CN114134831A - Backfill structure and construction method of small-caliber steel corrugated pipe culvert - Google Patents
Backfill structure and construction method of small-caliber steel corrugated pipe culvert Download PDFInfo
- Publication number
- CN114134831A CN114134831A CN202111384964.7A CN202111384964A CN114134831A CN 114134831 A CN114134831 A CN 114134831A CN 202111384964 A CN202111384964 A CN 202111384964A CN 114134831 A CN114134831 A CN 114134831A
- Authority
- CN
- China
- Prior art keywords
- corrugated pipe
- foundation pit
- pipe culvert
- steel
- rapid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 107
- 239000010959 steel Substances 0.000 title claims abstract description 107
- 238000010276 construction Methods 0.000 title claims abstract description 41
- 238000005056 compaction Methods 0.000 claims abstract description 39
- 230000010412 perfusion Effects 0.000 claims abstract description 34
- 239000012530 fluid Substances 0.000 claims abstract description 23
- 239000002689 soil Substances 0.000 claims description 35
- 239000004567 concrete Substances 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 238000005187 foaming Methods 0.000 claims 1
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 9
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 9
- 238000009412 basement excavation Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000011381 foam concrete Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Sewage (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a backfill structure of a small-caliber steel corrugated pipe culvert and a construction method, wherein corrugated pipes in the backfill structure are laid at the bottom of a foundation pit arranged on the surface of a tamping roadbed; the bottom of the foundation pit is an arc-shaped surface; and a flow-state self-compacting rapid-setting perfusion medium is filled between the corrugated pipe and the inner wall of the foundation pit. When the corrugated steel pipe culvert is placed in the foundation pit, a fluid self-compacting rapid-hardening perfusion medium is injected from one side of the corrugated steel pipe culvert, and when the fluid self-compacting rapid-hardening perfusion medium completely fills a gap between the corrugated steel pipe culvert and the bottom of the foundation pit, the first pouring is stopped; and after the medium is solidified, pouring the flow-state self-compaction rapid-setting perfusion medium from two sides of the steel corrugated pipe culvert in batches until the flow-state self-compaction rapid-setting perfusion medium completely covers the outer surface of the steel corrugated pipe culvert. The backfill structure and the construction method carry out dense backfill on all the positions around the steel corrugated pipe, and can give full play to the superior performance of the steel corrugated pipe culvert.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a backfill structure of a small-caliber steel corrugated pipe culvert and a construction method.
Background
The steel corrugated pipe culvert is introduced for nearly 20 years, and has been applied to many highway projects due to the advantages of light weight, low manufacturing cost, strong adaptive deformation capacity, no need of special treatment for the foundation and the like of an assembled structure, but the steel corrugated pipe culvert is of a semi-flexible structure, the stress principle is that pipe and soil are stressed together, the surrounding backfill soil is required to provide uniform pressure or reverse thrust for the steel corrugated pipe culvert, the compactness of the surrounding backfill soil is required to reach more than 95%, and the strength of the backfill material is basically consistent, so the product has very high dependence on the construction quality of the surrounding backfill soil.
However, in actual construction, the backfill soil of the wedge-shaped part formed by the pipe bottom and the foundation is difficult to tamp, if the pipe body is tamped by forcibly using a wood rod, the pipe body floats upwards or deflects left and right, and if the part is not tamped, the pipe body deforms, so that in few projects, the part is compacted by adopting a coarse sand watertight method, but the cost of the method is too high, and the coarse sand source is limited, so the method is rarely used. In addition, the backfill on both sides of the tube body has a thickness of about 20-30 cm and cannot be compacted because the tamping machine needs to keep a certain safety distance from the tube body so as not to damage the tube body. In addition, when the thickness of the backfill soil at the top of the pipe body reaches about 50 cm, a small-sized tamping machine is allowed to be used so as to prevent the pipe body from being damaged by impact, and the bottom layer of the backfill soil with the thickness cannot meet the requirement of compactness. In conclusion, in the practical engineering use, the backfill quality required by the design is difficult to achieve, and the quality problems such as deformation of the steel corrugated pipe culvert and the like are often caused.
