CN113338176A

CN113338176A - Method for repairing hinge joint of uninterrupted traffic hollow slab bridge

Info

Publication number: CN113338176A
Application number: CN202110622016.6A
Authority: CN
Inventors: 杨斌
Original assignee: Shanghai Chenghai Bridge And Tunnel Engineering Group Co ltd
Current assignee: Shanghai Chenghai Bridge And Tunnel Engineering Group Co ltd
Priority date: 2021-06-03
Filing date: 2021-06-03
Publication date: 2021-09-03

Abstract

The invention provides a method for repairing a hinge joint of a hollow slab bridge without interrupting traffic, and relates to the technical field of bridge hinge joint repair. The method for repairing the hinge joint of the uninterrupted traffic hollow slab bridge mainly comprises the following steps: clamping the end part of the slab joint by using battens, connecting the bottom of the slab joint with the top of the slab joint to seal the beam end, arranging a glue injection pipe and an observation pipe in a pairing manner every 1.5-2 m between the battens at the two ends, and then sealing the bottom of the slab joint; and (5) performing one-time glue injection and full injection curing on the plate seams of 0-3 mm through the glue injection pipe. The method has the advantages of short construction period, no need of traffic interruption, no vehicle congestion, no influence on the original structure of the bridge, less manpower and material resources consumption and better economy.

Description

Method for repairing hinge joint of uninterrupted traffic hollow slab bridge

Technical Field

The invention relates to the technical field of bridge hinge joint repair, in particular to a method for repairing a hinge joint of an uninterrupted traffic hollow slab bridge.

Background

The transverse distribution of load is realized by transferring shearing force between the concrete precast hollow plates through the hinge joints, and the transverse connection action of the hinge joints and the bridge deck pavement enables the plurality of hollow plates to jointly bear external load as a whole. Under the effect of ever-increasing traffic volume and transfinite transportation, the hinge joint has damage failure, once the hinge joint is damaged, the transverse distribution and the integral stress performance of the bridge are seriously influenced, even an unfavorable single-plate stress state is formed, so that the deflection of the plate is overlarge, the bottom of the plate is cracked, the pavement of the bridge deck is damaged, and the damage of steel bar corrosion, concrete corrosion, strength reduction and the like in the plate girder is caused due to the infiltration of rainwater, thereby forming serious hidden danger to the driving safety. Along with the rapid development of national economy, traffic pressure is multiplied, and the bearing capacity of a highway bridge is insufficient, so that the road bridge is difficult to maintain in time while the damage is aggravated, and traffic is mostly required to be interrupted during maintenance, and the traffic jam is easy to cause. How to repair and reinforce the hinge joint damage under the condition of not meeting road traffic or reducing traffic interruption as much as possible is a technical difficulty.

Disclosure of Invention

The invention aims to provide a method for repairing a hinge joint of an uninterrupted traffic hollow slab bridge, which has the advantages of short construction period, no need of traffic interruption, no vehicle congestion, no influence on the original structure of the bridge, less manpower and material resources consumption and better economy.

The technical problem to be solved by the invention is realized by adopting the following technical scheme.

The invention provides a method for repairing a hinge joint of an uninterrupted traffic hollow slab bridge, which comprises the following steps: clamping the end part of the slab joint by using battens, connecting the bottom of the slab joint with the top of the slab joint to seal the beam end, arranging a glue injection pipe and an observation pipe in a pairing manner every 1.5-2 m between the battens at the two ends, and then sealing the bottom of the slab joint; and (5) performing one-time glue injection and full injection curing on the plate seams of 0-3 mm through the glue injection pipe.

The method for repairing the hinge joint of the uninterrupted traffic hollow slab bridge provided by the embodiment of the invention at least has the following beneficial effects:

the hinge joint of the hollow slab bridge is weak, the main defects are serious water seepage, the concrete corrosion of the beam slab is serious, and finally, the single slab is stressed, so that the safety of the bridge is damaged. Aiming at the problem that road traffic is not interrupted or interrupted as much as possible when the hinge joint of the hollow slab bridge is repaired, the invention provides a method for reinforcing the hinge joint by pouring sealant. According to the construction method for reinforcing the hinge joint, the hinge joint is formed into a closed cavity, an inlet and an outlet are reserved in a controlled manner, pressure grouting equipment is effectively used, pouring sealant is sequentially poured into gaps of the damaged hinge joint and the slab joint from the bottom of the bridge in stages and areas, after the pouring sealant is cured, the bonding between concrete on two sides can be recovered, and further the integrity of the bridge structure is effectively recovered. The sealing beam end can prevent pouring sealant from flowing out of two ends of the slab joint, the glue injection pipe and the observation pipe are arranged in a matched mode every 1.5-2 m, the slab joint is divided into a plurality of areas along the length direction of the slab joint, the pouring sealant can be poured in sequence during glue injection, the operability of glue injection operation in time is guaranteed, meanwhile, the pouring sealant is enabled to be distributed more uniformly among the slab joint, and the glue injection effect is prevented from being influenced by bubbles. And a plurality of observation pipes are always communicated with the outside atmosphere in the process of injecting glue once, so that the difference between the inside atmospheric pressure and the outside atmospheric pressure is small, the pressure of injecting glue is reduced, and the safety of construction is improved. The pressure glue injection reinforcing method can enhance the load transfer capacity and the waterproof function, and improve the integrity and the durability. The method has the advantages of convenient construction process, short construction period, no need of traffic interruption, no vehicle congestion, no influence on the original structure of the bridge, less manpower and material resources consumption, better economy and the like.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.

The invention provides a method for repairing a hinge joint of an uninterrupted traffic hollow slab bridge, which comprises the following steps: firstly, the number, the length and the width of the plate seams are verified on site, the plate seams needing to be repaired and sealed can be marked by using marked lines with different colors, the conditions of the plate seams (such as the width, the depth and the like of the plate seams) can be roughly predicted according to the different colors, and the preparation of corresponding repairing materials and the subsequent operation of constructors are facilitated. According to the damage condition of the hinge joint, tools such as a scraper knife and a chisel are used for cleaning the slab joint and/or the hinge joint concrete, concrete with the shapes of peeling, loosening, honeycombing, corrosion and the like on the surfaces of the web plate and the bottom plate is removed, a concrete structure surface is exposed, and a high-pressure water gun is used for washing to ensure that no attachments such as oil stain, grease, wax, dust and the like exist in the slab joint and the hinge joint, so that the pouring sealant can be tightly bonded with the interface (the slab joint and the hinge joint), the bonding strength of the pouring sealant is improved, and the glue injection effect is prevented from being influenced. During cleaning, the bottom surface of the hollow plate can be polished by an electric polishing tool to increase friction factors, so that the adhesive force between the pouring sealant and the interface is increased. It should be noted that subsequent operations can be performed only after the flushed plate joint and hinge joint are dried by clean compressed air, so that the mechanical adhesion between the pouring sealant and the interface is prevented from being reduced by moisture, and even the crack repairing work is failed.

Then, in the place (two ends of the slab joint) close to the end part of the abutment, the batten is nailed into the slab joint and the bottom of the batten is guaranteed to be connected with the top of the slab joint so as to seal the beam end, so that the pouring sealant is prevented from flowing out from the two ends of the slab joint during the later-stage glue injection. In order to ensure the air tightness and facilitate the arrangement of the wood strips, the size of the wood strips is slightly larger than that of the plate seams. Preferably, 3-4 wood strips are nailed into the end part of the same side of the board seam, the interval between the adjacent wood strips is 2-4 cm, and the pores between the wood strips are filled with the foam plugging agent. Many battens interval certain distance sets up and cooperate the use of foam plugging agent, can further prevent that the injecting glue in-process pouring sealant from oozing from the both ends of slab joint. The foam plugging agent can be foamed immediately, gaps among the battens can be filled after expansion, solidification and hardening can be realized within 2 minutes, plate seams are plugged quickly, and sealing performance is guaranteed. In addition, the foam plugging agent has good compressibility, can adapt to micro vibration of the space core plate when a vehicle passes through, and can avoid gaps caused by loosening of battens from plate joints.

And arranging glue injection pipes and observation pipes in a matched mode every 1.5-2 m between the wood strips at the two ends of the plate joint, namely arranging one observation pipe beside one glue injection pipe, and then sealing the bottom of the plate joint. The distance setting of 1.5-2 meters is convenient for cut apart into a plurality of regions with the board seam, and the regional go on during the injecting glue for the pouring sealant can spread rapidly, and permeate to every corner of board seam, improves the shear resistance of hinge joint. Moreover, the observation pipes are communicated with the outside atmosphere in the process of one-time glue injection, so that the atmospheric pressure difference between the inside and the outside of the plate joint is small (only the observation pipes are communicated with the outside after the plate joint is sealed), and compared with a single observation pipe, the arrangement of the plurality of observation pipes can reduce the glue injection pressure and increase the construction safety. In detail, the observation pipe and the glue injection pipe are spaced by 3-5 cm, the height of the top surface of the glue injection pipe is 2-3 cm higher than that of the observation pipe, the height difference enables the pouring sealant to slowly flow into the bottom end of the glue injection pipe from the top of the glue injection pipe to fill the slab joints, bubble generation can be avoided to affect the glue injection effect, and meanwhile the pouring sealant flowing out of the observation pipe can help constructors to master the filling condition of the pouring sealant on the slab joints.

