Method for recycling bridge plates of simply supported beam bridges with different skew angles and bridge

Abstract

The present application relates to the technical field of bridge construction, and discloses a method for recycling bridge slabs of simply supported beam bridges with different skew angles and a bridge, comprising the following steps: using bridge slabs with a skew angle of β, implementing the part below the bent cap and abutment of the lower structure of the simply supported beam bridge with a skew angle of α according to a predetermined scheme, wherein the width of the bent cap of the middle pier is determined according to the laying requirements, a triangular block is added at the end of the bridge slab at the abutment, a expansion joint is formed between the end of the bridge slab and the triangular block and the back wall of the abutment after the triangular block is added, the width of the abutment cap is determined according to the laying requirements, and the calculation method of the added value b of the bent cap of the middle pier and the abutment cap is b=(cotβ-cotα) / 2. The method realizes the recycling of bridge slabs with different skew angles without changing the predetermined lower structure of the bridge. The method can significantly save the engineering cost, realize the recycling of the bridge slabs, and reduce the construction waste caused by abandonment, and realizes green environmental protection.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a method for reusing bridge slabs of simply supported beam bridges with different skew angles, and the bridge itself. Background Technology

[0002] In a simply supported beam bridge, the angle β between the perpendicular line to the bridge's centerline and the support line is called the oblique angle. When the oblique angle is not 0, it can be positive or negative, such as... Figure 1-3 As shown; in the construction of simply supported beam bridges, there are often some bridge slabs that have been dismantled and have not been used for a long time. Although their technical indicators such as span, width, and load-bearing capacity are the same as or better than those of the bridge being constructed, they cannot be used because of the different skew angles. Figure 4 As shown, a beam-slab with a skew angle of β cannot be used in a bridge with a skew angle of α. This method addresses the aforementioned problem of how to reuse beams with different skew angles, thereby allowing the bridge deck to continue to function effectively. Summary of the Invention

[0003] The purpose of this invention is to provide a method and a bridge for reusing bridge decks of simply supported beam bridges with different skew angles, and to solve the problem of how to reuse bridge decks that have been demolished and bridges under construction with different skew angles, so as to continue to give full play to the function of bridge decks.

[0004] The present invention is achieved through the following technical solution.

[0005] The present invention discloses a method for reusing bridge slabs of simply supported beam bridges with different skew angles, comprising the following steps: using bridge slabs with a skew angle of β, and implementing the cap beam and abutment cap portion of the substructure of the simply supported beam bridge with a skew angle of α according to a predetermined scheme, wherein the width of the cap beam of the middle pier is determined according to the placement requirements at the pier, and at the abutment, a triangular block is added to the end of the bridge slab. After adding the triangular block, an expansion joint is formed between the end of the bridge slab and the triangular block and the back wall of the abutment. The width of the abutment cap is determined according to the placement requirements. The increase in the width b of the cap beam of the middle pier and the abutment cap is calculated as follows: b = (cotβ - cotα) / 2.

[0006] Furthermore, the expansion joints at the ends of the bridge deck and between the triangular blocks and the abutment back wall are comb-shaped expansion joints.

[0007] Furthermore, the expansion joints between the ends of the bridge deck are comb-shaped expansion joints.

[0008] Furthermore, the added triangular blocks are formed at the ends of the bridge deck.

[0009] Furthermore, the triangular blocks are made of the same material as the bridge deck.

[0010] Furthermore, the triangular blocks are made of cast concrete with reinforcing steel bars.

[0011] Furthermore, the strength grade of the material used for the triangular blocks is higher than that of the bridge deck.

[0012] A bridge, based on the above-mentioned method for reusing bridge slabs of simply supported beam bridges with different skew angles, includes a central pier, an abutment, and a bridge slab, wherein a triangular block is provided between the end of the bridge slab and the back wall of the abutment.

[0013] Furthermore, the triangular block is formed on the end of the bridge deck, and an expansion joint is provided between the bridge deck and the triangular block and the abutment back wall.

[0014] Furthermore, the expansion joint is a comb-shaped expansion joint.

[0015] The beneficial effects of this invention are:

[0016] This method enables the reuse of bridge decks with different skew angles without altering the intended bridge substructure. Only minor costs are incurred due to adding triangular blocks to the ends of the bridge decks, widening the piers, and changing the type of expansion joints. However, these costs are negligible compared to the high cost of bridge decks. Therefore, this method can significantly reduce project costs, achieve bridge deck reuse, and reduce construction waste generated from disposal, thus realizing green environmental protection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 A schematic diagram of a simply supported beam bridge with a positive skew angle;

[0020] Figure 2 A schematic diagram of a simply supported beam bridge with a negative skew angle;

[0021] Figure 3 A schematic diagram of a simply supported beam bridge with a zero skew angle;

[0022] Figure 4 A schematic diagram showing that beams and slabs with an skew angle of β cannot be used in bridges with an skew angle of α;

[0023] Figure 5 A schematic diagram illustrating the reuse of bridge decks using the method described in this invention;

[0024] Figure 6 This is a schematic diagram of the bridge as a whole. Detailed Implementation

[0025] The following is combined Figure 1-6 The present invention will be described in detail below.

