Automatic bent beam resetting device and bent beam resetting method

Abstract

The invention provides a camber beam automatic resetting device and a camber beam resetting method. The camber beam automatic resetting device comprises a lower steel plate, an upper steel plate, a supporting seat arranged between the upper steel plate and the lower steel plate, a displacement sensor arranged on an outer side baffle of the lower steel plate and a pushing mechanism arranged on the outer side of the upper steel plate. The lower steel plate comprises a lower steel plate body, lower bolts arranged below the lower steel plate body, outer side baffles arranged above the lower steel plate body and inner side baffles arranged between the outer side baffles and is used for being fixed to the pier column. The upper steel plate comprises an upper steel plate main body, an upper bolt arranged above the upper steel plate main body and a support arranged below the upper steel plate main body, the support of the upper steel plate is arranged between the outer side baffle and the inner side baffle of the lower steel plate, and the bottom surface of the upper steel plate main body is an inclined surface and is used for supporting the camber beam; and when the displacement sensor detects that the bent beam exceeds the limit, the numerical control pushing device is started, so that the bent beam recovers the normal deformation quantity. When the camber beam deforms transversely and obliquely, the camber beam is restored in time.

Description

Technical Field

[0001] The present invention relates to a bridge resetting device, in particular to a bent beam automatic resetting device and a bent beam resetting method. Background Art

[0002] Curved beams are exposed to the elements and must withstand not only the loads of various motor vehicles but also the effects of the natural environment, such as wind and rain. Over time, curved beams will move outward (creep). Some curved beams will move outward by 6-7cm in 1-2 years, 4-5cm at both ends, and 10-12cm in the middle. The outward movement of curved beams is extremely dangerous, and when the danger occurs is a random event. Generally speaking, there are many factors that affect the outward movement of curved beams, the most important of which are temperature and heavy vehicles. Curved beams have an irregular shape (not square or rectangular). Under the influence of temperature, curved beams deform irregularly. Coupled with internal prestress, the deformation is very complex. When the temperature rises, the curved beam expands, and the outer deformation is greater than the inner deformation (mainly diagonal deformation). At this time, the deformation is not a single deformation, and regardless of whether traditional one-way / two-way bearings are used, the requirements will not be met. Traditional one-way / two-way bearings will be squeezed and damaged (cannot meet the diagonal deformation). Since most bridges use prestressing, the bridge shrinkage deformation is very small when the temperature drops (not considered).

[0003] At present, most of the curved bridges have moved outwards, and replacing the damaged bridge bearings and moving the bridges are the main measures, but the cost is very high. In some places, the bridges have moved outwards by 10-12cm and have not been repaired. The movement of curved bridges is an urgent issue that needs to be addressed. Summary of the Invention

[0004] One of the purposes of the present invention is to provide an automatic resetting device for a bent beam, so as to establish a device that effectively solves the problem of outward movement of the bent beam.

[0005] A second object of the present invention is to provide a method for resetting a bent beam to solve the problem of the bent beam creeping outward.

[0006] One of the purposes of the present invention is achieved in that:

[0007] A bending beam automatic resetting device, comprising:

[0008] The lower steel plate comprises a lower steel plate body, lower bolts arranged below the lower steel plate body, outer baffles arranged above the lower steel plate body, and inner baffles arranged between the outer baffles; the lower steel plate is used to be fixed on the pier column;

[0009] The upper steel plate includes an upper steel plate body, an upper bolt arranged above the upper steel plate body, and a support arranged below the upper steel plate body. The support of the upper steel plate is between the outer baffle and the inner baffle of the lower steel plate. The bottom surface of the upper steel plate body is an inclined surface. The upper steel plate is used to support the curved beam.

[0010] A support seat, the left and right ends of which are arranged between the inner baffles of the lower steel plate, and the upper and lower ends of which are arranged between the upper steel plate body and the lower steel plate body, and the upper surface of which is an inclined surface; the support seat is used to assist the bending beam in resetting;

[0011] A displacement sensor, provided on the outer baffle of the lower steel plate, for detecting the displacement of the upper steel plate; and

[0012] The pushing mechanism is arranged on the outer side of the upper steel plate and is used to start working when the displacement of the bent beam exceeds the limit to push the upper steel plate to restore the bent beam to its original position.

