CN114351604B - Device based on in-situ release Zhang Shijia external prestress and bridge reinforcement method - Google Patents

Abstract

The invention discloses a device and a bridge reinforcement method for applying external prestress based on on-site tensioning. The device for applying external prestress based on on-site tensioning consists of a back part, a shaping and tensioning mechanism, a reinforcement force adjustment mechanism and a reinforcement mechanism. The production, shaping and energy storage of the bow parts can all be completed in the factory, which can effectively shorten the construction period and reduce the impact on traffic; this device performs structural reinforcement through on-site tensioning, which avoids the need for on-site tensioning preparation. A series of complex operations such as stress, etc., are more adaptable to scenarios with limited construction space, and avoid the problem of on-site tensioning and pre-tightening occupying a large construction space; when using the device of the present invention based on on-site tensioning and external prestressing, When the bridge is reinforced, the prestressing force is slowly released on site to adapt to different levels of reinforcement needs and to achieve dynamic regulation of the reinforcement effect.

Description

A device and bridge reinforcement method for applying external prestress based on on-site tensioning

Technical field

The invention relates to the field of bridge and building structure reinforcement and maintenance, and in particular to a device and reinforcement method for applying external prestress based on on-site tensioning.

Background technique

During the long-term service of existing concrete bridges, affected by the natural environment, traffic flow, vehicle load impact, etc., structural damage will inevitably occur, the bearing capacity performance will decrease, the bridge durability will decrease or even fail. In order to ensure the normal operation of the bridge, it is necessary to Reinforcement of defective bridges has become the norm. However, the current bridge reinforcement methods generally have shortcomings of long cycle and high reinforcement cost. Therefore, it is very necessary to carry out research on reinforcement methods for rapid transformation and improvement of bridge bearing capacity.

At present, commonly used concrete reinforcement methods include: increasing cross-section method, pasting steel plate method, pasting fiber composite material method and external prestressing method. The enlarged cross-section reinforcement method is used to increase the hysteresis effect of stress and strain between the newly added solid layer and the original structural layer, resulting in material waste; the reinforcement method of pasting steel plates or pasting fiber composite materials can effectively improve the longitudinal stress of concrete beams, inhibit crack extension, and thus improve the structure. The load-bearing capacity is high, but the requirements for the flatness and cleanliness of the pasting are high. The pasting material is easy to peel off from the surface of the reinforced structure, resulting in high economic costs and poor durability. Although the external prestressed reinforcement method can improve the deflection and closure of the beam body, Partial cracks have the effect of improving the total bearing capacity of the structure, but the construction process is relatively complicated, the reinforcement space is limited, and the precision control of tensioning is difficult to ensure. It is necessary to use large jacks and construction platforms for prestressed on-site tensioning. At the same time, several commonly used reinforcement methods are unable to achieve dynamic control of the reinforcement effect.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a device for applying external prestress based on on-site tensioning, which can reinforce the building.

The present invention also proposes a bridge reinforcement method with the above-mentioned device for applying external prestress based on on-site tensioning.

A device for applying external prestressing based on on-site tensioning according to the first embodiment of the present invention includes:

A back piece, the back piece is formed by bending an elastic rod;

A shaping and unfolding mechanism is connected to the bow part and can shape and unfold the bow part;

Reinforcement force adjustment mechanism, the reinforcement force adjustment mechanism can be fixedly connected to the building to be reinforced, and the reinforcement force adjustment mechanism can be connected to the back part to adjust the degree of relaxation of the back part;

Reinforcement mechanism, the reinforcement mechanism is connected to the back part, the reinforcement mechanism can be connected to both sides of the area to be reinforced, and the reinforcement mechanism can pull the area to be reinforced as the back part is expanded. The connection points move closer to the center.

The device for applying external prestressing based on on-site tension according to the embodiment of the present invention has at least the following beneficial effects:

1. The production, shaping and energy storage of the bow parts can be completed in the factory, which can effectively shorten the construction period and reduce the impact on traffic.

2. This device performs structural reinforcement through on-site tensioning, which avoids a series of complex operations such as on-site tensioning and prestressing. At the same time, it is more adaptable to scenarios with limited construction space and avoids the problem of occupying a large construction space due to on-site tensioning and pre-tightening.

