A multi-stage differential pushing orthogonal linkage walking type jack for a curved bridge and a construction method thereof

Abstract

The application discloses a multi-stage differential pushing orthogonal linkage walking type jack for a curved bridge, which comprises a base, a horizontal transverse jack, a horizontal longitudinal jack, a guide frame, a longitudinal sliding box and a vertical jack. One end of the guide frame is hingedly arranged on the base, and the other end is free. The longitudinal sliding box is arranged in the guide frame and can only slide longitudinally along the guide frame. The cylindrical vertical jack is arranged in the longitudinal sliding box and can rotate freely. The horizontal longitudinal jack is fixed on a U-shaped end plate of the guide frame at the hinged end of the guide frame, is connected with the longitudinal sliding box and is used for longitudinal pushing. The horizontal transverse jack is fixed on the base, is arranged on the free end side of the guide frame, is slidingly hinged with the guide frame, is perpendicular to the horizontal longitudinal jack in the initial state and is matched with a construction method. The differential ratio calculation method of the two horizontal jacks is provided, the circular arc pushing of the vertical jack is realized, and a practical new device and a matched construction method are provided for the pushing construction of the curved bridge with an arbitrary curvature radius.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a multi-stage differential speed jacking positive cross-linking walking jack for curved bridges and its construction method. Background Technology

[0002] The incremental launching method is widely used in the construction of continuous beam bridges with uniform cross-sections, including single-point launching and multi-point launching. In recent years, the multi-point launching method using walking jacks has been widely adopted. This method does not affect traffic or navigation under the bridge and can be well applied to the launching construction of straight bridges. For the launching construction of curved beam bridges, the traditional launching process involves first launching along the tangent of the circular curve. When the deviation between the beam and the designed line reaches a limit, the horizontal jacks are adjusted to correct the deviation. This requires simultaneous launching and correction, which is quite difficult. The Hengqin Port Lotus Bridge (curve radius 60m) steel box girder was the first to use a differential launching process. During the curved launching process, through the differential launching control system, the inner and outer jacks have the same angular velocity but different linear velocity, resulting in a difference in launching stroke between the two sides of the jacks. Because the jacking method does not affect traffic flow under the bridge, it is widely used in the construction of overpass bridges, such as newly built interchange ramp bridges across existing highways. Currently, the jacking construction of curved beam bridges is mostly done by substituting straight lines for curves, which means that even if differential jacking is used, frequent lateral corrections are still required. For example, in the differential jacking construction of the Lotus Bridge at Hengqin Port, a single jacking is 300mm, and corrections are made once every three jackings. The main reason for this is that the jacking path is inconsistent with the circular curve, which causes the walking jacks to fail to reach the expected position during the jacking process.

[0003] like Figure 1 (a) In the diagram, O represents the center of the curved bridge, and R1 and R2 represent the radii of the arcs at the inner and outer jack positions, respectively. The inner and outer jacks are placed at points q1 and q2, respectively. Ideally, they should be pushed to points q3 and q4, respectively. When using a straight line to represent the curve, the walking jacks move in a straight line, pushing along line segments L1 and L2. Since the distance D between points q1 and q3 remains constant, when point q1 is pushed to the midpoint q1' of line segment L1, point q3 needs to be pushed to point q3'. This point is far beyond the midpoint of line segment L3. However, points q1 and q3 are both located on arc S1 with radius R1, and their pushing speeds are the same. This leads to a contradiction. Even with differential pushing, the requirements for pushing a curved bridge cannot be met. If it can be pushed along the arc, that is, along arcs S1 and S2, as... Figure 1 (b) When point q1 is pushed to the midpoint q1' of the S1 arc segment, the pushing arc angle is θ, and point q3 is pushed to the midpoint q3' of the S3 arc segment, satisfying the deformation requirements. It is worthwhile to develop a new type of walking jack that can adapt to the arc pushing construction of bridges with arbitrary curve radii, which would have significant engineering practical value. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a simple and easy-to-construct curved bridge differential jacking positive cross-linking moving walking jack, and provides its construction method.

[0005] The technical solution of this invention to solve the above-mentioned technical problems is: a multi-stage differential speed jacking positive cross-linking walking jack for curved bridges, including a base, a transverse horizontal jack, a longitudinal horizontal jack, a guide frame, a longitudinal slide box, and a vertical jack; one end of the guide frame is hinged to the base, and the other end is free; the longitudinal slide box is placed in the guide frame and can only slide along the side plate of the guide frame; the cylindrical vertical jack is placed in the longitudinal slide box and can rotate freely; the longitudinal horizontal jack is fixed to the U-shaped end plate of the guide frame at the hinged end of the guide frame and connected to the longitudinal slide box for longitudinal jacking; the transverse horizontal jack is fixed to the base, located on the free end side of the guide frame, and is slidably hinged to the guide frame; initially, the transverse horizontal jack is perpendicular to the longitudinal horizontal jack; by controlling the jacking speed of the transverse horizontal jack and the longitudinal horizontal jack, the arc jacking of the vertical jack is realized, adapting to the jacking construction of bridges with arbitrary curvature radii.

[0006] The aforementioned multi-stage differential jacking positive cross-linking walking jack for curved bridges includes a base plate, a slide rail, a horizontal jack fixing block, an arc hinge stop block, an arc hinge cover plate, horizontal positioning points, and longitudinal positioning lines. The slide rail is located on the base plate. There are two horizontal jack fixing blocks, symmetrically installed on both sides of one end of the base plate, used to fix the horizontal jacks and adapt to both clockwise and counterclockwise jacking of the curved bridge. The arc hinge stop block and the arc hinge cover plate are welded to the middle of the other end of the base plate, forming a ring shape. The outer arc radius of the two blocks is the same, while the inner arc radius of the arc hinge cover plate is slightly smaller, making its width larger than that of the arc hinge stop block. The horizontal positioning points are symmetrically set on the side of the arc hinge stop block on the base plate, and the line connecting the two horizontal positioning points passes through the center of the arc hinge stop block for positioning.

