Underwater damaged pier column repairing and reinforcing structure based on glass fiber reinforced plastic sand inclusion plate

Abstract

The utility model belongs to the field of pier column repairing and reinforcing, and provides an underwater damaged pier column repairing and reinforcing structure based on a glass fiber reinforced plastic sand inclusion plate, which comprises a pile cap and a pier column poured on the upper surface of the pile cap, the lower ends of the pile cap and the pier column are positioned below the water surface, and the upper end of the pier column is positioned above the water surface. The repairing and reinforcing structure comprises a structural framework which makes contact with the upper surface of the pile cap and is fixedly connected with the upper surface of the pile cap through bolts, a glass fiber reinforced plastic sand inclusion plate and pre-filled aggregate grouting concrete, and the structural framework comprises a clamping groove base, a plurality of H-shaped positioning rods and a stainless steel hose clamp. The H-shaped positioning rod is installed on the clamping groove base in the length direction of the pier column till the H-shaped positioning rod extends to the position above the water surface. Materials are economical, and reinforcement is simple. After concrete is poured, the pier column and the whole structure are formed into a whole, the bearing capacity and durability of the pier structure can be remarkably improved, and the corrosion resistance and hydraulic performance of the column body are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pier column repair reinforcing technical field especially relates to a kind of underwater damaged pier column repair reinforcing structure based on glass steel sand plate for repairing and reinforcing underwater pier column without removing formwork construction. BACKGROUND

[0002] Bridge is the key part of infrastructure, to meet the needs of economic development, the number of bridges in China is more and more. And pier is as the important component of supporting vertical load of bridge superstructure and bearing horizontal load such as earthquake, under the action of load and external environment, pier is easy to appear various diseases. The existence of these diseases greatly reduces the service life of pier, and serious will cause the collapse of bridge, there is great safety hazard. Pier damage will lead to the interruption of bridge "lifeline", the loss caused by economy and personnel casualty will be incalculable. Therefore, it is extremely important to reinforce pier in time.

[0003] For the problem of active service bridge, underwater pier column damage, the current common method mainly includes: (1) first set cofferdam to isolate water, then repair defects outside pile column (such as sticking steel plate, sticking fiber composite material, increasing cross-sectional area, external prestress, etc.), although the process can avoid underwater construction, but cofferdam construction cost is high, construction period is long, and pile durability is difficult to improve. (2) directly repair in water, bind composite fiber cloth, and coat with resin. The method requires great working strength of diver, and it is difficult to smooth the repair mortar, and the strength of the repair mortar is low after condensation under water, the quality is difficult to control, and the mortar is difficult to smooth, which can cause the protrusion of outer fiber composite cloth, resulting in stress concentration. (3) a more advanced repair method is underwater glass fiber sleeve reinforcing technology, also known as "jacket" method, which is to repair damaged structure of bridge pier by using epoxy grouting material, and to form a unified closed whole with glass fiber sleeve, which can effectively resist external erosion. The advantage is that it can be directly constructed under water without cofferdam and large equipment, and the sleeve shape and thickness are simple to customize. But the glass fiber sleeve closing fastener is easy to fall off, and epoxy grouting material is expensive, and can only prevent further corrosion of pile, and the repair effect on existing hole defects of pier is not obvious.

[0004] To overcome the shortcomings of prior art, improve underwater pier repair and reinforcement speed, reduce reinforcement cost, simplify construction method and reduce construction difficulty, a repair and reinforcement structure for damaged pier in water is provided. Utility model content

[0005] The utility model aims at providing a structure for repairing and reinforcing damaged pier under water without cofferdam construction and form removal.

