Steel-wood combined formwork of cable-stayed bridge cable bent tower and method for forming cable-stayed bridge cable bent tower section

Abstract

The invention discloses a steel-wood combined formwork of a cable-stayed bridge cable tower and a method for forming cable-stayed bridge cable tower sections. A steel-wood combined formwork of a cable-stayed bridge cable tower comprises a plurality of plane formworks made of steel and a plurality of corner formworks made of wood, and when the steel-wood combined formwork is used, the plane formworks and the corner formworks define a circle to form a pouring forming cavity of the cable-stayed bridge cable tower. Receding holes of circumferential prestressed tendons of the cable-stayed bridge cable tower are formed in the corner formwork. Through introduction of the wooden corner formwork, when the corner formwork is used, the receding holes of the circumferential prestressing tendons are formed in the corner formwork, drilling is more convenient and easy to operate, very good applicability is achieved for the tensioning and anchoring positions of the circumferential prestressing tendons in the cable bent tower sections, the construction efficiency can be effectively improved, the project progress can be effectively accelerated, and the construction cost can be effectively reduced; and inconvenience and resource waste in the construction process are reduced.

Description

Technical Field

[0001] The invention relates to the field of cable-stayed bridge construction, and in particular to a steel-wood combined formwork for a cable-stayed bridge tower and a method for forming a cable-stayed bridge tower segment. Background Art

[0002] The cable tower is the core load-bearing and structural element of the cable-stayed bridge. It not only bears its own weight, but also needs to resist the vertical and horizontal loads of the bridge deck through the cable-stayed system. With the development of cable-stayed bridge construction technology, the structural form of the cable tower continues to innovate to meet more complex mechanical requirements.

[0003] At present, when using the vertical formwork casting technology to construct cable towers, it is often encountered that the cable tower is cast in sections with non-uniform cross-sections, and some cable tower segments also need to be penetrated with circumferential prestressed tendons to further strengthen the concrete stress of the cable tower segment. The hole positions of these circumferential prestressed tendons are not consistent in each cable tower segment, that is, the opening positions of the circumferential prestressed tendons in each cable tower segment are not exactly the same. These unique structural characteristics undoubtedly put forward extremely high requirements and challenges for the design, selection and construction of the cable tower formwork (the formwork needs to have holes for the circumferential prestressed tendons to pass through). Summary of the invention

[0004] The main purpose of the present invention is to provide a steel-wood composite formwork for a cable-stayed bridge cable tower having good applicability to the tensioning and anchoring positions of annular prestressed tendons in cable tower segments and a method for forming cable-stayed bridge cable tower segments.

[0005] To achieve the above-mentioned purpose, the present invention provides a steel-wood composite formwork for a cable-stayed bridge tower, comprising a plurality of plane formworks made of steel and a plurality of corner formworks made of wood. When in use, the plurality of plane formworks and the plurality of corner formworks are enclosed in a circle to form a casting molding cavity for the cable-stayed bridge tower, and the make-away holes for the annular prestressed tendons of the cable-stayed bridge tower are opened on the corner formworks.

[0006] Furthermore, the corner template is composed of two wooden boards connected at right angles.

[0007] Furthermore, one or more reinforcing columns made of steel are connected between the inner surfaces of the two wooden boards.

[0008] Furthermore, the reinforcing columns are connected to the two wooden boards using the following structure: the inner surfaces of the two wooden boards are respectively connected with one or more connecting wooden strips, and the reinforcing columns are respectively connected to at least one of the connecting wooden strips on the two wooden boards.

[0009] Furthermore, the reinforcing column includes a first I-beam column and a second I-beam column perpendicular to each other, the cross-section of the connecting wood strip is I-shaped, and the first I-beam column and the second I-beam column are respectively connected to the corresponding connecting wood strip through snap fasteners.

[0010] Furthermore, the fastener includes a U-shaped support plate, a support rod, a bolt, a nut, two first hooks and two second hooks, the support rod is movably clamped in the U-shaped support plate, the two first hooks are respectively fixed at both ends of the support rod, and the two second hooks are fixed to the outer surface of the U-shaped support plate, the bolt is passed through the support rod and the U-shaped support plate and cooperates with the nut, and the two first hooks and the two second hooks are respectively used to hook on the sides of the first I-beam column, the second I-beam column or the connecting wooden strip.

