CN102828520A - Ring-shaped inner supporting structure used in deep peat soil deep foundation pit - Google Patents

Ring-shaped inner supporting structure used in deep peat soil deep foundation pit Download PDF

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Publication number
CN102828520A
CN102828520A CN2012103351725A CN201210335172A CN102828520A CN 102828520 A CN102828520 A CN 102828520A CN 2012103351725 A CN2012103351725 A CN 2012103351725A CN 201210335172 A CN201210335172 A CN 201210335172A CN 102828520 A CN102828520 A CN 102828520A
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pile
deep
foundation ditch
support
inner supporting
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CN2012103351725A
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Chinese (zh)
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徐杨青
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中煤科工集团武汉设计研究院中汉岩土工程分公司
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Priority to CN2012103351725A priority Critical patent/CN102828520A/en
Publication of CN102828520A publication Critical patent/CN102828520A/en

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Abstract

The invention relates to a ring-shaped inner supporting structure used in a deep peat soil deep foundation pit. The ring-shaped inner supporting structure comprises a supporting system, a waterproof curtain, a slope unloading system and a support replacement system and is characterized in that the supporting system is divided into a support pile, a top beam, a ring beam, an angle brace and a communication beam, the top of the support pile is provided with the reinforced concrete top beam; the top beam forms an external structure of the foundation pot; the ring-shaped inner supporting structure is formed in a way of combining the ring beam, the angle brace and the communication in the middle; and the overall plan for the support of the foundation pit engineering is formed by using the combined support and the pit wall waterproof curtain together with the means of large-area soil-discharge de-loading and the like. With the adoption of the ring-shaped inner supporting structure, the problems of small anchor tensile force, easily-happened creep deformation, large deformation as well as invasion and harassment to the adjacent property of an anchor rope in the common design in peat soil are solved generally, and the disadvantages that common inner supporting types such as lattices, trusses and beams seriously affect the earthworks digging and transporting as well as the construction of an underground structure are overcome; and furthermore, the engineering cost is reduced furthest, and the earthworks digging and transporting as well as foundation construction periods are shortened.

Description

A kind of annular inner supporting structure that is applied in the deep peat soil deep foundation ditch

Technical field

The present invention relates to a kind of annular inner supporting structure that is applied in the deep peat soil deep foundation ditch.

Background technology

Along with continually developing of urban underground space utilized and a large amount of construction of highrise building, the scale of deep-foundation pit engineering and the degree of depth be also in continuous increase, and the deep-foundation pit engineering problem has become the focus and the difficult point of engineering construction field.Some periphery place, regional Dian Chi foundation soils are the deep peat soil that liminetic facies, gyittja form; Have saturated, porosity, soft mould shape to stream mould shape, soil property soft, be rich in characteristics such as a large amount of organic matters and humus; Be " peat composed of rotten mosses " layer that is commonly called as, be soil layer a little less than the typical dead-soft.

At present, some regional shallow foundation holes are adopted spray anchor or pile-anchor retaining structure mostly.Since Dian Chi periphery place mainly by high-compressibility, owe fixed peat soil and form, bearing capacity of foundation soil is extremely low, the anchor pulling force wretched insufficiency that can provide; And the anchor cable in the peat soil is prone to place creep, causes pulling capacity to lose efficacy, and the soldier pile displacement is excessive, is unfavorable for the control to foundation pit deformation; The creep of anchor cable and large deformation also can destroy the water-stop curtain integrality, produce soil erosion, jeopardize the safety of foundation ditch itself and peripheral path, existing before a large amount of failure case.On the other hand, if adopt the pile-anchor retaining structure, to two-layer and two-layer above ultra-deep foundation pit 2~3 layers of anchor pole (rope) need be set then, every layer of anchor pole all needs the certain construction period and the length of time, and total construction period is longer; Moreover, the setting of arranging anchor pole (rope) more, engineering quantity is bigger, and cost is higher.At last; Deep-foundation pit engineering in the city generally all is in the intensive architectural complex; The construction plant is narrow, and the basis next-door neighbour's existing building of some engineering or the basis of structure are perhaps for planning to build the place; Being provided with of anchor pole (rope) brings very big influence to pile foundation construction in this place, and also there is certain influence in its workmanship.If adopt conventional lattice, truss, support supporting and protection structure in shoring etc., because span is big, support intensively, also can dig fortune and foundation construction and cause very big difficult and influence to pit earthwork.