[0007] The aforementioned multi-stage differential jacking positive cross-linking walking jack for curved bridges uses a smooth stainless steel plate or polytetrafluoroethylene plate for the slide to minimize the coefficient of friction and reduce the jacking force.

[0008] The aforementioned multi-stage differential jacking positive cross-linking walking jack for curved bridges includes a horizontal jack housing, a horizontal jack piston, a horizontal jack limiting block, a semi-circular jacking connector, and a round-headed pin. There are two horizontal jack limiting blocks, each with a cross-section approximately inverted right-angled triangle, symmetrically installed in the upper middle position of the horizontal jack housing. The smallest acute angle is located at half the height of the horizontal jack housing, forming two parallel vertical planes for fixing the horizontal jack. The semi-circular jacking connector is fixed to the middle of the piston end face, with its outer end being a semi-cylinder and connected to a round-headed pin at the bottom.

[0009] The aforementioned multi-stage differential jacking positive cross-linking walking jack for curved bridges includes a horizontal jack fixing block comprising: a front semi-circular baffle, an L-shaped arc side plate, and a rear semi-circular baffle. Two L-shaped arc side plates are symmetrically arranged to form the main body. The inner arc radius of the L-shaped arc side plate is the same as the diameter of the horizontal jack shell. The distance between the front and rear semi-circular baffles is the same as the cylindrical height of the horizontal jack shell. The space formed by the front semi-circular baffle, L-shaped arc side plate, and rear semi-circular baffle limits the horizontal jack shell, preventing it from moving in any direction, effectively fixing it to the base plate. The height of the front semi-circular baffle is less than the thickness of the horizontal jack shell, allowing the horizontal jack piston to extend and retract freely. The front and rear semi-circular baffles respectively bear the tension and pressure during the jacking process.

[0010] The aforementioned multi-stage differential jacking positive cross-linking walking jack for curved bridges includes a longitudinal horizontal jack housing, a longitudinal horizontal jack piston, and a common pin. The common pin is used to connect with the longitudinal slide box. The diameter of the transverse horizontal jack piston is larger than the diameter of the longitudinal horizontal jack piston, preferably more than twice as large.

[0011] The aforementioned multi-stage differential jacking positive cross-linking walking jack for curved bridges includes a guide frame comprising a guide frame side plate, a guide frame front plate, a guide frame U-shaped end plate, a longitudinal horizontal jack fixing hole, a circular arc hinge, an inner limiting base plate, a sliding connecting ear plate, an ear plate limiting strip, and a guide frame positioning line. The two guide frame side plates, the guide frame front plate, and the guide frame U-shaped end plate form a convex frame. The opening in the middle of the guide frame U-shaped end plate is the longitudinal horizontal jack fixing hole for fixing the longitudinal horizontal jack. The circular arc hinge is located in the middle of one side of the guide frame U-shaped end plate, and its diameter is the same as the inner diameter of the circular arc hinge stop block, allowing the guide frame to... One end rotates freely, and the inner limiting base plate is located in the convex frame of the guide frame. It is trapezoidal and its three sides are connected to the U-shaped end plate of the guide frame. The free side is used for positioning the longitudinal sliding box. The ear plate limiting strip consists of two L-shaped plates, which are welded to the free end of the guide frame side plate to fix the sliding connecting ear plate. This allows the sliding connecting ear plate to bear tension and pressure and to slide along the guide frame side plate. The sliding connecting ear plate is used to connect the transverse horizontal jack. The guide frame positioning line is engraved on the lower middle part of the outer side of the guide frame front plate for the initial positioning of the guide frame. In the initial state, the guide frame positioning line is aligned with the longitudinal positioning line on the base.

[0012] The aforementioned multi-stage differential jacking positive cross-linking walking jack for curved bridges includes a sliding connecting ear plate comprising a perforated connecting cylinder, an arc-shaped connecting plate, and a square limiting block. The diameter of the perforation in the perforated connecting cylinder is the same as that of the round-headed pin, and its function is to pull back the guide frame when the horizontal jack retracts. The arc-shaped connecting plate is a cuboid with half a cylinder removed from its side, and the diameter of the cylinder is the same as that of the perforated connecting cylinder. The perforated connecting cylinder is connected to the lower part of the arc-shaped connecting plate, and its diameter is also the same as that of the cylinder of the semi-circular jacking connector, used to withstand the jacking pressure of the horizontal jack. The square limiting block is slightly higher than the arc-shaped connecting plate, and its two ends are placed inside the ear plate limiting strip.

[0013] The aforementioned multi-stage differential jacking positive cross-linking walking jack for curved bridges includes a longitudinal slide box comprising a longitudinal slide box frame, a longitudinal slide box space, and longitudinal slide box ear plates. The longitudinal slide box frame is a perforated regular square prism with a side length equal to the free side of the inner limiting base plate of the guide frame, ensuring that the longitudinal slide box can only move longitudinally along the side plate of the guide frame. The cylindrical space inside the longitudinal slide box frame is the longitudinal slide box space, with a diameter the same as that of the vertical jack, allowing the vertical jack to rotate freely. There are two longitudinal slide box ear plates with a circular hole in the middle, the diameter of which is the same as the diameter of the middle position of a common pin. They are welded to the middle position of the longitudinal slide box frame to connect the longitudinal slide box and the longitudinal horizontal jack.

[0014] A method for constructing a curved bridge using multi-stage differential speed jacking includes the following steps:

[0015] Step 1: Arrange walking jacks according to the structural characteristics of the curved bridge to be jacked. Arrange at least 2 sets in the longitudinal direction of the bridge. Arrange at least 2 walking jacks in the transverse direction of each set according to the number of longitudinal beam webs. Arrange the vertical jacks directly below the webs. Adjust the base plate so that the line connecting the two transverse positioning points is located on the radius of the curved bridge.

