Road embankment widening method and structure based on L-shaped stop blocks

Abstract

A highway embankment widening method and a highway embankment widening structure based on symmetrical assembly of L-shaped stop dogs are characterized in that the L-shaped stop dogs (2) are symmetrically arranged on one side or two sides of an earth shoulder of an old road before transformation, each L-shaped stop dog (2) is of a reinforced concrete structure formed by integrally casting a side wall (201) and a bottom plate (202) in situ, the bottom plate (202) is borne in an old road bed (1), and the L-shaped stop dogs (2) are arranged on the side wall (201) and the bottom plate (202). The inner side of the side wall (201) intersects with the narrowest point of the old road surface (3), a filling space (4) which is formed for facilitating installation of the L-shaped check block (2) is formed between the inner side face of the side wall (201) and the innermost side of the bottom plate (202) and between the inner side face of the side wall (201) and the surface, not connected with the side wall (202), of the bottom plate (202), and the filling space (4) is filled with filling materials matched with materials of the old road surface (3). By arranging the L-shaped check blocks, the whole device can be used for binding reinforcing steel bars and concrete on site, construction is convenient and simple, and the construction speed is high.

Description

Technical Field

[0001] This invention relates to the field of civil engineering highway technology, and in particular to a technology for renovating old embankments, specifically a highway embankment widening method based on L-shaped blocks and a new embankment structure. Background Art

[0002] With the rapid development of the economy and society, the local roads built in the early stage, after more than ten years of operation, have gradually failed to meet the requirements of mixed pedestrian and non-pedestrian traffic or driving comfort, so it is necessary to widen the roadbed and renovate the road surface at the same time.

[0003] In engineering practice, highway embankment widening is generally done on both sides or on one side. The two-side widening is divided into two-side equal-width widening and two-side unequal-width widening. According to conventional experience or customary practices, when the width of the embankment is greater than 1.5m, it can be widened by excavating steps and then filling and sloping; when the width of the embankment is less than 1.5m, in order to ensure the minimum mechanical construction width, the method of super-wide filling roadbed outside the old road and then cutting the slope is often adopted. However, this method requires additional land, additional demolition, and the super-wide filling roadbed needs to be excavated later, which wastes resources, increases construction costs, and cannot reflect the concept of green and sustainable development.

[0004] Therefore, how to provide a road embankment widening structure and construction method that does not require additional land occupation and demolition, avoids waste of resources, can overcome differential settlement, is easy to construct and has a moderate cost is one of the technical problems that urgently need to be solved in this field. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that when the existing embankment widening width is less than 1.5m, in order to ensure the minimum mechanical construction width, a method of super-wide filling roadbed on the outer side of the old road is often adopted and the slope is finally cut, which requires additional land and additional demolition, and the super-wide filling roadbed needs to be excavated at a later stage, which wastes resources, increases construction costs and cannot reflect green and sustainable development. A highway embankment widening method based on L-shaped blocks and a new embankment structure are invented.

[0006] One of the technical solutions of the present invention is: A highway embankment widening method based on L-shaped blocks comprises the following steps: S1: Dig out the earth shoulder of the old road and break the edge of the pavement structure layer within the scope of the earth shoulder of the old road; S2: Loft out the top edge line of the widened roadbed, which is the outer edge line of the L-shaped stopper. Continue to loft out the inner edge line of the L-shaped stopper according to the structural width of the L-shaped stopper. S3: Based on the inner and outer edge lines of the L-shaped stopper that have been laid out, a foundation trench is excavated for the old roadbed, and the excavation depth is controlled according to the thickness of the bottom plate of the L-shaped stopper; S4: Set up the formwork according to the drawings, tie the steel bars, and finally pour C30 cement concrete. The blocks are set at 15m intervals to reserve expansion joints; S5: The filling plan for the filling space between the old road pavement structure and the L-shaped block side wall is determined in combination with the old road pavement reconstruction plan.

[0007] Preferably, the base of the L-shaped stopper may be processed by providing a crushed stone cushion layer to meet the bearing capacity requirements of the base.

[0008] Preferably, the top of the L-shaped block side wall can be processed by setting a customized greening groove to meet the greening needs.

