CN112695656A - Box culvert construction method for road widening and box culvert - Google Patents
Box culvert construction method for road widening and box culvert Download PDFInfo
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- CN112695656A CN112695656A CN202011602905.8A CN202011602905A CN112695656A CN 112695656 A CN112695656 A CN 112695656A CN 202011602905 A CN202011602905 A CN 202011602905A CN 112695656 A CN112695656 A CN 112695656A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a box culvert construction method and a box culvert for road widening, wherein the method comprises the following steps: calculating additional stress caused by the self weight of the box culvert structure, and excavating a soil layer with a certain thickness downwards when the additional stress is greater than a first preset threshold value; wherein the thickness range is 1-3m, which is most suitable for being used as a road to be widened above the tunnel; filling the two sides of the road to be widened and the outer side of the tunnel, wherein the filling boundary is a stable slope which is downward at an included angle of 30 degrees with the vertical direction and is tangent to the bottom edge of the tunnel; and constructing the box culvert by taking the stable slope and the side slope surface as boundaries. The box culvert construction method for widening the road provided by the invention reduces the roadbed filling load of the newly-built widened road, reduces the additional load of the tunnel structure and the disturbance of the surrounding rock of the tunnel, avoids the deformation cracking and the uneven settlement of the tunnel structure caused by filling construction above the tunnel, and has the advantages of quick construction, strong reliability and good durability.
Description
Technical Field
The invention relates to the technical field of road construction, in particular to a box culvert construction method and a box culvert for road widening.
Background
At present, when a road is widened, common soil is usually adopted for carrying out layered rolling to form a roadbed structure of the road; the engineering is widened to the road above the subway, receives the influence that tunnel structure buried depth and tunnel structure rigidity are less, if widen the fill soil load process of process, probably lead to the tunnel structure below to appear diseases such as uneven settlement or fracture, probably lead to the concrete structure of tunnel structure to fall the piece and gush the great risk of water gushing and sand to take place when serious.
Under the prior art, in order to solve the problem that the earth-filled load is too large in the road widening process implemented above the subway tunnel, the subway tunnel is usually spanned by adopting a cross-line bridge form, the earth-filled load is converted into the dead weight load of a bridge structure, and the dead weight load of the bridge structure is transmitted to the bottom through a pier and a pile foundation, so that the aim of reducing the influence on the tunnel is fulfilled, but the widening method provided by the prior art often has the following defects: if the common soil is adopted for roadbed filling, when the filling height is higher, the additional stress transmitted to the top of the tunnel by the self-weight load of the roadbed can not meet the relevant requirements, and even if the light concrete is adopted, the additional stress borne by the tunnel structure can be too large due to the overhigh filling height, the reliability is not strong, and the durability is poor; if the bridge structure is adopted to cross the subway tunnel, the influence of factors such as deeper buried depth of the tunnel, difficulty in accurate positioning of the tunnel position and the like is caused, when the pile foundation of the bridge structure is implemented, the problems of insufficient perpendicularity of the pile body and inaccurate positioning of pile holes can exist, and the tunnel structure can be broken through or damaged seriously.
Disclosure of Invention
The invention aims to provide a box culvert construction method and a box culvert for widening roads, which reduce roadbed filling load of newly-built widened roads, reduce additional load of a tunnel structure and disturbance of surrounding rocks of the tunnel, avoid deformation cracking and uneven settlement of the tunnel structure caused by filling construction above the tunnel, and have the advantages of quick construction, high reliability and good durability.
In order to overcome the defects in the prior art, the embodiment of the invention provides a box culvert construction method for widening roads, which comprises the following steps:
calculating additional stress caused by the self weight of the box culvert structure, and excavating a soil layer with a certain thickness downwards when the additional stress is greater than a first preset threshold value; to be used as a road to be widened above the tunnel;
filling the two sides of the road to be widened and the outer side of the tunnel, wherein the filling boundary is a stable slope which is downward at an included angle of 30 degrees with the vertical direction and is tangent to the bottom edge of the tunnel;
and constructing the box culvert by taking the stable slope and the side slope surface as boundaries.