Summary of the invention

Problem to above-mentioned several respects; The object of the present invention is to provide a kind of being applied in the deep peat soil stratum, control foundation pit deformation in order to solve to adopt traditional supporting method to be difficult to, be prone to produce the side slope unstability and invade in the annular of a difficult problem such as adjacent property rights and support supporting and protection structure.

For realizing above-mentioned purpose; The technical scheme that the present invention adopted is: a kind of annular inner supporting structure that is applied in the deep peat soil deep foundation ditch is characterized in that: add with the bored pile campshed and be supported for main supporting and protection structure in the annular, in conjunction with means such as hole wall water-stop curtains; Support and adopt supporting form in the steel concrete annular; Inner supporting structure intensity is high, rigidity is big, the stressed symmetry of support system, and stress characteristic is clear and definite; Because the arching of circular supporting and protection structure has than the general better stress performance of polygon supporting and protection structure.Be designed to cirque structure to stressed supporting form, more can make full use of the high characteristics of concrete anti-pressure ability, soil body lateral pressure is passed to through dado structure and is enclosed purlin and web member, concentrates and passes to annulus.Because soil pressure is with the linear distributed load that increases of the degree of depth and does not have concentrated force, utilizes circular supporting and protection structure to come a retaining soil pressure can make full use of material property.Because circle supporting and protection structure is to be main with pressurized, and act on the circular arch around the soil pressure major part can self balance.This rational supporting and protection structure can reduce the expense of supporting and protection structure greatly; And can aspect stability and controlled deformation, satisfy requirement to surrounding environment control, make things convenient for the rapid construction and the MAT'L recycling of soil excavation and agent structure simultaneously to greatest extent.Arrange through major diameter annular girder (concrete size can be adjusted according to the deep foundation ditch size of excavation) support system; Reduce the distance between annular girder and the peripheral soldier pile crown beam simultaneously as far as possible; Significantly reduced the quantity of supporting rod; Reduce the earthwork and draw the engineering quantity of digging, convenient follow-up foundation construction reduces the construction period.

The invention has the beneficial effects as follows: 1. reduced the deep-foundation pit engineering cost, reduced the construction period, the safety that has guaranteed foundation ditch and surrounding enviroment is with stable.The distortion of annular inner supporting structure is little, safety factor is high; Greatly reduce the risk of ultra-deep foundation pit supporting; The reduction of this risk can not only be practiced thrift the various expenses of speedily carrying out rescue work; Under certain condition, can improve simultaneously the duration, ensure the safety of constructor and surrounding enviroment, support in especially can invade and close on the place, can bring some risk (not clear because of underground obstacle often like anchor pole, as to punch cable etc.) because of underground construction unlike anchor pole; Bring some unpredictalbe economic losses and social destabilizing factor, its society and economic benefit are conspicuous.

2. the history that Dian Chi periphery peat soil layer place can not excavate ultra-deep foundation pit, build two-layer above basement is through with.The Dian Chi periphery is because of the peat soil bed thickness, and foundation pit deformation is big, and security incident often takes place, so each Construction Party adopts the mode in shallow foundation hole to avoid the excavation of deep foundation ditch (foundation trench) mostly, and even so, foundation ditch peace accident still happens occasionally.Supporting scheme of the present invention has solved the ultra-deep foundation pit supporting difficult problem of two-layer and two-layer above basement in peat soil well, and the Dian Chi periphery that is through with does not have the history of ultra-deep foundation pit, and social influence power is huge.

Description of drawings

Fig. 1 is the supporting and protection structure layout plan;

Among the figure, 1-Guan Liang; The 2-soldier pile; The 3-angle brace; 4-gets in touch beam; The 5-ring beam.

Fig. 2 is the supporting and protection structure sectional drawing;

Among the figure, the 1-gutter; The 2-soil nailing; The 3-sprayed mortar; 4-Guan Liang; The double stirring diaphragm wall of 5-; The 6-bored pile; The 7-supporting rod; 8-changes the support steel pipe; Sprayed mortar between the 9-stake; 10-changes the support concrete; The 11-stand column pile; The 12-basement structure.

Fig. 3 is soldier pile and water-stop curtain layout plan.

Among the figure, the 1-soldier pile; The double stirring diaphragm wall of 2-.

The specific embodiment

Below in conjunction with description of drawings and embodiment the present invention is further specified.

