Longitudinal prestress corrugated pipe positioning device for road prefabricated box girder
By pre-welding corrugated pipes to the steel reinforcement cage and using welding fixtures, the problems of large errors, time-consuming and labor-intensive processes, and easy burns during welding in traditional positioning methods are solved, achieving efficient and accurate corrugated pipe positioning.
Patent Information
- Application Number
- CN202422157436.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-09-04
AI Technical Summary
Traditional methods for positioning prestressed corrugated pipes rely on workers' experience and manual measuring tools, resulting in large positioning errors, time-consuming and labor-intensive processes, and the prestressed corrugated pipes are easily burned during welding.
A longitudinal prestressed corrugated pipe positioning device for precast box girders of highways is designed. The device involves pre-welding corrugated pipe positioning bars onto the steel reinforcement skeleton, fixing the stirrups and corrugated pipe positioning bars using welding jigs, and positioning the device by calculating coordinate values based on the precast box girder design drawings.
It reduces manual operations during construction, improves positioning accuracy and construction efficiency, and avoids welding errors and corrugated pipe burn problems.
Smart Images
Figure CN223749912U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of prefabricated box girder, and specifically relates to a longitudinal prestressed corrugated pipe positioning device for highway prefabricated box girder. BACKGROUND
[0002] The prefabricated box girder is the main load-bearing component of the bridge structure, which is transported to the construction site for installation after being prefabricated in the factory. The prestressed steel bundle is high-strength steel material used for applying prestress, which is usually arranged inside the prefabricated box girder to provide additional load-carrying capacity and crack resistance for the box girder after tensioning. The prestressed corrugated pipe 2 is a protective channel for wrapping the prestressed steel bundle, which ensures that the steel bundle can move freely during the tensioning process and prevents direct contact between the steel bundle and the concrete. The three are closely related, the prestressed corrugated pipe 2 protects and positions the prestressed steel bundle, and the prestressed steel bundle enhances the strength and durability of the prefabricated box girder by applying prestress. During the process of binding the non-prestressed steel reinforcement framework of the prefabricated box girder, the prestressed corrugated pipe 2 is usually directly welded on the non-prestressed steel reinforcement framework.
[0003] In combination with Figure 1 , Figure 2 , Figure 3 , the structural steel bars related to the prestressed corrugated pipe 2 in the non-prestressed steel reinforcement framework include the main reinforcement 11, the stirrup 12, the corrugated pipe positioning steel bar 13, and the corrugated pipe fixing steel bar. The main reinforcement 11 is a main load-bearing bar that longitudinally penetrates the entire box girder, which is usually arranged in the top plate, bottom plate, and web of the box girder. The stirrup 12 is usually arranged in the web of the box girder in a ring or rectangular shape around the main reinforcement 11, which is used to bear shear force and maintain the integrity of the steel reinforcement framework. The corrugated pipe positioning steel bar 13 is used to accurately position the height and horizontal position of the prestressed corrugated pipe 2, which is usually horizontally welded on the stirrup 12. The corrugated pipe fixing steel bar is not shown in the figure, which is usually processed into a U-shaped structure and welded on the corrugated pipe positioning steel bar 13 to form a stirrup that fixes the prestressed corrugated pipe 2 and the stirrup 12. The corrugated pipe fixing steel bar is used to avoid direct contact between the welding gun and the prestressed corrugated pipe 2, thereby preventing the prestressed corrugated pipe 2 from being burned through.
[0004] The traditional positioning method for the longitudinal prestressed corrugated pipe 2 of the highway prefabricated box girder is as follows: after the non-prestressed steel reinforcement framework is bound and the prestressed corrugated pipe 2 is installed, the position of the corrugated pipe positioning steel bar 13 is determined according to the X, Y, and Z three-dimensional coordinates of the prestressed corrugated pipe 2 and measured by using a manual gauge, and the corrugated pipe positioning steel bar 13 is fixed by spot welding with the steel reinforcement framework.
