Matching and splicing method for short-line-method prestressed concrete segmental beams

Abstract

The invention provides a matching and splicing method for a short-line-method prestressed concrete segmental beam, and relates to the field of traffic civil engineering, and the matching and splicing method comprises the following steps: determining an initial control point coordinate; adjusting the posture of the beam body according to the linear control requirement, measuring a plurality of control points after the posture of the beam body is adjusted, and obtaining the coordinates of all the control points according to the coordinate corresponding relation; calculating the width of the abutted seam according to the offset of the coordinates of the control points after the posture is adjusted every time until the width of the abutted seam meets the design requirement; fixing the self-adaptive spiral positioning device; after the width of the abutted seam is fixed, the to-be-matched segmental beam is moved away, the abutted seam is exposed, and the abutted seam surface is treated and smeared with structural adhesive; and splicing the to-be-matched segmental beam again, completing prestress application, ensuring that the pressure stress of the glue joint surface meets the design requirement, and keeping the load until the structural glue is completely hardened. The assembling method provided by the invention has the advantages of accurately controlling the line shape of the beam body, accurately adjusting the construction error, adaptively controlling the thickness of the abutted seam and the like.

Description

Technical Field

[0001] The present invention relates to the field of transportation civil engineering, and in particular to a matching and assembling method for short-line prestressed concrete segment beams. Background Art

[0002] The short-line prestressed concrete matching assembly technology is mainly used for the installation of large-span spatial structures. Due to the shrinkage and creep of concrete segmental beams constructed using the short-line method, deformation and settlement of assembly brackets, insufficient formwork construction accuracy, insufficient pre-camber setting, and polishing of adhesive surfaces, structural alignment adjustments are still required during the matching assembly stage. Traditional construction methods require repeated trial assembly and the addition of joint gaskets, which not only have poor accuracy and extremely low efficiency in repeated construction, but also inconsistent gasket placement, which can easily lead to a decrease in joint construction quality and durability. Therefore, how to design a control method for the matching assembly of short-line prestressed concrete segmental beams has become a technical problem that needs to be solved. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art, and discloses a matching assembly method for short-line prestressed concrete segmental beams, which can meet the precision control requirements of the bridge line shape while ensuring structural safety and joint quality.

[0004] The first aspect of the present invention discloses a matching and assembling method for short-line prestressed concrete segmental beams, comprising: when the segmental beam to be matched is deployed in place and the beam cross sections are in full contact, a plurality of measurable points at both ends of the segmental beam to be matched are selected as control points, the coordinates of the control points are tested and recorded as initial control point coordinates, and the coordinate correspondence between the plurality of control points is determined; the beam posture of the segmental beam to be matched is adjusted so that the coordinates of the control points at the front end of the beam meet the linear control requirements; after the beam posture is adjusted, the plurality of control points are measured, and the coordinates of all control points are obtained according to the coordinate correspondence. Coordinates are used as the coordinates of the control points after posture adjustment; the joint width is calculated based on the coordinates of the control points after posture adjustment and the coordinates of the initial control points, and the joint width is made to meet the design standards after one or more posture adjustments; the adaptive spiral positioning device embedded in the end of the segment beam is adjusted to press against the gap, and a quick-hardening slurry is poured into the internal cavity of the adaptive spiral positioning device for solidification; after fixing the joint width, the segment beam to be matched is removed to expose the joint, the joint surface is processed and structural adhesive is applied; the segment beam to be matched is assembled again and the prestressing is completed to ensure that the compressive stress on the bonding surface meets the design requirements, and the load is maintained until the structural adhesive is completely hardened.

[0005] In this technical solution, the matching beam is in place and controlled by four sets of three-dimensional adjustment jacks; the control coordinates of the outer end of the beam are adjusted according to the requirements of the prefabricated line shape; the joint width is calculated based on the difference between the in-place coordinates and the coordinates after adjustment, and it is determined whether the joint width requirement exceeds the design standard; if the joint width exceeds the design standard, it is adjusted in batches according to the excess amount. If the joint width does not exceed the design standard, after the coordinates of the matching beam end are determined, the jacks are locked and the beam is temporarily fixed. At this time, the joint thickness has been revealed, and the embedded adaptive spiral positioning device at the beam end is adjusted to press against the gap, and the internal cavity is quickly filled with quick-hardening slurry to solidify; after the adaptive spiral positioning device hardens, the matching beam is removed, and after processing the glue joint surface (bonded surface), structural glue is applied and temporary external prestressing is completed to ensure that the compressive stress of the glue joint surface meets the design requirements, and the load is maintained until the structural glue is completely hardened to complete the adjustment of the matching beam line shape of the current segment.