3. The device for applying external prestress based on on-site tensioning is symmetrically installed on both sides of the area to be reinforced, and will not affect the use space of the lower part of the area to be reinforced.

4. After the bridge is reinforced using the device for applying external prestress based on on-site tensioning of the present invention, under the pulling action of the back part, the overall stiffness and durability of the reinforcement area can be improved, the bearing capacity of the bridge can be improved, and the partial closure can be achieved Cracks etc.

5. Reinforce cracks of varying degrees by slowly tensioning the prestress on site to achieve dynamic control of the reinforcement effect.

According to some embodiments of the present invention, the shaping and relaxing mechanism includes prestressed tendons and telescopic adjustment components. The prestressed tendons are arranged inside the back part of the bow. The prestressed tendons are in contact with the back part. The expansion direction of the prestressed tendon is parallel, and the two ends of the prestressed tendon are connected to the back part through the telescopic adjustment component. At least one of the telescopic adjustment components can adjust the elongation length along the expansion direction of the back part. .

According to some embodiments of the present invention, the telescopic adjustment assembly includes a threaded anchor, a steering inner sleeve, a steering outer sleeve, a worm and a worm fixing piece, and a first connection hole is provided on the inner side of the back part, and the The steering outer sleeve is hingedly connected to the first connection hole. The steering inner sleeve is rotatably installed in the steering outer sleeve. The threaded anchor is connected to one end of the prestressed tendon. The threaded anchor Threaded in the barrel of the steering inner sleeve, the steering inner sleeve is provided with a worm gear extending out of the steering outer sleeve, the worm and the worm gear are engaged and driven, and the worm is driven by The worm fixing member is rotatably mounted on the steering outer sleeve.

According to some embodiments of the present invention, the reinforcement mechanism includes two anchor rods, and the opposite ends of the two anchor rods are hingedly connected together to form a hinged node, and the hinged node is connected to the outside of the bow member, The other ends of the two anchor rods can be hingedly connected to one side of the area to be reinforced.

According to some embodiments of the present invention, the reinforcement mechanism includes a movable diamond frame and two connecting components. A hinge node of the movable diamond frame is connected to the outer side of the back part. Both of the connecting components include sliders. The two chute members are used to be fixedly installed on both sides of the area to be reinforced. The chute members are provided with chute, and the chute is along the vertical direction of the back member. It is arranged in the unfolding direction, and the sliding connector is provided in the chute. The sliding connector can slide along the chute. The two hinged nodes at both ends of the movable diamond frame are hinged to the sliding connector respectively. connection, the other hinge node is used to be fixedly connected to the side of the area to be reinforced that is away from the back member.

According to some embodiments of the present invention, the reinforcement mechanism includes two anchor rods, and the opposite ends of the two anchor rods are hingedly connected together to form a hinged node, and the hinged node is connected to the outside of the bow member, The other ends of the two anchor rods can be hingedly connected to one side of the area to be reinforced.

According to some embodiments of the present invention, the reinforcement mechanism includes a movable diamond frame, one hinge node of the movable diamond frame is connected to the outside of the back part, and the other three hinge nodes can be connected to the outside of the area to be reinforced. Fixed connection.

The bridge reinforcement method according to the embodiment of the second aspect of the present invention includes: the above-mentioned device for applying external prestress based on on-site tensioning. The device for applying external prestressing based on on-site tensioning performs bridge reinforcement through the following steps:

Step S100: Bend the elastic rod into the back part in the factory, shape and store energy through the shaping and tensioning mechanism, and transport it to the construction site after completing the energy storage;

Step S200: Fixedly connect the reinforcement force adjustment mechanism to the positioning position, and then connect it to the back piece;

Step S300: Connect the reinforcement mechanism to both sides of the area to be reinforced, and then connect the reinforcement mechanism to the back piece;

Step S400: Adjust the shaping and spreading mechanism so that the shaping and spreading mechanism controls the bending part to spread, and controls the spreading degree of the bending part through the reinforcement force adjustment mechanism, and then When the back part is opened, the reinforcement mechanism pulls the connection points on both sides of the area to be reinforced to move closer to the center, thereby closing the cracks in the area to be reinforced.

