CN112376672B - Pipeline side settlement prevention system for soft soil foundation and construction method - Google Patents
Pipeline side settlement prevention system for soft soil foundation and construction method Download PDFInfo
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- CN112376672B CN112376672B CN202011251428.5A CN202011251428A CN112376672B CN 112376672 B CN112376672 B CN 112376672B CN 202011251428 A CN202011251428 A CN 202011251428A CN 112376672 B CN112376672 B CN 112376672B
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- pipeline
- soft soil
- concrete
- pile
- foundation
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/06—Methods of, or installations for, laying sewer pipes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/46—Foundations for supply conduits or other canals
Abstract
The invention discloses a pipeline side settlement prevention system for a soft soil foundation and a construction method thereof. The concrete cushion plate has certain strength and rigidity, one end of the concrete cushion plate is fixed on the structure, uneven settlement of the soft soil foundation pipeline and the structure can be coordinated by means of the strength and the rigidity of the concrete cushion plate, and the problems of flexural joint damage, pipeline tension fracture, water leakage and the like of the pipeline at the joint of the pipeline and the structure due to the settlement difference can be effectively prevented.
Description
Technical Field
The invention relates to a pipeline side settlement prevention system for a soft soil foundation and a pipeline side settlement prevention construction method for the soft soil foundation.
Background
The structures of sewage treatment plants in soft soil foundation areas often adopt pile foundations and almost have no settlement, while pipelines connected to the structures generally adopt gravel foundations, and the pipelines have more settlement due to incompact backfill or settlement of soft soil, so that obvious uneven settlement exists between the pipelines and the structures. More engineering experience shows that the joint of the pipeline and the structure is prone to the problems of flexural joint tearing, pipeline pulling crack, water leakage and the like due to uneven settlement, the normal operation of a sewage treatment plant is seriously influenced, and the production stop and overflow of the sewage treatment plant are caused in serious cases.
Disclosure of Invention
The invention aims to overcome the defects that a bent joint is easy to tear, a pipeline is easy to pull apart and water leakage is easy to occur due to uneven settlement at the joint of a pipeline and a structure in the prior art, and provides a pipeline side settlement prevention system for a soft soil foundation and a construction method.
The invention solves the technical problems through the following technical scheme:
a pipeline side settlement prevention system for a soft soil foundation, comprising:
a pipeline;
one end of the pipeline penetrates through and is fixed on the structure pool wall;
one end of the structure bottom plate extends out of the outer surface of the structure pool wall and forms a cantilever foot;
the concrete cushion plate is positioned right below the pipeline, and one end of the concrete cushion plate is fixed to the cantilever; and
a sand foundation located above the concrete pad.
In the scheme, the concrete cushion plate has certain strength and rigidity, one end of the concrete cushion plate is fixed on a structure, uneven settlement of the soft soil foundation pipeline and the structure can be coordinated by means of the strength and the rigidity of the concrete cushion plate, and the sand foundation is arranged on the concrete cushion plate, so that the stress of the process pipeline is not influenced. The scheme has the advantages of simple structure and convenient construction, effectively prevents the problems of flexural joint damage, pipeline tension crack, water leakage and the like of the pipeline at the joint of the pipeline and the structure due to poor settlement, solves the problem of joint damage of the pipeline and the structure, and ensures the operation safety of a sewage plant.
Preferably, the pipeline side settlement prevention system for the soft soil foundation further comprises a fixing piece, one end of the concrete cushion plate is lapped on the outrigger, one end of the fixing piece is fixed on the concrete cushion plate, and the other end of the fixing piece is fixed on the outrigger.
In the scheme, the concrete cushion plate is fixed on the cantilever foot of the structure bottom plate through the fixing piece so as to prevent falling off.
Preferably, the fixing member is a reinforcing bar.
In this scheme, the reinforcing bar can bear external force better to the reinforcing bar is as the mounting, makes more firm fixed between concrete pad and the outrigger.
Preferably, the thickness of the concrete pad is 300 mm;
and/or the length of the concrete pad is greater than 2.5 meters or greater than twice the pipe diameter.
Preferably, the pipe side settlement prevention system for soft soil foundations further comprises a pile member, the bottom of which is inserted into the soil, and the top of which extends up to the bottom surface of the tie plate.