The bottom sealing step adopts sealant to fill the slab joints, and the sealant adopts MS sealant in the invention to adapt to the vibration caused when the vehicle passes through the bridge deck in the repairing process. The MS sealant has good durability and deformation displacement resistance of silicone sealant, good cohesiveness, paintability and low stain property of polyurethane sealant, and good cohesiveness to most base materials. And the MS sealant can absorb and compensate dynamic load so as to achieve the purpose of relieving material fatigue, and is suitable for high-strength and high-modulus permanent elastic sealing and bonding. The preparation method of the MS sealant comprises the following steps: premixing MS resin, white carbon black and graphene for 10-20 minutes, vacuumizing, stirring, heating to l00-110 ℃, and dehydrating for 2 hours. Then, reducing the temperature in the kettle to below 50 ℃, filling nitrogen, adding sodium dodecyl benzene sulfonate, and uniformly mixing under the vacuum condition; and finally, filling nitrogen to relieve the vacuum to normal pressure, and quickly pressing the materials into a plastic packaging tube to obtain the MS sealant. Wherein, the premixing is carried out for 10 to 20 minutes, so that the raw materials can be uniformly dispersed to the maximum extent, and the uniformity of the quality of the finished product is improved. And then reacting the premixed mixture under the conditions, adding sodium dodecyl benzene sulfonate to improve the dispersibility of the graphene, and avoiding the phenomenon that the MS sealant cannot be normally used in actual life due to overlarge quality difference caused by the agglomeration of the graphene in the reaction process. Meanwhile, the sodium dodecyl benzene sulfonate as a surfactant can also improve the wetting performance of the MS sealant on a sealing interface, so that good adhesion can be generated. In the MS sealant provided by the invention, the addition of the graphene can improve the performances of the MS sealant in the aspects of mechanical property, hardness, toughness and the like; the white carbon black is used as a filler, so that the thixotropic property, the ageing resistance, the reinforcement and other effects can be improved, the mechanical property, the permeability and the diffusivity of the sealant can be further improved, and the bonding property of the sealant can be improved.

And tightly attaching the plate joints to the hinge joints by using soft glass pressing strips after the plate joints are sealed, and fixing the steel plate strips on the hollow plate by using expansion screws after the soft glass pressing strips are pressed by the steel plate strips, so that the bottom sealing of the plate joints can be finished. The bottom sealing treatment is carried out on the plate joint, so that the adaptability of the pouring sealant to the interlayer movement of the hollow plate layer can be improved, and the phenomenon that the pouring sealant is leaked due to the fact that the crack occurs on the well-bonded matrix in the construction process is avoided. And a closed cavity required by pressure glue injection can be formed between the back cover and the battens, the pouring sealant is pressed into slab joints from the bottom of the bridge subsequently, and the bonding between the concrete on two sides can be recovered after the pouring sealant is cured, so that the integrity of the bridge structure is effectively recovered. It should be noted that, the edge of the pressing bar and the contact surface of the pressing bar and the glue injection pipe and the overflow pipe should be tightly sealed during the bottom sealing treatment, and the first sealing should be followed by a plurality of inspections and repairs to prevent the glue from leaking.

Furthermore, the distance between the glue injection pipe and the top of the plate seam is 3-5 cm, so that the hinge seam can be well filled, the load is integrated, and the service life of the load is prolonged. And when the distance between the plate seams is larger than 3 cm, filling the plate seams with filling strips, and then filling the plate seams with sealant. The filling strips are adhered between the plate joints, so that the plate joints can be filled, the use of pouring sealant can be reduced, and the construction time is further shortened. In the present invention, the filling bar may be a wood bar, a metal bar, or the like, as long as the filling bar has a certain mechanical strength and plays a role of filling, and is not limited specifically.

