CN107940102B - Underground raw water pipeline protection construction method - Google Patents
Underground raw water pipeline protection construction method Download PDFInfo
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- CN107940102B CN107940102B CN201711163103.XA CN201711163103A CN107940102B CN 107940102 B CN107940102 B CN 107940102B CN 201711163103 A CN201711163103 A CN 201711163103A CN 107940102 B CN107940102 B CN 107940102B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
- F16L1/11—Accessories therefor, e.g. anchors for the detection or protection of pipes in the ground
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention relates to a method for protecting and constructing a raw water pipeline under the ground, and belongs to the technical field of underground engineering construction. According to the construction method, reinforced soil is formed around the raw water pipeline through the jet grouting piles, a row of steel sheet piles are respectively arranged on two sides of the raw water pipeline to separate the reinforced soil from soil outside the steel sheet piles, and the soil above and beside the raw water pipeline is excavated in a partitioning mode, and the bottom plate is poured in a partitioning mode, so that the problem that the raw water pipeline floats upwards due to soil unloading and the raw water pipeline bulges due to the dead weight of surrounding soil is effectively prevented, and the deformation of the raw water pipeline is strictly controlled within the range of standard requirements.
Description
Technical Field
The invention relates to a method for protecting and constructing a raw water pipeline under the ground, and belongs to the technical field of underground engineering construction.
Background
With the rapid development of cities, the number of underground projects is increasing, and the situation of crossing or partially overlapping with inherent pipelines of the cities is often encountered in the construction process. For example, long lines of subway tunnels in cities are continuously constructed, and must intersect with the inherent pipelines of the cities. Most urban inherent pipelines are related to the normal work and life of surrounding enterprises and institutions and residents, so that the normal operation of pipelines is important in construction.
In the urban inherent pipelines, the raw water pipeline is an important water supply pipeline which can not be interrupted in urban resident life, the protection standard is more strict, and the deformation control standard is as follows according to the protection requirement of the raw water pipeline: the maximum sedimentation and the bulge quantity are less than or equal to 5mm; the differential deformation at the joint is less than or equal to 2.5mm. And the diameter of the raw water pipeline is larger (2-4 meters in general), so that the protection process is more difficult.
In the subway tunnel construction process, the main factors affecting the raw water pipe are soil rebound and floating generated by foundation pit excavation. After the foundation pit excavation is completed, the deformation of the bottom surface of the foundation pit mainly comprises two parts: part is the amount of rebound due to unloading after excavation; the other part is the amount of upward bulge of the soil around the foundation pit under the action of dead weight. The soil body rebound or the soil body floating can generate pressure on the side surface and the bottom surface of the raw water pipe, so that the raw water pipe is deformed or displaced.
The existing pipeline protection technology is mostly provided with a pipe wrapping device or is used for reinforcing a pipeline after open excavation, but is not suitable for a raw water pipeline with a large diameter, so that a construction protection method for the raw water pipe with the large diameter is urgently needed.
Disclosure of Invention
The invention provides a construction method for protecting a large-diameter raw water pipeline, which aims at solving the problems that a construction scheme for reinforcing the pipeline after a pipe wrapping device or open excavation is arranged in the prior pipeline protection technology is not suitable for protecting the raw water pipeline with a large deformation requirement.
In order to solve the technical problems, the invention comprises the following technical scheme:
a construction method for protecting a raw water pipeline in the ground comprises the following steps:
s1, performing jet grouting pile construction, reinforcing soil around a raw water pipeline, enabling the raw water pipeline to be covered by reinforcing soil, monitoring deformation data of the raw water pipeline in real time during jet grouting reinforcement construction, and timely adjusting the flow direction of jet grouting slurry, the soil replacement rate and the construction rate;
s2, soil body slotting is respectively carried out on two sides of the raw water pipeline with the horizontal distance of L, so that a notch is formed;
s3, continuously inserting a row of steel sheet piles at the bottom of the notch by adopting a static pile pressing machine;
s4, excavating soil body outside the notch, then constructing a first bottom plate in an excavation area, paving reinforcing steel bars of the first bottom plate, pouring concrete of the first bottom plate after standing up a mould, and enabling the reinforcing steel bars of the first bottom plate, which face the top of the steel sheet pile, to extend out of the end part of the first bottom plate;
s5, excavating soil between two notches, then constructing a second bottom plate in an excavation area, paving reinforcing steel bars of the second bottom plate, pouring concrete of the second bottom plate after erecting a mould, and enabling the reinforcing steel bars of the second bottom plate facing the top of the steel sheet pile to extend out of the end part of the second bottom plate;
s6, after the concrete of the second bottom plate reaches the design strength, the steel sheet pile is pulled out, the extending ends of the steel bars of the first bottom plate and the second bottom plate are welded together, and the concrete of the post-cast strip is poured, so that the first bottom plate, the second bottom plate and the post-cast strip form an integral structure.