[0016] Step 2: Set the first-level differential ratio. Assume that n walking jacks are arranged in the transverse direction of the bridge, and the radii of the arcs corresponding to their positions are R1, R2, ..., R... n Then the first-stage differential ratio is set as follows:

[0017] ,

[0018] In the formula, Let R be the radius of the arc. i The jacking speed of the vertical jack at the location;

[0019] That is:

[0020] ;

[0021] Step 3: Determine the jacking arc length of the vertical jacks at each transverse bridge position. First, determine R. nThe jacking arc length of the vertical jack of the walking jack is S. n ,Right now:

[0022] ,

[0023] In the formula, t represents time;

[0024] Then the transverse bridge R i The jacking arc length of the vertical jack at this position is:

[0025] ;

[0026] The jacking arc length needs to meet the following requirements:

[0027] ,

[0028] ,

[0029] In the formula, S max R i The unit is m;

[0030] Step 4: Set the two-stage differential speed ratio to determine the jacking distance of the horizontal jacks and the longitudinal horizontal jacks. The distance from the horizontal positioning point to the center of the horizontal jack is A. The ratio of the jacking speed of the longitudinal horizontal jacks and the horizontal horizontal jacks to the jacking speed of the vertical jacks is taken as:

[0031] ,

[0032] ,

[0033] The jacking distances for the longitudinal horizontal jack and the transverse horizontal jack are as follows:

[0034] ,

[0035] When a single jacking operation is completed, the lateral deviation between the theoretical and actual positions of the vertical jacks is less than 0.004 mm.

[0036] Step 5: According to the set two-stage differential speed ratio, the jacking construction is carried out in cycles, and the accuracy is strictly monitored and controlled until the bridge is jacked into place. No lateral correction work is required throughout the process.

[0037] The technical advantages of this invention are as follows: the multi-stage differential speed jacking positive cross-linking walking jack and construction method for curved bridges can be applied to the arc jacking construction of curved bridges with any curve radius by adjusting the two-stage differential speed ratio, achieving the ideal state that no correction is required during the jacking process. Compared with traditional jacking methods, it can significantly increase the longitudinal bridge distance of each jacking, reduce the number of jacking operations, and further improve the efficiency of curved bridge jacking construction. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the two differential push structures of the present invention.

[0039] Figure 2 This is a schematic diagram of the invention, showing how the horizontal and vertical jacks work together to achieve arc-shaped pushing.

[0040] Figure 3 This is a schematic diagram of the positive cross-linking dynamic circular curve jacking scheme proposed in this invention.

[0041] Figure 4 This is a schematic diagram of the present invention based on the approximate jacking speed ratio and jacking error analysis.

[0042] Figure 5 This is a diagram showing the relationship between the lateral offset Δ and the jacking distance in the present invention.

[0043] Figure 6 This is a graph showing the relationship between the lateral offset Δ and the pushing error during the pushing process, based on the approximate pushing speed ratio of the present invention.

[0044] Figure 7 This is a graph showing the relationship between the jacking distance S and the jacking error when the jacking speed is approximately equal to the jacking speed of the present invention.

[0045] Figure 8 The arc radius R and the jacking distance S of the present invention are... max Relationship diagram.

[0046] Figure 9 The top push S of the present invention max Relationship between the radius R of the arc and the error of the jacking distance.

[0047] Figure 10 This is a graph showing the relationship between the arc radius R and the pushing distance error when the pushing distance S=R / 50 in the scheme of this invention.

[0048] Figure 11 This is a front-view three-dimensional diagram of the walking jack according to an embodiment of the present invention.

[0049] Figure 12 This is a plan view of the walking jack according to an embodiment of the present invention.

[0050] Figure 13 This is a side view of a walking jack according to an embodiment of the present invention.

[0051] Figure 14 This is a front view of the walking jack according to an embodiment of the present invention.

[0052] Figure 15 This is a three-dimensional exploded view of the walking jack according to an embodiment of the present invention.

[0053] Figure 16This is a schematic diagram of the walking jack base according to an embodiment of the present invention.

[0054] Figure 17 This is an exploded elevation view of the horizontal jack fixing block of the walking jack according to an embodiment of the present invention.

[0055] Figure 18 This is a three-dimensional diagram of the walking jack horizontal jack according to an embodiment of the present invention.

[0056] Figure 19 This is a plan view of the horizontal jack of the walking jack according to an embodiment of the present invention.

[0057] Figure 20 This is a three-dimensional diagram of the horizontal placement of the walking jack according to an embodiment of the present invention.

[0058] Figure 21 This is a plan view of the horizontal jack placement of the walking jack according to an embodiment of the present invention.

[0059] Figure 22 This is a three-dimensional diagram of the longitudinal horizontal jack of the walking jack according to an embodiment of the present invention.

[0060] Figure 23 This is a front-view three-dimensional view of the walking jack guide frame according to an embodiment of the present invention.

[0061] Figure 24 This is a plan view of the walking jack guide frame according to an embodiment of the present invention.

[0062] Figure 25 This is a rear three-dimensional view of the walking jack guide frame according to an embodiment of the present invention.

[0063] Figure 26 This is a rear-view three-dimensional view of the walking jack according to an embodiment of the present invention.

[0064] Figure 27 This is an exploded elevation view of the sliding connecting lug plate of the walking jack according to an embodiment of the present invention.

[0065] Figure 28 This is a three-dimensional view of the longitudinal sliding box of the walking jack according to an embodiment of the present invention.

[0066] Figure 29 This is a three-dimensional diagram of the walking jack after it pushes in accordance with an embodiment of the present invention.

[0067] Figure 30 This is a plan view of the walking jack after it pushes in accordance with an embodiment of the present invention.

[0068] Figure 31 This is a rear side view of the walking jack according to an embodiment of the present invention.

