Urban road reconstruction method and structure combined with flood control wall and rear abutment

Abstract

The present invention discloses a method for reconstructing an urban road jointly built with a flood control wall and a rear abutment and a road structure. The present invention excavates the back abutment of a local road section and then reinforces the vertical wall and the thick heel plate of the flood control wall after the back abutment is excavated; then cement soil mixing piles are arranged on the outer side of the wall heel; a new road surface is built on the reinforced part of the back heel plate of the flood control wall and the cement soil mixing piles; the present invention widens the riverside road and meets the width requirement of the urban riverside road reconstruction and upgrading, and compared with partially canceling the non-motor vehicle lane or compressing the sidewalk width, the complete function and quality of the riverside road are guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of urban riverside road reconstruction projects, and in particular to an urban road reconstruction method and road structure jointly built with a flood control wall and a rear abutment. Background Art

[0002] The high-quality development of my country's economy and society, the continuous growth of urban car ownership and the increasing living standards of the people have further put forward higher requirements on the number of motor vehicle lanes and the width of slow-moving systems on urban roads; due to urban development and planning adjustments, the functional positioning of some riverside roads has changed, the road grade has been improved, and the planned road width has increased; however, urban riverside roads are often restricted by embankments or flood walls on one side and by buildings such as urban commercial and residential buildings on the other side. The current total width is limited, and some sections are difficult to meet the width requirements for urban road renovation and upgrading; there are no relevant regulations for this situation in the current specifications; in the practice of urban riverside road renovation, for situations where the road width is limited, measures such as partially canceling non-motor vehicle lanes and narrowing the sidewalk width are generally taken to reduce the function of the road, affecting the quality of the riverside roads. Summary of the invention

[0003] The purpose of the present invention is to comprehensively consider functions such as flood control and transportation, and propose a method for reconstructing an urban road built together with a flood control wall and a rear abutment, as well as a road structure after the existing urban road built together with a flood control wall and a rear abutment is reconstructed to improve the situation where the width of local road is limited in urban riverside roads.

[0004] To achieve the above objectives, the technical solution of the present invention is:

[0005] A method for urban road reconstruction with a flood control wall and a rear abutment, comprising the following steps:

[0006] Remove the existing backfill of the abutment in some sections of the road; reinforce the existing flood control wall; install cement-soil mixing piles; and build a new road surface.

[0007] Furthermore, the flood wall reinforcement includes flood wall vertical wall reinforcement and flood wall rear heel plate reinforcement, and after reinforcement, a flood wall vertical wall reinforcement part and a flood wall thick heel plate reinforcement part are formed.

[0008] Furthermore, the reinforcement of the flood wall vertical wall is to thicken the wall of the flood wall vertical wall below the design flood level after the backfill of the rear abutment is removed.

[0009] Furthermore, the flood wall reinforcement adopts main reinforcement, distributed steel bars, embedded steel bars and concrete. The main reinforcement is arranged horizontally along the back water surface of the flood wall, the distributed steel bars are arranged longitudinally along the back water surface of the flood wall, and the first embedded steel bars are implanted in the back water surface of the flood wall; the main reinforcement, distributed steel bars and the first embedded steel bars are cross-connected with each other and then poured with concrete.

[0010] Furthermore, the reinforcement of the rear heel plate of the flood wall includes thickening the rear heel plate of the flood wall after the backfill of the rear abutment is removed.

[0011] Furthermore, the reinforcement of the rear heel plate of the flood wall also includes widening the rear heel plate of the flood wall after the backfill of the rear abutment is removed, and then thickening the rear heel plate of the flood wall on the basis of the widening.

[0012] Furthermore, the reinforcement part of the rear heel plate of the flood wall includes a top plate and a bottom plate, the bottom plate is connected to the rear heel plate of the existing flood wall, and the top plate is horizontal; the rear heel plate of the flood wall is reinforced by using top plate main reinforcement, top plate distributed reinforcement, bottom plate main reinforcement, second embedded reinforcement and concrete; the top plate main reinforcement is arranged horizontally above the rear heel plate of the flood wall, and the top plate distributed reinforcement is arranged longitudinally above the rear heel plate of the flood wall; the bottom plate main reinforcement is arranged horizontally on the rear heel plate; the top plate main reinforcement, bottom plate main reinforcement, top plate distribution reinforcement and second embedded reinforcement are cross-connected with each other and then poured with concrete.

