Bridge jacking support raising device and its construction method

Abstract

This invention provides a bridge jacking bearing raising device and its construction method. The supporting rigid bushing contains multiple intersecting inner support frames, which are integral with the supporting rigid bushing. The lower part of the outer ring of the supporting rigid bushing extends beyond the lower surface of the inner support frames, forming a new cover structure for the supporting rigid bushing. This cover structure is used to cover the pad stone of the cap beam. Support filling material is poured inside the supporting rigid bushing to form the bearing raising device. By placing the supporting rigid bushing on the pad stone of the cap beam and then pouring support filling material inside the supporting rigid bushing, the construction period is shortened. Previously, a steel pipe scaffold was required for jacking; now, only a hydraulic system needs to be placed on the cap beam and pier to jack the transverse diaphragms, saving costs and time.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and in particular to a bridge jacking support raising device and its construction method. Background Technology

[0002] Adjustments to bridge routes often lead to changes in the bridge's design elevation, requiring bridge jacking as a solution. In existing bridge jacking and heightening construction techniques, the goal is typically achieved by increasing the height of the bearing pads to raise the bearing elevation. Currently, after the bridge is jacked up, traditional methods for increasing the height of the bearing pads include using steel plates, adding precast concrete blocks, and casting concrete pads. Using steel plates is suitable for bridges with a jacking height of less than 5cm, but it consumes a large amount of steel, requires high corrosion resistance, and results in high material costs. Precast concrete blocks are prone to damage during prefabrication due to formwork removal, leading to edge crushing or pad splitting under pressure, affecting bearing stability and making it unsuitable for large-tonnage or high-height bridges. Cast concrete pads are only suitable for bridges with high jacking heights. However, due to on-site construction, the strength, flatness, and thickness of the cast concrete pads cannot be well controlled, and the long curing period increases the construction time.

[0003] Chinese patent "CN202755320U" describes a special bearing pad for bridge jacking and heightening. It includes a concrete pad with a reinforcing sleeve covering its outer layer. An external connecting rod is provided on the outer wall of the reinforcing sleeve. This invention, by adding a reinforcing sleeve to the outer layer of the concrete pad, increases its load-bearing capacity and protects it. Under pressure, it prevents the edge concrete from crushing or the pad from splitting.

[0004] The above-mentioned structure adopts a ring structure, which has poor stability. It does not use the cast-in-place process, and the concrete piers also have the disadvantages that the strength, flatness and thickness cannot be well controlled. Summary of the Invention

[0005] The main objective of this invention is to provide a bridge jacking bearing heightening device and its construction method, which solves the problem that traditional methods of increasing the height of bearing pads, such as padding with steel plates, adding precast concrete blocks, and casting-in-place concrete pads, cannot effectively control their quality.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a bridge jacking support raising device, wherein the inner support bushing is provided with multiple cross-arranged inner support frames, the inner support frames and the support bushing are an integral structure, the lower part of the outer ring of the support bushing extends out of the lower surface of the inner support frame, so that the support bushing forms a cover structure, the cover structure of the support bushing is used to cover the pad stone of the cap beam, and the support bushing is filled with support filler to form the support raising device.

[0007] In the preferred embodiment, a tie rod is also provided. The tie rod has a T-shaped structure, with the length of the upper horizontal bar of the tie rod being shorter than the width of the supporting rigid bushing grid, and the lower rod body of the tie rod being set inside the pad stone.

[0008] In the preferred embodiment, the pad stone has multiple pull holes, the upper end of the pull holes has a trumpet-shaped opening, the lower end of the pull rod is set inside the pull hole, and the space between the lower end of the pull rod and the pull hole is filled with cement or epoxy mortar.

[0009] In the preferred embodiment, the lower end of the pull rod is also provided with a protruding pull block, the diameter of which is larger than the diameter of the pull rod, and the pull rod is located at the bottom of the pull hole.

