CN110616719A - Quick construction method for U-shaped groove of upper-span existing culvert - Google Patents

Quick construction method for U-shaped groove of upper-span existing culvert Download PDF

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Publication number
CN110616719A
CN110616719A CN201910779050.7A CN201910779050A CN110616719A CN 110616719 A CN110616719 A CN 110616719A CN 201910779050 A CN201910779050 A CN 201910779050A CN 110616719 A CN110616719 A CN 110616719A
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China
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culvert
shaped groove
pile
existing
construction
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CN110616719B (en
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傅重阳
刘国杰
武永珍
段久波
胡国伟
郑保才
宁轲
郑航
李伟
孟令涛
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China Railway No 3 Engineering Group Co Ltd
Fifth Engineering Co Ltd of China Railway No 3 Engineering Group Co Ltd
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China Railway No 3 Engineering Group Co Ltd
Fifth Engineering Co Ltd of China Railway No 3 Engineering Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2/00General structure of permanent way
    • E01B2/006Deep foundation of tracks
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/06Foundation trenches ditches or narrow shafts
    • E02D17/08Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/10Deep foundations
    • E02D27/12Pile foundations
    • E02D27/14Pile framings, i.e. piles assembled to form the substructure
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00Miscellaneous
    • E02D2600/20Miscellaneous comprising details of connection between elements

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Foundations (AREA)

Abstract

The invention provides a quick construction method for a U-shaped groove of an upper-span existing culvert, belonging to the technical field of culvert U-shaped groove construction and comprising the steps of digging a U-shaped groove foundation pit; constructing a supporting pile; breaking a top plate of the U-shaped groove section culvert structure, removing pile tops of constructed support piles, and anchoring the pile tops into crown beam reinforcing steel bars; a full support is erected in the culvert; constructing a pile top crown beam, a structure distribution beam, a U-shaped groove bottom plate and a culvert top plate to construct structural steel bars together; the U-shaped groove bottom plate and the culvert top plate co-building structure are formed by pouring C35 concrete at one time, and the walls on two sides of the U-shaped groove are constructed through opposite-pulling vertical molds, so that the soil behind the U-shaped groove wall is backfilled after strength is achieved. The method maximizes the construction efficiency of the U-shaped groove and simplifies the construction process on the premise of ensuring the normal use function of the existing culvert and reducing the influence of peripheral pipelines.