[0013] Furthermore, the setting of cement soil mixing piles includes arranging 3 to 4 rows of cement soil mixing piles outside the wall heel, laying a layer of anti-seepage geomembrane on the pile tops, and the cement soil mixing piles are arranged in a square or plum blossom shape.

[0014] Furthermore, the newly built road surface is a crushed stone cushion layer, concrete or permeable bricks laid on the rear heel plate reinforcement part and cement soil mixing piles of the flood control wall.

[0015] An urban road structure formed by using the above-mentioned urban road reconstruction method, comprising an existing flood wall, a rear abutment, a flood wall vertical wall reinforcement portion, a flood wall rear heel plate, a flood wall rear heel plate reinforcement portion, cement soil mixing piles, and a newly built road surface structure;

[0016] The flood wall reinforcement part is a slope, close to the flood wall, specifically close to the backwater surface of the flood wall. The flood wall reinforcement part is located on the backwater side of the flood wall and is below the design flood level.

[0017] The flood wall rear heel plate reinforcement portion includes a flood wall rear heel plate thickened portion, the flood wall rear heel plate thickened portion is located above the flood wall rear heel plate, and the bottom plate of the thickened portion is adjacent to the existing flood wall rear heel plate and connected to the existing flood wall rear heel plate;

[0018] The flood wall rear heel plate reinforcement portion also includes a flood wall rear heel plate widening portion;

[0019] Cement soil mixing piles are arranged outside the wall heel;

[0020] The new pavement structure is located on the flood wall rear heel plate reinforcement and cement soil mixing piles.

[0021] The beneficial effects of the present invention are:

[0022] The present invention is used for the reconstruction of urban riverside roads. When the width of a part of the urban riverside road is limited, on the premise of ensuring urban flood control safety, the backfill of the rear apron is partially excavated and the flood control wall is reinforced. A new road surface is built on the part of the original rear apron, thereby widening the riverside road and meeting the width requirement for the reconstruction and upgrading of the urban riverside road. Compared with partially canceling the non-motorized vehicle lane or compressing the width of the sidewalk, the complete function and quality of the riverside road are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure for transforming the flood wall and back platform into an urban road.

[0024] Figure 2 Schematic diagram of reinforcement for flood wall.

[0025] 1 is the vertical wall of the flood wall; 2 is the existing rear abutment; 3 is the reinforcement part of the vertical wall of the flood wall; 4 is the rear heel plate of the flood wall; 5 is the reinforcement part of the thick heel plate of the flood wall; 6 is the cement-soil mixing pile; 7 is the newly built pavement structure; 8 is the anti-seepage geomembrane, and 9 is the design flood level.

[0026] 31 is the main reinforcement, 32 is the distribution reinforcement, 33 is the first embedded reinforcement, 51 is the main reinforcement of the top plate, 52 is the main reinforcement of the bottom plate, 53 is the top plate distribution reinforcement; 54 is the second embedded reinforcement. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the invention clearer, the present invention is further described below with reference to the accompanying drawings.

[0028] A method for reconstructing an existing urban road built with a flood wall and a rear abutment comprises the following steps:

[0029] The backfill of the rear abutment in some sections of the road will be removed; if there is a narrow road width in some parts of the urban riverside road, the backfill of the rear abutment next to the narrow section of the road will be removed.

[0030] The existing flood wall is reinforced; in order to protect the city's flood control safety and ensure the stability of the existing flood wall, the existing flood wall must be reinforced after the existing rear abutment 2 of the local section is excavated. The flood wall reinforcement part includes the reinforcement of the flood wall upright wall 1 and the reinforcement of the flood wall rear heel plate 4. The flood wall upright wall 1 and the flood wall rear heel plate 4 are reinforced with reinforced concrete; the reinforcement of the flood wall upright wall 1 refers to the thickening of the wall of the flood wall upright wall 1 below the design flood level 9 after the backfill of the rear abutment is excavated; the reinforcement of the flood wall rear heel plate 4 refers to the thickening of the existing flood wall rear heel plate 4, which can also be widened if necessary; after the reinforcement, the anti-sliding stability safety factor Kc, the anti-tilting stability safety factor K0, and the ratio of the maximum value to the minimum value of the base stress σmax / σmin of the flood wall under normal operating conditions and extraordinary operating conditions all meet the relevant requirements of the current "Code for Design of Embankment Engineering" (GB50286-2013).