In the prior art, the caliber of a reinforced concrete circular pipe culvert used by a small-caliber pipe culvert in highway engineering is generally 1 meter, 1.5 meters or 2 meters, the culvert with the circular pipes has the advantages that the length of each section is short (the general length is 2 meters), the weight is heavy, the culvert can not adapt to the reasons of foundation settlement and the like, the construction quality requirement is high, the measures are more, the manufacturing cost is high, the bearing capacity of the foundation is larger than the peripheral bearing capacity under the general condition, a concrete cushion layer is arranged, the pipe bodies are arranged on the cushion layer, the pipe sections are sealed, then the concrete at the wedge-shaped part between the pipe body and the foundation cushion layer is poured by a supporting mould, then the platform backs at the two sides of the pipe body are continuously poured by the supporting mould concrete, structural backfilling is carried out on the two sides until the pipe top is reached after the concrete is solidified, the culvert structure and the construction method have long period, multiple working procedures, high labor cost and high material cost, and after the highway runs for a certain time, engineering diseases such as cracking, water leakage and the like between pipe joints due to settlement are very common.
According to the traditional construction method, when the distance between adjacent culverts is short and the number of the culverts is large, the culverts divide the roadbed into a plurality of sections, the working face of the construction machinery between the culverts is not large, the working efficiency of the construction machinery is low, and in addition, the special backfilling areas on the two sides of each culvert are high in construction requirement due to the fact that the special backfilling areas are close to the culvert pipes, the construction speed is low, and large-area tamping is not facilitated.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a backfill structure of a small-caliber steel corrugated pipe culvert; the second purpose of the invention is to provide a construction method of the small-caliber steel corrugated pipe culvert.
The technical scheme is as follows: the invention discloses a backfill structure of a small-caliber steel corrugated pipe culvert, which aims to realize the aim, wherein a corrugated pipe is laid at the bottom of a foundation pit arranged on the surface of a compacted roadbed; and a flow state self-compaction and rapid-hardening perfusion medium is filled between the corrugated pipe and the inner wall of the foundation pit, and the top surface of the flow state self-compaction and rapid-hardening perfusion medium is higher than the top of the corrugated pipe.
The bottom of the foundation pit is an arc-shaped surface or a plane.
Preferably, the width of the foundation pit is not more than 10 cm of the outer diameter of the corrugated pipe; when the corrugated pipe is laid at the bottom of the foundation pit, the distance between the top opening of the foundation pit and the top of the corrugated pipe is not less than 20 cm.
Preferably, the corrugated pipe is made by splicing a plurality of sections of corrugated pipe sections.
Preferably, the fluid self-compacting rapid-setting perfusion medium is cement soil or foamed concrete.
Further, the cement soil raw materials comprise foundation pit spoil and cement.
Furthermore, the corrugated pipe is made of steel, when the bottom of a foundation pit formed by excavation on the surface of the tamped roadbed adopts an arc surface, the edge of the bottom of the foundation pit is semicircular in vertical section under general conditions, the diameter of a circle where the edge of the bottom of the foundation pit is located is larger than the outer diameter of the corrugated pipe, and when the corrugated pipe is laid at the bottom of the foundation pit, the corrugated pipe can automatically slide to the central position of the bottom of the foundation pit under the action of gravity, so that the corrugated pipe is favorable for positioning. The flow state self-compaction rapid-hardening perfusion medium injected between the corrugated pipe and the inner wall of the foundation pit can self-compact and fill all gaps between the corrugated pipe and the inner wall of the foundation pit, including wedge-shaped gaps between the bottom of the corrugated pipe and the bottom surface of the foundation pit.
Compared with a straight pit bottom structure with a vertical side wall, the semicircular pit bottom of the foundation pit is more stable and is not easy to collapse.
Furthermore, when the bottom of the foundation pit formed by excavation is a plane, the corrugated pipe placed in the foundation pit can be positioned through an external support frame or other limiting devices, the central axis of the positioned corrugated pipe is determined, and a flow-state self-compaction rapid-hardening perfusion medium is injected between the corrugated pipe and the inner wall of the foundation pit to finish backfilling.