Preferably, in step S1, a distance between the raw water pipeline and the reinforced soil at both sides is at least 0.5m, and a distance between the raw water pipeline and the reinforced soil at the top is at least 1m.
Preferably, in step S1, the thickness of the reinforced soil below the raw water pipeline is 2m or more.
Preferably, in the step S2, L is more than or equal to 15m; and slope laying excavation is adopted during slotting, and the slope ratio is less than or equal to 1:1.25; the width of the bottom of the notch is more than or equal to 0.6m.
Preferably, in step S3, a saddle joint is adopted between the adjacent steel sheet piles.
Preferably, the elevation of the top of the steel plate pile is the bottom elevation of the first bottom plate and the second bottom plate.
Preferably, the extending ends of the reinforcing steel bars of the first bottom plate and the second bottom plate are welded at the top of the steel sheet pile, and the steel sheet pile is temporarily fixed.
Compared with the prior art, the invention has the following advantages and positive effects due to the adoption of the technical scheme:
(1) The rotary jet piles are adopted to consolidate soil around the raw water pipeline, so that the dewatering measures which are necessarily adopted before the soil is dug in the traditional construction are eliminated, the condition that the raw water pipeline is upwards deviated due to the fact that the soil floats upwards in the dewatering process is avoided, meanwhile, the soil with good soil is consolidated, loads can be uniformly transmitted to the raw water pipeline, and the problem that local stress concentration is generated on the raw water pipeline in the construction process to cause larger deformation is avoided;
(2) The method is characterized in that 1 row of steel sheet piles are respectively arranged on two sides of the raw water pipe, reinforcing soil around the raw water pipe is isolated from soil below an excavation area outside the steel sheet piles, during and after excavation of soil above the side of the raw water pipe, the problem that the soil around the raw water pipe and the reinforcing soil are squeezed and expanded to the periphery due to unloading is avoided, the problem of deformation of rebound of the soil can be well solved by arranging the steel sheet piles and the reinforcing soil, the inherent shape of the soil around the raw water pipe is ensured, and the influence of the raw water pipe caused by excavation of the soil above the side of the raw water pipe is reduced;
(3) The notch and the post-pouring belt are arranged, so that soil is excavated in a partitioned mode, the bottom plate is poured in a partitioned mode, earth excavation and bottom plate pouring construction can be guaranteed to be completed within a specified time, the influence on a raw water pipeline is reduced as much as possible, and meanwhile, the poured bottom plate can play a role in temporary support in time.
Drawings
Fig. 1 to 6 are reference diagrams of a method for protecting a raw water pipe under ground according to an embodiment of the present invention.
1-a raw water pipeline; 2-soil mass; 21-groove; 22-soil body above the side of the raw water pipeline; 23-soil body above the raw water pipeline; 3-reinforcing soil; 4-steel sheet piles; 5-a bottom plate; 51-first bottom plate; 52-a second bottom plate; 53-post-cast strip.
Detailed Description
The construction method for protecting the underground raw water pipeline provided by the invention is further described in detail below with reference to the attached drawings and specific embodiments. Advantages and features of the invention will become more apparent in conjunction with the following description and claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
Example 1
The invention provides a construction method for protecting a raw water pipeline under the ground, and the construction method is further described below with reference to fig. 1 to 6. The construction method comprises the following construction steps:
s1, referring to FIG. 1, performing jet grouting pile construction, and reinforcing soil 2 around a raw water pipeline 1 to enable reinforcing soil 3 to cover the raw water pipeline 1. During the rotary spraying reinforcement construction, the deformation data of the raw water pipeline 1 are monitored in real time, and the flow direction of the rotary spraying slurry, the replacement rate of the soil body 2 and the construction rate are adjusted in time.