[0011] Furthermore, supporting wooden strips are fixed to the inner surfaces of both ends of the two wooden boards, and both ends of the connecting wooden strips are connected to the corresponding supporting wooden strips.

[0012] Furthermore, a reinforcing wooden pole is connected between the supporting wooden strips at the same end.

[0013] The present invention also provides a method for forming a cable-stayed bridge tower segment by using the steel-wood combined formwork of the cable-stayed bridge tower, comprising the following steps:

[0014] (1) Steel bars for tying tower segments and corrugated pipes for installing annular prestressed tendons;

[0015] (2) Assembling steel-wood composite formwork for cable-stayed bridge towers;

[0016] (3) Drill clearance holes on the corner formwork of the steel-wood composite formwork of the cable-stayed bridge tower, and the position of the clearance holes corresponds to the position of the corrugated pipe;

[0017] (4) Pass the annular prestressed tendons through the clearance holes and the corrugated pipe and fix them;

[0018] (5) Pouring concrete in the steel-wood composite formwork of the cable-stayed bridge tower;

[0019] (6) After the concrete is cured and formed, the steel-wood composite formwork of the cable-stayed bridge tower is removed.

[0020] The beneficial effects of the present invention are embodied in:

[0021] The present invention introduces a wooden corner formwork. When in use, the giving way holes for the annular prestressed tendons are opened on the corner formwork, which makes drilling more convenient and easy to operate. It has very good applicability to the tensioning and anchoring positions of the annular prestressed tendons in the tower segments, can effectively improve construction efficiency, accelerate project progress, reduce construction costs, and reduce inconvenience and waste of resources during the construction process.

[0022] The present invention forms a combined formwork through a plane formwork and a corner formwork, which can effectively adapt to the segmented construction of non-uniform cross-section cable towers of cable-stayed bridges and maintain structural stability. It solves the problem of high consumption of steel formworks and difficulty in reuse in the prior art, and at the same time greatly alleviates the complexity and inconvenience of punching holes in the annular prestressed tendons of the cable towers, thereby significantly improving the convenience of cable tower construction.

[0023] The invention has the advantages of simple structure, economical convenience and high safety, and has broad application prospects in the construction of cable towers with non-uniform cross-sections of cable-stayed bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram showing the use status of a steel-wood composite formwork for a cable-stayed bridge tower according to an embodiment of the present invention;

[0025] Figure 2 It is a schematic structural diagram of a corner formwork in a steel-wood composite formwork of a cable-stayed bridge tower according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of connecting wooden strips in a steel-wood composite formwork of a cable-stayed bridge tower according to an embodiment of the present invention;

[0027] Figure 4 The present invention is a schematic structural diagram of a clip in a steel-wood composite formwork for a cable-stayed bridge tower according to an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1. Plane template;

[0030] 2. Corner formwork; 21. Wooden board; 22. Connecting wooden strips; 23. Supporting wooden strips; 24. Strengthening wooden poles;

[0031] 3. Strengthen the columns; 31. The first I-beam column; 32. The second I-beam column;

[0032] 4. snap fastener; 41. U-shaped support plate; 42. support rod; 43. bolt; 44. first hook; 45. second hook;

[0033] 5. Bellows. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist.

[0037] See also Figures 1 to 4 .

[0038] The steel-wood composite formwork of the cable-stayed bridge tower of the present invention comprises a plurality of plane formworks 1 made of steel and a plurality of corner formworks 2 made of wood. When in use, the plurality of plane formworks 1 and the plurality of corner formworks 2 are enclosed in a circle to form a casting molding cavity of the cable-stayed bridge tower, and the make-away holes of the annular prestressed tendons of the cable-stayed bridge tower are opened on the corner formworks 2.

[0039] The present invention introduces a wooden corner formwork. When in use, the giveway holes for the annular prestressed tendons are opened on the corner formwork, which makes drilling more convenient and easy to operate. It has very good applicability to the tensioning and anchoring positions of the annular prestressed tendons in the tower segments, can effectively improve construction efficiency, and accelerate project progress.