Furthermore, the material cost and the construction cost can be greatly reduced by using the excavated foundation pit waste soil and the cement soil prepared from the high-grade cement as a flow-state self-compacting rapid-setting perfusion medium, and the method is economic and environment-friendly. The strength of the cement soil prepared by the waste soil of the foundation pit and the high-grade cement is not less than 0.6 Mpa.
Furthermore, the corrugated pipe is transported to a construction site after being cut and segmented in a factory, and is sequentially welded in situ along the splicing seams on the site to form a continuous corrugated pipe which is then placed into the foundation pit.
Furthermore, after the fluid self-compacting rapid-setting perfusion medium is injected into the foundation pit, the height of the top surface of the perfusion medium is not less than 20 cm higher than the top of the corrugated pipe, and the strength of the solidified medium can protect the corrugated pipe from being damaged by large-scale tamping machinery during subsequent construction.
The invention relates to a construction method of a small-caliber steel corrugated pipe culvert, which comprises the following steps:
(1) excavating a foundation pit on the surface of the roadbed to form a foundation pit;
(2) placing the steel corrugated pipe culvert into a foundation pit;
(3) an anti-floating device is arranged at the upper part of the steel corrugated pipe culvert, a fluid self-compacting and rapid-hardening pouring medium is injected from one side of the steel corrugated pipe culvert, and when the fluid self-compacting and rapid-hardening pouring medium completely fills a gap between the steel corrugated pipe culvert and the bottom of a foundation pit, the first pouring is stopped;
(4) and after the fluid state self-compaction rapid hardening pouring medium poured for the first time is solidified, removing the anti-floating device, pouring the fluid state self-compaction rapid hardening pouring medium from two sides of the steel corrugated pipe culvert in batches until the fluid state self-compaction rapid hardening pouring medium completely coats the outer surface of the steel corrugated pipe culvert.
Preferably, the bottom surface of the foundation pit dug and formed on the surface of the roadbed in the step (1) is an arc-shaped surface or a plane.
Preferably, the anti-floating device is a limiting steel frame or a sand-soil bag paved on the top of the steel corrugated pipe culvert.
Preferably, after the outer surface of the steel corrugated pipe culvert is completely coated by the flow-state self-compaction rapid-hardening pouring medium, the distance from the top of the flow-state self-compaction rapid-hardening pouring medium to the top of the steel corrugated pipe culvert is not less than 20 cm.
Furthermore, a plurality of sections of corrugated steel pipes are coaxially connected along the splicing seams to form a continuous corrugated steel pipe culvert, and the continuous corrugated steel pipe culvert is placed in the foundation pit.
Further, different from the traditional construction mode, when the roadbed is constructed to the bottom of the designed position of the culvert, the construction of the steel corrugated pipe culvert is not carried out, the roadbed is continuously constructed upwards and tamped, and when the tamped roadbed exceeds the designed position of the top of the culvert by at least 20 centimeters, a special trenching machine is used for excavating a culvert foundation pit. Cleaning and compacting the side wall and the bottom surface of the foundation pit after the bottom surface dug by the trenching machine is a circular arc or plane foundation pit, and digging the foundation pit through at one time according to a set length; the depth of the excavated foundation pit exceeds the diameter of the corrugated pipe by at least 20 cm, and the width of the foundation pit is larger than the diameter of the corrugated pipe by no more than 10 cm. The foundation pit with the arc-shaped bottom surface can reduce disturbance on the surrounding soil body and reduce loosening of the surrounding soil body.
Furthermore, the foundation pit excavated on the compacted roadbed replaces backfill in the prior art, so that the construction speed of the roadbed with the culvert height as the thickness part is improved, and the development of the working surface of the construction machine during the construction of the roadbed with the thickness is facilitated.
Further, a plurality of steel corrugated pipe cuts prefabricated in the factory can be welded along the splicing seam on one side of the foundation pit to form a continuous whole steel corrugated pipe culvert, the length of the whole steel corrugated pipe culvert reaches the total length designed by the culvert, and a plurality of hoisting devices are utilized to place the whole steel corrugated pipe culvert which is connected and completed into the foundation pit at one time to complete the laying of the steel corrugated pipe culvert. The whole steel corrugated pipe culvert can be spliced simultaneously with the excavation of the foundation pit.
