A structure for connecting an existing river-crossing bridge with a newly-built dike and a construction method thereof

Abstract

The application is a kind of connecting structure of existing river-crossing bridge and newly-built dike and its construction method, which comprises an existing road, a connecting structure section and an existing river-crossing bridge; the connecting structure section comprises a sand-gravel roadbed layer, a graded broken stone base layer laid on the sand-gravel roadbed layer and a cement concrete pavement layer cast on the graded broken stone base layer; the cement concrete pavement layer is composed of a rising slope section, a straight section and a descending slope section, the rising slope section is connected with the existing river-crossing bridge at its starting point and the descending slope section is connected with the existing road at its ending point; retaining walls are arranged on both sides of the connecting structure section. Compared with the prior art, the application avoids removing and rebuilding the existing river-crossing bridge for water blocking, reduces the engineering investment, saves the investment by using the sand-gravel material excavated from the river for filling the roadbed layer, has simple structure, is convenient for construction, is easy to obtain materials and has low cost, and meets the road traffic requirements.

Description

Technical Field

[0001] This invention relates to the field of dike engineering technology, specifically to a connection structure between an existing cross-river bridge and a newly constructed dike, and its construction method. Background Technology

[0002] In northern my country, existing bridges crossing rivers are frequently encountered during comprehensive river management projects. These existing bridges are often low-lying bridges with inadequate flood control standards, failing to meet planned flood control requirements and obstructing water flow. If all these low-lying bridges were demolished and rebuilt as all-weather bridges according to design flood levels and clearance requirements, many low-grade highways would face significant funding gaps, making construction impossible. Furthermore, given the relatively small traffic volume of low-grade highways, replacing all low-lying bridges with all-weather bridges would be an impractical and wasteful investment. Therefore, resolving the connection between existing bridges and newly constructed dikes during river management is a crucial issue that needs to be addressed.

[0003] In view of this, the present invention is hereby proposed. Summary of the Invention

[0004] One of the objectives of this invention is to provide a connection structure between an existing cross-river bridge and a newly constructed embankment, so as to solve the problems mentioned in the background art.

[0005] To achieve one of the above objectives, the present invention provides the following technical solution:

[0006] A connection structure between an existing cross-river bridge and a newly constructed embankment includes an existing road, a connection structure section, and the existing cross-river bridge;

[0007] The connecting structure section includes a gravel road base, a graded crushed stone base is laid on the gravel road base, and a cement concrete pavement layer is poured on the graded crushed stone base.

[0008] The cement concrete pavement layer consists of a sloping section, a straight section, and a descending section. The starting point of the sloping section is connected to the existing cross-river bridge, and the ending point of the descending section is connected to the existing road.

[0009] Retaining walls are also installed on both sides of the connecting structure section.

[0010] Preferably, the starting point of the slope section is located at the intersection of the existing cross-river bridge and the inner slope of the newly built embankment.

[0011] Preferably, the gravel road base is constructed using riverbed excavated gravel, with a compaction degree of not less than 90%.

[0012] Preferably, the elevation of the straight section is level with the top elevation of the newly built dike, and the length of the straight section is not less than the top width of the newly built dike.

[0013] Preferably, the retaining wall is a dry-stone gravity retaining wall.

[0014] Preferably, the top width of the retaining wall is not less than 50 cm, the strength of the block stone used for the retaining wall is not less than MU40, and the strength of the mortar is not less than M10.

[0015] Preferably, a concave vertical curve transition section is arranged between the existing river-crossing bridge and the existing road.

[0016] Preferably, a convex vertical curve transition section is arranged between the existing river-crossing bridge and the existing road.

[0017] Preferably, the thickness of the graded broken stone base is not less than 10 cm, and the compaction degree is not less than 96%.

[0018] The second object of the present application is to provide a construction method of a connection structure of an existing river-crossing bridge and a newly-built embankment to solve the problems in the background art.

[0019] To achieve the second object, the present application provides the following technical solution.

