Construction method for rapid widening of embankment longitudinal section lifting section

Abstract

The application provides a kind of roadbed longitudinal section lifting section quick widening construction method, and relates to the technical field of roadbed widening.The roadbed longitudinal section lifting section quick widening construction method comprises dividing the road into construction side, middle strip and keep open side, excavating the road of the construction side until the design elevation, excavating the road of the middle strip, and after excavating to the design elevation, continuing to excavate the space required for the foam light soil armrest, and retaining the original cable pipeline and gravel blind ditch, filling and compacting the excavation range of the middle strip after setting the foam light soil armrest of the middle strip, and pouring cement mortar layer on the top, widening the side of the construction side away from the middle strip, and widening the side of the middle strip and keep open side away from the construction side.The roadbed longitudinal section lifting section quick widening construction method provided by the application solves the technical problems of long construction period and traffic interruption during construction in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of roadbed widening, in particular to a rapid widening construction method for a roadbed longitudinal section lifting section. BACKGROUND

[0002] With the rapid development of the economy and society and the growth of traffic volume, the actual traffic volume of many roads has far exceeded the designed traffic volume, and road reconstruction and expansion projects are imminent tasks.

[0003] The expansion of the road requires the widening of the old road, and the widening of the roadbed longitudinal section lifting section is particularly difficult. The current construction method for the roadbed longitudinal section lifting section is to widen the old road by earthwork filling. This method has a long construction period. If the roadbed longitudinal section is lifted high, it is inevitable to interrupt the traffic during construction, which brings adverse effects on people's travel and regional economic development. SUMMARY

[0004] The purpose of the present application is to provide a rapid widening construction method for a roadbed longitudinal section lifting section to solve the technical problems of long construction period and traffic interruption during construction in the prior art.

[0005] To solve the above technical problems, the technical solution provided by the present application is:

[0006] The rapid widening construction method for a roadbed longitudinal section lifting section provided by the present application comprises:

[0007] Dividing the road into a construction side, a middle strip and a through side, excavating the road on the construction side until the designed elevation;

[0008] Excavating the road on the middle strip and continuing to excavate the space required for the foam light soil arm after excavating to the designed elevation, and retaining the original cable pipeline and gravel blind ditch;

[0009] After setting the foam light soil arm on the middle strip, filling and compacting the excavation range of the middle strip, and pouring a cement mortar layer on the top;

[0010] Widening the side of the construction side away from the middle strip;

[0011] Widening the side of the middle strip and the through side away from the construction side.

[0012] Further,

[0013] When excavating the road on the construction side, first mill the asphalt surface layer, then excavate the base layer, and then excavate the roadbed until the designed elevation.

[0014] Further,

[0015] When the middle strip is constructed, the inclined excavation is performed first, then the vertical excavation is performed, and the excavation is performed to the design elevation.

[0016] Further,

[0017] The foam light soil guard arm comprises a base part and a cap beam.

[0018] The base part is embedded in the old road subgrade, the cap beam is connected with the top of the base part, and a transverse drainage pipe channel is arranged.

[0019] Further,

[0020] When the construction side is widened, the foam light soil is poured in the warehouse.

[0021] Further,

[0022] A pressing top is installed on the top of the foam light soil.

[0023] Further,

[0024] A drainage pipe is installed between the foam light soil and the pressing top, and one end of the drainage pipe extends into the transverse drainage pipe channel.

[0025] Further,

[0026] When the middle strip and the keep-open side are widened, the foam light soil is poured in the warehouse, and a pressing top is installed on the top of the foam light soil.

[0027] Further,

[0028] The middle strip is provided with a gravel layer, and the two sides of the gravel layer are connected with the construction side and the keep-open side after construction, respectively.

[0029] Further,

[0030] The outer periphery of the impermeable geotextile is provided with a waterproof layer.

[0031] Based on the above technical solutions, the technical effects achieved by the present application are analyzed as follows:

[0032] The roadbed longitudinal section lifting section rapid widening construction method provided by the application comprises the following steps: dividing a road into a construction side, a middle strip and a through side, excavating the road on the construction side until a design elevation, excavating the road on the middle strip and continuing to excavate foam light soil arm protection spaces required after excavating to the design elevation, and retaining original cable pipelines and gravel blind trenches, setting the foam light soil arm protection on the middle strip, filling and compacting the excavation range of the middle strip, and pouring a cement mortar layer on the top, widening a side of the construction side away from the middle strip, and widening a side of the middle strip and the through side away from the construction side. When the roadbed longitudinal section lifting section rapid widening construction method is applied, the road is divided into three parts, and two construction sections are constructed, the construction side is first constructed, the through side can be normally used at this time, and the normal travel of people is avoided, the through side and the middle strip are then constructed, the construction side has been constructed and can be normally used at this time, and the normal travel of people is avoided, and thus, the normal travel of people is not affected in the construction process of widening the roadbed. Moreover, the foam light soil arm protection is used in the construction method, the foam light soil arm protection occupies a small space, facilitates construction, and shortens a construction period. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0034] Figure 1 The schematic diagram of step one of the roadbed longitudinal section lifting section rapid widening construction method provided by the embodiment of the present application is shown in the figure.