Further, after the corrugated steel pipe culvert is laid and is accomplished, pouring flow state self-compaction rapid hardening filling medium from corrugated steel pipe culvert one side in the first pouring stage, because corrugated steel pipe culvert outer wall is the spiral corrugate, and there is the clearance between the foundation ditch bottom surface, flow state self-compaction rapid hardening filling medium from one side pouring can flow to the opposite side through the clearance, can cover the clearance between corrugated steel pipe culvert outer wall and the foundation ditch bottom surface completely until corrugated steel pipe culvert opposite side liquid level, at this moment, flow state self-compaction rapid hardening filling medium is with the complete closely knit packing of wedge space between corrugated steel pipe culvert and the foundation ditch, flow state self-compaction rapid hardening filling medium after solidifying simultaneously and bellows zonulae occludens, tentatively spacing to the bellows has increased its counter weight simultaneously. In the subsequent pouring process, the two sides of the corrugated steel pipe culvert are poured in different times, and the two sides are poured in sequence, so that the situation that the corrugated steel pipe culvert is extruded due to excessive one-time pouring at the same side, and the pouring quality is reduced is prevented. Finally, the pouring is stopped until the pouring exceeds 20 cm of the top of the culvert pipe of the steel corrugated pipe. The solidified flow-state self-compaction and quick-setting perfusion medium and the tamped backfill around the perfusion medium form an integral coating for the pipe body, the top of the structure can be directly paved with a road base layer, and a large-scale tamping machine can be used for tamping. The foundation pit with the arc-shaped bottom surface can reduce the use amount and the engineering amount of the flow-state self-compaction rapid-hardening perfusion medium.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the technical method comprises the steps of filling a fluid self-compacting rapid-setting perfusion medium into a foundation pit with a circular arc-shaped bottom surface of the steel corrugated pipe culvert, and after the fluid self-compacting rapid-setting perfusion medium is solidified, densely backfilling all parts around the steel corrugated pipe, in particular to a wedge-shaped space between the bottom of the steel corrugated pipe culvert and the foundation pit. The solidified flow-state self-compaction rapid-solidification perfusion medium coats the whole steel corrugated pipe culvert, and the superior performance of the steel corrugated pipe culvert can be fully exerted.
Drawings
FIG. 1 is a schematic view of a vertical cross-section structure of a culvert for steel corrugated pipes laid in a foundation pit according to the present invention.
Fig. 2 is a schematic view of a-a cross-sectional structure in fig. 1.
FIG. 3 is a schematic illustration of the position of the fluidized self-compacting rapid-setting perfusion medium after the first pour in the present invention.
FIG. 4 is a schematic structural view of the self-compacting and rapid-setting fluidized perfusion medium of the present invention after being poured from two sides of a culvert of a steel corrugated pipe in sequence.
FIG. 5 is a schematic structural diagram of the pouring of the fluidized self-compacting rapid-setting pouring medium of the present invention to a set height.
Fig. 6 is a schematic structural diagram of backfilling a steel corrugated pipe culvert by using backfilled soil in the prior art.
Fig. 7 is a schematic diagram of a reinforced concrete circular pipe culvert backfill structure in the prior art.
Detailed Description
In the prior art, backfill construction is performed on a steel corrugated pipe culvert through the surrounding backfill soil, as shown in fig. 6, however, during actual construction, the backfill soil 8 in the wedge-shaped structure 7 between the corrugated pipe 4 and the roadbed 1 is difficult to tamp, so that the construction difficulty and the construction cost are greatly improved, and the construction quality is difficult to guarantee. The concrete round pipe culvert 12 needs to be paved with a concrete cushion 9 in advance due to heavy weight and incapability of adapting to foundation settlement, the concrete round pipe culvert 12 is paved on the concrete cushion 9, the joints of all the concrete round pipes are sealed, a formwork is cast to cast concrete 10 at the wedge-shaped part between the bottom of the concrete round pipe culvert 12 and the concrete cushion 9, after the concrete is solidified, the formwork is continuously cast with concrete terraces 11 at two sides of the pipe body of the concrete round pipe culvert 12, and after the concrete is solidified, structural backfilling is carried out at two sides by using backfill soil 8 until the pipe top, as shown in fig. 7.
