CN106320368A - Construction method applicable to open-excavation pipeline at compound stratum - Google Patents

Construction method applicable to open-excavation pipeline at compound stratum Download PDF

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Publication number
CN106320368A
CN106320368A CN201610695867.2A CN201610695867A CN106320368A CN 106320368 A CN106320368 A CN 106320368A CN 201610695867 A CN201610695867 A CN 201610695867A CN 106320368 A CN106320368 A CN 106320368A
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CN
China
Prior art keywords
excavation
pipeline
layer
construction method
soil
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Application number
CN201610695867.2A
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Chinese (zh)
Inventor
崔立志
姚亚军
王婧馨
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中铁四局集团有限公司
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Priority to CN201610695867.2A priority Critical patent/CN106320368A/en
Publication of CN106320368A publication Critical patent/CN106320368A/en

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/10Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells

Abstract

The invention relates to the field of building construction, in particular to a construction method applicable to an open-excavation pipeline at a compound stratum. The construction method comprises the following steps of measuring and lining, changing and filling of mixture in excavation lines on two sides of an excavation ditch, upper soil layer slope excavation, lower part rock layer slope excavating, changing and filling of sand and gravel in the bottom of the foundation pit of the excavation ditch, pipeline assembling and medium-coarse sand and earthwork backfilling; a blind cofferdam construction method is adopted; upper part soil layers on the two sides of the ditch are changed and filled with cement and plain soil mixture which is mixed in advance; a blind cofferdam is formed through layered compacting so that a water stop effect is reached; net hanging and anchor ejecting are performed on slopes during a ditch excavation process; and a lower part rock layer is removed through a breaking hammer. The construction technique is simple; construction difficulty is low; requirement on mechanical equipment is low; a construction period is shortened; construction cost is reduced; and the construction method is safe and effective.

Description

A kind of construction method being applicable to compound stratum open cut pipeline

Technical field

The present invention relates to the realm of building construction, be specifically related to deep foundation pit open cutting pipeline under the conditions of rich water, ground compound stratum Construction method.

Background technology

Since reform and opening-up, China's politics, economy, the fast development of cultural undertakings, bring the climax of urban construction, During municipal drainage, rain waste water control, underground piping, the construction of piping lane, become a developing direction.To this end, intricately Under the conditions of matter, deep foundation pit open cutting pipeline construction becomes the most frequent.How to guarantee deep basal pit under the conditions of rich water, ground complex geological During open cut pipeline construction, groove timbering, sealing become an emphasis and difficult point.At present through frequently with for Larsen steel sheet pile Supporting construction type.Hereinafter underdraw the weak point that Larsen steel sheet pile supporting construction exists:

Larsen steel sheet pile supporting is first injection Larsen steel sheet pile, and the embedded depth of its steel sheet pile and gash depth ratio cannot be less than 1: 1, after injection completes, earth excavation encloses purlin, bracing members to designing installation steel when steel encloses purlin position, is enclosed with steel at the two ends of bracing members Purlin firm welding, to reach the effect of support level load and sealing, but is bad soil layer and water outlet when running into groove top Greatly, in the case of bottom is the complex geological condition of weak weathered stratum, Larsen steel sheet pile cannot enter rock to amount, install steel enclose purlin, Rock stratum, bottom cannot be abolished with machinery after steel shotcrete support, can only use and manually abolish, so there is bigger potential safety hazard, only Water poor effect, causes the construction period long, and time cost is higher, directly affects economic benefit.

Summary of the invention

For the problems referred to above, the technical problem to be solved in the present invention is to utilize " dark cofferdam " method to carry out sealing, it is provided that a kind of It is applicable to deep foundation pit open cutting pipeline construction method under the conditions of rich water, ground compound stratum.

For reaching above-mentioned purpose, the present invention uses technical scheme as follows:

A kind of construction method being applicable to compound stratum open cut pipeline, comprises the following steps:

1) surveying setting-out: according to well location and the degree of depth of excavation groove of job site inspection shaft, measuring goes out to excavate groove both sides Cipangopaludina chinensis layer, 2 meters of wide excavation lines of liquefaction soil layers;

2) in the excavation line of excavation groove both sides, changing of mixture is filled out: according to excavation line excavation construction from top to bottom, first will excavation The soil layer of line internal upper part is excavated, then the Cipangopaludina chinensis layer of bottom, liquefaction soil layers is excavated;After Cipangopaludina chinensis layer, liquefaction soil layers are excavated, To stir the cement of preparation and the mixture back-filling in layers compacting of element soil in advance, every layer of thickness spread out and put on is 500-800 millimeter, often Layer uses excavator to roll after having paved, and then uses vibro-rammer compacting, and every layer of pass rolling and tamping is more than In 3-5 time;In described mixture, the quality of cement is 10%~15% with the wet mass ratio of element soil;

