Concrete curing device for highway bridge construction

Abstract

The invention provides a concrete curing device for highway bridge construction, and relates to the field of highway bridge construction. The concrete curing device for highway bridge construction comprises an outer frame and an inner frame which are fixed, the outer frame is matched with the section outline of a pier, a sealing gasket fixed relative to the top of the outer frame is arranged in the inner frame, the sealing gasket is in an inverted-V shape, a vent groove, a diversion groove, a drainage groove and a groove are formed in the inner frame, and the diversion groove, the drainage groove and the groove are communicated. The groove is used for being filled with water-absorbent resin, and a plurality of rows of fiber bundles are arranged in the groove. According to the concrete curing device for highway bridge construction, all-directional uniform water supplementing is achieved through the non-contact gaps and the flexible fiber bundles, water vapor in the gaps is condensed into water drops on the inner sides of the sealing gaskets and flows back to the flow guide grooves along the notches, water circulation is formed, the external water supplementing frequency is reduced, and the water supplementing efficiency is improved. And the problem that maintenance needs to be prolonged or reworked due to local quality defects caused by a convex structure on the surface of the bridge pier and external environment interference in covering type maintenance is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of highway bridge construction, in particular to a concrete curing device for highway bridge construction. BACKGROUND

[0002] Highway bridge construction refers to a series of engineering activities for building the main structure of the bridge and related auxiliary facilities in highway construction, and is an important part of highway engineering. The upper surface of the bridge pier serves as a key part connecting the bent cap and the pier column, and is exposed to the natural environment for a long time. It is easily affected by factors such as rainwater erosion, temperature change, and vehicle load vibration. The strength and durability of the concrete directly relate to the overall safety of the bridge. For the curing of the concrete on the upper surface of the bridge pier, the core requirements of "moisture preservation, temperature preservation, and damage prevention" are mainly focused on, and the curing personnel regularly (usually every 2 to 4 hours) reach the upper surface of the pier by using climbing equipment (such as scaffolding or climbing vehicles), and then directly sprinkle water on the concrete surface with a watering can or a water pipe to keep the surface moist. In order to reduce water evaporation, a cover is used, i.e. after the initial setting of the concrete, a plastic film, geotextile, or burlap cover is laid, and the curing personnel sprinkle water on the cover to saturate it, and then use the water-retaining capacity of the cover to maintain the surface humidity.

[0003] The traditional curing method mainly uses manual watering combined with a covering curing method, such as a permeable moisture pad, which relies on the water absorption of the material to directly contact the concrete surface to transfer water. However, there are often embedded parts (such as connecting steel bars, bolts, etc.) and construction joint protruding structures on the upper surface of the pier, which can cause the moisture pad to be partially elevated, forming a contact blind area. The water evaporation rate in the blind area is high, which can easily cause local dry cracking. If a plastic film is used, although the plastic film has a certain ductility and can reduce the blind area, the plastic film is easily torn by the wind or washed away by rainwater, causing the edges to curl up and making the sealing performance ineffective. Rainwater can seep into the gap along the curled edges and form local water accumulation on the concrete surface, which may cause the need for extended curing or rework due to local quality defects. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a concrete curing device for highway bridge construction, which solves the problem of the need for extended curing or rework due to local quality defects caused by the protruding structures on the surface of the pier and external environmental interference in the covering curing method.

[0005] In order to achieve the above object, the present application is implemented by the following technical scheme: a concrete curing device for highway bridge construction, comprising a fixed external frame and an internal frame, the external frame is matched with the cross section profile of the pier, a sealing pad is arranged in the internal frame and fixed on the top of the external frame, the sealing pad is in inverted V shape, a ventilation groove, a connected flow guide groove, a drainage groove and a groove are arranged in the internal frame, the groove is filled with water absorbing resin, a plurality of fiber bundles are arranged in the groove, one end of the fiber bundle is embedded in the bottom of the groove, and the other end is in contact with the surface of the concrete. When the internal frame is filled with gas, the sealing pad lifts the external frame, and a gap is formed between the internal frame and the concrete, at this time, the convex part A on the inner side of the internal frame is in contact with the convex part B on the bottom of the sealing pad, when the air pressure in the internal frame exceeds the threshold value, the convex part A and the convex part B are separated.