[0005] The defect of the traditional positioning method is that the positioning of the corrugated pipe positioning steel bar 13 relies on the experience and manual gauge of the workers, and the position of each corrugated pipe positioning steel bar 13 needs to be measured and determined one by one, which not only has large errors and is time-consuming and laborious, but also is easy to burn the prestressed corrugated pipe 2 during welding. Utility Model Content
[0006] The purpose of this utility model is to provide a positioning device for longitudinal prestressed corrugated pipes of precast box girders for highways, in order to solve the problem that the traditional positioning device for prestressed corrugated pipes is formed after the prestressed corrugated pipes are tied, which requires construction workers to manually measure and determine the position of each corrugated pipe positioning steel bar one by one. This not only results in large errors and is time-consuming and labor-intensive, but also makes it easy to burn the prestressed corrugated pipes during welding.
[0007] To solve the above-mentioned technical problems, this utility model specifically provides the following technical solution:
[0008] A longitudinal prestressed corrugated pipe positioning device for precast box girders of highways includes a steel reinforcement cage for the precast box girder. Corrugated pipe positioning reinforcement bars are pre-welded onto the stirrups of the steel reinforcement cage. The installation position of the prestressed corrugated pipe is determined according to the position of the corrugated pipe positioning reinforcement bars. The position of each corrugated pipe positioning reinforcement bar is determined according to the three-dimensional coordinates of the prestressed steel strands in the design drawing of the precast box girder.
[0009] Furthermore, a corrugated pipe fixing reinforcement bar is welded onto the corrugated pipe positioning reinforcement bar. The corrugated pipe fixing reinforcement bar is U-shaped, and the corrugated pipe positioning reinforcement bar and the corrugated pipe fixing reinforcement bar form a clamp to fix the prestressed corrugated pipe.
[0010] Furthermore, the inner diameter of the bend in the corrugated pipe that fixes the reinforcing bar is equal to the outer diameter of the prestressed corrugated pipe.
[0011] Further, the step of determining the position of the corrugated pipe positioning reinforcement includes: setting the length direction, width direction, and height direction of the precast box girder as the X-axis, Y-axis, and Z-axis, respectively; calculating the XZ coordinate value of each prestressed corrugated pipe according to the three-dimensional coordinates of the prestressed steel strands in the precast box girder design drawing; then calculating the XZ coordinate value of each corrugated pipe positioning reinforcement according to the XZ coordinate value of the prestressed corrugated pipe; simplifying the XZ coordinate value of each corrugated pipe positioning reinforcement to the number of the stirrup welded to the corrugated pipe positioning reinforcement and the Z coordinate value of the corrugated pipe positioning reinforcement, thereby obtaining the number of corrugated pipe positioning reinforcements welded to each numbered stirrup and their Z coordinate values.
[0012] Furthermore, it also includes a welding fixture for positioning and welding the stirrups and the corrugated pipe positioning bars. The welding fixture is made according to the welding design drawing, which is drawn based on the dimensions of the stirrups in the precast box girder design drawing, as well as the calculated number and Z-coordinate value of the corrugated pipe positioning bars.
[0013] Further, the welding jig comprises a base, a rest and a bracket, the surface of the rest is formed with a plurality of clamping grooves, the plurality of clamping grooves are arranged side by side on the rest along the horizontal direction, the clamping groove is provided with two side walls perpendicular to the surface of the rest, the distance between the two side walls is equal to the shortest distance of the two hypotenuses of the stirrup, and the bracket is welded inside the clamping groove, and the distance between the lowest part of each bracket and the bottom edge of the rest is the Z coordinate value of the corrugated pipe positioning steel bar.
[0014] Further, the surface of the rest is an inclined surface, and the side wall is located in a vertical plane.
[0015] Further, the welding jig comprises a horizontally arranged cross beam, the rest is provided with two and symmetrically arranged, and the top end of the rest is welded on the cross beam.
[0016] Further, the rest comprises a first steel plate and a second steel plate perpendicular to each other, the first steel plate is used for supporting the stirrup, the second steel plate forms the side wall of the clamping groove to clamp the two hypotenuses of the stirrup, and the bracket comprises a third steel plate and a fourth steel plate perpendicular to each other, the two ends of the third steel plate are connected to the two first steel plates by welding, and the two ends of the third steel plate and the second steel plate are left with a gap for the hypotenuse of the stirrup to be inserted.
[0017] Further, the thickness of the third steel plate is smaller than the diameter of the stirrup.
[0018] Compared with the prior art, the present application has the following beneficial effects:
[0019] The present application provides a longitudinal prestressed corrugated pipe positioning device for a highway prefabricated box girder, the position of each corrugated pipe positioning steel bar is calculated in advance, and the corrugated pipe positioning steel bar is welded on the corresponding stirrup in advance, so that the problem caused by the installation of the prestressed corrugated pipe and then the welding of the prestressed corrugated pipe positioning device is solved. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can also be obtained according to the provided drawings without creative labor.
