CN108824230B - Method for reinforcing underwater bridge pier by FRP pipe - Google Patents
Method for reinforcing underwater bridge pier by FRP pipe Download PDFInfo
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- CN108824230B CN108824230B CN201811007181.5A CN201811007181A CN108824230B CN 108824230 B CN108824230 B CN 108824230B CN 201811007181 A CN201811007181 A CN 201811007181A CN 108824230 B CN108824230 B CN 108824230B
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 20
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- 239000010959 steel Substances 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 41
- 230000002787 reinforcement Effects 0.000 claims abstract description 29
- 238000010276 construction Methods 0.000 claims abstract description 27
- 239000000853 adhesive Substances 0.000 claims abstract description 19
- 230000001070 adhesive effect Effects 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 239000003292 glue Substances 0.000 claims abstract description 10
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- 239000004567 concrete Substances 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 3
- 239000004830 Super Glue Substances 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
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- FGBJXOREULPLGL-UHFFFAOYSA-N ethyl cyanoacrylate Chemical compound CCOC(=O)C(=C)C#N FGBJXOREULPLGL-UHFFFAOYSA-N 0.000 claims description 3
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- 239000004814 polyurethane Substances 0.000 claims description 3
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A method for reinforcing an underwater bridge pier by using an FRP pipe comprises the steps of installing a positioning piece, wrapping a steel wire mesh, manufacturing a self-locking type FRP pipe, winding the self-locking type FRP pipe, solidifying a connecting part of the self-locking type FRP pipe, activating a bottom seal and pouring filling materials to realize the reinforcement of the underwater bridge pier, fastening the self-locking type FRP pipe by a movable clamp of the self-locking type FRP pipe, injecting an underwater adhesive into a glue injection cavity of the movable clamp to enable the self-locking type FRP pipe to be bonded into a whole, and injecting the filling materials into a gap formed between the self-locking type FRP pipe and the bridge pier to be reinforced to finish the reinforcement of the underwater bridge pier. The self-locking FRP pipe is simple in process, one-time fastening is achieved, no binding belt is needed, construction procedures are reduced, corrosion resistance is good, cofferdam and templates are not needed, labor intensity of workers is reduced, the self-locking FRP pipe can be directly reinforced under water, influence on a channel is reduced, applicability is wide, and construction is rapid and convenient.
Description
Technical Field
The invention relates to a method for reinforcing an underwater structure of a bridge, in particular to a method for reinforcing an underwater pier of the bridge by using an FRP pipe, and belongs to the technical field of civil engineering.
Background
As a large number of countries in rivers and lakes, a large number of railway bridges and highway bridges connect land traffic into a network, various problems are continuously emerging along with the increase of bridge operation time and the increase of traffic volume, and compared with a bridge upper structure, the damage of a lower underwater structure is more common and is not easy to be found, the load caused by higher static stress under water, water flow impact, ship impact, erosion, freezing and thawing cycles in severe cold areas and the like is easy to cause the formation of the damage of the bridge underwater structure, such as spalling of a concrete protection layer, cracks, exposed tendons, corrosion of reinforcing steel bars, undercut of a river bed and the like, and the damage can lead to the reduction of bridge bearing capacity, durability and service life, so that the driving safety is seriously endangered. The bridge pier is used as a main support of a main bridge structure, and once diseases occur in bridge operation, the bridge pier can severely limit the exertion of related functions of the bridge, and even the bridge collapses due to insufficient bearing capacity.
The underwater bridge pier is inconvenient to carry out large-scale periodic maintenance, diseases can not be found timely, the lower structural safety coefficient in bridge design is larger in value and is regarded as a safer part, later-stage safety inspection is often ignored, the diseases are not treated timely, and the method has important significance in the research of the reinforcement technology of the underwater bridge pier due to the difficulty in underwater environment construction operation and the specific applicability of the treatment method. The common bridge pier reinforcement method mainly comprises a cross section increasing reinforcement method, a bonding steel reinforcement method, an external prestress reinforcement method, a wire winding reinforcement method and the like, wherein the structural reinforcement effect of the methods plays a certain role in practical engineering, but the respective defects exist, the construction period of the cross section increasing reinforcement method is longer, the field wet operation is more, and the influence on the surrounding environment is great; the bonding steel reinforcement method has higher requirements on the strength of matrix concrete, and the reinforcement quality is greatly dependent on the quality of cementing materials and the construction process level; the construction process of the external prestress reinforcement method is complex, and the prestress loss is large; the wire winding reinforcement method also has the problems of complex construction process and the like when underwater construction is not performed.
