Construction method for replacing bridge expansion joint quickly in highway reconstruction and extension half-alternate traffic

Abstract

The present application relates to a kind of highway reconstruction and expansion half-width alternate traffic quick replacement bridge expansion joint construction method, comprising the following steps: cutting joint on the both sides of original expansion joint structure is constructed;Original expansion joint structure is removed;Installation pouring formwork system;Setting up temporary installation stable hanger, hoist new expansion joint structure;Pouring steel fiber concrete at the end of main beam.The beneficial effects of the present application are: the strip-shaped protective box wraps the cutting operation surface therein, and delivers cooling water through the water inlet hole, and the water outlet hole extracts the sewage containing dust, so as to avoid dust pollution generated by cutting operation, and the structure is simple and reliable, can be completed by modifying existing cutting mechanical equipment, and the construction cost is lower;New expansion joint structure can be assembled in place first, and then hoisted to the installation position by temporary stable hanger, which can effectively improve the on-site operation efficiency compared with step-by-step installation, and ensure the installation positioning accuracy.

Description

Technical Field

[0001] This invention belongs to the field of bridge expansion joint replacement construction, and particularly relates to a construction method for quickly replacing bridge expansion joints during highway reconstruction and expansion with alternating traffic on half of the road. Background Technology

[0002] With the increasing service life and traffic volume of highway bridges, various defects are prone to occur, affecting driving comfort. Expansion joints, as the connecting and transitional structures between main beams or between main beams and abutments, are particularly susceptible to defects. These defects can lead to severe impacts from passing vehicles, endangering the safety of the bridge structure. Therefore, timely repair and replacement of defective expansion joints are essential. Expansion joint replacement typically involves excavating the ends of the main beam, removing the existing expansion joint structure, and then installing a new one. However, the construction process commonly presents problems such as excessive dust from cutting and excavating the main beam, difficulty in positioning the new expansion joint structure, potential misalignment during concrete pouring, difficulties in formwork support at the beam ends, insufficient compaction of the poured concrete, long construction periods, and significant disruption to existing traffic. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a construction method for quickly replacing bridge expansion joints during highway reconstruction and expansion with alternating half-width traffic.

[0004] This construction method for quickly replacing bridge expansion joints during highway reconstruction and expansion, which involves alternating traffic on one half of the road, includes the following steps:

[0005] Step 1: The saw blade of the cutting machine in the enclosed cutting guide device passes through the strip protective box to cut the seams on both sides of the original expansion joint structure; then the original expansion joint structure is removed.

[0006] Step 2: Install the casting formwork system, attach the two end formwork pieces to the ends of the main beams on both sides, and use fixed angle steel to fix the movable side formwork to the side of the main beams;

[0007] Step 3: Set up a temporary installation stabilizing hanger. The hanger is fixed to the steel beam of the new expansion joint structure through the lower end of the hanger rod. Move the temporary installation stabilizing hanger to the installation position.

[0008] Step 4: Pour steel fiber reinforced concrete at the ends of the main beam, temporarily install stabilizing hangers and cure them by spraying water through sprinkler pipes, and set up a load-bearing frame on top of the temporary stabilizing hangers for vehicles to pass through;

[0009] Step 5: Remove the hangers, move the temporary installation stabilizing hangers out, and then pull the casting formwork system out entirely between the two main beams.

[0010] Preferably, in step one, the enclosed cutting guide device includes a cutting machine, a trolley, and a strip protective box. The cutting machine is fixed on the trolley, and the strip protective box is installed on one side of the trolley via a limiting telescopic rod. The strip protective box is equipped with a water inlet and a water outlet, and the strip protective box encloses the cutting surface. First, the cutting line is laid out on the main beams at both ends of the expansion joint. The strip protective box is then lowered from the trolley. Next, the saw blade of the cutting machine passes through the strip protective box and aligns with the cutting line. The cooling water inlet pipe is connected to the water inlet, and the water outlet pipe is connected to the water outlet. The water pump and water pump are started first, and then the cutting machine is started to construct the cutting joint along the cutting line.

