Economical single-column traffic sign system based on composite pipe and direct-buried steel structure and regeneration landfill construction method

Abstract

The invention provides an economical single-column traffic sign system based on a composite pipe and a direct-buried steel structure and a regeneration landfill construction method, and relates to the technical field of traffic engineering.The system comprises a lower half stand column, an upper half stand column and a sign board, the upper half stand column and the lower half stand column are connected through a sleeve and fixed through a bolt along a through hole, and the sign board is arranged on the lower half stand column; the signboard is connected with the upper half stand column in a binding mode through steel belts. During construction, a direct-buried installation method is adopted, the foundation pit is filled with road engineering waste materials and reinforced with geogrids, and the structural stability is ensured through the layered landfill and tamping process. Traditional steel is replaced with low-cost pipes, a direct-buried structure is combined, a concrete foundation is omitted, the material and construction cost is remarkably reduced, meanwhile, the problem that a steel stand column is prone to being corroded and stolen is solved, structural checking calculation shows that the strength, the anti-overturning performance and the anti-sliding performance of the steel stand column meet the standard requirements, and the steel stand column has the advantages of being economical, efficient, environmentally friendly and sustainable.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of traffic engineering, and particularly relates to an economical single-column traffic sign system based on composite pipes and directly buried steel structures and a construction method for regeneration landfill. Background Art

[0002] With the rapid development of China's economy, highway construction and urban traffic construction are booming day by day, and the demand for traffic information is also increasing. To better manage traffic flow and effectively guide vehicles to pass through the road system, the demand for traffic signs is also increasing.

[0003] Currently, the column materials of single-column traffic signs mainly use steel pipes (Q235); the column installation is carried out by excavating a foundation pit, using C30 concrete for on-site casting, and pre-burying a base flange and anchor bolts on the top surface of the foundation. These three parts account for more than 70% of the total cost. In addition, due to the relatively high residual value of steel pipe columns, there is a risk of theft and they are easily lost.

[0004] Therefore, it is necessary to design a new type of traffic sign structure. Use low-cost nylon or other engineering plastic pipes to replace traditional steel pipes, and at the same time design a new buried structure to cancel the concrete foundation and flange, significantly reducing costs in terms of materials and construction technology. Summary of the Invention

[0005] The purpose of the present invention is to design an economical traffic sign structure system and construction method, significantly reducing costs in terms of materials and construction technology.

[0006] To achieve the above purpose, the present invention discloses an economical single-column traffic sign system based on composite pipes and directly buried steel structures, including a lower half column, an upper half column, and a sign board. It is characterized in that: the upper half column and the lower half column are connected by a sleeve and fixed with bolts along the through hole, and the sign board is connected to the upper half column by bundling with a steel belt.

[0007] Preferably, the lower half column is made of Q235 steel material. A vertically crossed X-shaped bearing plate is horizontally arranged in the middle of the main steel pipe column. Side plates are vertically arranged at the ends of the bearing plate. The side plates and the bottom end of the steel pipe column share a horizontal bottom plate. A cross column is arranged at the centroid position of the bottom plate for fixing the upper half column.

[0008] Preferably, the upper half column selects nylon or other engineering plastic pipes that meet the physical and chemical performance requirements. A groove is opened at the lower end of the upper half column, and the groove is clamped with the cross column.

[0009] Preferably, the sign board of the sign board is made of aluminum plate or composite plate, and the size is less than 2㎡

[0010] Preferably, there are two sets of the through holes, which are vertically and crosswise in direction, penetrate through the steel pipe column and the upper half column, and gaskets are arranged between the bolts and the steel pipe column.

[0011] The present invention also provides a method for constructing a regenerative landfill, which uses the above-mentioned economical single-column traffic sign system based on composite pipes and directly buried steel structures for installation construction. The landfill process includes the following steps:

[0012] For installing the economical single-column traffic sign system, first, dig an underground foundation pit. The size of the foundation pit is adapted to the size of the bottom plate, with a depth of 1 m, and the bottom is required to be flat. The location is selected on the road shoulder. Secondly, lay a layer of geogrid in the foundation pit before filling, place the traffic sign and ensure that the sign post is vertical, and then fill with road engineering waste with a filling height of 900 mm. The grading of the landfill waste is required to be reasonable, and a process test should be carried out before construction. The void ratio after filling should not be greater than 20%. Finally, fill the foundation pit with soil, leaving 1 m of the above-ground part of the steel pipe column. After filling the foundation pit, carry out compaction treatment with a compaction degree ≥ 95%, and ensure that the surface is flat and the inside is stable.