[0009] The second technical solution of the present invention is A novel highway embankment widening structure comprises an old roadbed 1, the lower part of the old roadbed 1 is an old road subgrade 5, the upper part is an old road pavement 3, the two sides of the highway embankment composed of the old road pavement 3, the old roadbed 1 and the old road subgrade 5 are inclined structures, and the characteristic is that: an L-shaped stopper 2 is symmetrically arranged on one side or both sides of the old road earth shoulder before reconstruction, the L-shaped stopper 2 is a reinforced concrete structure formed by integrally cast-in-place of a side wall 201 and a bottom plate 202, the bottom plate 202 is supported in the old roadbed 1, the inner side of the side wall 201 intersects with the narrowest point of the old road pavement 3 (that is, the inner side of the side wall 201 should intersect with the widened pavement), and a filling space 4 is formed between the inner side surface of the side wall 201 and the innermost side of the bottom plate 202 and the surface of the bottom plate 202 not connected to the side wall 202 to facilitate the installation of the L-shaped stopper 2, and the filling space 4 is filled with a filling material matching the material of the old road pavement 3.

[0010] Preferably, the L-shaped stopper is a cast-in-place reinforced concrete structure, which is formed into an L shape by a side wall and a bottom plate.

[0011] Preferably, the top outer edge of the L-shaped block side wall is aligned with the top outer edge of the widened roadbed, the side wall width is controlled according to the earth shoulder of the new road after the old road is widened, the top surface of the side wall is controlled to be 1 to 2 cm lower than the earth shoulder of the new road, and the buried depth of the side wall is controlled according to the top of the old road bed.

[0012] Preferably, the L-shaped block bottom plate is connected to the bottom of the side wall, the inner edge of the bottom plate is determined according to the width of the old roadbed, the minimum is controlled at 175cm, and the bottom plate thickness can be controlled at 22cm.

[0013] Preferably, the concrete in the L-shaped block is C30 cement concrete, and the steel bars are composed of stress-bearing steel bars and structural steel bars, numbered ① to ⑤.

[0014] Preferably, when a crash-proof guardrail is required, a corrugated beam guardrail can be provided by pre-embedding a guardrail column sleeve 203 in the L-shaped block side wall; the sleeve height is controlled according to the height of the L-shaped block side wall, the sleeve diameter should be 4 to 10 cm wider than the column diameter, and reinforcing ribs are arranged around the sleeve.

[0015] Compared with the prior art, the present invention has achieved the following technical effects: 1) The present invention directly sets an L-shaped block outside the old roadbed, eliminating the need for additional land occupation and demolition; 2) The present invention avoids the waste caused by excavation after over-wide filling of the roadbed, saves construction costs and resources; 3) The present invention can effectively reduce the differential settlement of the new and old roadbeds by directly setting L-shaped blocks on the roadbed of the old road that has been in operation and compacted for many years; 4) The present invention provides an L-shaped stopper, so that the steel bars can be tied and concrete can be delivered on site, which makes the construction convenient and simple, and the construction speed is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an existing highway before widening and reconstruction.

[0017] Figure 2 The present invention is a schematic structural diagram of a new highway embankment widening structure used to widen an existing highway.

[0018] Figure 3 It is a structural design diagram of the L-shaped stopper in the present invention.

[0019] Figure 4 It is a large-scale drawing of the steel bars of the L-shaped stopper in the present invention.

[0020] Figure 5 It is a large-scale drawing of the guardrail column sleeve in which the L-shaped stopper is embedded in the present invention. Figure 5 A is a schematic diagram of the vertical structure of the guardrail column sleeve. Figure 5 B is a schematic diagram of the plane structure of the guardrail column sleeve.

[0021] In the figure: 1, old roadbed; 2, L-shaped block; 201, side wall; 202, bottom plate; 203, embedded guardrail column sleeve; 3, old road pavement; 4, filling space; 5, old road subgrade, 6 is the existing river protection slope structure; 7 is the newly built earth shoulder; 8 is the newly built carriageway; 9 is the old road carriageway; 10 is the center line of the road; 11 is the old road earth shoulder. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0023] Reference Figure 2-5shown.