[0010] In the preferred embodiment, at least two pressure plates are also provided. The two pressure plates are respectively set on both sides of the supporting steel bushing. Pressure rod seats are provided at both ends of the pressure plates. A lifting screw is provided at the upper end of the pressure rod seat. The lifting screw is threadedly connected to the pressure rod seat. A hexagonal nut is provided at the top of the lifting screw. The hexagonal nut is used to press the supporting steel bushing against the lower surface of the bridge deck support pier to press it tightly onto the pad stone.

[0011] In the preferred embodiment, the lower surface of the pressure plate is provided with an L-shaped shock-absorbing pad, and the recessed structure at the lower end of the shock-absorbing pad is hung on the outer ring of the supporting rigid bushing.

[0012] In the preferred embodiment, a positioning basket is also provided, which is placed on the upper end of the pad stone. The positioning basket has an inverted "Z" shaped cross section. The upper bent section hangs on the upper end of the pad stone, and the lower bent section rests against the lower end of the support steel bushing. The inner surface of the support steel bushing is in contact with the outer surface of the positioning basket. The positioning basket is made of rubber or wood.

[0013] In the preferred embodiment, a vibrator is also provided on one side of the supporting rigid bushing;

[0014] The supporting filler is C60 grout or epoxy mortar.

[0015] In the preferred embodiment, a climbing ladder is also provided, a sliding plate is provided on the climbing ladder, and a pulley is provided at the top of the climbing ladder. The pull rope passes around the pulley at the top and is connected to the sliding plate.

[0016] The supporting rigid bushing is set on the sliding plate. The rope pulls the sliding plate to send the supporting rigid bushing to the position of the pad stone of the cap beam.

[0017] The method includes:

[0018] S1. Multiple jacks are installed at the bridge deck support piers. Sleepers are installed at both ends of the jacks. Distance sensors are installed on one side of the jacks. The distance sensors monitor the lifting height of the bridge deck support piers. The lifting distance of the bridge deck support piers is kept consistent. Multiple jacks start to lift the bridge. The distance sensors monitor the lifting height of the bridge.

[0019] S2. Remove the original rubber piers from the pad stones of the bridge jacking beam.

[0020] S3. Make construction holes on the pad stone, install tie rods inside the holes, and fill the holes with C60 grout or epoxy mortar. After the grout inside the holes has solidified, install the support bushing.

[0021] S3. First, place the upper end of the climbing ladder on the top of the cover beam, then place the support steel bushing on the sliding plate, and manually pull the sliding plate up so that the support steel bushing on the sliding plate is close to the pad stone.

[0022] S4. First, place a positioning basket around the outer ring of the pad stone. Then, manually use a pry bar to put the support steel bushing around the positioning basket. Then, install multiple pressure plates on the top of the support steel bushing and adjust the pressure rod seats at both ends of the pressure plates. The upper end of the lifting screw of the pressure rod seat presses against the lower surface of the bridge deck support pier to press the support steel bushing onto the pad stone.

[0023] S5. Install a vibrator on one side of the supporting steel bushing, and then start filling the supporting steel bushing with C60 grout or epoxy mortar. Each cell inside the supporting steel bushing is not interconnected. The vibrator vibrates the C60 grout. After each cell inside the supporting steel bushing is filled, it is cured.

[0024] S6. After the support steel bushing is cured, the pressure plate and vibrator are removed. Rubber blocks are installed above the support steel bushing. After all the pad stones on the cap beam are poured, multiple jacks begin to descend synchronously, and the bridge deck support blocks press on the rubber blocks.

[0025] S7. Remove the jacks and place them on the sliding plate. Use the sliding plate to remove multiple jacks to complete the construction.

[0026] This invention provides a bridge jacking support raising device and its construction method. A supporting rigid bushing is fitted onto the pad stone of the cap beam, and then supporting filler is poured inside the bushing. The construction period is short; previously, a steel pipe scaffold was required for jacking, but now only a hydraulic system is placed on the cap beam and pier to lift the diaphragms, saving costs and time. After the supporting rigid bushing is installed, high-strength grout is poured, and the beam can be lowered after 24 hours. The entire bridge jacking construction takes approximately 5 days, compared to approximately 20 days according to the design plan, saving approximately 15 days of construction time. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] Figure 1 This is a schematic diagram of the synchronous lifting mechanism of the present invention.