[0013] The present invention also provides a method for verifying the strength and stability of an economical single-column traffic sign system, which uses the above-mentioned economical single-column traffic sign system based on composite pipes and directly buried steel structures and the regenerative landfill construction method. The verification method includes the following steps:

[0014] Check the maximum normal stress of the column:

[0015] Check the maximum shear stress of the column:

[0016] Check the stress of the dangerous point:

[0017]

[0018] Check the deformation of the column:

[0019]

[0020] Check the average stress at the bottom of the sign:

[0021] Check the maximum value of the bottom stress:

[0022]

[0023] Check the minimum value of the bottom stress:

[0024]

[0025] Check the anti-overturning stability:

[0026]

[0027] Verification of sliding stability:

[0028] Among them, γ0 is the structural importance coefficient; take 1.0; γ Q is the partial coefficient of variable load; ρ is the air density; C is the wind force coefficient; v is the wind speed; A 牌 is the area of the sign board (A 牌 ≤2), A 柱 is the windward area of the column; H b is the distance from the centroid of the sign board to the connection of the upper half column and the lower half column; H p is the distance from the centroid of the windward area of the column to the connection of the upper half column and the lower half column; I p is the moment of inertia of the column section; S x is the static moment of the critical section of the column; H is the total height of the nylon column; E is the elastic modulus of the nylon material; A is the bottom area of the support; G is the vertical load; D 底 is the width of the bottom plate.

[0029] Technical effects and advantages of the present invention:

[0030] 1. The economical single-column traffic sign system based on composite pipes and directly buried steel structures of the present invention completely subverts the traditional design of using steel as the main material for columns in the prior art. Instead, low-cost pipes such as nylon or other engineering plastics are selected as construction materials, reducing the manufacturing cost of columns, reducing the material weight, increasing the safety of columns in traffic accidents, and solving problems such as easy rust corrosion and theft of steel columns.

[0031] 2. The economical single-column traffic sign system based on composite pipes and directly buried steel structures and the construction method of recycling and landfilling of the present invention completely subvert the design of using concrete and flange plates for sign construction in the prior art. Instead, a directly buried support structure is adopted. On the one hand, the use of cement and steel is eliminated, and the construction cost is greatly reduced; on the other hand, the support structure is installed in the pre-excavated foundation pit, and the construction process is simple.

[0032] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the drawings to fully understand the purpose, features and effects of the present invention. Description of the drawings

[0033] Figure 1 is the front schematic diagram of the overall structure of an embodiment of the present invention;

[0034] Figure 2 is the back schematic diagram of the overall structure of an embodiment of the present invention;

[0035] Figure 3 Schematic cross-section of the lower infrastructure of an embodiment of the present invention;

[0036] Figure 4 Schematic cross-section of the connection structure of an embodiment of the present invention;

[0037] Figure 5 Schematic cross-section of the structure after the construction of the regenerative landfill of an embodiment of the present invention;

[0038] Figure 6 Schematic diagram of the structural checking calculation process of an embodiment of the present invention.

[0039] Reference numerals are: 1, lower half column; 2, upper half column; 3, signboard; 4, through hole; 5, bolt; 6, steel strip; 7, foundation pit; 101, steel pipe column; 102, X-shaped bearing plate; 103, side plate; 104, bottom plate; 105, cross column; 201, groove; 501, gasket; 701, geogrid; 702, road engineering waste; 703, soil. Detailed implementation manners

[0040] The present invention will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0041] The present invention provides an economical single-column traffic sign system based on composite pipes and directly buried steel structures and a construction method for regenerative landfill, as Figures 1 to 4 shown, including a lower half column 1, an upper half column 2, and a signboard 3. The upper half column 2 and the lower half column 1 are connected by a sleeve and fixed along the through hole 4 using bolts 5. The signboard 3 is connected to the upper half column 2 by bundling with a steel strip 6.