During construction, the position of the raw water pipeline 1 is accurately surveyed according to a drawing, the reinforcing of the jet grouting piles is carried out in a certain area around the raw water pipeline 1, and the raw water pipeline 1 is wrapped in an omnibearing manner by utilizing the reinforcing soil 3. In order to prevent the reinforcement soil 3 from causing excessive pressure to the raw water pipe 1, it is necessary to further limit the distance between the reinforcement soil 3 and the raw water pipe 1, and it is preferable that the distance between the raw water pipe 1 and the reinforcement soil 3 on both sides is at least 0.5m and the distance between the reinforcement soil 3 on the top is at least 1m. That is, the raw water pipeline 1 is still wrapped with a layer of soil body 2 with a certain thickness, and then the soil body 3 is reinforced outwards.
In order to effectively protect the raw water pipe 1, the reinforcing soil 3 under the raw water pipe 1 should not be too thin, and it is preferable that the thickness of the reinforcing soil 3 under the raw water pipe 1 is 2m or more.
In order to prevent the deformation of the soil around the raw water pipe 1 due to the loss of groundwater, thereby causing the raw water pipe 1 to float upward, the region of the reinforced soil 3 is not subjected to precipitation treatment, and the soil 22 (see fig. 2) above the side of the raw water pipe is subjected to precipitation only in the region of the unreinforced periphery.
S2, referring to FIG. 2, soil body 2 slotting is carried out at the horizontal distance L on two sides of the raw water pipe, and a notch 21 is formed. In order to prevent the pressure of the soil body 2 from being reduced during grooving from greatly influencing the raw water pipeline 1, the horizontal distance between the notch 21 and the raw water pipeline 1 needs to be controlled, preferably L is more than or equal to 15m, and the horizontal distance between the bottom angle of the notch 21 and the raw water pipeline 1 is 20 meters by way of example. Meanwhile, in order to ensure the safety and stability of the notch 21, slope laying excavation is adopted during slotting, and the slope ratio is less than or equal to 1:1.25; to ensure sufficient construction space, the width of the bottom of the notch 21 is 0.6m or more, and most preferably, the width of the bottom of the notch 21 is 1m.
S3, referring to FIG. 3, a static pile pressing machine is adopted to continuously insert a row of steel sheet piles 4 at the bottom of the notch 21. Preferably, the adjacent steel sheet piles 4 are overlapped by a riding joint. The joint overlap joint has the advantage that the efficiency of construction is high for the welding, simultaneously, steel sheet pile 4 can also keep apart its both sides reinforced soil 3 well.
S4, excavating soil body 22 above the side of the raw water pipeline, paving steel bars of the first bottom plate 51 above the side of the raw water pipeline 1, standing a mould, pouring concrete of the first bottom plate 51, and enabling the steel bars of the first bottom plate 51 facing the top of the steel sheet pile 4 to extend out of the end part of the first bottom plate 51. The soil 22 above the side of the raw water pipeline is also called the soil outside the notch 21.
S5, excavating soil 23 above the raw water pipeline, paving steel bars of a second bottom plate 52 above the raw water pipeline 1, standing a mould, pouring concrete of the second bottom plate 52, and enabling the steel bars of the second bottom plate 52, which face the top of the steel sheet pile 4, to extend out of the end parts of the second bottom plate 52. The soil 23 above the raw water pipeline is also called the soil between the two notches 21.
S6, referring to FIG. 6, after the concrete of the second bottom plate 52 reaches the design strength, the steel sheet piles 4 are pulled out, the extending ends of the steel bars of the first bottom plate 51 and the second bottom plate 52 are welded together, and the concrete of the post-cast strip 53 is poured, so that the first bottom plate 51, the second bottom plate 52 and the post-cast strip 53 form the bottom plate 5 with an integral structure.