In this scheme, for poor ground formations such as mucky soil, recently filled soil, etc., pile members are provided to form a composite foundation of gradually changing rigidity, which supports a concrete pad by the pile members, so that uneven settlement between the structure and the pipeline can be reduced also under poor geological conditions.
Preferably, the pipeline side settlement prevention system for the soft soil foundation further comprises a medium grit cushion layer, the medium grit cushion layer is located below the concrete cushion plate, the top of the pile member penetrates through the medium grit cushion layer, and the medium grit cushion layer can enable the pile member to be stressed uniformly.
In this scheme, for the composite foundation that sets up pile component formation, need set up well coarse sand bed course.
Preferably, the pile member is selected from one of a cement mixing pile, a jet grouting pile and a pine pile.
In the scheme, the three pile members can improve the bearing capacity of the foundation, so that the uneven settlement between the structure and the pipeline can be reduced under the unfavorable geological condition. Preferably, the concrete pad is bound by reinforcing bars and cast by concrete.
In the scheme, the structural form is adopted, so that the strength and the rigidity of the concrete cushion plate are enhanced, and the uneven settlement between the structure and the pipeline is better prevented.
A pipeline side settlement prevention construction method for a soft soil foundation comprises the following steps:
s10, lofting the pipeline groove;
s20, excavating a groove;
s30, fixing one end of the concrete cushion plate on a cantilever foot of the bottom plate of the structure;
s40, laying a pipeline, enabling one end of the pipeline to penetrate through and be fixed on the wall of the structure pool, and enabling the pipeline to be located right above the concrete cushion plate;
s50, backfilling the pipeline foundation to form a sand foundation, and paving the sand foundation above the concrete cushion plate;
and S60, backfilling the upper groove with plain soil.
According to the construction method for preventing the pipeline side settlement of the soft soil foundation, the uneven settlement of the soft soil foundation pipeline and the structure can be coordinated, the construction is simple, the construction is convenient, the problems of flexural joint damage, pipeline tension crack, water leakage and the like of the pipeline at the joint of the pipeline and the structure due to the poor settlement are effectively prevented, the problem of damage of the joint of the pipeline and the structure is solved, and the operation safety of a sewage plant is ensured. Preferably, after the step S10, before the step S20, the method further comprises the following steps:
s11, inserting the bottom of the pile member into the soil to form a composite foundation;
after step S20, before step S30, the method further includes the steps of:
and S21, laying a medium coarse sand cushion layer in the groove, and enabling the top of the pile member to penetrate through the medium coarse sand cushion layer.
In this scheme, for poor ground formations such as mucky soil, recently filled soil, etc., pile members are provided to form a composite foundation of gradually changing rigidity, which supports a concrete pad by the pile members, so that uneven settlement between the structure and the pipeline can be reduced also under poor geological conditions. For the composite foundation formed by arranging the pile members, a medium-coarse sand cushion layer needs to be arranged. On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
for the pipeline side settlement prevention system for the soft soil foundation, the concrete cushion plate has certain strength and rigidity, one end of the concrete cushion plate is fixed on a structure, and the concrete cushion plate is not easy to deform when supporting the sand foundation and the pipeline by depending on the strength and the rigidity of the concrete cushion plate, so that uneven settlement of the pipeline and the structure of the soft soil foundation can be coordinated; the sand foundation is arranged on the concrete cushion plate, so that the stress of the process pipeline is not influenced. The scheme has the advantages of simple structure and convenient construction, effectively prevents the problems of flexural joint damage, pipeline tension crack, water leakage and the like of the pipeline at the joint of the pipeline and the structure due to poor settlement, solves the problem of joint damage of the pipeline and the structure, and ensures the operation safety of a sewage plant. Accordingly, the pipe side settlement prevention construction method for the soft soil foundation has the advantage of being capable of coordinating uneven settlement of the soft soil foundation pipes and the structures.
Drawings
Fig. 1 is a schematic structural view of a pipe side settlement prevention system for a soft soil base according to a preferred embodiment of the present invention.
Fig. 2 is a sectional view of a pipe side settlement preventing system for a soft soil base according to a preferred embodiment of the present invention, wherein the section is perpendicular to the extending direction of the pipe.
Fig. 3 is a further sectional view of the pipe side settlement preventing system for a soft soil base according to the preferred embodiment of the present invention, wherein the section is parallel to the extending direction of the pipe.
Fig. 4 is a flowchart of a pipe side settlement prevention construction method for a soft soil base according to a preferred embodiment of the present invention.