Description

Quick construction method for U-shaped groove of upper-span existing culvert
Technical Field
The invention belongs to the technical field of culvert U-shaped groove construction, and particularly discloses a rapid construction method for an upper-span existing culvert U-shaped groove.
Background
Each subway line has an access section line which is excessive from underground to the ground, the transition is usually carried out by adopting a U-shaped groove, the main structure construction is carried out by adopting a formwork method after the traditional U-shaped groove is generally excavated and finished in a foundation pit slope, but because the surrounding environment of the construction in a city is complex, the access section line often conflicts with the existing buildings, pipeline grooves and the like, the line needs to be changed in advance, particularly in a water-rich section with the development of a spring pulse, if the construction of the U-shaped groove conflicts with the existing water culvert, the water culvert needs to be removed in advance, but the water culvert always has the functions of converging rainwater in a mountain area and dredging flood, the removal cannot be carried out on schedule, the removal, the change and the reconstruction can be carried out only after the flood season is over, and the construction period is greatly prolonged; meanwhile, when the new water culvert is rebuilt, the conflict of peripheral equipment such as heating power, electric power, weak wells and the like can be generated, and all the equipment needs to be moved and modified, so that the construction photoperiod is further prolonged; under the condition, how to ensure the normal use and safety of the existing pipe ditch building, and ensure the smooth construction of the U-shaped groove structure of the subway, the deformation and settlement of the existing pipelines, the peripheral pipelines and the building caused by slope-releasing excavation are prevented, and the use function is lost, so that the method is a difficult problem in front of engineering constructors.
Disclosure of Invention
The invention aims to provide a quick construction method for a U-shaped groove of an upper-span existing culvert, which can maximally improve the construction efficiency of the U-shaped groove, simplify the construction process and simultaneously ensure that the existing water passing culvert can normally perform functions of rainwater confluence and flood drainage in mountainous areas on the premise of ensuring the normal use function of the existing culvert and reducing the influence of peripheral pipelines.
In order to achieve the purpose, the invention discloses a quick construction method for a U-shaped groove of an upper span existing culvert, which comprises the following steps:
s1, excavating to the bottom of the U-shaped groove foundation pit at one time by adopting a traditional slope-placing excavation process according to the depth and the position of the U-shaped groove foundation pit;
s2, after the U-shaped groove foundation pit is excavated to a designated elevation, constructing support piles at two sides of the culvert, wherein the length between each support pile and each side beam of the culvert is not less than 1 meter, reducing the influence of pile foundation construction on the side beams of the culvert, arranging pile bodies in parallel along the two sides of the culvert, reserving pile top steel bars, anchoring the pile top steel bars into crown beams to a preset length, and pouring C30 concrete;
s3, utilizing a plane field in a foundation pit of the U-shaped groove excavated to the bottom, breaking a culvert structure top plate in the range of the U-shaped groove, reserving the existing culvert side wall and the existing culvert bottom plate, arranging a breaking line at the joint of the existing culvert top plate and the existing culvert side wall, presetting the depth downwards and including an axillary corner part, simultaneously removing the constructed support pile top, anchoring the retained pile top into a crown beam steel bar, and cleaning up residues and sludge in the culvert by using a digger;
s4, using the cleaned bottom plate of the existing culvert as a supporting foundation, and building full framing in the culvert;
s5, constructing pile top crown beams, structural distribution beams and U-shaped groove bottom plate and culvert top plate steel bars on a construction platform of the full framing, and treating the joints of the pile top crown beams, the structural distribution beams and the U-shaped groove bottom plate and culvert top plate steel bars according to construction joints;
s6, after C35 concrete is poured and molded at one time, the bottom plate of the U-shaped groove and the top plate of the culvert are constructed, the wall bodies on two sides of the U-shaped groove are constructed through opposite-drawing vertical molds, the soil body behind the U-shaped groove wall is backfilled after strength is achieved, the full support in the culvert is removed, and construction is completed.
Specifically, in step S1, the traditional slope excavation process is adopted, the first layer is excavated to a position 0.50m below the second layer of anchor rods, the depth is 3.5m, and the method comprises the following steps of: carrying out slope releasing excavation at the slope rate of 0.5; the length of the side slope anchor rod is 6 m; the thickness of the sprayed layer in the side slope net-hanging concrete is 100mm, C25 early strength concrete is adopted, the reinforcing mesh is phi 8@200 multiplied by 200, and the anchor rods and the reinforcing mesh are welded firmly.
Specifically, in step S2, the diameter of the support pile is 800mm, the pile spacing is 4.2m, and a rotary drill is used to form a hole; the length of the pile top steel bar reserved anchor in the crown beam is 75 cm.
