CN114351604B - Device based on in-situ release Zhang Shijia external prestress and bridge reinforcement method - Google Patents
Device based on in-situ release Zhang Shijia external prestress and bridge reinforcement method Download PDFInfo
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- CN114351604B CN114351604B CN202210189923.0A CN202210189923A CN114351604B CN 114351604 B CN114351604 B CN 114351604B CN 202210189923 A CN202210189923 A CN 202210189923A CN 114351604 B CN114351604 B CN 114351604B
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- 230000002787 reinforcement Effects 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 58
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 26
- 238000007493 shaping process Methods 0.000 claims abstract description 24
- 238000010276 construction Methods 0.000 claims abstract description 15
- 238000004146 energy storage Methods 0.000 claims abstract description 6
- 210000002435 tendon Anatomy 0.000 claims description 16
- 230000000712 assembly Effects 0.000 claims description 14
- 238000000429 assembly Methods 0.000 claims description 14
- 238000005452 bending Methods 0.000 claims description 7
- 238000000338 in vitro Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 229910003460 diamond Inorganic materials 0.000 description 16
- 239000010432 diamond Substances 0.000 description 16
- 238000005728 strengthening Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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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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Abstract
The invention discloses a device based on in-situ release Zhang Shijia external prestress and a bridge reinforcement method. The device based on the in-situ Zhang Shijia external prestress consists of a bow back piece, a shaping and stretching mechanism, a reinforcing force adjusting mechanism and a reinforcing mechanism. The production, shaping and energy storage of the bow back piece can be completed in a factory, so that the construction period can be effectively shortened, and the influence on traffic is reduced; the device performs structural reinforcement by site tension, avoids a series of complex operations such as site tension pre-stress and the like, can be more suitable for a scene with limited construction space, and avoids the problem that the site tension pre-stress occupies a larger construction space; when the device based on the in-situ release Zhang Shijia external prestress is used for reinforcing the bridge, the in-situ slow release prestress is used for adapting to reinforcing requirements of different degrees, so that the dynamic regulation and control of the reinforcing effect are realized.
Description
Technical Field
The invention relates to the field of reinforcement and maintenance of bridges and building structures, in particular to a device and a reinforcement method based on in-situ release Zhang Shijia external prestress.
Background
In the long-term service process of the existing concrete bridge, the influence of natural environment, traffic flow, automobile load impact and the like inevitably causes structural damage, the bearing capacity performance is reduced, the durability of the bridge is reduced and even the bridge fails, and the defect bridge is reinforced to be normal for ensuring the normal operation of the bridge. In the bridge reinforcement method at the present stage, short plates with long period and high reinforcement cost are commonly existed. Therefore, research on a reinforcement method for rapidly modifying and improving the bearing capacity of the bridge is very necessary.
At present, common concrete reinforcement methods are as follows: a method of enlarging a cross section, a method of sticking a steel plate, a method of sticking a fiber composite material, an in vitro prestress method, and the like. Adopting a reinforcing method for increasing the cross section to newly add a hysteresis effect of stress and strain between the reinforcing layer and the original structural layer, so that material waste is caused; the method for reinforcing the adhesive steel plate or the adhesive fiber composite material can effectively improve the longitudinal stress of the concrete beam and inhibit crack extension, thereby improving the bearing capacity of the structure, but has high requirements on the adhesive flatness and the cleanliness, the adhesive material is easy to peel off from the surface of the reinforced structure, the economic cost is high, and the durability is poor; the external prestress reinforcement method can achieve the effects of improving the downwarping and the closing part cracks of the beam body and improving the total bearing capacity of the structure, but has the advantages of complex construction process, limited reinforcement space, difficult control of tensioning precision, and the like, and needs to carry out prestress field tensioning by means of a large jack, a construction platform and the like. Meanwhile, the conventional reinforcement methods cannot realize dynamic regulation and control of the reinforcement effect.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a device based on in-situ Zhang Shijia external prestress, which can strengthen a building body.
The invention also provides a bridge reinforcement method with the device based on the in-situ release Zhang Shijia external prestress.
An apparatus based on in-situ discharge Zhang Shijia in vitro prestressing according to an embodiment of the first aspect of the present invention comprises:
the bow back piece is formed by bending an elastic rod piece;
the shaping and stretching mechanism is connected with the bow back piece and can shape and stretch the bow back piece;
the reinforcement force adjusting mechanism can be fixedly connected with a building body to be reinforced and can be connected with the bow back piece to adjust the tension degree of the bow back piece;
the strengthening mechanism is connected with the bow back piece, the strengthening mechanism can be connected with two sides of the area to be strengthened, the strengthening mechanism can be pulled to be close to the center direction along with the stretching of the bow back piece, and the connecting point of the strengthening mechanism and the area to be strengthened is pulled to be close to the center direction.
The device based on in-situ release Zhang Shijia external prestress has at least the following beneficial effects:
1. the production, shaping and energy storage of the bow back piece can be completed in a factory, so that the construction period can be effectively shortened, and the influence on traffic is reduced.
2. The device performs structural reinforcement by on-site stretching, and avoids a series of complex operations such as on-site stretching prestress and the like. Meanwhile, the device can be more suitable for scenes with limited construction space, and the problem that the larger construction space is occupied due to the fact that the tensioning and pre-tightening are carried out on site is avoided.
3. The device for applying external prestress based on field stretching is symmetrically arranged on two sides of the area to be reinforced, and the lower use space of the area to be reinforced is not affected.
