CN108678000B - U-shaped retaining structure for roadbed underpass highway and construction method thereof - Google Patents
U-shaped retaining structure for roadbed underpass highway and construction method thereof Download PDFInfo
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- E02D29/00—Independent underground or underwater structures; Retaining walls
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Abstract
The invention discloses a U-shaped retaining structure of a roadbed underpass highway and a construction method thereof, wherein the U-shaped retaining structure is a U-shaped groove and is poured by reinforced concrete; the construction method comprises the steps of pipeline moving and modifying, hard isolation and enclosure, guard pile and crown beam construction, cutting excavation, cushion layer and waterproof layer construction, bottom plate construction, side wall construction, structural waterproof construction and wall body two-side backfilling. The construction method of the invention ensures that the existing highway foundation is not influenced by construction, ensures the operation of the highway, solves the possible influence of roadbed excavation on the existing bridge pile foundation, ensures the construction safety and has obvious economic and social benefits.
Description
Technical Field
The invention relates to a U-shaped retaining structure of a roadbed underpass highway and a construction method thereof.
Background
With the rapid development of high-speed railways in China, the phenomenon that a newly-built railway passes through an operated high-speed bridge is increased, and the existing bridge foundation and the surrounding geological environment are easily disturbed. For example, a newly-built Beijing-ZSG-6 standard section of a Zhang Jiakou railway is located in Huaiyuan county, and the origin-destination mileage is DK106+ 907.95-DK 132+ 250. The standard passes through a Jing new high-speed road under the DK109+ 530-DK 109+610 sections, the intersection angle is 48 degrees, and the standard is parallel to the existing Jing packet railway; the clear distance between the original ground and the bottom of the existing bridge is 4.2 m.
The construction method is necessary for ensuring that the existing highway foundation is not influenced by construction, ensuring highway operation, solving the possible influence of roadbed excavation on the existing bridge pile foundation and ensuring construction safety, and is suitable for the closed type cutting U-shaped supporting and retaining structure in roadbed supporting and retaining engineering of railways, subways and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a U-shaped retaining structure for a road penetrating through a roadbed and a construction method thereof aiming at the defects in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a U-shaped retaining structure of a roadbed underpass highway is characterized in that the U-shaped retaining structure is a U-shaped groove and is poured by reinforced concrete; the bottom of the U-shaped groove is provided with a gravel cushion layer and a concrete cushion layer, a self-adhesive waterproof coiled material is paved on the U-shaped groove, and a fine stone concrete protective layer is paved on the waterproof coiled material; the U type groove side is equipped with the whole package of self-adhesive waterproofing membrane and is waterproof, the settlement joint and the construction joint department in U type groove are equipped with the well formula waterstop of burying, the upstream face in U type groove still is equipped with the self-adhesive waterproofing membrane enhancement layer.
The U-shaped retaining structure for the roadbed underpass road comprises 8U-shaped grooves, wherein each U-shaped groove is 10m in length, 13.8m in width, 80cm in bottom plate thickness, 80cm in side wall width and 7.2m in side wall height.
According to the U-shaped retaining structure for the roadbed underpass highway, reinforced concrete fender piles are arranged on two sides of each U-shaped groove; the length of the fender post is 16m, and the top of the fender post is a reinforced concrete beam of 1.2m multiplied by 1.6 m.
A construction method of a U-shaped retaining structure of a road penetrating through a roadbed comprises the following steps:
(1) pipeline moving and modifying: manually digging a detection ditch to determine the position and the path of a pipeline according to the pipeline arrangement condition in the roadbed construction range, and then moving and modifying the pipeline;
(2) hard isolation and enclosure: before construction, arranging a hard isolation fence on an existing cutting to isolate a construction site from an existing line, wherein the fence is made of a steel wire mesh with the height of 1.8 m, upright columns are steel pipes with the diameter of 48mm, the distance between the upright columns is 3.0m, and the buried depth is 40 cm;
(3) and (3) construction of fender piles and crown beams: the fender pile adopts a manual hole digging and filling pile construction process, adopts jump pile digging and construction in multiple times, and adjacent piles cannot be constructed simultaneously; the process flow of the manual hole digging cast-in-place pile comprises the following steps: leveling the field → positioning the measuring and positioning the pile → excavating the pile hole → erecting the retaining wall template → carrying out concrete construction of the retaining wall → repeatedly excavating and constructing the retaining wall according to the required height of each retaining wall until the designed pile bottom elevation → manufacturing and hoisting of the steel reinforcement cage in place → pouring of concrete of the pile foundation.