The bridge reinforcement method according to the embodiment of the present invention has at least the following beneficial effects:

1. The production, shaping and energy storage of the bow parts can be completed in the factory, which can effectively shorten the construction period and reduce the impact on traffic.

2. This device performs structural reinforcement through on-site tensioning and prestressing, which avoids a series of complex operations such as on-site tensioning and prestressing. At the same time, it is more adaptable to scenarios with limited construction space and avoids the problem of occupying a large construction space due to on-site tensioning and pre-tightening.

3. The device for applying external prestress based on on-site tensioning is symmetrically installed on both sides of the area to be reinforced, and will not affect the use space of the lower part of the area to be reinforced.

4. After the bridge is reinforced using the device for applying external prestress based on on-site tensioning of the present invention, under the pulling action of the back part, the overall stiffness and durability of the reinforcement area can be improved, the bearing capacity of the bridge can be improved, and the partial closure can be achieved Cracks etc.

5. Reinforce cracks of varying degrees by slowly tensioning the prestress on site to achieve dynamic control of the reinforcement effect.

According to some embodiments of the present invention, in the bridge reinforcement method, in step S100, the two ends of the prestressed tendons are connected to telescopic adjustment components, and the telescopic adjustment components and the inner sides of the two ends of the back part are connected to each other. connection, when expanding, as at least one of the telescopic adjustment components is extended, the backrest member is expanded.

According to some embodiments of the present invention, in step S100, the steering inner sleeve is installed in the steering outer sleeve, the steering outer sleeve is hingedly connected to the first connection hole, and the worm and the steering inner sleeve are The worm teeth are engaged, and then the worm is rotated and installed on the steering outer sleeve through a worm fixing piece, the two ends of the prestressed tendons are connected to threaded anchors, and then the threaded anchors are installed on the In the turning inner sleeve, when unfolding, by adjusting the rotation of the worm, the turning inner sleeve rotates accordingly. During the rotation of the turning inner sleeve, the threaded anchor is driven at the desired position. The turning inner sleeve is rotated in or out to allow the back part to expand.

According to some embodiments of the present invention, in step S200, the fixed connection base is installed at the positioning position, the screw rod is rotationally installed on the fixed connection base, and then the special-shaped nut seat is threadedly connected to the screw rod. The screw rod rotates and the position of the special-shaped nut seat on the screw rod is adjusted so that the two ends of the back part can be connected to the corresponding special-shaped nut seat.

According to some embodiments of the present invention, in step S300, the hinged nodes at the opposite ends of the two anchor rods are connected to the outside of the bow member, and the other two ends of the two anchor rods are hingedly connected at both sides of the area to be reinforced. On the other side, when the bow part is unfolded, the bow part pulls the connected hinge node to move in the vertical unfolding direction, and the hinged end points at both ends will have a tendency to move closer to the center of the two. This closes the cracks in the area to be reinforced.

According to some embodiments of the present invention, in step S300, a hinge node of the movable diamond frame is connected to the outside of the bow member, and the two chute members are fixedly installed on the left and right sides of the area to be reinforced, Two hinged nodes at both ends of the movable diamond-shaped frame are hingedly connected to the sliding connector respectively, and the other hinged node is fixedly connected to the side of the area to be reinforced away from the back part. When the back part When the parts are unfolded, the back part pulls the connected hinge nodes to move in the vertical unfolding direction, and the two hinge nodes at both ends pull the chute parts through the sliding connectors in the chute. Move closer to the center of the two to close the cracks in the area to be reinforced.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of the drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

Figure 1 is a schematic installation diagram of a device for applying external prestressing based on on-site tensioning according to an embodiment of the present invention;

Figure 2 is a schematic diagram of a device for applying external prestress based on on-site tensioning after completion of reinforcement according to the embodiment of the present invention;

Figure 3 is a schematic structural diagram of the back part and prestressed tendon according to the embodiment of the present invention;

Figure 4 is a schematic structural diagram of a telescopic adjustment assembly according to an embodiment of the present invention;

Figure 5 is an installation cross-sectional view of the steering inner sleeve, the steering outer sleeve and the threaded anchor according to the embodiment of the present invention;

Figure 6 is a schematic structural diagram of the reinforcement force adjustment assembly according to the embodiment of the present invention;

Figure 7 is a cross-sectional view of the special-shaped nut seat according to the embodiment of the present invention;

Figure 8 is a schematic diagram of the installation of a device for applying external prestressing based on on-site tensioning according to the second embodiment of the present invention;

Figure 9 is a schematic diagram of a device for applying external prestressing based on on-site tensioning after completion of reinforcement according to the second embodiment of the present invention.