[0021] Figure 1 It is a perspective view of part of the structure of the prestressed corrugated pipe and the connected steel reinforcement cage of the prefabricated box girder;
[0022] Figure 2It is a side view of partial structure of prestressed corrugated pipe and its connected steel reinforcement framework of the prefabricated box girder;
[0023] Figure 3 It is a front view of partial structure of prestressed corrugated pipe and its connected steel reinforcement framework of the prefabricated box girder;
[0024] Figure 4 It is a welding design drawing of the embodiment of the utility model;
[0025] Figure 5 It is a perspective view of the welding fixture of the embodiment of the utility model, and an enlarged view of partial structure thereof;
[0026] The reference numerals in the drawing represent the following respectively:
[0027] 11-main reinforcement; 12-stirrup; 13-corrugated pipe positioning reinforcement; 2-prestressed corrugated pipe; 3-welding fixture; 31-base; 32-backrest; 321-first steel plate; 322-second steel plate; 33-carriage; 331-third steel plate; 332-fourth steel plate; 34-cross beam. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0029] The defect of the traditional positioning device is that the construction personnel need to install the prestressed corrugated pipe 2 on the steel reinforcement framework of the prefabricated box girder first, and then weld the positioning device of the prestressed corrugated pipe 2, so that the construction personnel need to measure and determine the position of each corrugated pipe positioning reinforcement 13 one by one, which not only has large error, consumes time and effort, and is easy to burn the prestressed corrugated pipe 2 when welding.
[0030] In order to solve the defect of the traditional positioning device, the embodiment provides a longitudinal prestressed corrugated pipe positioning device for highway prefabricated box girder, the main idea of which is to calculate the length, height of the corrugated pipe positioning reinforcement 13 and the number of the corresponding stirrup 12 according to the "Design Structure Drawing of Prefabricated Box Girder Steel Beam", and to weld the corrugated pipe positioning reinforcement 13 on the stirrup 12 in advance before binding the stirrup 12 on the steel reinforcement framework, so as to transfer the work of welding the corrugated pipe positioning reinforcement 13 from the front field to the back field, and cancel the process of manually measuring and welding the corrugated pipe positioning reinforcement 13 after binding the stirrup 12.
[0031] In combination with Figure 1 , Figure 2 , Figure 3The specific steps of the positioning method of the longitudinal prestressed corrugated pipe of the highway precast box girder are:
[0032] S1, the length direction, width direction and height direction of the precast box girder are respectively set as X axis, Y axis and Z axis, the XYZ coordinate values of each prestressed steel strand are calculated according to the prestressed steel strand design structure diagram, and the XYZ coordinate values of each prestressed corrugated pipe 2 sleeved outside each prestressed steel strand are obtained.
[0033] S2, since several stirrups 12 are arranged along the X axis direction, the stirrups 12 at a distance of 1 meter, 2 meters and 3 meters from the starting point of the steel framework are marked as 1#, 2# and 3# respectively, and the X axis coordinate value is simplified as the number of the stirrup 12, in addition, since the Y coordinate value of the prestressed corrugated pipe 2 only corresponds to the left side and the right side of the precast box girder, and the stirrup 12 is symmetrical in the precast box girder, the Y coordinate value can be ignored, and the XYZ coordinate value of the prestressed corrugated pipe 2 at a distance of 3 meters from the starting point of the steel framework can be simply recorded as 3#Z, it should be noted that if the integer multiple of the distance between the two adjacent stirrups 12 is not 1 meter, for example, it is 1.2 meters, then the stirrups 12 at a distance of 1.2 meters, 2.4 meters and 3.6 meters from the starting point of the steel framework are marked as 1#, 2# and 3# respectively.