In view of the above-mentioned drawbacks of the prior art, the following describes the technical solution of the present invention in detail with reference to the accompanying drawings and embodiments.
A backfill structure of a small-caliber steel corrugated pipe culvert is characterized in that as shown in figure 1, a foundation pit 2 is formed on a pre-compacted roadbed 1 by excavating according to a set extending direction, and the thickness of the roadbed 1 exceeds the outer diameter of a corrugated pipe 4. The bottom surface of the foundation pit 2 is a semicircular arc-shaped surface 3, the deepest depth of the foundation pit 2 is 20 cm larger than the outer diameter of the corrugated pipe 4, and the width of the foundation pit 2 is 10 cm larger than the outer diameter of the corrugated pipe 4.
Bellows 4 is laid in the bottom of foundation ditch 2, fills flow state self-compaction rapid hardening filling medium 5 between the outer wall of bellows 4 and the inner wall of foundation ditch 2, and the top surface height of filling flow state self-compaction rapid hardening filling medium 5 in foundation ditch 2 is higher than 4 pipe tops of bellows 20 centimetres. The flow state self-compaction rapid-setting perfusion medium 5 is solidified and then integrally coated with the compacted roadbed structure around the flow state self-compaction rapid-setting perfusion medium 5.
In this embodiment, the corrugated pipe 4 is a corrugated steel pipe prefabricated in a factory, and for convenience of transportation, the corrugated steel pipe is cut into corrugated steel pipe sections with a set length in the factory, and the corrugated steel pipe sections are sequentially marked, and are arranged in a cutting sequence according to the designed length and the extending direction after being transported to a site, and are welded in situ along the splicing seam 13 to form a continuous whole corrugated pipe 4, and the continuous whole corrugated pipe 4 is laid at the bottom of the foundation pit 2, as shown in fig. 2.
Further, the fluid self-compacting rapid-setting perfusion medium 5 can be made of cement soil or foamed concrete. In this embodiment, the fluid self-compacting rapid-setting perfusion medium 5 is cemented soil, the manufacturing raw materials of the cemented soil include high-grade cement and soil generated by excavation of the foundation pit 2, and the strength of the obtained cemented soil is not lower than 0.6 MPa.
In this embodiment, the corrugated pipe 4 is entirely coated with a fluid self-compacting rapid-setting grouting medium 5, the remaining space of the foundation pit 2 is backfilled with backfill, and after being directly tamped by a large-sized tamping machine, a road surface 6 is laid on the surface of the roadbed 1.
A construction method of a small-caliber steel corrugated pipe culvert comprises the following steps:
(1) when the roadbed is constructed to the bottom of the designed position of the steel corrugated pipe culvert, the laying construction of the steel corrugated pipe culvert is not carried out, but the upward construction and the tamping of the roadbed are continued, when the height of the roadbed exceeds the pipe top position of the steel corrugated pipe culvert by 20 cm, the roadbed thickening operation is stopped, a special excavator with an arc digging cutter is used for digging a foundation pit on the surface of the roadbed to form a foundation pit, the bottom surface of the foundation pit is a semicircular arc-shaped surface, the deepest depth of the foundation pit 2 is more than 20 cm of the outer diameter of the corrugated pipe 4, and the width of the foundation pit 2 is more than 10 cm of the outer diameter of the corrugated pipe 4; and cleaning and compacting the arc-shaped bottom surface and the side wall of the foundation pit. The excavation of the foundation pit is dug through at one time, and the designed length is reached according to the designed extending direction.
(2) And (3) transferring the whole steel corrugated pipe culvert after connection into the foundation pit by utilizing a plurality of hoisting devices at one time, and adjusting the position of the corrugated pipe culvert.
(3) The corrugated steel pipe culvert is connected with the anti-floating device, a flow-state self-compaction rapid-hardening perfusion medium is injected from one side of the corrugated steel pipe culvert, and when the flow-state self-compaction rapid-hardening perfusion medium completely fills the gap between the corrugated steel pipe culvert and the bottom of the foundation pit, the first pouring is stopped, as shown in figure 3.