[0006] To achieve the above object, the technical scheme of the utility model is:

[0007] An underwater damaged pier column repair and reinforcement structure based on glass steel sandwich plate, comprising pile cap and pier column poured on the upper surface of the pile cap, the lower end of the pile cap and the pier column is below the water surface, the upper end of the pier column is above the water surface, the repair and reinforcement structure comprises a structural framework in contact with the upper surface of the pile cap and fixed by bolts, glass steel sandwich plate and pre-filled aggregate grouting concrete, the structural framework comprises a clamping groove base, a plurality of H-shaped positioning rods and stainless steel collars, the clamping groove base is installed along the length direction of the pier column until extending above the water surface, the glass steel sandwich plate is inserted into the structural framework along the groove of the H-shaped positioning rod, the bottom surface is embedded into the clamping groove base, and the outer surface of the glass steel sandwich plate is equidistantly installed with the stainless steel collars; the repair and reinforcement structure and the pier column form a containing cavity, the containing cavity is filled with the pre-filled aggregate grouting concrete from bottom to top after drainage, and waterproof adhesive tape is arranged at the contact position between the structural framework and the glass steel sandwich plate.

[0008] Further, the underwater damaged pier column repair and reinforcement structure further comprises the step of pasting waterproof adhesive tape before the structural framework is sunk, and the waterproof adhesive tape is pasted on the groove wall of the H-shaped positioning rod and the base.

[0009] Further, the underwater damaged pier column repair and reinforcement structure, the inner wall of all the H-shaped positioning rods is provided with a foam water stop strip assembly with a thickness slightly smaller than the containing cavity, when the structural framework is sunk and contacted with water, the BW water-swelling water stop strip slowly swells when contacted with water, so that the reinforcement structure is tightly contacted with the existing pier column, and displacement is avoided.

[0010] Further, the underwater damaged pier column repair and reinforcement structure, the inner wall of the clamping groove base is provided with an annular BW water-swelling water stop tape, which swells when contacted with water, is tightly contacted with the existing pier column, and has a water-blocking effect.

[0011] Further, the underwater damaged pier column repair and reinforcement structure, the distance between the inner wall of the clamping groove base and the existing pier column is equal along the radial direction of the existing pier column. In order to facilitate connection with the pile cap, suitable holes are pre-provided at the bottom of the clamping groove. In addition, the thickness of the groove wall should not be too thin, and the height of the groove wall should not be too low, and the width of the groove is slightly larger than the thickness of the glass steel sandwich plate.

[0012] Further, the underwater damaged pier column repair and reinforcement structure, the length of a single H-shaped positioning rod is 1 m. According to the water level height, the number of H-shaped positioning rods is determined. The connection of each positioning rod, rod member and base is bolted connection. The flange of the H-shaped positioning rod is curved, and the thickness of the flange is greater than 1 / 3 of the height of the rod member cross section.

[0013] Further, the underwater damaged pier column repair and reinforcement structure, the glass fiber reinforced plastic sand-enclosed plate is in the shape of a thin-walled cylindrical axial segmented body, and is inserted into the clamping groove of the framework in sequence after the framework is fixed, so as to form a sealed cavity.

[0014] Further, the underwater damaged pier column repair and reinforcement structure, the glass fiber reinforced plastic sand-enclosed plate is in the shape of a thin-walled cylindrical axial segmented body, and is inserted into the clamping groove of the framework in sequence after the framework is fixed, so as to form a sealed cavity.

[0015] Further, the underwater damaged pier column repair and reinforcement structure, the glass fiber reinforced plastic sand-enclosed plate is in the shape of a thin-walled cylindrical axial segmented body, and is inserted into the clamping groove of the framework in sequence after the framework is fixed, so as to form a sealed cavity.

[0016] Compared with the prior art, the underwater damaged pier column repair and reinforcement structure has the beneficial effects that:

[0017] 1. The underwater damaged pier column repair and reinforcement structure does not need cofferdam construction, has a short construction period and low cost.

[0018] 2. The underwater damaged pier column repair and reinforcement structure uses pre-filled aggregate grouting concrete as a repair agent.

[0019] 3. The underwater damaged pier column repair and reinforcement structure is made of glass fiber reinforced plastic sand-enclosed material, is light in weight, high in strength, large in conveying capacity, convenient to install and low in comprehensive investment.

[0020] 4. The underwater damaged pier column repair and reinforcement structure has a compact structure and forms a cavity with good sealing performance.

[0021] 5、The whole structure has a framework as support, effectively preventing the influence of adverse factors such as large water flow on the stability of the reinforcing structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for the ordinary skilled in the art.

[0023] Figure 1 It is a structural schematic diagram of the underwater damaged pier column repairing and reinforcing structure based on the glass steel sand-enclosed plate of the utility model.