4. After the bridge is reinforced by the device based on the in-situ Zhang Shijia external prestress, the overall rigidity and durability of the reinforced area can be improved, the bridge bearing capacity can be improved, local cracks can be closed and the like under the traction action of the bow back piece.
5. The crack is reinforced to different degrees by slowly releasing the prestress on site, so that the dynamic regulation and control of the reinforcing effect are realized.
According to some embodiments of the present invention, the shaping and stretching mechanism includes a pre-stressing tendon and a telescopic adjusting assembly, the pre-stressing tendon is disposed on the inner side of the bow-back member, the pre-stressing tendon is parallel to the stretching direction of the bow-back member, two ends of the pre-stressing tendon are connected with the bow-back member through the telescopic adjusting assembly, and at least one telescopic adjusting assembly can adjust the elongation length along the stretching direction of the bow-back member.
According to some embodiments of the invention, the telescopic adjusting assembly comprises a threaded anchor, a steering inner sleeve, a steering outer sleeve, a worm and a worm fixing piece, wherein a first connecting hole is formed in the inner side of the bow back piece, the steering outer sleeve is hinged with the first connecting hole, the steering inner sleeve is rotatably arranged in the steering outer sleeve, the threaded anchor is connected with one end of the prestress rib, the threaded anchor is in threaded connection with a barrel of the steering inner sleeve, the steering inner sleeve is provided with a turbine tooth extending out of the steering outer sleeve, the worm and the turbine tooth are in meshed transmission, and the worm is rotatably arranged on the steering outer sleeve through the worm fixing piece.
According to some embodiments of the invention, the reinforcement mechanism comprises two anchor rods, opposite ends of the two anchor rods are hinged together to form a hinge joint, the hinge joint is connected with the outer side of the bow back piece, and the other ends of the two anchor rods can be hinged to one side of the area to be reinforced respectively.
According to some embodiments of the present invention, the reinforcement mechanism includes a movable diamond and two connection components, one hinge joint of the movable diamond is connected to the outer side of the bow-back member, both the two connection components include a sliding groove piece and a sliding connection piece, the two sliding groove pieces are fixedly installed on two sides of a region to be reinforced, a sliding groove is formed in the sliding groove piece, the sliding groove is arranged along a direction perpendicular to a stretching direction of the bow-back member, the sliding connection piece is arranged in the sliding groove, the sliding connection piece can slide along the sliding groove, two hinge joints at two ends of the movable diamond are respectively hinged to the sliding connection piece, and the other hinge joint is fixedly connected to one side of the region to be reinforced, which is far away from the bow-back member.
According to some embodiments of the invention, the reinforcement mechanism comprises two anchor rods, opposite ends of the two anchor rods are hinged together to form a hinge joint, the hinge joint is connected with the outer side of the bow back piece, and the other ends of the two anchor rods can be hinged to one side of the area to be reinforced respectively.
According to some embodiments of the invention, the reinforcement means comprise a mobile diamond, one articulation point of the mobile diamond being connected to the outside of the bow-back element, the other three articulation points being able to be fixedly connected to the outside of the area to be reinforced.
According to a second aspect of the present invention, a bridge reinforcement method includes: the device based on the in-situ release Zhang Shijia external prestress carries out bridge reinforcement through the following steps:
step S100: bending the elastic rod piece into the bow back piece in a factory, shaping and storing energy of the bow back piece through the shaping and expanding mechanism, and transporting to a construction site after finishing energy storage;
step S200: fixedly connecting the reinforcement force adjusting mechanism with a positioning position and then connecting the reinforcement force adjusting mechanism with the bow back piece;
step S300: connecting the reinforcement means to both sides of the area to be reinforced, and subsequently connecting the reinforcement means to the bow-back member;
step S400: the shaping and stretching mechanism is adjusted, so that the shaping and stretching mechanism controls the stretching of the bow-back piece, the stretching degree of the bow-back piece is controlled by the reinforcing force adjusting mechanism, and along with the stretching of the bow-back piece, the reinforcing mechanism pulls connection points on two sides of the area to be reinforced to be close to the center direction, so that the crack of the area to be reinforced is closed.
The bridge reinforcement method provided by the embodiment of the invention has at least the following beneficial effects:
1. the production, shaping and energy storage of the bow back piece can be completed in a factory, so that the construction period can be effectively shortened, and the influence on traffic is reduced.
2. The device performs structural reinforcement by releasing the prestress on site, and avoids a series of complex operations such as stretching the prestress on site. Meanwhile, the device can be more suitable for scenes with limited construction space, and the problem that the larger construction space is occupied due to the fact that the tensioning and pre-tightening are carried out on site is avoided.
3. The device for applying external prestress based on field stretching is symmetrically arranged on two sides of the area to be reinforced, and the lower use space of the area to be reinforced is not affected.
4. After the bridge is reinforced by the device based on the in-situ Zhang Shijia external prestress, the overall rigidity and durability of the reinforced area can be improved, the bridge bearing capacity can be improved, local cracks can be closed and the like under the traction action of the bow back piece.
5. The crack is reinforced to different degrees by slowly releasing the prestress on site, so that the dynamic regulation and control of the reinforcing effect are realized.
