A formwork and construction method for a segmental box girder of a cable-stayed bridge

Abstract

This invention relates to the field of bridge construction technology, specifically disclosing a formwork and construction method for a segmental box girder of a cable-stayed bridge. The formwork includes a base, which comprises a central box girder base and two side box girder bases; and a steel reinforcement formwork, which includes bottom crossbeams, support rods, longitudinal comb plates, and transverse comb plates. Several bottom crossbeams are embedded in the base, and several support rods are welded in rows onto the bottom crossbeams. The support rods along the bridge direction are set at a height according to the bridge's longitudinal slope, and an inclined crossbeam is installed at the top of each row of support rods located on the side box girder bases. This invention sets the height of the support rods along the bridge direction according to the bridge's longitudinal slope, so that the longitudinal beams and longitudinal comb plates welded to them form a slope consistent with the bridge's longitudinal slope. After the segmental girder is poured, no longitudinal slope adjustment is required, reducing equipment investment and saving construction time.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a formwork and construction method for a segmental box girder of a cable-stayed bridge. Background Technology

[0002] The prefabrication of prestressed concrete segmental box girders requires first binding the reinforcing bars, then installing the formwork, and finally pouring the concrete. To improve construction efficiency, the longitudinal prestressing tendons of the box girder are generally straight strands, while ordinary reinforcing bars are positioned using a reinforcing bar jig. The reinforcing bars of the stay cables are bound simultaneously with the main beam reinforcing bars.

[0003] 1. The existing steel reinforcement frame does not have a longitudinal slope at the bottom, and the segmental beams are poured horizontally. The longitudinal slope of the bridge deck is adjusted during the segmental beam assembly stage. Due to the large weight of the segmental beams after pouring, the equipment investment required for longitudinal slope adjustment is large and time-consuming.

[0004] 2. When the reinforcement bars of the stay cable anchor blocks are tied simultaneously with the reinforcement bars of the main beam, the reinforcement bars in the work area are densely packed, making operation inconvenient and inefficient.

[0005] 3. The corrugated pipe has no support between its positioning points, making it easy to be squeezed, bent, and deformed during concrete pouring. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a formwork for a segmental box girder of a cable-stayed bridge, comprising:

[0007] The base includes a central chamber base and two side chamber bases;

[0008] A steel reinforcement frame, comprising a bottom crossbeam, support rods, longitudinal comb plates, and transverse comb plates;

[0009] Several bottom crossbeams are embedded in the base, several support rods are welded in rows on the bottom crossbeams, and a diagonal crossbeam is installed on the top of each row of support rods located on the side chamber base.

[0010] The bottom crossbeam includes a middle box chamber bottom crossbeam and a side box chamber bottom crossbeam. Several longitudinal beams are welded onto the inclined crossbeam and the middle box chamber bottom crossbeam. Several longitudinal comb plates located on the base of the middle box chamber are welded to each column of support rods and bottom crossbeams. Several longitudinal comb plates located on the base of the side box chamber are welded onto the inclined crossbeam.

[0011] Several transverse comb plates are vertically welded to the longitudinal beam, and the bottom of each transverse comb plate has a matching groove corresponding to the longitudinal comb plate.

[0012] It also includes a cable anchoring block frame, which includes a panel, a connecting rod, and a mounting crossbar. The connecting rod is vertically supported on the base, and the two ends of the mounting crossbar are welded to the lower end of the connecting rod and the support rod of the steel reinforcement frame, respectively.

[0013] The longitudinal comb plate and the transverse comb plate are respectively provided with a first positioning port and a second positioning port; a transverse steel bar is installed in the first positioning port of the longitudinal comb plate, and a longitudinal steel bar is installed in the second positioning port of the transverse comb plate.

[0014] It also includes two corrugated tube comb plates, which are respectively installed at both ends of the steel reinforcement frame along the bridge direction, and the two corrugated tube comb plates are vertically welded to both ends of the longitudinal beam.

