A method for handling the beam body void at the railway continuous beam support

Abstract

The present application belongs to the technical field of pull rod machine, and discloses a railway continuous beam support beam body void treatment method, which comprises the following steps: installation and construction of hydraulic jack for jacking the beam body, installation of jacking system, pre-jacking the beam body, formal jacking of the beam body, taking out the support, removing loose concrete aggregates on the beam body, beam body cavity sealing, grouting treatment on the sealed cavity, hole sealing, bottom polishing treatment of the beam body, replacement of the upper seat plate of the support and installation of the support, beam falling and support elevation review. The present application is simple and easy to implement, effectively solves the continuous beam support void problem and ensures the quality of support defect treatment.

Description

Technical Field

[0001] This invention belongs to the field of construction technology for the treatment of beam defects at continuous beam supports. It provides a simple and effective method for dealing with beam defects at continuous beam supports in railways, which solves the problem of beams becoming detached from their supports and ensures the quality of support defect treatment. Background Technology

[0002] With social development, more and more bridge projects are being put into use, and problems such as bridge defects are becoming increasingly prominent. Roads are the lifeblood of local economies, and the treatment of bridge defects needs to be completed while ensuring normal operation. Bearings are important components connecting the upper and lower structures of a bridge. Problems with the bearing system can cause fatal issues such as beam damage and pier damage. In particular, gaps in the beam at the bearing and insufficient concrete compaction can lead to uneven stress on the bearing, causing concentrated stress on the gapped bearing or other bearings to share excess stress. This results in deviation of the bearing stress and the support point of the beam, creating a continuous adverse stress state for both the bearing and the beam, which will affect the normal use of the bridge. If not rectified in time, it may lead to a major accident.

[0003] Currently, the method for repairing beam defects at supports involves direct cement mortar injection, which easily leads to subsequent voids and poor treatment results. Therefore, the industry urgently needs an effective construction solution for repairing voids in beams at supports. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a simple, easy-to-implement, and effective method for addressing the problem of beam voids at the supports of continuous beams and ensuring the quality of support defect rectification. To achieve the above objective, this invention provides the following technical solution:

[0005] This invention provides a method for handling the voiding of the beam at the support of a railway continuous beam, comprising the following steps:

[0006] The first step involves the installation of the hydraulic jacks used to lift the beam and the installation of the lifting system.

[0007] Hydraulic jacks are arranged transversely on both sides of the support, and the number of hydraulic jacks is determined to meet the lifting requirements. According to the beam load and the stress characteristics of the bridge, the hydraulic jacks are arranged inside the beam end pad stone and as close as possible to the original support, while reserving the space required to remove and install the support.

[0008] The lifting system includes a hydraulic pump station, cylinders, and a sensor detection system controlled by a computer control system, and is located on top of the bridge pier.

[0009] The second step is to pre-lift the beam.

[0010] The pre-lifting is based on the beam being lifted by 2mm, and this pre-lifting is carried out in two steps.

[0011] ① The jacking system is mainly controlled by jacking force. When the jacking reaches 50% of the total weight of the beam and ballastless track, hold the load for 5 to 10 minutes to check the safety of the jacking equipment. If there are no abnormalities, the jacks will be lowered back to their original positions.

[0012] ② The jacking system is mainly controlled by jacking displacement. The beam should be jacked up to 1-2mm away from the support. Check the separation of all supports from the beam. At the same time, measure the total weight of the beam and the reaction force of each support. After the test, quickly lower the jack back to the original position. The time spent in this stage should not exceed 5 minutes.

[0013] The third step is to formally lift the beam.

[0014] If there are no problems after the pre-lifting of the beam, the formal lifting of the beam can proceed. The formal lifting of the beam must be slow and stable. The beam should be loaded with the preset load and lifted according to the lifting operation steps.

[0015] Step four: Remove the support.

[0016] Once the beam has been lifted to the required height, it is leveled using the lifting system. The lifting system is then shut off, and the jacks are locked in a pressure-holding state. The bolts on the upper and lower bearing plates are then removed, and the bearing is taken out.

[0017] The fifth step is to remove any loose concrete aggregate from the beam.

[0018] Clean the defective parts of the beam, and remove the loose and honeycomb concrete around the local defects or voids until the exposed concrete is firm and dense.

[0019] Step 6: Seal the voids in the beam.