3) upper soil horizon puts slope excavation: the upper soil horizon in excavation groove puts slope excavation by gradient 1:0.5, to top soil after excavation The domatic mixed earth of linked network injection that carries out of layer processes;

4) slope excavation is put in rock stratum, bottom: when the upper soil horizon in excavation groove is excavated to elegance and talent rock and ash rock stratum, in groove both sides Respectively stay 1 meter of wide step, then use quartering hammer that by gradient 1:0.5, the rock stratum below step is put slope excavation;

5) excavation sand material at the bottom of groove foundation ditch changes and fills out: after rock stratum has been excavated, with sand material to change bottom foundation ditch fill out levelling extremely Duct bottom presets absolute altitude;

6) Pipe installing;

7) medium coarse sand and backfilling of earthwork.

Concrete, described excavation line uses ash white lead to spill line.

Concrete, described step 2) and step 3) in be all one section with the excavation groove of 20 meters long, excavation section by section.

Concrete, in described step 3), linked network injection mixed earth process step is as follows: at the domatic some diameters of vertical wedging 10 millimeters, the joint bar of long 40 centimetres, joint bar spacing in length and breadth is 1 meter, lays the steel wire of one layer of Φ 1*40*40 on each joint bar, Linked network gets final product gunite concrete after completing, described concrete is the pea gravel concreten of intensity C20, and mixed earth jet thickness is 100 Millimeter.

Concrete, described step 6) sequentially includes the following steps: lifting pipeline, tubing installation, absolute altitude and axial line control, pipeline External tapping linked network smear band, 180 ° assure concreting, pipeline inner joint smears band.

Concrete, described step 7) comprises the following steps: in mounted pipeline both sides, the most uniformly blanking medium coarse sand returns Filling out, every layer of backfill thickness 500 millimeters, and compacting of successively sprinkling water, the medium coarse sand dry weight of backfill is more than or equal to 16KN/m;It is backfilled to Time more than pipeline top at 500 millimeters, the earthen backfill that employing excavation groove digs out to original ground absolute altitude, in excavation groove both sides pair Claim backfill compaction in layers.

The beneficial effects of the present invention is: the present invention can cost-effective, reduction of erection time to a great extent, reduction construction Difficulty, minimizing potential safety hazard.

During deep foundation pit open cutting pipeline construction under rich water, ground complex geological condition, need foundation ditch is carried out Supporting and sealing, otherwise cannot be carried out Pipe installing operation, and Larsen steel sheet pile supporting construction steel sheet pile cannot enter rock, especially exist In the case of rock stratum, bottom section is uneven there is bigger space and cause stagnant water effect in steel sheet pile lower end and rock stratum contact position The best, water yield is big, affects operation during channel excavation, pipeline mounting construction, there is bigger potential safety hazard, and Lower trench cubic meter of stone machinery after steel encloses purlin, steel shotcrete support is installed be difficult to abolish to use and manually abolish, is running into weak point When changing rock stratum, manual operation efficiency is poor, and serious extends the construction period, adds construction cost, and difficulty of construction is bigger.

And the present invention " dark cofferdam " construction method be by the cement of the groove two bad soil layer of upper lateral part mixing in advance, Element soil mixture changes and fills out, and compaction in layers forms dark cofferdam to reach stagnant water effect, sprays side slope linked network during channel excavation Anchor, rock stratum, bottom quartering hammer abolishes, and construction technology is simple, and difficulty of construction is low, and plant equipment demand is few, shortens construction work Phase, save construction cost, safely and effectively.

Accompanying drawing explanation

Detailed description of the invention with regard to the present invention is described further below in conjunction with the accompanying drawings, wherein:

Fig. 1 is to excavate groove both sides excavation line unwrapping wire schematic diagram in the present invention;

Fig. 2 is that in excavating groove in the present invention, slope excavation schematic diagram is put in layering.

Detailed description of the invention

A kind of pipeline construction method being applicable to compound stratum open cut pipe of the present invention, Specific construction operating procedure is as follows:

(1) surveying setting-out

With reference to shown in Fig. 1, the well location of inspection shaft 2 and the degree of depth measuring of excavation groove 1 according to job site excavate groove 1 both sides Cipangopaludina chinensis layer, the excavation line 3 of 2 meters wide of liquefaction soil layers, depending on trench well width d is by requirements for pipes of constructing, excavation line 3 is with white Ashes spills line, it is to avoid owe to dig or backbreak.

(2) in the excavation line of excavation groove both sides, changing of mixture is filled out

1. Cipangopaludina chinensis layer, liquefaction soil layers excavation: excavation construction from top to down, according to excavation line first by clear for excavation line internal upper part soil layer Remove, then carry out Cipangopaludina chinensis, liquefaction soil layers is excavated, excavation width excavation live width 2m, excavate as one section using every 20m, excavated Journey forbids side or the bottom steady soil of backbreaking, strictly controls cutting depth.Scene accomplishes, with digging with fortune, to use dump truck It is transported to appointed place and concentrates stacking, in order to avoid polluting environment.