[0006] According to the matching assembly method for short-line prestressed concrete segmental beams disclosed in the present invention, preferably, the control points are distributed circumferentially on the cross-section of the segmental beam body so that control points are provided on both the upper surface and the bottom surface of the segmental beam.

[0007] According to the matching and assembling method for short-line prestressed concrete segmental beams disclosed in the present invention, preferably, at least 3 control points are set at the intersection of the cross-section of the segmental beam to be matched and the upper surface, and at least 3 control points are set at the intersection of the cross-section of the segmental beam to be matched and the bottom surface, and a total of 12 control points are set on the two cross-sections at both ends of the beam body.

[0008] According to the matching and assembling method for short-line prestressed concrete segmental beams disclosed in the present invention, preferably, the control points include upper surface control points and bottom surface control points, the upper surface control points are located at the top of the web and the ends of the flange plates on both sides of the segmental beam to be matched, and the bottom surface control points are located directly below the web.

[0009] According to the matching assembly method for short-line prestressed concrete segmental beams disclosed in the present invention, preferably, the process of calculating the joint width specifically includes: taking the initial control point coordinates of the control point at the joint and the corresponding control point coordinates after posture adjustment, and calculating the offset distance between the two control points as the joint width according to the coordinate distance calculation formula; replacing different control points to calculate multiple joint widths.

[0010] According to the matching assembly method for short-line prestressed concrete segmental beams disclosed in the present invention, preferably, the step of making the joint width meet the design standard after one or more posture adjustments specifically includes: obtaining multiple joint widths by calculating the offsets of multiple control points, and if all joint widths meet the design requirements, completing the posture adjustment; if there are one or more joint widths that do not meet the design requirements, performing multiple posture adjustments until the width of each joint meets the design requirements.

[0011] According to the matching assembly method for short-line prestressed concrete segmental beams disclosed in the present invention, preferably, it also includes: maintaining the pressure on the bonding surface until the structural adhesive is completely hardened and then tensioning the permanent prestress.

[0012] According to the matching assembly method for short-line prestressed concrete segmental beams disclosed in the present invention, preferably, it also includes: after the segmental beams are assembled and the base plate is installed, measuring the coordinates of the control points on the upper surface of the segmental beams, and calculating the coordinates of the control points on the bottom surface of the segmental beams based on the coordinates of the upper surface control points and the coordinate correspondence, and performing calculation verification based on the coordinates of the control points at the splicing points.

[0013] The beneficial effects of the present invention include at least calculating the increment of the joint width by the offset of the key control coordinates of the beam body, and controlling the adjustment amount by controlling the maximum limit of the joint width. When the matching assembly error is small, the beam body can be precisely adjusted to the position with a single movement. When the matching assembly error is large, the single adjustment amount can be limited by limiting the maximum joint width, and the remaining error is amortized and adjusted through subsequent beams, thus meeting the precision control requirements of the bridge alignment while ensuring structural safety and joint quality. The matching assembly method provided by the present invention has the advantages of accurately adjusting the beam body state, accurately correcting construction errors, adaptively controlling the joint width, and effectively reducing the adjustment amount required during trial assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic flow chart of a matching assembly method for short-line prestressed concrete segmental beams according to an embodiment of the present invention is shown.

[0015] Figure 2 A schematic diagram of control point distribution according to an embodiment of the present invention is shown.

[0016] Figure 3 A schematic diagram of control points after posture adjustment according to an embodiment of the present invention is shown.

[0017] Figure 4 A schematic diagram of a seam state according to an embodiment of the present invention is shown.

[0018] Figure 5 A schematic diagram of the structure of an adaptive spiral adjustment device according to an embodiment of the present invention is shown.

[0019] Figure 6 A schematic diagram of the adjustment state of an adaptive spiral adjustment device according to an embodiment of the present invention is shown.

[0020] Figure 7 A schematic diagram of grouting completion of an adaptive spiral adjustment device according to an embodiment of the present invention is shown.