[0029] Figure 2 This is a schematic diagram of the main view after the synchronous lifting of the present invention;

[0030] Figure 3 This is a structural diagram of the installation position of the supporting rigid bushing of the present invention;

[0031] Figure 4 This is a cross-sectional view of the supporting rigid bushing structure of the present invention;

[0032] Figure 5 This is a structural diagram of the present invention after the jack is lifted and the filler is poured;

[0033] Figure 6 This is a structural diagram of the invention after the golden dome is lifted and the rubber blocks are installed;

[0034] Figure 7 This is a structural diagram of the mounting pad tie rod of the present invention;

[0035] Figure 8 This is a structural diagram of the tie rod of the present invention after the filler is cast;

[0036] Figure 9 This is a diagram of the pressure plate installation structure of the present invention;

[0037] Figure 10 This is a diagram of the sliding plate mounting structure of the present invention;

[0038] Figure 11 This is a structural diagram of the sliding plate lifting support rigid bushing of the present invention.

[0039] In the diagram: 1. Bridge deck support pier; 2. Jack; 3. Cap beam; 4. Support steel bushing; 401. Inner support frame; 5. Support filler; 6. Distance sensor; 7. Pad stone; 8. Rubber block; 9. Pull hole; 10. Tie rod; 1001. Pressure plate; 11. Pressure rod seat; 12. Lifting screw; 1201. Vibration damping pad; 13. Positioning basket; 14. Vibrator; 15. Climbing ladder; 16. Sliding plate; 17. Limiting pad; 18. Detailed Implementation

[0040] Example 1

[0041] like Figures 1-11As shown, a bridge jacking support raising device includes a supporting rigid bushing 4 with multiple intersecting inner support frames 401 inside. The inner support frames 401 and the supporting rigid bushing 4 are an integral structure. The lower part of the outer ring of the supporting rigid bushing 4 extends beyond the lower surface of the inner support frames 401, forming a cover structure. The cover structure of the supporting rigid bushing 4 is used to cover the pad stone 7 of the cap beam 3. Support filling material 5 is poured inside the supporting rigid bushing 4 to form the support raising device. By fitting the supporting rigid bushing 4 onto the pad stone 7 of the cap beam 3 and then pouring the support filling material 5 inside the supporting rigid bushing 4, the construction period is short.

[0042] A nine-grid low steel box with a height of 15cm and a steel plate thickness of 2cm is nested above the pad stone (the part nested into the original support pad stone is 5cm). The dividing steel plates inside the grid are 9cm high, and the spaces between the dividing steel plates are filled with C60 grout or epoxy mortar.

[0043] In the preferred embodiment, a tie rod 10 is also provided. The tie rod 10 has a T-shaped structure, with the length of the upper horizontal bar of the tie rod 10 being shorter than the width of the 4 grids supporting the rigid bushing. The lower rod of the tie rod 10 is located inside the pad stone 7. The tie rod 10 can strengthen the connection structure between the support filler 5 and the pad stone 7.

[0044] In the preferred embodiment, the pad stone 7 has multiple pull holes 9, each with a flared opening at its upper end. The lower end of the pull rod 10 is positioned inside the pull hole 9, and the space between the lower end of the pull rod 10 and the pull hole 9 is filled with cement or epoxy mortar. First, the pull rod 10 is fixed to the pad stone 7 using cement or epoxy mortar, and then the support bushing 4 is installed.

[0045] In a preferred embodiment, the lower end of the pull rod 10 is further provided with a protruding pull block 1001, the diameter of which is larger than the diameter of the pull rod 10. The pull rod 10 is located at the bottom of the pull hole 9. The protruding pull block 1001 serves to tighten the rod.