[0024] A new highway embankment widening structure comprises an old roadbed 1, the lower part of the old roadbed 1 is an old road subgrade 5, the upper part is an old road pavement 3, the two sides of the highway embankment composed of the old road pavement 3, the old roadbed 1 and the old road subgrade 5 are inclined structures, and L-shaped blocks 2 are symmetrically arranged on one side or both sides of the old road earth shoulder before the reconstruction. Figure 2 The L-shaped stopper 2 is a reinforced concrete structure formed by integrally casting the side wall 201 and the bottom plate 202. Figure 3 As shown, the bottom plate 202 is supported in the old roadbed 1, and the inner side of the side wall 201 intersects with the narrowest point of the old road surface 3, as shown in FIG. Figure 2 As shown, a filling space 4 is formed between the inner side of the side wall 201 and the innermost side of the bottom plate 202 and the surface of the bottom plate 202 not connected to the side wall 202 to facilitate the installation of the L-shaped stopper 2. The filling space 4 is filled with a filling material that matches the material of the old road surface 3 and forms a part of the new road surface. In specific implementation, greening soil can be laid on the surface of the side wall 201 of the L-shaped stopper 2 as needed to form a new earth shoulder 7.

[0025] In this embodiment, the L-shaped stopper 2 includes a side wall 201 , a bottom plate 202 disposed at the bottom of the side wall 201 , and a sleeve 203 pre-embedded in the side wall 201 .

[0026] In this embodiment, the L-shaped stopper 2 is a cast-in-place structure; the bottom of the side wall 201 is rigidly connected to the bottom plate 202; the embedded guardrail column sleeve 203 is arranged inside the side wall 201, such as Figure 3 The structure and size of the embedded guardrail column sleeve 203 are as shown in FIG. Figure 5 shown.

[0027] In this embodiment, the side wall 201 is buried in the new road shoulder after the old road is widened; the top surface of the side wall 201 is controlled to be 1-2 cm lower than the new road shoulder; the bottom surface of the side wall 201 is flush with the top surface of the old road bed 1.

[0028] In this embodiment, the bottom plate 202 is buried in the old roadbed 1 ; the top surface of the bottom plate 202 is flush with the top surface of the old roadbed 1 .

[0029] In this embodiment, the hollow portion between the L-shaped stopper 2 and the old road surface 3 is filled with the road surface 4 in combination with the old road surface reconstruction plan.

[0030] In this embodiment, the L-shaped stopper 2 reserves expansion joints at intervals of 15m, and the size setting and calculation of the expansion joints are the same as those in the prior art manual.

[0031] In this embodiment, the L-shaped stopper 2 is a cast-in-place reinforced concrete structure, the concrete strength grade is controlled to be no less than C30, and HRB400 steel bars and HPB300 steel bars are configured inside. Figure 4 shown. Example

[0032] A highway embankment widening method based on L-shaped blocks comprises the following steps: S1: Dig out the earth shoulder of the old road and break the edge of the pavement structure layer on one or both sides of the earth shoulder of the old road; S2: Loft out the top edge line of the widened roadbed, which is the outer edge line of the L-shaped stopper. Continue to loft out the inner edge line of the L-shaped stopper according to the structural width of the L-shaped stopper. S3: Based on the inner and outer edge lines of the L-shaped stopper that have been laid out, a foundation trench is excavated for the old roadbed, and the excavation depth is controlled according to the thickness of the bottom plate of the L-shaped stopper; S4: Set up the formwork and tie the steel bars according to the drawings, and finally pour C30 cement concrete. The length of the L-shaped block is 15m apart to reserve expansion joints; S5: Determine the filling plan in the filling space between the old road pavement structure and the side wall of the L-shaped block in combination with the old road pavement reconstruction plan (the filling materials and sequence can be implemented by referring to the conventional pavement construction specifications).

[0033] Preferably, a crushed stone cushion layer may be provided under the L-shaped stopper bottom plate 202 to meet the bearing capacity requirements of the base.

[0034] Preferably, the top of the L-shaped block side wall 201 can be processed by setting a customized greening groove and pre-embedded guardrail column sleeve to meet greening and safety requirements.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

[0036] The present invention does not involve parts that are the same as the prior art or can be implemented by using the prior art.