[0021] Figure 8A matching assembly adjustment logic flow chart according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] like Figure 1 As shown, according to one embodiment of the present invention, a matching assembly method for short-line prestressed concrete segmental beams is disclosed, comprising:

[0024] Step S1, determining the coordinates of the initial control points: When the segmental beam to be matched is deployed in place and the beam sections are in full contact, multiple measurable points at both ends of the segmental beam to be matched are selected as control points. The coordinates of the control points are tested and recorded as the initial control point coordinates, and the coordinate correspondence between the multiple control points is determined;

[0025] Step S2, posture adjustment: adjust the posture of the segmental beam to be matched so that the coordinates of the control point at the front end of the beam meet the linear control requirements. After the posture of the beam is adjusted, measure multiple control points and obtain the coordinates of all control points based on the coordinate correspondence as the coordinates of the control points after the posture adjustment.

[0026] Step S3, calculating and comparing the seam width: calculating the seam width based on the coordinates of the control points after posture adjustment and the coordinates of the initial control points, and adjusting the posture one or more times to make the seam width meet the design standard;

[0027] Step S4, fixing the adaptive spiral positioning device: adjusting the adaptive spiral positioning device embedded in the end of the segment beam to press against the gap, and pouring a quick-hardening slurry into the internal cavity of the adaptive spiral positioning device for solidification;

[0028] Step S5, applying structural adhesive: after fixing the joint width, remove the segmental beam to be matched to expose the joint, process the joint surface and apply structural adhesive;

[0029] Step S6, applying prestress: assemble the segmental beams to be matched again and complete the prestressing to ensure that the compressive stress of the adhesive joint meets the design requirements, and hold the load until the structural adhesive is completely hardened.

[0030] This embodiment calculates the increment of the joint width by the offset of the key control coordinates of the beam body, and controls the adjustment amount by controlling the maximum limit of the joint width. When the matching assembly error is small, the beam body can be precisely adjusted to the position with a single movement. When the matching assembly error is large, the single adjustment amount can be limited by limiting the maximum joint width, and the remaining error is amortized and adjusted through subsequent beam bodies, thereby meeting the precision control requirements of the bridge line shape while ensuring structural safety and joint quality.

[0031] According to the above embodiment, further, the control points are distributed along the circumferential direction on the cross section of the segmental beam, so that the control points are provided on both the upper surface and the bottom surface of the segmental beam.

[0032] According to the above embodiment, further, at least 3 control points are set at the intersection of the cross section of the segment beam to be matched and the upper surface, and at least 3 control points are set at the intersection of the cross section of the segment beam to be matched and the bottom surface. A total of 12 control points are set on the two cross sections at both ends of the beam body.

[0033] According to the above embodiment, further, the control points include upper surface control points and bottom surface control points. The upper surface control points are located at the top of the web and the ends of the flanges on both sides of the segmental beam to be matched, and the bottom surface control points are located directly below the web.

[0034] According to the above embodiment, further, the process of calculating the seam width specifically includes:

[0035] Take the initial control point coordinates of the control point at the joint and the corresponding control point coordinates after posture adjustment, and calculate the offset distance between the two control points according to the coordinate distance calculation formula as the seam width; replace different control points and calculate multiple seam widths.

[0036] According to the above embodiment, further, step S3 specifically includes: obtaining multiple seam widths by calculating the offsets of multiple control points, and if all seam widths meet the design requirements, completing the posture adjustment; if there are one or more seam widths that do not meet the design requirements, performing multiple posture adjustments until each seam width meets the design requirements.

[0037] According to the above embodiment, further, the method further includes: maintaining the pressure on the bonding surface until the structural adhesive is completely hardened and then tensioning the permanent prestress.

[0038] According to the above embodiment, it further includes: after the segmental beam is assembled and the base plate is installed, the coordinates of the control points on the upper surface of the segmental beam are measured, and the coordinates of the control points on the bottom surface of the segmental beam are calculated based on the coordinates of the upper surface control points and the coordinate correspondence, and the calculation is verified based on the coordinates of the control points at the splicing point.