FRP (fiber reinforced composite) has good application prospect in the civil engineering field due to the advantages of light weight, corrosion resistance, easy molding and the like. The FRP pipe constraint reinforced concrete can effectively improve the bearing capacity, the ductility, the anti-seismic performance and the durability of the structural member. Based on the special properties of the material, the FRP pipe is applied to reinforcement of some special environment structures, and has good application prospect. The invention provides a method for reinforcing an underwater bridge pier by using an FRP pipe, which utilizes self-locking fixation of the self-locking FRP pipe to realize the reinforcement of the underwater bridge pier of the bridge, and has the advantages of simple process, quick and convenient construction and good reinforcement effect.
Disclosure of Invention
The invention aims to provide a method for reinforcing an underwater bridge pier of a bridge by using an FRP pipe, wherein the self-locking type FRP pipe is clamped by a self-contained movable clamp, is fixed by glue injection, does not need a binding belt, reduces construction procedures, can effectively improve the bearing capacity, ductility, durability and earthquake resistance of a structural member after reinforcing the bridge pier based on the advantages of light weight, corrosion resistance, easiness in forming and the like of an FRP material, does not need a cofferdam or a large-scale steel template in the construction process, reduces the labor intensity of workers, has a simple process, can be directly reinforced underwater, reduces the influence on a channel, has wide applicability and is rapid and convenient to construct.
The technical scheme of the invention is as follows: a method for reinforcing an underwater bridge pier by using an FRP pipe comprises the steps of installing a positioning piece, wrapping a steel wire mesh, manufacturing a self-locking type FRP pipe, winding the self-locking type FRP pipe, solidifying a connecting part of the self-locking type FRP pipe, activating a bottom seal, pouring filling materials to realize the reinforcement of the underwater bridge pier, arranging a limit cushion block, a movable clamp and the bottom seal on the self-locking type FRP pipe, realizing the underwater convenient assembly of the FRP pipe, integrating a template and the reinforcing materials into a whole, and avoiding drainage work; the construction method is characterized by comprising the following construction steps:
A. treating the surface of a pier to be reinforced: setting up a construction platform in a construction area, and cleaning weak layers on the surface of the pier to be reinforced, attached silt and other impurities by divers until a solid surface is exposed;
B. manufacturing a steel wire mesh and a fixed positioning piece: manufacturing a steel wire mesh according to the size and specification of the design requirement, discretely fixing positioning pieces on the steel wire mesh, wherein the positioning pieces are positioned in the steel wire mesh, the thickness of the positioning pieces is determined by the size of a gap between the steel wire mesh and a pier to be reinforced, and the arrangement range is one time of the perimeter range of the pier to be reinforced;
C. wrapping the steel wire mesh: more than one layer of steel wire mesh is circumferentially wound on the pier to be reinforced under water according to the size required by design, one side of the positioning piece is provided with the inner side to be tightly attached to the surface of the pier to be reinforced, a certain gap exists between the steel wire mesh and the pier to be reinforced according to the positioning of the positioning piece, the overlapping length of the steel wire mesh along the circumferential direction is not less than 300mm, and the overlapping parts are in buckling connection by adopting steel wire buckles;
D. manufacturing a self-locking FRP pipe: the shell of the self-locking FRP pipe is formed by more than one layer of fiber cloth paving gum dipping hand paste, mould pressing or vacuum auxiliary forming process, one end of the shell of the self-locking FRP pipe is a fixed end, a movable clamp is arranged, the movable clamp consists of a gum injecting cavity, a base, a pressing plate and a bolt, and the other end of the shell is a movable end; the inner side of the shell is provided with a limit cushion block in a discrete manner, the thickness dimension of the limit cushion block is determined by the total thickness of the filling material, the lower edge of the shell is provided with a bottom seal which is not less than the circumferential perimeter of the pier to be reinforced, and the bottom seal is wrapped by a waterproof film in advance;