And performing primary glue injection after the bottom sealing is finished, wherein the primary pouring sealant comprises the following configuration steps: sequentially adding polyurethane, antioxidant, softening agent, calcium carbonate and white carbon black into the epoxy resin solution, and stirring for 30-40 minutes at the temperature of 150-160 ℃ to obtain the primary pouring sealant. Among them, epoxy resin has excellent adhesive strength, thermal stability and chemical stability, and can be cured at low temperature, so that it is widely used in concrete crack repair engineering. However, epoxy resins have certain disadvantages after curing, such as low tensile strength, poor adhesion in a humid environment, and high brittleness after curing, which limits their applications to some extent. Polyurethane belongs to block copolymer, hard segments (composed of polyisocyanate and corresponding chain extender) and flexible segments (composed of polyester or polyether polyol) are repeatedly and alternately arranged to form polyurethane molecular structural units, the soft segments and the hard segments can form microphase separation, and hydrogen bonds formed in the molecules and among the molecules of the polyurethane promote the physical crosslinking among the polyurethane molecules, so that the polyurethane material is endowed with good toughness and wear resistance. In the invention, the chain segments of the polyurethane are introduced into the epoxy resin network, the two are mutually penetrated to form a full or semi-interpenetrating network polymer structure, the mutually entangled networks inhibit the separation between the two phases, so that the compatibility is increased, the two network phase regions are stable after crosslinking, and the toughness and the mechanical strength of the epoxy resin are improved on the basis of the structural characteristics of the polyurethane. And the antioxidant is added into the polyurethane/epoxy resin matrix, and can play a role in capturing active free radicals and inhibiting the generation of hydroperoxide in the pouring sealant, inhibit the oxidative degradation of macromolecular materials in the pouring sealant, improve the ageing resistance of the pouring sealant and prolong the service life of the bridge. The calcium carbonate and the white carbon black can be used as fillers, so that the viscosity of the primary pouring sealant is changed, the temperature sensitivity of the primary pouring sealant is reduced, the temperature stability of the primary pouring sealant is improved, the influence of external environmental factor changes on the glue injection effect is reduced, and the success rate is improved. In addition, silicon hydroxyl on the surface of the white carbon black can react with an epoxy group, so that the reaction time of a cured product is shortened, and the mechanical property of the cured product is improved. The softener can weaken the acting force among the pouring sealant molecules, so that the molecular chains are easy to slide, the plasticity and the low-temperature performance of the pouring sealant are improved, the viscosity is reduced, and the processing and the using performance of the pouring sealant are improved. Alternatively, the softener may be soybean oil, or an aromatic hydrocarbon-based softener oil. Moreover, the over-high stirring temperature may cause the aging of the potting adhesive, while the low stirring temperature has poor fluidity to be unfavorable for the glue injection, and the potting adhesive is easily damaged after the temperature exceeds the temperature threshold, so the temperature is preferably 150 ℃ and 160 ℃. The polyurethane can react with the epoxy resin, the polyurethane can be added firstly, so that the influence of other substances on the formation of a network polymer structure can be avoided, and the antioxidant has an anti-aging effect, so that the antioxidant performance of the primary pouring sealant can be improved by adding the polyurethane later, and the material fluidity can be reduced by adding the white carbon black and the calcium carbonate, the shearing effect of other materials can be influenced by adding the white carbon black and the calcium carbonate in advance, so that the polyurethane is added after all the materials.

When glue is injected for the first time, a special plate joint pressure pump or a plate joint constant-pressure perfusion unit is adopted to press primary pouring glue into a plate joint through a glue injection pipe, the primary pouring glue flows out from an observation pipe with a lower top surface when the glue is injected to a certain height, and a constructor is reminded that the primary pouring glue among the small sections of plate joints is completely filled and can fill the next section of plate joint. It should be noted that, the pouring of primary potting adhesive should pour from the low end of the slab joint to the high end, press in from the 1 st glue injection pipe of low end, when the primary potting flows out from the 1 st observation pipe, die the 1 st glue injection pipe, carry out the pouring of the 2 nd glue injection pipe again, analogize and pour one by one, when the observation pipe of the head begins to emit the thick liquid, can end a glue injection work. It should be noted that the initial setting time of the primary pouring sealant provided by the invention is about 40 minutes, and the final setting time is about 60 minutes, so that the glue injection time should not exceed 30 minutes each time, and the glue preparation amount should not be too large each time, so as to be capable of completely and uniformly stirring and using up within the operable time. Resource waste caused by the fact that the potting adhesive cannot be used due to solidification is avoided, and the potting adhesive is filled and solidified at one time. Along with the increase of the temperature and the increase of the glue preparation amount, the operable time can be correspondingly shortened. And when the displacement between the plate joints is more than 3 mm or the construction temperature is lower than 15 ℃, secondary glue injection is needed.