Preferably, before the calculating of the additional stress caused by the dead weight of the box culvert structure, the method further comprises the following steps:
acquiring the buried depth and the structure of the tunnel, and acquiring the position of the tunnel structure on the ground according to the side line of the tunnel;
calculating the additional stress of the tunnel structure caused by roadbed filling according to the ground elevation and the designed pavement elevation within the road widening range; and when the additional stress of the tunnel structure caused by roadbed filling is greater than a second preset threshold value, calculating the additional stress caused by the dead weight of the box culvert structure.
Preferably, the height of the roadbed filling is the difference value between the designed road surface elevation and the current road surface elevation.
Preferably, after the constructing the box culvert, the method further comprises:
judging whether the bearing capacity of the box culvert substrate stratum is greater than or equal to a third preset threshold value or not; and if not, taking foundation reinforcement measures until the bearing capacity of the box culvert base stratum is greater than or equal to a third preset threshold value.
Preferably, the road to be widened consists of a reinforced concrete box culvert and bubble mixed light soil.
Preferably, the side slope surface is a slope surface corresponding to a cross section of the box culvert.
Preferably, the soil layer excavated downward by a certain thickness has a thickness ranging from 1 to 3 m.
Preferably, the number and the range of the box culverts constructed are determined according to the buried depth and the structural size of the tunnel.
An embodiment of the present invention further provides a box culvert for widening a road, including:
the device comprises a top plate, a bottom plate, an inclined plate, a vertical plate, a middle partition plate and an antiskid plate;
the top plate is opposite to the bottom plate; the inclined plate is used for connecting the top plate and the bottom plate; the vertical plate is used for sealing a three-dimensional structure formed by the top plate, the bottom plate and the inclined plate, so that the top plate, the bottom plate, the inclined plate and the vertical plate form a closed quadrangular prism;
the middle partition plates are vertically arranged between the top plate and the bottom plate at equal intervals;
the antiskid plate is fixedly connected with the lower surface of the bottom plate, is parallel to the vertical plate and is perpendicular to the middle partition plate.
Preferably, the box culvert is a reinforced concrete box culvert.
Compared with the prior art, the box culvert construction method for widening the road provided by the embodiment of the invention reduces the roadbed filling load of the newly-built widened road, reduces the additional load of the tunnel structure and the disturbance of the surrounding rocks of the tunnel, avoids the deformation cracking and the uneven settlement of the tunnel structure caused by filling construction above the tunnel, and has the advantages of quick construction, high reliability and good durability.
Drawings
Fig. 1 is a schematic flow chart of a box culvert construction method for widening roads according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of the judgment before the box culvert widening construction according to another embodiment of the present invention;
figure 3 is a schematic perspective view of a box culvert provided in accordance with an embodiment of the present invention;
figure 4 is a front view of a box culvert in accordance with one embodiment of the present invention;
FIG. 5 is a longitudinal sectional view of a box culvert in accordance with an embodiment of the present invention;
figure 6 is a cross-sectional view of a box culvert in accordance with one embodiment of the present invention;
fig. 7 is a plan view of a construction culvert and a widened road according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a box culvert construction method for widening roads, including:
s10, calculating additional stress caused by the self weight of the box culvert structure, and excavating a soil layer with a certain thickness downwards when the additional stress is greater than a first preset threshold value; to be used as a road to be widened above the tunnel;
in this step, the additional stress is a stress increase caused by a load in the foundation, and is a factor of causing deformation by destabilization of the foundation. Usually using the Buxinesk theoretical formula. The additional stress in the soil is reduced along with the increase of the depth, the value of the additional stress at the bottom surface of the foundation is equal to that of the substrate, and the stress distribution is started from the position of the substrate; the additional stress distribution in the soil has a stress diffusion phenomenon, and the deeper the soil is, the larger the stress distribution range is, namely the additional stress can be distributed outside the load area range.
In this step, it is first required to calculate whether the additional stress caused by the self-weight of the box culvert structure meets the stress requirement, and the method is to set a stress threshold in advance, that is, a first preset threshold. When the additional stress is larger than a first preset threshold value, a soil layer with a certain thickness is dug downwards on the original road, wherein the thickness is 1-3m most suitable.