[0006] Preferably, the internal frame and the sealing pad are provided with a plurality of internal frames, and the plurality of internal frames are sequentially fixed.

[0007] Preferably, the internal frame is fixedly installed with an elastic sheet on the inner side, one end of the elastic sheet is fixed with the sealing pad, and a plurality of notches are arranged on the end of the elastic sheet and the sealing pad which are close to each other.

[0008] Preferably, the ventilation groove and the groove are a plurality of ventilation grooves and grooves, and the plurality of ventilation grooves and grooves are staggered.

[0009] Preferably, the external frame comprises a top plate, a light plate frame and a telescopic pipe, and the three are sequentially fixed, the two ends of the sealing pad are fixed with the light plate frame, the internal frame is located in the light plate frame, and the bottom end of the telescopic pipe is fixedly connected with a sealing ring for contacting the outer peripheral surface of the pier.

[0010] Preferably, the top plate is a honeycomb structure.

[0011] Preferably, the external frame further comprises a gas bag fixed with the bottom of the telescopic pipe, and when the gas bag is inflated, the outer peripheral surface of the pier is in surface contact.

[0012] Preferably, the light plate frame and the gas bag are communicated with an air inlet pipe on the outer side, and a valve is arranged on the two air inlet pipes.

[0013] Preferably, the external frame is fixedly installed with an ear.

[0014] Compared with the prior art, the present application has the following beneficial effects: The concrete curing device used in highway bridge construction has an internal frame that uses gas support to form a non-contact gap with the bridge pier, which not only allows the sealing gasket to open and maintain overall stability, but also prevents scratches on the concrete surface. Combined with the ultra-fine glass fiber bundle with flexibility and flexibility, it can bypass the embedded parts on the upper surface of the pier and the raised structure of the construction joint to achieve all-round contact between the fiber bundle and the concrete surface. The fiber bundle can evenly transfer moisture to various areas, improve the moisture coverage rate and reduce the risk of cracking in blind areas caused by excessive evaporation rate of moisture; through the set guide grooves, drainage grooves and grooves, the water vapor in the gap condenses into water droplets on the inside of the sealing gasket, and flows back to the guide groove along the incision, forming a water circulation and reducing the frequency of external water replenishment.

[0015] The concrete curing device used in highway bridge construction achieves dynamic sealing through the raised part B of the inverted "V"-shaped sealing gasket and the raised part A of the internal frame. It can not only ensure the sealing of the gap under normal air pressure, but also separate the exhaust when the air pressure exceeds the threshold, avoiding deformation of the device caused by gas accumulation, and solving the problem of softening of surface mortar and delayed strength development caused by local water accumulation due to rainwater infiltration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the external frame of the present invention being installed on a bridge pier; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a cross-sectional view of the front view of the outer frame of the present invention; Figure 4 A cross-sectional view of the external frame of the present invention when installed on a bridge pier; Figure 5 This is a cross-sectional view of the present invention when the raised portion A and the raised portion B are in contact; Figure 6 This is a cross-sectional view of the present invention when the raised portion A and the raised portion B are out of contact; Figure 7 An exploded view of the outer frame of the present invention; Figure 8 is a schematic diagram of the internal framework of the present invention; Figure 9 is a schematic diagram of a sealing gasket of the present invention; Figure 10 Schematic diagram of the elastic sheet of the present invention.