The secondary glue injection is pressure glue injection, the glue solution is required to be capable of filling cracks, and the fluidity and the permeability of the glue solution are good. Based on the requirements, the pure glue liquid is adopted for filling during secondary glue injection. In detail, the secondary pouring sealant comprises the following steps: sequentially adding polyurethane, an antioxidant, a diluent and a curing accelerator into the epoxy resin solution, and stirring for 20-30 minutes at the temperature of 140-150 ℃ to obtain the secondary pouring sealant. The epoxy resin and the polyurethane react to generate the adhesive with higher mechanical strength and toughness, and the anti-aging effect and the use durability of the pouring sealant are improved. The diluent can effectively reduce the viscosity of the system and control the reaction heat of the epoxy resin and the polyurethane, and under the synergistic action of the curing accelerator, the curing of the secondary pouring sealant is accelerated, and the construction time is shortened. In the present invention, the diluent may be methanol or propenyl glycidyl ether. The curing accelerator is hexaimidazole cyclotriphosphazene, and the curing accelerator is added into the primary pouring sealant to reduce the curing forming temperature, so that the curing accelerator can be rapidly cured at normal temperature, and the processing performance of the curing accelerator is improved. Compared with the primary pouring sealant, the secondary pouring sealant has higher temperature sensitivity and fluidity, and can be properly reduced to 150 ℃ and stirred for 20-30 minutes to obtain the secondary pouring sealant in order to slow down the aging of the secondary pouring sealant.

And the secondary glue injection is pressure glue injection, the glue injection is started from the glue injection pipe on the higher side, the rest glue injection pipes are observed, and if the secondary pouring glue flows out, the secondary pouring glue is immediately bound and blocked until the glue injection pipe is filled with the secondary pouring glue. If the bridge floor has a longitudinal joint, the secondary pouring sealant can seep out of the joint during secondary glue injection, and the glue injection is continued after waiting for 2 minutes, so that the secondary pouring sealant is ensured to fill the gap inside the hinge joint. For the hinge joint without cracks on the bridge deck, pouring is carried out until glue leaks at the beam end, or pouring is carried out for 15-20 minutes under the pressure of 0.2 MPa. After the secondary glue injection is finished, sundries such as steel plates, bolts and the like are disassembled, and the glue injection pipe protruding out of the bottom of the bridge and the measuring pipe are sawed off to finish the whole repairing process.

The features and properties of the present invention are described in further detail below with reference to examples.

Example 1

The embodiment of the invention provides a method for repairing a hinge joint of an uninterrupted traffic hollow slab bridge, which comprises the following steps:

cleaning plate seams and hinge seams; 3 battens are respectively nailed at the two ends of the plate seam, and the bottom of the batten is connected with the top of the plate seam to seal the beam end; wherein, the interval between the adjacent battens at the same side is 2 cm, and the pores between the battens are filled with foam plugging agents; a group of glue injection pipes and observation pipes are arranged between the battens at the two ends in a matched mode at intervals of 1.5 m; the same group of observation pipes and the glue injection pipes are spaced by 3 cm, and the height of the top surfaces of the glue injection pipes is 2 cm higher than that of the observation pipes; wherein the distance between the glue injection pipe and the top of the plate seam is 3 cm; filling the slab joints with filling strips, and then filling the slab joints with sealant; then the soft glass pressing strip is tightly attached to the hinge joint, and the steel plate strip is fixed on the hollow plate by using expansion screws after pressing the soft glass pressing strip, so that the bottom sealing of the plate joint can be finished; and performing primary glue injection through the glue injection pipe for 28 minutes, performing primary glue injection curing, and performing secondary glue injection again, wherein the applied pressure is 0.2MPa, and the time is 15 minutes.

The preparation steps of the sealant are as follows: premixing MS resin, white carbon black and graphene for 10 minutes, vacuumizing, stirring, heating to l00 ℃, and dehydrating for 2 hours. Then, reducing the temperature in the kettle to below 50 ℃, filling nitrogen, adding sodium dodecyl benzene sulfonate, and uniformly mixing under the vacuum condition; and finally, filling nitrogen to relieve the vacuum to normal pressure, and quickly pressing the materials into a plastic packaging tube to obtain the sealant.

The preparation method of the primary pouring sealant used in the primary glue injection step comprises the following steps: sequentially adding polyurethane, antioxidant, softening agent, calcium carbonate and white carbon black into the epoxy resin solution, and stirring for 30 minutes at the temperature of 150 ℃ to obtain the primary pouring sealant.

The preparation steps of the secondary pouring sealant used in the secondary glue injection step are as follows: and sequentially adding polyurethane, an antioxidant, a diluent and a curing accelerator into the epoxy resin solution, and stirring at the rotating speed of 140 ℃ for 20 minutes to obtain the secondary pouring sealant.