According to some embodiments of the invention, in step S100, two ends of the tendon are connected to the expansion adjusting assemblies, and the expansion adjusting assemblies are connected to inner sides of two ends of the bow-back member, so that when the expansion is performed, the expansion is performed along with the extension of at least one of the expansion adjusting assemblies.
According to some embodiments of the present invention, in step S100, a steering inner sleeve is installed in a steering outer sleeve, the steering outer sleeve is hinged to a first connecting hole, a worm is meshed with a turbine tooth of the steering inner sleeve, the worm is rotatably installed on the steering outer sleeve through a worm fixing piece, two ends of the prestress rib are connected with threaded anchors, then the threaded anchors are installed in the steering inner sleeve, when the steering inner sleeve is put open, the steering inner sleeve rotates along with the worm through adjusting the worm to rotate, and during the rotation of the steering inner sleeve, the threaded anchors are driven to rotate in or out of the steering inner sleeve, so that the bow back piece is put open.
According to some embodiments of the present invention, in step S200, a fixed connection seat is installed at a positioning position, a screw is rotatably installed on the fixed connection seat, a special-shaped nut seat is further screwed on the screw, and the position of the special-shaped nut seat on the screw is adjusted by adjusting the rotation of the screw, so that both ends of the bow back piece can be just connected with the corresponding special-shaped nut seats.
According to some embodiments of the present invention, in step S300, the hinge joints at opposite ends of the two anchors are connected to the outer sides of the bow-back member, the other two ends of the two anchors are hinged to two sides of the area to be reinforced, when the bow-back member is put open, the bow-back member pulls the hinge joints connected to move in the vertical opening direction, and the hinge joints at the two ends will generate a movement trend of approaching to the central directions of the two, so that the crack of the area to be reinforced is closed.
According to some embodiments of the present invention, in step S300, one hinge node of the movable diamond frame is connected to the outer side of the bow back member, two chute members are fixedly installed on the left and right sides of the area to be reinforced, two hinge nodes at two ends of the movable diamond frame are respectively hinged to the sliding connection members, the other hinge node is fixedly connected to one side of the area to be reinforced away from the bow back member, when the bow back member is stretched, the bow back member pulls the connected hinge nodes to move in the vertical stretching direction, and the two hinge nodes at two ends pull the chute members to close in the central direction of the two hinge nodes through the sliding connection members in the chute, so that the crack of the area to be reinforced is closed.
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.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of an installation of an apparatus based on in-situ discharge Zhang Shijia external prestressing in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention after reinforcement is completed based on in-situ placement Zhang Shijia external prestressing device;
FIG. 3 is a schematic view of the bow-back member and tendon according to an embodiment of the present invention;
FIG. 4 is a schematic view of a telescopic adjustment assembly according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of the installation of the inner steering sleeve, outer steering sleeve and threaded anchor of an embodiment of the present invention;
FIG. 6 is a schematic structural view of a reinforcement force adjustment assembly according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a profiled nut seat in accordance with an embodiment of the invention;
FIG. 8 is a schematic view of the installation of a device based on in-situ placement Zhang Shijia external prestressing according to a second embodiment of the present invention;
fig. 9 is a schematic diagram of the second embodiment of the present invention after the reinforcement is completed based on the in-situ placement Zhang Shijia external prestressing device.
Reference numerals:
100. a bowback member; 110. a first connection hole; 120. a second connection hole; 130. a third connection hole;
200. shaping and expanding mechanisms; 210. prestress rib; 220. a telescoping adjustment assembly; 221. a threaded anchor; 222. turning the inner sleeve; 2221. a turbine tooth; 223. turning the outer sleeve; 2231. truss holes; 2232. an anchor hole; 224. a worm; 225. a worm fixing member;
300. a reinforcement force adjusting mechanism; 310. a reinforcement force adjustment assembly; 311. fixing the connecting seat; 312. a screw; 313. a special-shaped nut seat;
400. a reinforcement mechanism; 410. a movable diamond-shaped frame; 420. a connection assembly; 421. a chute member; 422. a sliding connection; 430. a bolt; 440. a cross bar;
500. a building body to be reinforced; 510. and (5) cracking.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
An apparatus based on in-situ delivery Zhang Shijia in vitro prestressing according to an embodiment of the present invention is described below with reference to fig. 1 to 7.
As shown in fig. 1 and 2, an apparatus based on in-situ delivery Zhang Shijia in-vitro prestressing according to an embodiment of the present invention includes:
the bow back piece 100, the bow back piece 100 is formed by bending an elastic rod piece; in the present embodiment, the bow-back member 100 is formed by bending an elastic rod member of a material having high elasticity and high rigidity, and the elastic rod member is bent into the bow-back member 100 by a press machine in a factory.
The shaping and stretching mechanism 200 is connected with the bow-back piece 100 and can shape and stretch the bow-back piece 100;
the reinforcement force adjusting mechanism 300, the reinforcement force adjusting mechanism 300 can be fixedly connected with the building body 500 to be reinforced, and the reinforcement force adjusting mechanism 300 can be connected with the bow-back piece 100 to adjust the stretching degree of the bow-back piece 100;
the strengthening mechanism 400, the strengthening mechanism 400 is connected with the bow back piece 100, and the strengthening mechanism 400 can be connected with two sides of the area to be strengthened, and the strengthening mechanism 400 can draw the connection point with the area to be strengthened to be close to the center direction along with the stretching of the bow back piece 100.