It should be noted that, in all cases, the box culvert construction is not directly performed, and before step S10, the method further includes the following steps, as shown in fig. 2:
s01, acquiring the buried depth and the structure of the tunnel, and acquiring the position of the tunnel structure on the ground according to the side line of the tunnel;
in this step, the burial depth refers to the vertical distance from the ground surface to the bottom of the tunnel pipe at the place where the tunnel is buried. In order to protect the buried tunnel from being damaged by ground facilities, vehicles and the like, the top of the pipe is covered with soil of not less than 0.7 m. The river-crossing railway is generally not less than 1.2. In addition to special cases, it is also required to bury the tunnel below the freezing line. In addition to meeting the above conditions, the appropriate burial depth should be determined by a technological economic comparison. In the step, the position of the tunnel structure on the ground can be known according to the burial depth, the structure and the tunnel side line of the tunnel;
s02, calculating the additional stress of the tunnel structure caused by roadbed filling according to the ground elevation and the designed pavement elevation in the road widening range; and when the additional stress of the tunnel structure caused by roadbed filling is greater than a second preset threshold value, calculating the additional stress caused by the dead weight of the box culvert structure.
In this step, it should be noted that roadbed filling refers to: the main components of the road are road surface and road bed, the road bed is the foundation of the road surface, and is formed by digging or filling and compacting on the original ground. The method is divided into a filling roadbed, an excavation roadbed and a semi-filling and semi-excavating roadbed according to the cross section form of the roadbed. The structure composition for filling the roadbed mainly comprises an original foundation, an embankment and a roadbed. In general, roadbed is filled with clay meeting certain technical requirements. The roadbed filling height is the difference value between the designed pavement elevation and the current pavement elevation.
Similar to the step S10, when the roadbed is filled, additional stress may be caused, and at this time, a second determination should be performed to determine whether the additional stress of the tunnel structure caused by the roadbed filling is greater than a second preset threshold, if so, the road surface needs to be widened through the construction culvert, and then the step S10 is performed.
S20, filling the two sides of the road to be widened and the outer side of the tunnel, wherein the filling boundary is a stable slope which forms a downward included angle of 30 degrees with the vertical direction and is tangent to the bottom edge of the tunnel;
further, the road to be widened is composed of box culverts and bubble mixed light soil, wherein the bubble mixed light soil is formed by fully foaming a foaming agent in a mechanical mode through a foaming system of a foaming machine, uniformly mixing the foam with cement slurry, then carrying out cast-in-place construction or mould forming through a pumping system of the foaming machine, and forming the novel light roadbed filling material containing a large number of closed air holes through natural curing. The main characteristics of the method include:
1) and (3) light weight: the dry bulk density is 300-1600KG/M3, which is equivalent to about 1/5-1/8 of common cement concrete, and can reduce the whole load of the building.
2) Integrity: can be cast and constructed on site, is tightly combined with the main body, and does not need to leave a boundary gap and a ventilation pipe.
3) Low-elasticity shock-absorbing property: the porosity of the air-bubble mixed light soil makes it have a low elastic modulus, thereby making it have good absorption and dispersion effects on impact loads.
4) Pressure resistance: the compressive strength is 0.6-25.0 MPA.
5) Water resistance: the cast-in-place air bubble mixed light soil has small water absorption, relatively independent closed air bubbles and good integrity, so that the cast-in-place air bubble mixed light soil has certain waterproof performance.
6) Durability: the service life of the main engineering is the same.
7) The construction speed is fast: the automatic operation can be realized by using a simple machine, the long-distance conveying of 800 meters can be realized, and the workload is 150-300M 3/workday.
8) Environmental protection property: the raw materials required by the bubble mixed light soil are cement and a foaming agent, the foaming agent is neutral and does not contain harmful substances such as benzene, formaldehyde and the like, thereby avoiding environmental pollution and fire-fighting hidden danger.
9) The economic efficiency is as follows: the comprehensive cost is low.
Furthermore, it should be added that before the formation of the stabilizing slope, the treatment of the surface layer of the foundation on the stabilizing slope is required and the following requirements are met:
the transverse slope of the ground is slowed to 1: at 10 hours, the embankment can be directly filled on the natural ground. But in sections where the height of the embankment is less than the thickness of the bed, the surface turf should be removed.
The ground cross slope is 1: 10-1: at 5, the turf should be removed.