[0034] S3, the length of the corrugated pipe positioning steel bar 13 welded on each numbered stirrup 12 is calculated according to the width of the stirrup 12, and the length of the corrugated pipe positioning steel bar 13 is usually equal to the width of the stirrup 12, before binding the stirrup 12 on the steel framework, the corrugated pipe positioning steel bar 13 is welded on the stirrup 12 in advance, for example, the construction personnel know that the corrugated pipe positioning steel bar 13 needs to be welded at the Z coordinate value of the stirrup 12 numbered 3# according to the coordinate value 3#Z, if there are two corrugated pipe positioning steel bars 13 welded on the stirrup 12 numbered 3#, the two corrugated pipe positioning steel bars 13 are marked as 3#Z1 and 3#Z2 respectively, so that the bound steel framework has the corrugated pipe positioning steel bar 13 welded in advance, without subsequent manual measurement and welding.
[0035] Compared with the traditional positioning method, the embodiment relies more on the pre-designed and standardized jig assembly process, which not only reduces the manual operation in construction, but also improves the quality control ability of the overall construction.
[0036] In order to facilitate the construction personnel to find the relative position relationship between each stirrup 12 and each corrugated pipe positioning steel bar 13, the positioning method of the longitudinal prestressed corrugated pipe of the highway precast box girder can be further simplified, referring to Figure 4 If each stirrup 12 parallel to each other is rotated by 90° along the vertical line, each stirrup 12 is laid flat on a plane in order along its own number, and the hypotenuse of each stirrup 12 is rotated to be vertical, then the relative position relationship between each stirrup 12 and each corrugated pipe positioning steel bar 13 can be obtained as Figure 4The welding design shown.
[0037] The welder only needs to position the stirrup 12 and the corrugated pipe positioning steel bar 13 according to the welding design shown. Figure 4 The structure shown is placed, positioned and aligned, and then the stirrup 12 and the corrugated pipe positioning steel bar 13 are welded together, so that the required stirrup 12 pre-welded with the corrugated pipe positioning steel bar 13 is easily obtained, and for this purpose, a corresponding welding jig 3 needs to be designed and used.
[0038] In combination Figure 5 , the welding jig 3 comprises a base 31, a rest 32 and a bracket 33.
[0039] The base 31 is a rectangular frame formed by welding four channel steels, the rest 32 is fixed on the base 31 obliquely, the rest 32 usually has two and is symmetrically dependent on each other, the top ends of the two rests 32 are welded and connected by a horizontal cross beam 34, the rest 32, the base 31 and the cross beam 34 form a firm three-dimensional triangular structure, the surface of the rest 32 is formed with a plurality of clamping grooves, the plurality of clamping grooves are arranged side by side on the rest 32 along the horizontal direction, the clamping groove has two side walls perpendicular to the surface of the rest 32, the distance between the two side walls is equal to the shortest distance of the two oblique sides of the stirrup 12, and the bracket 33 is welded inside each clamping groove. When there are a plurality of brackets 33 inside a clamping groove, the plurality of brackets 33 are arranged side by side along the vertical direction, and the distance between the lowest part of each bracket 33 and the bottom edge of the rest 32 is the Z coordinate value.
[0040] The rest 32 is used to lean against the stirrup 12, the two oblique sides of the stirrup 12 respectively abut against the two side walls of the clamping groove, and the bottom of the stirrup 12 abuts against the base 31. The bracket 33 is used to support the corrugated pipe positioning steel bar 13, the two ends of the corrugated pipe positioning steel bar 13 respectively abut against the two side walls of the clamping groove, after the stirrup 12 and the corrugated pipe positioning steel bar 13 are positioned by the welding jig 3, the construction personnel weld the stirrup 12 and the corrugated pipe positioning steel bar 13 together, then the welded stirrup 12 is taken off from the welding jig 3, and the stirrup 12 can be transferred to the binding mold of the steel reinforcement framework of the prefabricated box girder.
[0041] Among them, the rest 32 and the bracket 33 are both made of angle steel, so that the welding jig 3 has a lightweight structure and good heat dissipation, and is easy to move and use.
[0042] Specifically, the support 32 comprises a first steel plate 321 and a second steel plate 322 which are perpendicular to each other, wherein the first steel plate 321 is used for supporting the stirrup 12, and the second steel plate 322 serves as a side wall of the clamping groove to clamp two inclined edges of the stirrup 12; the bracket 33 comprises a third steel plate 331 and a fourth steel plate 332 which are perpendicular to each other, wherein two ends of the third steel plate 331 are adhered to and welded to the two first steel plates 321, and a gap is left between the two ends of the third steel plate 331 and the second steel plate 322, so that the inclined edges of the stirrup 12 can be inserted into the gap; and the third steel plate 331 and the fourth steel plate 332 constitute a groove for supporting the corrugated pipe positioning steel bar 13, and since the thickness of the third steel plate 331 is less than the diameter of the stirrup 12, when the corrugated pipe positioning steel bar 13 is placed in the groove, the two ends of the corrugated pipe positioning steel bar 13 can contact the two inclined edges of the stirrup 12.