[0017] Among them, 1. External frame; 101. Top plate; 102. Light plate frame; 103. Telescopic tube; 104. Airbag; 2. Internal frame; 3. Sealing gasket; 4. Ventilation groove; 5. Guide groove; 6. Drainage groove; 7. Groove; 8. Resin; 9. Fiber bundle; 10. Protrusion A; 11. Protrusion B; 12. Elastic sheet; 13. Incision; 14. Inlet pipe; 15. Lifting ear. DETAILED DESCRIPTION

[0018] As Figures 1-10 shown, a concrete curing device for highway bridge construction comprises a fixed external frame 1 and an internal frame 2, the external frame 1 is adapted to the cross-sectional profile of the pier, the external frame 1 comprises a top plate 101, a light plate frame 102 and an expansion pipe 103, and the three are fixed in turn, the two ends of the sealing gasket 3 are fixed with the light plate frame 102, the internal frame 2 is located in the light plate frame 102, the bottom end of the expansion pipe 103 is fixedly connected with a sealing ring for contacting the outer peripheral surface of the pier, the top plate 101 is a honeycomb structure, when water is sprinkled on the top plate 101, the water can fall on the sealing gasket 3, thereby facilitating the water supplement of the concrete, the external frame 1 further comprises an air bag 104 fixedly connected with the bottom of the expansion pipe 103, when the air bag 104 is inflated, a surface contact is formed between the air bag 104 and the outer peripheral surface of the pier, the light plate frame 102 and the air bag 104 are both communicated with an air inlet pipe 14, a valve is installed on each of the two air inlet pipes 14, a lifting lug 15 is fixedly installed on the external frame 1, by connecting the lifting lug 15 with a rope outside, the external frame 1 can be hoisted to the pier, the internal frame 2 is provided with a sealing gasket 3 fixed relative to the top of the external frame 1, the internal frame 2 and the sealing gasket 3 are both provided with a plurality of internal frames 2, and the plurality of internal frames 2 are fixed in turn, an elastic sheet 12 is fixedly installed on the inner side of the internal frame 2, one end of the elastic sheet 12 is fixed with the sealing gasket 3, a plurality of notches 13 are arranged on the end of the elastic sheet 12 and the sealing gasket 3 which are close to each other, the water above the sealing gasket 3 can enter the flow guide groove 5 along the notches 13, and then enter the recess 7 along the drainage groove 6, the sealing gasket 3 is in inverted "V" shape, the top of the sealing gasket 3 is fixed with the top of the external frame 1, the internal frame 2 is provided with a ventilation groove 4 and a flow guide groove 5, a drainage groove 6 and a recess 7 connected therewith, the ventilation groove 4 and the recess 7 are both provided with a plurality of ventilation grooves 4 and recesses 7, and the plurality of ventilation grooves 4 and recesses 7 are distributed alternately, the recess 7 is filled with water-absorbing resin 8, a plurality of ultra-fine glass fiber bundles 9 are arranged in the recess 7, the glass fiber bundles 9 have flexible bending property, one end of the fiber bundle 9 is embedded in the bottom of the recess 7, and the other end is in contact with the surface of the concrete. When the internal frame 2 is filled with gas, the sealing gasket 3 lifts the external frame 1, and a gap is formed between the internal frame 2 and the concrete, realizing non-contact curing, at this time, the convex portion A10 on the inner side of the internal frame 2 is in contact with the convex portion B11 on the bottom of the sealing gasket 3, when the air pressure in the internal frame 2 exceeds the threshold value, the convex portion A10 and the convex portion B11 are separated from each other, so that part of the gas is discharged to the outside.

