A self-prestressed steel wire mesh reinforcement construction method

Abstract

The present invention discloses a self-prestressed wire rope mesh reinforcement construction method, in which a temporary fixing device is used to make the anchor vertically close to the facade of the pier, and a plurality of wire ropes are sequentially passed through the anchor from top to bottom around the pier; a tensioning device is used to simultaneously tighten the plurality of wire ropes, so that one end of the wire rope is clamped on one side of the anchor, and the other end passes through the other side of the anchor and is self-prestressed; the reinforced surface is dusted and cleaned, and permeable polymer mortar is applied, and the polymer mortar is applied in layers, and watering and curing are performed after the polymer mortar construction is completed. This reinforcement construction method will not damage the main structure of the pier for a second time during the reinforcement process, and there is no need to drill holes on the pier, so as to avoid causing further damage to the severely damaged parts and reduce the load on the severely damaged parts. Subsequently, the coating of polymer mortar can fill and restore the severely damaged parts, so that the pier can restore its original structure and continue to be used.

Description

Technical Field

[0001] The invention relates to the technical field of bridge reinforcement and repair, and in particular to a self-pretensioned steel wire rope mesh reinforcement construction method. Background Art

[0002] Bridge piers will be damaged during long-term use. For general cracks and exposed reinforcement problems, they can be repaired using wire mesh and mortar. For slightly more serious damage, they can be reinforced with prestressed steel wire ropes.

[0003] For example, the Chinese invention patent application (publication number: CN112459518A) discloses a reinforcement process for a concrete circular tower column. For severely cracked areas, prestressed steel wire ropes are added for reinforcement, and each layer of circumferential prestressed steel wire ropes is tensioned in multiple sections; for areas with slight cracks on the surface of the tower column, FRP grids are used for reinforcement. Although these two reinforcement methods can deal with most bridge pier repair problems, this method still has shortcomings for bridge piers with severe through-type cracks or large areas of original structural damage. Since the original structure is severely damaged, it is not suitable to perform operations such as drilling and planting steel bars on the original structure, which will further aggravate the damage to the original structure and affect the stress of the original structure; and for severely damaged bridge piers, segmented steel wire ropes are used for tensioning, which makes it difficult to find multiple good stress points, and too many segments will also increase the difficulty of synchronous construction.

[0004] Another example is the pre-tensioned wire rope mesh-polymer mortar outer layer reinforcement method disclosed in the Chinese invention patent application (publication number: CN101892748A), which uses wire ropes for reinforcement, but the ends of the wire ropes need to be fixed on the fixing plates, and the rope ends and the fixing plates of the wire ropes need to be fixed on the reinforced components, and the anchoring method of opening is also used for fixing, which damages the original structure; a fast prestressed FRP grid reinforcement method disclosed in the Chinese invention patent (publication number: CN111502326A) uses grids for reinforcement, but the two ends of the grids are also connected by anchors fixed on the reinforced components, and this structure does not have a self-pretightening effect and is not suitable for repairing severe through-type damage. Summary of the invention

[0005] The purpose of the present invention is to provide a self-prestressed steel wire rope mesh reinforcement construction method in view of the problems existing in the prior art.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A self-prestressed steel wire rope mesh reinforcement construction method comprises the following steps:

[0008] (1) Clean the bridge piers, identify the severely damaged parts of the piers, and determine the reinforcement surfaces;

[0009] (2) Take an anchor and place the anchor vertically close to the outer surface of the pier through a temporary fixing device. Pass a plurality of steel wire ropes through the anchor from top to bottom. The steel wire ropes pass through one side of the anchor and go around the outer surface of the pier for one circle before returning to the anchor and passing through again.

