CN111577980A - Nondestructive protection construction method and structure for foundation pit excavation pipeline of linear engineering in old city - Google Patents
Nondestructive protection construction method and structure for foundation pit excavation pipeline of linear engineering in old city Download PDFInfo
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- CN111577980A CN111577980A CN202010305380.5A CN202010305380A CN111577980A CN 111577980 A CN111577980 A CN 111577980A CN 202010305380 A CN202010305380 A CN 202010305380A CN 111577980 A CN111577980 A CN 111577980A
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- pipeline
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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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
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0006—Plastics
- E02D2300/0007—PVC
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Foundations (AREA)
Abstract
The invention relates to a nondestructive protection construction method and a nondestructive protection construction structure for a foundation pit excavation pipeline of linear engineering in an old urban area. Under the condition that the pipeline is not required to be moved and changed and the use of the pipeline is not influenced, safe construction operation can be carried out at the periphery of a pipeline dense area.
Description
Technical Field
The invention belongs to the field of civil engineering foundation pit construction, and particularly relates to a nondestructive protection construction method and structure for a foundation pit excavation pipeline of linear engineering in an old city area.
Technical Field
When the linear engineering foundation pit open cut construction in old city district, because underground pipeline can't move and change, must suspend the protection to the pipeline in midair. For the case that the foundation pit is wide, the pipeline cannot be supported on two sides of the foundation pit by the weight of the pipeline, and the pipeline in the foundation pit sinks to possibly damage the pipeline. The pipeline is easy to deform due to the conventional protection method, so that the pipeline sinks, the pipeline is broken and damaged, and the related safety problem of a foundation pit is caused. In order to avoid influencing the life of surrounding residents, a method for carrying out nondestructive protection on pipelines aiming at excavation of foundation pits is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method and a structure for nondestructive protection of the pipeline for excavation of the linear engineering foundation pit in the old city area, which can effectively solve the safety of the pipeline.
In order to achieve the aim, the invention provides a nondestructive protection construction method for a foundation pit excavation pipeline of linear engineering in an old city area, which comprises the following steps:
a. pipeline ditch probing excavation:
manually excavating a foundation pit to completely expose the pipeline;
b. and (3) constructing an inner pipeline protection structure of the foundation pit:
pouring reinforced concrete foundations on two sides of the top of the foundation pit, arranging a suspension beam parallel to the pipeline above the pipeline, fixing two ends of the suspension beam on the foundations on two sides of the foundation pit, then wrapping a flame-retardant layer outside the pipeline, arranging a support frame support matched with the exposed length of the pipeline below the pipeline, arranging the support frame along the length direction of the pipeline, and fixing the support frame on the suspension beam through a hanger rod in a hanging manner;
c. backfilling and recovering at the pipeline:
and backfilling the foundation pit by adopting graded sand and pebbles.
According to the method, various pipelines encountered in the construction process of the old urban area are protected in a nondestructive mode by arranging the pipeline protection structure under the condition that the pipelines are not required to be moved and changed and the use of the pipelines is not influenced, the construction operation at the periphery of the pipeline dense area is guaranteed, and the condition that the lives of surrounding residents are influenced by the breakage of the pipelines is prevented.
In the above embodiment, in step b, two i-beams are arranged in parallel on two sides of the pipeline to form the suspension beam.
In the above embodiment, the length of the support of the two support ends of the i-steel on the foundation pit basis is not less than 1m, a steel plate with the thickness of 12mm is pre-embedded on the contact surface of the two support ends of the i-steel on the foundation pit basis, and the i-steel is fixed on the steel plate of the foundation pit basis by the support ends of the i-steel through chemical anchor bolts.
In the above embodiment, in the step b, the support frame is formed by a plurality of uniformly spaced channel beams as cross beams, and the adjacent cross beams are connected by welding longitudinal beams.
In the above embodiment, in step b, the weight of each linear meter of the pipeline is calculated according to the diameter and material of the exposed pipeline and the length of the exposed pipeline crossing the foundation pit, and the applicable i-steel type and channel steel type are selected according to the weight of the pipeline and finite element analysis, so as to calculate the distance between the crossbeams.
In the above embodiment, the support frame is paved with an anticorrosion sleeper, the pipeline is supported on the anticorrosion sleeper, and the pipeline is sleeved with a PVC pipe for protection.