(4) Cutting excavation: before cutting excavation, arranging a water intercepting ditch at the top of a slope; the cutting excavation is carried out from a small mileage to a large mileage, and is carried out from top to bottom in a transverse full-width layered mode, wherein each layer is 1 m; excavating to a soil layer 30cm above the elevation of the designed substrate, stopping mechanical excavation, and cleaning the bottom by matching with manpower;
(5) constructing a cushion layer and a waterproof layer: paving a 30cm gravel cushion layer on the base, pouring a C25 concrete cushion layer with the thickness of 20cm on two sides by using channel steel as side molds, covering geotextile after pouring, and watering for maintenance; directly paving the waterproof coiled material on the surface of the base layer, removing the isolating membrane of the coiled material after paving, and immediately pouring a C30 fine-stone concrete protective layer with the thickness of 5 cm;
(6) bottom plate construction: the bottom plate of the U-shaped groove is constructed in sections according to the position of the settlement joint, the bottom plate adopts a steel template and is poured by reinforced concrete, and the free-falling height during pouring is not more than 2 m; the buried water stop belt at the settlement joint is fixed by a special steel bar sleeve or flat steel, the water stop belt is installed in a disc shape, and the included angle between two wings and the horizontal direction is controlled between 15 and 20 degrees;
(7) side wall construction: the side wall of the U-shaped groove adopts a combined steel mould, sponge strips are clamped at the joints of the templates to prevent slurry leakage, and dislocation at the joints of the templates is not more than 2 mm; when the side wall template is supported, the bottom foot is added with sweeping square timber, and the two sides are provided with split bolts, horizontal braces and inclined braces; arranging split bolts every 80cm in a quincunx manner, and adopting square wood back ridges of 15cm multiplied by 15 cm; the PVC pipe is sleeved outside the bolt, so that the split bolt can be smoothly disassembled when the mold is disassembled; when the template is supported, inner supports with the same width as the wall body are arranged on the inner side of the template at intervals and are arranged in a quincunx shape;
the side wall formwork concrete pouring is carried out in a layered mode, during layered pouring, the upper layer concrete pouring is completed before the lower layer concrete is initially set or can be remolded, each layer of vibration is carried out in a circle by circle mode according to the sequence of firstly carrying out center and then carrying out periphery, the vibrating rod is vertically inserted, quickly inserted and slowly pulled, the vibrating rod is inserted along the inner ring of the steel bar during periphery concrete vibration, and the distance between the vibrating rod and the side formwork is kept to be 50-100 mm;
(8) and (3) structural waterproof construction: the U-shaped groove structure adopts self-adhesive coiled material full-wrapping waterproof, and special parts such as internal and external corners are made into self-adhesive waterproof coiled material reinforced layers; after the side wall and the cantilever plate coiled material are laid, the outer side is protected by a plastic foam plate;
the expansion joint is embedded by a hard plastic foam board and a polystyrene foam plastic board, two ends of the expansion joint are sealed by polyurethane sealant, the expansion joint is waterproof by a middle-buried water stop, and the outer side of the side wall is waterproof by a back-attached water stop; a construction joint is arranged at the position of the side wall body of the U-shaped groove, which is 30cm away from the bottom plate, and the construction joint adopts a middle-buried water stop belt for water prevention;
(9) backfilling two sides of the wall body: backfilling with C15 concrete; when backfilling, two sides are symmetrically performed, and vibration is enhanced in the process.
According to the construction method of the U-shaped retaining structure of the roadbed underpass road, covering, watering and maintaining are carried out after concrete is poured for 14 hours, and the maintaining time is not less than 14 days.