[0043] The above embodiments are only exemplary embodiments of the utility model, and are not used for limiting the utility model, and the protection scope of the utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the utility model within the essence and protection scope of the utility model, and the modification or equivalent replacement should also be regarded as falling within the protection scope of the utility model embodiments.
Claims
1. A longitudinal prestressed corrugated pipe positioning device for a highway precast box girder, characterized in that it comprises a reinforcement cage of a precast box girder, corrugated pipe positioning reinforcement (13) is pre-welded on the stirrup (12) of the reinforcement cage, the installation position of the prestressed corrugated pipe (2) is determined according to the position of the corrugated pipe positioning reinforcement (13), and the position of each corrugated pipe positioning reinforcement (13) is determined according to the three-dimensional coordinates of the prestressed tendon in the precast box girder design drawing.
2. The longitudinal prestressed corrugated pipe positioning device for a highway precast box girder according to claim 1, characterized in that the corrugated pipe positioning reinforcement (13) is welded with corrugated pipe fixing reinforcement, the corrugated pipe fixing reinforcement is in the shape of a U, and the corrugated pipe positioning reinforcement (13) and the corrugated pipe fixing reinforcement form a hoop for fixing the prestressed corrugated pipe (2).
3. The longitudinal prestressed corrugated pipe positioning device for a highway precast box girder according to claim 2, characterized in that the inner diameter of the bend of the corrugated pipe fixing reinforcement is equal to the outer diameter of the prestressed corrugated pipe (2).
4. The longitudinal prestressed corrugated pipe positioning device for a highway precast box girder according to claim 1, characterized in that it further comprises a welding jig (3) for positioning and welding the stirrup (12) and the corrugated pipe positioning reinforcement (13), wherein the welding jig (3) is made according to a welding design drawing, and the welding design drawing is drawn according to the size of the stirrup (12) in the precast box girder design drawing and the number and Z coordinate value of the corrugated pipe positioning reinforcement (13) calculated.
5. The longitudinal prestressed corrugated pipe positioning device for a highway precast box girder according to claim 4, characterized in that The welding jig (3) comprises a base (31), a support (32) and a bracket (33), the surface of the support (32) is formed with a plurality of clamping grooves, the plurality of clamping grooves are arranged side by side on the support (32) along the horizontal direction, the clamping groove is provided with two side walls perpendicular to the surface of the support (32), the distance between the two side walls is equal to the shortest distance of the two oblique edges of the stirrup (12), the bracket (33) is welded inside the clamping groove, and the distance between the lowest part of each bracket (33) and the bottom edge of the support (32) is the Z coordinate value of the corrugated pipe positioning steel bar (13).
6. The longitudinal prestressed corrugated pipe positioning device for highway prefabricated box girder according to claim 5, characterized in that, The surface of the support (32) is an inclined surface, and the side wall is located in a vertical plane.
7. The longitudinal prestressed corrugated pipe positioning device for highway prefabricated box girder according to claim 5, characterized in that, The welding jig (3) comprises a horizontally arranged cross beam (34), the support (32) is provided with two and symmetrically arranged, and the top end of the support (32) is welded on the cross beam (34).
8. The longitudinal prestressed corrugated pipe positioning device for highway prefabricated box girder according to claim 5, characterized in that, The support (32) comprises a first steel plate (321) and a second steel plate (322) perpendicular to each other, the first steel plate (321) is used for supporting the stirrup (12), the second steel plate (322) forms the side wall of the clamping groove to clamp the two oblique edges of the stirrup (12), the bracket (33) comprises a third steel plate (331) and a fourth steel plate (332) perpendicular to each other, the two ends of the third steel plate (331) are connected by welding to the two first steel plates (321), and the two ends of the third steel plate (331) and the second steel plate (322) are left with a gap for the oblique edges of the stirrup (12) to be inserted into.
9. The longitudinal prestressed corrugated pipe positioning device for highway prefabricated box girder according to claim 8, characterized in that, The thickness of the third steel plate (331) is less than the diameter of the stirrup (12).