[0010] (3) After the plurality of steel wire ropes are successively threaded, the area surrounded by the steel wire ropes covers the severely damaged part of the bridge pier; the plurality of steel wire ropes are simultaneously tightened by the tensioning device, so that one end of the steel wire rope is clamped on one side of the anchor, and the other end is passed through the other side of the anchor and self-pretensioned; at this time, the tensioning device and the temporary fixing device are removed, and the anchor and the plurality of steel wire ropes surround the bridge pier without damaging the bridge pier structure;

[0011] (4) After the installation of the steel wire rope is completed and before the base slurry is sprayed, the reinforcement surface is cleaned and dusted, the dust on the surface of the reinforcement base is blown away, and the surface is moistened with water, and then the cleaning glue is applied;

[0012] (5) Apply the permeable polymer mortar in layers. After the polymer mortar construction is completed, watering and curing shall be carried out. The curing time shall not be less than 7 days.

[0013] This reinforcement construction method can use the anchor and the steel wire rope to reinforce the severely damaged bridge piers. During the reinforcement process, the main structure of the bridge pier will not be damaged again, and there is no need to drill holes on the bridge pier to form a connection structure, so as to avoid causing further damage to the severely damaged parts, reduce the load on the severely damaged parts, and facilitate the repair of the severely damaged parts. Subsequently, the coating of polymer mortar can fill and restore the severely damaged parts, so that the bridge pier can restore its original structure and continue to be used. This method is suitable for the repair and reinforcement of severely damaged bridge piers, such as large-area through-type large cracks and gaps.

[0014] This reinforcement construction method gathers the tensioning end and the anchoring end of the steel wire rope at one place (on the same anchor) for self-pretensioning. Multiple steel wire ropes can be tensioned using the same set of anchors. There is no need to set a fixing plate / fixer on the concrete body of the pier, and the concrete body of the pier is not damaged (no drilling, planting reinforcement, etc. is required). This overcomes the disadvantage of having a high grade requirement for the concrete of the pier.

[0015] The self-prestressed wire rope mesh reinforcement construction method also has the advantages of convenient construction, good construction effect, excellent corrosion resistance, good tensile performance of wire rope, good permeability of polymer mortar, little impact on structural shape and appearance, good durability and economy, etc.; it has very good economic benefits, which are mainly reflected in two aspects. First, the material cost used in this reinforcement construction method is not higher than the cost of wire rope or wire mesh, etc. Second, for the reinforced bridge piers, the bridge piers that are difficult to repair and need to be demolished can be repaired and continued to be used, thereby reducing the project cost.

[0016] The temporary fixing device and the tensioning device are both reusable, and are used to assist in supporting the anchor and tensioning the steel wire rope during the construction process. When the anchor and several of the steel wire ropes are tensioned and taut, a circumferential reinforcement system can be formed at the severely damaged parts of the pier, thereby protecting the pier as a whole. At this time, the temporary fixing device and the tensioning device can be removed without affecting the tightening effect of the steel wire rope.

[0017] Furthermore, the temporary fixing device is a crane and a positioning bracket. After the crane lifts the anchor from above and the positioning bracket supports and fixes the anchor from below, it is close to the facade of the pier and keeps the position unchanged.

[0018] On the one hand, the crane adjusts the anchor to the top of the positioning bracket and makes the inner side of the anchor close to the outer surface of the pier. The close-fitting position can be selected from relatively complete positions on both sides to facilitate the leading out and pulling of the steel wire rope. On the other hand, the crane and the positioning bracket temporarily fix the anchor, so as to ensure that the anchor does not move with the tensioning of the steel wire rope.

[0019] Furthermore, when threading the steel wire rope, a spiral staggered threading method is adopted; the head and tail of the same steel wire rope are staggered up and down on the anchor, the vertical spacing between the head and tail of the same steel wire rope is 2-5cm, and the vertical spacing between adjacent steel wire ropes is 3-10cm.

[0020] The steel wire rope is connected in a slightly spirally wound manner, so that the head and tail of the steel wire rope are in the same vertical plane, that is, the distance between the steel wire rope and the outer surface of the pier is basically consistent, which is conducive to stable clamping and balanced force.