[0069] Figure 32This is a construction layout diagram for the jacking of a curved bridge using a walking jack, according to an embodiment of the present invention. Detailed Implementation

[0070] I. Conceptualization of the Circular Curve Jacking Scheme

[0071] In the process of ordinary walking jack jacking construction, usually only one jack works alone. After the vertical jack lifts the structure, the longitudinal horizontal jack pushes the structure forward. When correction is needed, the transverse horizontal jack works to push the structure in the transverse direction. So, is it possible to simultaneously push the transverse jack and the longitudinal jack to achieve arc jacking?

[0072] When the value of variable x is small, according to the Taylor expansion formula:

[0073] (1)

[0074] (2)

[0075] In the formula, This represents the factorial of 3. It represents a higher-order small quantity.

[0076] like Figure 2 In the xoy coordinate system shown, the radius of the arc is R, and the pushing angle is θ. Then we have:

[0077] (3)

[0078] (4)

[0079] (5)

[0080] Therefore:

[0081] (6)

[0082] We can obtain:

[0083] (7)

[0084] Assume the pushing velocities along the x and y directions are v and v, respectively. x v y ,but:

[0085] (8)

[0086] In the formula, t represents any time. Substituting equation (8) into equation (7) yields:

[0087] (9)

[0088] From equation (9), we can see that when vy When v is a constant value, x It is a linear function of time t, that is, as time t increases, v x The value of v is getting larger and larger, that is, v x Not a constant value, such as Figure 1 (b) During differential jacking on an arc, if the central angles corresponding to the jacking arcs on the inner and outer sides are the same, then the ratio of their jacking speeds is: , is a constant value, that is, the differential jacking with a constant speed ratio can be achieved in current engineering, but differential jacking with a non-constant speed ratio as in equation (9) cannot be achieved at present.

[0089] To achieve circular arc jacking, two jacks typically need to work simultaneously with a constant speed ratio. This invention proposes a jacking structure with two jacks operating in a positive-joint motion, such as... Figure 3 The longitudinal horizontal jacks are installed on the guide frame, which can rotate. The vertical jacks are pushed in an arc by the differential speed of the longitudinal and transverse horizontal jacks.

[0090] II. Theoretical Analysis of the Scheme

[0091] like Figure 3 Assume the vertical jack is located at a point with coordinates (x0, y0), denoted as point 0, whose coordinates are known. Point 0 lies on a circular curve with radius R, then the following conditions are met:

[0092] (10)

[0093] The slope of line 10 passing through points 1 and 0 is:

[0094] (11)

[0095] Assuming the horizontal jack is positioned at a distance from x-axis A, and point 2 lies on line 10, then the following conditions are met:

[0096] (12)

[0097] From the system of equations:

[0098] (13)

[0099] The coordinates of point 2 can be obtained as follows:

[0100] (14)

[0101] The jacking distances D1 and D2 of the longitudinal horizontal jack and the transverse horizontal jack are respectively:

[0102] (15)

[0103] From equation (10), we can obtain:

[0104] (16)

[0105] Substituting equation (16) into equation (15) simplifies the pushing distances D1 and D2 respectively:

[0106] (17)

[0107] (18)

[0108] Assuming the vertical jack's movement distance S is known, then the coordinates of point O are:

[0109] (19)

[0110] The ratios of the jacking speed of the longitudinal and transverse horizontal jacks to the actual jacking speed of the vertical jacks are as follows:

[0111] (20)

[0112] (twenty one)

[0113] In the formula, v0 is the moving speed of the vertical jack, t is the time, and S is the moving distance of the vertical jack.

[0114] S can be approximated as:

[0115] (twenty two)

[0116] When the jacking distance is small The approximate ratios of the jacking speeds of the longitudinal and transverse horizontal jacks to those of the vertical jack can be obtained as follows:

[0117] (twenty three)

[0118] (twenty four)

[0119] The error in the jacking speed ratio is defined as:

[0120] (25)

[0121] (26)

[0122] like Figure 4 Let d and D be the jacking distances of the horizontal and vertical jacks according to the approximate jacking speed ratio, respectively. Then:

[0123] (27)

[0124] After the push, the coordinates of point 2 are:

[0125] (28)

[0126] The superscript "^" is used to distinguish the coordinates from the theoretical actual coordinates.

[0127] The coordinates of point 0 can be obtained using triangle similarity:

[0128] (29)

[0129] We can obtain:

[0130] (30)

[0131] The coordinates of point 0 are:

[0132] (31)

[0133] Define the error of the position coordinate point 0 of the vertical jack as:

[0134] (32)

[0135] In the formula, coordinates The coordinates are obtained from differential pushing, calculated according to formula (31). These are the actual coordinate values, calculated according to formula (19).

[0136] III. Error Analysis of the Scheme's Top Push

[0137] like Figure 3 The lateral deviation Δ in the figure has a one-to-one correspondence with the coordinate of point 0, as shown in equation (33). Lateral correction is controlled by the value of lateral deviation Δ, which is generally around 30mm. Therefore, the maximum value of lateral deviation Δ is taken as 30mm for analysis.

[0138] (33)

[0139] The jacking distance S of the vertical jack is calculated as shown in equation (34), and the results are as follows: Figure 6 When the lateral offset Δ is 30mm, the jacking distances for R=30m, 100m, and 300m are 1.342m, 2.450m, and 4.243m, respectively.

[0140] (34)

[0141] like Figure 6 Taking A = 1.5m, when using an approximate jacking speed ratio, the error in the jacking speed ratio is very small, less than 0.02%. 10The error is positive because the length of the arc is slightly greater than the length of its chord, e 20 The error is negative, and its value is less than e. 10 As R increases, the error decreases rapidly.

[0142] The pushing error under each R is as follows Figure 7 Therefore, e 0x Close to 0, significantly less than e 0y The greater the jacking distance, the more exponentially the error increases. At the same jacking distance, the error decreases significantly with increasing R. 0y The main reason is that when pushing according to the arc length, the actual pushing distance is longer than the chord length, e 0x The value reflects the magnitude of the lateral offset.

