CN111702947B

CN111702947B - Prefabricated bridge steel bar lifting type positioning device and method

Info

Publication number: CN111702947B
Application number: CN202010371485.0A
Authority: CN
Inventors: 陈建华; 金德�; 张丽洁; 张立华; 薛菲; 郑鹤鸣; 陈运
Original assignee: Shanghai Lande Road Design And Consulting Co ltd
Current assignee: Shanghai Lande Road Design And Consulting Co ltd
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2021-08-27
Anticipated expiration: 2040-05-06
Also published as: CN111702947A

Abstract

The technical scheme includes that the fixing device is used for fixing the support and the cover body, a plurality of steel bars can be quickly and conveniently fixed or fixedly cancelled, the positioning device is repeatedly assembled and disassembled for use, and cost and working hours are saved.

Description

Prefabricated bridge steel bar lifting type positioning device and method

Technical Field

The invention relates to the field of bridge construction, in particular to a prefabricated bridge structure, and specifically relates to a prefabricated bridge reinforcing steel bar lifting type positioning device and a positioning method.

Background

With the development of economy, bridges are built more and more at intersections of rivers, mountainous areas and highways, and the bridges are generally constructed in a cast-in-place mode in the prior art, which has great requirements on the surrounding environment and is easily limited by construction conditions.

In recent years, the full prefabrication production mode of bridge member factories is widely applied. In the design of the fully-prefabricated assembled bridge, the prefabricated pier stud is connected with the embedded sleeves at the bottom of the prefabricated components at the upper part of the bridge such as the prefabricated capping beam through the reserved steel bars at the top of the pier stud in the field under most conditions, and in order to ensure the smooth connection of the prefabricated pier stud and the prefabricated components at the upper part of the bridge, the position precision of the reserved steel bars at the top of the pier stud is strictly controlled when the pier stud is prefabricated.

The positioning device is adopted to position the reserved steel bars and fix the reserved steel bars one by welding or thread structures in the prior art, then concrete is poured to form a prefabricated pier, and the positioning device and the prefabricated pier are integrated in some schemes, so that the waste of the positioning device is caused. In some schemes, after the pier is formed, the positioning device is removed by cutting, or the thread structures are unscrewed one by one. The assembly and disassembly of the solution are time-consuming and labor-consuming and inefficient.

Disclosure of Invention

The invention provides a prefabricated bridge steel bar lifting type positioning device aiming at any one of the problems, which is characterized in that: the lifting device comprises a support, a cover body, a lifting driving device and a clamping block, wherein a groove is formed in the support, and the clamping block is arranged in the groove; the lifting driving device is fixedly connected with the cover body; the reinforcing steel bar penetrates through the support and the cover body, and the clamping blocks can be driven to clamp the reinforcing steel bar when the cover body moves upwards.

Further, it is characterized in that: the support is a square annular structure with four first frames, grooves are formed in the first frames, a plurality of first steel bar through holes are formed in the bottom surfaces of the grooves, and two positioning grooves are formed in the outer sides of the first steel bar through holes.

Further, it is characterized in that: the clamping block comprises a first clamping jaw and a second clamping jaw, the clamping jaws comprise a wedge-shaped main body part and a supporting part located below the main body, the wedge-shaped main body part comprises a top surface, a bottom surface and four side surfaces, the size of the bottom surface close to the supporting part is small, the size of the top surface far away from the supporting part is large, two opposite surfaces in the four side surfaces are parallel, the other two side surfaces comprise a front surface perpendicular to the top surface and the bottom surface and a back surface inclined relative to the front surface, and a notch with an arc-shaped cross section is formed in the front surface.

Further, it is characterized in that: the supporting parts of the first jaw and the second jaw are installed in the two positioning grooves, and the notch of the first jaw and the notch of the second jaw are oppositely arranged.

Further, it is characterized in that: the cover body is of a square annular structure with four second frames, a plurality of second steel bar through holes are formed in the second frames, the second steel bar through holes are aligned with the first steel bar through holes, two fixing through holes are formed in the periphery of each second steel bar through hole, and two groups of lifting driving devices are connected to the positions of the two fixing through holes.