[0021] Furthermore, when the steel wire rope is synchronously tensioned, a synchronous guide device is provided on one side of the pier, and the synchronous guide device includes a bracket, and a plurality of pulleys are sequentially provided on the bracket from top to bottom, and the pulleys are respectively connected with traction ropes, and one end of the traction rope is detachably connected to the end of the steel wire rope, and the other end is connected to the tensioning device, and the tensioning device is a drawing machine or a traction machine.

[0022] The setting of the synchronous guide device is conducive to pulling the steel wire rope simultaneously and synchronously, and when pulling the steel wire rope, the traction force for the steel wire rope is basically horizontal, which is conducive to balanced force application and reduces the offset fluctuation of the anchor position caused by pulling the steel wire rope up and down; the setting of the pulley and the traction rope can divide the main traction force concentrated at one point into several horizontal traction forces for pulling, so as to try to tighten the steel wire ropes simultaneously and synchronously.

[0023] Furthermore, a pair of clamping arms is provided in the upper middle portion of the bracket, and the pulley is installed between the pair of clamping arms; the clamping arms are provided with a plurality of connecting grooves in sequence from top to bottom, and the plurality of connecting grooves are respectively connected to the vertical conversion grooves, and both ends of the pulley are arranged in the connecting grooves; when pulling the steel wire rope, the height position of the pulley is adjusted so that the pulling rope and the steel wire rope are connected horizontally one by one.

[0024] By setting the connection slot and the conversion slot, the position of the pulley can be adjusted according to the actual situation, so that each pulley and the corresponding steel wire rope are basically at the same height. The bracket itself can also be set as a telescopic bracket to adjust the height position; the bracket and the positioning bracket of the temporary fixing device can be temporarily fixed on the ground structure by fasteners to provide a stable vertical support effect.

[0025] Furthermore, the wire rope includes a wire rope body, and a limiting end and an insertion end arranged at both ends of the wire rope body, the circumferential size of the limiting end is larger than the circumferential size of the wire rope body and is gradually enlarged at the transition point, and the part of the wire rope body close to the insertion end is provided with a plurality of one-way biting teeth or snap-on steel balls, and the insertion end is also provided with a connecting hole.

[0026] The two ends of the steel wire rope are set differently to facilitate fixing the two ends separately. The limiting end will automatically clamp in the connecting hole of the anchor under the action of tension, and the plug-in end is convenient to pass through the anchor and connect the traction rope. The one-way engaging teeth on the steel wire rope body can cooperate with the limiting part in the anchor to complete the one-way locking operation.

[0027] Furthermore, the steel wire rope is provided with a plurality of rolling support assemblies, the rolling support assemblies include a rolling bracket connected to the steel wire rope, and the rolling bracket is provided with a roller; when the steel wire rope is tensioned, the roller abuts against the outer facade of the pier to provide support force for the steel wire rope.

[0028] The setting of the rolling support assembly facilitates the movement of the steel wire rope along the periphery of the pier when the steel wire rope is tightened, thereby improving the smoothness of movement, and can support the steel wire rope so that a certain distance is maintained between the steel wire rope and the pier, thereby reducing the frictional contact between the steel wire rope and the pier; the existence of these distances can also facilitate the subsequent polymer mortar construction and facilitate the interface treatment of the reinforced surface.

[0029] Furthermore, a lifting ring is provided at the upper end of the anchor, and a plurality of transversely penetrating tensioning holes are provided on the anchor, two of the tensioning holes form a group for connecting one of the steel wire ropes, and a self-clamping sleeve or a locking sleeve with a reverse limit is provided in the tensioning hole.

[0030] The fixing method between the steel wire rope and the anchor can adopt a self-clamping sleeve or a locking sleeve with a reverse limit structure for unidirectional fixing, or a petal-type clamping structure of a traditional anchor.

[0031] Furthermore, in step (3), after the steel wire ropes are synchronously tightened, a plurality of vertical connecting ropes are arranged on each layer of the steel wire ropes. The arrangement of the vertical connecting ropes can provide a vertical connection structure, improve the vertical connection relationship between the steel wire ropes, and help improve the strength of the entire steel mesh. The steel wire ropes and the vertical connecting ropes can both be round ropes or braided ropes.