[0042] As Figure 3 shown, the lower half column 1 is made of Q235 steel. A vertically crossed X-shaped bearing plate 102 is horizontally arranged in the middle of the main steel pipe column 101. Side plates 103 are vertically arranged at the ends of the bearing plate 102. The side plates 103 and the bottom end of the steel pipe column 101 share a horizontal bottom plate 104. A cross column 105 is arranged at the centroid position of the bottom plate 104 for fixing the upper half column 2. Among them, the size of the steel pipe column 101 is an outer diameter of 89 mm, an inner diameter of 77 mm, and a length of 2 m; the one-way length of the bearing plate 102 is 200 mm, the length of the side plate 103 is 500 mm, the widths of both are 60 mm, and the thicknesses are both 7 mm; the width of the cross web is the same as the outer diameter of the upper half column 2, which is 77 mm, the height is 50 mm, and the thickness is 4 mm; the length and width of the bottom plate 104 are both 700 mm, and the thickness is 6 mm.

[0043] The upper half column 2 is made of nylon PA66 material. A groove 201 is opened at the lower end of the upper half column 2. The groove 201 is clamped with the cross column 105, and the size of the groove 201 of the upper half column corresponds to the size of the cross column 105.

[0044] For the signboard 3, the signboard plate is made of aluminum plate or composite plate. A commonly used small sign ф800 circular sign for medium and low grade roads is selected, and the thickness is 3mm.

[0045] As Figure 4 shown, there are two groups of through holes 4, the directions of which are vertically crossed, passing through the steel pipe column 101 and the upper half column 2. A gasket 501 is arranged between the bolt 5 and the steel pipe column 101. Among them, the two groups of through holes 4 are respectively located at 100mm and 200mm from the upper edge of the steel pipe column 101. The bolt 5 is of M16 model and the length is 125mm.

[0046] As Figure 5 shown, the present invention also provides a construction method for regenerative landfill. The above-mentioned economic single-column traffic sign system based on composite pipes and directly buried steel structures is used for installation construction. The landfill process includes the following steps:

[0047] For installing the economic single-column traffic sign system, first, dig an underground foundation pit 7. The size of the foundation pit 7 is 700mm in length and width and 1m in depth. The bottom is required to be flat, and the location is selected on the road shoulder. Secondly, lay a layer of geogrid 701 in the foundation pit 7 before filling, place the traffic sign and ensure that the sign post is vertical, and then fill the road engineering waste 702 with a filling height of 900mm. The landfill waste grading is required to be reasonable, and a process test should be carried out before construction. The void ratio after filling should not be greater than 20%. Finally, fill the foundation pit 7 with soil 703, and leave 1m of the above-ground part of the steel pipe column 101. After filling the foundation pit 7, compacting treatment is carried out, and the compaction degree ≥ 95%, and the surface is required to be flat and the inside is stable.

[0048] As Figure 6 shown, the present invention also provides a method for verifying the strength and stability of the economic single-column traffic sign system. The above-mentioned economic single-column traffic sign system based on composite pipes and directly buried steel structures and the construction method for regenerative landfill are adopted. The verification method includes the following steps:

[0049] Taking a certain area in Heilongjiang Province as an example, the maximum wind speed value is 20m / s, and the wind load received by the signboard is 0.207kN, and the wind load received by the column is 0.054kN; the total gravity load of the nylon traffic sign and the landfill waste is 8.448kN; after checking:

[0050] The maximum normal stress of the column σ1 = 5.33Mpa ≤ 23Mpa;

[0051] The maximum shear stress of the column τ1 = 2.54MPa ≤ 10Mpa;

[0052] The stress σ4 at the dangerous point is 7.5 MPa ≤ 22 Mpa;

[0053] The deformation of the column is 0.004 < 1 / 100;

[0054] The average stress σ at the bottom of the sign c = 17.24 kPa ≤ 290 kPa;

[0055] The maximum value of the bottom stress σ max = 25.07 kPa ≤ 348 kPa;

[0056] The minimum value of the stress at the bottom of the support σ min = 9.41 > 0;

[0057] The anti-overturning stability k0 = 6.6 > 1.2;

[0058] The foundation sliding stability k c = 16.18 > 1.2.