[0011] Preferably, the strip protective box has a rubber strip at the bottom and a rubber sheet at the top, with strip-shaped openings on the rubber sheet, through which the saw blade cuts the main beam; counterweights are provided on both sides of the strip protective box to ensure that the strip protective box adheres to the surface of the main beam during movement.

[0012] Preferably, the casting formwork system includes end templates, movable side templates, and fixed angle steel. The end templates are arranged in pairs, with telescopic struts between the two end templates. Telescopic support feet and supporting pulleys are provided below the end templates, with the supporting pulleys supporting the cap beam. The telescopic struts and telescopic support feet are threaded or hydraulic rods. The height of the telescopic support feet is adjusted to adjust the end templates to a reasonable elevation. Then, the length of the telescopic struts is adjusted so that the end templates fit against the inner ends of the main beam. The movable side templates fit against both sides of the main beam. The movable side templates are connected and fixed to the end templates by fixed angle steel.

[0013] Preferably, the temporary installation stabilizing bracket includes a suspension frame, a front telescopic bracket, a spray pipe, a load-bearing frame, a movable pulley, and rigid supports. The movable pulley and rigid supports are installed below the suspension frame, the load-bearing frame is fixed above the suspension frame, and the spray pipe is positioned between the load-bearing frame and the suspension frame. The spray pipe is equipped with atomizing nozzles at intervals. The front telescopic bracket extends and retracts outside the suspension frame. The suspension frame is equipped with a movable sleeve, and a hanging rod is located below the movable sleeve. In step three, the position of the movable sleeve on the suspension frame is adjusted according to the distance between the steel beams of the new expansion joint structure, so that the hanging rod is aligned with and fixed to the steel beams of the new expansion joint structure.

[0014] Preferably, the movable pulley is equipped with a hydraulic jack. By adjusting the height of the hydraulic jack, the temporary installation stabilizing hanger can switch between movable pulley support and rigid support. When hoisting the new expansion joint structure, it is supported by the movable pulley, and after the new expansion joint structure is installed in place, it is supported by the rigid support.

[0015] Preferably, the load-bearing frame is equipped with end-turning frames at both ends. Both the load-bearing frame and the end-turning frames are equipped with stiffening plates. When the end-turning frames are opened, they are supported on the surface of the main beam. The load-bearing frame and the end-turning frames form a trapezoidal structure, allowing vehicles to pass over the main beam.

[0016] As a preferred option, step five is as follows: First, remove the hanger rod, raise the hydraulic jack on the movable pulley, and use the movable pulley to support the temporary installation stabilizing hanger. Then, remove the fixed angle steel and movable side formwork, adjust the telescopic support rod and telescopic support foot to separate the end formwork from the end of the main beam, and then pull the end formwork out as a whole between the two main beams.

[0017] As a preferred option, the original expansion joint structure of one half of the bridge deck is replaced first. After completing step five, steps one to five are repeated to replace the original expansion joint structure of the other half of the road surface.

[0018] The rapid replacement bridge expansion joint system for alternating half-width traffic during highway reconstruction and expansion is obtained by any of the methods described above.

[0019] The beneficial effects of this invention are:

[0020] 1) The strip-shaped protective box proposed in this technology wraps the cutting surface and delivers cooling water through the water inlet and pumps out the wastewater containing dust through the water outlet, thereby avoiding dust pollution generated during the cutting operation. The structure is simple and reliable, and can be modified based on existing cutting machinery and equipment, with low construction cost.

[0021] 2) The new expansion joint structure can be assembled in place first, and then hoisted to the installation position as a whole using a temporary stabilizing hanger. Compared with step-by-step installation, this can effectively improve on-site work efficiency and ensure installation positioning accuracy.

[0022] 3) A temporary stabilizing hanger is installed across the upper part of the new expansion joint structure. It is equipped with a spray pipe and atomizing nozzles to spray water on the poured steel fiber concrete for curing. At the same time, vehicles can pass over it during the curing period, thereby shortening the traffic closure time and reducing the impact of construction activities on existing traffic.