[0032] Furthermore, in step (4), a rust inhibitor is sprayed on the exposed reinforcement of the severely damaged part of the pier and on the surface of the steel wire rope, and the rust inhibitor is sprayed at least twice; in step (5), the thickness of each press-apply is not more than 1 cm, and the mortar after press-apply does not naturally fall off. The next press-apply is performed when the polymer mortar applied last time is no longer sticky to the touch, and the thickness of the polymer mortar is not less than 35 mm.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The reinforcement construction method can use the anchor and the steel wire rope to reinforce the severely damaged bridge piers. During the reinforcement process, the main structure of the bridge pier will not be damaged for the second time, and there is no need to drill holes on the bridge pier to form a connecting structure, so as to avoid causing further damage to the severely damaged parts, reduce the load on the severely damaged parts, and facilitate the repair of the severely damaged parts, thereby overcoming the disadvantage of high requirements for the grade of bridge pier concrete; subsequently, with the coating of polymer mortar, the severely damaged parts can be filled and restored, so that the bridge pier can restore its original structure and continue to be used; 2. The reinforcement construction method gathers the tensioning end and the anchoring end of the steel wire rope at one place (on the same anchor) for self-pretensioning, and multiple steel wire ropes can be tensioned using the same set of anchors; 3. The self-pretensioning steel wire rope mesh reinforcement construction method is also convenient in construction, has good construction effect, excellent corrosion resistance, and high tensile strength of the steel wire rope. Good, polymer mortar has good permeability, little impact on structural shape and appearance, good durability and economy, etc.; 4. The temporary fixing device and the tensioning device are both reusable, and are used to assist in supporting the anchor and tensioning the steel wire rope during construction. When the anchor and several of the steel wire ropes are tensioned and tightened, a circumferential reinforcement system can be formed at the severely damaged part of the pier to protect the pier as a whole. At this time, the temporary fixing device and the tensioning device can be removed without affecting the tightening effect of the steel wire rope; 5. The setting of the rolling support assembly facilitates the movement of the steel wire rope along the outer periphery of the pier when the steel wire rope is tightened, improves the smoothness of the movement, and can support the steel wire rope, so that a certain distance is maintained between the steel wire rope and the pier, reducing the friction contact between the steel wire rope and the pier; the existence of these distances can also provide convenience for subsequent polymer mortar construction and facilitate interface treatment of the reinforced surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the connection between the steel wire rope and the anchor of the present invention Figure 1 ;

[0035] Figure 2 Schematic diagram of the connection between the steel wire rope and the anchor of the present invention Figure 2 ;

[0036] Figure 3 It is a schematic diagram of the structure of the steel wire rope of the present invention;

[0037] Figure 4 It is a schematic diagram of the elevation layout of a self-prestressed steel wire rope mesh reinforcement construction method of the present invention;

[0038] Figure 5 It is a schematic diagram of the plan layout of a self-pretensioned steel wire rope mesh reinforcement construction method of the present invention;

[0039] Figure 6 for Figure 5 The enlarged structural diagram at A in the middle;

[0040] Figure 7 It is a cross-sectional schematic diagram of the self-pretensioned steel mesh after the polymer mortar is added to the construction of the present invention;

[0041] Figure 8 A structural schematic diagram of the guide synchronization device in the present invention;

[0042] Fig. 9 It is a side structural schematic diagram of the guide synchronization device in the present invention;

[0043] Fig.10 A schematic diagram of the structure of the anchor in the present invention;

[0044] In the figure: 1. Bridge pier; 2. Anchor; 201. Lifting ring; 202. Self-clamping sleeve; 203. Locking sleeve; 3. Wire rope; 301. Limiting terminal; 302. Inserting terminal; 303. One-way engaging tooth; 304. Connecting hole; 4. Rolling support assembly; 401. Rolling bracket; 402. Roller; 5. Crane; 6. Positioning bracket; 7. Synchronous guide device; 701. Pulley; 702. Clamp arm; 703. Connecting groove; 704. Conversion groove; 8. Traction rope; 9. Tensioning device; 10. Vertical connecting rope; 11. Polymer mortar. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Embodiment 1