Example 2

cleaning plate seams and hinge seams; 4 battens are nailed into the two ends of the plate seam respectively, and the bottom of the battens is connected with the top of the plate seam to seal the beam end; wherein, the interval between the adjacent battens at the same side is 4 cm, and the pores between the battens are filled with foam plugging agents; a group of glue injection pipes and observation pipes are arranged between the battens at the two ends in a pairing mode at intervals of 2 meters; the same group of observation tubes and the glue injection tubes are separated by 5 cm, and the height of the top surfaces of the glue injection tubes is 3 cm higher than that of the observation tubes; wherein the distance between the glue injection pipe and the top of the plate seam is 5 cm; then filling the plate seams with sealant; then the soft glass pressing strip is tightly attached to the hinge joint, and the steel plate strip is fixed on the hollow plate by using expansion screws after pressing the soft glass pressing strip, so that the bottom sealing of the plate joint can be finished; and performing primary glue injection through a glue injection pipe for 23 minutes, and performing secondary glue injection after curing, wherein the applied pressure is 0.2MPa and the applied time is 15 minutes.

The preparation steps of the sealant are as follows: premixing MS resin, white carbon black and graphene for 20 minutes, vacuumizing, stirring, heating to 110 ℃, and dehydrating for 2 hours. Then, reducing the temperature in the kettle to below 50 ℃, filling nitrogen, adding sodium dodecyl benzene sulfonate, and uniformly mixing under the vacuum condition; and finally, filling nitrogen to relieve the vacuum to normal pressure, and quickly pressing the materials into a plastic packaging tube to obtain the sealant.

The preparation method of the primary pouring sealant used in the primary glue injection step comprises the following steps: and sequentially adding polyurethane, an antioxidant, a softening agent, calcium carbonate and white carbon black into the epoxy resin solution, and stirring at the temperature of 160 ℃ for 40 minutes to obtain the primary pouring sealant.

The preparation steps of the secondary pouring sealant used in the secondary glue injection step are as follows: sequentially adding polyurethane, an antioxidant, a diluent and a curing accelerator into the epoxy resin solution, and stirring for 30 minutes at the temperature of 150 ℃ to obtain the secondary pouring sealant.

Example 3

cleaning plate seams and hinge seams; 4 battens are nailed into the two ends of the plate seam respectively, and the bottom of the battens is connected with the top of the plate seam to seal the beam end; wherein, the interval between the adjacent battens at the same side is 3 cm, and the pores between the battens are filled with foam plugging agents; a group of glue injection pipes and observation pipes are arranged between the battens at the two ends in a matched mode at intervals of 1.8 m; the interval between the observation tube and the glue injection tube in the same group is 4 cm, and the height of the top surface of the glue injection tube is 2.5 cm higher than that of the observation tube; wherein the distance between the glue injection pipe and the top of the plate seam is 4 cm; filling the plate seams with sealant and sealing the bottom; and (3) injecting glue through the glue injection pipe for one time, wherein the glue injection time is 25 minutes, and the glue injection can be finished after curing.

The preparation steps of the sealant are as follows: premixing MS resin, white carbon black and graphene for 15 minutes, vacuumizing, stirring, heating to 105 ℃, and dehydrating for 2 hours. Then, reducing the temperature in the kettle to below 50 ℃, filling nitrogen, adding sodium dodecyl benzene sulfonate, and uniformly mixing under the vacuum condition; and finally, filling nitrogen to relieve the vacuum to normal pressure, and quickly pressing the materials into a plastic packaging tube to obtain the sealant.

The preparation method of the primary pouring sealant used in the primary glue injection step comprises the following steps: and sequentially adding polyurethane, an antioxidant, a softening agent, calcium carbonate and white carbon black into the epoxy resin solution, and stirring at the temperature of 155 ℃ for 35 minutes to obtain the primary pouring sealant.

Example 4

cleaning plate seams and hinge seams; the positions of two ends of the plate seam are respectively nailed into battens, and the bottom of the batten is connected with the top of the plate seam to seal the beam end; a group of glue injection pipes and observation pipes are arranged between the battens at the two ends in a matched mode at intervals of 1.8 m; the top surface of the glue injection pipe is 2.7 cm higher than the observation pipe; filling the slab joints with filling strips, and then filling the slab joints with sealant; then the soft glass pressing strip is tightly attached to the hinge joint, and the steel plate strip is fixed on the hollow plate by using expansion screws after pressing the soft glass pressing strip, so that the bottom sealing of the plate joint can be finished; and performing primary glue injection through a glue injection pipe for 28 minutes, and performing secondary glue injection after curing, wherein the applied pressure is 0.2MPa and the applied time is 15 minutes.