(4) After the fluid self-compaction rapid-hardening pouring medium poured for the first time is solidified, the anti-floating device is removed, the fluid self-compaction rapid-hardening pouring medium is poured from two sides of the steel corrugated pipe culvert in times, the height of the pouring is 20 cm at each time, and the steel corrugated pipe culvert is completely coated by the fluid self-compaction rapid-hardening pouring medium until the outer surface of the steel corrugated pipe culvert is completely coated by the fluid self-compaction rapid-hardening pouring medium, as shown in fig. 4.
(5) And (3) continuing pouring above the steel corrugated pipe culvert until the height exceeds 20 cm of the top of the steel corrugated pipe culvert, stopping pouring, and filling and tamping the residual space by using backfill soil if an unfilled space exists above the foundation pit after the steel corrugated pipe culvert is solidified as shown in figure 5.
(6) And paving the roadbed surface to form the road surface.
In this embodiment, anti floating device is spacing steelframe or lays the sand and soil bag at steel corrugated pipe culvert pipe top, no matter adopts spacing steelframe or sand and soil area, all provides decurrent pressure for steel corrugated pipe culvert, prevents to pour into the flow state self-compaction rapid hardening filling medium back steel corrugated pipe culvert body come-up.
When the bottom surface of the excavated foundation pit is a circular arc surface, the structure of the foundation pit is more stable and is not easy to collapse, the disturbance to the surrounding soil body is reduced while the excavation amount is reduced, and the circular bottom surface of the foundation pit is also beneficial to positioning of the steel corrugated pipe culvert. After the steel corrugated pipe culvert is wholly coated by the flow-state self-compaction and rapid-setting perfusion medium, the top of the structure can be directly paved on a road base layer and can be tamped by a large-scale tamping machine.
In conclusion, the backfill structure and the construction method of the small-caliber steel corrugated pipe culvert can ensure the backfill compactness of all the positions around the steel corrugated pipe culvert, particularly ensure the backfill compactness in the wedge-shaped structural space at the bottom of the steel corrugated pipe culvert, and fully exert the excellent performance of the steel corrugated pipe culvert. Compared with the integral backfill of backfill soil, the culvert for laying the steel corrugated pipes in the foundation pit is directly excavated and formed on the roadbed, so that the construction speed and the construction quality can be improved, and the mechanical working face can be unfolded during construction. Meanwhile, the waste soil generated by excavating the foundation pit can be used as a raw material of a flow-state self-compaction rapid-hardening perfusion medium, local materials are obtained, the environment is protected, and the material cost and the construction cost can be reduced.
Claims (10)
1. The utility model provides a backfill structure of small-bore steel bellows culvert which characterized in that: the corrugated pipe (4) is laid at the bottom of a foundation pit (2) arranged on the surface of the tamping roadbed (1); and a flow state self-compaction rapid-hardening perfusion medium (5) is filled between the corrugated pipe (4) and the inner wall of the foundation pit (2), and the top surface of the flow state self-compaction rapid-hardening perfusion medium (5) is higher than the pipe top of the corrugated pipe (4).
2. The backfill structure for a small-caliber steel corrugated pipe culvert according to claim 1, characterized in that: the bottom of the foundation pit (2) is an arc surface or a plane.
3. The backfill structure for a small-caliber steel corrugated pipe culvert according to claim 1, characterized in that: the width of the foundation pit (2) is not more than 10 cm of the outer diameter of the corrugated pipe (4); when the corrugated pipe (4) is laid at the bottom of the foundation pit (2), the distance between the top opening of the foundation pit (2) and the top of the corrugated pipe is not less than 20 cm.
4. The backfill structure for a small-caliber steel corrugated pipe culvert according to claim 1, characterized in that: the corrugated pipe (4) is formed by splicing a plurality of sections of corrugated pipe sections.
5. The backfill structure for a small-caliber steel corrugated pipe culvert according to claim 1, characterized in that: the flow state self-compaction quick-setting perfusion medium (5) adopts cement soil or foaming concrete.