Description of the reference numerals
Pipe 1
Fixing member 6
Pile element 7
Medium coarse sand cushion 8
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
The embodiment discloses a pipeline side settlement prevention system for a soft soil foundation, as shown in fig. 1-3, the pipeline side settlement prevention system for the soft soil foundation comprises a pipeline 1, a structure pool wall 2, a structure bottom plate 3, a concrete cushion plate 4 and a sand foundation 5, one end of the pipeline 1 penetrates through and is fixed on the structure pool wall 2, the structure bottom plate 3 is fixed with the lower end of the structure pool wall 2, one end of the structure bottom plate 3 extends out of the outer surface of the structure pool wall 2 and forms a cantilever, the concrete cushion plate 4 is located right below the pipeline 1, one end of the concrete cushion plate 4 is fixed on the cantilever, and the sand foundation 5 is located above the concrete cushion plate 4.
In the embodiment, the concrete pad 4 has certain strength and rigidity, one end of the concrete pad is fixed on a structure, uneven settlement between the soft soil foundation pipeline 1 and the structure can be coordinated by means of the strength and the rigidity of the concrete pad, and the sand foundation 5 is arranged on the concrete pad 4, so that the stress of the process pipeline 1 is not influenced. The scheme has the advantages of simple structure and convenient construction, effectively prevents the problems of the damage of the flexible joint 11, the tensile crack and the water leakage of the pipeline 1 and the pipeline 1 at the joint of the pipeline 1 and the structure due to the poor settlement, solves the problem of the damage of the joint of the pipeline 1 and the structure, and ensures the safe operation of a sewage plant.
The soft soil foundation refers to a foundation consisting of silt, mucky soil, soft filling soil, miscellaneous filling soil or other high-compressibility soft soil layers, and the structures located in the soft soil foundation generally adopt pile foundations. The structure may be a sewage treatment plant building located on a soft soil foundation. The pipeline 1 may be a buried steel pipe, a cast iron pipe or a plastic pipe.
The concrete pad 4 is bound by reinforcing bars and cast with concrete. By adopting the structure form, the strength and the rigidity of the concrete cushion plate 4 are enhanced, and the uneven settlement between the structure and the pipeline 1 is better prevented.
The pipeline side settlement preventing system for the soft soil foundation further comprises a fixing piece 6, one end of the concrete cushion plate 4 is lapped on the cantilever foot, one end of the fixing piece 6 is fixed to the concrete cushion plate 4, and the other end of the fixing piece 6 is fixed to the cantilever foot. The concrete pad 4 is fixed to the outrigger of the structure floor 3 by the fixing member 6 to prevent the dropping. Specifically, the fixing member 6 is a reinforcing bar. The reinforcing bar can bear external force better to the reinforcing bar is as mounting 6 for fix more firmly between concrete cushion 4 and the outrigger.
Specifically, the thickness of the concrete pad 4 is 300 mm, the length of the concrete pad 4 is greater than 2.5 m or greater than twice the diameter of the pipe 1, and the width of the pad is the same as the width of the groove in which the pipe 1 is located.
The pipe side settlement prevention system for soft soil foundations further comprises a pile member 7, the bottom of the pile member 7 being inserted into the soil, the top of the pile member 7 extending up to the bottom surface of the tie plate. Wherein, for poor ground layers such as mucky soil, recently filled soil and the like, pile members 7 are provided to form a composite foundation of gradually changing rigidity, which supports concrete pad 4 by pile members 7, so that uneven settlement between the structure and pipeline 1 can be reduced also under poor geological conditions.
As shown in fig. 2 and 3, the pile members 7 are arranged in 2 or 3 rows in the width direction of the concrete pad 4, specifically, depending on the width of the concrete pad 4; the pile members 7 are arranged in 3 or 4 rows in the length direction of the concrete pad 4, specifically, depending on the length of the concrete pad 4. Wherein the length direction of the concrete pad 4 is the extending direction of the pipeline 1.
The pipeline side settlement prevention system for the soft soil foundation further comprises a medium coarse sand cushion layer 8, wherein the medium coarse sand cushion layer 8 is located below the concrete cushion plate 4, and the medium coarse sand cushion layer 8 is penetrated through the top of the pile member 7. To setting up the composite foundation that pile element 7 formed, need set up medium grit bed course 8, medium grit bed course can make pile element atress even, and medium grit bed course 8 is the same with the material of sand foundation.