[0024] Figure 2 It is a concrete column cross section diagram after the method reinforcing of the utility model.

[0025] Figure 3 It is a clamping groove base schematic diagram in the utility model.

[0026] Figure 4 It is a clamping groove base top view in the utility model.

[0027] Figure 5 It is an H-shaped positioning rod schematic diagram in the utility model.

[0028] Figure 6 It is a stainless steel throat clamp schematic diagram in the utility model.

[0029] Figure 7 It is a pre-filled aggregate grouting concrete schematic diagram in the utility model in the pressure pumping grouting process.

[0030] Figure 8 It is a reinforcing process schematic diagram of the utility model.

[0031] In the drawing: 1-pier column, 2-pile cap, 31-clamping groove base, 32-groove, 33-reserved hole, 34-groove wall, 41-H-shaped positioning rod, 42-bolt, 43-foam water stop strip assembly, 43a-XPS foam strip, 43b-BW water-swelling water stop strip, 44-waterproof adhesive tape, 46-U-shaped iron ring, 51-glass steel sand-enclosed plate, 6-concrete filler, 7-stainless steel throat clamp. DETAILED DESCRIPTION

[0032] The specific embodiments of the utility model will be further described below with reference to the drawings. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation on the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] The utility model provides a kind of underwater damaged pier column repair reinforcing structure based on glass steel sand plate.The pier includes pile cap 2 and pier column 1, pier column 1 is poured on the upper surface of pile cap 2, the lower end of pile cap 2 and pier column 1 is below water level, and the upper end of pier column 1 is above water level.The reinforcing repair structure includes structural framework, glass steel sand plate 51 and pre-filled aggregate grouting concrete, the structural framework includes clamping groove base 31, several H-shaped positioning rods 41 and stainless steel throat clamp 7, the clamping groove base 31 is in contact with the upper surface of pile cap 2 and is connected and fixed with bolt 42, along the length direction of pier, H-shaped positioning rod 41 is installed on clamping groove base 31 until extending above water level, glass steel sand plate 51 is inserted into structural framework along the recess of H-shaped positioning rod 41, bottom surface is embedded in clamping groove base 31, then stainless steel throat clamp 7 is installed equidistantly on the outer surface of reinforcing structure;Between entire reinforcing structure and pier column 1 form accommodating cavity, pre-filled aggregate grouting concrete is poured after drainage in accommodating cavity.The contact part of structural framework and glass steel sand plate 51 is equipped with waterproof rubber strip 44.First, according to the size of existing pier column 1, glass steel sand plate 51 and framework of suitable size are prefabricated, and damaged pier column 1 and pile cap 2 are cleaned and arranged.Then structural framework is assembled and fixed, specifically, H-shaped positioning rod 41 is connected on ground and connected with base 31, then framework structure is sleeved on pier column and is vertically hoisted, and is fixed with bolt after sinking to the surface of pile cap 2.Glass steel sand plate is inserted into the clamping groove of framework in sequence and stainless steel throat clamp 7 is installed equidistantly on the outer surface of reinforcing structure.Finally, after extracting water in accommodating cavity between structure and pier column, pre-filled aggregate grouting concrete is used to pour and maintain in parts.The utility model is economical in material selection, and simple in reinforcing.After pouring concrete, pier column and entire structure form an integral whole, not only can significantly improve the bearing capacity and durability of pier structure, but also greatly improve the corrosion resistance and hydraulic performance of column body.

[0034] The following is further described by specific examples.