6. The backfill structure for a small-caliber steel corrugated pipe culvert according to claim 5, characterized in that: the cement soil raw material comprises waste soil and cement of the foundation pit (2).
7. A construction method of a small-caliber steel corrugated pipe culvert is characterized by comprising the following steps: the method comprises the following steps:
(1) excavating a foundation pit on the surface of the roadbed to form a foundation pit;
(2) placing the steel corrugated pipe culvert into a foundation pit;
(3) an anti-floating device is arranged at the upper part of the steel corrugated pipe culvert, a fluid self-compacting and rapid-hardening pouring medium is injected from one side of the steel corrugated pipe culvert, and when the fluid self-compacting and rapid-hardening pouring medium completely fills a gap between the steel corrugated pipe culvert and the bottom of a foundation pit, the first pouring is stopped;
(4) and after the fluid state self-compaction rapid hardening pouring medium poured for the first time is solidified, removing the anti-floating device, pouring the fluid state self-compaction rapid hardening pouring medium from two sides of the steel corrugated pipe culvert in batches until the fluid state self-compaction rapid hardening pouring medium completely coats the outer surface of the steel corrugated pipe culvert.
8. The construction method of the small-caliber steel corrugated pipe culvert according to claim 7, wherein: and (2) digging the foundation pit formed on the surface of the roadbed in the step (1) to form a bottom surface which is an arc-shaped surface or a plane.
9. The construction method of the small-caliber steel corrugated pipe culvert according to claim 7, wherein: the anti-floating device is a limiting steel frame or a sand-soil bag paved on the top of the steel corrugated pipe culvert pipe.
10. The construction method of the small-caliber steel corrugated pipe culvert according to claim 7, wherein: after the outer surface of the corrugated steel pipe culvert is completely coated by the flow-state self-compaction rapid-hardening perfusion medium, the distance from the top of the flow-state self-compaction rapid-hardening perfusion medium to the top of the corrugated steel pipe culvert is not less than 20 cm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021112302318 | 2021-10-22 | ||
| CN202111230231 | 2021-10-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114134831A true CN114134831A (en) | 2022-03-04 |
Family
ID=80390616
Family Applications (6)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122864300.2U Active CN217758400U (en) | 2021-10-22 | 2021-11-22 | Backfill structure of small-bore steel bellows culvert |
| CN202111384964.7A Withdrawn CN114134831A (en) | 2021-10-22 | 2021-11-22 | Backfill structure and construction method of small-caliber steel corrugated pipe culvert |
| CN202220681059.1U Active CN217870532U (en) | 2021-10-22 | 2022-03-28 | Backfill structure for pipeline construction |
| CN202210309108.3A Pending CN114673172A (en) | 2021-10-22 | 2022-03-28 | Backfill structure for pipeline construction and construction method |
| CN202210815670.3A Pending CN115075265A (en) | 2021-10-22 | 2022-07-12 | Backfill structure for pipeline construction and construction method |
| CN202221786870.2U Active CN218933157U (en) | 2021-10-22 | 2022-07-12 | Backfill structure for pipeline construction |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122864300.2U Active CN217758400U (en) | 2021-10-22 | 2021-11-22 | Backfill structure of small-bore steel bellows culvert |
Family Applications After (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220681059.1U Active CN217870532U (en) | 2021-10-22 | 2022-03-28 | Backfill structure for pipeline construction |
| CN202210309108.3A Pending CN114673172A (en) | 2021-10-22 | 2022-03-28 | Backfill structure for pipeline construction and construction method |
| CN202210815670.3A Pending CN115075265A (en) | 2021-10-22 | 2022-07-12 | Backfill structure for pipeline construction and construction method |
| CN202221786870.2U Active CN218933157U (en) | 2021-10-22 | 2022-07-12 | Backfill structure for pipeline construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (6) | CN217758400U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN217758400U (en) * | 2021-10-22 | 2022-11-08 | 南京联众工程技术有限公司 | Backfill structure of small-bore steel bellows culvert |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111535208A (en) * | 2019-10-16 | 2020-08-14 | 新疆交通建设集团股份有限公司 | Construction process of foam concrete and steel corrugated pipe composite culvert |