E. winding self-locking FRP pipe: sending the prefabricated self-locking FRP pipe to an underwater preset position by equipment, circumferentially winding the self-locking FRP pipe around the periphery of a steel wire mesh by an underwater professional worker, penetrating the movable end of the wrapped shell between a pressing plate and a base of a movable clamp at the other end, tightening the movable end of the shell, and compacting a bottom seal and a limiting cushion block, wherein the extension length is not less than 100cm;
F. consolidation self-locking FRP pipe connection part: bolts on the movable clamp are symmetrically screwed up and down by underwater professional staff, so that the pressing plate is tightly pressed against the base, the movable end of the anchoring shell is fixed, and underwater adhesive is injected into the adhesive injection cavity between the pressing plate and the base for solidification, so that the shell is annularly bonded into a whole;
G. activating a bottom seal: after the underwater adhesive is solidified, the waterproof film of the bottom seal is removed, the bottom seal fully seals the gap between the self-locking FRP pipe and the bottom of the pier to be reinforced after being expanded by water, so as to form a cavity with a sealed bottom and an open top, and the thickness of the cavity is the thickness of the reinforcing layer;
H. filling a filling material: filling materials are pressed in a cavity between the self-locking FRP pipe and the pier to be reinforced through grouting equipment, and the pressing-in process is continuously and stably carried out until the whole cavity is filled tightly;
I. and (3) finishing reinforcement: and after the filled filling material reaches the specified strength, the reinforcement of the underwater bridge pier of the bridge is completed.
The movable clamp is made of metal materials, the lower end of the base is closed, the upper end of the base is opened, the left side and the right side of the base are provided with notches, the pressing surface of the base and the pressing plate are simultaneously provided with corresponding convex racks and notch structures, the plurality of notch structures are located between the adjacent convex racks, the pressing plate can move and press the base along with the screwing of bolts, the height of the convex racks is larger than that of the notch structures, and after the convex racks are pressed, a glue injection cavity is formed between the pressing plate and the adjacent convex racks between the base.
The self-locking FRP pipe consists of a shell, a limiting cushion block, a movable clamp and a bottom seal, wherein the fixed end of the shell is fixedly bonded with the base of the movable clamp in advance, and the movable end of the shell penetrates through the space between the pressing plate of the movable clamp and the base, and the extending length of the movable end of the shell is not less than 100cm.
The material of the bottom seal is preferably water-swelling material, which is sealed by a waterproof film in advance and is arranged along the lower edge of the shell of the self-locking FRP pipe.
The score configuration is preferably bi-directional, pit or floating point.
The underwater adhesive is preferably an underwater epoxy resin adhesive, a polyurethane adhesive or a cyanoacrylate adhesive; the locating piece and the limit cushion block are made of one of plastics, composite materials, cement-based materials and metal materials.
The steel wire mesh is stainless steel wire mesh or galvanized steel wire mesh; the filling material is one of underwater epoxy resin, underwater undispersed mortar, underwater epoxy resin mortar, underwater undispersed concrete or underwater epoxy resin concrete.
The winding shape of the self-locking FRP pipe is one of a circle or a polygon.
In the structure of the invention, the self-locking FRP pipe and the steel wire mesh are made to wrap the underwater pier by utilizing the characteristics of light weight, high strength, corrosion resistance and the like of the FRP material, and filling materials are poured into the gaps, so that the maintenance and reinforcement of the bridge underwater pier are realized under the condition of no drainage, the self-locking FRP pipe is connected into a pipe through a movable clamp, meanwhile, the underwater adhesive is injected into the glue injection cavity formed between the pressing plate and the base to tightly fix the self-locking FRP pipe, the process is simple, the one-step molding is realized, and the bearing capacity, the rigidity and the ductility of the whole structure are improved by the existence of the steel wire mesh.