Reference signs:

100. Back piece; 110. First connection hole; 120. Second connection hole; 130. Third connection hole;

200. Shaping and tensioning mechanism; 210. Prestressed tendons; 220. Telescopic adjustment components; 221. Threaded anchors; 222. Steering inner sleeve; 2221. Turbine teeth; 223. Steering outer sleeve; 2231. Truss hole; 2232. Anchor hole; 224. Worm; 225. Worm fixing piece;

300. Reinforcement force adjustment mechanism; 310. Reinforcement force adjustment component; 311. Fixed connection seat; 312. Screw; 313. Special-shaped nut seat;

400. Reinforcement mechanism; 410. Movable diamond frame; 420. Connection components; 421. Chutes; 422. Sliding connectors; 430. Anchors; 440. Cross bars;

500. Building to be reinforced; 510. Cracks.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and cannot be understood as limiting the present invention.

In the description of the present invention, it should be understood that orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or position relationships shown in the drawings and are only In order to facilitate the description of the present invention and simplify the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In the description of the present invention, several means one or more, plural means two or more, greater than, less than, more than, etc. are understood to exclude the original number, and above, below, within, etc. are understood to include the original number. If there is a description of first and second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features. relation.

In the description of the present invention, unless otherwise explicitly limited, words such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on what a person of ordinary skill in the art can implement. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions is possible. It does not exist and is not within the protection scope required by the present invention.

The following describes a device for applying external prestressing based on on-site tensioning according to an embodiment of the present invention with reference to FIGS. 1 to 7 .

As shown in Figures 1 and 2, a device for applying external prestress based on on-site tensioning according to an embodiment of the present invention includes:

The back part 100 is bent by an elastic rod. In this embodiment, the back part 100 is made of an elastic rod made of high elasticity and high stiffness material. The elastic rod is bent using a press in the factory. Bend into the bow piece 100 .

The shaping and unfolding mechanism 200 is connected with the bow part 100 and can shape and unfold the bow part 100;

Reinforcement force adjustment mechanism 300. The reinforcement force adjustment mechanism 300 can be fixedly connected to the building 500 to be reinforced. The reinforcement force adjustment mechanism 300 can be connected to the back part 100 to adjust the degree of expansion of the back part 100;

The reinforcement mechanism 400 is connected to the back part 100. The reinforcement mechanism 400 can be connected to both sides of the area to be reinforced. The reinforcement mechanism 400 can draw the connection point with the area to be reinforced toward the center as the back part 100 expands. direction closer.

The invention also discloses a bridge reinforcement method. The bridge reinforcement is carried out through the following steps based on a device for applying external prestress on site:

Step S100: Bend the elastic rod into the back part 100 in the factory, and shape the back part 100 through the shaping and tensioning mechanism 200 so that the back part 100 maintains its shape, and then transports it to the construction site after completing the energy storage; When the back part 100 is in a balanced state, it is then transported to the site of the concrete beam bridge to be reinforced. The production and shaping of the bow part 100 can be prefabricated in the factory, which avoids a series of complex operations such as tensioning and prestressing on site, thereby effectively shortening the construction period and reducing the impact on traffic.

Step S200: Fixedly connect the reinforcement force adjustment mechanism 300 to the positioning position of the area to be reinforced, and then connect it to the back part 100; the positioning position mentioned here is determined according to the on-site conditions and is the position for installing the reinforcement force adjustment mechanism 300. It is generally located on both sides in front of the crack 510 in the area to be reinforced. After the back part 100 is connected to the reinforcement force adjustment mechanism 300, it is fixed on the building 500 to be reinforced. Subsequently, the back part 100 is adjusted through the reinforcement force adjustment mechanism 300. The degree of relaxation.