The pile member 7 is one selected from a cement-soil mixing pile, a jet grouting pile, and a pine pile. The three pile elements 7 described above increase the bearing capacity of the foundation so that uneven settlement between the structure and the pipeline 1 can be reduced also in poor geological conditions.
The embodiment also discloses a construction method for preventing the pipeline side from sinking for the soft soil foundation, the pipeline side sinking prevention system for the soft soil foundation is obtained by the implementation method, and the construction method can be implemented by combining the pipeline side sinking prevention system for the soft soil foundation described in the figures 1-3.
The construction method for preventing the pipeline side from sinking for the soft soil foundation comprises the following steps:
s10, lofting the pipeline groove;
s20, performing groove excavation according to the lofting of the step S10;
s30, fixing one end of the concrete cushion plate 4 on a cantilever foot of the structure bottom plate 3;
s40, laying the pipeline 1, enabling one end of the pipeline 1 to penetrate through and be fixed on the wall 2 of the structure pool, and enabling the pipeline 1 to be positioned right above the concrete cushion plate 4;
s50, backfilling the pipeline with sand to form a sand foundation 5, and paving the sand foundation 5 above the concrete cushion plate 4;
and S60, backfilling the upper groove with plain soil.
In the embodiment, the construction method for preventing the pipeline side settlement of the soft soil foundation can coordinate the uneven settlement of the soft soil foundation pipeline 1 and the structure, has simple structure and convenient construction, effectively prevents the pipeline 1 at the joint of the pipeline 1 and the structure from being damaged by the flexural joint 11, the pipeline 1 from being pulled and leaking water and the like due to the settlement difference, solves the problem of the damage of the joint of the pipeline 1 and the structure, and ensures the operation safety of a sewage plant.
As shown in fig. 4, after step S10, before step S20, the following steps may be further included:
s11, inserting the bottom of the pile member 7 into the soil to form a composite foundation;
after step S20, before step S30, the method further includes the steps of:
s21, laying the medium-coarse sand cushion layer 8 in the groove, and making the top of the pile member 7 penetrate the medium-coarse sand cushion layer 8.
Wherein, for poor ground layers such as mucky soil, recently filled soil and the like, pile members 7 are provided to form a composite foundation of gradually changing rigidity, which supports concrete pad 4 by pile members 7, so that uneven settlement between the structure and pipeline 1 can be reduced also under poor geological conditions. For the composite foundation formed by the pile elements 7, a medium coarse sand cushion 8 is required.
It should be noted that, when a bad stratum requires foundation treatment, if the pile member 7 adopts a cement mixing pile or a jet grouting pile, the foundation should be pre-treated in trench excavation; the pile member 7 may be treated after trench excavation using pine piles.
For the cement mixing pile, the method for treating the foundation comprises the following steps: the diameter of the mixing pile is about 500mm, the pile top of the mixing pile extends to the bottom surface of the concrete backing plate 4, the part above the elevation of the pile top is subjected to air mixing, the mixing pile is constructed by adopting a four-mixing four-spraying slurry spraying method, the cement strength grade is 42.5, the cement infiltration ratio is 18%, the water cement ratio is 0.55-0.65, the mixing lifting speed is less than or equal to 0.80m/min, the verticality deviation is less than or equal to 1%, the pile position deviation is less than or equal to 50, the pore-forming diameter and the pile length are not less than the design values, the pile end enters a powder clay layer and is not less than 1.0m, and the non-lateral limit compressive strength mixing pile of 28 days of the pile body is not less than 0.8 MPa.
For the jet grouting pile, the method for treating the foundation comprises the following steps: the jet grouting pile adopts a single-pipe method or a double-pipe method, the diameter is 600mm, fresh ordinary portland cement with the strength grade of 42.5 is adopted, the water cement ratio is 0.7-1.0, the doping amount is not less than 25%, and the pressure of high-pressure cement paste is more than 20 MPa. The unconfined compressive strength of the reinforcing body is more than or equal to 1.0MPa within 28 days.
For the pine pile, the diameter of the pine pile is not less than 120, and the pine pile is generally about 6m long.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (9)
1. A pipeline side settlement prevention system for a soft soil foundation, comprising:
a pipeline;
one end of the pipeline penetrates through and is fixed on the structure pool wall;
one end of the structure bottom plate extends out of the outer surface of the structure pool wall and forms a cantilever foot;
the concrete cushion plate is positioned right below the pipeline, and one end of the concrete cushion plate is fixed to the cantilever; and
a sand foundation located above the concrete pad;
a pile member having a bottom inserted into the ground and a top extending up to a bottom surface of the backing plate.