The invention also discloses a bridge reinforcement method, which is based on the device for in-situ placing Zhang Shijia external prestress and performs bridge reinforcement through the following steps:
step S100: bending the elastic rod piece into a bow back piece 100 in a factory, shaping the bow back piece 100 through a shaping and stretching mechanism 200, keeping the shape of the bow back piece 100, and transporting to a construction site after energy storage is completed; the bow-back member 100 is now in equilibrium and is transported to the site of the concrete girder bridge to be reinforced. The bow back piece 100 can be prefabricated in factories for production, manufacturing and shaping, and a series of complex operations such as on-site tensioning and prestressing are avoided, so that the construction period can be effectively shortened, and the influence on traffic is reduced.
Step S200: fixedly connecting the reinforcement force adjusting mechanism 300 with the positioning position of the region to be reinforced, and then connecting with the bow-back member 100; the positioning position is determined according to the site situation, and is a position for installing the reinforcement force adjusting mechanism 300, and is generally located at two sides in front of the crack 510 in the area to be reinforced, after the bow-back member 100 is connected to the reinforcement force adjusting mechanism 300, the positioning position is fixed on the building body 500 to be reinforced, and the degree of stretching of the bow-back member 100 is adjusted by the reinforcement force adjusting mechanism 300.
Step S300: connecting the reinforcement means 400 to both sides of the region to be reinforced, and then connecting the reinforcement means 400 to the bow-back member 100;
step S400: the shaping and stretching mechanism 200 is adjusted, so that the shaping and stretching mechanism 200 controls the stretching of the bow-back piece 100, and the stretching degree of the bow-back piece 100 is controlled by the reinforcing force adjusting mechanism 300, and as the bow-back piece 100 is stretched, the reinforcing mechanism 400 pulls the connection points on two sides of the area to be reinforced to be close to the center direction, so that the crack 510 of the area to be reinforced is closed.
The device for applying external prestress based on field stretching is symmetrically arranged on two sides of the area to be reinforced, and the lower use space of the area to be reinforced is not affected. After the bridge is reinforced by the device based on the in-situ Zhang Shijia external prestress, the rigidity and the durability of the reinforced area can be improved and the bearing capacity of the bridge can be improved under the traction action of the bow back piece. The bridge reinforcement amount is adjusted on site, the adjustment is flexible, the bridge reinforcement amount can adapt to cracks of different degrees, and as the bow back piece 100 can store certain prestress, after the cracks are expanded again, the re-reinforcement can be realized by adjusting the expansion degree of the bow back piece 100.
In some embodiments of the present invention, the shaping and stretching mechanism 200 includes a tendon 210 and a telescopic adjustment assembly 220, the tendon 210 is disposed on the inner side of the bow-back member 100, the tendon 210 is parallel to the stretching direction of the bow-back member 100, two ends of the tendon 210 are connected to the bow-back member 100 through the telescopic adjustment assembly 220, and at least one telescopic adjustment assembly 220 can adjust the elongation length along the stretching direction of the bow-back member 100.
As shown in fig. 3 to 5, after the bow-back member 100 is formed, the two ends of the tendon 210 are connected to the expansion adjusting members 220, and the two ends of the bow-back member 100 are connected to the inner sides thereof through the expansion adjusting members 220, so that when the bow-back member 100 is expanded, the total length of the tendon 210 plus the expansion adjusting members 220 becomes longer as at least one of the expansion adjusting members 220 is extended.
In a specific embodiment, two telescoping adjustment assemblies 220 may be one that can be extended and the other a fixed length connector, so that the overall structure is simpler. Another embodiment is one in which both telescoping adjustment assemblies 220 are adjustable in length, so that the overall adjustment length is wider and a greater range of adjustment of the degree of expansion of the bow-back member 100 is possible.
In a further embodiment of the present invention, the telescopic adjustment assembly 220 comprises a threaded anchor 221, a steering inner sleeve 222, a steering outer sleeve 223, a worm 224 and a worm fixing member 225, wherein a first connecting hole 110 is formed on the inner side of the bow back member 100, the steering outer sleeve 223 is hinged with 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 with one end of the prestress rib 210, the threaded anchor 221 is in threaded connection in a barrel of the steering inner sleeve 222, a worm gear 2221 extending out of the steering outer sleeve 223 is arranged on the steering inner sleeve 222, the worm 224 and the worm gear 2221 are in meshed transmission, and the worm 224 is rotatably arranged on the steering outer sleeve 223 through the worm fixing member 225.
Specifically, the steering inner sleeve 222 is installed in the steering outer sleeve 223, the steering outer sleeve 223 is hinged with the first connecting hole 110, the worm 224 is meshed with the turbine tooth 2221 of the steering inner sleeve 222, the worm 224 is rotatably installed on the steering outer sleeve 223 through the worm fixing piece 225, the two ends of the prestressed tendon 210 are connected with the threaded anchor 221, then the threaded anchor 221 is installed in the steering inner sleeve 222, when the stretching is carried out, the steering inner sleeve 222 rotates along with the rotation of the steering inner sleeve 222 through the adjustment of the rotation of the worm 224, the threaded anchor 221 is driven to screw in or screw out in the steering inner sleeve 222 in the rotation process of the steering inner sleeve 222, when the threaded anchor 221 is screwed out from the steering inner sleeve 222, the total length of the prestressed tendon 210 plus the telescopic adjusting assembly 220 is prolonged, and the bow back piece 100 is stretched.