[0046] In the preferred embodiment, at least two pressure plates 11 are also provided, which are respectively arranged on both sides of the supporting rigid bushing 4. Pressure rod seats 12 are provided at both ends of the pressure plates 11. A lifting screw 1201 is provided at the upper end of the pressure rod seat 12, and the lifting screw 1201 is threadedly connected to the pressure rod seat 12. A hexagonal nut is provided at the top of the lifting screw 1201, which is used to press against the lower surface of the bridge deck supporting pier 1 to press the supporting rigid bushing 4 onto the pad stone 7. The two pressure plates 11 achieve the technical effect of reverse pressing, pressing the supporting rigid bushing 4 onto the pad stone 7.

[0047] In the preferred embodiment, the lower surface of the pressure plate 11 is provided with an L-shaped shock-absorbing pad 13, and the lower end of the shock-absorbing pad 13 is recessed and hangs on the outer ring of the supporting rigid bushing 4. The shock-absorbing pad 13 plays a role in shock absorption.

[0048] In the preferred embodiment, a positioning basket 14 is also provided. The positioning basket 14 is fitted onto the upper end of the pad stone 7. The positioning basket 14 has an inverted "Z" shaped cross-section. The upper bent section hangs on the upper end of the pad stone 7, and the lower bent section rests against the lower end of the supporting rigid bushing 4. The inner surface of the supporting rigid bushing 4 is in contact with the outer surface of the positioning basket 14. The positioning basket 14 is made of rubber or wood. Some filler is placed and leaks out from the side of the supporting rigid bushing 4.

[0049] In the preferred embodiment, a vibrator 15 is also provided on one side of the supporting rigid bushing 4; the vibrator 15 makes the supporting filler 5 fill more effectively.

[0050] The support filler 5 is C60 grout or epoxy mortar.

[0051] In the preferred embodiment, a climbing ladder 16 is also provided, on which a sliding plate 17 is provided. A pulley is provided at the top of the climbing ladder 16, and a rope is connected to the sliding plate 17 after passing over the pulley at the top. A supporting rigid bushing 4 is provided on the sliding plate 17. The rope pulls the sliding plate 17 to send the supporting rigid bushing 4 to the position of the pad stone 7 on the cap beam 3. The supporting rigid bushing 4 is then transported onto the cap beam 3.

[0052] Example 2

[0053] Further explanation in conjunction with Example 1, such as Figure 1-11 The structure shown has multiple jacks 2 at the bridge deck support pier 1. Sleepers are set at both the upper and lower ends of the jacks 2. A distance sensor 6 is installed on one side of the jacks 2. The distance sensor 6 monitors the lifting height of the bridge deck support pier 1. The lifting distance of the bridge deck support pier 1 is kept consistent. Multiple jacks 2 start to lift the bridge. The distance sensor 6 monitors the lifting height of the bridge.

[0054] On the bridge jacking principle cap beam 3, the original rubber pier 8 is removed;

[0055] Make construction holes 9 on the pad stone 7, install tie rods 10 inside the holes 9, and fill the holes 9 with C60 grout or epoxy mortar. After the grout inside the holes 9 has solidified, install the support bushing 4.

[0056] First, place the upper end of the climbing ladder 16 on the top of the cover beam 3, then place the support steel bushing 4 on the sliding plate 17, and manually pull the sliding plate 17 to rise. The support steel bushing 4 on the sliding plate 17 is close to the pad stone 7.

[0057] First, a positioning basket 14 is placed around the outer ring of the pad stone 7. Then, a pry bar is used manually to put the support steel bushing 4 around the positioning basket 14. Then, multiple pressure plates 11 are installed on the top of the support steel bushing 4. The pressure rod seats 12 at both ends of the pressure plate 11 are adjusted. The upper end of the lifting screw 1201 of the pressure rod seat 12 presses against the lower surface of the bridge deck support pier 1, pressing the support steel bushing 4 onto the pad stone 7.

[0058] A vibrator 15 is installed on one side of the supporting steel bushing 4. Then, C60 grout or epoxy mortar is filled into the supporting steel bushing 4. Each cell inside the supporting steel bushing 4 is not interconnected. The vibrator 15 vibrates the C60 grout. After each cell inside the supporting steel bushing 4 is filled, it is cured.