[0013] Furthermore, the support seat includes a rubber pad, an intermediate steel plate, a ball slide plate and a fixed steel plate arranged in sequence from bottom to top; the upper surface of the rubber pad is an inclined surface, and the fixed steel plate is fixedly arranged on the lower surface of the upper steel plate.

[0014] Furthermore, the upper surface of the rubber pad and the bottom surface of the upper steel plate body have the same inclination angle, and the inclination angle is greater than the super-elevation angle of the curved beam by 10°.

[0015] Furthermore, the pushing mechanism includes a column, a fixing hoop, a fixer and a CNC pusher; the column is fixed to the outside of the pier through the fixing hoop, the fixer is fixed to the top of the column, and the fixer is flush with the upper steel plate body; the CNC pusher is fixed to the column through the fixer, and the thrust direction of the CNC pusher is toward the upper steel plate body.

[0016] Furthermore, the distance between the displacement sensor and the support of the upper steel plate is the same as the distance between the CNC pusher and the upper steel plate body.

[0017] The second object of the present invention is achieved in this way:

[0018] A method for resetting a bent beam comprises the following steps:

[0019] S1. The present invention provides an automatic resetting device for the bent beam;

[0020] S2. The upper surface of the upper plate and the upper surface of the support seat are located at the higher end of the outer side of the curved beam and the lower end of the curved beam; there are several sensors provided on the baffle of the lower steel plate in the outer direction of the curved beam;

[0021] S3. Anchor the upper bolts of the upper steel plate to the bottom of the curved beam and the lower bolts of the lower steel plate to the top of the pier. Secure the columns to the outside of the pier using fixing hoops.

[0022] S4. The displacement sensor measures the distance between the displacement sensor and the upper steel plate. When the displacement sensor detects that the bending beam is larger than the normal deformation, the CNC pusher starts working; when the displacement sensor detects that the bending beam is equal to the normal deformation, the CNC pusher stops working.

[0023] The curved beam is the turning section of a bridge and is prone to outward movement after prolonged use. This invention installs an automatic reset device between the curved beam and the pier, tilts the rubber pad, and increases the difficulty of outward movement. A push mechanism is then installed on the outside of the curved beam to promptly reset the curved beam if it moves outward. A ball bearing slide is installed on the rubber pad, and steel plates are placed above and below the ball bearing slide to facilitate the reset of the curved beam. This is more convenient and less costly than directly moving the bridge horizontally. This invention also installs several sensors on the outside of the curved beam, distributed in different directions. When the curved beam undergoes lateral or oblique deformation, the CNC pusher can promptly push the curved beam back to its normal deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the elevation view of the automatic resetting device for bent beams.

[0025] Figure 2 This is a top view of the automatic resetting device for the bent beam.

[0026] Figure 3 This is the structural diagram of the ball skateboard. Figure 3 (a) is a schematic diagram of the position of the ball slide and the ball. Figure 3 (b) is a top view of the ball bearing slide.

[0027] In the figure: 1. Upper bolt; 2. Upper steel plate body; 3. Support; 4. Lower steel plate body; 5. Lower bolt; 6. Outer baffle; 7. Inner baffle; 8. Fixer; 9. Rubber pad; 10. Middle steel plate; 11. Ball slide; 12. Fixed steel plate; 13. Pier; 14. Fixing hoop; 15. Column; 16. Connector between column and fixing hoop; 17. Displacement sensor; 18. CNC jack; 19. Cavity; 20. Ball. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] like Figure 1 As shown, an automatic resetting device for a bent beam of the present invention includes an upper steel plate, a support seat and a lower steel plate arranged in sequence from top to bottom, a displacement sensor arranged on the outer baffle of the lower steel plate and a pushing mechanism arranged on the outer side of the upper steel plate.

[0030] The upper steel plate includes an upper steel plate body 2, an upper bolt 1, and a support 3. The upper bolt 1 is arranged above the upper steel plate body 2, and the support 3 is arranged below the upper steel plate body 2. The bottom surface of the upper steel plate body 2 is an inclined surface. The lower steel plate includes a lower steel plate body 4, a lower bolt 5, an outer baffle 6, and an inner baffle 7. The lower bolt 5 is arranged below the lower steel plate body 4, the outer baffle 6 is arranged above the lower steel plate body 4, and the inner baffle 7 is arranged between the outer baffles 6. The support seat includes a rubber pad 9, an intermediate steel plate 10, a ball slide 11, and a fixed steel plate 12, which are arranged in sequence from bottom to top. The upper surface of the rubber pad 9 is an inclined surface with the same inclination direction as the bottom surface of the upper steel plate body 2. The intermediate steel plate 10 is arranged above the rubber pad 9. The ball slide 11 is arranged between the intermediate steel plate 10 and the fixed steel plate 12. The fixed steel plate 10 is fixed to the lower surface of the upper steel plate body 2.