[0031] The anti-sliding stability safety factor of the reinforced flood wall is Kc=f∑W / ∑P, where ∑W is the sum of all vertical forces acting on the reinforced flood wall (kN); ∑P is the sum of all horizontal forces acting on the reinforced flood wall (kN); f is the friction coefficient between the bottom plate of the flood wall and the embankment foundation.

[0032] After reinforcement, the anti-sliding stability safety factor of the flood wall is K0 = ∑MV / ∑MH, where MV is the anti-overturning moment (kN·m) and MH is the overturning moment (kN·m).

[0033] After reinforcement, the compressive stress of the flood wall base σmax, σmin = ∑G / A±∑M / ∑W, ∑G is the vertical load of the flood wall (kN); A is the bottom plate area of ​​the flood wall after reinforcement (m2); ∑M is the moment of the load on the bottom plate centroid axis (kN·m); ∑W is the bottom plate section coefficient of the flood wall after reinforcement (m3). The concrete strength grade of the reinforced part of the flood wall is not less than C30.

[0034] The flood wall reinforcement part 3 is a slope, and the side slope ratio is 1:0.1 to 1:0.3. Figure 1 and Figure 2The corner where the middle flood wall 1 and the rear heel plate 4 of the flood wall intersect is defined as the reinforcement of the flood wall 1; the main reinforcement 31 of the flood wall reinforcement part 3 adopts HRB400 grade steel bars with a diameter of more than 22mm, which are arranged horizontally along the back water surface of the flood wall, with a spacing of 100-150mm; the distributed steel bars 32 of the flood wall reinforcement part 3 adopt HRB400 grade steel bars with a diameter of 12-16mm and are arranged longitudinally along the back water surface of the flood wall, with a spacing of 150-200mm; in order to ensure the connection effect of the new and old concrete, the back water surface of the existing flood wall is The surface is roughened, rinsed, coated with interface agent and rebar is planted. The interface agent uses Class A adhesive. The first rebar 33 of the flood wall reinforcement part uses HPB300 grade steel bars with a diameter of 10mm. The horizontal and vertical arrangement spacing of the first rebar 33 is 200-300mm, and the depth of implantation in the back water surface of the existing flood wall is 100-150mm; the main reinforcement 31 of the flood wall reinforcement part 3, the distribution steel bars 32, and the first rebar 33 are cross-connected with each other. After the main reinforcement 31, the distribution steel bars 32, and the first rebar 33 of the flood wall reinforcement part 3 are arranged, concrete is poured.

[0035] The concrete strength grade of the flood wall back heel plate reinforcement part 5 is not less than C30. The flood wall back heel plate reinforcement part 5 includes a top plate and a bottom plate. The bottom plate is connected to the existing flood wall back heel plate 4. The top plate is horizontal. The end of the flood wall back heel plate 4 away from the flood wall vertical wall 1 is the wall heel. Figure 1 The thickness of the middle thickening is represented by H. The thickness of the reinforcement at the wall heel is not less than 1m, that is, the thickness of the reinforcement at the end of the flood wall back heel plate 4 away from the flood wall vertical wall 1 is not less than 1m; according to the actual situation, if necessary, the flood wall back heel plate 4 can be widened at the same time, and then thickened on the basis of widening. Figure 1 The width of the widening is represented by D; Figure 1As shown, in this embodiment, the rear heel plate 4 of the flood wall is first widened by 0.5m, and then the rear heel plate 4 of the flood wall is thickened on the basis of widening, and the heel wall is thickened by 1m; the rear heel plate reinforcement part 5 of the flood wall, that is, the top plate main reinforcement 51 and the bottom plate main reinforcement 52 used in the widening and thickening of the rear heel plate 4 of the flood wall adopt HRB400 grade steel bars with a diameter of more than 22mm, and the top plate distribution reinforcement 53 adopts HRB400 grade steel bars with a diameter of 12-16mm; the top plate main reinforcement 51 is arranged horizontally above the rear heel plate 4 of the flood wall with a spacing of 100-150mm, and the top plate distribution reinforcement 53 is arranged longitudinally above the rear heel plate 4 of the flood wall with a spacing of 150-200mm; the bottom plate main reinforcement 52 is arranged horizontally on the rear heel plate with a spacing of 100-150mm, and the rear heel plate reinforcement part 5 The bottom plate is connected with the existing flood wall rear heel plate 4; in the case of not widening but only thickening, the existing flood wall rear heel plate 4 already has distributed steel bars, and the bottom plate of the flood wall rear heel plate reinforcement part 5 may not be provided with distributed steel bars; in order to ensure the connection effect of the new and old concrete, the existing flood wall rear heel plate is roughened, rinsed, coated with an interface agent and embedded with steel bars, the interface agent uses a Class A adhesive, and the embedded steel bars use HPB300 grade steel bars with a diameter of 10mm. The second embedded steel bars 54 are arranged at a horizontal and vertical spacing of 200 to 300mm, and the second embedded steel bars 54 are embedded in the existing flood wall rear heel plate to a depth of not less than 100mm; reinforced concrete is used for the thickening and widening of the flood wall rear heel plate; the top plate main bars 51, the bottom plate main bars 52, the top plate reinforcement bars 53 and the second embedded steel bars 54 are cross-connected with each other and then poured with concrete.