Further, it is characterized in that: every group lifting drive arrangement includes a driving piece, the driving piece is big end down's wedge structure, includes an inclined plane, the inclined plane cooperatees with the back of the slope of jack catch.

Further, it is characterized in that: the support is provided with a first limiting part, the cover body is provided with a second limiting part, the first limiting part is a groove at a position with a certain distance from the edge of the support, the second limiting part is a protrusion extending downwards from the position with a certain distance from the edge of the cover body, and the protrusion can be inserted into the groove and is in sliding contact with the side wall of the groove.

Further, it is characterized in that: the four first frames are provided with first limiting parts, and the four second frames are provided with second limiting parts.

The invention also provides a positioning method of the prefabricated bridge steel bar, which is characterized in that any one of the positioning devices is adopted, and the method comprises the following steps: firstly, fixing a lifting driving device on a cover body;

placing the supporting parts of the first clamping jaw and the second clamping jaw in a positioning groove at the bottom of the groove, wherein the notch of the first clamping jaw and the notch of the second clamping jaw are oppositely arranged;

the head of a steel bar penetrates through a first steel bar through hole of the support and a space between the first clamping jaw and the second clamping jaw;

and applying upward force to the cover plate to enable the cover plate to move upwards, driving the driving piece to move upwards along the inclined planes of the first clamping jaw and the second clamping jaw respectively, further driving the first clamping jaw and the second clamping jaw to move in opposite directions, and clamping the reinforcing steel bars.

According to the technical scheme, the plurality of steel bars can be fixed or not fixed quickly and conveniently, and the positioning device is repeatedly assembled and disassembled for use, so that the cost and the working time are saved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a top view of the positioning device of the present invention after the positioning device has been used to secure the reinforcing bars;

FIG. 2 is a cross-sectional view of the position of the reinforcing bars after the positioning device of the present invention fixes the reinforcing bars;

FIG. 3 is a cross-sectional view of the positioning member after the positioning device of the present invention fixes the reinforcing steel bars;

FIG. 4 is a top view of the stand of the present invention;

FIG. 5 is a cross-sectional view of FIG. 4;

FIG. 6 is a top view of the cover plate of the present invention;

FIG. 7 is a bottom view of the cover plate of the present invention;

FIG. 8 is a top view of a locating block of the present invention;

FIG. 9 is a bottom view of the locating block of the present invention;

FIG. 10 is a lift drive, with front view A; b is a top view;

FIG. 11 is a schematic view of the cover plate and support with the lift drive secured thereto;

FIG. 12 is a schematic view of the clamping block of FIG. 11 installed;

FIG. 13 is a view of the reinforcement bar passing through the clamp blocks;

FIG. 14 is a schematic view of the cover plate lifted upwardly;

FIG. 15 is a top view of a base according to another embodiment of the present invention;

FIG. 16 is an enlarged partial view of the groove location of FIG. 15;

FIG. 17 is a bottom view of another embodiment of the present invention;

fig. 18 is a top view of another embodiment of the present invention after installation of reinforcement bars.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 3, the prefabricated bridge reinforcing bar positioning device of the present invention includes a bracket 100, a cover 200, a lifting driving means 240, and a clamping block 120.

As shown in fig. 4-5, the support 100 has a square ring structure with four first frames, the first frames are provided with grooves 130, a plurality of first steel bar through holes 133 are disposed on a bottom surface 131 of the grooves 130, and two positioning grooves 132 are disposed outside the first steel bar through holes 133.

As shown in fig. 6 to 7, the cover 200 has a square ring structure with four second frames, a plurality of reinforcement through holes 204 are formed in the second frames, and the second reinforcement through holes 204 are aligned with the first reinforcement through holes 133. Two fixing through holes 202 are formed in two sides of the second steel bar through hole 204, and two sets of lifting driving devices 240 are connected to the positions of the two fixing through holes 202. Wherein the second reinforcing bar through hole 203 may allow the first jaw 121 and the second jaw 122 of the lifting driving means 240 to pass therethrough and to be placed in the groove 130.