[0143] How to determine the appropriate maximum single-push distance S max ? with e 0x An analysis was conducted on various values ​​of R with a limit of 0.004 mm, and it was found that the jacking distance S... max Directly related to the radius R of the arc:

[0144] (35)

[0145] (36)

[0146] In the formula, S max The unit of R is m.

[0147] Arc radius R and jacking distance S max Relationship such as Figure 8 When R=30m, the maximum jacking distance S max When the radius is 1.5m and the radius is R=500m, the maximum jacking distance S is... max =12.5m, but in reality, such a large pushing distance is generally not possible. Therefore, when R>500m, we take S. max =12.5m, indicating that a large jacking distance can be obtained under each R.

[0148] Top push S max The relationship between the radius R of the arc and the error of the jacking distance is as follows: Figure 9 Therefore, e 0x The errors are all less than 0.0041 mm. When R > 500 m, S is taken as... max =12.5m is a constant value, and the jacking distance does not continue to increase. 0x The error decreases rapidly; when R < 500m, e 0y The error increases with increasing R, ranging from 0.15mm to 0.35mm, showing a basically linear relationship. Similarly, when R > 500mm, the error increases due to S. max Let e ​​be a constant.0y The error decreases rapidly. If the jacking distance is taken as S=R / 50, the relationship between the jacking distance and the error is as follows: Figure 10 At this time, the correlation coefficient R 2 =1, which is a linear relationship, consistent with differential push, i.e., it satisfies:

[0149] (37)

[0150] In the formula, S i S j R represents the length of the pushing arc, respectively. i R j Let represent the radii of the pushing arc, and C be a constant.

[0151] Example: Multi-stage differential speed jacking positive cross-linking walking jack

[0152] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0153] like Figures 11-23 As shown, a multi-stage differential speed jacking positive cross-linking walking jack for curved bridges includes a base 1, a transverse horizontal jack 2, a longitudinal horizontal jack 3, a guide frame 4, a longitudinal sliding box 5, and a vertical jack 6. One end of the guide frame 4 is hinged to the base 1, while the other end is free. The longitudinal sliding box 5 is placed in the guide frame 4 and can only slide along the direction of the guide frame side plate 41. The cylindrical vertical jack 6 is placed in the longitudinal sliding box 5 and can rotate freely. The longitudinal horizontal jack 3 is fixed to the U-shaped end plate 43 of the guide frame at the hinged end of the guide frame 4 and is connected to the longitudinal sliding box 5 for longitudinal jacking. The transverse horizontal jack 2 is fixed to the base 1 and located on the free end side of the guide frame 4, and is slidably hinged to the guide frame 4. In the initial state, the transverse horizontal jack 2 is perpendicular to the longitudinal horizontal jack 3. By controlling the jacking speed of the transverse horizontal jack 2 and the longitudinal horizontal jack 3, the arc jacking of the vertical jack 6 can be achieved, adapting to the jacking construction of bridges with arbitrary curvature radii.

[0154] like Figure 16As shown, the base 1 includes a base plate 11, a slide rail 12, a horizontal jack fixing block 13, an arc hinge stop block 14, an arc hinge cover plate 15, a horizontal positioning point 16, and a longitudinal positioning line 17. The slide rail 12 is located on the base plate 11 and is made of smooth stainless steel or polytetrafluoroethylene plate to minimize the coefficient of friction and reduce the jacking force. There are two horizontal jack fixing blocks 13, which are symmetrically installed on both sides of one end of the base plate 11 to fix the horizontal jack 2 and adapt to both clockwise and counterclockwise jacking situations of the curved bridge. The arc hinge stop block 14 and the arc hinge cover plate 15 are welded to the middle position of the other end of the base plate 11 and form a ring. The outer arc radius of the two is the same, and the inner arc radius of the arc hinge cover plate 15 is slightly smaller, making its width larger than that of the arc hinge stop block 14. The horizontal positioning point 16 is symmetrically arranged on the side of the arc hinge stop block 14 on the base plate 11. The line connecting the two horizontal positioning points 16 passes through the center of the arc hinge stop block 14 and is used for positioning.

[0155] like Figure 18 , Figure 19 As shown, the horizontal jack 2 includes a horizontal jack housing 21, a horizontal jack piston 22, a horizontal jack limiting block 23, a semi-circular push connector 24, and a round-headed pin 25. There are two horizontal jack limiting blocks 23, with cross-sections approximately inverted right-angled triangles. They are symmetrically installed at the upper middle position of the horizontal jack housing 21, with the smallest acute angle located at half the height of the horizontal jack housing 21, forming two parallel vertical planes for fixing the horizontal jack 2. The semi-circular push connector 24 is fixed at the middle position of the end face of the horizontal jack piston 22, with the outer end being a semi-cylinder and the bottom connected to the round-headed pin 25.

[0156] like Figure 17 , Figure 20 , Figure 21 The horizontal jack fixing block 13 includes: a front semi-circular baffle 131, an L-shaped arc side plate 132, and a rear semi-circular baffle 133; the two L-shaped arc side plates 132 are symmetrically arranged to form the main body, the inner arc radius of the L-shaped arc side plate 132 is the same as the diameter of the horizontal jack housing 21, and the distance between the front semi-circular baffle 131 and the rear semi-circular baffle 133 is the same as the cylindrical height of the horizontal jack housing 21. The space formed by the baffle 131, the L-shaped arc side plate 132, and the rear semicircular baffle 133 limits the transverse horizontal jack housing 21, preventing it from moving in any direction, which is equivalent to fixing it to the base plate 11. The height of the front semicircular baffle 131 is smaller than the thickness of the transverse horizontal jack housing 21, allowing the transverse horizontal jack piston 22 to extend and retract freely. The front semicircular baffle 131 and the rear semicircular baffle 133 respectively bear the tension and pressure during the jacking process.