In the above embodiment, before the backfilling in step c, the protection device is provided with a monitoring point for detecting the vertical displacement of the pipeline.
Another embodiment of this application, a pipeline protection architecture in foundation ditch, including set up the top of pipeline with the pipeline parallel roof beam that suspends in midair, suspend in midair the both ends of roof beam and fix on the basis of foundation ditch both sides, pipeline below is supported on exposing length assorted support frame with the pipeline, the support frame is laid along pipeline length direction, the support frame hangs through the jib and fixes on suspending in midair the roof beam.
In the above embodiment, the suspension beam is composed of two i-beams arranged in parallel at two sides of the pipeline, the length of the support of the two support ends of the i-beam on the foundation pit basis is not less than 1m, a steel plate is pre-embedded on the contact surface of the two support ends of the i-beam on the foundation pit basis, and the i-beam is fixed on the steel plate on the foundation pit basis by the support ends of the i-beam through chemical anchor bolts.
In the above embodiment, the support frame is formed by a plurality of uniformly spaced channel beams as cross beams, and the adjacent cross beams are connected by welding longitudinal beams.
By adopting the method and the structure, the method and the structure can be widely applied to the foundation pit construction for developing the underground space of the urban area. The pipeline protection structure in the foundation pit is reasonable in support stress, large in rigidity, small in deformation, simple in pipeline nondestructive construction, easy to machine, convenient to install and dismantle, and capable of being repeatedly used in a turnover mode.
In conclusion, under the condition that the pipeline is not required to be moved and changed and the use of the pipeline is not influenced, the safe construction operation is carried out around the dense pipeline area by applying the nondestructive protection construction method for the pipeline of the linear engineering foundation pit excavation in the old city area. The pipeline nondestructive protection support has the advantages of simplicity, light weight, strong operability, high safety, repeated turnover use and nondestructive protection construction on pipelines. The invention can be widely applied to the foundation pit construction in urban underground space development.
Drawings
Fig. 1 is a schematic structural diagram of an inner pipeline protection structure of a foundation pit after excavation of the foundation pit.
Fig. 2 is a cross-sectional view of a line protection structure within a foundation pit.
In the attached drawings, 1, a pipeline, 2, a foundation pit inner pipeline protection structure, 21, I-shaped steel, 22, a suspender, 23, a beam, 24, a longitudinal beam, 25, an anti-corrosion sleeper, 3, a foundation pit foundation, 4, a steel plate, 5 and a chemical anchor bolt.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Example 1:
as shown in fig. 1 and 2, the pipeline protection structure 2 in the foundation pit comprises a suspension beam which is arranged above a pipeline 1 and is parallel to the pipeline, two ends of the suspension beam are fixed on the basis of two sides of the foundation pit, the lower part of the pipeline 1 is supported on a support frame matched with the exposed length of the pipeline, the support frame is arranged along the length direction of the pipeline, and the support frame is suspended and fixed on the suspension beam through a suspension rod.
The suspension beam is composed of two I-beams 21 which are arranged on two sides of the pipeline in parallel, the length of the supports of the two support ends of the I-beams 21 on the foundation pit foundation 3 is not less than 1m, a steel plate 4 is pre-embedded on the contact surface of the two support ends of the I-beams 21 on the foundation pit foundation 3 and the I-beams 21, and the support ends of the I-beams 21 fix the I-beams on the steel plate of the foundation pit foundation through chemical anchor bolts 5.
The support frame comprises a plurality of evenly spaced channel-section steels as crossbeam 23, and the welding longeron is connected between adjacent crossbeam 23.
Example 2:
the method comprises the following steps:
(1) and (3) exploring and excavating construction of a pipeline 1:
before the pipeline 1 is constructed in a nondestructive protection mode, according to the pipe network diagram provided by an ownership unit and the site designated position of an ownership department worker, a detection ditch is excavated manually, and the pipeline 1 is located at the position of a foundation pit and is completely exposed. If the position of the underground pipeline 1 is unknown, the position is required to be vertically arranged in a foundation pit and manually excavated to 2.5m during excavation so as to ensure whether the underground pipeline 1 exists and ensure the safety and the construction safety of the pipeline 1.