[0015] The corrugated tube comb plate is provided with a third positioning port. Prestressed corrugated tubes are installed in the corresponding third positioning ports on both corrugated tube comb plates. A positioning steel pipe is inserted into the interior of the prestressed corrugated tube to keep it straight and accurately position it.

[0016] The intersections of several transverse reinforcing bars and several longitudinal reinforcing bars on the same axis are sequentially set as welded intersections every other one, and the welded intersections on two adjacent axes are staggered. On the reinforcing mesh formed by the transverse and longitudinal reinforcing bars, the welded intersections are arranged in a quincunx pattern.

[0017] The base is made of cast concrete;

[0018] The upper surface of the bottom crossbeam protrudes from the base to facilitate the welding of the support rod and the transverse comb plate. The bottom crossbeam, support rod, diagonal crossbeam, and longitudinal beam are made of channel steel.

[0019] A method for constructing a formwork for a segmental box girder of a cable-stayed bridge, comprising the aforementioned formwork for a segmental box girder of a cable-stayed bridge:

[0020] S1: Lay the base, and during the laying process, embed the bottom crossbeam of the steel reinforcement frame into the base concrete, and then carry out curing;

[0021] S2: After the foundation concrete reaches its strength, the support rods are welded to the bottom crossbeam in an orderly manner, and the inclined crossbeams are welded to the support rods located in the side box chamber.

[0022] Several longitudinal comb plates located on the base of the middle chamber are welded to the corresponding support rods and the corresponding bottom crossbeams, and the longitudinal comb plates located on the base of the side chambers are installed on the inclined crossbeams.

[0023] A corrugated tube comb plate is welded to each end of the longitudinal beam, and a transverse comb plate is welded between the corrugated tube comb plates. The transverse comb plate is installed on the longitudinal comb plate through the bottom fitting groove.

[0024] S2.1: Set the height of the support rod along the bridge direction according to the longitudinal slope ratio of the bridge, so that the longitudinal beams and longitudinal comb plates welded to them form a slope consistent with the longitudinal slope of the bridge.

[0025] S3: Precisely position the panel of the stay cable anchor block frame, and connect the connecting rod to the support rod of the steel reinforcement frame through the installation crossbar;

[0026] S4: Position the transverse reinforcing bars in the first positioning port of the longitudinal comb plate and position the longitudinal reinforcing bars in the second positioning port of the transverse comb plate. The transverse and longitudinal reinforcing bars are welded together at every other intersection point, and the welded connections are distributed in a quincunx pattern.

[0027] S5: Position and install the prestressed corrugated pipe in the third positioning port between the two corrugated pipe comb plates. Insert a positioning steel pipe with an inner diameter 10~20mm smaller into the inside of the prestressed corrugated pipe, and spot weld both ends of the positioning steel pipe to the inclined crossbeam or the bottom crossbeam of the middle box chamber.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. This invention sets the height of the support rods along the bridge direction according to the longitudinal slope ratio of the bridge, so that the longitudinal beams and longitudinal comb plates welded to them form a slope consistent with the longitudinal slope of the bridge. After the segmental beams are poured, there is no need to adjust the longitudinal slope, which reduces equipment investment and saves construction time.

[0030] 2. In this invention, the reinforcing bars of the cable anchor blocks are processed into a whole in the factory and then installed onto the cable anchor block jig. This reduces the amount of installation work and avoids the problems of conflict between the working surfaces, inconvenience, and low efficiency when the reinforcing bars of the cable anchor blocks and the main beam are constructed simultaneously.

[0031] 3. The present invention inserts a positioning steel pipe into the corrugated pipe to form continuous support for the corrugated pipe, which solves the problem that the corrugated pipe is easily squeezed, bent and deformed during concrete pouring. Attached Figure Description

[0032] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0033] Appendix Figure 1 This is a schematic elevation view of the present invention.

[0034] Appendix Figure 2 This is an appendix to the present invention. Figure 1 Enlarged diagram of point F in the middle.

[0035] Appendix Figure 3 This is an appendix to the present invention. Figure 1 Enlarged diagram of point G in the middle.