[0020] Two-component modified epoxy resin structural sealant, A and B, are mixed in a 2:1 ratio. After being stirred evenly, the sealant is manually applied along the edge of the cavity in the beam using a steel trowel until it is completely sealed.

[0021] Before the cavity is sealed, transparent flexible tubes for grouting and venting are pre-embedded in the cavity. Two transparent flexible tubes are installed on each side of the support installation position. The top ends of the two transparent flexible tubes are located in the inner cavity formed by the cavity, and the bottom ends of the two transparent flexible tubes are located outside the sealed cavity. The top ends of the two transparent flexible tubes are located at the highest point of the cavity. One transparent flexible tube is used for grouting, and the other transparent flexible tube is used for venting.

[0022] The seventh step is to grout the sealed cavity.

[0023] Two-component modified epoxy resin structural grouting adhesive, A and B, are mixed in a 2:1 ratio. After being stirred evenly, the grouting machine is used to inject grout into the sealed cavity through the transparent hoses used for grouting until grout overflows from each transparent hose used for venting.

[0024] Step 8: Seal the holes.

[0025] After the injected grout has solidified, cut off the exposed part of the transparent tube with a handheld cutter, and then fill it tightly with epoxy resin sealant.

[0026] Step nine: Grinding the bottom of the beam.

[0027] After the strength reaches the design compressive strength, the grouting area at the bottom of the beam is ground until the surface is smooth;

[0028] Step 10: Replace the upper bearing plate of the support and install the support.

[0029] Replace the original upper bearing plate with the standard part on the support. During installation, ensure that the support is level, that the plane of the support is level in both the longitudinal and transverse directions, and that it meets the design elevation requirements. Use a spirit level to adjust and verify. During installation, the center line of the support along the bridge must coincide with or be parallel to the center of the main beam.

[0030] Step 11, lowering the beam.

[0031] After the supports are adjusted and checked to be correct, all hydraulic jacks are lowered simultaneously. After the weight of the beam is transferred to the supports, the distance between the marked point and the top of the pier is the same as before the lifting. After the beam is lowered, it must be ensured that the gap around the supports does not exceed 0.3mm.

[0032] Step 12: Verify the support elevation.

[0033] After the beam is lowered, the original elevation data is re-measured; the installation height of the supports is measured, and after the design requirements are met, the hydraulic jacks and all auxiliary facilities are removed, and the deviation of the centerline position of the supports meets the design specifications.

[0034] The beneficial effects of this invention are:

[0035] (1) The grouting method is simple and efficient, and the grouting fullness of the voided and non-dense parts is high, so the grouting quality is effectively guaranteed.

[0036] (2) Compared with traditional grouting materials, this grouting material has a higher compressive strength than concrete, good adhesion to concrete and steel bars, and strong fluidity during the grouting process, which can fill small cavities and non-dense parts, ensuring the filling effect and solid quality.

[0037] (3) This method is simple and easy to implement, effectively solves the problem of continuous beam support detachment and ensures the quality of support defect treatment.

[0038] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0040] Figure 1 This is a schematic diagram of the hydraulic jacks of the present invention arranged on the bridge pier;

[0041] Figure 2 This is a schematic diagram of the structure of the present invention in another direction;

[0042] Figure 3 This is a schematic diagram of the grouting section of the present invention.

[0043] Reference numerals: 1. Beam; 2. Hydraulic jack; 3. Support; 4. Transparent flexible hose; 5. Pier; 6. Wire-type displacement sensor. Detailed Implementation

[0044] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0045] like Figure 1-3 As shown, the present invention provides a method for handling beam detachment at the support of a railway continuous beam, comprising the following steps:

[0046] The first step involves the installation of the hydraulic jacks 2 used to lift beam 1 and the installation of the lifting system.

[0047] Hydraulic jacks 2 are arranged transversely on both sides of the support 3. The number of hydraulic jacks 2 is determined to meet the lifting requirements. According to the load of beam 1 and the stress characteristics of the bridge, the hydraulic jacks 2 are arranged inside the end pad stone of the beam and as close as possible to the original support, while reserving the space required to remove and install the support.

[0048] The lifting system includes a hydraulic pump station, cylinders and a sensor detection system controlled by a computer control system, and is located on top of the pier (5);

[0049] The second step is to pre-lift beam 1.

[0050] The pre-lifting is based on lifting beam 1 by 2mm, and the pre-lifting is carried out in two steps.