2. cement, soil mixture altering fill: immediately by mixing in advance after Cipangopaludina chinensis layer, liquidized layer soil layer are removed Cement, element soil mixture back-filling in layers compacting (cement participates in ratio for the quality of cement: the wet quality=10%-15% of element soil), with Prevent the phenomena impair stagnant water effect that caves in;Every layer is spread out and put on thickness is 500-800mm, every layer paved after use digging machine enter Row rolls, and then uses vibro-rammer compacting, and every layer is rolled and tamp pass no less than 3-5 time.

(3) upper soil horizon puts slope excavation

With reference to shown in Fig. 2, excavation section groove uses puts slope excavation, and the gradient is 1:0.5, strict control excavation limit in digging process Line, by the 20m segmentation of above-mentioned altering fill, section construction, the preceding paragraph Pipe installing carries out next section of earth excavation after completing to be executed Work, forbids to backbreak, and prevents changing the cement filled out, element soil mixture is excavated and do not had stagnant water effect.

Owing to excavation groove top 3-5m scope is bad soil layer, water yield is big, and slope stability is poor, for preventing domatic being subject to Rain drop erosion and produce and slip by slope phenomenon, immediately to the domatic m esh-hanging sprayed concrete that carries out fixed after excavation: i.e. domatic vertically Wedging diameter 10mm, the joint bar of long 40cm, joint bar spacing 1m in length and breadth, lay the steel wire 4 of one layer of Φ 1*40*40, steel thereon Silk screen 4 linked network gets final product gunite concrete after completing, and concrete strength is C20 pea gravel concreten, and thickness is 100mm.

(4) slope excavation is put in rock stratum, bottom

After slope excavation is put in the upper soil horizon earthwork, for preventing the bad soil layer in top from causing partial collapse during rock stratum is abolished Impact construction, in time being excavated to decomposed rock and ash rock stratum, the step 5 of 1m is respectively stayed on both sides, uses quartering hammer to abolish rock stratum by 1:0.5 Put slope excavation, strictly control substrate absolute altitude during excavation, forbid to backbreak.

(5) excavation sand material at the bottom of groove foundation ditch changes and fills out

When abolishing rock stratum with quartering hammer, the absolute altitude at the bottom of foundation ditch should be used after having abolished less than the absolute altitude 600mm bottom pipe laying 6 Sand material changes fills out levelling foundation ditch to pipeline 6 bottom design absolute altitude, prevents pipeline 6 in pipe installation process from sinking.

(6) Pipe installing

According to the following steps operation: lifting pipeline → tubing installation → absolute altitude, axial line control → pipeline external tapping linked network smear band → Assure concreting → pipeline inner joint for 180 ° and smear band.

(7) medium coarse sand and backfilling of earthwork

The most uniformly blanking medium coarse sand backfill in mounted pipeline both sides, every layer of backfill thickness 500 millimeters, and rammer of successively sprinkling water Real, the medium coarse sand dry weight of backfill is more than or equal to 16KN/m;When being backfilled at 500 millimeters of more than pipeline top, use excavation groove The earthen backfill dug out is to original ground absolute altitude, in excavation groove lateral symmetry backfill compaction in layers.

The above, the only preferable detailed description of the invention of the present invention, but scope is not limited thereto, and any Those familiar with the art in the technical scope of present disclosure, the change that can readily occur in or replacement, all answer Contain within protection scope of the present invention.

Claims (6)