[0039] like Figures 2 to 7As shown, according to one embodiment of the present invention, the application of the matching assembly method for short-line prestressed concrete segment beams of the above embodiment in an actual construction process is also disclosed:

[0040] (1) Figure 2 As shown in the figure, 12 key control positioning points (control points) on both sides of the beam section of the segmental beam to be matched are tested (measured), 3 on the top plate and 3 on the bottom plate of each side section, the top plate is set at the top of the middle web and the ends of the flange plates on both sides, and the bottom plate is set just below the web. After the test is completed, 6 control points of the top plate are retained (the bottom plate cannot be re-measured after assembly), and the difference between the corresponding bottom plate control coordinate points is calculated, and the top plate measuring points A1, A2 and A3 are mapped to the bottom plate measuring points A4, A5 and A6 in space. The vertical corresponding groups are A1-A4, A2-A5, A3-A6; because the bottom plate coordinates are not convenient for later observation, in order to facilitate later calculation and verification, the bottom plate coordinates are changed to the top plate coordinates plus the difference expression; for example: if the A1 coordinates are (x1, y1, z1), and the A4 coordinates are (x4, y4, z4), the A4 coordinates are converted to the A1 coordinates plus the difference expression: A4 [x1-(x1-x4), y1-(y1-y4), z1-(z1-z4)].

[0041] (2) Due to the matching prefabrication, the matching prefabricated seam between the matching beam (beam body that has been precisely positioned) and the matching beam body can be seamlessly spliced under normal circumstances. However, considering the construction error and linear control, the segment beam end linear shape needs to be adjusted. Therefore, the control coordinates of the front end of the segment beam to be matched need to be adjusted. That is, the rigid body rotation of the matching beam segment causes the control coordinates of the free end to change, which in turn causes the variables of the matching seam gap and angle. The change in seam thickness is obtained according to the transformation relationship of the beam body control coordinates.

[0042] like Figure 3 As shown, try to assemble the matching beam segments. Under the premise of keeping the splicing surface fully spliced, adjust the coordinates of the front end A1, A2, and A3 of the beam body so that its position meets the requirements of the target line shape of the bridge. At this time, the matching beam body undergoes rigid body rotation. The posture adjustment will cause the coordinate positions of the six control points A1~A3 and B1~B3 at the end of the matching beam to change. The changed coordinates are AA1~AA3, BB1~BB3; all 12 changed coordinates, i.e. AA1~AA6, BB1~BB6, are obtained through the base plate coordinate conversion formula in step (1);

[0043] (3) Compare AA1 to AA6 to determine whether their coordinate positions are consistent with the bridge alignment control requirements; if the control accuracy of AA1 to AA6 meets the bridge alignment control requirements, lock the three-dimensional control jack;

[0044] The beam posture is adjusted into place and the joint status is as follows Figure 4As shown, compare the numerical relationship between BB1~BB6 and B1~B6, and use the coordinate distance formula to calculate the joint width:

[0045]

[0046] Where D represents the joint width, x1, y1, and z1 are the initial position coordinates, and x2, y2, and z2 are the coordinates after attitude adjustment. The six joint widths at the top and bottom plate midpoints and edges, D1 to D6, are obtained. The joint widths at other locations can be obtained by interpolation.

[0047] (4) By comparing the values of D1 to D6 and the maximum allowable joint width Dmax of the design, if D1 to D6 are all ≤ Dmax, the beam body can be adjusted in position with one adjustment; if one or more of D1 to D6 are greater than Dmax, the beam body needs to be adjusted in position according to the principle of multiple adjustments, unlock the jack and readjust the beam body posture in the opposite direction until the adjusted joint width D1 to D6 are all ≤ Dmax, re-lock the jack, and complete the beam body posture adjustment.

[0048] (5) Lock the jack and temporarily fix the beam. At this time, the thickness of the joint has been revealed. Adjust the self-adaptive spiral positioning device embedded in the beam end to press against the gap. Figure 5 As shown, the device adjustment diagram is as follows Figure 6 As shown;

[0049] (6) After the adaptive spiral positioning device hardens, remove the matching beam body, process the glue joint interface, apply structural glue and complete the temporary external prestressing to ensure that the compressive stress of the glue joint section meets the design requirements. Hold the load until the structural glue is completely hardened and complete the alignment adjustment of the matching beam of the current segment, such as Figure 7 shown.

[0050] (7) According to the assembly methods provided in (1) to (6) above, complete the assembly and adjustment of the remaining segment beams. The overall adjustment logic and process are as follows: Figure 8 shown.

[0051] In summary, the embodiments of the present invention establish a corresponding relationship between the coordinates of the top plate and the bottom plate based on the coordinate analysis of the key points of the front and rear sections of the segmental beam; adjust the posture of the sliding beam to be matched based on the requirements of the assembly line of the sliding beam (segmental beam); calculate the relationship between the change of the control coordinates of the matching beam body and the change of the joint thickness adjustment according to the spatial coordinate transformation rules; calculate the joint thickness adjustment amount based on the coordinate adjustment amount of the matching beam body, and judge whether to adjust it into place once or multiple times; pre-assemble the segmental beam, adjust the control coordinates of the end of the matching beam body, and adaptively adjust the extension length of the spiral positioning device in the joint; remove the matching beam to expose the joint, process the joint surface, apply structural glue and then assemble the segmental beam again; tension the temporary prestress, and maintain the pressure on the bonding surface until the structural glue is completely hardened before tensioning the permanent prestress.