The bottom plate 5 may be a bottom plate in subway tunnel construction, or may be a bottom plate in other building construction.
Preferably, the top elevation of the steel sheet pile 4 is the bottom elevation of the first bottom plate 51 and the second bottom plate 52. Further, the extending ends of the reinforcing steel bars of the first base plate 51 and the second base plate 52 are temporarily welded at the top of the steel sheet pile 4, and the temporary fixing and supporting functions are achieved on the top of the steel sheet pile 4.
In summary, the construction method for protecting the underground raw water pipeline provided by the embodiment has the following advantages: (1) The soil body 2 around the raw water pipeline 1 is reinforced by adopting the jet grouting piles, the construction measure of dewatering in the traditional construction is canceled, the condition that the soil body 2 floats upwards due to the loss of water body in the dewatering process, so that the raw water pipeline 1 is deflected upwards is avoided, meanwhile, the good soil quality of the reinforced soil 3 is realized, the load can be uniformly transmitted to the raw water pipeline 1, and the problem that the raw water pipeline 1 is greatly deformed due to the local stress concentration in the construction process can be avoided; (2) The two sides of the raw water pipe are respectively provided with 1 row of steel sheet piles 4, the reinforced soil 3 around the raw water pipe 1 is isolated from the soil body 2 below the excavation area outside the steel sheet piles 4, during and after the excavation of the soil body 22 above the side of the raw water pipe, the phenomenon that the soil body 2 around the raw water pipe 1 and the reinforced soil 3 are squeezed and expanded to the periphery due to unloading is avoided, the problem of deformation of rebound of the soil body can be well solved by arranging the steel sheet piles 4 and the reinforced soil 3, the inherent shape of the soil body around the raw water pipe 1 is ensured, and the influence of the raw water pipe 1 caused by the excavation of the soil body 22 above the side of the raw water pipe is reduced; (3) The notch 21 and the post-pouring belt 53 are arranged, so that soil 2 is excavated in a partitioning mode and the bottom plate 5 is poured in a partitioning mode, earth excavation and bottom plate pouring construction can be guaranteed to be completed within a specified time, influence on the raw water pipeline 1 is reduced as much as possible, and meanwhile, the poured bottom plate can play a role in temporary support in time.
Example two
The present embodiment provides a groundwater pipeline protection structure, as shown in fig. 4, including reinforcement soil 3 coating a raw water pipeline 1 and steel sheet piles 4 disposed at both sides of the raw water pipeline 1. And performing jet grouting pile construction around the raw water pipeline 1 to form reinforced soil 3 coating the raw water pipeline 1. Steel sheet piles 4 are arranged in the reinforced soil 3 at two sides of the raw water pipeline.
The reinforced soil 3 has good soil property, can uniformly transfer load to the raw water pipeline 1, and can also avoid the large deformation of the raw water pipeline 1 caused by local stress concentration in the construction process. The steel sheet piles 4 are arranged to separate the reinforced soil 3 around the raw water pipeline 1 from the soil outside the steel sheet piles, so that the soil below the raw water pipeline can be prevented from lifting or sinking due to the load change of the soil at two sides of the steel sheet piles.
Preferably, the distance between the raw water pipe 1 and the reinforcing soil 3 on both sides is at least 0.5m, and the distance between the raw water pipe and the reinforcing soil 3 on the top is at least 1m. When the jet grouting pile is constructed, the raw water pipeline 1 is extruded, the distance between the raw water pipeline 1 and the reinforced soil 3 is limited, and the raw water pipeline 1 can be prevented from bearing excessive pressure. That is, the raw water pipeline 1 is still wrapped with a layer of soil body 2 with a certain thickness, and then the soil body 3 is reinforced outwards.
Preferably, the thickness of the reinforcement soil 3 below the raw water pipe 1 is 2m or more. The thickness of the reinforced soil 3 below the raw water pipeline 1 is ensured, and the raw water pipeline 1 can be effectively protected.
Preferably, the adjacent steel sheet piles are overlapped by a riding joint. The joint overlap joint has the advantage that the efficiency of construction is high for the welding, simultaneously, steel sheet pile 4 can also keep apart its both sides reinforced soil 3 well.