[0035] Figure 2 The schematic diagram of step two of the roadbed longitudinal section lifting section rapid widening construction method provided by the embodiment of the present application is shown in the figure.

[0036] Figure 3 The schematic diagram of step three of the roadbed longitudinal section lifting section rapid widening construction method provided by the embodiment of the present application is shown in the figure.

[0037] Figure 4 The schematic diagram of step four of the roadbed longitudinal section lifting section rapid widening construction method provided by the embodiment of the present application is shown in the figure.

[0038] Figure 5 The schematic diagram of the middle strip pouring of foam light soil in the roadbed longitudinal section lifting section rapid widening construction method provided by the embodiment of the present application is shown in the figure.

[0039] FIG.:

[0040] 100 - construction side; 110 - foamed lightweight soil; 120 - coping; 130 - drain pipe; 140 - low-dose water-stable crushed stone; 150 - cement-stabilized crushed stone; 160 - asphalt surface; 170 - New Jersey guardrail;

[0041] 200 - middle strip; 210 - foamed lightweight soil guard arm; 211 - base part; 212 - transverse drain pipe passage; 220 - cement mortar layer; 230 - crushed stone layer; 240 - impermeable geotextile;

[0042] 300 - open side;

[0043] 410 - surface layer; 420 - base layer; 430 - subbase. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0045] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0046] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0047] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0048] In addition, the terms "horizontal", "vertical", "overhang" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. As "horizontal" merely means that it is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0049] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0050] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following examples and features in the examples can be combined with each other.

[0051] With the rapid development of economic society and the growth of traffic volume, the actual traffic volume of many roads has far exceeded the designed traffic volume, and road reconstruction and expansion projects are imminent tasks. The expansion of the road requires the old road to be widened, and the widening technology of the roadbed longitudinal section lifting section is particularly difficult. The current construction method of the roadbed longitudinal section lifting section is to use earthwork filling to widen the old road, which has a long construction period. If the roadbed longitudinal section is lifted high, it is inevitable to interrupt the traffic during construction, which has an adverse effect on people's travel and regional economic development.

[0052] Therefore, the roadbed longitudinal section lifting section rapid widening construction method provided by the embodiment of the present application comprises the following steps: dividing a road into a construction side 100, a middle strip 200 and a pass-through side 300, excavating the road of the construction side 100 until a design elevation, excavating the road of the middle strip 200 and continuing to excavate foam light soil arm protection 210 required space downward after excavating to the design elevation, and retaining original cable pipelines and gravel blind trenches, filling and compacting the excavation range of the middle strip 200 after the middle strip 200 is provided with the foam light soil arm protection 210, and pouring a cement mortar layer 220 on the top, widening a side of the construction side 100 away from the middle strip 200, and widening a side of the middle strip 200 and the pass-through side 300 away from the construction side 100. When the roadbed longitudinal section lifting section rapid widening construction method is applied, the road is divided into three parts, and two construction sections are constructed, the construction side 100 is first constructed, at this time, the pass-through side 300 can be normally used and passed through, so as to avoid affecting normal travel of people, then the pass-through side 300 and the middle strip 200 are constructed, at this time, the construction side 100 has been constructed and can be normally used and passed through, so as to avoid affecting normal travel of people, and in this way, during the construction process of widening the roadbed, normal travel of people is not affected. Moreover, the foam light soil arm protection 210 is used in the construction method, the foam light soil arm protection 210 occupies small space, facilitates construction and shortens a construction period.

[0053] In the optional scheme of the embodiment of the present application, when the road of the construction side 100 is excavated, the asphalt surface layer 410 is first milled, then the base layer 420 is excavated, and then the roadbed is excavated until the design elevation.

[0054] Specifically, referring to Figure 1 The method is suitable for the case that the road longitudinal section is lifted by more than 1.2 m, and when the construction side 100 is excavated, the surface layer 410, the base layer 420 and the bottom base layer 430 need to be excavated.

[0055] The road of the construction side 100 is excavated to realize filling and widening of the road of the construction side 100 in the later period.