[0036] Cement soil mixing piles 6 are arranged; in order to ensure the stability of the roadbed, strengthen the soil in the passive area of ​​the flood control wall and improve the anti-seepage function, 3 to 4 rows of cement soil mixing piles 6 are arranged outside the wall heel, and a layer of anti-seepage geomembrane 8 is laid on the pile top; the cement soil mixing piles 6 have a pile diameter of 400 to 600 mm, a pile length of 4 to 6 m, and are arranged in a square or plum blossom shape with a spacing of 1.0 to 1.3 m; the width of the anti-seepage geomembrane 8 on the pile top is 2 to 4 m.

[0037] The newly built pavement structure 7 is located above the flood wall rear heel plate reinforcement 5 and the cement-soil mixing piles 6. The newly built pavement is generally a non-motorized vehicle lane and a sidewalk. Its pavement structure is graded crushed stone cushion layer, C20 permeable concrete, permeable asphalt concrete or permeable bricks from bottom to top. Permeable asphalt concrete is mainly used as the non-motorized vehicle lane surface layer, and permeable bricks are mainly used as the sidewalk surface layer.

[0038] Because the backfill of the rear abutment in some sections of the road is excavated, the original part of the rear abutment can be transformed into a non-motorized vehicle lane and a sidewalk, thereby widening the width of the road in some sections of the Riverside Road.

[0039] An urban road structure built together with a flood wall and a rear abutment includes an existing flood wall, a flood wall vertical wall reinforcement portion 3, a flood wall rear heel plate 4, a flood wall rear heel plate reinforcement portion 5, cement soil mixing piles 6, and a newly built road surface structure 7.

[0040] The rear heel plate 4 of the flood wall is located at the bottom of the vertical wall of the flood wall, and the existing rear abutment 2 is located on the backwater side of the existing flood wall. In order to meet the road width requirements of the riverside road reconstruction, the fill of the existing rear abutment 2 will be excavated in some sections.

[0041] The flood wall reinforcement part 3 is a slope, close to the flood wall 1, and is constructed of reinforced concrete; the flood wall reinforcement part 3 is located on the back side of the flood wall and is below the design flood level 9.

[0042] The flood wall rear heel plate reinforcement part 5 includes a thickened part of the flood wall rear heel plate 4. The thickened part of the flood wall rear heel plate 4 is located above the flood wall rear heel plate 4. The bottom plate of the thickened part is close to the existing flood wall rear heel plate 4 and connected to the existing flood wall rear heel plate 4. The existing flood wall rear heel plate 4 is thickened by reinforced concrete.

[0043] The flood wall rear heel plate reinforcement part 5 also includes a widened portion of the flood wall rear heel plate 4, that is, the width portion of the existing rear heel plate is widened by reinforced concrete.

[0044] The cement soil mixing pile 6 is arranged outside the wall heel.

[0045] The newly constructed pavement structure 7 is located above the flood wall rear heel plate reinforcement 5 and the cement soil mixing piles 6 .