The construction process of the invention does not need cofferdam and large-scale steel template, reduces the labor intensity of workers, can directly strengthen underwater, reduces the influence on the channel, has wide applicability and is quick and convenient in construction. The invention has the following beneficial effects:
(1) From locking-type FRP pipe from taking movable clamp, movable clamp presss from both sides the casing of arbitrary thickness, and application scope is wide, need not outside ribbon and fixes in advance, and the clamp plate is once in place with the underwater adhesive in the injecting glue cavity, and dual fastening, reinforcement effect is excellent.
(2) The self-locking FRP pipe material has the excellent performances of light weight, high strength, corrosion resistance and the like, simultaneously omits the arrangement of a large steel template, can be directly used as an outer template when filling materials, does not need to consider the problems of turnover use of the template and the like, greatly shortens the construction period and saves the cost.
(3) The bottom seal adopts a water-swelling material to wrap the waterproof film in advance, and is activated before filling the filling material after the self-locking FRP pipe is fixed, so that the function of sealing and stopping water at fixed time is realized, and the influence of the pre-swelling on the thickness of the reinforcing layer can be prevented.
(4) The construction process is simple, the erection of a large-scale construction platform and a cofferdam is not needed, the underwater reinforcement under the condition of no drainage is realized, the influence of the construction process on the channel is small, and the progress of the whole project is ensured.
(5) The bearing capacity, corrosion resistance, ductility and earthquake resistance of the pier to be underwater are effectively improved, the applicability is wide, and the used materials are suitable for underwater environments.
Description of the drawings:
FIG. 1 is a structural anatomic diagram of an FRP pipe completed to strengthen an underwater pier of a bridge;
FIG. 2 is a process flow diagram of a method for reinforcing an underwater pier of a bridge by FRP pipes;
FIG. 3 is a schematic perspective view of a wire mesh with a retainer installed;
FIG. 4 is an elevational schematic view of an underwater wrapped steel mesh;
FIG. 5 is a schematic perspective view of a self-locking FRP pipe with a bottom seal;
FIG. 6 is a schematic view of a structural elevation of a wrapped and glue-injected fixed self-locking FRP pipe;
FIG. 7 is a schematic elevational view of the structure of the activated bottom seal;
FIG. 8 is a schematic structural elevation of a process of pouring a filler material;
FIG. 9 is a schematic elevation view of the underwater pier of the bridge after finishing the reinforcement;
FIG. 10 is a schematic view of a part of the movable clamp of FIG. 5A in an enlarged configuration;
FIG. 11 is a schematic view of a partially enlarged structure of the movable clamp-bonded self-locking FRP pipe of FIG. 9B;
FIG. 12 is a schematic view of a circular cross section of a reinforced finished bridge underwater pier;
FIG. 13 is a schematic view of a rectangular cross section of an underwater pier of the reinforced bridge;
in all the drawings, 1 is a self-locking FRP pipe; 11 is a shell; 12 is a limit cushion block; 2 is a movable clamp; 21 is a base; 22 is a press plate; 23 is a bolt; 20 is a glue injection cavity; 201 is a convex rack; 202 is a scored configuration; 3 is a steel wire mesh; 31 is a positioning piece; 4 is a bottom seal; 5 is a pier to be reinforced; 6 is a filling material; 7 is an underwater adhesive.