As shown in fig. 8 to 9, the clamping block 120 includes a first jaw 121 and a second jaw 122, and the jaw 121 includes a wedge-shaped body portion and a support portion 123 under the body portion. The wedge-shaped main body portion includes a top surface, a bottom surface and four side surfaces, wherein the bottom surface close to the support portion 123 is small in size, the top surface far from the support portion 123 is large in size, two opposite surfaces of the four side surfaces are parallel, the other two side surfaces include a front surface perpendicular to the top surface and the bottom surface and a back surface inclined relative to the front surface, and a notch 124 having an arc-shaped cross section is formed in the front surface.

The support portions 123 of the first and

second jaws

121 and 122 are mounted in the two positioning grooves 132, and the recesses 124 of the first and

second jaws

121 and 124 are oppositely disposed. Wherein the width of the supporting portion 123 is determined by the width of the positioning slot 132, so that the supporting portion 123 can move left and right within the positioning slot with a certain range.

Referring to fig. 10, each set of the lifting driving means 240 includes a driving member 221, a connecting screw 222 and a nut 223, wherein one end of the connecting screw 222 is fixedly connected or detachably connected to the driving member 221, and the other end thereof is connected to the nut 223. The connection rod 222 passes through the fixing through hole 202 of the cover body 200 and is fixed to the cover body 200 by the nut 223, so that the lift driving means 240 operates together with the cover body 200. And the distance between the driver 221 and the cover 200 can be set by adjusting the coupling screw 222 and the nut 223.

The driving member 221 is a wedge-shaped structure with a small top and a large bottom, and includes an inclined surface, and the inclined surface is matched with the inclined back surface of the claw. When mounting, one of the drivers 221 is inserted between the back surface of the first jaw 121 and one sidewall of the groove, and the other of the drivers 221 is inserted between the inclined surface of the second jaw 122 and the other sidewall of the groove. When the cover body moves upwards, the two driving pieces 221 of the two groups of lifting driving devices can move upwards, acting force can be applied to the inclined surfaces of the clamping jaws 121/122, and then the two clamping jaws move oppositely.

Preferably, as shown in fig. 3, a first limiting member 110 is disposed on the support 100, and a second limiting member 210 is disposed on the cover 200, wherein the first limiting member 110 is a groove at a position spaced apart from the edge of the support 100, and the second limiting member 210 is a protrusion extending downward from a position spaced apart from the edge of the cover 200, and the protrusion can be inserted into the groove and slidably contact with the side wall of the groove. In another embodiment, the first limiting member 110 is a protrusion extending upward from the edge of the support 100, the second limiting member 210 is a protrusion extending downward from a position at a distance from the edge of the cover 200, and a surface of the second limiting member 210 close to the edge of the cover 200 is in sliding contact with a surface of the first limiting member 110 away from the edge.

Preferably, the four first frames are provided with the first limiting members 110, and the four second frames are provided with the second limiting members 210. Thus, the position of the cover 200 and the stand 100 in the horizontal direction can be accurately defined by the position of the position-limiting member.

Preferably, the supporting portion 123 has a strip-shaped structure, and the length of the supporting portion is adapted to the length of the positioning slot 132. Preferably, the bottom surface of the supporting portion 123 is an arc-shaped structure, so that the swing of the

jaws

121 and 122 can be facilitated.

Preferably, the surface of the recess 124 has a micro-convex structure to facilitate clamping of the reinforcing bars.

Preferably, the surface of the recess 124 has an elastic layer, such as rubber, elastic resin, etc.

Preferably, the openings at the lower sides of the first steel bar through hole and the second steel bar through hole are provided with chamfer structures, so that the insertion of steel bars is facilitated.

In one aspect, the jaws may not be inserted into the grooves through the second reinforcing bar through-holes, but may be pre-installed in the grooves together with the driving member 221, and then the installation process may be performed by coupling the coupling screw 222 with the cover body 200.