The invention has the beneficial effects that:
(1) the construction method provides a new reinforcing form for the railway roadbed retaining engineering, and solves the problem that the influence of roadbed excavation on the existing bridge pile foundation is possible.
(2) The construction method has clear process flow, convenient operation, safe construction and easy control.
(3) The construction method provides valuable experience for the safe construction of the existing expressway under the railway industry, and has remarkable economic and social benefits.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:
FIG. 1 is a process flow diagram of the construction method of the present invention.
FIG. 2 is a plan view of a high-speed construction of an existing Jingxin floor under the floor of embodiment 1 of the invention.
Fig. 3 is a schematic cross-sectional view of a U-shaped groove in embodiment 1 of the present invention.
FIG. 4 is a schematic view of a hard isolation enclosure in embodiment 1 of the present invention.
FIG. 5 is a schematic view of a U-shaped waterproof section according to embodiment 1 of the present invention.
Fig. 6 is a schematic view of a waterproof structure of a side wall construction joint in embodiment 1 of the present invention.
FIG. 7 is a schematic view of a waterproof structure of a deformation joint of a side wall in embodiment 1 of the present invention.
In the figure: 1-steel wire mesh, 2-upright posts, 3-construction joints, 4-cushion layers, 5-waterproof layers, 6-bottom plates, 7-self-adhesive waterproof coiled materials, 8-self-adhesive waterproof coiled material reinforcing layers, 9-cement-based permeable crystalline coatings, 10-lower-layer concrete, 11-buried water stops, 12-upper-layer concrete, 13-back-attached water stops and 14-caulking materials.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in the embodiment 1, a JZSG-6 standard section of a Beijing-Zhizhongkou railway is newly established, a Beijing new high-speed road is penetrated under a DK109+ 530-DK 109+610 section, the traffic angle is 48 degrees, and the method is parallel to the existing Beijing covered railway; the clear distance between the original ground and the bottom of the existing bridge is 4.2 m. The construction method of the invention is applied by taking the mark section as an example.
A U-shaped retaining structure of a roadbed underpass highway is characterized in that the U-shaped retaining structure is a U-shaped groove and is cast by C35 reinforced concrete; the bottom of the U-shaped groove is provided with a 30cm gravel cushion layer and a 20cm thick C25 concrete cushion layer, a self-adhesive waterproof coiled material is paved on the U-shaped groove, and a 5cm thick C30 fine gravel concrete protective layer is paved on the waterproof coiled material; u type groove side is equipped with 7 full package waterproofings of self-adhesive waterproofing membrane, the settlement joint and the construction joint department in U type groove are equipped with the formula waterstop 11 of burying, the upstream face in U type groove still is equipped with self-adhesive waterproofing membrane enhancement layer 8.
The U-shaped grooves are 8 sections in total, each section is 10m, the width is 13.8m, the thickness of the bottom plate is 80cm, the width of the side wall is 80cm, and the height of the side wall is 7.2 m. The two sides of the U-shaped groove are provided with reinforced concrete fender posts with the diameter of 1.2 m; the length of the fender pile is 16m, the pile top is a reinforced concrete beam of 1.2m multiplied by 1.6m, and the fender pile protects the Beijing new high-speed bridge pier and the foundation pit.
A construction method of a U-shaped retaining structure of a road passing through a roadbed comprises the following steps as shown in figure 1:
(1) pipeline moving and modifying: manually digging a detection ditch to determine the position and the path of a pipeline according to the pipeline arrangement condition in the roadbed construction range, and then moving and modifying the pipeline;
(2) hard isolation and enclosure: before construction, arranging a hard isolation fence on an existing cutting to isolate a construction site from an existing line, wherein the fence is made of a steel wire mesh 1 with the height of 1.8 m, upright columns 2 are steel pipes with the diameter of 48mm, the distance between the upright columns is 3.0m, and the buried depth is 40 cm;
(3) and (3) construction of fender piles and crown beams: the fender pile adopts a manual hole digging and filling pile construction process, adopts jump pile digging and construction in multiple times, and adjacent piles cannot be constructed simultaneously; the process flow of the manual hole digging cast-in-place pile comprises the following steps: leveling the field → positioning the measuring and positioning the pile → excavating pile hole (1 m depth) → erecting a retaining wall template → carrying out concrete construction of the retaining wall → repeatedly excavating according to the required height of each retaining wall and constructing the retaining wall until the designed pile bottom elevation → manufacturing a steel reinforcement cage, hoisting in place → pouring concrete of the pile foundation.