[0056] In the optional scheme of the embodiment of the present application, when the middle strip 200 is constructed, the middle strip 200 is first obliquely excavated, and then vertically excavated to the design elevation.

[0057] Specifically, referring to Figure 1 and Figure 2 When the middle strip 200 is constructed, the middle strip 200 is first obliquely excavated, and then vertically excavated, and an oblique corner at the top is retained to facilitate filling of soil and form protection of the middle strip 200.

[0058] In an optional solution of the embodiment of the application, the foam light soil guard arm 210 comprises a base part 211 and a cap beam; the base part 211 is embedded in the old road subgrade, the cap beam is connected with the top of the base part 211, and is provided with a transverse drain pipe passage 212.

[0059] Specifically, referring to Figure 2 , the foam light soil guard arm 210 is arranged as a fabricated guard arm.

[0060] The cap beam is connected with the top of the base part 211, and is provided with the transverse drain pipe passage 212, so as to install the drain pipe 130, and facilitate the drainage of the road.

[0061] In an optional solution of the embodiment of the application, when the construction side 100 is widened, referring to Figure 5 , the foam light soil 110 is poured in a sub-bin.

[0062] Specifically, the foam light soil 110 is convenient to construct, light in weight, and self-standing after solidification.

[0063] In an optional solution of the embodiment of the application, the capping 120 is installed on the top of the foam light soil 110.

[0064] Specifically, referring to Figure 3 , the capping 120 is arranged as a foam light soil concrete capping, and above the capping 120 is arranged a low-dose water-stable macadam 140, above the low-dose water-stable macadam 140 is arranged a cement-stable macadam 150, above the cement-stable macadam 150 is arranged an asphalt surface layer 160, and above the asphalt surface layer 160 is arranged a New Jersey guardrail 170.

[0065] The foam light soil concrete capping protects the foam light soil 110.

[0066] In an optional solution of the embodiment of the application, the drain pipe 130 is installed between the foam light soil 110 and the capping 120, and one end of the drain pipe 130 extends into the transverse drain pipe passage 212.

[0067] Specifically, the drain pipe 130 is arranged in a horizontal direction.

[0068] The drain pipe 130 is installed in the transverse drain pipe passage 212, so as to realize the drainage of the sub-zone 200 in the road.

[0069] In an optional solution of the embodiment of the application, when the sub-zone 200 and the keep-open side 300 are widened, the foam light soil 110 is poured in a sub-bin, and the capping 120 is installed on the top of the foam light soil 110.

[0070] Specifically, referring to Figure 4Corresponding to the construction side 100, the traffic maintenance side 300 is provided with a foamed lightweight soil concrete capping, and a low-dose water-stabilized crushed stone 140 is provided above the capping 120, a cement-stabilized crushed stone 150 is provided above the low-dose water-stabilized crushed stone 140, and an asphalt surface layer 160 is provided above the cement-stabilized crushed stone 150.

[0071] Foamed lightweight soil concrete capping protects foamed lightweight soil 110.

[0072] In an optional embodiment of the present invention, the median strip 200 is provided with a crushed stone layer 230, the two sides of the crushed stone layer 230 are connected to the construction side 100 and the post-construction maintenance side 300 respectively, and an impermeable geotextile 240 is provided on the outer periphery of the crushed stone layer 230.

[0073] Specifically, please see Figure 4 The median strip 200mm above is filled with a soil-filled greening layer.

[0074] The impermeable geotextile 240 protects the foamed lightweight soil 110 and the capping 120 on the construction side 100 and the passage-maintaining side 300.

[0075] In an optional embodiment of the present invention, the outer periphery of the impermeable geotextile 240 is provided with a waterproof layer.

[0076] Specifically, the waterproof layer is made of waterproof material and applied to the surface of the foam lightweight soil 110 in contact with the waterproof layer to prevent water from seeping into the foam lightweight soil 110 and the capping 120.

[0077] The following is a detailed explanation of the construction method for rapid widening of the roadbed longitudinal section elevation section:

[0078] a. Construction Step 1: During construction, one half of the road will be open to traffic while the other half will be under construction.

[0079] Please see Figure 1 For the road on the construction side 100, first mill the asphalt surface layer 410, then excavate the base layer 420, and then excavate the roadbed until the design elevation is reached, while simultaneously removing the roadbed protection works.

[0080] When constructing the median strip 200, first excavate diagonally, then excavate vertically. After reaching the design elevation, excavate downwards to create the space required for the foundation of the foam lightweight soil retaining wall 210. During construction, retain the existing median strip 200 cable conduits and gravel drainage ditches.

[0081] b. Construction step two: Install a foam lightweight soil retaining wall 210 on the median strip 200.