[0026] Example 1:

[0027] This invention discloses a method for reusing bridge slabs of simply supported beam bridges with different skew angles, comprising the following steps: using bridge slabs with a skew angle of β, and implementing the cap beams and abutment-beam portion (i.e., piers) of the substructure of the simply supported beam bridge with a skew angle of α according to a predetermined scheme, wherein the width of the cap beam at the middle pier is determined according to the placement requirements, such as... Figure 5 At the abutment, triangular blocks are added to the ends of the bridge slabs. After the addition of the triangular blocks, a straight expansion joint is formed between the ends of the bridge slabs and the triangular blocks and the back wall of the abutment. At the middle pier, the expansion joint between the two ends of the bridge slabs with an oblique angle of β is now used to form an inclined I-shape. The width of the abutment cap is determined according to the bearing requirements. In this application, the general bearing requirements are followed, that is, the ends of the beams and slabs occupy 1 / 2 of the width of the abutment cap. The initial values ​​of the width of the middle pier cap beam and the abutment cap are measured from the original bridge and can be known. The increase in the width of the middle pier and the abutment, b, is calculated as follows: b = (cotβ - cotα) / 2.

[0028] Optionally, the triangular block can also be formed on the back wall of the bridge abutment, and an expansion joint can be set between the end of the bridge deck and the triangular block and the back wall of the bridge abutment.

[0029] At the end of the beam, the two support points of each bridge deck remain at the original support points of the beam, so that the load-bearing capacity of the bridge deck is not affected.

[0030] Expansion joints between bridge deck ends affect a large area, so comb-shaped expansion joints should be used; expansion joints between bridge deck ends and abutments should also be comb-shaped.

[0031] The added triangular blocks are formed at the ends of the bridge deck. The triangular blocks are made of the same material as the bridge deck, concrete, with steel reinforcement according to the structural design. The strength grade of the material used for the triangular blocks is higher than that of the bridge deck. This is because the triangular blocks are added later. If they were of the same strength grade, they would not be part of the same structure as the bridge deck, and since the triangular blocks are load-bearing nodes, their strength would be greatly reduced. A higher strength grade ensures better load-bearing capacity.

[0032] Specifically, this method has been successfully applied in practice, saving construction costs, such as... Figure 6The span is 18m, the width of a single slab beam is B = 1000mm, the width at the two supports is b = 800mm, the skew angle α is 105 degrees, and the skew angle β of the existing bridge slab is 60 degrees. According to the calculation formula, the widening value on each side of the pier and abutment is b = (cotβ - cotα) / 2 = 677mm. The abutment back wall is shifted 677mm away from the river channel. At the beam end support points, the positions of the two support points of each bridge slab remain the original support points of this beam, so the load-bearing capacity of the beam is not affected.

[0033] A bridge, based on the above-mentioned method for reusing bridge slabs of simply supported beam bridges with different skew angles, includes a central pier, an abutment, and a bridge slab. The bridge slab with a skew angle of β is used. The cap beam and the part below the abutment cap of the substructure of the simply supported beam bridge with a skew angle of α are implemented according to a predetermined scheme. The width increase value b of the central pier and the abutment is calculated as: b = (cotβ - cotα) / 2. A triangular block is provided between the end of the bridge slab and the back wall of the abutment.

[0034] The triangular block is formed on the end of the bridge deck. An expansion joint is provided between the bridge deck and the triangular block and the abutment back wall. An expansion joint is provided between the ends of the bridge decks. All expansion joints are comb-shaped expansion joints.

[0035] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for reusing bridge slabs of simply supported beam bridges with different skew angles, characterized in that: The process includes the following steps: Using a bridge slab with an skew angle of β, the substructure of a simply supported beam bridge with an skew angle of α, including the cap beam and abutment cap, is implemented according to the established plan. At the pier, the width of the pier cap beam is determined according to the placement requirements. At the abutment, triangular blocks are added to the ends of the bridge slab. After adding the triangular blocks, an expansion joint is formed between the ends of the bridge slab and the triangular blocks and the abutment back wall. The width of the abutment cap is determined according to the placement requirements. The increase in width b for the pier cap beam and abutment cap is calculated as: b = (cotβ - cotα) / 2.

2. The method for reusing bridge decks of simply supported beam bridges with different skew angles according to claim 1, characterized in that: The expansion joints at the ends of the bridge deck and between the triangular blocks and the abutment back wall are comb-shaped expansion joints.

3. A method for reusing bridge decks of simply supported beam bridges with different skew angles according to claim 1 or 2, characterized in that: The expansion joints between the ends of the bridge deck are comb-shaped expansion joints.

4. The method for reusing bridge slabs of simply supported beam bridges with different skew angles according to claim 3, characterized in that: The added triangular blocks are formed at the ends of the bridge deck.

5. A method for reusing bridge slabs of simply supported beam bridges with different skew angles according to claim 4, characterized in that: The triangular blocks are made of the same material as the bridge deck.

6. A method for reusing bridge slabs of simply supported beam bridges with different skew angles according to claim 5, characterized in that: The triangular blocks are made of cast concrete and reinforced with steel bars.

7. A method for reusing bridge slabs of simply supported beam bridges with different skew angles according to claim 6, characterized in that: The strength grade of the material used for the triangular blocks is higher than that of the bridge deck.

8. A bridge, based on the method for reusing bridge slabs of simply supported beam bridges with different skew angles as described in any one of claims 1-7, characterized in that: It includes a central pier, an abutment, and a bridge deck, with a triangular block provided between the end of the bridge deck and the back wall of the abutment.

9. A method for reusing bridge slabs of simply supported beam bridges with different skew angles according to claim 8, characterized in that: The triangular block is formed on the end of the bridge deck, and an expansion joint is provided between the bridge deck and the triangular block and the abutment back wall.

10. A method for reusing bridge slabs of simply supported beam bridges with different skew angles according to claim 9, characterized in that: The expansion joint is a comb-shaped expansion joint.

Images