The manual hole digging and filling pile is carried out layer by layer from top to bottom by using picks and shovels, and the soil digging sequence is that the middle part is dug first and then the periphery is dug. And one section is formed when the excavation depth is 1.0m, and the concrete retaining wall is constructed as soon as possible after each section is excavated.
The steel reinforcement cage is installed in sections, and the joint welding adopts single-side welding. The concrete pouring adopts a series of tube conduits to pour, and a vibrating rod is inserted into the pile top within 2m for vibrating.
And (3) chiseling partial concrete of the pile top super-poured during the construction of the crown beam, simultaneously cleaning residues, floating soil and accumulated water on the pile top, and performing chiseling treatment. Binding the steel bars of the top beam, paying attention to the fact that the vertical main bars of the pile body penetrate into the anchoring length of the top beam in construction, anchoring according to the designed length, erecting a template, and adopting a combined steel template. After the concrete is conveyed to a pouring position by a mixing and transporting vehicle, the concrete is manually fed into a mold, and a tamping drum of an insertion type vibrator is compact.
(4) Cutting excavation: before cutting excavation, a water intercepting ditch is arranged at the top of a slope, so that surface water is prevented from flowing into a foundation pit and scouring the top of the enclosure structure; the cutting excavation is carried out from a small mileage to a large mileage, and is carried out from top to bottom in a transverse full-width layered mode, wherein each layer is 1 m; excavating to a soil layer 30cm above the elevation of the designed substrate, stopping mechanical excavation, and cleaning the bottom by matching with manpower;
(5) constructing a cushion layer 4 and a waterproof layer 5: paving a 30cm gravel cushion layer on the base, pouring a C25 concrete cushion layer with the thickness of 20cm on two sides by using channel steel as side molds, covering geotextile after pouring, and watering for maintenance; directly paving the waterproof coiled material on the surface of the base layer, removing the isolating membrane of the coiled material after paving, and immediately pouring a C30 fine-stone concrete protective layer with the thickness of 5 cm;
(6) and (3) constructing a bottom plate 6: the bottom plate 6 of the U-shaped groove is constructed in sections according to the position of the settlement joint, the bottom plate 6 adopts a steel template and is poured by reinforced concrete, and the free-falling height during pouring is not more than 2 m; the buried water stop belt at the settlement joint is fixed by a special steel bar sleeve or flat steel, the water stop belt is installed in a disc shape, and the included angle between two wings and the horizontal direction is controlled between 15 and 20 degrees;
(7) side wall construction: the side wall of the U-shaped groove adopts a combined steel mould, and the area of a single template block is more than 1.0m2Sponge strips are clamped at joints of the templates to prevent slurry leakage, and dislocation at the joints of the templates is not more than 2 mm; when the side wall template is supported, the bottom foot is added with sweeping square timber, and the two sides are provided with split bolts, horizontal braces and inclined braces; one split bolt is arranged every 80cm and is arranged in a quincunx shape, and a 15cm multiplied by 15cm square wood back edge is adopted(ii) a The PVC pipe is sleeved outside the bolt, so that the split bolt can be smoothly disassembled when the mold is disassembled; when the template is supported, the inner side of the template is provided with inner supports with the same width as the wall body, the setting interval of the inner supports is 1.5m, and the inner supports are arranged in a quincunx shape; the inner support is made of steel bars with the diameter of 16mm, and is pulled out along with the pouring of concrete until the lower-section side wall is continuously used; after the template is installed, the plane position, the top elevation, the node connection and the longitudinal and transverse stability of the template are checked. Removing all impurities on the surface of the template before pouring concrete;
before the side wall formwork is cast with concrete, a layer of high-quality cement-based permeable crystalline coating 9 is firstly smeared at the bottom of the inner side of the formwork, gaps among the formworks are sealed by double faced adhesive tape paper, and split bolts are screwed tightly to prevent slurry leakage; the side wall formwork concrete pouring is carried out in a layered mode, the thickness of each layer is about 30-40 cm, when the layers are poured, the pouring of the upper layer concrete 12 is completed before the lower layer concrete 10 is initially set or can be remolded, so that the plug-in vibrator is enabled to deeply penetrate into the lower layer (5-10 cm) for vibration, and the layer surfaces are bonded into a whole; vibrating each layer in turn according to the sequence of the center and the periphery, vertically inserting a vibrating rod, quickly inserting and slowly pulling, wherein the vibration duration time of each insertion is kept at about 20s, the vibrating rod is inserted along the inner ring of the steel bar when the peripheral concrete is vibrated, and the distance between the vibrating rod and the side mold is kept at 50-100 mm; and (5) after the concrete is poured for 14 hours, covering, watering and curing, wherein the curing time is not less than 14 days.