The positioning method of the prefabricated bridge steel bar positioning device is described below with reference to the accompanying drawings 11-14:

first, the lifting driving device 240 is fixed to the cover 200, specifically, the driving member 221 and the connecting screw 222 are fixed (in another aspect, the driving member 221 and the connecting screw 222 are an integral structure), and the screw 222 passes through the second steel bar through hole 204 of the cover 200, and a part passing through the through hole 204 is fixed by a nut 223. The cover body 200 is coupled to the support 100, and the first stopper 110 and the second stopper 210 are aligned. As shown in fig. 11.

The clamping block 120 is placed in the groove of the holder 100, specifically, the first jaw 121 and the second jaw 122 are respectively inserted through the second reinforcing bar through-hole 204, and the supporting portion 123 of the jaws is placed in the positioning groove 132 at the bottom of the groove, at which time, the notch 124 of the first jaw 121 and the notch 124 of the second jaw 12 are oppositely disposed, and such that one driving member 221 is inserted between the inclined surface of the first jaw 121 and one side wall of the groove, and the other driving member 221 is inserted between the inclined surface of the second jaw 122 and the other side wall of the groove. See fig. 12.

The head of the reinforcing bar 300 is inserted through the first reinforcing bar through-hole 133 of the holder 100 and the space between the first jaw 121 and the second jaw 122, see fig. 13.

Applying an upward force to the cover plate 200 causes the cover plate 200 to move upward, bringing the two driving members 221 to move upward along the slopes of the first and

second jaws

121 and 122, respectively. Thereby driving the first jaw 121 and the second jaw 122 towards each other and clamping the reinforcement bar 300, see fig. 14.

Then, a spacer, for example, a multi-layered spacer, is interposed between the cover body 200 and the stand 100 to lock the distance between the cover body 200 and the stand 100 while achieving the fixation of the plurality of reinforcing bars. Casting and the like can be performed subsequently.

When the positioning device needs to be disassembled after the prefabricated member is formed, the fixing member is firstly disassembled, and then the cover plate 200 and the support 100 are sequentially taken down.

The above method is described in detail for the connection of the support 100, the cover 200, the lift drive 240 and the clamping block 120, for the sake of clarity. In actual use, the steel bar connecting device can be connected in advance, and can be directly connected with the steel bar in use.

In another embodiment, the lifting driving device 220 is fixedly connected to the cover 200, which is suitable for a situation where it is not necessary to adjust the distance between the driving block 221 and the cover 200.

In another solution, the spacer between the cover and the support is a length-adjustable device, for example a threaded structure connected to each other, which by rotation allows the length adjustment of said structure to adapt to different distances between the cover and the support. Wherein the length adjustable device is fixed to one of the cover and the support.

In the above embodiment, the positions of the first steel bar through hole and the second steel bar through hole of the positioning device are fixed, so that the positioning device is suitable for fixing the prefabricated member structure in the arrangement form of the steel bars. In another embodiment, a positioning device is provided which may be for different rebar arrangements, the main structure of which is the same as the above embodiment.

Specifically, as shown in fig. 15, each of the rims of the cradle 100 is provided with a bar-shaped groove 140, and a first bar-shaped through-hole 141 extending along the length direction of the first rim is formed on the bottom wall of the bar-shaped groove 140.

As shown in fig. 15 to 16, a first long groove 142 and a second long groove 142 are formed at both sides of the first strip-shaped through hole 141, for accommodating the supporting portions 123 of the first jaw 121 and the second jaw 122, respectively.

As shown in fig. 17 to 18, a second strip through hole 240 is formed in the cover plate 200, a first strip fixing hole 241 and a second strip fixing hole 242 extending in parallel are formed at both sides of the second strip through hole 240, and two sets of the lifting driving devices 220 are fixed to the first strip fixing hole 241 and the second strip fixing hole 242 through nuts 223.

The two sets of lifting driving devices 220 correspond to the first jaw 121 and the second jaw 122 in position, and can be arranged at any position in the second strip-shaped through hole or the strip-shaped groove.

In operation, a desired number of first and

second jaws

121, 122 are placed in predetermined positions of first and second

long grooves

142, 142 on the bottom wall of the bar-shaped groove 140. Accordingly, a required number of the lift driving means 220 are fixed to the cover plate 200 at predetermined positions. Wherein one driving block 221 is inserted between the inclined surface of the first jaw 121 and one sidewall of the groove, and the other driving block 221 is inserted between the inclined surface of the second jaw 122 and the other sidewall of the groove.