The specific embodiment is as follows:
for a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings. The invention provides a method for reinforcing an underwater bridge pier by an FRP pipe, which comprises the steps of installing a positioning piece 31, wrapping a steel wire mesh 3, manufacturing a self-locking type FRP pipe 1, winding the self-locking type FRP pipe 1, solidifying the connecting part of the self-locking type FRP pipe 1, activating a bottom seal 4 and pouring a filling material 6 to reinforce the underwater bridge pier, wherein the self-locking type FRP pipe 1 is provided with a limit cushion block 12, a movable clamp 2 and the bottom seal 4 to realize the underwater convenient assembly of the FRP pipe, and the template and the reinforcing material are integrated into a whole to avoid drainage work; the construction method is characterized by comprising the following construction steps:
A. treating the surface of a pier to be reinforced: setting up a construction platform in a construction area, and cleaning a weak layer, attached silt and other impurities on the surface of the pier 5 to be reinforced by divers until a solid surface is exposed;
B. manufacturing a steel wire mesh and a fixed positioning piece: manufacturing a steel wire net 3 according to the size and specification of the design requirement, discretely fixing positioning pieces 31 on the steel wire net 3, wherein the positioning pieces 31 are positioned in the steel wire net 3, the thickness of the positioning pieces 31 is determined by the size of a gap between the steel wire net 3 and the pier 5 to be reinforced, and the arrangement range is one time the perimeter range of the pier 5 to be reinforced;
C. wrapping the steel wire mesh: more than one layer of steel wire mesh 3 is wound on the pier 5 to be reinforced under water in a circumferential direction according to the size required by design, one side of the positioning piece 31 is arranged to be the inner side to be tightly attached to the surface of the pier 5 to be reinforced, a certain gap exists between the steel wire mesh 3 and the pier 5 to be reinforced according to the positioning of the positioning piece 31, the overlapping length of the steel wire mesh 3 along the circumferential direction is not less than 300mm, and the overlapping position is in buckle connection by adopting steel wire buckles;
D. manufacturing a self-locking FRP pipe: the shell 11 of the self-locking FRP pipe 1 is formed by more than one layer of fiber cloth paving gum dipping hand paste, mould pressing or vacuum auxiliary forming process, one end of the shell 11 of the self-locking FRP pipe 1 is a fixed end, a movable clamp 2 is arranged, the movable clamp 2 consists of a gum injecting cavity 20, a base 21, a pressing plate 22 and a bolt 23, and the other end of the shell 11 is a movable end; the inner side of the shell 11 is provided with a limit cushion block 12 in a discrete manner, the thickness dimension of the limit cushion block is determined by the total thickness of the filling material 6, the lower edge of the shell 11 is provided with a bottom seal 4 which is not smaller than the circumferential circumference of the pier 5 to be reinforced, and the bottom seal 4 is wrapped by a waterproof film in advance;
E. winding self-locking FRP pipe: the prefabricated self-locking FRP pipe 1 is sent to a preset underwater position by equipment, underwater professional staff winds the self-locking FRP pipe 1 around the periphery of the steel wire mesh 3 in a circumferential direction, the movable end of the wrapped shell 11 penetrates through between the pressing plate 22 and the base 21 of the movable clamp 2 at the other end, the movable end of the shell 11 is tightened, the bottom seal 4 and the limiting cushion block 12 are pressed, and the extending length is not less than 100cm;
F. consolidation self-locking FRP pipe connection part: bolts 23 on the movable clamp 2 are symmetrically screwed up and down by underwater professional staff, so that the pressing plate 22 is tightly pressed against the base 21, the movable end of the anchoring shell 11 is fixed, and the underwater adhesive 7 is injected into the glue injection cavity 20 between the pressing plate 22 and the base 21 for solidification, so that the shell 11 is bonded into a whole in the circumferential direction;
G. activating a bottom seal: after the underwater adhesive 7 is solidified, the waterproof film of the bottom seal 4 is removed, the bottom seal 4 fully seals the gap between the self-locking FRP pipe 1 and the bottom of the pier 5 to be reinforced after being expanded by water, a cavity with a sealed bottom and an open top is formed, and the thickness of the cavity is the thickness of the reinforcing layer;
H. filling a filling material: filling material 6 is pressed in a cavity between the self-locking FRP pipe 1 and the pier 5 to be reinforced through grouting equipment, and the pressing process is continuously and stably carried out until the whole cavity is filled tightly;
I. and (3) finishing reinforcement: and after the filling material 6 to be poured reaches the specified strength, the reinforcement of the underwater bridge pier of the bridge is completed.
The movable clamp 2 is made of metal materials, the lower end of the base 21 is closed, the upper end of the base is open, notches are formed in the left side and the right side, corresponding convex racks 201 and notch structures 202 are arranged on the pressing surface of the base 21 and the pressing plate 22, the notch structures 202 are located between the adjacent convex racks 201, the pressing plate 22 can move and press the base 21 along with screwing of bolts 23, the height of the convex racks 201 is larger than that of the notch structures 202, and after the convex racks 201 are pressed, a glue injection cavity 20 is formed between the pressing plate 22 and the adjacent convex racks 201 between the base 21.