[0047] like Figure 1 to Figure 7 As shown, a self-prestressed steel wire rope mesh reinforcement construction method comprises the following steps:

[0048] (1) Clean pier 1, identify the severely damaged parts of the pier, and determine the reinforcement surface;

[0049] (2) Take an anchor 2, make the anchor 2 close to the outer surface of the pier 1 vertically by means of a temporary fixing device, and sequentially pass a plurality of steel wire ropes 3 through the anchor 2 from top to bottom. The steel wire ropes 3 pass through one side of the anchor 2, go around the outer surface of the pier 1, and then return to the anchor 2 and pass through.

[0050] (3) After the plurality of steel wire ropes 3 are successively threaded, the area enclosed by the steel wire ropes 3 covers the severely damaged part of the bridge pier; the plurality of steel wire ropes 3 are simultaneously tightened by the tensioning device 9, so that one end of the steel wire rope 3 is clamped on one side of the anchor 2, and the other end is passed through the other side of the anchor 2 and is self-pretensioned; at this time, the tensioning device 9 and the temporary fixing device are removed, and the anchor 2 and the plurality of steel wire ropes 3 surround the bridge pier 1 without damaging the bridge pier structure;

[0051] (4) After the steel wire rope 3 is installed, before the base slurry is sprayed, the reinforcement surface is cleaned and dusted, the dust on the surface of the reinforcement base is blown away, and the surface is moistened with water, and then the cleaning glue is applied;

[0052] (5) Apply the permeable polymer mortar in layers. After the polymer mortar is applied, watering and curing shall be carried out for no less than 7 days.

[0053] This reinforcement construction method can use the anchor 2 and the steel wire rope 3 to reinforce the severely damaged bridge pier 1. During the reinforcement process, the main structure of the bridge pier 1 will not be damaged for the second time, and there is no need to drill holes on the bridge pier 1 to form a connection structure, so as to avoid causing further damage to the severely damaged parts, reduce the load on the severely damaged parts, and facilitate the repair of the severely damaged parts. Subsequently, the coating of polymer mortar can fill and restore the severely damaged parts, so that the bridge pier can restore its original structure and continue to be used. This method is suitable for the repair and reinforcement of severely damaged bridge piers, such as large-area through-type large cracks and gaps.

[0054] This reinforcement construction method gathers the tensioning end and the anchoring end of the steel wire rope 3 at one place (on the same anchor) for self-pretensioning. Multiple steel wire ropes 3 can be tensioned using the same set of anchors 2. There is no need to set a fixing plate / fixer on the concrete body of the pier, and the concrete body of the pier is not damaged (no drilling, planting reinforcement, etc. is required), thus overcoming the disadvantage of having a high grade requirement for the concrete of the pier.

[0055] The self-prestressed wire rope mesh reinforcement construction method also has the advantages of convenient construction, good construction effect, excellent corrosion resistance, good tensile performance of wire rope, good permeability of polymer mortar, little impact on structural shape and appearance, good durability and economy, etc.; it has very good economic benefits, which are mainly reflected in two aspects. First, the material cost used in this reinforcement construction method is not higher than the cost of wire rope or wire mesh, etc. Second, for the reinforced bridge piers, the bridge piers that are difficult to repair and need to be demolished can be repaired and continued to be used, thereby reducing the project cost.

[0056] The temporary fixing device and the tensioning device 9 are both reusable, and are used to assist in supporting the anchor and tensioning the steel wire rope during the construction process. When the anchor and several of the steel wire ropes are tensioned and taut, a circumferential reinforcement system can be formed at the severely damaged parts of the pier, thereby protecting the pier as a whole. At this time, the temporary fixing device and the tensioning device can be removed without affecting the tightening effect of the steel wire rope.