[0040] The present invention forms a combined formwork through a plane formwork and a corner formwork, which can effectively adapt to the segmented construction of non-uniform cross-section cable towers of cable-stayed bridges and maintain structural stability. It solves the problem of high consumption of steel formworks and difficulty in reuse in the prior art, and at the same time greatly alleviates the complexity and inconvenience of punching holes in the annular prestressed tendons of the cable towers, thereby significantly improving the convenience of cable tower construction.

[0041] In one embodiment, the corner template 2 is composed of two wooden boards 21 connected at a right angle.

[0042] In one embodiment, one or more reinforcement columns 3 made of steel are connected between the inner surfaces of the two wooden boards 21. With this design, the reinforcement columns are used to prevent the template from being overstressed during concrete pouring, thereby improving the stability of the structure.

[0043] In one embodiment, the reinforcing columns 3 are connected to the two wooden boards 21 using the following structure: the inner surfaces of the two wooden boards 21 are respectively connected with one or more connecting wood strips 22, and the reinforcing columns 3 are respectively connected to at least one of the connecting wood strips 22 on the two wooden boards 21. With this design, the wooden boards are not easily damaged and the reinforcing columns are easy to install.

[0044] In one embodiment, the reinforcing column 3 includes a first I-beam column 31 and a second I-beam column 32 that are perpendicular to each other, the cross-section of the connecting wooden strip 22 is I-shaped, and the first I-beam column 31 and the second I-beam column 32 are respectively connected to the corresponding connecting wooden strip 22 through a snap fastener 4.

[0045] As shown in the figure, two connecting wood strips 22 extending along the length direction of the two wooden boards 21 are respectively provided. The lower ends of the two I-shaped steel columns 32 are clamped between the corresponding two connecting wood strips 22.

[0046] In one embodiment, the fastener 4 includes a U-shaped support plate 41, a support rod 42, a bolt 43, a nut, two first hooks 44 and two second hooks 45. The support rod 42 is movably clamped in the U-shaped support plate 41, the two first hooks 44 are respectively fixed at both ends of the support rod 42, and the two second hooks 45 are fixed on the outer surface of the U-shaped support plate 41. The bolt 43 is passed through the support rod 42 and the U-shaped support plate 41 and cooperates with the nut. The two first hooks 44 and the two second hooks 45 are respectively used to hook on the sides of the first I-beam column 31, the second I-beam column 32 or the connecting wooden strip 22. The snap-fitting parts of this design are connected by hooking the side edges of the two parts to be connected respectively with the first hook and the second hook, and locking and disassembly are achieved by nuts. The first I-beam column and the connecting wooden strips on one of the wooden boards are perpendicular, and the second I-beam column and the connecting wooden strips on the other wooden board are perpendicular. The first hook and the two second hooks are perpendicular to each other, and are just suitable for hooking the side edges of the first I-beam column, the second I-beam column and the corresponding connecting wooden strips respectively.

[0047] In one embodiment, support strips 23 are fixed to the inner surfaces of both ends of the two wooden boards 21, and both ends of the connecting strips 22 are connected to the corresponding support strips 23. The support strips fix the connecting strips and the corner template to prevent the connecting strips from deviating to both sides.

[0048] In one embodiment, a reinforcing wood bar 24 is connected between the supporting wood bars 23 at the same end. The reinforcing wood bar 24 serves to improve the structural strength and stability.

[0049] The method for forming a cable-stayed bridge tower segment by using the steel-wood combined formwork of the cable-stayed bridge tower comprises the following steps:

[0050] (1) Tie the steel bars of the tower segments and tie the corrugated pipe 5 for installing the annular prestressed tendons according to the designed position;

[0051] (2) Assembling steel-wood composite formwork for cable-stayed bridge towers, such as Figure 1 As shown;

[0052] (3) Drill clearance holes on the corner formwork of the steel-wood composite formwork of the cable-stayed bridge tower, and the position of the clearance holes corresponds to the position of the corrugated pipe;

[0053] (4) Pass the annular prestressed tendons through the clearance holes and the corrugated pipe and fix them; at the same time, make a good seal between the clearance holes of the corner template and the corrugated pipe 5;

[0054] (5) Pouring concrete in the steel-wood composite formwork of the cable-stayed bridge tower;

[0055] (6) After the concrete has been cured and formed to the designed strength, the steel-wood composite formwork of the cable-stayed bridge tower is removed.