[0046] Finally, it should be noted that the contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. The above description is only the preferred embodiment of the present invention and is not used to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0047] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "width", "thickness", "upper", "lower", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Claims

1. A method for urban road reconstruction with a flood control wall and a rear abutment, comprising the following steps: If the width of a section of the riverside road in the city is narrow, the fill soil of the back platform next to the narrow section of the road is removed; the existing flood control wall is reinforced; cement soil mixing piles (6) are set up; and a new road surface is built; The flood wall reinforcement includes reinforcement of the flood wall vertical wall (1) and reinforcement of the flood wall rear heel plate (4), and after reinforcement, a flood wall vertical wall reinforcement part (3) and a flood wall thick heel plate reinforcement part (5) are formed; The reinforcement of the flood wall vertical wall (1) is to thicken the wall of the flood wall vertical wall (1) below the design flood level (9) after the backfill of the rear abutment is removed; The urban road structure comprises: a flood wall, a rear abutment, a flood wall vertical wall reinforcement part (3), a flood wall rear heel plate (4), a flood wall rear heel plate reinforcement part (5), a cement soil mixing pile (6), and a newly built road surface structure (7); The flood wall vertical wall reinforcement part (3) is a slope, close to the flood wall vertical wall (1), and the flood wall vertical wall reinforcement part (3) is located on the backwater side of the flood wall and below the design flood level (9); The flood wall rear heel plate reinforcement part (5) comprises a thickened portion of the flood wall rear heel plate (4), the thickened portion of the flood wall rear heel plate is located above the flood wall rear heel plate, and the bottom plate of the thickened portion is adjacent to the existing flood wall rear heel plate (4) and connected to the existing flood wall rear heel plate (4); The flood wall rear heel plate reinforcement portion (5) also includes a widened portion of the flood wall rear heel plate (4); Cement soil mixing piles (6) are arranged outside the wall heel; The newly built road surface structure (7) is located on the flood wall rear heel plate reinforcement part (5) and the cement soil mixing pile (6).

2. The urban road reconstruction method combined with the flood wall and the rear abutment as claimed in claim 1, characterized in that The flood wall vertical wall (1) is reinforced by main reinforcement (31), distribution reinforcement (32), embedded reinforcement (33) and concrete. The main reinforcement (31) is arranged horizontally along the back water surface of the flood wall vertical wall (1), the distribution reinforcement (32) is arranged longitudinally along the back water surface of the flood wall vertical wall (1), and the first embedded reinforcement (33) is embedded in the back water surface of the flood wall vertical wall; the main reinforcement (31), the distribution reinforcement (32) and the first embedded reinforcement (33) are cross-connected with each other and then poured with concrete.

3. The urban road reconstruction method combined with the flood wall and the rear abutment as claimed in claim 1, characterized in that The reinforcement of the rear heel plate (4) of the flood wall comprises thickening the rear heel plate (4) of the flood wall after the backfill of the rear abutment is removed.

4. The urban road reconstruction method combined with the flood wall and the rear abutment as claimed in claim 1, characterized in that The reinforcement of the rear heel plate (4) of the flood wall also includes widening the rear heel plate (4) of the flood wall after the backfill of the rear abutment is removed, and then thickening the rear heel plate (4) of the flood wall on the basis of the widening.

5. The urban road reconstruction method combined with a flood wall and a rear abutment as claimed in claim 1, characterized in that The flood wall rear heel plate reinforcement part (5) comprises a top plate and a bottom plate, wherein the bottom plate is connected to the existing flood wall rear heel plate (4), and the top plate is horizontal; the flood wall rear heel plate (4) is reinforced by top plate main reinforcement (51), top plate distribution reinforcement (53), bottom plate main reinforcement (52), second embedded reinforcement (54) and concrete; the top plate main reinforcement (51) is arranged horizontally above the flood wall rear heel plate (4), and the top plate distribution reinforcement (53) is arranged longitudinally above the flood wall rear heel plate (4); the bottom plate main reinforcement (52) is arranged horizontally on the rear heel plate; the top plate main reinforcement (51), the bottom plate main reinforcement (52), the top plate distribution reinforcement (53) and the second embedded reinforcement (54) are cross-connected with each other and then poured with concrete.

6. The urban road reconstruction method combined with a flood wall and a rear abutment as claimed in claim 1, characterized in that The cement soil mixing piles (6) are arranged in 3-4 rows outside the wall heel, and a layer of anti-seepage geomembrane (8) is laid on the top of the piles. The cement soil mixing piles 6 have a pile diameter of 400-600 mm, a pile length of 4-6 m, and are arranged in a square or plum blossom shape with a spacing of 1.0-1.3 m. The width of the anti-seepage geomembrane 8 on the pile top is 2-4 m.

7. The urban road reconstruction method combined with a flood wall and a rear abutment as claimed in claim 1, characterized in that The newly built road surface is a crushed stone cushion layer, concrete or permeable bricks laid on the rear heel plate reinforcement part of the flood control wall and the cement soil mixing pile.

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