[0057] Furthermore, the temporary fixing device is a crane 5 and a positioning bracket 6. After the crane 5 lifts the anchor 2 from above and the positioning bracket 6 supports and fixes the anchor 2 from below, it is close to the facade of the pier 1 and keeps the position unchanged.

[0058] On the one hand, the crane 5 adjusts the anchor 2 to the top of the positioning bracket 6 and makes the inner side of the anchor 2 close to the outer surface of the pier. The close-fitting part can be selected from relatively complete parts close to both sides, so as to facilitate the drawing and pulling of the steel wire rope 3. On the other hand, the crane 5 temporarily fixes the anchor 2 together with the positioning bracket 6, so that when the steel wire rope is tensioned, it can be ensured that the anchor does not move with it. The lower end of the anchor 2 can be temporarily fixed to the positioning bracket 6 by bolts.

[0059] Furthermore, when threading the steel wire rope 3, a spiral staggered threading method is adopted; the head and tail of the same steel wire rope 3 are staggered up and down on the anchor 2, the vertical spacing between the head and tail of the same steel wire rope 3 is 3 cm, and the vertical spacing between adjacent steel wire ropes is 5 cm.

[0060] The steel wire rope 3 is connected in a slightly spirally wound manner, so that the head and tail of the steel wire rope are in the same vertical plane. In other words, the distance between the steel wire rope 3 and the outer surface of the pier 1 is basically consistent, which is conducive to stable clamping and balanced force.

[0061] Furthermore, when the steel wire rope 3 is synchronously tensioned, a synchronous guide device 7 is provided on one side of the pier 1. The synchronous guide device 7 includes a bracket. A plurality of pulleys 701 are sequentially provided on the bracket from top to bottom. The pulleys 701 are respectively connected with traction ropes 8. One end of the traction rope 8 is detachably connected to the end of the steel wire rope 3, and the other end is connected to the tensioning device 9. The tensioning device 9 is a drawing machine.

[0062] The setting of the synchronous guide device 7 is conducive to pulling a plurality of the steel wire ropes 3 synchronously at the same time, and when pulling the steel wire ropes 3, the traction force for the steel wire ropes 3 is basically horizontal, which is conducive to balanced force application and reduces the displacement fluctuation of the position of the anchor 2 caused by pulling the steel wire ropes 3 up and down; the setting of the pulley 701 and the traction rope 8 can divide the main traction force concentrated at one point into several horizontal traction forces for pulling, so as to try to tighten the steel wire ropes synchronously at the same time.

[0063] Further, such as Figure 8 and Fig. 9 As shown, a pair of clamping arms 702 are provided in the upper middle portion of the bracket, and the pulley 701 is installed between the pair of clamping arms 702; the clamping arms 702 are provided with a plurality of connecting grooves 703 from top to bottom, and the plurality of connecting grooves 703 are respectively connected to the vertical conversion grooves 704, and both ends of the pulley 701 are arranged in the connecting grooves 703; when pulling the steel wire rope 3, the height position of the pulley 701 is adjusted so that the pulling rope 8 and the steel wire rope 3 are horizontally connected one by one.

[0064] By setting the connection slot 703 and the conversion slot 704, the position of the pulley 701 can be adjusted according to the actual situation, so that each pulley 701 is substantially at the same height as the corresponding steel wire rope 3. The bracket itself can also be set as a telescopic bracket to adjust the height position; the bracket and the positioning bracket of the temporary fixing device can be temporarily fixed on the ground structure by fasteners to provide a stable vertical support effect.

[0065] Furthermore, the steel wire rope 3 includes a steel wire rope body, and a limiting end 301 and an insertion end 302 arranged at both ends of the steel wire rope body, the circumferential dimension of the limiting end 301 is larger than the circumferential dimension of the steel wire rope body and is gradually enlarged at the transition point, and a portion of the steel wire rope body close to the insertion end 302 is provided with a plurality of one-way engaging teeth 303, and the insertion end 302 is also provided with a connecting hole 304.