Step S300: Connect the reinforcement mechanism 400 to both sides of the area to be reinforced, and then connect the reinforcement mechanism 400 to the back part 100;

Step S400: Adjust the shaping and spreading mechanism 200 so that the shaping and spreading mechanism 200 controls the bending part 100 to spread, and controls the spreading degree of the bending part 100 through the reinforcement force adjustment mechanism 300. As the bending part 100 When released, the reinforcement mechanism 400 pulls the connection points with both sides of the area to be reinforced toward the center, thereby closing the crack 510 in the area to be reinforced.

Devices that apply external prestressing based on on-site tensioning are symmetrically installed on both sides of the area to be reinforced, and will not affect the lower use space of the area to be reinforced. After the bridge is reinforced using the device for applying external prestress based on on-site tensioning of the present invention, under the pulling action of the back part, the stiffness and durability of the reinforcement area can be improved, and the bridge's bearing capacity can be improved. The amount of reinforcement of the bridge is adjusted on site. The adjustment is flexible and can adapt to cracks of different degrees. Since the back part 100 can store a certain amount of prestress, when the cracks expand again, the expansion of the back part 100 can be adjusted. degree to achieve further reinforcement.

In some embodiments of the present invention, the shaping and tensioning mechanism 200 includes a prestressed tendon 210 and a telescopic adjustment assembly 220. The prestressed tendon 210 is disposed on the inside of the bow member 100. The tensioning direction is parallel, and the two ends of the prestressed tendons 210 are connected to the back part 100 through telescopic adjustment components 220. At least one telescopic adjustment component 220 can adjust the elongation length along the expansion direction of the back part 100.

As shown in FIGS. 3 to 5 , after the back part 100 is formed, the two ends of the prestressed tendons 210 are connected to the telescopic adjustment components 220 , and the telescopic adjustment components 220 are connected to the inner sides of the two ends of the back part 100 . During expansion, as at least one of the telescopic adjustment components 220 is elongated, the total length of the prestressed tendon 210 plus the telescopic adjustment component 220 becomes longer, and the bow member 100 is expanded.

In a specific embodiment, one of the two telescopic adjustment components 220 can be adjusted in length, and the other is a fixed-length connecting member, so that the overall structure is simpler. Another embodiment is that the lengths of the two telescopic adjustment assemblies 220 can be adjusted. In this case, the overall adjustment length is wider, and the degree of relaxation of the back part 100 can be adjusted in a wider range.

In a further embodiment of the present invention, the telescopic adjustment assembly 220 includes a threaded anchor 221, a steering inner sleeve 222, a steering outer sleeve 223, a worm 224 and a worm fixing member 225, and a first connection is provided on the inside of the bow member 100 hole 110, the steering outer sleeve 223 is hingedly connected to the first connecting hole 110, the steering inner sleeve 222 is rotatably arranged in the steering outer sleeve 223, the threaded anchor 221 is connected to one end of the prestressed tendon 210, the threaded anchor 221 is threaded Connected to the barrel of the steering inner sleeve 222, the steering inner sleeve 222 is provided with a worm gear 2221 extending out of the steering outer sleeve 223. The worm 224 meshes with the worm gear 2221 for transmission. The worm 224 is rotated and installed on the worm gear through the worm fixing member 225. Turn to outer sleeve 223.

Specifically, the steering inner sleeve 222 is installed in the steering outer sleeve 223, the steering outer sleeve 223 is hingedly connected to the first connecting hole 110, the worm 224 meshes with the worm gear 2221 of the steering inner sleeve 222, and then the steering outer sleeve 223 is hingedly connected to the first connecting hole 110. The fixing member 225 rotates the worm 224 and installs it on the steering outer sleeve 223, connects the two ends of the prestressed tendons 210 with threaded anchors 221, and then installs the threaded anchors 221 in the steering inner sleeve 222, and then unfolds When the worm 224 is adjusted to rotate, the steering inner sleeve 222 rotates accordingly. During the rotation of the steering inner sleeve 222, the threaded anchor 221 is driven to screw in or out of the steering inner sleeve 222. When the threaded anchor When 221 is unscrewed from the steering inner sleeve 222, the total length of the prestressed tendons 210 plus the telescopic adjustment assembly 220 becomes longer, and the bow member 100 expands.