[0051] ① The jacking system is mainly controlled by jacking force. When the jacking reaches 50% of the total weight of the beam 1 and the ballastless track, hold the load for 5 to 10 minutes to check the safety of the jacking equipment. If there are no abnormalities, the jacks will be lowered back to their original positions.

[0052] ② The jacking system is mainly controlled by jacking displacement. The beam should be jacked up to 1-2mm away from the support. Check the separation of all supports from the beam. At the same time, measure the total weight of the beam and the reaction force of each support. After the test, quickly lower the jack back to the original position. The time spent in this stage should not exceed 5 minutes.

[0053] The third step is to formally lift beam 1.

[0054] After the pre-lifting of beam 1, if there are no problems, the formal lifting of beam 1 can proceed. The formal lifting of beam 1 should be slow and stable. The formal lifting of beam 1 should be carried out by loading the preset load and following the lifting operation steps.

[0055] Step 4: Remove support 3.

[0056] After the beam 1 is lifted to the required height, it is leveled by the lifting system, the lifting system is turned off, the jacks are self-locked and in pressure-holding state, and then the bolts on the upper and lower plates of the support 3 are removed and the support 3 is taken out.

[0057] The fifth step is to remove the loose concrete aggregate from beam 1.

[0058] Clean the defective parts of beam 1, and remove loose and honeycomb concrete along the perimeter of the local defects or voids until the exposed concrete is firm and dense.

[0059] Step 6: Seal the cavity in beam 1.

[0060] Two-component modified epoxy resin structural sealant, adhesive A and adhesive B, are mixed in a 2:1 ratio. After being stirred evenly, the sealant is manually applied along the edge of the cavity in beam 1 using a steel trowel until it is completely sealed.

[0061] Before the cavity is sealed, transparent hoses 4 for grouting and venting are pre-embedded in the cavity. Two transparent hoses 4 are installed on each side of the installation position of the support 3. The top ends of the two transparent hoses 4 are located in the inner cavity formed by the cavity, and the bottom ends of the two transparent hoses 4 are located outside the sealed cavity. The top ends of the two transparent hoses 4 are located at the highest point of the cavity. One transparent hose 4 is used for grouting, and the other transparent hose 4 is used for venting.

[0062] The seventh step is to grout the sealed cavity.

[0063] Two-component modified epoxy resin structural injection adhesive A and B are mixed in a ratio of 2:1. After being stirred evenly, the sealed cavity is injected through the transparent hose 4 used for grouting using a grouting machine until the grout overflows from each of the transparent hose 4 used for venting.

[0064] Step 8: Seal the holes.

[0065] After the injected grout has solidified, cut off the exposed part of the transparent tube 4 with a handheld cutter, and then fill it tightly with epoxy resin sealant.

[0066] Step 9: Grinding the bottom of beam 1.

[0067] After the strength reaches the design compressive strength, the grouting area at the bottom of the beam is ground until the surface is smooth;

[0068] Step 10: Replace the upper plate of support 3 and install support 3.

[0069] Replace the original upper bearing plate standard parts onto bearing 3. During installation, ensure that bearing 3 is level, that the bearing plane is level in both the longitudinal and transverse directions, and that it meets the design elevation requirements. Use a spirit level to adjust and verify. During installation, the center line of bearing 3 along the bridge must coincide with or be parallel to the center of the main beam.

[0070] Step 11, lowering the beam.

[0071] After the support 3 is adjusted and checked to be correct, all hydraulic jacks 2 are lowered simultaneously. After the weight of the beam 1 is transferred to the support 3, the distance between the mark point and the top of the pier 5 is the same as before the lifting. After the beam is lowered, it must be ensured that the gap around the support 3 does not exceed 0.3mm.

[0072] Step 12: Verify the elevation of support 3.

[0073] After the beam was lowered, the original elevation data was re-measured; the installation height of support 3 was measured, and after meeting the design requirements, hydraulic jack 2 and all auxiliary facilities were removed. The centerline position deviation of support 3 met the design specifications. In this embodiment, the method is simple and easy to implement, effectively solving the problem of continuous beam support voids and ensuring the quality of support defect treatment. Specifically, the grouting method is simple and efficient, with high grout fullness in the voided and non-dense areas, effectively ensuring grouting quality. Compared with traditional grouting materials, this grouting material has a higher compressive strength than concrete, good adhesion to concrete and reinforcing steel, and strong fluidity during grouting, which can fill small cavities and non-dense areas, ensuring filling effect and solid quality.