[0019] In use, first, the device is hoisted and preliminarily fixed; that is, the device is hoisted smoothly to the top of the pier by connecting the external frame 1 to the external hoisting equipment through the lifting lugs 15, the length of the telescopic pipe 103 is adjusted to align the external frame 1 with the outer contour of the pier, then the valve of the air inlet pipe 14 of the air bag 104 is opened, the air bag 104 is inflated to form a close surface contact with the outer surface of the pier (the degree of inflation is judged by observation, and the inflation pressure is usually 0.3 to 0.5 kPa), the valve is closed to complete the outer sealing, at this time the device as a whole is fixed on the top of the pier by the friction of the air bag 104, avoiding displacement; then, the internal frame 2 is inflated and the gap is adjusted; that is, the valve of the air inlet pipe 14 of the light plate frame 102 is opened, the air inlet pipe 14 is inflated by the external air pump, thereby inflating the space between the internal frame 2 and the external frame 1, the gas pushes the internal frame 2 to move slightly downward, so that the bottom of the internal frame 2 gradually forms a gap with the concrete surface, when the inflation pressure reaches 0.5 kPa (monitored by the pressure gauge on the air inlet pipe 14), the valve is closed, as shown in Figure 5 At this time, the inverted "V" shaped sealing gasket 3 remains open due to the internal air pressure, the protruding part B11 at the bottom closely fits the protruding part A10 on the inner side of the internal frame 2, ensuring the initial sealing of the gap and preventing gas leakage in the gap. It should be noted that under the action of air pressure, the sealing gasket 3 will push the light plate frame 102 to rise, thereby creating a gap between the internal frame 2 and the upper surface of the concrete, and forming a non-contact curing space supported by the gas; the light plate frame 102 will also drive the telescopic pipe 103 to rise, so that the telescopic pipe 103 extends to the maximum, i.e. in a taut state, the air bag 104 cooperates with the sealing ring at the bottom end of the telescopic pipe 103 to keep the external frame 1 relatively fixed with the pier by friction, and to achieve double sealing; at the same time, the ultra-fine glass fiber bundle 9 naturally droops due to its flexibility, and the end contacts the concrete surface (the contact pressure is controlled by the gap height to ensure that the fiber bundle 9 neither compacts the concrete surface nor transmits water).

[0020] Then, water is uniformly sprayed on the honeycomb top plate 101, the water passes through the honeycomb holes of the top plate 101 and falls on the sealing gasket 3, flows into the drainage groove 5 along the cutout 13 (cutout 13 is a strip-shaped groove with a width of 2 mm) on the sealing gasket 3 and the elastic sheet 12, is collected in the groove 7 through the drainage groove 6, and is absorbed by the water-absorbing resin 8 in the groove 7 (each 10 cm long groove 7 can absorb and store about 50 ml of water); at this time, the fiber bundle 9 continuously transmits the water in the water-absorbing resin 8 to the concrete surface by capillary action, maintaining the relative humidity of the surface at 80% to 90%; the gas released during the hardening of the concrete gradually increases the air pressure in the gap, when the air pressure exceeds 0.8 kPa, as shown in Figure 6As shown, the internal frame 2 exceeds the threshold and pushes the sealing gasket 3 and the elastic sheet 12 to deform, the protrusions A10 on the sealing gasket 3 are separated from the protrusions B11, the gas enters the flow guide groove 5, and is discharged from the top plate 101 through the cutout 13 until the gas pressure drops below 0.6 kPa, the protrusions are reattached to the sealing; During this period, the water vapor in the gap condenses into water droplets inside the sealing gasket 3, flows back to the flow guide groove 5 along the cutout 13, forms a water circulation, and reduces the frequency of external water supply; After the maintenance is completed, the air bag 104 and the air release valve of the light plate frame 102 are opened in turn, and the device can be lifted away from the pier through the lifting lug 15 after it is contracted.