And thirdly, the ground cross slope is 1: 5-1: 2.5, digging steps on the original ground, wherein the width of the steps is not less than 1 m. When the overburden on the bedrock surface is thin, the overburden is preferably removed first and then the step is dug. When the covering layer is thick and stable, the covering layer can be reserved, namely, the embankment is filled after the step is dug on the original ground, and the step is dug from bottom to top along with excavation and filling so as to keep the step sill stable. The ground transverse slope is steeper than 1: the 2.5-section steep slope embankment needs to check the stability of the whole embankment sliding along the basement and the weak layer under the basement, and the safety coefficient of the anti-sliding stability is not less than 1.25. Otherwise, anti-skid measures such as improving the base condition or arranging a supporting and blocking structure should be taken. Drainage equipment is arranged on the side, close to the mountain, of the steep slope embankment, and anti-seepage reinforcement measures are adopted.
When the basement has groundwater to influence the stability of the embankment, measures such as interception and drainage beyond the range of the basement or filling of water seepage fillers at the bottom of the embankment are adopted.
When the surface layer of the foundation is a loose soil layer and the natural density of the surface layer is less than the specified value of the upper surface, if the thickness of the loosened soil is not more than 0.3m, the surface of the original site is compacted; if the thickness of the loosened soil is more than 0.3m, the loosened soil should be dug, backfilled and compacted in layers or other foundation reinforcing measures should be taken, and the density after rolling should meet the regulations in the following table.
When the surface layer of the foundation is a soft soil layer and the value of the standard penetration hammering number N of the foundation is less than 4 or the penetration resistance Pi of the static sounding ratio is less than 1MPa, foundation reinforcing measures such as drainage and drainage, dredging and replacing filling, and throwing and filling rubbles or sand and gravel are adopted according to the property, the thickness, the water content, the surface water depth and the like of the soft soil layer.
And forming a stable regular triangle by the contact surface of the stable slope and the roof of the box culvert, and filling the two sides of the road to be widened and the outer side of the tunnel by taking the slope boundary as a reference until the filling is finished.
And S30, constructing the box culvert by taking the stable slope and the side slope as boundaries.
Wherein, the side slope surface is a slope surface corresponding to the cross section of the box culvert; further, the number and the range of the constructed box culverts are determined according to the buried depth and the structural size of the tunnel.
After the step, judging the third force, namely judging whether the bearing capacity of the box culvert substrate stratum is greater than or equal to a third preset threshold value; if not, taking foundation reinforcement measures until the bearing capacity of the box culvert base stratum is greater than or equal to a third preset threshold value, namely meeting the bearing capacity requirement.
The box culvert construction method for widening the road provided by the embodiment of the invention reduces the roadbed filling load of the newly-built widened road, reduces the additional load of the tunnel structure and the disturbance of the surrounding rocks of the tunnel, avoids the deformation cracking and the uneven settlement of the tunnel structure caused by filling construction above the tunnel, and has the advantages of quick construction, strong reliability and good durability.
Referring to fig. 3-6, in an exemplary embodiment, a box culvert 2 used in the construction of the present invention is further provided, fig. 3 is a perspective structural view of the box culvert, and fig. 4 is a front view of the box culvert structure; fig. 5 and 6 are a longitudinal sectional view and a cross sectional view of a box culvert in construction according to an embodiment of the present invention; the box culvert 2 includes: the device comprises a top plate 21, a bottom plate 22, an inclined plate 23, a vertical plate 24, a middle partition plate 25 and an antiskid plate 26;
the top plate 21 is opposite to the bottom plate 22 to form the upper surface and the lower surface of the prism, and the top plate 21 and the bottom plate 22 are both rectangular; the inclined plates 23 comprise two inclined plates which are respectively used for connecting the top plate 21 and the bottom plate 22 to form the left surface and the right surface of the prism, and the two inclined plates 23 are rectangular; the vertical plates 24 comprise two vertical plates which are respectively used for sealing a three-dimensional structure formed by enclosing the top plate 21, the bottom plate 22 and the inclined plate 23 to form the front and back surfaces of a prism, the two vertical plates 24 are trapezoidal, the middle partition plates 25 are vertically arranged between the top plate 21 and the bottom plate 22 at equal intervals, and the number of the middle partition plates can be adjusted according to actual needs; the anti-skid plate 26 is arranged below the bottom plate 22, is parallel to the vertical plate 24 and is perpendicular to the middle partition plate 25.
Further, the thickness of the top plate 21 ranges from 300 mm to 500 mm; the thickness of the bottom plate 22 ranges from 300 mm to 500 mm; the number of the middle partition plates 25 is determined according to the load of the road vehicles; the cleat 26 is comprised of at least two pieces and is symmetrical with respect to the central axis of the base plate.