[0074] To ensure the accuracy of jacking control and subsequent verification and labeling, in the above embodiment, preferably: in the first step, the hydraulic jacks 2 located on both sides of the pier 5 are each an independent group, and the jacking height of each group is detected by a wire displacement sensor 6, which is set between the pier 5 and the beam 1.

[0075] To ensure the orderly and stable lifting process, in the above embodiments, preferably, the third step of the lifting operation includes the following steps:

[0076] ① Carefully inspect the working condition of the overall lifting system, including the hydraulic cylinders, hydraulic pump station, computer control system, and related auxiliary tools such as sensor detection system;

[0077] ② Based on the results of weighing and trial lifting, set the pressure values ​​at the jacks of each specialty;

[0078] ③ The computer sets the lifting speed (1mm / min) and the command displacement. The command displacement is automatically and evenly applied until the maximum set displacement command is reached.

[0079] ④ The lifting process is divided into at least three stages, and the lifting is completed to the expected height.

[0080] ⑤ Once the pump is lifted to the designated height, the hydraulic pump station maintains pressure, collects various data, and automatically locks the oil pressure at each point to maintain a constant pressure.

[0081] To ensure the stability of the lifting process, in the above embodiment, preferably, in step ④, the expected lifting height is 5mm, and the entire lifting process is divided into three stages, with lifting heights of 1mm, 2mm and 2mm respectively.

[0082] To avoid thin-edge repairs and ensure repair quality, in the above embodiments, preferably, in the fifth step, when removing loose concrete aggregate on the beam (1), the repair boundary is chiseled into a right angle.

[0083] To ensure the quality of cavity filling, in the above embodiment, preferably, in the sixth step, the diameter of the transparent flexible tube 4 is 1cm, and it extends 30cm outside the closed cavity.

[0084] To facilitate the connection between new and old concrete, in the above embodiments, preferably: in the seventh step, after the loose concrete and voids are cleaned, an air compressor is used to blow and wash the repaired part of the beam 1 clean, keep it dry, and then apply a layer of interface agent.

[0085] To ensure subsequent use, in the above embodiments, preferably, in the seventh step, when the grouting construction is completed, the mixing tank must be rinsed with clean water. At this time, the hydraulic pump continues to work as usual, so that water is discharged from the high-pressure pipe through the pipeline and the grouting pump, and the residual grout in each component is thoroughly removed and rinsed clean.

[0086] To meet design requirements, in the above embodiments, preferably, in step 10, when the support 3 is installed, the height difference between its four corners is controlled within 2mm.

[0087] In the above embodiments, the technical processes not described or detailed are conventional technical processes in the art.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for handling beam detachment at the support of a railway continuous beam, characterized in that: Includes the following steps: The first step is to install the hydraulic jacks (2) used to lift the beam (1) and the lifting system. The hydraulic jacks (2) are arranged transversely on both sides of the support (3). The number of hydraulic jacks (2) is set to meet the lifting needs. According to the load of the beam (1) and the stress characteristics of the bridge, the hydraulic jacks (2) are arranged inside the end pad stone of the beam and as close as possible to the original support, while reserving the space required to remove the support. The lifting system includes a hydraulic pump station, oil cylinder and sensor detection system controlled by a computer control system. The lifting system is located on the top of the pier (5). The hydraulic jacks (2) on both sides of the pier (5) are each an independent group. The lifting height of each group is detected by a pull-wire displacement sensor (6). The pull-wire displacement sensor (6) is set between the pier (5) and the beam (1). The second step is to pre-lift the beam (1). The pre-lifting is based on lifting the beam (1) by 2mm. The pre-lifting is carried out in two steps: ① The lifting system is mainly controlled by the lifting force. Lift the beam (1) to 50% of the total weight of the ballastless track. Hold the load for 5-10 minutes to check the safety of the lifting equipment. After there is no abnormality, the jacks are lowered back to their original positions. ② The lifting system is mainly controlled by the lifting displacement. Lift the beam (1) to 1-2mm away from the support (3). Check the separation of all supports (3) from the beam (1). At the same time, measure the total weight of the beam (1) and the reaction force of each support. After the test, quickly lower the jacks back to their original positions. The time spent in this stage should not exceed 5 minutes. The third step is to formally lift the beam (1). After the pre-lifting of the beam (1), if there are no problems, the formal lifting of the beam (1) will be carried out. The formal lifting of the beam (1) will be carried out according to the preset load and the lifting operation steps will be carried out. The lifting operation steps include the following steps: ① Check the working condition of the overall lifting system, including the oil cylinder, hydraulic pump station, computer control system and sensor detection system; ② Set the pressure value at each hydraulic jack (2) according to the weighing and trial lifting results; ③ Set the lifting speed and command displacement of the computer to 1mm / min. The command displacement will be automatically and evenly loaded until the maximum displacement command is set; ④ Lift to the expected height of 5mm. The entire lifting process is divided into three stages, with the lifting heights being 1mm, 2mm and 2mm respectively; ⑤ When the lifting reaches the specified height, the hydraulic pump station will maintain pressure, collect various data, and the oil pressure at each point will be automatically locked and kept constant. Fourth step, remove the support (3). After the beam (1) is lifted to the required height, level it through the lifting system, close the lifting system, and make the jack self-locking in the pressure holding state. Then remove the bolts on the upper and lower plates of the support (3) and remove the support (3). The fifth step is to remove the loose concrete aggregate on the beam (1), clean the defective parts of the beam (1), and remove the loose and honeycomb concrete along the perimeter of the local defects or voids until the exposed concrete is firm and dense. When removing the loose concrete aggregate on the beam (1), repair the boundary and chisel it into a right angle. Step 6: Seal the void in beam (1). Before sealing the cavity in the beam (1), after cleaning the loose concrete and the cavity, the repaired part of the beam (1) is cleaned by air compressor and kept dry. Then, a layer of interface agent is applied. Two-component modified epoxy resin structural sealant A and B are mixed in a ratio of 2:

1. After stirring evenly, the cavity is sealed gradually along the edge of the cavity in the beam (1) by manual use of steel trowel until it is completely sealed. Before sealing the cavity, transparent hoses (4) for grouting and venting are pre-embedded in the cavity. Two transparent hoses (4) are set at each side of the installation position of the support (3). The top of the two transparent hoses (4) is located in the cavity formed by the cavity, and the bottom of the two transparent hoses (4) is located outside the cavity after sealing. The top of the two transparent hoses (4) is located at the highest point of the cavity. One transparent hose (4) is used for grouting, and the other transparent hose (4) is used for venting. The diameter of the transparent hose (4) is 1cm, and it extends 30cm outside the sealed cavity. Step 7: Grouting treatment is carried out on the sealed cavity. The two-component modified epoxy resin structural injection adhesive A and B are mixed in a ratio of 2:

1. After the mixture is evenly stirred, the grouting machine is used to inject grout into the sealed cavity through the transparent hose (4) used for grouting until the grout overflows from each transparent hose (4) used for venting. Step 8: Sealing the hole. After the injected grout has solidified, cut off the exposed part of the transparent tube (4) with a handheld cutter and then fill it tightly with epoxy resin sealant. Step 9: Grinding treatment of the bottom of the beam (1). After the strength reaches the design compressive strength, the grouting area at the bottom of the beam is ground until the surface is flat. Step 10: Replace the upper bearing plate of the support (3) and install the support (3). Replace the original upper bearing plate standard part on the support (3). During installation, ensure that the support (3) is horizontal, and ensure that the plane of the support is horizontal in both longitudinal and transverse directions and meets the design elevation requirements. Use a spirit level to adjust and check. During installation, the support (3) along the bridge center line must coincide with or be parallel to the center of the main beam. When the support (3) is installed, the height difference of its four corners should be controlled within 2mm. Step 11: Lowering the beam. After adjusting the support (3) and checking that it is correct, all hydraulic jacks (2) are lowered simultaneously. After the weight of the beam (1) is transferred to the support (3), the distance between the mark point and the top of the pier (5) is consistent with that before the lifting. After lowering the beam, ensure that the gap around the support (3) does not exceed 0.3mm. Step 12: Verify the elevation of support (3). After the beam is lowered, remeasure the original elevation data; measure the installation height of support (3). After the design requirements are met, remove the hydraulic jack (2) and all auxiliary facilities. The deviation of the centerline position of support (3) meets the design specifications.

2. The method for handling beam detachment at the support of a railway continuous beam according to claim 1, characterized in that: In the seventh step, when the grouting work is completed, the mixing tank must be rinsed with clean water. At this time, the hydraulic pump continues to work as usual, so that water is discharged from the high-pressure pipe through the pipeline and the grouting pump to thoroughly remove and clean the residual grout from each component.

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