[0021] It should be noted that the conventional maintenance method is mostly artificial watering combined with covering maintenance, such as permeable moisture pad, which relies on the water absorption of the material itself to realize water transfer by directly contacting the concrete surface. However, there are protruding structures such as connecting steel bars, bolts, and construction joints on the upper surface of the pier, which can cause the moisture pad to be partially suspended, forming a contact blind area. The water evaporation rate in the blind area is relatively high, which can easily cause local dry cracking. If a plastic film is used, although the plastic film has a certain ductility and reduces the blind area, the plastic film is easily torn by the wind or washed away by rain, causing the edge to curl up and making the sealing performance ineffective. Rainwater can seep into the gap along the curled edge and form local water accumulation on the concrete surface, which may cause the maintenance to be extended or reworked due to local quality defects. The water accumulation area hinders air circulation due to excessive water, which can easily cause the concrete surface mortar to soften and the strength development to lag. Data shows that when the protrusion height exceeds 3 mm, the contact rate of the moisture pad with the concrete decreases to below 70%, the water evaporation rate in the blind area is 3 to 5 times that in the contact area, and local dry cracking is easily caused. In highway bridge construction, concrete maintenance is a key link to ensure structural strength and durability. Currently, the commonly used maintenance method is to cover the concrete surface with a plastic film to reduce water evaporation and promote cement hydration by using its good water locking performance. However, the plastic film has the disadvantages of being easily broken and not firmly fixed, and its maintenance effect is low in harsh environments such as strong winds, and even cracks may occur in the concrete due to local dryness. If a geotextile is used for covering, the fiber structure of the geotextile has pores through which water can slowly evaporate (especially in high-temperature and windy environments, the evaporation speed is very fast). If used alone, frequent watering (possibly 2 to 3 times a day) is required to maintain moisture, otherwise the concrete will dry out in 1 to 2 days, increasing the maintenance workload. If a hard mat is used for covering, the water evaporation speed is even faster due to larger gaps, making it almost impossible to lock water for a long time. Even if the mat is watered frequently, the contact between the mat and the concrete surface may not be tight (the gaps are easily dried), leading to local cracking.

[0022] The device solves this problem thoroughly by forming a non-contact gap (a gap between the inner frame 2 and the concrete surface) through gas support and the flexibility of the ultra-fine glass fiber bundle 9: one end of the fiber bundle 9 is embedded in the bottom of the groove 7 to contact the water-absorbing resin 8, and the other end is bent around the protruding structure to realize all-around contact with the concrete surface, even around the embedded part, which can maintain stable moisture transmission and improve moisture coverage; at the same time, the staggered distribution of the groove 7 and the ventilation groove 4 ensures uniform water vapor circulation in the gap and avoids local drying, reducing the risk of cracking compared to traditional moisture pads; and for the problem that plastic film is easily torn by wind, the edge is raised, leading to sealing failure, and local water accumulation caused by rainwater infiltration will cause the surface mortar to soften, the device adopts a double-sealing structure: first, the air bag 104 forms a surface contact seal with the outer surface of the bridge pier after inflation, and the sealing ring at the bottom of the telescopic pipe 103 can maintain high sealing performance in windy environments, improving the wind resistance of traditional plastic film; second, the protruding part B11 of the inverted "V"-shaped sealing pad 3 and the protruding part A10 of the inner frame 2 realize dynamic sealing: when the air pressure is normal, they are tightly connected; when the air pressure exceeds the threshold, they separate and exhaust, ensuring the sealing performance of the gap and avoiding the accumulation of gas, which can cause deformation of the device and eliminate the problem of strength development lag caused by water accumulation; for the problem that geotextile needs to be watered 2 to 3 times a day and has poor water-locking ability, the water-absorbing resin 8 and water circulation solve the problem: the water-absorbing resin 8 in the groove 7 can store a large amount of water and release it slowly in high-temperature and windy environments, and the capillary action of the fiber bundle 9 continuously replenishes water, keeping the relative humidity of the concrete surface stable at 80%-90%, reducing the water replenishment frequency by 60% compared to geotextile. At the same time, the non-contact design avoids scratching the unhardened concrete surface with the rough edges of the hard seat, and the cutout 13 of the elastic sheet 12 and the sealing pad 3 guides the condensate water back to the drainage groove 5, forming a closed loop of water replenishment, storage, and return, reducing water waste; in addition, the honeycomb-shaped top plate 101 of the outer frame 1 facilitates uniform watering, and the directional water guide of the drainage groove 5 and the drainage groove 6 avoids uneven water distribution caused by traditional film wrinkles, ensuring stable maintenance effect. For the poor size adaptability of traditional maintenance materials to bridge piers and the low efficiency of manual laying, the set of lifting lugs 15 shortens the installation time of single pier, reduces the working hours compared to manual laying, and the independent inflation of the air bag 104 and the light plate rack 102 can control the outer sealing and the internal gap respectively, which can still maintain stable operation in windy and rainy environments, solving the problem of sudden decrease in maintenance effect of traditional materials in complex environments, ensuring uniform development of concrete strength, and reducing the risk of rework or prolonged maintenance caused by local quality defects.