The self-locking FRP pipe 1 consists of a shell 11, a limit cushion block 12, a movable clamp 2 and a bottom seal 4, wherein the fixed end of the shell 11 is fixedly bonded with a base 21 of the movable clamp 2 in advance, and the movable end of the shell 11 penetrates through the space between a pressing plate 22 and the base 21 of the movable clamp 2 extending into the fixed end, and the extending length is not less than 100cm.
The material of the bottom seal 4 is preferably a water-swelling material, which is sealed by a waterproof film in advance, and is arranged along the lower edge of the shell 11 of the self-locking FRP pipe 1.
The score formation 202 is preferably in the form of bi-directional scores, pits, or floating points.
The underwater adhesive 7 is preferably an underwater epoxy resin adhesive, a polyurethane adhesive or a cyanoacrylate adhesive; the positioning piece 31 and the limit cushion block 12 are made of one of plastic, composite material, cement-based material and metal material.
The steel wire mesh 3 is a stainless steel wire mesh 3 or a galvanized steel wire mesh 3; the filling material 6 is one of underwater epoxy resin, underwater undispersed mortar, underwater epoxy resin mortar, underwater undispersed concrete or underwater epoxy resin concrete.
The winding shape of the self-locking FRP pipe 1 is one of a circle and a polygon.
Claims (6)
1. A method for reinforcing an underwater bridge pier by using an FRP pipe comprises the steps of installing a positioning piece, wrapping a steel wire mesh, manufacturing a self-locking type FRP pipe, winding the self-locking type FRP pipe, solidifying a connecting part of the self-locking type FRP pipe, activating a bottom seal, pouring filling materials to realize the reinforcement of the underwater bridge pier, arranging a limit cushion block, a movable clamp and the bottom seal on the self-locking type FRP pipe, realizing the underwater convenient assembly of the FRP pipe, integrating a template and the reinforcing materials into a whole, and avoiding drainage work; the construction method is characterized by comprising the following construction steps:
A. treating the surface of a pier to be reinforced: clearing the weak layer, the attached silt and other impurities on the surface of the pier (5) to be reinforced by divers until the solid surface is exposed;
B. manufacturing a steel wire mesh and a fixed positioning piece: manufacturing a steel wire mesh (3) according to the size and specification required by design, discretely fixing positioning pieces (31) on the steel wire mesh (3), wherein the positioning pieces (31) are positioned in the steel wire mesh (3), the thickness of the positioning pieces (31) is determined by the size of a gap between the steel wire mesh (3) and a pier (5) to be reinforced, and the arrangement range is one time the perimeter range of the pier (5) to be reinforced;
C. wrapping the steel wire mesh: more than one layer of steel wire mesh (3) is annularly wound on the pier (5) to be reinforced under water, one side of the positioning piece (31) is arranged to be the inner side to be tightly attached to the surface of the pier (5) to be reinforced, a certain gap exists between the steel wire mesh (3) and the pier (5) to be reinforced according to the positioning of the positioning piece (31), the overlapping length of the steel wire mesh (3) along the annular direction is not less than 300mm, and the overlapping position is in buckling connection by adopting steel wire buckles;
D. manufacturing a self-locking FRP pipe: the shell (11) of the self-locking FRP pipe (1) is formed by more than one layer of fiber cloth paving gum dipping hand paste, mould pressing or vacuum auxiliary forming process, one end of the shell (11) of the self-locking FRP pipe (1) is a fixed end, a movable clamp (2) is arranged, the movable clamp (2) consists of a gum injection cavity (20), a base (21), a pressing plate (22) and a bolt (23), and the other end of the shell (11) is a movable end; the inner side of the shell (11) is discretely provided with a limit cushion block (12), the thickness dimension of the limit cushion block is determined by the total thickness of the filling material (6), the lower edge of the shell (11) is provided with a bottom seal (4) which is not smaller than the circumferential circumference of the pier (5) to be reinforced, and the bottom seal (4) is wrapped by a waterproof film in advance; the movable clamp (2) is made of metal materials, the lower end of the base (21) is closed, the upper end of the base is open, notches are formed in the left side and the right side, the base (21), the pressing surface of the pressing plate (22) and the pressing plate (22) are simultaneously provided with corresponding convex racks (201) and notch structures (202), the plurality of notch structures (202) are located between the adjacent convex racks (201), the pressing plate (22) can move and press the base (21) along with the screwing of the bolts (23), the height of the convex racks (201) is larger than that of the notch structures (202), and after the convex racks (201) are pressed, a glue injection cavity (20) is formed between the pressing plate (22) and the adjacent convex racks (201) between the base (21);