[0023] 4) The casting formwork system is sandwiched between the ends of the main beams, which can effectively improve the quality of concrete casting and ensure the firmness of the new expansion joint structure installation; the end formwork is set in pairs, with supporting pulleys below, which are supported on the cap beams, and can be easily pulled out from the ends of the two main beams after construction. Attached Figure Description

[0024] Figure 1 This is a top view of the bridge deck cut;

[0025] Figure 2 This is a schematic diagram of the working state of the enclosed mobile guide device cutting the bridge deck;

[0026] Figure 3 yes Figure 2 Detailed drawing of the closed-loop moving guide device for cutting the bridge deck at node A;

[0027] Figure 4 This is a three-dimensional structural diagram of a closed-loop moving guide device;

[0028] Figure 5 This is a schematic diagram of the cross-section of a closed-loop moving guide device;

[0029] Figure 6 This is a schematic diagram of the expansion joint replacement casting formwork system;

[0030] Figure 7 This is a three-dimensional structural diagram of the casting formwork system;

[0031] Figure 8 This is a schematic diagram of the fixed angle steel for the movable side formwork;

[0032] Figure 9 This is a schematic diagram showing the working state of the temporary installation of the stabilizing hanger for the new expansion joint structure;

[0033] Figure 10 This is a schematic diagram of a temporary installation stabilizing hanger structure;

[0034] Figure 11 This is a schematic diagram showing the working state of the temporary installation stabilizing hanger for installing the new expansion joint structure after the steel fiber reinforced concrete is poured.

[0035] Figure 12 This is a schematic diagram of the installation and positioning of the new expansion joint structure.

[0036] The diagram is labeled as follows: 11-Main beam, 12-Cap beam, 13-Original expansion joint structure, 14-New expansion joint structure, 15-Cutting joint, 16-Rebar installation, 21-Cutting machine, 22-Saw disc, 23-Trolley, 24-Strip protective box, 25-Counterweight block, 26-Limiting telescopic rod, 27-Rubber strip, 28-Rubber sheet, 29-Water inlet, 210-Water extraction hole, 31-Suspension frame, 32-Front telescopic hanger, 33-Modible sleeve, 34-Hanging rod, 35-Sprinkler pipe, 36-Atomizing nozzle, 37-Bearing frame, 38-End flipping frame, 39-Stiffening plate, 310-Moving pulley, 311-Rigid support leg, 41-End template, 42-Telescopic support rod, 43-Telescopic support leg, 44-Supporting pulley, 45-Modible side formwork, 46-Fixed angle steel, 47-Steel fiber reinforced concrete. Detailed Implementation

[0037] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0038] Example 1

[0039] As one example, this construction method for quickly replacing bridge expansion joint systems during highway reconstruction and expansion, with alternating traffic on half of the road, includes the following construction steps:

[0040] Step 1: Implement temporary traffic control on the bridge that needs to replace the expansion joints, close half of the bridge deck, and carry out the expansion joint replacement work.

[0041] The cutting line is laid out on the main beam 11 at both ends of the expansion joint. The strip protective box 24 is lowered from the trolley 23. Then the saw disc 22 of the cutting machine 21 is passed through the strip protective box 24 and aligned with the cutting line. The cooling water inlet pipe is connected to the water inlet hole 29 and the water pumping pipe is connected to the water pumping hole 210. The water pump and water pump are started first, and then the cutting machine 21 is started. The cutting joint 15 is constructed along the cutting line.

[0042] After the construction of the cutting joints 15 at both ends of the expansion joint is completed, the concrete of the main beams at both ends of the original expansion joint structure 13 is removed, and the original expansion joint structure 13 is demolished.

[0043] Step 2: Clean the ends of the main beam 11 and the surface of the cap beam 12, and carry out the rebar installation 16. Then install the casting formwork system, adjust the height of the telescopic support legs 43 to adjust the end formwork 41 to a reasonable elevation, then adjust the length of the telescopic support rods 42 to make the end formwork 41 fit tightly against the end of the main beam 11, and then fit the movable side formwork 45 tightly against the side of the main beam 11 and fix it to the end formwork 41 with the fixed angle steel 46.