(2) And (3) constructing an inner pipeline protection structure of the foundation pit:
before the construction of the pipeline protection structure in the foundation pit, the weight of each type of pipeline 1 is calculated according to the diameter and the material of the exposed pipeline 1 and the length of the crossed foundation pit, and the 21 model number of the I-steel and the 21 model number of the channel steel which can bear the corresponding weight are selected. The selected materials are adopted, the displacement and bending moment conditions borne by the pipeline 1 weight of the pipeline 1 in the foundation pit are calculated through midas civil software, whether the I-steel 21 and the channel steel type number meet the bearing total requirement or not is verified, the distance between the cross beams 23 is calculated, and the pipeline 1 protection structure in the foundation pit can bear the weight of the pipeline 1.
Then, a reinforced concrete foundation pit foundation 3 with the length of 50cm, the width of 50cm and the depth of 50cm is poured on two sides of the top of the foundation pit, the concrete strength is C35, a steel plate with the thickness of 12mm is pre-buried on the top surface of the concrete foundation pit, I-shaped steel 21 stretches across the foundation pit, the I-shaped steel 21 and the foundation pit foundation 3 are combined together through chemical bolts 5, and the I-shaped steel 21 serves as a main bearing structure. The supporting length of the two ends of the I-shaped steel 21 is 1 m. The bottom of the suspended pipeline 1 is supported by using uniformly spaced channel steel as cross beams 23, the adjacent cross beams 23 are connected through longitudinal beams 24, the cross beams 23 are reliably fixed on the I-shaped steel 21 through the channel steel as suspension rods 22, and the suspension rods 22 and the I-shaped steel 21 are fixed by bolts in the embodiment; the end part of the longitudinal beam 24 is provided with a steel plate and is anchored on a concrete foundation by adopting a chemical bolt, an anticorrosion sleeper 25 is arranged on the cross beam, the pipeline 1 is supported on the anticorrosion sleeper 25, the pipeline 1 is wrapped with a flame-retardant straw curtain to form wrapping protection, and two sides and the upper part of the pipeline 1 are also provided with a layer of wood boards to form wood box wrapping protection.
In order to prevent collision during construction, the four sides of the pipeline protection structure in the foundation pit are bound by steel wire meshes to form a package after the pipeline protection structure is installed; brushing yellow and black paint on the I-shaped steel 21, the channel steel, the angle iron and the steel wire mesh to serve as warning colors, wherein the distance between the paint is 20cm, and arranging a safety warning board;
(5) setting monitoring points:
set up displacement sensor as the monitoring point on the interior pipeline protection structure of foundation ditch, measure once every 2 days, be used for monitoring interior pipeline protection structure vertical displacement of foundation ditch, guarantee pipeline 1 safety.
(6) Pipeline 1 recovery and backfill:
after construction is completed, the wooden box is removed, the on-site pipeline 1 is protected by being wrapped by a PVC pipe, the PVC pipe notch 1/4 or 1/2 is connected and sealed by glass cement after being sleeved into the pipeline 1, sundries are prevented from entering the pipeline 1, and graded sand pebbles are backfilled without being rolled and compacted by a large machine so as to avoid damaging the pipeline 1.
Claims (10)
1. A non-destructive protection construction method for a foundation pit excavation pipeline of a linear engineering in an old city is characterized by comprising the following steps:
a. pipeline ditch probing excavation:
manually excavating a foundation pit to completely expose the pipeline;
b. and (3) constructing an inner pipeline protection structure of the foundation pit:
pouring reinforced concrete foundations on two sides of the top of the foundation pit, arranging a suspension beam parallel to the pipeline above the pipeline, fixing two ends of the suspension beam on the foundations on two sides of the foundation pit, then wrapping a flame-retardant layer outside the pipeline, arranging a support frame support matched with the exposed length of the pipeline below the pipeline, arranging the support frame along the length direction of the pipeline, and fixing the support frame on the suspension beam through a hanger rod in a hanging manner;
c. backfilling and recovering at the pipeline:
and after the construction is finished, backfilling the foundation pit by adopting graded sand and pebbles.
2. The non-destructive protection construction method for the excavation pipeline of the linear engineering foundation pit in the old city area according to claim 1, wherein in the step b, two I-shaped steels are arranged on two sides of the pipeline in parallel to form a suspension beam.
3. The non-destructive protection construction method for the excavation pipeline of the foundation pit of the linear engineering in the old city area according to claim 2, wherein the length of the support of the two supporting ends of the I-steel on the foundation pit foundation is not less than 1m, a steel plate is pre-embedded on the contact surface of the two supporting ends of the I-steel on the foundation pit foundation, and the I-steel is fixed on the steel plate of the foundation pit foundation by the supporting ends of the I-steel through chemical anchor bolts.