Furthermore, the box culvert is a reinforced concrete box culvert, wherein the material properties of the reinforced concrete are determined by the common work of the reinforced concrete. Firstly, the reinforcing steel bars and the concrete have approximately the same linear expansion coefficient, and excessive stress cannot be generated due to different environments. Secondly, there is good adhesion between the reinforcement and the concrete, and sometimes the surface of the reinforcement is also machined with spaced ribs (called deformed bars) to improve the mechanical engagement between the concrete and the reinforcement, and when this is still insufficient to transmit the tensile forces between the reinforcement and the concrete, the ends of the reinforcement are typically hooked 180 degrees. In addition, the alkaline environment provided by calcium hydroxide in the concrete forms a layer of passivation protective film on the surface of the steel bar, so that the steel bar is less prone to corrosion compared with the neutral and acidic environments.
Referring to fig. 7, in an exemplary embodiment, a plan view of a construction culvert and a widened road in accordance with the present invention is also provided. Wherein, original road 1 is located subway tunnel 3's top, and tunnel 3 comprises 1 or many tunnels, widens road 4 and is located original road 1's the outside to be located subway tunnel 3's top.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A box culvert construction method for road widening is characterized by comprising the following steps:
calculating additional stress caused by the self weight of the box culvert structure, and excavating a soil layer with a certain thickness downwards when the additional stress is greater than a first preset threshold value; to be used as a road to be widened above the tunnel;
filling the two sides of the road to be widened and the outer side of the tunnel, wherein the filling boundary is a stable slope which is downward at an included angle of 30 degrees with the vertical direction and is tangent to the bottom edge of the tunnel;
and constructing the box culvert by taking the stable slope and the side slope surface as boundaries.
2. The box culvert construction method for widening roads according to claim 1, further comprising, before the calculating of additional stress caused by self weight of the box culvert structure:
acquiring the buried depth and the structure of the tunnel, and acquiring the position of the tunnel structure on the ground according to the side line of the tunnel;
calculating the additional stress of the tunnel structure caused by roadbed filling according to the ground elevation and the designed pavement elevation within the road widening range; and when the additional stress of the tunnel structure caused by roadbed filling is greater than a second preset threshold value, calculating the additional stress caused by the dead weight of the box culvert structure.
3. The box culvert construction method for widening roads according to claim 2, wherein the height of the roadbed filling is a difference between a design road surface elevation and a current road surface elevation.
4. The box culvert construction method for widening roads according to claim 1, further comprising, after said constructing the box culvert:
judging whether the bearing capacity of the box culvert substrate stratum is greater than or equal to a third preset threshold value or not; and if not, taking foundation reinforcement measures until the bearing capacity of the box culvert base stratum is greater than or equal to a third preset threshold value.
5. The box culvert construction method for widening roads according to claim 1, wherein the road to be widened is composed of a reinforced concrete box culvert and bubble mixed light soil.
6. The box culvert construction method for widening roads of claim 1, wherein the edge slope surface is a slope surface corresponding to a cross section of the box culvert.
7. The box culvert construction method for widening roads according to claim 1, wherein the soil layer excavated downwards with a certain thickness has a thickness ranging from 1 to 3 m.
8. The box culvert construction method for widening roads according to claim 1, wherein the number and range of constructing the box culverts are determined according to the burial depth and the structural size of the tunnel.
9. A box culvert for widening roads, comprising:
the device comprises a top plate, a bottom plate, an inclined plate, a vertical plate, a middle partition plate and an antiskid plate;
the top plate is opposite to the bottom plate; the inclined plate is used for connecting the top plate and the bottom plate; the vertical plate is used for sealing a three-dimensional structure formed by the top plate, the bottom plate and the inclined plate, so that the top plate, the bottom plate, the inclined plate and the vertical plate form a closed quadrangular prism;
the middle partition plates are vertically arranged between the top plate and the bottom plate at equal intervals;
the antiskid plate is fixedly connected with the lower surface of the bottom plate, is parallel to the vertical plate and is perpendicular to the middle partition plate.
10. A box culvert for widening roads according to claim 9, characterized in that said box culvert is a reinforced concrete box culvert.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115387188A (en) * | 2022-09-19 | 2022-11-25 | 杭州禹航建设工程有限公司 | Road widening formwork structure and construction method applying same |
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