[0056] The various connections or fixations mentioned in the present invention can be achieved by integral molding, welding, or connection with tightening parts such as bolts according to the material, and the present invention does not impose any special limitation.

[0057] After casting and forming, the annular prestressed tendons can be tensioned and anchored, and the corrugated pipe holes can be sealed by pouring cement slurry; the structural steel bars of the tower segments can then be connected, molded and cast at the corners.

[0058] In addition, the opening position of the corner template can be repaired, and the size of the corner template can be cut and trimmed according to the size of the next cable tower segment. The trimmed corner template is combined with the plane template and used as the outer template of the next cable tower segment. If the corner template is too damaged and cannot be repaired or trimmed, a new corner template is used for the construction of the subsequent cable tower segment.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel-wood composite formwork for a cable-stayed bridge tower, characterized in that: It comprises a plurality of plane formworks made of steel and a plurality of corner formworks made of wood. When in use, the plurality of plane formworks and the plurality of corner formworks are enclosed in a circle to form a casting molding cavity for a cable-stayed bridge tower, and the give-way holes for the annular prestressed tendons of the cable-stayed bridge tower are arranged on the corner formworks.

2. The steel-wood composite formwork for the cable-stayed bridge tower according to claim 1, characterized in that: The corner template is composed of two wooden boards connected at right angles.

3. The steel-wood composite formwork for the cable-stayed bridge tower according to claim 2, characterized in that: One or more reinforcement columns made of steel are connected between the inner surfaces of the two wooden boards.

4. The steel-wood composite formwork for the cable-stayed bridge tower according to claim 3, characterized in that: The reinforcing columns are connected to the two wooden boards using the following structure: the inner surfaces of the two wooden boards are respectively connected with one or more connecting wooden strips, and the reinforcing columns are respectively connected to at least one connecting wooden strip on the two wooden boards.

5. The steel-wood composite formwork for the cable-stayed bridge tower according to claim 4, characterized in that: The reinforcing column comprises a first I-beam column and a second I-beam column perpendicular to each other, the cross section of the connecting wood strip is I-shaped, and the first I-beam column and the second I-beam column are respectively connected to the corresponding connecting wood strip through snap fasteners.

6. The steel-wood composite formwork for the cable-stayed bridge tower according to claim 5, characterized in that: The fastener includes a U-shaped support plate, a support rod, a bolt, a nut, two first hooks and two second hooks. The support rod is movably clamped in the U-shaped support plate, the two first hooks are respectively fixed at both ends of the support rod, and the two second hooks are fixed to the outer surface of the U-shaped support plate. The bolt passes through the support rod and the U-shaped support plate and cooperates with the nut. The two first hooks and the two second hooks are respectively used to hook on the sides of the first I-beam column, the second I-beam column or the connecting wooden strip.

7. The steel-wood composite formwork for a cable-stayed bridge tower as claimed in claim 4, 5 or 6, characterized in that: Supporting wooden strips are respectively fixed to the inner surfaces of both ends of the two wooden boards, and both ends of the connecting wooden strips are respectively connected to the corresponding supporting wooden strips.

8. The steel-wood composite formwork for the cable-stayed bridge tower according to claim 7, characterized in that: A reinforcing wooden rod is connected between the supporting wooden strips at the same end.

9. A method for forming a cable-stayed bridge tower segment using the steel-wood composite formwork of a cable-stayed bridge tower according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Steel bars for tying tower segments and corrugated pipes for installing annular prestressed tendons; (2) Assembling steel-wood composite formwork for cable-stayed bridge towers; (3) Drill clearance holes on the corner formwork of the steel-wood composite formwork of the cable-stayed bridge tower, and the position of the clearance holes corresponds to the position of the corrugated pipe; (4) Pass the annular prestressed tendons through the clearance holes and the corrugated pipe and fix them; (5) Pouring concrete in the steel-wood composite formwork of the cable-stayed bridge tower; (6) After the concrete is cured and formed, the steel-wood composite formwork of the cable-stayed bridge tower is removed.

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