4. The non-destructive protection construction method for the excavation pipeline of the foundation pit of the linear engineering in the old city area according to claim 2, wherein in the step b, the support frame is formed by a plurality of uniformly spaced channel steel serving as cross beams, and the adjacent cross beams are connected by welding longitudinal beams.
5. The non-destructive construction method for the excavation pipeline of the foundation pit of the linear engineering in the old city area according to claim 4, wherein in the step b, the weight of the pipeline per linear meter is calculated according to the diameter and the material of the exposed pipeline and the length of the exposed pipeline crossing the foundation pit, and the applicable I-steel type and channel steel type are selected according to the weight of the pipeline and finite element analysis, so that the distance between the cross beams is calculated.
6. The nondestructive protection construction method for the excavation pipeline of the linear engineering foundation pit in the old city area according to claim 1, wherein an anticorrosion sleeper is paved on the support frame, the pipeline is supported on the anticorrosion sleeper, and a PVC pipe for protection is sleeved outside the pipeline.
7. The non-destructive construction method for the excavation pipeline of the linear engineering foundation pit in the old city area according to any one of claims 2 to 6, wherein a monitoring point for detecting the vertical displacement of the pipeline is arranged on the suspension beam before backfilling in the step c.
8. The utility model provides a pipeline protection architecture in foundation ditch which characterized in that: the pipeline hanging device comprises a hanging beam which is arranged above a pipeline and is parallel to the pipeline, the two ends of the hanging beam are fixed on the basis of the two sides of a foundation pit, the lower part of the pipeline is supported on a supporting frame matched with the exposed length of the pipeline, the supporting frame is arranged along the length direction of the pipeline, and the supporting frame is hung and fixed on the hanging beam through a hanging rod.
9. The structure for protecting pipelines in a foundation pit according to claim 8, wherein the suspension beam is composed of two I-beams arranged in parallel at two sides of the pipeline, the length of the support of two support ends of the I-beams on the foundation pit foundation is not less than 1m, a steel plate is embedded on the contact surface of the I-beams on the foundation pit foundation, and the I-beams are fixed on the steel plate of the foundation pit foundation by the support ends of the I-beams through chemical anchor bolts.
10. The pipeline protection structure in a foundation pit according to claim 8, wherein the support frame is composed of a plurality of uniformly spaced channel steel as cross beams, and the adjacent cross beams are connected by welding longitudinal beams.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010305380.5A CN111577980A (en) | 2020-04-17 | 2020-04-17 | Nondestructive protection construction method and structure for foundation pit excavation pipeline of linear engineering in old city |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010305380.5A CN111577980A (en) | 2020-04-17 | 2020-04-17 | Nondestructive protection construction method and structure for foundation pit excavation pipeline of linear engineering in old city |
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| CN111577980A true CN111577980A (en) | 2020-08-25 |
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| CN202010305380.5A Pending CN111577980A (en) | 2020-04-17 | 2020-04-17 | Nondestructive protection construction method and structure for foundation pit excavation pipeline of linear engineering in old city |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112324990A (en) * | 2020-10-29 | 2021-02-05 | 中国三冶集团有限公司 | Method and structure for reinforcing underground straight buried pipe |
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| CN109629576A (en) * | 2018-12-29 | 2019-04-16 | 杭州江润科技有限公司 | Cross foundation pit feed pipe suspension protection system and construction method |
| CN109972623A (en) * | 2019-03-22 | 2019-07-05 | 陕西铁路工程职业技术学院 | A kind of construction method and device carrying out pipeline suspension using Bailey beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201590633U (en) * | 2009-12-24 | 2010-09-22 | 贵阳铝镁设计研究院 | Bus-suspending simple bracket |
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| CN104652418A (en) * | 2014-12-24 | 2015-05-27 | 广州机施建设集团有限公司 | Continuous wall underground pipeline position construction method |
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| CN109629576A (en) * | 2018-12-29 | 2019-04-16 | 杭州江润科技有限公司 | Cross foundation pit feed pipe suspension protection system and construction method |
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| CN112324990A (en) * | 2020-10-29 | 2021-02-05 | 中国三冶集团有限公司 | Method and structure for reinforcing underground straight buried pipe |
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Application publication date: 20200825 |