[0059] After the support bushing 4 is cured, the pressure plate 11 and vibrator 15 are removed. Rubber blocks 8 are installed above the support bushing 4. After all the pad stones 7 on the cap beam 3 are poured, multiple jacks 2 begin to descend synchronously, and the bridge deck support block 1 presses on the rubber block 8.

[0060] Remove jack 2 and place it on sliding plate 17. Use sliding plate 17 to remove multiple jacks 2 to complete the construction.

[0061] The bridge jacking scheme adopts a method of proportional synchronous jacking combined with the stacking and padding of temporary steel blocks.

[0062] Temporary steel pads and 200-ton synchronous jacks were installed on the top surface of the existing abutments and pier cap beams. The T-beam transverse diaphragms were lifted synchronously by all the jacks on half of the bridge, raising the entire beam body by 13 centimeters (as shown in Figures 1-4).

[0063] Each set of jacks is equipped with safety valves and other protective devices. Even if the oil supply system and return system suddenly fail or there is a power outage, each set of jacks will maintain the required pressure. As the bridge is lifted, temporary steel pads are placed on the original bridge bearing pads to change the effective stroke of the jacks (3 cm). Through alternating reciprocating motion, the beam is lifted to 13 cm. After the last stroke of lifting is completed, the jack screw self-locking device is locked to convert the hydraulic pressure holding of the jacks into rigid force.

[0064] Displacement sensors are installed on both sides of the lifting beam to measure its lifting height in real time. A synchronous lifting pump station is connected to the control host. The synchronous lifting pump station receives the height measurements from the displacement sensors and transmits them to the control host. The control host then controls the synchronous lifting pump station to simultaneously lift all the jacks. The stacked temporary steel support blocks are connected and secured to each other by bolts passing through holes around their perimeter and nuts.

[0065] To reduce the bridge jacking height, expedite construction, minimize safety risks, and reduce road occupancy time, the bridge jacking design was optimized. A nine-grid low steel box, 15cm high and 2cm thick, was nested above the bearing pad (5cm embedded into the original bearing pad). The dividing steel plates within the grid were 9cm high, and the spaces between the dividing plates were filled with C60 grout or epoxy mortar.

[0066] After the steel casing is installed, high-strength grout is poured, and the beam can be lowered 24 hours later.

[0067] The optimized plan requires approximately 5 days to complete the entire bridge jacking construction, while the plan according to the original design requires approximately 20 days, thus saving approximately 15 days of construction time.

[0068] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A bridge jacking support raising device, characterized in that: The inner support frame (4) is provided with multiple cross-arranged inner support frames (401). The inner support frame (401) and the support frame (4) are an integral structure. The lower part of the outer ring of the support frame (4) extends out of the lower surface of the inner support frame (401), so that the support frame (4) forms a cover structure. The cover structure of the support frame (4) is used to cover the pad stone (7) of the cap beam (3). The support filler (5) is poured inside the support frame (4) to form a support raising device. It is also equipped with a tie rod (10), which has a T-shaped structure. The length of the upper horizontal bar of the tie rod (10) is shorter than the width of the support bushing (4) grid, and the lower rod of the tie rod (10) is set inside the pad stone (7). The pad stone (7) has multiple pull holes (9), the upper end of the pull hole (9) is provided with a trumpet-shaped opening, the lower end of the pull rod (10) is set inside the pull hole (9), and the lower end of the pull rod (10) and the pull hole (9) are filled with cement or epoxy mortar. At least two pressure plates (11) are also provided. The two pressure plates (11) are respectively set on both sides of the support steel bushing (4). Pressure rod seats (12) are provided at both ends of the pressure plates (11). A lifting screw (1201) is provided at the upper end of the pressure rod seat (12). The lifting screw (1201) is threadedly connected to the pressure rod seat (12). A hexagonal nut is provided at the top of the lifting screw (1201). The hexagonal nut is used to press the support steel bushing (4) onto the pad stone (7) by resting against the lower surface of the bridge deck support pier (1).