Among them, the steering outer sleeve 223 is provided with a truss hole 2231 corresponding to the first connection hole 110, and the truss hole 2231 and the first connection hole 110 are hingedly connected through a pin. The steering inner sleeve 222 and the steering outer sleeve 223 are rotationally connected through a slot. Two anchor holes 2232 are welded on the outer surface of the steering outer sleeve 223. The worm fixing member 225 is connected to the anchor holes 2232 to rotate the worm 224 on the steering outer sleeve 223.

In some embodiments of the present invention, the reinforcement force adjustment mechanism 300 includes two reinforcement force adjustment components 310. Both ends of the back part 100 are connected to a corresponding reinforcement force adjustment component 310. The reinforcement force adjustment component 310 can be connected to the reinforcement force adjustment component 310 to be reinforced. Fixed connection at the positioning position of the building body 500. At least one reinforcement force adjustment component 310 includes a fixed connection base 311, a screw rod 312, and a special-shaped nut seat 313. The fixed connection base 311 is used to be fixedly connected to the positioning position of the building body 500 to be reinforced. The screw rod 312 is rotatably mounted on the fixed connection seat 311. The axial direction of the screw rod 312 is in the same direction as the unfolding direction of the bow part 100. The special-shaped nut seat 313 is threadedly connected to the screw rod 312. The special-shaped nut seat 313 can be connected to one end of the bow part 100. connect. The building 500 to be reinforced may be a bridge, a tunnel, or other buildings that require reinforcement due to cracks 510 .

As shown in FIG. 6 and FIG. 7 , in this embodiment, the fixed connection base 311 is installed at the positioning position, the screw rod 312 is rotated and installed on the fixed connection base 311 , and then the special-shaped nut seat 313 is threadedly connected to the screw rod 312 , the second connection holes 120 are provided at both ends of the back part 100, and the special-shaped nut seat 313 is provided with a sleeve. By rotating the adjusting screw 312, the position of the special-shaped nut seat 313 on the screw 312 is adjusted, so that the back part 100 is The second connecting holes 120 at both ends can be sleeved on the sleeve posts of the special-shaped nut seat 313.

Among them, the positioning position is specifically located on both sides of the crack 510 in the area to be reinforced. The fixed connection seat 311 is specifically a channel steel with holes. The fixed connection seat 311 is provided with a guide groove, and the guide groove is in the same direction as the unfolding direction of the back part 100. , the screw rod 312 is arranged in the guide groove, and its two ends are rotationally connected to the fixed connection base 311. The fixed connection base 311 is provided with a plurality of screw holes for fixed connection with the positioning position. During installation, the fixed connection base 311 is passed through the screw hole of the perforated steel channel through the anchor bolt, anchored into the concrete layer, and tightened with nuts to complete the fixation of the fixed connection base 311.

In some specific embodiments, the two reinforcement force adjustment components 310 can be one that can be adjusted, and the other is an ordinary fixing component, as long as it can be fixed in the positioning position, and is connected with the back part 100 The ends can be connected, so that the overall structure is simpler. Another embodiment is that both reinforcement force adjustment assemblies 310 can be adjusted, so that the back part 100 can always be maintained symmetrically about the center line of the area to be reinforced, so that the direction of the force received by the reinforcement mechanism 400 will not change. , to prevent the anchor rod or the movable diamond frame from being distorted by force.

In some embodiments of the present invention, the reinforcing mechanism 400 includes two anchor rods 430. Opposite ends of the two anchor rods 430 are hingedly connected together to form a hinged node. The hinged node is connected to the outside of the bow member 100. The two anchors The other end of the rod 430 is hingedly connected to one side of the area to be reinforced. When the bow part 100 is unfolded, the bow part 100 pulls the two connected anchor rods to rotate, and the hinge nodes at both ends will move toward the center of the two anchors, thus closing the crack 510 in the area to be reinforced. .

Furthermore, after the reinforcement is completed, the two ends of the cross bar 440 and the two anchor rods 430 are connected together. Specifically, the bolts and other connectors are passed through the connecting holes on the cross bar 440 and the anchor rods 430 are connected together to form A tripod structure plays a role in stabilizing the overall structure. When it is necessary to reinforce again, first remove the cross bar 440, adjust the degree of expansion of the back part 100, and then reinstall the cross bar 440 after reinforcing it.