[0023] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A concrete curing device for highway bridge construction, characterized by: The invention comprises an external frame (1) and an internal frame (2) which are fixed to each other, wherein the external frame (1) is adapted to the cross-sectional profile of the bridge pier, and a sealing pad (3) fixed relative to the top of the external frame (1) is provided in the internal frame (2), and the sealing pad (3) is in an inverted "V" shape, and an air vent (4) and a connected guide groove (5), a drainage groove (6) and a groove (7) are provided in the internal frame (2), and the groove (7) is used to be filled with a water-absorbing resin (8), and a plurality of rows of fiber bundles (9) are provided in the groove (7), and one end of the fiber bundle (9) is embedded in the bottom of the groove (7), and the other end is in contact with the concrete surface; When the internal frame (2) is filled with gas, the sealing gasket (3) lifts up the external frame (1) and forms a gap between the internal frame (2) and the concrete. At this time, the raised portion A (10) on the inner side of the internal frame (2) contacts the raised portion B (11) at the bottom of the sealing gasket (3). When the air pressure in the internal frame (2) exceeds a threshold value, the raised portion A (10) and the raised portion B (11) are separated from each other.

2. A concrete curing device for highway bridge construction according to claim 1, characterized in that: A plurality of the internal frames (2) and sealing pads (3) are provided, and the plurality of internal frames (2) are fixed in sequence.

3. A concrete curing device for highway bridge construction according to claim 1 or 2, characterized in that: An elastic sheet (12) is fixedly mounted on the inner side of the internal frame (2), one end of the elastic sheet (12) is fixed to the sealing gasket (3), and a plurality of cutouts (13) are provided on the ends of the elastic sheet (12) and the sealing gasket (3) that are close to each other.

4. The concrete curing device for highway bridge construction according to claim 1, characterized in that: There are a plurality of ventilation grooves (4) and grooves (7), and the plurality of ventilation grooves (4) and grooves (7) are staggeredly distributed.

5. The concrete curing device for highway bridge construction according to claim 1, characterized in that: The external frame (1) comprises a top plate (101), a light plate frame (102) and a telescopic tube (103), and the three are fixed in sequence. Both ends of the sealing gasket (3) are fixed to the light plate frame (102). The internal frame (2) is located in the light plate frame (102). The bottom end of the telescopic tube (103) is fixedly connected to a sealing ring for contacting the outer peripheral surface of the pier.

6. The concrete curing device for highway bridge construction according to claim 5, characterized in that: The top plate (101) has a honeycomb structure.

7. The concrete curing device for highway bridge construction according to claim 5, characterized in that: The external frame (1) further comprises an air bag (104) fixed to the bottom of the telescopic tube (103); when the air bag (104) is inflated, surface contact is formed between the air bag (104) and the outer peripheral surface of the bridge pier.

8. The concrete curing device for highway bridge construction according to claim 7, characterized in that: The outer sides of the light plate frame (102) and the air bag (104) are both connected to an air intake pipe (14), and valves are installed on both air intake pipes (14).

9. The concrete curing device for highway bridge construction according to claim 1, characterized in that: A lifting lug (15) is fixedly mounted on the outer frame (1).

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