(8) And (3) structural waterproof construction: the U-shaped groove structure adopts a self-adhesive waterproof coiled material 7 to be completely wrapped waterproof, and special parts such as internal and external corners and the like are made into a self-adhesive waterproof coiled material reinforcing layer 8; after the side wall and the cantilever plate coiled material are laid, the outer side is protected by a plastic foam plate;
an expansion joint is arranged at each 9.98 m of the main structure of the U-shaped groove along the longitudinal direction, and the width of the expansion joint is 2 cm; the expansion joint is embedded by a hard plastic foam plate and a polystyrene foam plastic plate, two ends of the expansion joint are sealed by polyurethane sealant with the thickness of 20mm, the expansion joint is waterproof by a buried water stop belt, and the outer side of the side wall is waterproof by a back-attached water stop belt 13; a construction joint is arranged at the position of the side wall body of the U-shaped groove, which is 30cm away from the bottom plate, and the construction joint adopts a middle-buried water stop belt for water prevention; when the bottom plate structure is constructed, firstly compacting concrete on the lower side of the water stop, compacting the water stop to the surface of the water stop, and then continuously pouring concrete; symmetrically pouring on two sides of the water stop belt during side wall construction;
(9) backfilling two sides of the wall body: carrying out backfilling operation after the strength of the wall body meets the design requirement, and backfilling by adopting C15 concrete; when backfilling, two sides are symmetrically performed, and vibration is enhanced in the process.
The process principle of the construction method of the invention is as follows: the U-shaped groove is used as a supporting structure, when the cutting passes through a narrow area and buildings around the cutting cannot be dismantled, the side pressure of the surrounding soil body is resisted by using the strength and rigidity of the side wall, and the uplifting pressure of underground water is resisted by using the self weight of the side wall, the bottom plate and the self weight of the attached facilities, so that the stability of the structure is maintained, and the purpose of ensuring the safe operation of the railway is achieved.
The invention utilizes the construction of the U-shaped groove, can pass through the underpass reserved between two piers of the constructed highway, solves the problems that the construction space is insufficient, the excavation area with higher underground water level and limited precipitation, drainage or slope releasing conditions cannot be constructed, avoids the arrangement of an elevated bridge and reduces the roadbed filling height. Compared with an upper span bridge, the construction of the U-shaped groove has obvious economic benefit no matter the bracket is cast in place, cast in cantilever or prefabricated and erected.
The highway is crossed by the high-speed railway in a downward-crossing mode, and has the advantages of small risk, short construction period, small occupied area, low manufacturing cost and small influence on the operation of the existing highway. The construction process provided by the invention can promote the development of the whole railway transportation industry better and more economically, and has good social benefit.
It should be noted that the specific embodiments are merely representative examples of the present invention, and it is obvious that the technical solution of the present invention is not limited to the above-mentioned examples, and many variations are possible. Those skilled in the art, having the benefit of this disclosure and the benefit of this written description, will appreciate that other embodiments can be devised which do not depart from the specific details disclosed herein.