Specifically, in step S3, the breaking line is disposed at a position, at which a top plate of the existing culvert is joined to a side wall of the existing culvert, 30cm downward and includes an axillary corner portion; and removing 1.0m of the pile top of the supporting pile, and keeping the pile top anchored into the crown beam steel bar.
Specifically, in step S4, the full support is a shaped and assembled bowl-mouth support, the vertical and horizontal distances of the vertical rods of the support are 600mm × 600mm, the horizontal rod distances are 1.2m, 45 ° -60 ° cross braces are arranged on the horizontal surface and the inner surface, the top ends of the vertical rods are 50mm × 100mm and 100mm × 100mm square timbers as vertical and horizontal distribution beams, and the bottom membrane is laid on the distribution beams to form a construction platform.
Specifically, in step S5, the pile top crown beams, the structure distribution beams, the U-shaped groove bottom plate and the culvert top plate co-constructed structure are stacked together to form an integral structure through the connecting ribs.
The invention has the beneficial effects that:
the rapid construction method for the U-shaped groove of the upper-span existing culvert can ensure the normal use of the culvert when the U-shaped groove is over the existing culvert, ensure the normal functions of pollution discharge and flood discharge of the culvert, not block the culvert when the U-shaped groove is constructed, simultaneously reduce the influence of adjacent pipelines as much as possible, reduce the excavation amount, further reduce the corresponding earth backfill amount, reduce the excavation depth of the foundation pit and reduce the risk of the foundation pit; the scheme that support pile, crown beam and longeron combine has been taken, has avoided digging greatly and has broken out whole culvert, has reduced the excavation degree of depth, has further reduced the excavation scope, and furthest's protection closes on the pipeline, avoids too big excavation to arouse to close on the pipeline and warp the influence, arouses the secondary even and changes. On the premise, the construction of the U-shaped groove can be implemented, the quality of a formed structure is qualified, the use is safe, and the construction is finished efficiently. The method has the advantages that piles are driven on two sides of the culvert, the oblique lintel parallel to the line of the U-shaped groove is arranged on the piles, the top cover of the culvert and the bottom plate of the U-shaped groove are combined to share, only the connection part of the top plate of the culvert and the U-shaped groove is broken, a full-space support is adopted in the culvert during construction to ensure the normal water passing capacity and the like, the culvert is not required to be broken integrally, the pipeline is not required to be moved and changed, and the construction efficiency is greatly improved on the premise of ensuring the use function of the culvert.
Drawings
FIG. 1 is a schematic view of the co-construction position relationship between a U-shaped groove and an existing culvert;
FIG. 2 is a schematic view showing the relationship between an existing culvert and supporting piles and full framing;
FIG. 3 is a schematic view of reinforcing bars of a support pile;
FIG. 4 is a schematic diagram of reinforcement for connecting a pile top with a crown beam;
FIG. 5 is a schematic view of a transverse connecting support beam reinforcement;
FIG. 6 is a cross-sectional view of a cross-section of a connecting support beam.
In the figure: the method comprises the following steps of 1-existing culvert top plate, 2-existing culvert bottom plate, 3-U-shaped groove range culvert structure top plate, 4-U-shaped groove bottom plate and culvert top plate co-building structure, 5-supporting piles, 6-pile top crown beam, 7-structure distribution beam, 8-U-shaped groove side wall, 9-full support and 10-existing culvert side wall.
Detailed Description
Example 1
The embodiment provides a quick construction method for a U-shaped groove of an upper span existing culvert, which comprises the following steps:
s1, adopting a traditional slope-laying excavation process according to the depth and position of the U-shaped groove foundation pit, adopting slope-laying excavation in advance, sequentially longitudinally drawing a slope to perform flowing water excavation on earthwork, performing horizontal layered slope-laying excavation, performing slope anchor rod excavation after excavation is completed, performing slope net hanging and concrete spraying after anchor rod construction is completed, and performing primary excavation to the bottom of the U-shaped groove foundation pit;
s2, after the U-shaped groove foundation pit is excavated to a designated elevation, constructing support piles 5 on two sides of the culvert, wherein the distance between each support pile 5 and each side beam of the culvert is not less than 1 meter, pile bodies are arranged in parallel along two sides of the culvert, pile top steel bars are reserved and anchored into the top beams to a preset length, and C30 concrete is poured;
s3, utilizing a plane field in a foundation pit of a U-shaped groove excavated to the bottom, breaking a culvert structure top plate 3 in the range of the U-shaped groove, reserving an existing culvert side wall 10 and an existing culvert bottom plate 2, setting a breaking line at the joint of the existing culvert top plate 1 and the existing culvert side wall 10, presetting the depth downwards and including an axillary corner part, simultaneously removing the pile tops of constructed support piles 5, reserving the pile tops, anchoring crown beam steel bars, and cleaning residues and sludge in the culvert by using a digger;
s4, using the cleaned culvert bottom plate 2 as a supporting foundation, and erecting full framing brackets 9 in the culvert;