[0031] The rubber pad 9 is clamped between the inner baffles 7. The inclination angles of the upper surface of the rubber pad and the bottom surface of the upper steel plate body are both greater than the superelevation angle of the curved beam by 10°.

[0032] like Figure 2 As shown, the jacking mechanism includes a column 15, a fixing hoop 14, a fixture 8, and a CNC jacking device 18. The column 15 is secured to the outside of the pier 13 via the fixing hoop 14 and the column-to-fixing hoop connector 16. The CNC jacking device 18 is secured to the top of the column 15 via the fixture 8. The CNC jacking device 18 is flush with the upper steel plate body 2, and its thrusting direction is toward the upper steel plate body. The distance between the displacement sensor and the upper steel plate support is the same as the distance between the CNC jacking device and the upper steel plate body.

[0033] like Figure 3 As shown, a cavity 15 is formed on the ball slide 11, and the ball 20 rotates in the cavity.

[0034] The fixer 8 is an iron hoop, and the fixing hoop 14 is a hoop made of iron plate and fixed on the pier 13.

[0035] The present invention provides a method for resetting a bent beam, which specifically comprises the following steps:

[0036] S1. Set up the automatic resetting device of the bending beam of the present invention.

[0037] When setting up the automatic resetting device for the bent beam on a new bridge, it only needs to be set up before the support is withdrawn and installed at the bent beam position; for old bridges, it is only necessary to use a jack to lift the bent beam and set the automatic resetting device for the bent beam underneath.

[0038] S2. The higher end of the lower surface of the upper steel plate body 4 and the upper surface of the support seat are located on the outside of the curved beam, and the lower end is located on the inside of the curved beam; there are several displacement sensors 17 set on the outer baffle 6 of the lower steel plate in the outer direction of the curved beam.

[0039] The upper surface of the support seat is an inclined surface. Since the curved beam is easy to move outward during use, when the outer side of the support seat is higher, the curved beam is not easy to move outward during use.

[0040] When installing the displacement sensors 17, since the curved beam moves outward, it is sufficient to evenly distribute several displacement sensors 17 along the outer side of the curved beam to measure the deflection of the outer side of the curved beam. Similarly, the number of CNC pushers 18 is the same as the number of displacement sensors 17, and these CNC pushers 18 are also evenly distributed along the outer side of the curved beam. This allows the curved beam to be reset in both lateral and diagonal movement. The vehicle travel direction is the longitudinal direction, the transverse direction is perpendicular to the vehicle travel direction, and the diagonal direction is between the longitudinal and transverse directions.

[0041] S3. Anchor the upper bolts of the upper steel plate to the bottom of the curved beam, and anchor the lower bolts of the lower steel plate above the pier 13; fix the column 15 to the outside of the pier using a fixing hoop.

[0042] For old bridges, the curved beam can be lifted using a jack, and then the upper bolt 1 is anchored to the bottom of the curved beam, and the lower bolt 5 is anchored above the pier 13.

[0043] S4. The displacement sensor measures the distance between the displacement sensor and the upper steel plate. When the displacement sensor detects that the bending beam is larger than the normal deformation, the CNC pusher starts working; when the displacement sensor detects that the bending beam is equal to the normal deformation, the CNC pusher stops working.

[0044] The bridge is affected by temperature and generates temperature stress. The generated temperature stress σ is:

[0045] σ=αΔ T E

[0046] Where α is the thermal expansion coefficient, Δ T is the difference between the current temperature and the lowest temperature of the day, and E is the elastic modulus of the material.