2. The bridge jacking support raising device according to claim 1, characterized in that: The lower end of the pull rod (10) is also provided with a protruding pull block (1001). The diameter of the pull block (1001) is larger than the diameter of the pull rod (10). The pull rod (10) is set at the bottom of the pull hole (9).

3. The bridge jacking support raising device according to claim 1, characterized in that: The lower surface of the pressure plate (11) is provided with an L-shaped shock-absorbing pad (13), and the lower end of the shock-absorbing pad (13) is recessed and hung on the outer ring of the supporting rigid bushing (4).

4. The bridge jacking support raising device according to claim 1, characterized in that: A positioning basket (14) is also provided. The positioning basket (14) is placed on the upper end of the pad stone (7). The cross section of the positioning basket (14) is an inverted "Z" shape. The upper bent section is hung on the upper end of the pad stone (7), and the lower bent section rests on the lower end of the support rigid bushing (4). The inner surface of the support rigid bushing (4) is in contact with the outer surface of the positioning basket (14). The material of the positioning basket (14) is rubber or wood.

5. The bridge jacking support raising device according to claim 1, characterized in that: A vibrator (15) is also provided on one side of the supporting rigid bushing (4); The supporting filler (5) is C60 grout or epoxy mortar.

6. The bridge jacking support raising device according to claim 1, characterized in that: It is also equipped with a climbing ladder (16), a sliding plate (17) on the climbing ladder (16), and a pulley at the top of the climbing ladder (16). The pull rope passes around the pulley at the top and connects to the sliding plate (17). The supporting steel bushing (4) is set on the sliding plate (17). The rope pulls the sliding plate (17) to send the supporting steel bushing (4) to the pad stone (7) position of the cover beam (3).

7. A construction method for a bridge jacking support raising device according to any one of claims 1-6, characterized in that: The method includes: S1. Multiple jacks (2) are installed at the bridge deck support pier (1). Sleepers are installed at both ends of the jacks (2). A distance sensor (6) is installed on one side of the jacks (2). The distance sensor (6) monitors the lifting height of the bridge deck support pier (1). The lifting distance of the bridge deck support pier (1) remains consistent. Multiple jacks (2) start to lift the bridge. The distance sensor (6) monitors the lifting height of the bridge. S2. On the pad stone (7) of the bridge jacking principle cap beam (3), remove the original rubber block (8). S3. Make construction holes (9) on the pad stone (7), install tie rods (10) inside the holes (9), and fill the holes (9) with C60 grout or epoxy mortar. After the grout inside the holes (9) has solidified, install the support steel bushing (4). S3. First, place the upper end of the climbing ladder (16) on the top of the cover beam (3), then place the support steel bushing (4) on the sliding plate (17), and manually pull the sliding plate (17) to rise. The support steel bushing (4) on the sliding plate (17) is close to the pad stone (7). S4. First, place a positioning basket (14) around the outer ring of the pad stone (7). Then, manually use a pry bar to put the support steel bushing (4) around the positioning basket (14). Then, install multiple pressure plates (11) on the top of the support steel bushing (4). Adjust the pressure rod seats (12) at both ends of the pressure plate (11). The upper end of the lifting screw (1201) of the pressure rod seat (12) presses the support steel bushing (4) onto the pad stone (7) by pressing it against the lower surface of the bridge deck support pier (1). S5. Install a vibrator (15) on one side of the supporting steel bushing (4), and then start filling the supporting steel bushing (4) with C60 grout or epoxy mortar. Each cell inside the supporting steel bushing (4) is not connected to each other. The vibrator (15) vibrates the C60 grout. After each cell inside the supporting steel bushing (4) is filled, it is cured. S6. After the support steel bushing (4) is cured, the pressure plate (11) and vibrator (15) are removed. Rubber block (8) is installed above the support steel bushing (4). After all the pad stones (7) on the cap beam (3) are poured, multiple jacks (2) begin to descend synchronously, and the bridge deck support block (1) presses on the rubber block (8). S7. Remove the jacks (2). Place the jacks (2) on the sliding plate (17). Remove the multiple jacks (2) through the sliding plate (17) to complete the construction.

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