[0036] Appendix Figure 4 This is a planar schematic diagram of the present invention.

[0037] Appendix Figure 5 This is an appendix to the present invention. Figure 4 Enlarged diagram of point K in the middle.

[0038] Appendix Figure 6 This is an appendix to the present invention. Figure 4 Enlarged diagram of point L in the middle.

[0039] Appendix Figure 7 This is an appendix to the present invention. Figure 4 Side view diagram of section II-II.

[0040] Appendix Figure 8 This is an appendix to the present invention. Figure 4 Side view of section III-III.

[0041] Appendix Figure 9 This is an appendix to the present invention. Figure 7 Enlarged diagram of point A in the middle.

[0042] Appendix Figure 10 This is a schematic diagram of the inner mold.

[0043] Appendix Figure 11 This is an appendix to the present invention. Figure 4 Schematic diagram of section I-I.

[0044] Appendix Figure 12 This is an appendix to the present invention. Figure 11 Enlarged view of section B in the middle.

[0045] Appendix Figure 13 This is an appendix to the present invention. Figure 4 Schematic diagram of section IV-IV.

[0046] Appendix Figure 14 This is an appendix to the present invention. Figure 13 Enlarged view of point C in the middle.

[0047] Appendix Figure 15 This is an appendix to the present invention. Figure 13 Enlarged view of point M in the middle.

[0048] Appendix Figure 16 This is a schematic diagram of the longitudinal comb plate of the present invention.

[0049] Appendix Figure 17 This is a schematic diagram of the corrugated tube comb plate of the present invention.

[0050] Appendix Figure 18 This is an appendix to the present invention. Figure 17 Enlarged view of point D in the middle.

[0051] Appendix Figure 19 This is a schematic diagram of the transverse comb plate of the present invention.

[0052] Appendix Figure 20 This is an appendix to the present invention. Figure 19 Enlarged view of point E in the middle.

[0053] Appendix Figure 21This is a three-dimensional diagram of the cable anchoring block frame of the present invention.

[0054] Appendix Figure 22 This is a schematic diagram of the steel bar connection types of the present invention.

[0055] Appendix Figure 23 This is a schematic diagram of the bellows positioning of the present invention.

[0056] In the diagram: 1. Reinforcing steel frame; 1.1. Bottom crossbeam; 1.1.1. Bottom crossbeam of the middle chamber; 1.1.2. Bottom crossbeam of the side chamber; 1.2. Support rod; 1.3. Diagonal crossbeam; 1.4. Longitudinal beam; 1.5. Longitudinal comb plate; 1.5.1. First positioning port; 1.6. Transverse comb plate; 1.6.1. Transverse comb plate of the side chamber; 1.6.2. Transverse comb plate of the middle chamber; 1.6.3. Second positioning port; 1.7. Corrugated pipe comb plate; 1.7.1. Third positioning port; 1.8. Positioning steel pipe;

[0057] 2. Base; 2.1. Middle chamber base; 2.2. Side chamber base;

[0058] 3. Cable anchoring block frame; 3.1. Panel; 3.2. Connecting rod; 3.3. Mounting crossbar;

[0059] 4. Internal mold;

[0060] 5. Beam segment reinforcement; 5.1. Longitudinal reinforcement; 5.2. Transverse reinforcement;

[0061] 6. Welding intersections;

[0062] 7. Prestressed corrugated pipe. Detailed Implementation

[0063] The following drawings will disclose several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details are not intended to limit the invention. That is, in some embodiments of the invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0064] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this invention.

[0065] Please see Figures 1-23 The present invention relates to a cable-stayed bridge segmental box girder formwork and construction method, comprising:

[0066] The base 2 includes a central chamber base 2.1 and two side chamber bases 2.2;

[0067] The steel reinforcement frame 1 includes a bottom crossbeam 1.1, a support rod 1.2, a longitudinal comb plate 1.5, and a transverse comb plate 1.6.