[0044] Step 3: Assemble the new expansion joint structure 14 on site. Adjust the position of the movable sleeve 33 on the suspension frame 31 according to the distance between the steel beams of the new expansion joint structure 14, so that the hanger 34 is aligned with the steel beams of the new expansion joint structure 14, and fix the lower end of the hanger 34 to the steel beams of the new expansion joint structure 14. Then, raise the hydraulic jack on the movable pulley 310 to lift the new expansion joint structure 14. Extend the front telescopic hanger 32 across the end of the main beam 11, and then move the temporary installation stabilizing hanger forward as a whole to move the new expansion joint structure 14 above the installation position. Then, slowly lower the hydraulic jack on the movable pulley 310 to place the new expansion joint structure 14 at the end of the two main beams 11, and let the rigid support foot 311 support the main beam 11. The rigid support foot 311 supports the new expansion joint structure 14 to prevent it from shifting.

[0045] Step 4: After the new expansion joint structure 14 is in place, pour steel fiber concrete 47 into the end of the main beam 11 and vibrate and smooth it. Then, lower the end flipping frame 38 and spray water through the sprinkler pipe 35 for curing. During the curing period, vehicles pass over the load-bearing frame 37 above the new expansion joint structure 14 to reduce traffic closure time and minimize the impact of construction activities on existing traffic.

[0046] Step 5: After maintenance, remove the hanger 34 and raise the hydraulic jack on the movable pulley 310 to support the temporary installation stabilizing hanger. Remove the temporary installation stabilizing hanger, then remove the fixed angle steel 46 and the movable side formwork 45. Adjust the telescopic support rod 42 and telescopic support foot 43 to separate the end formwork 41 from the end of the main beam 11, and then pull the end formwork 41 out as a whole between the two main beams 11.

[0047] After completing step five, repeat steps one through five to replace the new expansion joint structure 14 on the other half of the road surface.

[0048] Example 2

[0049] As another embodiment, the rapid replacement bridge expansion joint system for alternating half-width traffic in highway reconstruction and expansion in Embodiment 1, such as... Figures 1 to 12 As shown, it includes a closed cutting guide device for cutting the main beam 11, a temporary installation stabilizing hanger for installing and positioning the new expansion joint structure 14, and a casting formwork system for pouring at the ends of the main beam 11.

[0050] The enclosed cutting guide device includes a cutting machine 21, a trolley 23, and a strip-shaped protective box 24. The cutting machine 21 is mounted and fixed on the trolley 23. The strip-shaped protective box 24 is installed on one side of the trolley 23 via a limiting telescopic rod 26. The saw disc 22 on the cutting machine 21 cuts the main beam 11 through the strip-shaped protective box 24. The strip-shaped protective box 24 is provided with a water inlet 29 and a water outlet 210. The strip-shaped protective box 24 encloses the cutting surface and supplies cooling water through the water inlet 29, while the water outlet 210 extracts wastewater containing dust, thereby preventing the cutting operation from being interrupted. The generated dust pollution; the bottom of the strip protective box 24 is provided with a rubber strip 27, which is in close contact with the surface of the main beam to prevent cooling water from overflowing disorderly from the bottom of the strip protective box 24. The top is provided with a rubber sheet 28, which has strip-shaped openings. The saw disc 22 cuts the main beam 11 through the strip-shaped openings to prevent cooling water from spilling out from the top of the strip protective box 24; counterweights 25 are provided on both sides of the strip protective box 24 to ensure that the strip protective box 24 is in close contact with the surface of the main beam 11 during movement and to prevent cooling water from leaking out from the bottom of the strip protective box 24.

[0051] The temporary installation stabilizing bracket includes a suspension frame 31, a front telescopic bracket 32, a spray pipe 35, a load-bearing frame 37, a movable pulley 310, and a rigid support leg 311. The movable pulley 310 and the rigid support leg 311 are installed below the suspension frame 31, and the load-bearing frame 37 is fixed above the suspension frame 31. The spray pipe 35 is located between the load-bearing frame 37 and the suspension frame. The spray pipe 35 is provided with atomizing nozzles 36 at intervals. By setting up the spray pipe 35 and the atomizing nozzles 36, water is sprayed on the poured steel fiber concrete 47 for curing to ensure the curing quality.