Wherein, the steering outer sleeve 223 is provided with a truss hole 2231 corresponding to the first coupling hole 110, and the truss hole 2231 is hinged with the first coupling hole 110 by a pin. Steering inner sleeve 222 and steering outer sleeve 223 are rotatably connected by a clamping groove. The outer surface of the steering outer sleeve 223 is welded with two anchoring holes 2232, and the worm fixing member 225 is connected with the anchoring holes 2232 to rotatably mount 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 assemblies 310, two ends of the bow-back member 100 are connected to a corresponding one of the reinforcement force adjustment assemblies 310, the reinforcement force adjustment assemblies 310 can be fixedly connected to the location of the building 500 to be reinforced, at least one of the reinforcement force adjustment assemblies 310 includes a fixed connection seat 311, a screw 312, and a shaped nut seat 313, the fixed connection seat 311 is fixedly connected to the location of the building 500 to be reinforced, the screw 312 is rotatably mounted on the fixed connection seat 311, the axial direction of the screw 312 and the stretching direction of the bow-back member 100 are in the same direction, the shaped nut seat 313 is screwed on the screw 312, and the shaped nut seat 313 can be connected to one end of the bow-back member 100. The building 500 to be reinforced may be a building where a crack 510 is generated in a bridge, a tunnel, etc. and reinforcement is required.
Referring to fig. 6 and 7, in this embodiment, the fixed connection seat 311 is installed at a positioning position, the screw 312 is rotatably installed on the fixed connection seat 311, the special-shaped nut seat 313 is screwed on the screw 312, the second connection holes 120 are provided at two ends of the bow-back member 100, the sleeve posts are provided on the special-shaped nut seat 313, and the position of the special-shaped nut seat 313 on the screw 312 is adjusted by rotating the adjusting screw 312, so that the second connection holes 120 at two ends of the bow-back member 100 can be exactly sleeved on the sleeve posts of the special-shaped nut seat 313.
Wherein, the locating position is located the crack 510 top both sides of waiting the reinforcement region specifically, and fixed connection seat 311 is foraminiferous channel-section steel specifically, and fixed connection seat 311 is equipped with the guide way, and the guide way is in the same direction with the putting of bow back piece 100, and screw 312 sets up in the guide way, and both ends and fixed connection seat 311 rotate to be connected, are equipped with a plurality of screw that are used for with locating position fixed connection on the fixed connection seat 311. During installation, the fixed connection seat 311 passes through the screw hole of the strap Kong Gangcao through an anchor bolt, is anchored into a concrete layer, and is screwed by a nut, so that the fixed connection seat 311 is fixed.
In some embodiments, two reinforcement force adjustment assemblies 310 may be one reinforcement force adjustment assembly 310 that may be adjusted, and the other may be a common fastener that may be secured in place and connected to the end of the bow-back member 100, so that the overall structure is simpler. Another embodiment is that the two reinforcing force adjusting assemblies 310 can be adjusted, so that the bow-back piece 100 can be always arranged symmetrically with the central line of the area to be reinforced, the direction of the force applied by the reinforcing mechanism 400 can not be changed, and the stress distortion of the anchor rod or the movable diamond frame is avoided.
In some embodiments of the present invention, the reinforcement mechanism 400 includes two anchors 430, opposite ends of the two anchors 430 being hinged together into a hinge joint, the hinge joint being connected to the outer side of the bow-back member 100, and the other ends of the two anchors 430 being hinged to one side of the region to be reinforced, respectively. When the bow back piece 100 is put open, the bow back piece 100 pulls the two connected anchors to rotate, and the hinge joints at the two ends can generate a movement trend of approaching to the central directions of the two anchors, so that the crack 510 of the area to be reinforced is closed.
Further, after the reinforcement is completed, the two ends of the cross rod 440 are connected with the two anchor rods 430, specifically, the two ends of the cross rod 440 are connected with the anchor rods 430 through the connecting holes on the cross rod 440 by bolts and other connecting pieces, so as to form a tripod structure, and the function of stabilizing the whole structure is achieved. When the reinforcement needs to be performed again, the cross rod 440 is removed, the tension degree of the bow-back member 100 is adjusted, and the cross rod 440 is reinstalled after the reinforcement is performed again.
In other embodiments of the present invention, the reinforcement mechanism 400 includes a movable diamond 410 and two connection components 420, wherein one hinge joint of the movable diamond 410 is connected to the outer side of the bow-back member 100, the two connection components 420 each include a sliding groove member 421 and a sliding connection member 422, the two sliding groove members 421 are fixedly installed on the left and right sides of the area to be reinforced, the sliding groove 421 is provided with a sliding groove, the sliding groove is arranged along the direction perpendicular to the opening direction of the bow-back member 100, the sliding connection member 422 is provided in the sliding groove, the sliding connection member 422 can slide along the sliding groove, the two hinge joints at two ends of the movable diamond 410 are respectively hinged with the sliding connection member 422, and the other hinge joint is fixedly connected to one side of the area to be reinforced away from the bow-back member 100. One hinge joint of the movable diamond 410 is connected with the outer bottom of the bow back piece 100, two sliding connecting pieces 422 are fixedly arranged on two sides of a region to be reinforced, a sliding groove is formed in the sliding groove along the stretching direction of the vertical bow back piece 100, the sliding connecting pieces 422 are arranged in the sliding groove, the sliding connecting pieces 422 can slide along the sliding groove, two hinge joints at two ends of the movable diamond 410 are respectively connected with the sliding connecting pieces 422, the other hinge joint is fixedly connected with one side, far away from the bow back piece 100, of the region to be reinforced, when the bow back piece 100 is stretched, the connected hinge joint is pulled by the bow back piece 100 to move towards the vertical stretching direction, and the two hinge joints at two ends draw the sliding groove to close towards the central direction of the two sliding grooves through the sliding connecting pieces 422 in the sliding groove, so that a crack 510 of the region to be reinforced is closed.