[0035] The utility model provides a kind of underwater damaged pier column repair reinforcing structure based on glass steel sand plate, as Figures 1-8As shown, the pier includes pile cap 2 and pier column 1, the pier column 1 is cast on the upper surface of the pile cap 2, the lower end of the pile cap 2 and the pier column 1 is below the water surface, and the upper end of the pier column 1 is above the water surface. The reinforced repair structure includes a structural framework, a glass fiber reinforced plastic sandwich plate 51 and a pre-filled aggregate grouting concrete, the structural framework includes a clamping groove base 31, a plurality of H-shaped positioning rods 41 and a stainless steel throat clamp 7, the clamping groove base 31 is in contact with the upper surface of the pile cap 2 and is fixed by bolt connection, along the length direction of the pier column 1, the H-shaped positioning rod 41 is installed on the clamping groove base 31 until it extends above the water surface, the glass fiber reinforced plastic sandwhich plate 51 is inserted into the structural framework along the groove of the H-shaped positioning rod 41, the bottom surface is embedded in the clamping groove base 31, and then the stainless steel throat clamp 7 is installed equidistantly on the outer surface of the reinforced structure; the entire reinforced structure and the pier column 1 form a containing cavity, and the pre-filled aggregate grouting concrete is poured after draining the containing cavity. The contact part of the structural framework and the glass fiber reinforced plastic sandwhich plate is provided with a waterproof rubber strip 44. The waterproof rubber strip 44 aims to ensure the waterproof effect of the reinforced structure when the glass fiber reinforced plastic sandwhich plate is inserted into the clamping groove of the framework, relying on the elastic extrusion force.

[0036] In a specific embodiment, before the structural framework is sunk, the step of pasting a foam waterproof strip assembly 43 is further included, the foam waterproof strip assembly 43 is pasted on the inner wall of the H-shaped positioning rod 41, and the thickness of the foam waterproof strip assembly 43 is slightly smaller than the thickness of the containing cavity, as shown. Figure 5 When the structural framework is sunk and contacted with water, the BW water-swelling waterproof strip 43b slowly swells when contacted with water, thereby ensuring that the reinforced structure is in close contact with the existing pier column and avoiding displacement.

[0037] In a specific embodiment, the glass fiber reinforced plastic sand-encased plate 51 and the structural framework are made according to the size of the existing pier column 1. The glass fiber reinforced plastic sand-encased plate 51 is shaped as an axially segmented thin-walled cylinder, with a gap reserved between the glass fiber reinforced plastic sand-encased plate 51 and the existing pier column 1. When the loss rate of the cross section of the pier column 1 is less than 25%, in combination with environmental factors such as the category, the outer diameter of the glass fiber reinforced plastic sand-encased plate 51 is 14-20 mm larger than the outer diameter of the pier column 1. When the loss rate of the cross section of the pier column 1 is greater than 25%, the outer diameter of the glass fiber reinforced plastic sand-encased plate 51 is 30-50 mm larger than the outer diameter of the pier column 1. The thickness of the glass fiber reinforced plastic sand-encased plate 51 is 30-50 mm. The longitudinal height of the glass fiber reinforced plastic sand-encased plate 51 is determined according to the water depth. After installation, the top of the plate 51 is 20-40 cm above the water surface. If the space around the part of the pier column 1 above the water surface is limited, the glass fiber reinforced plastic sand-encased plate 51 can be arranged in multiple layers and installed layer by layer. The structural framework includes a clamping groove base 31 and a plurality of H-shaped positioning rods 41, and the materials of the clamping groove base 31 and the H-shaped positioning rods 41 are glass fiber reinforced plastic sand. In this embodiment, the distance between the inner wall of the clamping groove base 31 and the existing pier column 1 is equal along the radial direction of the existing pier column 1. To facilitate connection with the pile cap 2, four appropriate reserved holes 33 are provided at the bottom of the clamping groove. In addition, the thickness of the groove wall 34 should not be too thin, the height of the groove wall 34 should not be too low, and the width of the groove should be slightly larger than the thickness of the glass fiber reinforced plastic sand-encased plate 51. The number of H-shaped positioning rods 41 is determined according to the water level. The connection between each positioning rod, rod member and base is bolted connection. The flange of the H-shaped positioning rod 41 is curved, and the thickness of the flange is greater than 1 / 3 of the cross-sectional height of the rod member. The lower end of the H-shaped positioning rod 41 has a U-shaped iron ring.

[0038] In a specific embodiment, to ensure the integrity, stability and rigidity of the entire structure, stainless steel throat collars 7 are required to be installed equidistantly on the outer surface of the reinforced structure, and the spacing can be selected as 1 m.