s5, constructing the reinforcing steel bars of the pile top crown beam 6, the structure distribution beam 7, the U-shaped groove bottom plate and the culvert top plate co-constructed structure 4 on the construction platform of the full-hall support 9, and treating the joints of the pile top crown beam 6, the structure distribution beam 7, the U-shaped groove bottom plate and the culvert top plate co-constructed structure 4 according to construction joints;
s6, after the U-shaped groove bottom plate and the culvert top plate co-building structure 4 is formed by pouring C35 concrete at one time, wall bodies on two sides of the U-shaped groove are constructed through the opposite-pulling vertical molds, soil bodies behind the U-shaped groove walls are backfilled after strength is achieved, full supports in the culvert are removed, and construction is completed.
Example 2
The exit and entrance line of the Jinan track traffic R3 line dragon hole village parking lot is led out from a small mileage end of a Meng Jia village, laid along a Ding Longdao to the south, and a Xin river branch channel is arranged below a line and enters a parking field line across a big Xin river, wherein the total length of a station is 1736.151m, a box culvert top plate of the Xin river branch channel conflicts with a bottom plate of a U-shaped groove of an open cut section, a large slope is required after the whole line is broken, east side heat is generated, and all electric power and weak wells are required to be changed; meanwhile, the major Xinhe branch ditches bear the functions of rainwater confluence and flood drainage in the mountainous areas at the south ends, construction cannot be cut off, drainage in box culverts is continuous, all broken foundations are soaked in water, and normal foundation treatment cannot be carried out. The specific steps of the rapid construction method for the U-shaped groove spanning the existing culvert are as follows.
S1, adopting slope-laying excavation in advance according to the depth and the position of the U-shaped groove foundation pit, longitudinally drawing slope flowing water excavation in turn by earthwork, transversely layering slope-laying excavation, excavating the first layer to 0.50m below the second layer anchor rod, and excavating the depth of about 3.5m, wherein 1 is adopted: and (4) carrying out slope excavation at the slope rate of 0.5, and after the excavation is finished, driving a side slope anchor rod, wherein the length of the anchor rod is 6 m. After the construction of the anchor rod is finished, concrete is sprayed on the side slope by hanging a net, the thickness of the sprayed layer is 100mm, C25 early strength concrete is sprayed, the reinforcing mesh adopts phi 8@200 multiplied by 200 (the diameters of main ribs and distribution ribs are both 8mm, and the intervals are both 200 mm), the anchor rod and the reinforcing mesh are firmly welded, and the anchor rod and the reinforcing mesh are excavated to the bottom of a foundation pit with a U-shaped groove at one time.
S2, after the U-shaped groove foundation pit is excavated to a designated elevation, supporting piles 5 are constructed on two sides of the culvert, the diameter of each pile is 800mm, the distance between every two adjacent piles is 4.2m, holes are formed by rotary drilling, and pile bodies are arranged in parallel along the two sides of the culvert. And (5) reserving the pile top steel bars, anchoring the pile top steel bars into the top beam for 75cm, and pouring C30 concrete.
S3, a top plate 3 of the U-shaped groove section culvert structure is broken by utilizing a plane field in a foundation pit of the U-shaped groove dug to the bottom, an existing culvert side wall 10 and an existing culvert bottom plate 2 are reserved, the two sides of the culvert are prevented from being dug, a breaking line is arranged at the joint of the existing culvert top plate 1 and the existing culvert side wall 10, the breaking line is 30cm downward and comprises an axillary corner part, meanwhile, 1.0m of the constructed 800mm supporting pile top is removed, the pile top is anchored into a crown beam steel bar, and residues and sludge in the culvert are cleaned up by a digger.
S4, using the cleaned existing culvert bottom plate 2 as a supporting foundation, erecting a full-hall support 9 in the culvert, wherein the full-hall support 9 adopts a shaping assembly type bowl mouth support, the vertical and horizontal intervals of the support vertical rods adopt 600mm multiplied by 600mm, the horizontal rod intervals are 1.2m, the horizontal and the inner sides are provided with 45-60-degree cross braces, the top ends of the vertical rods adopt 50mm multiplied by 100mm and 100mm multiplied by 100mm square timber as vertical and horizontal distribution beams, and bottom membranes are laid on the distribution beams to form a construction platform.
5) And constructing 4 steel bars of the pile top crown beam 6, the structure distribution beam 7, the U-shaped groove bottom plate and the culvert top plate on the construction platform, treating the joint of the pile top crown beam 6, the structure distribution beam 7, the U-shaped groove bottom plate and the culvert top plate through the 4 steel bars of the structure built together according to construction joints, and overlapping the pile top crown beam 6, the structure distribution beam 7, the U-shaped groove bottom plate and the culvert top plate through the connecting bars to form an integral structure.
6) The U-shaped groove bottom plate and the culvert top plate co-building structure 4 is formed by pouring C35 concrete at one time, wall bodies on two sides of the U-shaped groove are constructed through the opposite-pulling vertical molds, the soil body behind the U-shaped groove wall is backfilled after strength is achieved, the inner support of the culvert is withdrawn, and construction is completed.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, or direct or indirect applications in other related fields, which are made by the contents of the present specification, are included in the scope of the present invention.