Referring to fig. 1 and 2, the bow back member 100 is installed above the area to be reinforced, a third connecting hole 130 is provided on the outer side of the bottom of the bow back member 100, the third connecting hole 130 is hinged to a hinge joint of the movable diamond frame, two sliding grooves are provided on the left and right sides of the area to be reinforced, and the two sliding grooves are symmetrically arranged with the center line of the area to be reinforced. Two hinged nodes at two ends of the movable diamond are connected with a sliding connecting piece 422 in the sliding groove. The other hinge joint is fixedly connected to the side of the region to be reinforced remote from the bow-back member 100.
When the bow back piece 100 is stretched, the bottom of the bow back piece 100 moves upwards, the connected hinge joint is pulled to move towards the vertical stretching direction, the traction movable diamond frame 410 deforms, the sliding connection piece 422 connected with the two hinge joints at the two ends is limited by the sliding groove, horizontal force towards the opposite direction is generated, the force is transmitted to the area to be reinforced through the sliding groove piece 421, the two sides of the area to be reinforced are subjected to traction force, and accordingly the two sides are close towards the central direction of the two sides, and the crack 510 of the area to be reinforced is closed.
After the reinforcing area is reinforced for the first time, the bow-back piece 100 can still store a certain prestress, and after a period of time, the bow-back piece 100 can be reinforced again by releasing the prestress stored by the bow-back piece 100 again along with the re-expansion of the crack.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is 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 embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. An in-situ-release Zhang Shijia-based in-vitro pre-stressing device, comprising:
the bow back piece is formed by bending an elastic rod piece;
the shaping and stretching mechanism is connected with the bow back piece and can shape and stretch the bow back piece;
the reinforcement force adjusting mechanism can be fixedly connected with a building body to be reinforced and can be connected with the bow back piece to adjust the tension degree of the bow back piece;
the reinforcing mechanism is connected with the bow back piece, can be connected with two sides of the area to be reinforced, and can draw the connection point of the area to be reinforced to be close to the center direction along with the stretching of the bow back piece;
the shaping and stretching mechanism comprises a prestressed rib and a telescopic adjusting component, wherein the prestressed rib is arranged on the inner side of the bow back piece, the prestressed rib is parallel to the stretching direction of the bow back piece, two ends of the prestressed rib are connected with the bow back piece through the telescopic adjusting component, and at least one telescopic adjusting component can adjust the stretching length along the stretching direction of the bow back piece;
the telescopic adjusting assembly comprises a threaded anchorage device, a steering inner sleeve, a steering outer sleeve, a worm and a worm fixing piece, wherein a first connecting hole is formed in the inner side of the bow back piece, the steering outer sleeve is hinged with the first connecting hole, the steering inner sleeve is rotatably arranged in the steering outer sleeve, the threaded anchorage device is connected with one end of the prestress rib, the threaded anchorage device is in threaded connection with the cylinder of the steering inner sleeve, the steering inner sleeve is provided with a turbine tooth extending out of the steering outer sleeve, the worm and the turbine tooth are in meshed transmission, and the worm is rotatably arranged on the steering outer sleeve through the worm fixing piece;
the reinforcing force adjusting mechanism comprises two reinforcing force adjusting components, two ends of the bow back piece are respectively connected with one corresponding reinforcing force adjusting component, the reinforcing force adjusting components can be fixedly connected with the positioning position of a building to be reinforced, at least one reinforcing force adjusting component comprises a fixed connecting seat, a screw rod and a special-shaped nut seat, the fixed connecting seat is used for being fixedly connected with the positioning position, the screw rod is rotatably arranged on the fixed connecting seat, the axial direction of the screw rod and the stretching direction of the bow back piece are in the same direction, the special-shaped nut seat is in threaded connection with the screw rod, and the special-shaped nut seat can be connected with one end of the bow back piece;
the reinforcing mechanism comprises two anchor rods, opposite ends of the two anchor rods are hinged together to form a hinged joint, the hinged joint is connected with the outer side of the bow back piece, and the other ends of the two anchor rods can be hinged to one side of a region to be reinforced respectively.
2. A method of bridge reinforcement, comprising: the device based on in-situ discharge Zhang Shijia in-vitro prestressing of claim 1, wherein the device based on in-situ discharge Zhang Shijia in-vitro prestressing performs bridge reinforcement by:
step S100: bending the elastic rod piece into the bow back piece in a factory, shaping and storing energy of the bow back piece through the shaping and expanding mechanism, and transporting to a construction site after completing energy storage;
step S200: fixedly connecting the reinforcement force adjusting mechanism with a positioning position and then connecting the reinforcement force adjusting mechanism with the bow back piece;
step S300: connecting the reinforcement means to both sides of the area to be reinforced, and subsequently connecting the reinforcement means to the bow-back member;
step S400: the shaping and stretching mechanism is adjusted, the stretching of the bow-back piece is controlled through the shaping and stretching mechanism, the stretching degree of the bow-back piece is controlled through the reinforcing force adjusting mechanism, and along with the stretching of the bow-back piece, the reinforcing mechanism pulls connection points on two sides of a region to be reinforced to be close to the center direction, so that a crack of the region to be reinforced is closed.