[0052] The front telescopic hanger 32 is installed inside the suspension frame 31 and can extend and retract freely from the suspension frame 31. The suspension frame 31 is provided with a movable sleeve 33, and the movable sleeve 33 is provided with a hanging rod 34. The lower end of the hanging rod 34 is fixed to the new expansion joint structure 14. After the new expansion joint structure 14 is pre-assembled and positioned, it is hoisted to the designated position by the hanging rod 34 for on-site installation, avoiding on-site assembly of the expansion joint, improving on-site construction efficiency and the installation positioning accuracy of the new expansion joint structure 14.

[0053] The load-bearing frame 37 is provided with end-turning frames 38 at both ends. Both the load-bearing frame 37 and the end-turning frames 38 are provided with stiffening plates 39, which facilitates vehicles to drive from the bridge deck onto the load-bearing frame 37 during maintenance, reducing the impact of construction activities on existing traffic.

[0054] The movable pulley 310 is equipped with a hydraulic jack. By adjusting the height of the hydraulic jack, the temporary installation stabilizing hanger can switch between being supported by the movable pulley 310 and the rigid support leg 311. When hoisting the new expansion joint structure 14, it is supported by the movable pulley 310. After the new expansion joint structure 14 is installed in place, it is supported by the rigid support leg 311.

[0055] The casting formwork system includes an end formwork 41, a movable side formwork 45, and a fixed angle steel 46. The end formwork 41 is tightly attached to the end of the main beam 11, and the movable side formwork 45 is tightly attached to both sides of the main beam 11. The movable side formwork 45 is connected and fixed to the end formwork 41 by the fixed angle steel 46.

[0056] The end template 41 consists of two pieces as a set, with a telescopic support rod 42 between the two end templates 41. The end template 41 is provided with a telescopic support foot 43 and a support pulley 44 below it. The support pulley 44 is supported on the cap beam 12. The telescopic support rod 42 and the telescopic support foot 43 are threaded rods or hydraulic rods. By setting the telescopic support rod 42 and the telescopic support foot 43, the end template 41 can be quickly erected and dismantled at the ends of the two main beams 11, reducing the difficulty of operation and ensuring the quality of concrete molding.

[0057] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A construction method for quickly replacing bridge expansion joints during highway reconstruction and expansion with alternating traffic on half of the road, characterized in that, The construction steps include the following: Step 1: The saw blade of the cutting machine in the enclosed cutting guide device passes through the strip protective box to cut the seams on both sides of the original expansion joint structure; then the original expansion joint structure is removed. Step 2: Install the casting formwork system, attach the two end formwork pieces to the ends of the main beams on both sides, and use fixed angle steel to fix the movable side formwork to the side of the main beams; Step 3: Set up a temporary installation stabilizing hanger. The hanger is fixed to the steel beam of the new expansion joint structure through the lower end of the hanger rod. Move the temporary installation stabilizing hanger to the installation position. Step 4: Pour steel fiber reinforced concrete at the ends of the main beam, temporarily install stabilizing hangers and cure them by spraying water through sprinkler pipes, and set up a load-bearing frame on top of the temporary stabilizing hangers for vehicles to pass through; Step 5: Remove the hangers, move the temporary installation stabilizing hangers out, and then pull the casting formwork system out entirely between the two main beams.

2. The construction method for rapid replacement of bridge expansion joints during highway reconstruction and expansion with alternating half-width traffic, as described in claim 1, is characterized in that... In step one, the enclosed cutting guide device includes a cutting machine, a trolley, and a strip protective box. The cutting machine is fixed on the trolley, and the strip protective box is installed on one side of the trolley via a limiting telescopic rod. The strip protective box has a water inlet and a water outlet, and it encloses the cutting surface. First, the cutting line is laid out on the main beams at both ends of the expansion joint. The strip protective box is then lowered from the trolley. Next, the saw blade of the cutting machine is passed through the strip protective box and aligned with the cutting line. The cooling water inlet pipe is connected to the water inlet, and the water outlet pipe is connected to the water outlet. The water pump and water pump are started first, and then the cutting machine is started to cut along the cutting line.

