CN111809506A - A variable-section ultra-high-performance concrete guide plate structure and its construction method - Google Patents

Abstract

The invention provides a variable-section ultra-high-performance concrete lead-in plate structure and a construction method thereof, comprising a bridge abutment and a lead-in plate located at the rear side of the bridge abutment and connected with the wet joint of the bridge abutment. The bottom of the board has an under-board fill layer that supports the guide board, the top of the guide board is covered with a board fill layer, and the middle of the guide board has a variable section section with a reduced cross-section, so that the guide board is formed with a small section in the middle and a large section at both ends. Dumbbell-shaped, the present invention removes the construction joint by pouring the factory prefabricated ultra-high performance concrete lead plate and the bridge abutment, and can form a plastic hinge by setting a dumbbell-shaped variable section area in the middle of the lead plate, so that the lead plate has a certain rotation ability. The high tensile and compressive strength characteristics of ultra-high performance concrete ensure that the guide plate has sufficient longitudinal stiffness to transmit longitudinal displacement and excellent permeability resistance, and allows tiny cracks to appear in the variable cross-section area of the guide plate, without affecting the durability of the guide plate. Since the turning occurs below the road surface, the risk of cracks in the road surface is greatly reduced.

Description

A variable-section ultra-high-performance concrete guide plate structure and its construction method

technical field

The invention relates to a new structure of a variable-section ultra-high-performance concrete lead plate and a construction method thereof.

Background technique

Existing bridge abutments are provided with telescopic devices behind them. Due to the disease of the telescopic devices, problems such as jumping at the bridge head, corrosion of the substructure, and high maintenance costs will be caused. In addition, the existing seamless bridge approach plate not only needs to bear the vertical vehicle load, but also needs to absorb and transmit the longitudinal deformation of the main beam under the temperature of the seamless bridge. A large number of engineering practices have shown that due to the settlement of the lead plate after construction and the longitudinal displacement of the lead plate, the lead plate is easy to rotate, and cracks are formed in the construction joint between the seamless bridge and the lead plate, and will further reflect to the road surface to form pavement cracks , thus affecting the normal use performance of the seamless bridge.

SUMMARY OF THE INVENTION

The present invention improves the above problems, that is, the technical problem to be solved by the present invention is that the existing bridge abutment is provided with a telescopic device, and the disease of the telescopic device will bring problems such as bridge head jumping, corrosion of the lower structure and high maintenance cost.

The specific embodiment of the present invention is: a variable-section ultra-high-performance concrete lead-in structure, comprising a bridge abutment and a lead plate located at the rear side of the bridge abutment and connected to the bridge abutment wet joint, the front side of the lead plate is placed behind the bridge abutment There is a fill layer under the board supporting the guide board on the side and below the guide board, and the top of the guide board is covered with a fill layer on the board. Dumbbell-shaped with large cross-sections at both ends.

Further, the guide plate extends obliquely downward from one side of the abutment to the other side.

Further, the front side of the guide plate and the upper part of the front side of the bridge abutment are flush, and the upper surfaces of the guide plate, the bridge abutment and the fill layer on the board are paved with pavement.

Further, the variable section section of the lead plate transitions to the slope surfaces at both ends.

Further, the lead plate is prefabricated with ultra-high performance concrete.

The present invention also includes a method for constructing a variable-section ultra-high-performance concrete guide plate structure, which is carried out according to the following steps:

(1) The prefabricated ultra-high-performance concrete guide plate, chisel the surface of the bridge abutment, and compact the under-slab fill on the side of the bridge abutment to support the guide plate to a shape suitable for the shape and structure of the guide plate to form the under-slab fill Floor;

(2) Lift the lead plate, and use wet joints to form the lead plate and the bridge abutment as a whole;

(3) Fill soil above the lead plate to form a soil fill layer on the plate;

(4) Pavement shall be laid on the upper surface of the lead plate, abutment and the fill layer on the plate.

Compared with the prior art, the present invention has the following beneficial effects: the present invention prefabricates a variable-section ultra-high-performance concrete lead plate in a factory, transports it to the site, and hoists it in place. The front end of the lead plate and the bridge abutment are formed as a whole through the wet joint, which restrains the lead plate from rotating and avoids setting construction joints. The section in the middle of the lead plate is reduced to form a dumbbell-shaped variable section area. When the lead plate needs to rotate, the variable cross-section area may form a plastic hinge, so that the lead plate has a certain ability to rotate. The high tensile and compressive strength characteristics of ultra-high performance concrete ensure that the guide plate has sufficient longitudinal stiffness to transmit longitudinal displacement. Durability. Since the rotation occurs at a certain depth below the road surface, the risk of cracks in the road surface is greatly reduced.

Description of drawings

Fig. 1 is a schematic diagram of the cross-sectional structure steps of the new structure of the variable-section ultra-high-performance concrete guide plate;

Fig. 2 is a schematic diagram 2 of the cross-sectional structure steps of the new structure of the variable-section ultra-high-performance concrete guide plate;

Fig. 3 Schematic diagram three of the cross-sectional structure steps of the new structure of the variable-section ultra-high-performance concrete guide plate;

Figure 4 Schematic diagram of the cross-sectional structure of the new structure of the variable-section ultra-high-performance concrete guide plate.