[0082] Please see Figure 2The middle strip 200 is provided with a foam light soil guard arm 210, the base part 211 of which is buried below the old road subgrade, and the guard arm remains in the subgrade after the construction is completed. The cap beam above the guard arm is provided with a reserved transverse drainage pipe passage 212. The excavation range of the middle strip 200 is filled and compacted, and a layer of cement mortar 220 is poured above to prevent rainwater infiltration and prevent the foam light soil 110 from being damaged by water.

[0083] c. Construction step three: widening the construction side 100.

[0084] Please refer to Figure 3 The construction side 100 is widened, for example, from four lanes (roadbed width 24m) to eight lanes (roadbed width 42m). The highway has a 2% cross slope. Due to the wide roadbed width after the expansion, the thickness of the foam light soil 110 pressing top 120 at the middle strip 200 is too large. Please refer to Figure 5 To avoid this situation, the roadbed is separated by a formwork at the boundary between the second lane and the third lane, and the foam light soil 110 is poured in separate compartments. The middle surface layer 410 is constructed first, and two New Jersey guardrails 170 are arranged at the position of the middle strip 200. The traffic guide is changed to the half that has been constructed, and the other half is constructed last. When the lifting height is greater than 1.2m, the pipeline of the middle strip 200 is newly arranged above the bottom base layer 430 and temporarily fixed by anchor nails.

[0085] d. Full line operation.

[0086] Please refer to Figure 4 After the construction of the other half is completed, the traffic guide is changed to the half that has been implemented, the asphalt surface layer 160 on the construction side 100 is paved, and the middle strip 200 and the safety facilities are constructed. Finally, the full line is put into operation.

[0087] The blind ditch section of the gravel layer 230 of the middle strip 200 is wrapped with anti-seepage geotextile 240, and the surface of the foam light soil 110 in contact with the gravel blind ditch is coated with waterproof material to prevent water from seeping into the foam light soil 110 and the pressing top 120. The transverse drainage pipe passage 212 is reserved at the top of the middle strip 200 arm during the construction of the foundation to facilitate the transverse drainage of water. The middle strip 200 is implemented in time after the construction of the elevated section of the roadbed and pavement to ensure the drainage quality and effect of the middle strip 200. In order to avoid the thickness of the pressing top 120 at the position of the middle strip 200 being too large to affect the setting of the transverse drainage pipe 130.

[0088] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for quickly widening the elevation section of a roadbed profile, characterized in that, The application relates to a road construction method. The road is divided into a construction side (100), a middle strip (200) and a through side (300), the road of the construction side (100) is excavated until the design elevation; The road of the middle strip (200) is excavated, and the space required for excavating the foam light soil arm (210) is excavated after the road is excavated to the design elevation, and the original cable pipeline and the gravel blind ditch are reserved; The middle strip (200) is provided with the foam light soil arm (210), the excavation range of the middle strip (200) is filled and compacted, and a cement mortar layer (220) is poured on the top; The side of the construction side (100) far from the middle strip (200) is widened; The side of the middle strip (200) and the through side (300) far from the construction side (100) is widened; When the middle strip (200) is constructed, the middle strip (200) is obliquely excavated first, and then vertically excavated until the design elevation; The foam light soil arm (210) comprises a base part (211) and a cap beam; The base part (211) is embedded in the old road bed, the cap beam is connected with the top of the base part (211), and a transverse drainage pipe channel (212) is arranged.

2. The method of claim 1, wherein, When the road of the construction side (100) is excavated, the asphalt surface layer (410) is milled first, then the base layer (420) is excavated, and then the road bed is excavated until the design elevation.

3. The method of claim 1, wherein, When the construction side (100) is widened, the foam light soil (110) is poured in the warehouse.

4. The method of claim 3, wherein, The top of the foam light soil (110) is provided with a pressing top (120).

5. The method of claim 4, wherein, The drainage pipe (130) is arranged between the foam light soil (110) and the pressing top (120), and one end of the drainage pipe (130) extends into the transverse drainage pipe channel (212).

6. The method of claim 1, wherein, When the middle strip (200) and the through side (300) are widened, the foam light soil (110) is poured in the warehouse, and the top of the foam light soil (110) is provided with the pressing top (120).

7. The method of claim 1, wherein, The middle strip (200) is provided with a gravel layer (230), the two sides of the gravel layer (230) are connected with the construction side (100) and the through side (300) after construction respectively, and the outer periphery of the gravel layer (230) is provided with a seepage-proof geotextile (240).

8. The method of claim 7, wherein, The outer periphery of the seepage-proof geotextile (240) is provided with a waterproof layer.

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