In other embodiments of the present invention, the reinforcing mechanism 400 includes a movable diamond frame 410 and two connection assemblies 420. A hinge node of the movable diamond frame 410 is connected to the outside of the bow member 100. Both connection assemblies 420 include sliders. The two chute parts 421 and the sliding connection part 422 are used to be fixedly installed on the left and right sides of the area to be reinforced. Set in the unfolding direction, a sliding connector 422 is provided in the chute, and the sliding connector 422 can slide along the chute. The two hinge nodes at both ends of the movable diamond frame 410 are respectively hingedly connected to the sliding connector 422, and the other hinge node is It is fixedly connected to the side away from the back part 100 of the area to be reinforced. Connect a hinged node of the movable rhombus frame 410 to the outer bottom of the bow part 100, fix the two sliding connectors 422 on both sides of the area to be reinforced, and set the chute along the unfolding direction of the vertical bow part 100, A sliding connector 422 is provided in the chute, and the sliding connector 422 can slide along the chute. The two hinged nodes at both ends of the movable diamond frame 410 are respectively connected to the sliding connector 422, and the other hinged node is away from the area to be reinforced. One side of 100 is fixedly connected. When the bow part 100 is unfolded, the bow part 100 pulls the connected hinge nodes to move in the vertical unfolding direction. The two hinge nodes at both ends pass through the sliding connectors 422 in the chute. , pulling the chute closer to the center direction of the two, thereby closing the crack 510 in the area to be reinforced.

Let us illustrate with Figures 1 and 2. The bow part 100 is installed above the area to be reinforced. The bottom outer side of the bow part 100 is provided with a third connection hole 130. The third connection hole 130 and a hinge node of the movable diamond frame Hinged, two chutes are set on the left and right sides of the area to be reinforced, and the two chutes are arranged symmetrically with the center line of the area to be reinforced. The two hinged nodes at both ends of the movable diamond frame are connected to the sliding connectors 422 in the chute. Another hinge node is fixedly connected to the side of the area to be reinforced away from the back part 100 .

When the bow part 100 is unfolded, the bottom of the bow part 100 will move upward, pulling the connected hinge nodes to move in the vertical unfolding direction, pulling the movable diamond frame 410 to deform, and the two hinge nodes at both ends connected The sliding connector 422 is restricted by the chute and will generate a horizontal force. This force is transmitted to the area to be reinforced through the chute 421, so that both sides of the area to be reinforced are subject to traction force, thereby moving closer to the center of the two. , thereby closing the cracks 510 in the area to be reinforced.

Moreover, after the device completes the first reinforcement of the reinforcement area, the back part 100 can still store a certain prestress. After a period of time, as the crack expands again, by releasing the prestress stored in the back part 100 again, the back part 100 can be used again. Reinforce the area.

In the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" is intended to be in conjunction with the description of the embodiment. or examples describe specific features, structures, materials, or characteristics that are included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the invention. The scope of the invention is defined by the claims and their equivalents.

Claims (6)