[0066] The two ends of the steel wire rope 3 are set differently to facilitate fixing the two ends separately. The limiting end 301 will automatically clamp in the tensioning hole of the anchor 2 under the action of tension, and the inserted end 302 is convenient to pass through the anchor 2 and connect the traction rope 8. The one-way engaging teeth 303 on the steel wire rope body can cooperate with the limiting part in the anchor 2 to complete the one-way locking operation.

[0067] Furthermore, the steel wire rope 3 is provided with a plurality of rolling support assemblies 4, and the rolling support assemblies 4 include a rolling bracket 401 connected to the steel wire rope 3, and a roller 402 is provided on the rolling bracket 401; when the steel wire rope 3 is tensioned, the roller 402 abuts against the outer facade of the pier 1 to provide support force for the steel wire rope 3.

[0068] The setting of the rolling support assembly 4 facilitates the steel wire rope 3 to be smoothly unfolded and moved along the periphery of the pier when the steel wire rope 3 is tightened, thereby improving the smoothness of movement, and can support the steel wire rope 3 so that a certain distance is maintained between the steel wire rope 3 and the pier 1, thereby reducing the frictional contact between the steel wire rope 3 and the pier 1; the existence of these distances can also provide convenience for the subsequent polymer mortar construction and facilitate the interface treatment of the reinforced surface.

[0069] Furthermore, a lifting ring 201 is provided at the upper end of the anchor 2, and a plurality of transversely penetrating tensioning holes are also provided on the anchor 2. Two of the tensioning holes form a group for connecting one of the steel wire ropes 3, and a self-clamping sleeve 202 or a locking sleeve 203 with a reverse limit is provided in the tensioning hole.

[0070] Furthermore, in step (3), after the steel wire ropes 3 are synchronously tightened, a plurality of vertical connecting ropes 10 are arranged on each layer of the steel wire ropes 3. The arrangement of the vertical connecting ropes 10 can provide a vertical connection structure, improve the vertical connection relationship between the steel wire ropes, and help improve the strength of the entire steel mesh.

[0071] Furthermore, in step (4), a rust inhibitor is sprayed on the exposed reinforcement of the severely damaged part of the pier and on the surface of the steel wire rope 3, and the rust inhibitor is sprayed at least twice; in step (5), the thickness of the polymer mortar 11 applied each time does not exceed 1 cm, and the polymer mortar 11 does not fall naturally after being applied. The next application is performed when the polymer mortar 11 applied last time is no longer sticky to the touch, and the thickness of the polymer mortar 11 is not less than 35 mm.

[0072] All the steel wire ropes are made of high-strength stainless steel. The standard tensile strength of a single stainless steel wire rope is not less than 1700MPa, and the self-prestressing tensile stress value is 400MPa (error is ±15%). The stainless steel wire rope does not loosen after prestressing, and the binding force is very tight. The entire reinforcement area is covered with a 3.5cm thick polymer mortar layer. In order to better combine the newly added polymer mortar with the original pier column as a whole, the original pier column concrete in the steel wire rope reinforcement area is required to be roughened first, and then the interface glue is applied on the contact surface.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-prestressed steel wire mesh reinforcement construction method, characterized in that: The steps include: (1) Clean the bridge piers, identify the severely damaged parts of the piers, and determine the reinforcement surfaces; (2) Take an anchor and place the anchor vertically close to the outer surface of the pier through a temporary fixing device. Pass a plurality of steel wire ropes through the anchor from top to bottom. The steel wire ropes pass through one side of the anchor and go around the outer surface of the pier for one circle before returning to the anchor and passing through again. (3) After the plurality of steel wire ropes are successively threaded, the area surrounded by the steel wire ropes covers the severely damaged part of the bridge pier; the plurality of steel wire ropes are simultaneously tightened by the tensioning device, so that one end of the steel wire rope is clamped on one side of the anchor, and the other end is passed through the other side of the anchor and self-pretensioned; at this time, the tensioning device and the temporary fixing device are removed, and the anchor and the plurality of steel wire ropes surround the bridge pier without damaging the bridge pier structure; When the steel wire rope is tensioned synchronously, a synchronous guide device is provided on one side of the pier, the synchronous guide device comprises a bracket, a plurality of pulleys are provided on the bracket from top to bottom, and the pulleys are respectively connected with traction ropes, one end of the traction rope is detachably connected to the end of the steel wire rope, and the other end is connected to the tensioning device, and the tensioning device is a drawing machine or a traction machine; the temporary fixing device is a crane and a positioning bracket, after the anchor is lifted from the top by the crane and the anchor is supported and fixed from the bottom by the positioning bracket, it is close to the facade of the pier and keeps the posture unchanged; (4) After the installation of the steel wire rope is completed and before the base slurry is sprayed, the reinforcement surface is cleaned and dusted, the dust on the surface of the reinforcement base is blown away, and the surface is moistened with water, and then the cleaning glue is applied; (5) Apply the permeable polymer mortar in layers. After the polymer mortar construction is completed, watering and curing shall be carried out. The curing time shall not be less than 7 days.