[0157] like Figure 22As shown, the longitudinal horizontal jack 3 includes a longitudinal horizontal jack housing 31, a longitudinal horizontal jack piston 32, and a common pin 33; the common pin 33 is used to connect with the longitudinal slide box 5, and the diameter of the transverse horizontal jack piston 22 is larger than the diameter of the longitudinal horizontal jack piston 32, preferably more than twice as large.

[0158] like Figures 23-26 As shown, the guide frame 4 includes a guide frame side plate 41, a guide frame front end plate 42, a guide frame U-shaped end plate 43, a longitudinal horizontal jack fixing hole 44, an arc hinge 45, an inner limiting base plate 46, a sliding connecting ear plate 47, an ear plate limiting strip 48, and a guide frame positioning line 49. The two guide frame side plates 41, the guide frame front end plate 42, and the guide frame U-shaped end plate 43 form a convex frame. The opening in the middle of the guide frame U-shaped end plate 43 is the longitudinal horizontal jack fixing hole 44, used to fix the longitudinal horizontal jack 3. The arc hinge 45 is located in the middle of one side of the guide frame U-shaped end plate 43, and its diameter is the same as the inner diameter of the arc hinge stop block 14, allowing the guide frame to rotate freely at one end. The inner limiting base plate 46 is located inside the convex frame of the guide frame 4, and is trapezoidal. Three sides are connected to the U-shaped end plate 43 of the guide frame. The free side is used for positioning the longitudinal sliding box 5. The ear plate limiting strip 48 consists of two L-shaped plates, which are welded to the free end side of the guide frame side plate 41 to fix the sliding connecting ear plate 47, so that the sliding connecting ear plate 47 can bear tension and pressure, and can slide along the guide frame side plate 41. The sliding connecting ear plate 47 is used to connect the transverse horizontal jack 2. The guide frame positioning line 49 is engraved on the lower middle part of the outer side of the guide frame front plate 42 for the initial positioning of the guide frame 4. In the initial state, the guide frame positioning line 49 is aligned with the longitudinal positioning line 17 on the base 1.

[0159] like Figure 27 As shown, the sliding connecting ear plate 47 includes a perforated connecting cylinder 471, an arc-shaped connecting plate 472, and a square limiting block 473. The diameter of the perforation in the perforated connecting cylinder 471 is the same as that of the round-headed pin 25. Its function is to pull back the guide frame 4 when the horizontal jack 2 retracts. The arc-shaped connecting plate 472 is a cuboid with half of a cylinder removed from its side. The diameter of the cylinder is the same as that of the perforated connecting cylinder 471. The perforated connecting cylinder 471 is connected to the lower part of the arc-shaped connecting plate 472. The diameter of the cylinder is also the same as that of the cylinder of the semi-circular push connector 24. It is used to bear the pushing pressure of the horizontal jack 2. The square limiting block 473 is slightly higher than the arc-shaped connecting plate 472, and its two ends are placed inside the ear plate limiting strip 48.

[0160] like Figure 28As shown, the longitudinal slide box 5 includes a longitudinal slide box frame 51, a longitudinal slide box space 52, and a longitudinal slide box ear plate 53. The longitudinal slide box frame 51 is an open regular square prism with a side length that is the same as the free side of the inner limiting base plate 46 of the guide frame 4, ensuring that the longitudinal slide box 5 can only move longitudinally along the side plate 41 of the guide frame. The cylindrical space inside the longitudinal slide box frame 51 is the longitudinal slide box space 52, with a diameter the same as that of the vertical jack 6, allowing the vertical jack 6 to rotate freely. There are two longitudinal slide box ear plates 53, with a round hole in the middle, the diameter of which is the same as the diameter of the middle position of the ordinary pin 33. They are welded to the middle position of the frame of the longitudinal slide box frame 51 and are used to connect the longitudinal slide box 5 and the longitudinal horizontal jack 3.

[0161] like Figures 29-31 The image shows the state after the push, from... Figure 30 It is evident that during the jacking process, the vertical jack 6 achieved a circular arc jacking.

[0162] like Figure 32 As shown, a multi-stage differential speed jacking construction method for curved bridges includes the following steps:

[0163] Step 1: Arrange the walking-type jacks according to the structural characteristics of the curved bridge to be jacked. The curvature radius of the curved bridge is R=105m, with a single box girder and single cell section (2 webs), 3 spans, and jacking construction on one span. Figure 32 The dashed span in the middle is the span to be jacked up. Three sets of walking jacks are arranged in the longitudinal direction of the bridge, and two walking jacks are arranged in the transverse direction of each set. The vertical jack 6 is arranged directly below the web plate. Adjust the bottom plate 11 so that the line connecting the two transverse positioning points 16 is located on the radius of the curved bridge.

[0164] Step 2: Set the first-stage differential ratio. Two walking jacks are arranged in the transverse direction of the bridge, with corresponding arc radii of 100m and 110m respectively. The first-stage differential ratio is then set as follows:

[0165] (38)

[0166] Step 3: Determine the jacking arc length of the vertical jack 3 at each transverse bridge position. First, determine the jacking arc length of the vertical jack 6 of the walking jack at position R2 as S2.

[0167] If the jacking arc length is taken as S2 = 2m, then:

[0168] (39)

[0169] (40)

[0170] (41)

[0171] (42)

[0172] Step 4: Set the two-stage differential speed ratio, determine the jacking distance of the horizontal jack 2 and the longitudinal horizontal jack 3, the distance A from the horizontal positioning point 16 to the center of the horizontal jack 2 is 2.5m, and the ratio of the jacking speed of the longitudinal horizontal jack 3 and the horizontal horizontal jack 2 to the jacking speed of the vertical jack 6 is:

[0173] The position of R1 is:

[0174] (43)

[0175] (44)

[0176] The position of R2 is:

[0177] (45)

[0178] (46)

[0179] The jacking distance of longitudinal horizontal jack 3 and transverse horizontal jack 2:

[0180] The position of R1 is:

[0181] (47)

[0182] The position of R2 is:

[0183] (48)

[0184] Step 5: According to the set two-stage differential speed ratio, the jacking construction is carried out in cycles, and the accuracy is strictly monitored and controlled. The jacking construction is completed after 22 jackings (Note: the 22nd jacking does not need to be pushed 2m. The bridge can be jacked to the predetermined position and then stopped). Theoretically, the lateral deviation is less than 0.088mm, and no lateral correction operation is required throughout the process.