The head of the reinforcing bar 300 is inserted through the first strip through hole 141 of the holder 100 and the second strip through hole 240 of the cap plate 200 at predetermined positions.

Applying an upward lifting force to the cover plate 200 causes the cover plate 200 to move upward, which drives the driving block 221 to move upward along the inclined surfaces of the first jaw 121 and the second jaw 122, respectively. Thereby driving the first jaw 121 and the second jaw 122 to move towards each other and clamping the reinforcing bar 300. Meanwhile, the reaction force applied to the driving member 221 by driving the first jaw 121 and the second jaw 122 makes the driving block 221 contact with the side wall of the groove 140 more tightly, so that strict limitation of the lifting driving device moving in the horizontal direction is realized, and further, the precise positioning of the reinforcing steel bar is realized.

The contact surface between the driving block 221 and the side wall of the groove 140 is a rough structure, so that the lifting driving device can be more strictly limited, for example, the friction coefficient between the driving block and the groove is 0.2-0.6.

Then, a spacer is interposed between the cover body 200 and the support 100 or the length of the length-adjustable device is adjusted, so that the distance between the cover body 200 and the support 100 is limited, and a plurality of reinforcing bars are fixed. Casting and the like can be performed subsequently.

The disassembly mode is the same as the above embodiment, and is not described herein again, and the position and the number of the steel bars 300 can be set and positioned according to the actual situation by using the scheme of this embodiment.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims

1. The utility model provides a prefabricated bridge reinforcing bar lifts formula positioner which characterized in that: the lifting device comprises a support, a cover body, a lifting driving device and a clamping block, wherein a groove is formed in the support, and the clamping block is arranged in the groove; the lifting driving device is fixedly connected with the cover body; the reinforcing steel bars penetrate through the support and the cover body, and the clamping blocks can be driven to clamp the reinforcing steel bars when the cover body moves upwards;

the support is of a square annular structure with four first frames, grooves are formed in the first frames, a plurality of first steel bar through holes are formed in the bottom surfaces of the grooves, and two positioning grooves are formed in the outer sides of the first steel bar through holes;

the clamping block comprises a first clamping jaw and a second clamping jaw, the clamping jaws comprise wedge-shaped main body parts and supporting parts located below the main body, the wedge-shaped main body parts comprise top surfaces, bottom surfaces and four side surfaces, the size of the bottom surfaces close to the supporting parts is small, the size of the top surfaces far away from the supporting parts is large, two opposite surfaces in the four side surfaces are parallel, the other two side surfaces comprise a front surface perpendicular to the top surfaces and the bottom surfaces and a back surface inclined relative to the front surface, and notches with arc-shaped sections are arranged on the front surface;

the supporting parts of the first jaw and the second jaw are installed in the two positioning grooves, and the notch of the first jaw and the notch of the second jaw are oppositely arranged;

the cover body is of a square annular structure with four second frames, a plurality of second steel bar through holes are formed in the second frames, the second steel bar through holes are aligned with the first steel bar through holes, two fixing through holes are formed around the second steel bar through holes, and two groups of lifting driving devices are connected to the positions of the two fixing through holes;

each group of lifting driving devices comprises a driving piece which is of a wedge-shaped structure with a small upper part and a big lower part and comprises an inclined surface, and the inclined surface is matched with the inclined back surface of the clamping jaw.

2. The positioning device of claim 1, wherein: the support is provided with a first limiting part, the cover body is provided with a second limiting part, the first limiting part is a groove at a position with a certain distance from the edge of the support, the second limiting part is a protrusion extending downwards from the position with a certain distance from the edge of the cover body, and the protrusion can be inserted into the groove and is in sliding contact with the side wall of the groove.

3. The positioning device of claim 2, wherein: the four first frames are provided with first limiting parts, and the four second frames are provided with second limiting parts.

4. A method of positioning precast bridge reinforcing bars, using the positioning apparatus of any one of claims 1 to 3, the method comprising: firstly, fixing a lifting driving device on a cover body;