The preparation steps of the sealant are as follows: premixing MS resin, white carbon black and graphene for 16 minutes, vacuumizing, stirring, heating to 108 ℃, and dehydrating for 2 hours. Then, reducing the temperature in the kettle to below 50 ℃, filling nitrogen, adding sodium dodecyl benzene sulfonate, and uniformly mixing under the vacuum condition; and finally, filling nitrogen to relieve the vacuum to normal pressure, and quickly pressing the materials into a plastic packaging tube to obtain the sealant.

The preparation method of the primary pouring sealant used in the primary glue injection step comprises the following steps: and sequentially adding polyurethane, an antioxidant, a softening agent, calcium carbonate and white carbon black into the epoxy resin solution, and stirring at 153 ℃ for 32 minutes to obtain the primary pouring sealant.

The preparation steps of the secondary pouring sealant used in the secondary glue injection step are as follows: sequentially adding polyurethane, an antioxidant, a diluent and a curing accelerator into the epoxy resin solution, and stirring for 24 minutes at the temperature of 147 ℃ to obtain the secondary pouring sealant.

Example 5

cleaning plate seams and hinge seams; the positions of two ends of the plate seam are respectively nailed into battens, and the bottom of the batten is connected with the top of the plate seam to seal the beam end; a group of glue injection pipes and observation pipes are arranged between the battens at the two ends in a matched mode at intervals of 1.7 m; wherein the distance between the glue injection pipe and the top of the plate seam is 4.1 cm; then filling the plate seams with sealant; then the soft glass pressing strip is tightly attached to the hinge joint, and the steel plate strip is fixed on the hollow plate by using expansion screws after pressing the soft glass pressing strip, so that the bottom sealing of the plate joint can be finished; and performing primary glue injection through a glue injection pipe, wherein the glue injection time is 27 minutes, and performing secondary glue injection after curing, wherein the applied pressure is 0.2MPa, and the applied time is 15 minutes.

The sealant in the embodiment is CH-MF sealant, and the primary potting sealant and the secondary potting sealant are CH-GZ potting adhesives.

Effect example 1

Shear stress indexes required for adhesion failure between the primary potting adhesive and the substrate and between the secondary potting adhesive and the substrate in examples 1-5 are determined according to an adhesive tensile shear strength determination method GB/T7124-2008, and specific data are shown in Table 1.

TABLE 1 shear stress index

The data in table 1 show that the shear strength of the primary potting adhesive and the secondary potting adhesive provided in examples 1 to 4 is greater than that of the CH-GZ potting adhesive in example 5, which indicates that the compatibility between the components in the primary potting adhesive and the secondary potting adhesive and the configuration method improve the cohesiveness of the potting adhesive, and that the material can effectively transmit load, so that the bridge is reinforced to form a state that all hollow plates are stressed together. In the same embodiment, compared with the primary pouring sealant and the secondary pouring sealant, the shear strength of the primary pouring sealant is higher, which indicates that the calcium carbonate and the white carbon black can improve the bonding strength of the pouring sealant.

Effect example 2

1 ml of the primary pouring sealant and the secondary pouring sealant of examples 1 to 5 was applied to a glass plate, and the glass plate was naturally air-dried and cured at 25 ℃ for a specific time, which is shown in Table 2.

TABLE 2 Cure time List

As can be seen from the data in table 2, the curing time of the primary potting adhesive and the secondary potting adhesive provided in embodiments 1 to 4 of the present invention is shorter than that of the CH-GZ potting adhesive, which indicates that the potting adhesive provided in the present invention can be rapidly cured at a low temperature and shorten the construction period. In addition, the curing time of the secondary potting was short compared to that of the secondary potting, indicating that the addition of equivalent amounts of the diluent and the curing accelerator can accelerate the curing.

Effect example 3

The performances of the primary potting adhesive and the sealant in example 1 were tested according to GB50728-2011 "engineering structural reinforcement material safety certification technical specification", and the test results are shown in tables 3 and 4, respectively.

TABLE 3 Performance test results of one-shot pouring sealant

As can be seen from the data in Table 3, the pouring sealant has high strength, good toughness and good impact resistance; the viscosity is moderate, and the construction is convenient; the curing temperature range is wide, and the curing can be carried out under the contact pressure at room temperature; no volatile solvent is contained, and the shrinkage in the hardening process is small; the anti-aging and medium (acid, alkali and water) resistance performances are excellent; the adhesive has the advantages of long applicable period, convenient use, no toxicity, safety and environmental protection, belongs to I class A adhesive and has better adhesive property.