E. winding self-locking FRP pipe: the self-locking FRP pipe (1) is wound around the periphery of the steel wire mesh (3) in a circumferential direction, the movable end of the wrapped shell (11) penetrates through the space between the pressing plate (22) of the movable clamp (2) at the other end and the base (21), the movable end of the shell (11) is tightened, and the bottom seal (4) and the limit cushion block (12) are pressed; the self-locking FRP pipe (1) consists of a shell (11), a limit cushion block (12), a movable clamp (2) and a bottom seal (4), wherein the fixed end of the shell (11) is fixedly bonded with a base (21) of the movable clamp (2) in advance, and the movable end of the shell (11) penetrates through a part between a pressing plate (22) of the movable clamp (2) extending into the fixed end and the base (21), and the extending length is not less than 100cm;
F. consolidation self-locking FRP pipe connection part: bolts (23) on the movable clamp (2) are symmetrically screwed, so that the pressing plate (22) is tightly pressed against the base (21), the movable end of the anchoring shell (11) is fixed, and the underwater adhesive (7) is injected into the adhesive injection cavity (20) between the pressing plate (22) and the base (21) for solidification, so that the shell (11) is annularly bonded into a whole;
G. activating a bottom seal: after the underwater adhesive (7) is solidified, the waterproof film of the bottom seal (4) is removed, and after the bottom seal (4) swells with water, the gap at the bottom of the self-locking FRP pipe (1) and the pier (5) to be reinforced is completely closed to form a cavity with sealed bottom and open top;
H. filling a filling material: filling materials (6) are pressed into a cavity between the self-locking FRP pipe (1) and the pier (5) to be reinforced through grouting equipment until the whole cavity is filled tightly;
I. and (3) finishing reinforcement: and after the filling material (6) to be poured reaches the specified strength, the reinforcement of the underwater bridge pier of the bridge is completed.
2. A method for reinforcing an underwater bridge pier of a bridge of the type as claimed in claim 1, characterized in that said material of said bottom seal (4) is preferably a water-swellable material, which is previously sealed with a water-barrier film, disposed along the lower edge of the shell (11) of the self-locking FRP pipe (1).
3. A method of reinforcing an underwater pier for a bridge as claimed in claim 2, characterized in that said scoring formations (202) are preferably in the form of bi-directional scores, pits or floating points.
4. A method for reinforcing an underwater pier of a bridge with FRP pipe according to claim 1, characterized in that the said underwater adhesive (7) is preferably an underwater epoxy, polyurethane or cyanoacrylate adhesive; the positioning piece (31) and the limit cushion block (12) are made of one of plastic, composite material, cement-based material and metal material.
5. A method for reinforcing an underwater pier of a bridge by using an FRP pipe according to claim 1, characterized in that the steel wire mesh (3) is a stainless steel wire mesh or a galvanized steel wire mesh; the filling material (6) is one of underwater epoxy resin, underwater undispersed mortar, underwater epoxy resin mortar, underwater undispersed concrete or underwater epoxy resin concrete.
6. The method for reinforcing an underwater pier of a bridge by using an FRP pipe according to claim 1, wherein the winding shape of the self-locking type FRP pipe (1) is one of a circle and a polygon.
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| CN109516726A (en) * | 2018-11-21 | 2019-03-26 | 中国电建集团成都勘测设计研究院有限公司 | Sealing off and covering anchorage material suitable for flow turbulence area anchor cable |
| CN109557184A (en) * | 2019-01-15 | 2019-04-02 | 福州大学 | For bridge pier sensor laying and method that stabilization by drainage construction quality monitors |
| CN110344340B (en) * | 2019-08-07 | 2024-01-05 | 湖南科技大学 | Reinforcing device for reinforcing pier by cofferdam-free underwater cross section increasing method and construction method thereof |
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