[0039] In a specific embodiment, the pre-filled aggregate grouting concrete 6 is poured in sections by pressure pumping method, such as Figure 7The pouring height of the concrete has two options. One option is that the pouring height of the concrete is flush with or slightly lower than the top end of the glass fiber reinforced plastic sand-encased plate 51. The advantage is that the damaged part is repaired and the underwater part of the whole pier column is reinforced, which is a one-time method. Another option is that the pouring height of the concrete is 20-40 cm higher than the top point of the damaged part, that is, only the damaged part and the column below the damaged part of the pier column are repaired and reinforced. The advantage is that the material cost is further saved, and the economy is more prominent. After the concrete is cured, the upper layer of the framework for pouring the concrete and the glass fiber reinforced plastic sand-encased plate 51 are removed for recycling. It should be noted that if the second option is used, the length of the glass fiber reinforced plastic sand-encased plate 51 described above should be adjusted. Specifically, the glass fiber reinforced plastic sand-encased plate 51 is designed as an upper layer and a lower layer. The longitudinal length of the lower layer of the glass fiber reinforced plastic sand-encased plate is controlled to be 200-300 mm higher than the damaged part of the pier column, and then the height of the upper layer of the glass fiber reinforced plastic sand-encased plate is designed to be inserted into the framework, and the overall height after insertion is more than 20 cm above the water surface. The junction of the upper and lower layers of the glass fiber reinforced plastic sand-encased plate uses underwater sealing tape to ensure the sealing property. It should be noted that the concrete cannot overflow the lower layer of the template during pouring, and after the concrete is cured, the upper layer of the template and part of the framework are removed for recycling.

[0040] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and modifications can be made to the embodiments without departing from the principles and spirits of the utility model, and still fall within the protection scope of the utility model.

Claims

1. A repair and reinforcement structure for underwater damaged piers based on fiberglass reinforced plastic (FRP) sandwich panels, comprising a pile cap (2) and a pier (1) cast on the upper surface of the pile cap (2), wherein the lower ends of the pile cap (2) and the pier (1) are below the water surface, and the upper end of the pier (1) is above the water surface, characterized in that: The repair and reinforcement structure comprises a structural framework in contact with the upper surface of the pile cap (2) and fixed by bolt connection, a glass steel sand-embedded plate (51) and a pre-filled aggregate grouting concrete, the structural framework comprises a clamping groove base (31), several H-shaped positioning rods (41) and stainless steel collars (7), the clamping groove base (31) is installed along the length direction of the pier column and extends to above the water surface, the glass steel sand-embedded plate (51) is inserted into the structural framework along the groove of the H-shaped positioning rod (41), the bottom surface is embedded into the clamping groove base (31), and the outer surface of the glass steel sand-embedded plate is equidistantly installed with the stainless steel collars (7); the repair and reinforcement structure and the pier column (1) form a containing cavity, the containing cavity is filled with the pre-filled aggregate grouting concrete from bottom to top after drainage, and the contact parts between the structural framework and the glass steel sand-embedded plate (51) are provided with waterproof rubber strips.

2. The underwater damaged pier column repair and reinforcement structure based on glass steel sandwich plate according to claim 1, characterized in that: The inner wall of the H-shaped positioning rod (41) is provided with a foam water stop strip assembly (43) with a thickness slightly smaller than the containing cavity and ensuring that the reinforcement structure is in close contact with the existing pier column.

3. The underwater damaged pier column repair and reinforcement structure based on glass steel sandwich plate according to claim 1, characterized in that, The inner wall of the clamping groove base is provided with an annular BW water-swelling water stop belt.

4. The underwater damaged pier column repair and reinforcement structure based on glass steel sandwich plate according to claim 1, characterized in that: The length of the single H-shaped positioning rod (41) is 1 m, the connection between the positioning rods, the rod members and the base is bolt (42) connection, the flange of the H-shaped positioning rod (41) is a curved surface, and the flange thickness is greater than 1 / 3 of the height of the rod member section.

5. The underwater damaged pier column repair and reinforcement structure based on glass steel sandwich plate according to claim 1, characterized in that: The glass steel sand-embedded plate (51) is a thin-walled cylindrical axial segmented body, which is inserted into the clamping groove of the framework in sequence after the framework is fixed, so as to form a closed cavity.

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