[0185] The above embodiment illustrates clockwise jacking construction of a curved bridge. If jacking is counterclockwise, the horizontal jack 2 is placed on the opposite horizontal jack fixing block 13. Furthermore, for straight bridges, this walking jack can also be used for jacking construction. In this case, the horizontal jack 2 is kept stationary, and only the longitudinal horizontal jack 3 is used for longitudinal jacking. After reaching the predetermined jacking distance, if lateral correction is needed, the longitudinal horizontal jack 3 is kept stationary, and the horizontal jack 2 is used for correction. Other steps are the same as with ordinary walking jacks.

[0186] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A multi-stage differential speed jacking positive cross-linking walking jack for curved bridges, characterized in that: The system includes a base (1), a horizontal jack (2), a vertical jack (3), a guide frame (4), a vertical slide box (5), and a vertical jack (6). One end of the guide frame (4) is hinged to the base (1), while the other end is free. The vertical slide box (5) is placed in the guide frame (4) and can only slide along the direction of the guide frame side plate (41). The cylindrical vertical jack (6) is placed inside the vertical slide box (5) and can rotate freely. The vertical jack (3) is fixed to the hinged end of the guide frame (4). The guide frame U-shaped end plate (43) is connected to the longitudinal sliding box (5) for longitudinal jacking. The transverse horizontal jack (2) is fixed on the base (1) and located on the free end side of the guide frame (4). It is slidably hinged to the guide frame (4). In the initial state, the transverse horizontal jack (2) is perpendicular to the longitudinal horizontal jack (3). By controlling the jacking speed of the transverse horizontal jack (2) and the longitudinal horizontal jack (3), the arc jacking of the vertical jack (6) is realized, which is suitable for the jacking construction of bridges with arbitrary curvature radius.

2. The curved bridge multi-stage differential jacking positive cross-linking moving walking jack according to claim 1, characterized in that: The base (1) includes a base plate (11), a slide rail (12), a horizontal jack fixing block (13), an arc hinge stop block (14), an arc hinge cover plate (15), a horizontal positioning point (16), and a longitudinal positioning line (17); the slide rail (12) is located on the base plate (11); there are two horizontal jack fixing blocks (13), which are symmetrically installed on both sides of one end of the base plate (11) to fix the horizontal jack (2), which is suitable for both clockwise and counterclockwise rotation of the curved bridge. In the pushing action, the arc hinge block (14) and the arc hinge cover plate (15) are welded to the middle position of the other end of the base plate (11) in a circular ring shape. The outer arc radius of the two is the same, and the inner arc radius of the arc hinge cover plate (15) is slightly smaller, making its width larger than that of the arc hinge block (14). The lateral positioning points (16) are symmetrically set on the side of the arc hinge block (14) of the base plate (11). The line connecting the two lateral positioning points (16) passes through the center of the arc hinge block (14) for positioning.

3. The curved bridge multi-stage differential jacking positive cross-linking moving walking jack according to claim 2, characterized in that: The slide (12) is made of smooth stainless steel plate or polytetrafluoroethylene plate to minimize the coefficient of friction and reduce the jacking force.

4. The curved bridge multi-stage differential jacking positive cross-linking moving walking jack according to claim 2, characterized in that: The horizontal jack (2) includes a horizontal jack housing (21), a horizontal jack piston (22), a horizontal jack limiting block (23), a semi-circular push connector (24), and a round-headed pin (25). There are two horizontal jack limiting blocks (23), the cross-section of which is approximately an inverted right triangle. They are symmetrically installed in the middle and slightly above the horizontal jack housing (21). The smallest acute angle is located at half the height of the horizontal jack housing (21), forming two parallel vertical planes for fixing the horizontal jack (2). The semi-circular push connector (24) is fixed in the middle of the end face of the horizontal jack piston (22). The outer end is a semi-cylinder, and the bottom is connected to the round-headed pin (25).

5. The curved bridge multi-stage differential jacking positive cross-linking moving walking jack according to claim 4, characterized in that: The horizontal jack fixing block (13) includes: a front semi-circular baffle (131), an L-shaped arc side plate (132), and a rear semi-circular baffle (133); the two L-shaped arc side plates (132) are symmetrically arranged to form the main body. The inner arc radius of the L-shaped arc side plate (132) is the same as the diameter of the horizontal jack housing (21). The distance between the front semi-circular baffle (131) and the rear semi-circular baffle (133) is the same as the cylindrical height of the horizontal jack housing (21). The space formed by the plate (131), the L-shaped arc side plate (132), and the rear semi-circular baffle (133) limits the transverse horizontal jack housing (21) so that it cannot move in any direction, which is equivalent to being fixed to the base plate (11). The height of the front semi-circular baffle (131) is smaller than the thickness of the transverse horizontal jack housing (21), so that the transverse horizontal jack piston (22) can extend and retract freely. The front semi-circular baffle (131) and the rear semi-circular baffle (133) bear the tension and pressure during the jacking process, respectively.

6. The curved bridge multi-stage differential jacking positive cross-linking moving walking jack according to claim 5, characterized in that: The longitudinal horizontal jack (3) includes a longitudinal horizontal jack housing (31), a longitudinal horizontal jack piston (32), and a common pin (33); the common pin (33) is used to connect with the longitudinal slide box (5), and the diameter of the transverse horizontal jack piston (22) is larger than the diameter of the longitudinal horizontal jack piston (32), preferably more than twice as large.