[0059] The designed structural strength and stability of the traffic sign both meet the requirements of relevant national codes.

[0060] For selecting other common pipe materials (such as PPR plastic pipes) as the upper column material, the structural calculation of the traffic sign also needs to be carried out, and the calculation method is the same as that of the above nylon traffic sign.

[0061] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. An economical single-column traffic sign system based on composite pipes and directly buried steel structures, comprising a lower half column (1), an upper half column (2), and a sign board (3), characterized in that: The upper half column (2) and the lower half column (1) are connected by a sleeve and fixed along the through hole (4) with bolts (5). The signboard (3) and the upper half column (2) are connected by bundling with a steel strip (6).

2. The economic single-column traffic sign system based on composite pipes and directly buried steel structures according to claim 1, characterized in that: The lower half column (1) is made of Q235 steel. In the middle of the main steel pipe column (101), an X-shaped bearing plate (102) is horizontally arranged in a vertical cross manner. At the end of the bearing plate (102), a side plate (103) is vertically arranged. The side plate (103) and the bottom end of the steel pipe column (101) share a horizontal bottom plate (104). At the centroid position of the bottom plate (104), a cross column (105) is arranged to fix the upper half column (2).

3. An economical single-column traffic sign system based on composite pipes and directly buried steel structures according to claim 1, characterized in that: The upper half column (2) selects nylon or other engineering plastic pipes, and the pipes meet the physical and chemical performance requirements. A groove (201) is opened at the lower end of the upper half column (2), and the groove (201) is clamped with the cross column (105).

4. An economic single-column traffic sign system based on composite pipes and directly buried steel structures according to claim 1, characterized in that: The signboard plate of the signboard (3) is made of aluminum plate or composite plate, and the size is less than 2 square meters.

5. An economical single-column traffic sign system based on composite pipes and directly buried steel structures according to claim 1, characterized in that: There are two groups of the through holes (4), and the directions are vertically crossed, passing through the steel pipe column (101) and the upper half column (2). A gasket (501) is arranged between the bolt (5) and the middle of the steel pipe column (101).

6. A method for construction of a regenerated landfill, which is carried out by installing and constructing with the economic single-column traffic sign system based on composite pipes and directly buried steel structures as described in claims 1-5, is characterized in that, The landfill process includes the following steps: For installing an economical single-column traffic sign system, first, dig an underground foundation pit (7). The size of the foundation pit (7) is adapted to the size of the bottom plate, with a depth of 1 m, and the bottom is required to be flat. The location is selected on the road shoulder. Secondly, lay a layer of geogrid (701) in the foundation pit (7) before filling. Place the traffic sign and ensure that the sign post is vertical. Then fill with road engineering waste (702) to a filling height of 900 mm. The landfill waste grading is required to be reasonable, and a process test should be carried out before construction. The void ratio after filling should not be greater than 20%. Finally, fill the foundation pit (7) with soil (703). Keep 1 m of the above-ground part of the steel pipe column (101). After the foundation pit (7) is filled, compacting treatment is carried out, and the compaction degree is ≥ 95%, and the surface is required to be flat and the inside is stable.

7. A method for verifying the strength and stability of an economical single-column traffic sign system, which uses the economical single-column traffic sign system and the construction method of recycling landfill based on composite pipes and directly buried steel structures described in claims 1-6, characterized in that, The verification method includes the following steps: (1) Column strength check: Check for the maximum normal stress: σ1 ≤ γσ d ; Check for the maximum shear stress of the column: τ1 ≤ τ d ; Check for the stress at the critical point: σ4 ≤ βσ d . (2) Column deformation check: Column deformation < 1 / 100. (3) Foundation check: Check the average stress at the bottom of the sign: σ c ≤290 kPa; Check the extreme stress at the bottom: σ max ≤1.2 × 290 kPa, σ min >0; Check the anti-overturning stability: k0>1.2; Check the sliding stability: k c >1.2.

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