In the figure, 1- lead plate, 2- variable section area, 3- bridge abutment, 4- fill layer under plate, 5- wet joint, 6- fill layer on plate, 7- road surface.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1 to 4, a variable-section ultra-high performance concrete lead plate structure includes a bridge abutment and a lead plate 1 located on the rear side of the bridge abutment 3 and connected to the bridge abutment wet joint 5, and the front side of the lead plate overlaps On the back side of the bridge abutment and below the lead plate, there is an under-board fill layer 4 supporting the lead plate, and the top of the lead plate is covered with an on-board fill layer 6. The lead plate forms a dumbbell-shaped structure with a small cross-section at the middle and a large cross-section at both ends, and the variable-section sections of the lead plate transition to the slope surfaces at both ends.

In this embodiment, the lead plate is prefabricated by ultra-high performance concrete, and the lead plate extends obliquely downward from one side of the abutment to the other side.

The front side of the guide plate and the upper part of the front side of the bridge abutment are flush, and the upper surface of the guide plate, the bridge abutment and the fill layer on the board is paved with pavement.

The factory prefabricated ultra-high performance concrete lead plate and the bridge abutment are poured to cancel the construction joint, and the lead plate is formed into a dumbbell-shaped structure through the variable section area set in the middle of the lead plate. The variable cross-section area may form a plastic hinge, so that the lead plate has certain turning ability. The high tensile and compressive strength characteristics of ultra-high performance concrete ensure that the guide plate has sufficient longitudinal stiffness to transmit longitudinal displacement. Durability. Since the guide plate extends obliquely downward from one side of the abutment to the other and rotates at a certain depth below the road surface, the risk of cracks in the road surface is greatly reduced.

The present invention also includes a method for constructing a variable-section ultra-high-performance concrete guide plate structure, which is carried out according to the following steps:

(1) The prefabricated ultra-high-performance concrete lead plate, chisel the surface of the bridge abutment 3, and compact the under-slab soil on the side of the bridge abutment used to support the lead plate to a shape suitable for the shape and structure of the lead plate to form the under-slab fill Soil layer, construction schematic diagram is shown in Figure 1;

(2) Lift the lead plate, and use the wet joint to form the lead plate and the bridge abutment as a whole. The construction schematic diagram is shown in Figure 2;

(3) Fill soil above the lead plate to form a soil fill layer on the plate. The schematic diagram of the construction is shown in Figure 3;

(4) Pavement shall be laid on the upper surface of the lead plate, the bridge abutment and the fill layer on the plate. The construction schematic diagram is shown in Figure 4.

Unless otherwise stated in any of the technical solutions disclosed in the present invention, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred numerical range is only Among the many implementable numerical values, the technical effect is relatively obvious or representative. Since the numerical values are too numerous to be exhaustive, only some numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values shall not constitute a limitation on the protection scope of the present invention.

If the invention discloses or involves parts or structural parts that are fixedly connected to each other, then, unless otherwise stated, fixed connection can be understood as: detachable fixed connection (for example, using bolts or screws), can also be understood as: non- Detachable fixed connections (such as riveting, welding), and of course, mutual fixed connections can also be replaced by a one-piece structure (for example, integrally formed using a casting process) (except that it is obviously impossible to use a one-piece forming process).

In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in the present disclosure used to represent positional relationships or shapes include states or shapes that are similar to, similar to, or close to.

Any component provided by the present invention may be assembled from a plurality of individual components, or may be a single component manufactured by an integral molding process.

Finally it should be noted that: the above embodiment is only used to illustrate the technical scheme of the present invention and not to limit it; Although the present invention has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should understand: The specific embodiment of the invention is modified or some technical features are equivalently replaced; without departing from the spirit of the technical solution of the present invention, all of them should be included in the scope of the technical solution claimed in the present invention.

Claims (6)

1. a variable-section ultra-high performance concrete lead plate structure, is characterized in that, comprises bridge abutment and the lead plate that is positioned at the bridge abutment rear side and is connected with the bridge platform wet seam, the front side of the lead plate is placed on the bridge abutment rear side and The bottom of the lead plate is provided with a soil layer under the plate that supports the lead plate, the upper part of the lead plate is covered with a soil layer on the plate, and the middle part of the lead plate has a variable section section with a reduced section, so that the lead plate forms the small ends of the middle section. Dumbbell shape with large cross section. 2 . The variable-section ultra-high-performance concrete lead plate structure according to claim 1 , wherein the lead plate extends obliquely downward from one side of the bridge abutment to the other side. 3 . 3. A kind of variable-section ultra-high performance concrete lead plate structure according to claim 1, characterized in that, the front side of the lead plate and the upper part of the front side of the bridge abutment are flush, and the lead plate, the bridge abutment and the fill layer on the board are flush. The upper surface is paved with pavement. 4 . The variable-section ultra-high-performance concrete lead plate structure according to claim 1 , wherein the variable-section section of the lead plate transitions to the slope surfaces at both ends. 5 . 5 . The variable-section ultra-high-performance concrete lead plate structure according to claim 1 , wherein the lead plate is prefabricated by ultra-high-performance concrete. 6 . 6. A variable-section ultra-high performance concrete lead plate structure construction method, characterized in that, carry out according to the following steps: (1) The prefabricated ultra-high-performance concrete guide plate, chisel the surface of the bridge abutment, and compact the under-slab fill on the side of the bridge abutment to support the guide plate to a shape suitable for the shape and structure of the guide plate to form the under-slab fill Floor; (2) Lift the lead plate, and use wet joints to form the lead plate and the bridge abutment as a whole; (3) Fill soil above the lead plate to form a soil fill layer on the plate; (4) Pavement shall be laid on the upper surface of the lead plate, abutment and the fill layer on the plate.

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