7. The curved bridge multi-stage differential jacking positive cross-linking moving walking jack according to claim 6, characterized in that: The guide frame (4) includes a guide frame side plate (41), a guide frame front end plate (42), a guide frame U-shaped end plate (43), a longitudinal horizontal jack fixing hole (44), an arc hinge (45), an inner limiting base plate (46), a sliding connecting ear plate (47), an ear plate limiting strip (48), and a guide frame positioning line (49). The two guide frame side plates (41), the guide frame front end plate (42), and the guide frame U-shaped end plate (43) form a convex frame. The opening in the middle of the guide frame U-shaped end plate (43) is the longitudinal horizontal jack fixing hole (44), used to fix the longitudinal horizontal jack (3). The arc hinge (45) is located in the middle of one side of the guide frame U-shaped end plate (43), and its diameter is the same as the inner diameter of the arc hinge stop block (14), so that the guide frame can rotate freely at one end. The inner limiting base plate (46) is located in the convex frame of the guide frame (4), and is trapezoidal. Three sides are connected to the U-shaped end plate (43) of the guide frame. The free side is used for positioning the longitudinal sliding box (5). The ear plate limiting strip (48) consists of two L-shaped plates, which are welded to the free end of the guide frame side plate (41) to fix the sliding connecting ear plate (47), so that the sliding connecting ear plate (47) can bear tension and pressure, and can slide along the guide frame side plate (41). The sliding connecting ear plate (47) is used to connect the transverse horizontal jack (2). The guide frame positioning line (49) is engraved on the lower middle part of the outer side of the guide frame front plate (42) for positioning the guide frame (4) in the initial state. In the initial state, the guide frame positioning line (49) is aligned with the longitudinal positioning line (17) on the base (1).

8. The curved bridge multi-stage differential jacking positive cross-linking moving walking jack according to claim 7, characterized in that: The sliding connecting ear plate (47) includes an open connecting cylinder (471), an arc-shaped connecting plate (472), and a square limiting block (473). The diameter of the opening in the open connecting cylinder (471) is the same as that of the round-headed pin (25). Its function is to pull back the guide frame (4) when the horizontal jack (2) retracts. The arc-shaped connecting plate (472) is a cuboid with half of a cylinder removed from its side. The diameter of the cylinder is the same as that of the open connecting cylinder (471). The open connecting cylinder (471) is connected to the lower part of the arc-shaped connecting plate (472). The diameter of the cylinder is also the same as that of the cylinder of the semi-circular push connector (24). It is used to bear the pushing pressure of the horizontal jack (2). The square limiting block (473) is slightly higher than the arc-shaped connecting plate (472). Both ends are placed inside the ear plate limiting strip (48).

9. The curved bridge multi-stage differential jacking positive cross-linking moving walking jack according to claim 8, characterized in that: The longitudinal slide box (5) includes a longitudinal slide box frame (51), a longitudinal slide box space (52), and a longitudinal slide box ear plate (53). The longitudinal slide box frame (51) is a perforated regular square prism with a side length equal to the free side of the inner limiting base plate (46) of the guide frame (4), ensuring that the longitudinal slide box (5) can only move longitudinally along the side plate (41) of the guide frame. The cylindrical space inside the longitudinal slide box frame (51) is the longitudinal slide box space (52), with a diameter equal to that of the vertical jack (6), allowing the vertical jack (6) to rotate freely. There are two longitudinal slide box ear plates (53), with a round hole in the middle. The diameter is the same as that of the middle position of the ordinary pin (33), and they are welded to the middle position of the frame of the longitudinal slide box frame (51) to connect the longitudinal slide box (5) and the longitudinal horizontal jack (3).

10. A method for multi-stage differential speed jacking construction of a curved bridge, characterized in that, Includes the following steps: A construction method for a multi-stage differential jacking positive cross-linking walking jack for curved bridges as described in any one of claims 1 to 9 is provided, comprising the following steps: Step 1: Arrange walking jacks according to the structural characteristics of the curved bridge to be jacked. Arrange at least 2 sets in the longitudinal direction of the bridge, and arrange at least 2 walking jacks in the transverse direction of each set according to the number of longitudinal beam webs. Arrange the vertical jacks (6) directly below the webs. Adjust the bottom plate (11) so that the line connecting the two transverse positioning points (16) is located on the radius of the curved bridge. Step 2: Set the first-level differential ratio. Assume that n walking jacks are arranged in the transverse direction of the bridge, and the radii of the arcs corresponding to their positions are R1, R2, ..., R... n Then the first-stage differential ratio is set as follows: ， In the formula, Let R be the radius of the arc. i The jacking speed of the vertical jack (6) at the position; That is: ； Step 3: Determine the jacking arc length of the vertical jacks (6) at each transverse bridge position, first determine R n The jacking arc length of the vertical jack (6) of the walking jack is S. n ,Right now: ， In the formula, t represents time; Then the transverse bridge R i The jacking arc length of the vertical jack (6) at the position is: ； The jacking arc length needs to meet the following requirements: ， ， In the formula, S max R i The unit is m; Step 4: Set the secondary differential speed ratio to determine the jacking distance of the horizontal jack (2) and the longitudinal horizontal jack (3). The distance from the horizontal positioning point (16) to the center of the horizontal jack (2) is A. The ratio of the jacking speed of the longitudinal horizontal jack (3) and the horizontal horizontal jack (2) to the jacking speed of the vertical jack (6) is taken as: ， ， The jacking distances of the longitudinal horizontal jack (3) and the transverse horizontal jack (2) are as follows: ， When a single jacking operation is completed, the lateral deviation between the theoretical position and the actual position of the vertical jack (6) is less than 0.004 mm; Step 5: According to the set two-stage differential speed ratio, the jacking construction is carried out in cycles, and the accuracy is strictly monitored and controlled until the bridge is jacked into place. No lateral correction work is required throughout the process.

Images