Claims (6)

1. A quick construction method for a U-shaped groove of an upper span existing culvert is characterized by comprising the following steps:
s1, excavating to the bottom of the U-shaped groove foundation pit at one time by adopting a slope-placing excavation process according to the depth and the position of the U-shaped groove foundation pit;
s2, after the U-shaped groove foundation pit is excavated to a designated elevation, constructing support piles at two sides of the culvert, wherein the distance between each support pile and each side beam of the culvert is not less than 1 meter, the pile bodies are arranged in parallel along the two sides of the culvert, pile top steel bars are reserved and anchored into the top beams to a preset length, and C30 concrete is poured;
s3, utilizing a plane field in a foundation pit of the U-shaped groove excavated to the bottom, breaking a culvert structure top plate in the range of the U-shaped groove, reserving the existing culvert side wall and the existing culvert bottom plate, arranging a breaking line at the joint of the existing culvert top plate and the existing culvert side wall, presetting the depth downwards and including an axillary corner part, simultaneously removing the constructed support pile top, anchoring the retained pile top into a crown beam steel bar, and cleaning up residues and sludge in the culvert by using a digger;
s4, using the cleaned bottom plate of the existing culvert as a supporting foundation, and building full framing in the culvert;
s5, constructing a pile top crown beam, a structure distribution beam, a U-shaped groove bottom plate and a culvert top plate co-constructed structural steel bar on a construction platform of the full hall support, and treating the joint of the pile top crown beam, the structure distribution beam, the U-shaped groove bottom plate and the culvert top plate co-constructed structural steel bar according to construction joints;
s6, after C35 concrete is poured and molded at one time, the bottom plate of the U-shaped groove and the top plate of the culvert are constructed, the wall bodies on two sides of the U-shaped groove are constructed through opposite-drawing vertical molds, the soil body behind the U-shaped groove wall is backfilled after strength is achieved, the full support in the culvert is removed, and construction is completed.
2. The method for rapidly constructing an upper span existing culvert U-shaped groove according to claim 1, wherein in the step S1, a slope-releasing excavation process is adopted, the first layer is excavated to a position 0.50m below the second layer of anchor rods, the depth is 3.5m, and the method comprises the following steps of: carrying out slope releasing excavation at the slope rate of 0.5;
the length of the side slope anchor rod is 6 m;
the thickness of the sprayed layer in the side slope net-hanging concrete is 100mm, C25 early strength concrete is adopted, the reinforcing mesh is phi 8@200 multiplied by 200, and the anchor rods and the reinforcing mesh are welded firmly.
3. The rapid construction method of an upper span existing culvert U-shaped groove according to claim 2, wherein in the step S2, the diameter of the supporting piles is 800mm, the distance between the piles is 4.2m, and holes are drilled by a rotary drilling machine;
the length of the pile top steel bar reserved anchor in the crown beam is 75 cm.
4. The rapid construction method of an upper span existing culvert U-shaped groove according to claim 3, wherein in the step S3, the breaking line is arranged at the joint of the existing culvert top plate and the existing culvert side wall, is downward 30cm and comprises an axillary corner part;
and removing 1.0m of the pile top of the supporting pile, and keeping the pile top anchored into the crown beam steel bar.
5. The method for rapidly constructing a U-shaped groove of an upper span existing culvert according to claim 4, wherein in the step S4, the full support adopts a shaped assembled bowl-mouth support, the vertical and horizontal intervals of the vertical rods of the support adopt 600mm x 600mm, the horizontal rod intervals are 1.2m, the horizontal and inner sides are provided with 45-60-degree cross braces, the top ends of the vertical rods adopt 50mm x 100mm and 100mm x 100mm square timbers as vertical and horizontal distribution beams, and bottom membranes are laid on the distribution beams to form a construction platform.
6. The method for rapidly constructing an upper span existing culvert U-shaped groove according to claim 5, wherein in the step S5, pile top crown beams, structural distribution beams, structural reinforcing steel bars which are built by the U-shaped groove bottom plate and the culvert top plate are overlapped into an integral structure through connecting bars.
CN201910779050.7A 2019-08-22 2019-08-22 Quick construction method for U-shaped groove of upper-span existing culvert Active CN110616719B (en)

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Publication number Priority date Publication date Assignee Title
CN113090066A (en) * 2021-04-16 2021-07-09 华润建筑有限公司 Construction method for newly added entrances and exits of existing buildings and elevator shaft
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