2. The pipe side settlement prevention system for soft soil foundations as claimed in claim 1, further comprising a fixing member, one end of said concrete pad being lapped on said outrigger, one end of said fixing member being fixed to said concrete pad, and the other end of said fixing member being fixed to said outrigger.
3. The pipe side settlement prevention system for soft soil foundations of claim 2 wherein the fasteners are steel bars.
4. The pipe side settlement prevention system for soft soil foundations of claim 1 wherein the concrete pad has a thickness of 300 mm;
and/or the length of the concrete pad is greater than 2.5 meters or greater than twice the pipe diameter.
5. The pipe side settlement prevention system for soft soil foundations of claim 4 further comprising a medium grit cushion layer below the concrete pad, the top of the pile member penetrating the medium grit cushion layer.
6. The pipe side settlement prevention system for soft soil foundations of claim 5 wherein the pile member is selected from one of a cement mixing pile, a jet grouting pile and a pine pile.
7. A pipe side settlement prevention system for soft soil foundations as claimed in any one of claims 1 to 6 wherein the concrete pad is tied with steel reinforcement and cast with concrete.
8. A pipeline side settlement prevention construction method for a soft soil foundation is characterized by comprising the following steps:
s10, lofting the pipeline groove;
s11, inserting the bottom of the pile member into the soil to form a composite foundation;
s20, excavating a groove;
s30, fixing one end of the concrete cushion plate on a cantilever foot of the bottom plate of the structure;
s40, laying a pipeline, enabling one end of the pipeline to penetrate through and be fixed on the wall of the structure pool, and enabling the pipeline to be located right above the concrete cushion plate;
s50, backfilling the pipeline with sand to form a sand foundation, and paving the sand foundation above the concrete cushion plate;
and S60, backfilling the upper groove with plain soil.
9. The pipe side settlement preventing construction method for soft soil foundations as claimed in claim 8,
after step S20, before step S30, the method further includes the steps of:
and S21, laying a medium coarse sand cushion layer in the groove, and enabling the top of the pile member to penetrate through the medium coarse sand cushion layer.
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| CN202011251428.5A CN112376672B (en) | 2020-11-09 | 2020-11-09 | Pipeline side settlement prevention system for soft soil foundation and construction method |
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| CN202011251428.5A CN112376672B (en) | 2020-11-09 | 2020-11-09 | Pipeline side settlement prevention system for soft soil foundation and construction method |
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| CN112376672B true CN112376672B (en) | 2022-04-26 |
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| CN114658082A (en) * | 2022-04-25 | 2022-06-24 | 中国十七冶集团有限公司 | Foundation construction method for water supply and drainage pipeline in high backfill region outside small compartment |
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| JPS59220530A (en) * | 1983-05-31 | 1984-12-12 | Nippon Kokan Kk <Nkk> | Ground subsidence prevention work in buried pipeline |
| CN201485956U (en) * | 2009-08-20 | 2010-05-26 | 广东省第二建筑工程公司 | Inspection well |
| CN111535357A (en) * | 2020-05-21 | 2020-08-14 | 广东水利电力职业技术学院（广东省水利电力技工学校） | Water intake pipeline structure penetrating through soft foundation dike below flood level and construction method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207362861U (en) * | 2017-09-12 | 2018-05-15 | 上海建工集团股份有限公司 | A kind of soft base support of pipe gallery |
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2020
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|---|---|---|---|---|
| JPS59220530A (en) * | 1983-05-31 | 1984-12-12 | Nippon Kokan Kk <Nkk> | Ground subsidence prevention work in buried pipeline |
| CN201485956U (en) * | 2009-08-20 | 2010-05-26 | 广东省第二建筑工程公司 | Inspection well |
| CN111535357A (en) * | 2020-05-21 | 2020-08-14 | 广东水利电力职业技术学院（广东省水利电力技工学校） | Water intake pipeline structure penetrating through soft foundation dike below flood level and construction method |
Non-Patent Citations (2)
| Title |
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| 某机房室外埋地管道沉降处理;傅伟炎等;《广东建材》;20160315(第03期);第66-68页 * |
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