3. The construction method for rapid replacement of bridge expansion joints during highway reconstruction and expansion with alternating half-width traffic, as described in claim 2, is characterized in that... The bottom of the strip-shaped protective box is equipped with a rubber strip, and the top is equipped with a rubber sheet. The rubber sheet has strip-shaped openings, through which the saw blade cuts the main beam. The sides of the strip-shaped protective box are equipped with counterweights to ensure that the strip-shaped protective box fits against the surface of the main beam during movement.

4. The construction method for rapid replacement of bridge expansion joints during highway reconstruction and expansion with alternating half-width traffic, as described in claim 1, is characterized in that... The casting formwork system includes end formwork, movable side formwork, and fixed angle steel. The end formwork consists of two pieces as a set, with a telescopic strut between the two end formwork pieces. The end formwork is equipped with telescopic feet and supporting pulleys at the bottom. The supporting pulleys are supported on the cap beam. The telescopic struts and telescopic feet are threaded or hydraulic rods. The height of the telescopic feet is adjusted to adjust the end formwork to a reasonable elevation. Then, the length of the telescopic struts is adjusted so that the end formwork fits against the inner ends of the main beam. The movable side formwork fits against both sides of the main beam. The movable side formwork is connected and fixed to the end formwork by fixed angle steel.

5. The construction method for rapid replacement of bridge expansion joints during highway reconstruction and expansion with alternating half-width traffic, as described in claim 4, is characterized in that... The temporary installation stabilizing bracket includes a suspension frame, a front telescopic bracket, a sprinkler pipe, a load-bearing frame, movable pulleys, and rigid support legs. The movable pulleys and rigid support legs are installed below the suspension frame, the load-bearing frame is fixed above the suspension frame, and the sprinkler pipe is set between the load-bearing frame and the suspension frame. The sprinkler pipe is equipped with atomizing nozzles at intervals. The front telescopic bracket extends and retracts outside the suspension frame. The suspension frame is equipped with a movable sleeve, and a hanging rod is installed below the movable sleeve. In step three, the position of the movable sleeve on the suspension frame is adjusted according to the distance between the steel beams of the new expansion joint structure, so that the hanging rod is aligned with and fixed to the steel beams of the new expansion joint structure.

6. The construction method for rapid replacement of bridge expansion joints during highway reconstruction and expansion with alternating half-width traffic, as described in claim 5, is characterized in that... The movable pulley is equipped with a hydraulic jack. By adjusting the height of the hydraulic jack, the temporary installation stabilizing hanger can switch between movable pulley support and rigid support. When hoisting the new expansion joint structure, it is supported by the movable pulley, and after the new expansion joint structure is installed in place, it is supported by the rigid support.

7. The construction method for rapid replacement of bridge expansion joints during highway reconstruction and expansion with alternating half-width traffic, as described in claim 5, is characterized in that... The load-bearing frame is equipped with end-turning frames at both ends. Both the load-bearing frame and the end-turning frames are equipped with stiffening plates. When the end-turning frames are opened, they are supported on the surface of the main beam. The load-bearing frame and the end-turning frames form a trapezoidal structure, allowing vehicles to pass over the main beam.

8. The construction method for rapid replacement of bridge expansion joints during highway reconstruction and expansion with alternating half-width traffic, as described in claim 6, is characterized in that... Step five is as follows: First, remove the hanger rod, raise the hydraulic jack on the movable pulley, and use the movable pulley to support the temporary installation stabilizing hanger. Then, remove the fixed angle steel and movable side formwork, adjust the telescopic support rod and telescopic support foot to separate the end formwork from the end of the main beam, and then pull the end formwork out as a whole between the two main beams.

9. The construction method for rapid replacement of bridge expansion joints during highway reconstruction and expansion with alternating half-width traffic, as described in claim 1, is characterized in that... First, replace the original expansion joint structure of half of the bridge deck. After completing step five, repeat steps one to five to replace the original expansion joint structure of the other half of the road surface.

10. A rapid replacement bridge expansion joint system for alternating half-width traffic during highway reconstruction and expansion, characterized in that... Obtained by the method described in any one of claims 1 to 9.

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