2. The self-prestressed steel wire mesh reinforcement construction method according to claim 1 is characterized in that: When threading the steel wire rope, a spiral staggered threading method is adopted; the head and tail of the same steel wire rope are staggered up and down on the anchor, the vertical spacing between the head and tail of the same steel wire rope is 2-5cm, and the vertical spacing between adjacent steel wire ropes is 3-10cm.

3. The self-prestressed steel wire mesh reinforcement construction method according to claim 1, characterized in that: A pair of clamping arms is provided at the upper middle portion of the bracket, and the pulley is installed between the pair of clamping arms; the clamping arms are provided with a plurality of connecting grooves in sequence from top to bottom, and the plurality of connecting grooves are respectively connected to the vertical conversion grooves, and the two ends of the pulley are arranged in the connecting grooves; When pulling the steel wire rope, the height position of the pulley is adjusted so that the pulling rope and the steel wire rope are connected horizontally one by one.

4. The self-prestressed steel wire mesh reinforcement construction method according to claim 1, characterized in that: The steel wire rope includes a steel wire rope body, and a limiting end and an insertion end arranged at both ends of the steel wire rope body. The circumferential size of the limiting end is larger than the circumferential size of the steel wire rope body and is gradually enlarged at the transition point. The portion of the steel wire rope body close to the insertion end is provided with a plurality of one-way engaging teeth, and the insertion end is also provided with a connecting hole.

5. The self-prestressed steel wire mesh reinforcement construction method according to claim 1, characterized in that: The steel wire rope is provided with a plurality of rolling support assemblies, wherein the rolling support assemblies include a rolling bracket connected to the steel wire rope, and the rolling bracket is provided with a roller; when the steel wire rope is tensioned, the roller abuts against the outer facade of the pier to provide support force for the steel wire rope.

6. The self-prestressed steel wire mesh reinforcement construction method according to claim 1, characterized in that: The anchor is provided with a plurality of tensioning holes which penetrate transversely, two of the tensioning holes form a group and are used to connect one of the steel wire ropes, and a self-clamping sleeve or a locking sleeve with reverse limit is provided in the tensioning hole.

7. The self-prestressed steel wire mesh reinforcement construction method according to claim 1, characterized in that: In step (3), after the steel wire ropes are synchronously tightened, a plurality of vertical connecting ropes are arranged on each layer of the steel wire ropes.

8. The self-prestressed steel wire mesh reinforcement construction method according to claim 1, characterized in that: In step (4), rust inhibitor is sprayed on the exposed reinforcement of the severely damaged part of the pier and on the surface of the steel wire rope, and the rust inhibitor is sprayed at least twice. In step (5), the thickness of each press-apply is not more than 1 cm, and the mortar after press-apply does not fall naturally. The next press-apply is performed when the polymer mortar applied last time is no longer sticky to the touch, and the thickness of the polymer mortar is not less than 35 mm.

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