3. The bridge reinforcement method according to claim 2, wherein: in step S100, two ends of the tendon are connected with the expansion adjusting assemblies, and the expansion adjusting assemblies are connected with the inner sides of two ends of the bow back member, so that when the expansion is performed, the bow back member expands along with the expansion of at least one of the expansion adjusting assemblies.
4. A method of bridge reinforcement according to claim 3, wherein: in step S100, the steering inner sleeve is installed in the steering outer sleeve, the steering outer sleeve is hinged with the first connecting hole, the worm is meshed with the turbine tooth of the steering inner sleeve, the worm is installed on the steering outer sleeve in a rotating manner through the worm fixing piece, the two ends of the prestressed tendon are connected with threaded anchors, the threaded anchors are installed in the steering inner sleeve, when the steering inner sleeve is unfolded, the steering inner sleeve rotates along with the worm through adjusting the worm to rotate, and in the rotating process of the steering inner sleeve, the threaded anchors are driven to rotate out in the steering inner sleeve, so that the bow back piece is unfolded.
5. The bridge reinforcement method according to claim 2, wherein: in step S200, the fixed connection seat is installed at the positioning position, the screw is rotatably installed on the fixed connection seat, and then the special-shaped nut seat is in threaded connection with the screw, and the position of the special-shaped nut seat on the screw is adjusted by adjusting the rotation of the screw, so that the two ends of the bow back piece can be just connected with the corresponding special-shaped nut seat.
6. The bridge reinforcement method according to claim 2, wherein: in step S300, the hinge joints at the opposite ends of the two anchor rods are connected with the outer sides of the bow back piece, the other ends of the two anchor rods are respectively hinged to one side of the area to be reinforced, when the bow back piece is put open, the bow back piece pulls the hinge joints to move towards the vertical opening direction, and the hinge endpoints at the two ends can generate a movement trend of approaching towards the central directions of the hinge joints, so that the crack of the area to be reinforced is closed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210189923.0A CN114351604B (en) | 2022-02-28 | 2022-02-28 | Device based on in-situ release Zhang Shijia external prestress and bridge reinforcement method |
| PCT/CN2022/099215 WO2023159811A1 (en) | 2022-02-28 | 2022-06-16 | Device for applying external prestress on basis of on-site release, and bridge reinforcement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210189923.0A CN114351604B (en) | 2022-02-28 | 2022-02-28 | Device based on in-situ release Zhang Shijia external prestress and bridge reinforcement method |
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| Publication Number | Publication Date |
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| CN114351604A CN114351604A (en) | 2022-04-15 |
| CN114351604B true CN114351604B (en) | 2023-12-22 |
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| CN202210189923.0A Active CN114351604B (en) | 2022-02-28 | 2022-02-28 | Device based on in-situ release Zhang Shijia external prestress and bridge reinforcement method |
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| CN (1) | CN114351604B (en) |
| WO (1) | WO2023159811A1 (en) |
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| CN114351604B (en) * | 2022-02-28 | 2023-12-22 | 长沙理工大学 | Device based on in-situ release Zhang Shijia external prestress and bridge reinforcement method |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3835262A1 (en) * | 1988-03-26 | 1989-10-12 | Kober Ag | Joint cover for expansion joints in traffic ways |
| JPH08209631A (en) * | 1995-02-03 | 1996-08-13 | Kajima Corp | Construction method for multispan continuous bridge |
| RU2205926C1 (en) * | 2001-12-10 | 2003-06-10 | Воронежская государственная архитектурно-строительная академия | Arrangement strengthening stone walls of buildings |
| CN101158238A (en) * | 2007-11-21 | 2008-04-09 | 王用中 | Broken-line reinforcement prestressed concrete pre-tensioned girder construction process |
| KR20090127524A (en) * | 2008-06-09 | 2009-12-14 | 한국건설기술연구원 | Bridge and its construction method using tide arch hybrid girders by connecting precast blocks |
| CN102296750A (en) * | 2011-05-31 | 2011-12-28 | 中铁十局集团建筑工程有限公司 | Wide span prestressed beam string structure and its construction method |
| CN204080652U (en) * | 2014-06-13 | 2015-01-07 | 林同棪国际工程咨询（中国）有限公司 | Pre-stressed bridge deflection adjusting device and pre-stressed bridge thereof |
| CN205152817U (en) * | 2015-11-06 | 2016-04-13 | 沈阳建筑大学 | External prestressed reinforcement structure of bent cap |