[0068] Several bottom crossbeams 1.1 are embedded in the base 2, and several support rods 1.2 are welded in rows onto the bottom crossbeams 1.1. A diagonal crossbeam 1.3 is installed at the top of each row of support rods 1.2 located in the side chamber base 2.2 (see...). Figure 14 );

[0069] The bottom crossbeam 1.1 includes the middle chamber bottom crossbeam 1.1.1 and the side chamber bottom crossbeam 1.1.2. Several longitudinal beams 1.4 are welded to the diagonal crossbeam 1.3 and the middle chamber bottom crossbeam 1.1.1; several longitudinal comb plates 1.5 located on the middle chamber base 2.1 are welded to each row of support rods 1.2 and bottom crossbeams 1.1 (see reference). Figure 8 Several longitudinal comb plates 1.5 located on the base 2.2 of the side chamber are welded to the inclined crossbeam 1.3;

[0070] Several transverse comb plates 1.6 are vertically welded to the longitudinal beam 1.4, and the bottom of the transverse comb plates 1.6 is provided with matching grooves corresponding to the longitudinal comb plates 1.5.

[0071] It also includes a cable anchoring block frame 3, which includes a panel 3.1, a connecting rod 3.2, and a mounting crossbar 3.3. The connecting rod 3.2 is vertically supported on the base 2, and the two ends of the mounting crossbar 3.3 are welded to the lower end of the connecting rod 3.2 and the support rod 1.2 of the steel reinforcement frame 1, respectively.

[0072] The longitudinal comb plate 1.5 and the transverse comb plate 1.6 are respectively provided with a first positioning port 1.5.1 and a second positioning port 1.6.3; a transverse steel bar 5.2 is installed in the first positioning port 1.5.1 of the longitudinal comb plate 1.5, and a longitudinal steel bar 5.1 is installed in the second positioning port 1.6.3 of the transverse comb plate 1.6.

[0073] It also includes two corrugated pipe comb plates 1.7, which are respectively installed at both ends of the steel reinforcement frame 1 along the bridge direction, and the two corrugated pipe comb plates 1.7 are vertically welded to both ends of the longitudinal beam 1.4.

[0074] A third positioning port 1.7.1 is provided on the corrugated tube comb plate 1.7. Prestressed corrugated tubes 7 are installed in the corresponding third positioning ports 1.7.1 on both corrugated tube comb plates 1.7. Positioning steel pipes 1.8 are inserted into the prestressed corrugated tubes 7 to keep them straight and accurately position them.

[0075] Several transverse steel bars 5.2 and several longitudinal steel bars 5.1 are arranged at their intersection points on the same axis, with each intersection point being a welded intersection point 6. The welded intersection points 6 on two adjacent axes are staggered. On the steel mesh formed by the transverse steel bars 5.2 and the longitudinal steel bars 5.1, the welded intersection points 6 are arranged in a quincunx pattern.

[0076] Base 2 is made of cast concrete;

[0077] The upper surface of the bottom crossbeam 1.1 protrudes from the base 2 to facilitate the welding of the support rod 1.2 and the transverse comb plate 1.6. The bottom crossbeam 1.1, support rod 1.2, diagonal crossbeam 1.3, and longitudinal beam 1.4 are made of channel steel.

[0078] Construction method of segmental box girder formwork for cable-stayed bridges:

[0079] S1: Lay the base 2, and during the laying process, embed the bottom crossbeam 1.1 in the steel reinforcement frame 1 into the concrete of the base 2, and then carry out curing;

[0080] S2: After the concrete of the base 2 reaches its strength, the support rods 1.2 are welded in an orderly manner onto the bottom crossbeam 1.1, and the inclined crossbeams 1.3 are welded onto the support rods 1.2 located in the side box chamber;

[0081] Several longitudinal comb plates 1.5 located on the middle chamber base 2.1 are welded to the corresponding support rods 1.2 and the corresponding bottom crossbeams 1.1, and the longitudinal comb plates 1.5 located on the side chamber base 2.2 are installed on the diagonal crossbeams 1.3.