[0020] A construction method of a connection structure of an existing river-crossing bridge and a newly-built embankment, comprising the following steps:

[0021] Step 1: determining the longitudinal slope of the rising section and the descending section, and the radius and length of the convex vertical curve and the concave vertical curve according to the design speed of the existing river-crossing bridge;

[0022] Step 2: positioning the location of the rising point in the rising section, and measuring and setting out according to the design parameters determined in Step 1;

[0023] Step 3: building retaining walls on both sides of the connection structure section;

[0024] Step 4: filling the sand-gravel material roadbed layer within the range of the retaining walls on both sides of the connection structure section;

[0025] Step 5: laying the graded broken stone base on the filled sand-gravel material roadbed layer;

[0026] Step 6: pouring the cement concrete pavement layer on the graded broken stone base.

[0027] Compared with the prior art, the connection structure of an existing river-crossing bridge and a newly-built embankment and the construction method thereof have the beneficial effects of avoiding the demolition and reconstruction of the existing river-crossing bridge, reducing the engineering investment, saving the investment by using the sand-gravel material excavated from the river for filling the roadbed layer, and meeting the road traffic requirements with simple structure, convenient construction, easily-obtained materials, and low cost.

[0028] In order to make the above objectives, characteristics and advantages of the present application more apparent, the following preferred embodiments are specifically described in detail below, together with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 A plan view of the connection structure between the existing river-crossing bridge and the newly-built embankment according to an embodiment of the present application is shown in the following figure:

[0031] Figure 2 A cross-sectional view of the connection structure between the existing river-crossing bridge and the newly-built embankment according to an embodiment of the present application is shown in the following figure.

[0032] The figure is shown as follows:

[0033] 1. Up-slope section, 2. Straight section, 3. Down-slope section, 4. Retaining wall, 5. Sand-gravel subgrade layer, 6. Graded broken stone base layer, 7. Cement concrete pavement layer, 8. Inner slope intersection line, A. Existing river-crossing bridge, B. Newly-built embankment, C. Existing road, D. Designed flood level, E. Water flow direction, i. Slope. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0035] In the north of China, in the comprehensive management of small and medium-sized rivers, the existing cross-river bridges are often encountered. These existing cross-river bridges are generally more water-logged bridges, and the flood control standards are generally low, which cannot meet the river planning flood control standards and exist water blocking influence. If all the water-logged bridges are removed and the all-weather passing bridges are newly built according to the design flood and considering the clearance requirements, many low-grade roads will not be able to complete the construction task due to large funding gap. Moreover, for the relatively small traffic volume of low-grade roads, it is an unrealistic investment waste to completely cancel the water-logged bridges and build all-weather passing bridges. How to solve the connection between the existing cross-river bridges and the newly built embankment is a problem that should be solved.

[0036] In view of this, the embodiment of the present application provides a connection structure of an existing cross-river bridge and a newly built embankment, which comprises a rising slope section 1, a straight section 2, a descending slope section 3 and two side retaining walls 4. The rising slope section 1 starts at the intersection line 8 between the existing cross-river bridge A and the inner slope of the newly built embankment B, the flat slope section 2 is connected with the rising slope section 1, the descending slope section 3 is connected with the flat slope section 1 and is used for connecting the flat section 3 and the existing road C, and the retaining wall 4 is located on both sides of the rising slope section 1, the flat slope section 2 and the descending slope section 3 and is used for blocking the cross section of the newly built embankment B and the newly filled embankment.

[0037] In addition, another embodiment of the present application provides a construction method of a connection structure of an existing cross-river bridge and a newly built embankment, which comprises the following implementation steps:

[0038] Step 1, according to the design speed of the existing cross-river bridge A, the longitudinal slope and the radius and length of the convex vertical curve and the concave vertical curve of the rising slope section 1 and the descending slope section 3 are determined according to the “Rural Road Engineering Technical Specification” (GB / T 51224-2017).

[0039] The design speed of the existing cross-river bridge A is 15km / h, considering the actual situation, the slope i of the rising slope section 1 and the descending slope section 3 is 10% according to the “Rural Road Engineering Technical Specification” (GB / T 51224-2017); the radius of the concave vertical curve transition section between the rising slope section 1 and the existing cross-river bridge A and between the descending slope section 3 and the existing road C is 200m, and the length is 20m; the radius of the concave vertical curve transition section between the flat slope section 2 and the rising slope section 1 and the descending slope section 3 is 150m, and the length is 15m.

[0040] According to the water blocking influence of the existing cross-river bridge A, considering the height of the water accumulation, it is determined that the embankment top of the newly built embankment B should be raised by 0.5m. The elevation of the flat section 2 is flush with the elevation of the embankment top of the newly built embankment B, and the length is determined as 6m according to the width of the embankment top of the newly built embankment B.