1. A device for applying external prestress based on on-site tensioning, which is characterized by including: A back piece, the back piece is formed by bending an elastic rod; A shaping and unfolding mechanism is connected to the bow part and can shape and unfold the bow part; Reinforcement force adjustment mechanism, the reinforcement force adjustment mechanism can be fixedly connected to the building to be reinforced, and the reinforcement force adjustment mechanism can be connected to the back part to adjust the degree of relaxation of the back part; Reinforcement mechanism, the reinforcement mechanism is connected to the back part, the reinforcement mechanism can be connected to both sides of the area to be reinforced, and the reinforcement mechanism can pull the area to be reinforced as the back part is expanded. The connection points move closer to the center; The shaping and tensioning mechanism includes prestressed tendons and telescopic adjustment components. The prestressed tendons are arranged on the inner side of the bow member. The prestressed tendons are parallel to the expansion direction of the bow member. The prestressed tendons are Both ends of the tendons are connected to the back part through the telescopic adjustment components, and at least one of the telescopic adjustment components can adjust the elongation length along the expansion direction of the back part; The telescopic adjustment assembly includes a threaded anchor, a steering inner sleeve, a steering outer sleeve, a worm and a worm fixing piece. A first connection hole is provided on the inside of the bow piece, and the steering outer sleeve and the third A connecting hole is hingedly connected, and the steering inner sleeve is rotatably installed in the steering outer sleeve. The threaded anchor is connected to one end of the prestressed tendon, and the threaded anchor is threadedly connected to the steering inner sleeve. In the barrel of the sleeve, the steering inner sleeve is provided with a worm gear extending out of the steering outer sleeve, the worm and the worm gear are meshed and driven, and the worm is rotated and installed on the worm fixing piece. The said steering is on the outer sleeve; The reinforcement force adjustment mechanism includes two reinforcement force adjustment components. The two ends of the back part are respectively connected to the corresponding one of the reinforcement force adjustment components. The reinforcement force adjustment component can be connected to the positioning position of the building to be reinforced. Fixed connection, at least one of the reinforcement force adjustment components includes a fixed connection seat, a screw rod, and a special-shaped nut seat. The fixed connection seat is used for fixed connection with the positioning position. The screw rod is rotationally installed on the fixed connection seat. The axial direction of the screw rod is in the same direction as the unfolding direction of the back part, the special-shaped nut seat is threadedly connected to the screw rod, and the special-shaped nut seat can be connected to one end of the back part; The reinforcement mechanism includes two anchor rods. The opposite ends of the two anchor rods are hinged together to form a hinge node. The hinge node is connected to the outside of the bow member. The other two anchor rods are One end can be hingedly connected to one side of the area to be reinforced. 2. A bridge strengthening method, characterized in that it includes: the device for applying external prestressing based on on-site tensioning according to claim 1, and the device for applying external prestressing based on on-site tensioning performs bridge reinforcement through the following steps: Step S100: Bend the elastic rod into the back part in the factory, shape and store energy through the shaping and tensioning mechanism, and transport it to the construction site after completing the energy storage; Step S200: Fixedly connect the reinforcement force adjustment mechanism to the positioning position, and then connect it to the back piece; Step S300: Connect the reinforcement mechanism to both sides of the area to be reinforced, and then connect the reinforcement mechanism to the back piece; Step S400: Adjust the shaping and opening mechanism, control the opening of the back part through the shaping and opening mechanism, and control the opening degree of the back part through the reinforcement force adjustment mechanism, and then When the back part is opened, the reinforcement mechanism pulls the connection points on both sides of the area to be reinforced to move closer to the center, thereby closing the cracks in the area to be reinforced. 3. The bridge reinforcement method according to claim 2, characterized in that: in step S100, the two ends of the prestressed tendon are connected to telescopic adjustment components, and the two ends of the telescopic adjustment components and the back part are connected to each other. The ends are connected inwardly. During the expansion process, as at least one of the telescopic adjustment components is extended, the backrest member is expanded. 4. The bridge reinforcement method according to claim 3, characterized in that: in step S100, the steering inner sleeve is installed in the steering outer sleeve, and the steering outer sleeve is hingedly connected to the first connection hole, The worm meshes with the gear teeth of the steering inner sleeve, and then the worm is rotated and installed on the steering outer sleeve through a worm fixing piece. The two ends of the prestressed tendon are connected with threaded anchors, and then the worm is mounted on the steering outer sleeve. The threaded anchor is installed in the turning inner sleeve. When unfolding, by adjusting the rotation of the worm, the turning inner sleeve rotates accordingly. During the rotation of the turning inner sleeve, the The threaded anchor is unscrewed from the inner sleeve of the steering wheel, allowing the back part to expand. 5. The bridge reinforcement method according to claim 2, characterized in that: in step S200, the fixed connection base is installed at the positioning position, the screw is rotated and installed on the fixed connection base, and then the special-shaped nut seat is threaded Connected to the screw rod, the position of the special-shaped nut seat on the screw rod is adjusted by adjusting the rotation of the screw rod, so that the two ends of the back part can be connected to the corresponding special-shaped nut seat. 6. The bridge reinforcement method according to claim 2, characterized in that: in step S300, connect the hinge nodes at the opposite ends of the two anchor rods to the outside of the bow member, and the other ends of the two anchor rods They are respectively hingedly connected to one side of the area to be reinforced. When the bow part is unfolded, the bow part pulls the connected hinge nodes to move in the vertical unfolding direction, and the hinged end points at both ends will move in two directions. The movement trend of the center direction of the reinforcement is closer, thereby closing the cracks in the area to be reinforced.