 5 is characterized in that: In step S1, the support base is set to be a cuboid or a cylinder. At this time, the cross-sectional area S of the support base cavity is d and the transverse cross-sectional area S of the movable plate h Equal, through the formula , and the actual engineering needs to design the cross-sectional area S of the support seat cavity d , Transverse cross-sectional area of ​​movable plate S h , the transverse cross-sectional area S of the top tube cavity y , the number of springs a and the spring stiffness coefficient k, where L t When the force exerted by the roadbed anti-breaking device on the concrete slab is N f The amount of compression of the spring.

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