Claims

1. A highway embankment widening method based on L-shaped blocks, characterized by: It includes the following steps: S1: Dig out the earth shoulder of the old road and break the edge of the pavement structure layer on both sides or one side of the earth shoulder of the old road; S2: Loft out the top edge line of the widened roadbed, which is the outer edge line of the L-shaped stopper. Continue to loft out the inner edge line of the L-shaped stopper according to the structural width of the L-shaped stopper. S3: Based on the inner and outer edge lines of the L-shaped stopper that have been laid out, a foundation trench is excavated for the old roadbed, and the excavation depth is controlled according to the thickness of the bottom plate of the L-shaped stopper; S4: Set up the formwork and tie the steel bars according to the drawings, and finally pour C30 cement concrete. The length of the L-shaped block is 15m apart to reserve expansion joints; S5: Determine the filling plan in the filling space between the old road pavement structure and the side wall of the L-shaped block in combination with the old road pavement reconstruction plan.

2. The method according to claim 1, characterized in that: The base of the L-shaped stopper is processed by providing a crushed stone cushion layer to meet the requirements of the base bearing capacity.

3. The method according to claim 1, characterized in that: The top of the L-shaped block side wall is processed by setting a customized greening groove to meet the greening needs.

4. The method according to claim 1, characterized in that: The concrete in the L-shaped stopper is C30 cement concrete, and the steel bars are composed of stress-bearing steel bars and structural steel bars.

5. The method according to claim 1, characterized in that: When an anti-collision guardrail is arranged on the top of the L-shaped block side wall, it is arranged to form a corrugated beam guardrail by pre-embedding a guardrail column sleeve in the L-shaped block side wall; the sleeve height is controlled according to the height of the L-shaped block side wall, the sleeve diameter is 4 to 10 cm wider than the column diameter, and reinforcing ribs are arranged around the sleeve.

6. A novel highway embankment widening structure, comprising an old roadbed (1), the lower part of the old roadbed (1) being an old road subgrade (5), the upper part being an old road pavement (3), the old road pavement (3), the old roadbed (1) and the old road subgrade (5) forming a sloping structure on both sides of the highway embankment, characterized in that: An L-shaped stopper (2) is arranged on one or both sides of the earth shoulder of the old road before reconstruction. The L-shaped stopper (2) is a reinforced concrete structure formed by integrally casting a side wall (201) and a bottom plate (202). The bottom plate (202) is supported in the roadbed (1) of the old road. The inner side of the side wall (201) intersects with the narrowest point of the old road surface (3). A filling space (4) is formed between the inner side of the side wall (201) and the innermost side of the bottom plate (202) and the surface of the bottom plate (202) not connected to the side wall (202) to facilitate the installation of the L-shaped stopper (2). The filling space (4) is filled with a filling material that matches the material of the old road surface (3).

7. The novel highway embankment widening structure according to claim 6 is characterized by: The top outer edge of the L-shaped block side wall is aligned with the top outer edge of the roadbed after widening. The width of the side wall is controlled by the earth shoulder of the new road after widening the old road. The top surface of the side wall is controlled to be 1 to 2 cm lower than the earth shoulder of the new road. The buried depth of the side wall is controlled by the top of the old road bed.

8. The novel highway embankment widening structure according to claim 6 is characterized by: The bottom plate of the L-shaped block is connected to the bottom of the side wall. The inner edge of the bottom plate is determined according to the width of the old roadbed, with a minimum width of 175cm, and the thickness of the bottom plate is controlled at 22cm.

9. The novel highway embankment widening structure according to claim 6 is characterized by: The concrete in the L-shaped block is C30 cement concrete, and the steel bars consist of stress-bearing steel bars and structural steel bars.

10. The novel highway embankment widening structure according to claim 6 is characterized by: An anti-collision guardrail is arranged in the side wall of the L-shaped stopper. The anti-collision guardrail is formed by pre-embedding a guardrail column sleeve (203) in the side wall of the L-shaped stopper. The sleeve height is controlled according to the height of the side wall of the L-shaped stopper. The sleeve diameter is preferably 4 to 10 cm wider than the column diameter. Reinforcement ribs are arranged around the sleeve.

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