| CN213114726U (en) * | 2020-07-07 | 2021-05-04 | 南京紫城工程设计有限公司 | Flow state soil cement pipe gallery foundation pit |
| CN217758400U (en) * | 2021-10-22 | 2022-11-08 | 南京联众工程技术有限公司 | Backfill structure of small-bore steel bellows culvert |
-
2021
- 2021-11-22 CN CN202122864300.2U patent/CN217758400U/en active Active
- 2021-11-22 CN CN202111384964.7A patent/CN114134831A/en not_active Withdrawn
-
2022
- 2022-03-28 CN CN202220681059.1U patent/CN217870532U/en active Active
- 2022-03-28 CN CN202210309108.3A patent/CN114673172A/en active Pending
- 2022-07-12 CN CN202210815670.3A patent/CN115075265A/en active Pending
- 2022-07-12 CN CN202221786870.2U patent/CN218933157U/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111535208A (en) * | 2019-10-16 | 2020-08-14 | 新疆交通建设集团股份有限公司 | Construction process of foam concrete and steel corrugated pipe composite culvert |
| CN213114726U (en) * | 2020-07-07 | 2021-05-04 | 南京紫城工程设计有限公司 | Flow state soil cement pipe gallery foundation pit |
| CN217758400U (en) * | 2021-10-22 | 2022-11-08 | 南京联众工程技术有限公司 | Backfill structure of small-bore steel bellows culvert |
Also Published As
| Publication number | Publication date |
|---|---|
| CN217758400U (en) | 2022-11-08 |
| CN114673172A (en) | 2022-06-28 |
| CN218933157U (en) | 2023-04-28 |
| CN217870532U (en) | 2022-11-22 |
| CN115075265A (en) | 2022-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108914931B (en) | Assembled vertical shield annular foundation pile and construction method | |
| US20140026518A1 (en) | Construction method for root-type foundation anchorage and bored, root-type cast in-situ pile with anchor bolts | |
| CN207512745U (en) | A kind of caisson device and its foundation pit structure | |
| CN109323049A (en) | Bushing type aqueduct and its construction method of installation applied to through bridge | |
| CN100387790C (en) | Ground caisson construction technology and ground caisson | |
| CN101718099A (en) | Automatic wall-forming device and method of static pressure continuous concrete wall | |
| CN210238534U (en) | Flexible reverse-wrapping backfill structure for annular inner support large-diameter corrugated pipe culvert | |
| CN111778941A (en) | High-standard farmland channel construction method and structure | |
| CN217758400U (en) | Backfill structure of small-bore steel bellows culvert | |
| CN111335263B (en) | Method for building artificial island | |
| CN105332382A (en) | River-adjacent-foundation-pit island-building cofferdam clay sealing construction method | |
| CN115450221B (en) | Construction method for subway crossing river channel | |
| KR100948060B1 (en) | Constructing method for arranging river bank using steel casing retaining wall | |
| CN112343614B (en) | U-shaped shield tunneling machine-based overlapped-spliced comprehensive pipe gallery construction method | |
| CN111022764B (en) | Dry construction method for water diversion pipe water-land adapter | |
| CN110424331A (en) | A kind of power station pin-connected panel water-drawing channel and construction method | |
| CN110306484A (en) | The well construction of falling rainbow method | |
| CN111042144A (en) | Excavation method for foundation pit of underground beam under condition of continuous flow of riverway in cold region | |
| CN111501681B (en) | TRD construction method continuous wall and earth-rock cofferdam combined composite temporary water retaining structure and construction method | |
| CN219951575U (en) | Road structure of underpass railway bridge | |
| CN113585237B (en) | Diaphragm wall joint and diaphragm wall construction method | |
| CN217603649U (en) | Protection architecture of existing important pipeline in underground | |
| CN112900364B (en) | Anti-scouring and anti-sliding structure of diversion tunnel outlet opposite-bank road side slope and construction method thereof | |
| CN210975839U (en) | Narrow and small area underground structure supporting construction guiding device | |
| CN214401844U (en) | Gravity type cofferdam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220304 |
|
| WW01 | Invention patent application withdrawn after publication |