1. the construction method being applicable to compound stratum open cut pipeline, it is characterised in that comprise the following steps:
1) surveying setting-out: according to well location and the degree of depth of excavation groove of job site inspection shaft, measuring goes out to excavate groove both sides Cipangopaludina chinensis layer, 2 meters of wide excavation lines of liquefaction soil layers;
2) in the excavation line of excavation groove both sides, changing of mixture is filled out: according to excavation line excavation construction from top to bottom, first will excavation The soil layer of line internal upper part is excavated, then the Cipangopaludina chinensis layer of bottom, liquefaction soil layers is excavated;After Cipangopaludina chinensis layer, liquefaction soil layers are excavated, To stir the cement of preparation and the mixture back-filling in layers compacting of element soil in advance, every layer of thickness spread out and put on is 500-800 millimeter, often Layer uses excavator to roll after having paved, and then uses vibro-rammer compacting, and every layer of pass rolling and tamping is more than In 3-5 time;In described mixture, the quality of cement is 10%~15% with the wet mass ratio of element soil;
3) upper soil horizon puts slope excavation: the upper soil horizon in excavation groove puts slope excavation by gradient 1:0.5, to top soil after excavation The domatic mixed earth of linked network injection that carries out of layer processes;
4) slope excavation is put in rock stratum, bottom: when the upper soil horizon in excavation groove is excavated to elegance and talent rock and ash rock stratum, in groove both sides Respectively stay 1 meter of wide step, then use quartering hammer that by gradient 1:0.5, the rock stratum below step is put slope excavation;
5) excavation sand material at the bottom of groove foundation ditch changes and fills out: after rock stratum has been excavated, with sand material to change bottom foundation ditch fill out levelling extremely Duct bottom presets absolute altitude;
6) Pipe installing;
7) medium coarse sand and backfilling of earthwork.
A kind of construction method being applicable to compound stratum open cut pipeline the most according to claim 1, it is characterised in that described Excavation line uses ash white lead to spill line.
A kind of construction method being applicable to compound stratum open cut pipeline the most according to claim 1, it is characterised in that described Step 2) and step 3) in be all one section with the excavation groove of 20 meters long, excavation section by section.
A kind of construction method being applicable to compound stratum open cut pipeline the most according to claim 1, it is characterised in that described In step 3), linked network injection mixed earth process step is as follows: the domatic some diameters of vertical wedging 10 millimeters, long 40 centimetres insert Muscle, joint bar spacing in length and breadth is 1 meter, lays the steel wire of one layer of Φ 1*40*40 on each joint bar, and linked network is the most sprayable mixed after completing Solidifying soil, described concrete is the pea gravel concreten of intensity C20, and mixed earth jet thickness is 100 millimeters.
A kind of construction method being applicable to compound stratum open cut pipeline the most according to claim 1, it is characterised in that described Step 6) sequentially includes the following steps: lifting pipeline, tubing is installed, absolute altitude and axial line control, pipeline external tapping linked network smear band, 180 ° Assure concreting, pipeline inner joint smears band.
A kind of construction method being applicable to compound stratum open cut pipeline the most according to claim 1, it is characterised in that described Step 7) comprises the following steps: the most uniformly blanking medium coarse sand backfill in mounted pipeline both sides, every layer of backfill thickness 500 milli Rice, and compacting of successively sprinkling water, the medium coarse sand dry weight of backfill is more than or equal to 16KN/m;It is backfilled at 500 millimeters of more than pipeline top Time, use the earthen backfill that excavation groove digs out to original ground absolute altitude, backfill and compaction in layers in excavation groove lateral symmetry.
CN201610695867.2A 2016-08-21 2016-08-21 Construction method applicable to open-excavation pipeline at compound stratum CN106320368A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106978843A (en) * 2017-04-25 2017-07-25 杭州之江市政建设有限公司 Municipal drainage pipeline construction technology
CN108412016A (en) * 2018-03-15 2018-08-17 中建五局土木工程有限公司 Underground tube body assures construction method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1469028A1 (en) * 1986-07-02 1989-03-30 Московский гидромелиоративный институт Trench for laying thin-walled pipeline
CN1851144A (en) * 2006-05-12 2006-10-25 江西基业科技有限公司 Column-hammer strong-tamper displacing base kit supporting construction method
CN101749485A (en) * 2008-12-18 2010-06-23 上海市机械施工有限公司 Pipeline laying construction method combining non-excavation jacking and liquid nitrogen horizontal freezing excavation laying
CN103526768A (en) * 2013-11-01 2014-01-22 科达集团股份有限公司 Construction method for partitioning strong permeable stratum
CN103527847A (en) * 2013-10-30 2014-01-22 重庆大学 Pipe burying structure capable of reducing pipe top vertical loads and construction method for pipe burying structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1469028A1 (en) * 1986-07-02 1989-03-30 Московский гидромелиоративный институт Trench for laying thin-walled pipeline
CN1851144A (en) * 2006-05-12 2006-10-25 江西基业科技有限公司 Column-hammer strong-tamper displacing base kit supporting construction method
CN101749485A (en) * 2008-12-18 2010-06-23 上海市机械施工有限公司 Pipeline laying construction method combining non-excavation jacking and liquid nitrogen horizontal freezing excavation laying
CN103527847A (en) * 2013-10-30 2014-01-22 重庆大学 Pipe burying structure capable of reducing pipe top vertical loads and construction method for pipe burying structure
CN103526768A (en) * 2013-11-01 2014-01-22 科达集团股份有限公司 Construction method for partitioning strong permeable stratum

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106978843A (en) * 2017-04-25 2017-07-25 杭州之江市政建设有限公司 Municipal drainage pipeline construction technology
CN106978843B (en) * 2017-04-25 2019-11-15 杭州之江市政建设有限公司 Municipal drainage pipeline construction technology
CN108412016A (en) * 2018-03-15 2018-08-17 中建五局土木工程有限公司 Underground tube body assures construction method

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