In summary, in the underground raw water pipeline protection structure provided by the embodiment, the reinforced soil 3 is formed around the raw water pipeline 1 through the construction of the jet grouting piles, and the raw water pipeline 1 is protected through the good soil property of the reinforced soil 3, and the reinforced soil 3 uniformly transmits the acting load to the raw water pipeline 1, so that the raw water pipeline 1 is effectively prevented from being greatly deformed due to the concentrated load; and steel sheet piles 4 are arranged in the reinforced soil 3 at two sides of the raw water pipeline 1, so that the reinforced soil 3 around the raw water pipeline 1 is separated from soil outside the steel sheet piles 4, and the influence of load change caused by soil excavation outside the steel sheet piles 4 on the raw water pipeline 1 is effectively avoided.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (7)
1. The underground raw water pipeline protection construction method is characterized by comprising the following steps of:
s1, performing jet grouting pile construction, reinforcing soil around a raw water pipeline, enabling the raw water pipeline to be covered by reinforcing soil, monitoring deformation data of the raw water pipeline in real time during jet grouting reinforcement construction, and timely adjusting the flow direction of jet grouting slurry, the soil replacement rate and the construction rate;
s2, soil body slotting is respectively carried out on two sides of the raw water pipeline with the horizontal distance of L, so that a notch is formed;
s3, continuously inserting a row of steel sheet piles at the bottom of the notch by adopting a static pile pressing machine;
s4, excavating soil body outside the notch, then constructing a first bottom plate in an excavation area, paving reinforcing steel bars of the first bottom plate, pouring concrete of the first bottom plate after standing up a mould, and enabling the reinforcing steel bars of the first bottom plate, which face the top of the steel sheet pile, to extend out of the end part of the first bottom plate;
s5, excavating soil between two notches, then constructing a second bottom plate in an excavation area, paving reinforcing steel bars of the second bottom plate, pouring concrete of the second bottom plate after erecting a mould, and enabling the reinforcing steel bars of the second bottom plate facing the top of the steel sheet pile to extend out of the end part of the second bottom plate;
s6, after the concrete of the second bottom plate reaches the design strength, the steel sheet pile is pulled out, the extending ends of the steel bars of the first bottom plate and the second bottom plate are welded together, and the concrete of the post-cast strip is poured, so that the first bottom plate, the second bottom plate and the post-cast strip form an integral structure.
2. The construction method according to claim 1, wherein in step S1, a distance between the raw water pipe and the reinforcing soil on both sides is at least 0.5m and a distance between the raw water pipe and the reinforcing soil on the top is at least 1m.
3. The construction method according to claim 1, wherein in step S1, a thickness of the reinforced soil below the raw water pipe is 2m or more.
4. The construction method according to claim 1, wherein in the step S2, L is not less than 15m; and slope laying excavation is adopted during slotting, and the slope ratio is less than or equal to 1:1.25; the width of the bottom of the notch is more than or equal to 0.6m.
5. The construction method according to claim 1, wherein in step S3, a seam overlapping is adopted between adjacent steel sheet piles.
6. The construction method according to claim 1, wherein the top elevation of the steel sheet pile is the bottom elevation of the first bottom plate and the second bottom plate.
7. The construction method according to claim 6, wherein the protruding ends of the reinforcing bars of the first and second base plates are welded to the top of the steel sheet pile, and the steel sheet pile is temporarily fixed.
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| CN201711163103.XA CN107940102B (en) | 2017-11-21 | 2017-11-21 | Underground raw water pipeline protection construction method |
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| CN201711163103.XA CN107940102B (en) | 2017-11-21 | 2017-11-21 | Underground raw water pipeline protection construction method |
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| CN109826230B (en) * | 2019-01-18 | 2021-03-30 | 南通市市政工程设计院有限责任公司 | Municipal road pipeline reinforcement protection structure and construction method thereof |
| CN111042145B (en) * | 2020-01-02 | 2022-03-11 | 中国水利水电第八工程局有限公司 | Construction method for excavating foundation pit near deep-buried large-diameter pipeline |
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