[0047] According to the bending beam mechanics method, the displacement change Δ caused by concrete shrinkage due to temperature / vehicle tire centrifugal force on the bending beam is derived. i1 for:

[0048] Δ i1 =αΔ T L+βΔ K K

[0049] Where L is the length of the beam from the starting point to the calculation point, Δ K is the tire deformation offset, K is the tire offset coefficient (0.8-1.1). The displacement change caused by prestressing, concrete creep, etc. is:

[0050] Δ i2 =(εp +ε c )L

[0051] Among them, ε p is the prestressing strain, ε c is the strain caused by creep.

[0052] Total deformation of the bent beam Δ i for:

[0053] Δ i =Δ i1 +Δ i2

[0054] The present invention sets a normal deformation of the curved beam to 3 cm. First, the distance between the displacement sensor and the upper steel plate when undeformed is measured. The sum of the distance between the displacement sensor and the upper steel plate when undeformed and the normal deformation is a preset value. When the displacement sensor measures that the distance between the displacement sensor and the upper steel plate is less than the preset value, the CNC pusher is activated. When the distance between the displacement sensor and the upper steel plate returns to the preset value, the CNC pusher is deactivated. A proximity switch can be provided on the CNC pusher. When both the proximity switch and the displacement sensor detect that the distance between the upper steel plate is less than the preset value, the CNC pusher is activated.

Claims

1. A bending beam automatic reset device, characterized in that: include: The lower steel plate comprises a lower steel plate body, lower bolts arranged below the lower steel plate body, outer baffles arranged above the lower steel plate body, and inner baffles arranged between the outer baffles; the lower steel plate is used to be fixed on the pier column; The upper steel plate includes an upper steel plate body, an upper bolt arranged above the upper steel plate body, and a support arranged below the upper steel plate body. The support of the upper steel plate is between the outer baffle and the inner baffle of the lower steel plate. The bottom surface of the upper steel plate body is an inclined surface. The upper steel plate is used to support the curved beam. A support seat, the left and right ends of which are arranged between the inner baffles of the lower steel plate, and the upper and lower ends of which are arranged between the upper steel plate body and the lower steel plate body, and the upper surface of which is an inclined surface; the support seat is used to assist the bending beam in resetting; A displacement sensor is provided on the outer baffle of the lower steel plate and is used to detect the displacement of the upper steel plate; as well as The pushing mechanism is arranged on the outer side of the upper steel plate and is used to start working when the displacement of the bent beam exceeds the limit to push the upper steel plate to restore the bent beam to its original position.

2. The automatic resetting device for a curved beam according to claim 1, characterized in that: The support seat includes a rubber pad, an intermediate steel plate, a ball slide plate and a fixed steel plate arranged in sequence from bottom to top; the upper surface of the rubber pad is an inclined surface, and the fixed steel plate is fixedly arranged on the lower surface of the upper steel plate.

3. The automatic resetting device for a curved beam according to claim 2, characterized in that: The upper surface of the rubber pad and the bottom surface of the upper steel plate body have the same inclination angle, and the inclination angle is greater than the super-elevation angle of the curved beam by 10°.

4. The automatic resetting device for a curved beam according to claim 1, characterized in that: The pushing mechanism includes a column, a fixing hoop, a fixer and a CNC pusher; the column is fixed to the outside of the pier through the fixing hoop, the fixer is fixed to the top of the column, and the fixer is flush with the upper steel plate body; the CNC pusher is fixed to the column through the fixer, and the thrust direction of the CNC pusher is toward the upper steel plate body.

5. The automatic resetting device for a curved beam according to claim 4, characterized in that: The distance between the displacement sensor and the support of the upper steel plate is the same as the distance between the numerically controlled pusher and the upper steel plate body.

6. A method for resetting a bent beam, characterized in that: The steps include: S1. Set the bending beam automatic reset device according to any one of claims 1-5; S2. The upper surface of the upper plate and the upper surface of the support seat are located at the higher end of the outer side of the curved beam and the lower end of the curved beam; there are several sensors provided on the baffle of the lower steel plate in the outer direction of the curved beam; S3. Anchor the upper bolts of the upper steel plate to the bottom of the curved beam and the lower bolts of the lower steel plate to the top of the pier. Secure the columns to the outside of the pier using fixing hoops. S4. The displacement sensor measures the distance between the displacement sensor and the upper steel plate. When the displacement sensor detects that the bending beam is larger than the normal deformation, the CNC pusher starts working; when the displacement sensor detects that the bending beam is equal to the normal deformation, the CNC pusher stops working.

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