[0041] Step 2, the position of the rising slope point is positioned, and the design parameters determined in step 1 are measured and laid out.

[0042] The starting point of the slope section 1 is located at the intersection line 8 of the existing cross-river bridge A and the inner slope of the newly built embankment B. The ending point of the slope section 1 is controlled by a 10% slope i, which is the starting point of the straight section 2. The ending point of the straight section 2 is controlled by a length of 6m, which is the starting point of the slope section 3. The ending point of the slope section 3 is controlled by a 10% slope i.

[0043] Step 3: Construct retaining walls on both sides of the entire connecting section of the road.

[0044] The constructed retaining wall 4 is a masonry gravity retaining wall with a top width of 50cm. The strength of the masonry blocks used is MU40, and the strength of the mortar is M10.

[0045] Step 4: Fill the retaining wall 4 on both sides of the entire connecting section of the road with the original road (bridge) surface with gravel road base 5.

[0046] The gravel road base 5 is constructed using gravel excavated from the riverbed, with layered filling and a compaction degree of 90%.

[0047] Step 5: Lay graded crushed stone base course 6 on the filled gravel road base course 5.

[0048] The graded crushed stone base course is 10cm thick and has a compaction degree of 96%.

[0049] Step 6: Pour a cement concrete pavement layer on the graded crushed stone base course.

[0050] The standard design flexural strength of the poured cement concrete pavement is 4.0 MPa, and the thickness is 20 cm.

[0051] Compared with existing technologies, the present invention proposes a connection structure between an existing cross-river bridge and a newly built embankment, and its construction method. The advantages are that it avoids the demolition and reconstruction of the existing cross-river bridge that obstructs water flow, thus reducing project investment; it uses gravel and sand excavated from the river channel to fill the roadbed, saving investment; the structure is simple, construction is convenient, materials are readily available, and the cost is low, meeting the requirements for road traffic.

[0052] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0053] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A structure for connecting an existing river-crossing bridge with a newly-built embankment, characterized in that it comprises an existing road, a connecting structure section, an existing river-crossing bridge and a newly-built embankment; the existing river-crossing bridge is connected with the connecting structure section; the connecting structure section comprises a sand-gravel material subgrade layer, a graded broken stone base layer laid on the sand-gravel material subgrade layer and a cement concrete pavement layer cast on the graded broken stone base layer; the cement concrete pavement layer is composed of a rising slope section, a straight section and a descending slope section, the rising slope section is connected with the existing river-crossing bridge at its starting point, the descending slope section is connected with the existing road at its ending point, and the straight section is located above the existing road; retaining walls are further provided on both sides of the connecting structure section; the starting point of the rising slope section is located at the intersection line between the existing river-crossing bridge and the inner slope of the newly-built embankment, and the ending point of the rising slope section penetrates through the newly-built embankment and is located above the existing road; the elevation of the straight section is level with the top elevation of the newly-built embankment, and the length of the straight section is not less than the width of the top of the newly-built embankment. The sand-gravel material subgrade layer is filled with sand-gravel material excavated from a river channel, and the compaction degree thereof is not less than 90%. The retaining walls are gravity-type retaining walls made of mortar-laid stones. The top width of the retaining walls is not less than 50 cm, the strength of the stones used for the retaining walls is not less than MU40, and the strength of the mortar is not less than M10. Concave vertical curve transition sections are provided between the rising slope section and the existing river-crossing bridge and between the descending slope section and the existing road. Convex vertical curve transition sections are provided between the straight section and the rising slope section and the descending slope section. The thickness of the graded broken stone base layer should not be less than 10 cm, and the compaction degree thereof should not be less than 96%. ​ 2. The connecting structure of an existing river-crossing bridge and a newly built embankment according to claim 1, wherein ​ 3. The connecting structure of an existing river-crossing bridge and a newly built embankment according to claim 1, wherein ​ 4. The connecting structure of an existing river-crossing bridge and a newly built embankment according to claim 3, wherein ​ 5. The connecting structure of an existing river-crossing bridge and a newly built embankment according to claim 1, wherein ​ 6. The connecting structure of an existing river-crossing bridge and a newly built embankment according to claim 1, wherein ​ 7. The connecting structure of an existing river-crossing bridge and a newly built embankment according to claim 1, wherein ​

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