[0082] A corrugated comb plate 1.7 is welded to each end of the longitudinal beam 1.4, and a transverse comb plate 1.6 is welded between the corrugated comb plates 1.7. The transverse comb plate 1.6 is installed on the longitudinal comb plate 1.5 through the mating groove at the bottom.

[0083] S2.1: Set the height of the support rod 1.2 in the longitudinal direction of the bridge according to the longitudinal slope ratio of the bridge, so that the longitudinal beam 1.4 and the longitudinal comb plate 1.5 welded to it form a slope consistent with the longitudinal slope of the bridge;

[0084] S3: Precisely position the panel 3.1 of the cable anchor block frame 3, and connect the connecting rod 3.2 to the support rod 1.2 of the steel reinforcement frame 1 through the installation crossbar 3.3;

[0085] S4: Position the transverse steel bar 5.2 in the first positioning port 1.5.1 of the longitudinal comb plate 1.5, and position the longitudinal steel bar 5.1 in the second positioning port 1.6.3 of the transverse comb plate 1.6. The transverse steel bar 5.2 and the longitudinal steel bar 5.1 are welded together at every other intersection point, and the welded connections are distributed in a quincunx pattern.

[0086] S5: Position and install the prestressed corrugated pipe 7 on the third positioning port 1.7.1 between the two corrugated pipe comb plates 1.7. Insert a positioning steel pipe 1.8 with an inner diameter 10~20mm smaller into the inside of the prestressed corrugated pipe 7. Spot weld the two ends of the positioning steel pipe 1.8 to the inclined crossbeam 1.3 or the bottom crossbeam 1.1.1 of the middle box chamber.

[0087] S6: Insert the inner mold 4 and further lay the beam segment reinforcement 5.

[0088] The above are merely embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A segmental box girder bridge segment jig, characterized in that, It includes: The base (2) includes a middle chamber base (2.1) and two side chamber bases (2.2); The steel reinforcement formwork (1) includes a bottom cross beam (1.1), a support rod (1.2), a longitudinal comb plate (1.5) and a transverse comb plate (1.6); Several bottom cross beams (1.1) are embedded in the base (2), and several support rods (1.2) are integrally welded on the bottom cross beam (1.1), and the support rods (1.2) in the bridge direction are arranged according to the height of the bridge longitudinal slope ratio, and the top of each row of support rods (1.2) located in the side chamber base (2.2) is provided with an inclined cross beam (1.3); The bottom cross beam (1.1) includes a middle chamber bottom cross beam (1.1.1) and a side chamber bottom cross beam (1.1.2), and a plurality of longitudinal beams (1.4) are welded on the inclined cross beam (1.3) and the middle chamber bottom cross beam (1.1.1); A plurality of longitudinal comb plates (1.5) located in the middle chamber base (2.1) are welded with each column of support rods (1.2) and bottom cross beams (1.1); A plurality of longitudinal comb plates (1.5) located in the side chamber base (2.2) are welded on the inclined cross beam (1.3); A plurality of transverse comb plates (1.6) are vertically welded on the longitudinal beam (1.4), and the bottom of the transverse comb plate (1.6) is provided with a matching groove corresponding to the longitudinal comb plate (1.5); The base (2) is poured with concrete; The upper surface of the bottom cross beam (1.1) protrudes from the base (2) to facilitate the welding of the support rod (1.2) and the transverse comb plate (1.6), and the bottom cross beam (1.1), the support rod (1.2), the inclined cross beam (1.3) and the longitudinal beam (1.4) are made of channel steel.

2. The segmental box girder jig for cable-stayed bridge according to claim 1, characterized in that: It also includes a cable anchor block formwork (3), which includes a panel (3.1), a connecting rod (3.2) and a mounting cross bar (3.3), the connecting rod (3.2) is vertically supported on the base (2), and the mounting cross bar (3.3) is welded at both ends with the lower end of the connecting rod (3.2) and the support rod (1.2) of the steel reinforcement formwork (1).