[0052] The present invention confirms the joint width by testing the control coordinates of the matching beam and the beam to be matched, adjusts the manufacturing error of the beam segment by adjusting the joint thickness between adjacent segment beam bodies, and accurately controls the linear shape of the entire beam segment; it has the advantages of accurately controlling the linear shape of the beam body, accurately adjusting the construction error and adaptively controlling the joint thickness.

[0053] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A matching assembly method for short-line prestressed concrete segmental beams, characterized in that: include: When the segmental beam to be matched is deployed in place and the beam sections are in full contact, multiple measurable points at both ends of the segmental beam to be matched are selected as control points, the coordinates of the control points are tested and recorded as initial control point coordinates, and the coordinate correspondence between the multiple control points is determined; Adjusting the posture of the segmented beam to be matched so that the coordinates of the control points at the front end of the beam meet the linear control requirements, after the posture of the beam is adjusted, measuring multiple control points, and obtaining the coordinates of all control points according to the coordinate correspondence as the coordinates of the control points after the posture adjustment; Calculating the seam width according to the coordinates of the control points after the posture adjustment and the coordinates of the initial control points, and adjusting the posture one or more times so that the seam width meets the design standard; Adjust the self-adaptive spiral positioning device embedded in the end of the segment beam to press against the gap, and pour the quick-hardening slurry into the internal cavity of the self-adaptive spiral positioning device for solidification; After fixing the joint width, the segmental beam to be matched is removed to expose the joint, and the joint surface is processed and structural adhesive is applied; The segmental beams to be matched are assembled again and prestressing is completed to ensure that the compressive stress of the bonding surface meets the design requirements, and the load is maintained until the structural adhesive is completely hardened.

2. The matching assembly method for short-line prestressed concrete segmental beams according to claim 1, characterized in that: The control points are distributed along the circumferential direction on the cross section of the segment beam, so that the control points are provided on both the upper surface and the bottom surface of the segment beam.

3. The matching assembly method for short-line prestressed concrete segmental beams according to claim 2, characterized in that: At least three control points are set at the intersection of the section of the segment beam to be matched and the upper surface, and at least three control points are set at the intersection of the section of the segment beam to be matched and the bottom surface. A total of 12 control points are set on the two sections at both ends of the beam body.

4. The matching assembly method for short-line prestressed concrete segmental beams according to claim 1, characterized in that: The control points include upper surface control points and bottom surface control points. The upper surface control points are located at the top of the web and the ends of the flange plates on both sides of the segmental beam to be matched, and the bottom surface control points are located directly below the web.

5. The matching assembly method for short-line prestressed concrete segmental beams according to claim 1, characterized in that: The process of calculating the seam width specifically includes: Take the initial control point coordinates of the control point at the joint and the corresponding control point coordinates after posture adjustment, and calculate the offset distance between the two control points according to the coordinate distance calculation formula as the joint width; By changing different control points, multiple seam widths can be calculated.

6. The matching assembly method for short-line prestressed concrete segmental beams according to claim 1, characterized in that: The step of adjusting the posture once or multiple times so that the seam width meets the design standard specifically includes: By calculating the offsets of multiple control points, multiple seam widths are obtained. If all seam widths meet the design requirements, the posture adjustment is completed; if one or more seam widths do not meet the design requirements, multiple posture adjustments are performed until every seam width meets the design requirements.

7. The matching assembly method for short-line prestressed concrete segmental beams according to any one of claims 1 to 6, characterized in that: Also includes: Maintain the pressure on the bonding surface until the structural adhesive is completely hardened and then apply permanent prestress.

8. The matching assembly method for short-line prestressed concrete segmental beams according to any one of claims 1 to 6, characterized in that: Also includes: After the segmental beam is assembled and the base plate is installed, the coordinates of the control points on the upper surface of the segmental beam are measured, and the coordinates of the control points on the bottom surface of the segmental beam are calculated based on the coordinates of the upper surface control points and the coordinate correspondence. The calculation is then reviewed based on the coordinates of the control points at the splicing point.

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