TABLE 4 Performance test results for sealants

As can be seen from the data in Table 4, the sealant has good construction performance and is easy to coat and scrape; the initial viscosity is high, and the water does not flow; the strength of the concrete and the bonding strength of the concrete are high; the aging resistance and the medium erosion resistance are good; the color of the concrete is similar to that of the concrete; the curing is carried out at normal temperature, the curing speed is high, and the curing speed can be adjusted according to the requirements of users; the paint does not contain volatile solvent, and basically does not shrink when hardened; the wet surface can be bonded, and the bonding force in a dry environment is stronger; belongs to class I A glue, and has better sealing effect.

In summary, the hinge joint repairing method for the uninterrupted traffic hollow slab bridge according to the embodiment of the present invention forms a closed cavity in the hinge joint, reserves the entrance and the exit in a controlled manner, effectively uses the pressure grouting equipment to sequentially pour the pouring sealant into the damaged hinge joint and the gap between the slab joints in stages and in regions from the bottom of the bridge, and after the pouring sealant is cured, the bonding between the concrete on the two sides can be recovered, so as to effectively recover the integrity of the bridge structure. The method has the advantages of convenient construction process, short construction period, no need of traffic interruption, no vehicle congestion, no influence on the original structure of the bridge, less manpower and material resources consumption and better economy.

The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. The method for repairing the hinge joint of the uninterrupted traffic hollow slab bridge is characterized by comprising the following steps of:

clamping the end part of the slab joint by using battens, connecting the bottom of the slab joint with the top of the slab joint to seal the beam end, arranging a glue injection pipe and an observation pipe in a pairing manner every 1.5-2 m between the battens at two ends, and then sealing the bottom of the slab joint; and (3) performing one-time glue injection and full filling solidification on the plate seams of 0-3 mm through the glue injection pipe.

2. The method for repairing the hinge joint of the uninterrupted traffic hollow slab bridge according to claim 1, wherein the slab joint or the construction temperature of more than 3 mm is lower than 15 ℃, and after the primary glue injection is cured, secondary glue injection is performed, wherein the pressure applied by the secondary glue injection is 0.2MPa, and the time is 15 minutes.

3. The uninterrupted traffic hollow slab bridge hinge joint repairing method according to claim 1, wherein in the step of closing the beam end, 3-4 battens are nailed into the plate joint, the space between the adjacent battens is 2-4 cm, and the pores between the battens are filled with the foam plugging agent.

4. The uninterrupted traffic hollow slab bridge hinge joint repairing method according to claim 1, wherein the paired observation pipes are spaced from the glue injection pipe by 3-5 cm, the height of the top surface of the glue injection pipe is 2-3 cm higher than that of the observation pipes, and the distance between the glue injection pipe and the top of the slab joint is 3-5 cm.

5. The method for repairing a hinge joint of an uninterrupted traffic hollow slab bridge according to claim 1, wherein in the bottom sealing step, the slab joint is filled with sealant, a soft glass bead is used to cling to the hinge joint, and the slab is fixed on the hollow slab by using expansion screws after pressing the soft glass bead, so that the bottom sealing of the slab joint is completed.

6. The uninterrupted traffic hollow slab bridge hinge joint repairing method according to claim 5, wherein the sealant is prepared by the following steps: premixing MS resin, white carbon black and graphene for 10-20 minutes, vacuumizing, stirring, heating to l00-110 ℃, and dehydrating for 2 hours; then, reducing the temperature in the kettle to below 50 ℃, filling nitrogen, adding sodium dodecyl benzene sulfonate, and uniformly mixing under the vacuum condition; and finally, filling nitrogen to relieve the vacuum to normal pressure, and quickly pressing the materials into a plastic packaging tube to obtain the sealant.

7. The method for repairing the hinge joint of the uninterrupted traffic hollow slab bridge according to claim 1, wherein the step of configuring the primary pouring sealant used in the step of injecting the primary glue comprises the following steps: sequentially adding polyurethane, antioxidant, softening agent, calcium carbonate and white carbon black into the epoxy resin solution, and stirring for 30-40 minutes at the temperature of 150-160 ℃ to obtain the primary pouring sealant.

8. The uninterrupted traffic hollow slab bridge hinge joint repairing method according to claim 2, wherein the secondary pouring sealant used in the secondary glue injecting step is configured by the following steps: sequentially adding polyurethane, an antioxidant, a diluent and a curing accelerator into the epoxy resin solution, and stirring for 20-30 minutes at the temperature of 140-150 ℃ to obtain the secondary pouring sealant.

9. The method for repairing the hinge joint of the uninterrupted traffic hollow slab bridge according to claim 1, wherein the time for injecting glue at one time is less than 30 minutes.

10. The method for repairing an uninterrupted traffic hollow slab bridge hinge joint according to claim 5, wherein in the bottom sealing step, a filling strip is filled in the slab joint, and then the sealant is used for filling the slab joint.