3. The segmental box girder jig for cable-stayed bridge according to claim 1, characterized in that: The longitudinal comb plate (1.5) and the transverse comb plate (1.6) are respectively provided with a first positioning port (1.5.1) and a second positioning port (1.6.3); A transverse steel bar (5.2) is installed in the first positioning port (1.5.1) of the longitudinal comb plate (1.5), and a longitudinal steel bar (5.1) is installed in the second positioning port (1.6.3) of the transverse comb plate (1.6).

4. The segmental box girder jig for cable-stayed bridge according to claim 1, characterized in that: It also includes two corrugated pipe comb plates (1.7), which are respectively installed at the two ends of the steel reinforcement formwork (1) in the bridge direction, and the two corrugated pipe comb plates (1.7) are vertically welded at both ends of the longitudinal beam (1.4).

5. The segmental box girder jig for cable-stayed bridge according to claim 4, characterized in that: The corrugated pipe comb plate (1.7) is provided with a third positioning opening (1.7.1), and the corresponding third positioning openings (1.7.1) of the two corrugated pipe comb plates (1.7) are each provided with a prestressed corrugated pipe (7), and the prestressed corrugated pipe (7) is inserted with a positioning steel pipe (1.8) to keep it straight to accurately position.

6. The segmental box girder jig for cable-stayed bridge according to claim 3, characterized in that: The intersection points of the plurality of transverse steel bars (5.2) and the plurality of longitudinal steel bars (5.1) on the same axis are sequentially arranged as welding intersection points (6) every other one, and the welding intersection points (6) on two adjacent axes are arranged in a staggered manner, and the welding intersection points (6) are arranged in a plum blossom shape on the steel bar mesh formed by the transverse steel bars (5.2) and the longitudinal steel bars (5.1).

7. A cable-stayed bridge segmental box girder jig construction method, comprising a cable-stayed bridge segmental box girder jig according to any one of claims 1-6, characterized in that: S1: laying the base (2), and pre-burying the bottom cross beam (1.1) in the steel reinforcement jig (1) into the concrete of the base (2) during the laying process, and then curing; S2: after the base (2) concrete reaches the strength, sequentially weld the support rods (1.2) on the bottom cross beam (1.1), and weld the inclined cross beams (1.3) on the support rods (1.2) located in the side box chamber; weld a plurality of longitudinal comb plates (1.5) located in the middle box chamber base (2.1) on the corresponding support rods (1.2) and the corresponding bottom cross beams (1.1), and install the longitudinal comb plates (1.5) located in the side box chamber base (2.2) on the inclined cross beams (1.3); weld a corrugated pipe comb plate (1.7) at each end of the longitudinal beam (1.4), and weld a transverse comb plate (1.6) between the corrugated pipe comb plates (1.7), and the transverse comb plate (1.6) is installed on the longitudinal comb plate (1.5) through the bottom fitting groove; S3: accurately positioning the face plate (3.1) of the cable-stayed cable anchorage block jig (3), and connecting the connecting rod (3.2) with the support rod (1.2) of the steel reinforcement jig (1) through the installation cross rod (3.3); S4: positioning and installing the transverse steel bars (5.2) in the first positioning opening (1.5.1) of the longitudinal comb plate (1.5), and positioning and installing the longitudinal steel bars (5.1) in the second positioning opening (1.6.3) of the transverse comb plate (1.6), and every other one at the intersection point is welded, and the welding connection is distributed in a plum blossom shape; S5: positioning and installing the prestressed corrugated pipe (7) in the third positioning opening (1.7.1) between the two corrugated pipe comb plates (1.7), inserting the positioning steel pipe (1.8) with an inner diameter of 10-20mm into the prestressed corrugated pipe (7), and spot welding the two ends of the positioning steel pipe (1.8) on the inclined cross beam (1.3) or the middle box chamber bottom cross beam (1.1.1).

8. The construction method of a cable-stayed bridge segmental box girder jig according to claim 7, characterized in that: S2.1: According to the bridge longitudinal slope ratio, the height of the support rod (1.2) in the bridge direction is set, so that the longitudinal beam (1.4) and the longitudinal comb plate (1.5) welded thereon form a slope consistent with the bridge longitudinal slope.

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