Claims (4)
1. A construction method of a U-shaped retaining structure of a roadbed underpass highway is characterized in that the U-shaped retaining structure is a U-shaped groove and is poured by adopting reinforced concrete; the bottom of the U-shaped groove is provided with a gravel cushion layer and a concrete cushion layer, a self-adhesive waterproof coiled material is paved on the U-shaped groove, and a fine stone concrete protective layer is paved on the waterproof coiled material; the side surface of the U-shaped groove is provided with a self-adhesive waterproof coiled material full-wrapping waterproof layer, a buried water stop is arranged at a settlement joint and a construction joint of the U-shaped groove, and the upstream surface of the U-shaped groove is also provided with a self-adhesive waterproof coiled material reinforcing layer; the method comprises the following steps:
(1) pipeline moving and modifying: manually digging a detection ditch to determine the position and the path of a pipeline according to the pipeline arrangement condition in the roadbed construction range, and then moving and modifying the pipeline;
(2) hard isolation and enclosure: before construction, arranging a hard isolation fence on an existing cutting to isolate a construction site from an existing line, wherein the fence is made of a steel wire mesh with the height of 1.8 m, upright columns are steel pipes with the diameter of 48mm, the distance between the upright columns is 3.0m, and the buried depth is 40 cm;
(3) and (3) construction of fender piles and crown beams: the fender pile adopts a manual hole digging and filling pile construction process, adopts jump pile digging and construction in multiple times, and adjacent piles cannot be constructed simultaneously; the process flow of the manual hole digging cast-in-place pile comprises the following steps: leveling a field → positioning a measuring and positioning pile → excavating a pile hole → erecting a retaining wall template → carrying out concrete construction of the retaining wall → repeatedly excavating according to the required height of each retaining wall and constructing the retaining wall until the designed pile bottom elevation → manufacturing of a steel reinforcement cage, in-place hoisting → concrete pouring of a pile foundation;
(4) cutting excavation: before cutting excavation, arranging a water intercepting ditch at the top of a slope; the cutting excavation is carried out from a small mileage to a large mileage, and is carried out from top to bottom in a transverse full-width layered mode, wherein each layer is 1 m; excavating to a soil layer 30cm above the elevation of the designed substrate, stopping mechanical excavation, and cleaning the bottom by matching with manpower;
(5) constructing a cushion layer and a waterproof layer: paving a 30cm gravel cushion layer on the base, pouring a C25 concrete cushion layer with the thickness of 20cm on two sides by using channel steel as side molds, covering geotextile after pouring, and watering for maintenance; directly paving the waterproof coiled material on the surface of the base layer, removing the isolating membrane of the coiled material after paving, and immediately pouring a C30 fine-stone concrete protective layer with the thickness of 5 cm;
(6) bottom plate construction: the bottom plate of the U-shaped groove is constructed in sections according to the position of the settlement joint, the bottom plate adopts a steel template and is poured by reinforced concrete, and the free-falling height during pouring is not more than 2 m; the buried water stop belt at the settlement joint is fixed by a special steel bar sleeve or flat steel, the water stop belt is installed in a disc shape, and the included angle between two wings and the horizontal direction is controlled between 15 and 20 degrees;
(7) side wall construction: the side wall of the U-shaped groove adopts a combined steel mould, sponge strips are clamped at the joints of the templates to prevent slurry leakage, and dislocation at the joints of the templates is not more than 2 mm; when the side wall template is supported, the bottom foot is added with sweeping square timber, and the two sides are provided with split bolts, horizontal braces and inclined braces; arranging split bolts every 80cm in a quincunx manner, and adopting square wood back ridges of 15cm multiplied by 15 cm; the PVC pipe is sleeved outside the bolt, so that the split bolt can be smoothly disassembled when the mold is disassembled; when the template is supported, inner supports with the same width as the wall body are arranged on the inner side of the template at intervals and are arranged in a quincunx shape;