| CN106401197A (en) * | 2016-10-28 | 2017-02-15 | 东南大学 | Existing cable force fine adjusting device |
| CN106869520A (en) * | 2017-04-12 | 2017-06-20 | 福州大学 | A kind of reinforced beam bracing means and its installation method |
| CN108103965A (en) * | 2018-01-12 | 2018-06-01 | 长沙理工大学 | Prestressed Bailey beam for reinforcement and construction method thereof |
| CN108193607A (en) * | 2018-01-12 | 2018-06-22 | 长沙理工大学 | Fabricated prestressed truss for reinforcement and construction method thereof |
| CN109025314A (en) * | 2018-07-27 | 2018-12-18 | 中民筑友科技投资有限公司 | A kind of pre- stretching machine |
| CN110029592A (en) * | 2019-04-12 | 2019-07-19 | 长沙理工大学 | A kind of external prestressing FRP tendons stretching and anchoring device |
| CN212053807U (en) * | 2020-02-25 | 2020-12-01 | 刘学坤 | External prestressing force structure of building roof beam |
| JP2021075920A (en) * | 2019-11-11 | 2021-05-20 | 神鋼鋼線工業株式会社 | Pc steel tension adjustment jig and pc steel tension adjustment method |
| CN113152312A (en) * | 2021-04-19 | 2021-07-23 | 南京润华建设集团有限公司 | External prestress reinforcing structure of bent cap |
| CN215758591U (en) * | 2021-09-17 | 2022-02-08 | 宋成志 | Adjustable road bridge prestress reinforcing device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH707301B1 (en) * | 2013-04-08 | 2014-06-13 | Empa | Method for creating prestressed concrete structures by means of profiles of a shape memory alloy and structure, produced by the process. |
| CN108708498B (en) * | 2018-07-09 | 2023-12-05 | 上海建工集团股份有限公司 | External prestress reinforced concrete frame beam structure and construction method thereof |
| CN110565546B (en) * | 2019-09-09 | 2024-04-16 | 长沙理工大学 | Detachable device for assembling prestress for bridge structure and reinforcing method |
| CN114351604B (en) * | 2022-02-28 | 2023-12-22 | 长沙理工大学 | Device based on in-situ release Zhang Shijia external prestress and bridge reinforcement method |
-
2022
- 2022-02-28 CN CN202210189923.0A patent/CN114351604B/en active Active
- 2022-06-16 WO PCT/CN2022/099215 patent/WO2023159811A1/en unknown
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3835262A1 (en) * | 1988-03-26 | 1989-10-12 | Kober Ag | Joint cover for expansion joints in traffic ways |
| JPH08209631A (en) * | 1995-02-03 | 1996-08-13 | Kajima Corp | Construction method for multispan continuous bridge |
| RU2205926C1 (en) * | 2001-12-10 | 2003-06-10 | Воронежская государственная архитектурно-строительная академия | Arrangement strengthening stone walls of buildings |
| CN101158238A (en) * | 2007-11-21 | 2008-04-09 | 王用中 | Broken-line reinforcement prestressed concrete pre-tensioned girder construction process |
| KR20090127524A (en) * | 2008-06-09 | 2009-12-14 | 한국건설기술연구원 | Bridge and its construction method using tide arch hybrid girders by connecting precast blocks |
| CN102296750A (en) * | 2011-05-31 | 2011-12-28 | 中铁十局集团建筑工程有限公司 | Wide span prestressed beam string structure and its construction method |
| CN204080652U (en) * | 2014-06-13 | 2015-01-07 | 林同棪国际工程咨询（中国）有限公司 | Pre-stressed bridge deflection adjusting device and pre-stressed bridge thereof |
| CN205152817U (en) * | 2015-11-06 | 2016-04-13 | 沈阳建筑大学 | External prestressed reinforcement structure of bent cap |
| CN106401197A (en) * | 2016-10-28 | 2017-02-15 | 东南大学 | Existing cable force fine adjusting device |
| CN106869520A (en) * | 2017-04-12 | 2017-06-20 | 福州大学 | A kind of reinforced beam bracing means and its installation method |
| CN108103965A (en) * | 2018-01-12 | 2018-06-01 | 长沙理工大学 | Prestressed Bailey beam for reinforcement and construction method thereof |
| CN108193607A (en) * | 2018-01-12 | 2018-06-22 | 长沙理工大学 | Fabricated prestressed truss for reinforcement and construction method thereof |
| CN109025314A (en) * | 2018-07-27 | 2018-12-18 | 中民筑友科技投资有限公司 | A kind of pre- stretching machine |
| CN110029592A (en) * | 2019-04-12 | 2019-07-19 | 长沙理工大学 | A kind of external prestressing FRP tendons stretching and anchoring device |
| JP2021075920A (en) * | 2019-11-11 | 2021-05-20 | 神鋼鋼線工業株式会社 | Pc steel tension adjustment jig and pc steel tension adjustment method |
| CN212053807U (en) * | 2020-02-25 | 2020-12-01 | 刘学坤 | External prestressing force structure of building roof beam |
| CN113152312A (en) * | 2021-04-19 | 2021-07-23 | 南京润华建设集团有限公司 | External prestress reinforcing structure of bent cap |
| CN215758591U (en) * | 2021-09-17 | 2022-02-08 | 宋成志 | Adjustable road bridge prestress reinforcing device |
Non-Patent Citations (4)
| Title |
|---|
| 体外预应力加固后PC简支梁的极限状态分析;龚道义;龚道勇;张健飞;;山西建筑(11);全文 * |
| 体外预应力技术在连续梁桥加固中的应用;何舒婷;建筑技术;第47卷(第12期);正文第1089-1091页 * |
| 体外预应力桥梁转向块的受力性能分析;殷新锋等;中外公路;第37卷(第05期);正文第100-103页 * |
| 飞云江跨海特大桥变截面连续箱梁体外临时锚固设计与施工;王磊等;公路交通科技;第35卷(第S1期);正文第87-91页 * |
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| CN114351604A (en) | 2022-04-15 |
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