the side wall formwork concrete pouring is carried out in a layered mode, during layered pouring, the upper layer concrete pouring is completed before the lower layer concrete is initially set or can be remolded, each layer of vibration is carried out in a circle by circle mode according to the sequence of firstly carrying out center and then carrying out periphery, the vibrating rod is vertically inserted, quickly inserted and slowly pulled, the vibrating rod is inserted along the inner ring of the steel bar during periphery concrete vibration, and the distance between the vibrating rod and the side formwork is kept to be 50-100 mm;
(8) and (3) structural waterproof construction: the U-shaped groove structure adopts self-adhesive coiled material full-wrapping type water resistance, and the internal and external corners are used as coiled material reinforcing layers; after the side wall and the cantilever plate coiled material are laid, the outer side is protected by a plastic foam plate;
the expansion joint is embedded by a hard plastic foam board and a polystyrene foam plastic board, two ends of the expansion joint are sealed by polyurethane sealant, the expansion joint is waterproof by a middle-buried water stop, and the outer side of the side wall is waterproof by a back-attached water stop; a construction joint is arranged at the position of the side wall body of the U-shaped groove, which is 30cm away from the bottom plate, and the construction joint adopts a middle-buried water stop belt for water prevention;
(9) backfilling two sides of the wall body: backfilling with C15 concrete; when backfilling, two sides are symmetrically performed, and vibration is enhanced in the process.
2. The construction method of the U-shaped retaining structure of the roadbed-crossing road, according to claim 1, wherein the U-shaped grooves are 8 sections, each section is 10m, the width is 13.8m, the thickness of a bottom plate is 80cm, the width of a side wall is 80cm, and the height of the side wall is 7.2 m.
3. The construction method of the U-shaped retaining structure of the roadbed-passing highway according to claim 1, wherein reinforced concrete fender piles are arranged on two sides of the U-shaped groove; the length of the fender post is 16m, and the top of the fender post is a reinforced concrete beam of 1.2m multiplied by 1.6 m.
4. The construction method of the U-shaped retaining structure of the roadbed-crossing road as claimed in claim 1, wherein the covering and watering maintenance is carried out after concrete pouring is finished for 14 hours, and the maintenance time is not less than 14 days.
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| CN109488344B (en) * | 2018-10-29 | 2020-08-04 | 中铁十二局集团有限公司 | Waterproof construction method for subway water stop |
| CN109680572B (en) * | 2018-11-26 | 2021-02-26 | 山东汇通建设集团有限公司 | Construction method of integrated comprehensive pipeline of concrete side mould of road bed |
| CN109440545A (en) * | 2018-11-30 | 2019-03-08 | 中铁第四勘察设计院集团有限公司 | The road structure and construction method of operation high-speed railway are worn under a kind of |
| CN109826231A (en) * | 2019-02-15 | 2019-05-31 | 沈阳铁道勘察设计院有限公司 | A kind of novel super-high U-type groove structure and its setting method |
| CN109972646A (en) * | 2019-05-20 | 2019-07-05 | 古清 | Existing railway line line-to-line pile foundation builds mechanical equipment and pile foundation construction method |
| CN110029628A (en) * | 2019-05-24 | 2019-07-19 | 郑州水务建筑工程股份有限公司 | A kind of water conservancy project raft plate dilatation joint waterproof structure |
| CN113373973B (en) * | 2021-01-13 | 2022-11-01 | 贵州智华建设工程(集团)有限责任公司 | U type groove cutting integrated configuration retaining wall |
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| JP3252251B2 (en) * | 1996-01-31 | 2002-02-04 | 興建産業株式会社 | Construction method of L-shaped retaining wall |
| CN203049610U (en) * | 2012-07-25 | 2013-07-10 | 中铁二院工程集团有限责任公司 | Road cutting pile-plank trough type retaining wall structure for railway rich water area |
| CN103590424B (en) * | 2013-11-29 | 2016-06-08 | 李涛 | The underground engineering construction method of road |
| CN107386321A (en) * | 2017-07-21 | 2017-11-24 | 广西金雨伞防水装饰有限公司 | Piping lane movement joint waterproof slab structure and construction method |
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