In Fig. 1, Fig. 2, first embodiment shown in Figure 3; A kind of annular inner supporting structure that is applied in the deep peat soil deep foundation ditch; Comprise support system, water-stop curtain, put sloping uninstalling system and change support system, it is characterized in that: described support system is divided into soldier pile, Guan Liang, ring beam, angle brace and contact beam, and the soldier pile top is provided with steel concrete Guan Liang; Guan Liang forms the foundation ditch contour structures, and the middle form that adopts ring beam, angle brace and contact beam to combine forms annular inner supporting structure; The arching of annular inner supporting structure has than the general better stress performance of polygon supporting and protection structure, utilizes the high characteristics of concrete anti-pressure ability, and soil body lateral pressure is passed to through dado structure and enclosed purlin and web member, concentrates and passes to ring beam; Its intensity is high on the whole, rigidity is big, the stressed symmetry of support system, and stress characteristic is clear and definite; Can effectively improve the stressed of inner supporting body system through above structure setting, and reduce supporting rod quantity, and make things convenient for the fortune of digging of the earthwork.

Described soldier pile adopts bored pile technology, in the work progress of soldier pile, and absolute altitude at the bottom of strict control stake position, the stake pile jacking, sediment Baidu, mud balance, concrete quality under water.

In order to reduce the slenderness ratio of support, the off-centre that causes for the deadweight of bearing support and construction error simultaneously and the moment of flexure that produces are laid stand column pile supporting the middle part; The column hypomere adopts bored pile; Stand column pile end face absolute altitude is a basis end absolute altitude, and top adopts four equal leg angles to be welded into support, and angle steel inserts castinplace pile.

Because soil pressure is with the linear distributed load that increases of the degree of depth and does not have concentrated force, utilizes circular supporting and protection structure to come a retaining soil pressure can make full use of material property.Because circle supporting and protection structure is to be main with pressurized, and act on the circular arch around the soil pressure major part can self balance.This rational supporting and protection structure can reduce the expense of supporting and protection structure greatly; And can aspect stability and controlled deformation, satisfy requirement to surrounding environment control, make things convenient for the rapid construction and the MAT'L recycling of soil excavation and agent structure simultaneously to greatest extent.

In Fig. 1, Fig. 2, second embodiment shown in Figure 3; Described water-stop curtain adopts agitation pile diaphragm wall technology; Along the engaged deep-mixed pile of soldier pile arranged outside two rows, adopt special additive and multiple spray to stir technology again, guarantee in the peat soil layer, to stir deeply the quality of stake.

Describedly put sloping uninstalling system and be located in the 2.6-2.8m scope of foundation ditch top, to reduce the active region soil pressure, be provided with in the slope and put sloping platform, net spray plane, spray anchor net, compound shotcrete rock bolt wire mesh support are hung in domatic employing.

Described to change support design be after the basement bottom board construction is accomplished, and the base plate periphery is adopted the backfill of C15 concrete, backfill thickness 50cm~80cm, construct underground two layers of exterior wall and top board again.In underground two layers of top board position concrete is set and changes the support steel pipe, with soldier pile and outer wall of basement to support.Treat withdrawing from supporting rod after the support completion.

In Fig. 1, Fig. 2, the 3rd embodiment shown in Figure 3, in order to reduce the slenderness ratio of support, the off-centre that causes for the deadweight of bearing support and construction error simultaneously and the moment of flexure that produces are laid stand column pile supporting the middle part.The column hypomere adopts bored pile, and stand column pile end face absolute altitude is a basis end absolute altitude, and top adopts four equal leg angles to be welded into support, and angle steel inserts castinplace pile.

In Fig. 1, Fig. 2, the 4th embodiment shown in Figure 3, sloping debarkation station is put on foundation ditch top and inter-pile soil all adopts soil nailing to hang the supporting of net spray plane.Spray plane adopt to spray concrete, and for example, the concrete design strength is C20, and thickness is 8cm, and proportioning is a cement: sand: stone=1: 2: 1.5, water/binder ratio are 0.4~0.5, adopts Pas32.5 cement, particle diameter to be not more than middle fine sand and the particle diameter of the 2.5mm Guamishi less than 5mm; The steel mesh reinforcement specification is Φ 6.5200 * 200, and reinforcing rib is Φ 16 round steel.Each row's anchor pole, reinforcing rib are welded into network, to increase surface layer rigidity.

In Fig. 1, Fig. 2, the 5th embodiment shown in Figure 3, the step of concrete operations: 1, soil excavation, soil excavation adopts backhoe excavation, tipping truck muck haulage.To supporting following cubic metre of earth, adopt little digging machine to draw and dig, transport, the method for big digging machine entrucking in annulus is carried out soil excavation.Excavation is preceding by surveyor's measuring excavation of foundation pit line and careful confirmation.

Stage excavation during the excavation pit edge earthwork, every layer of about 2m of cutting depth.The slope is repaiied in domatic employing manual work, forbids machinery to the established domatic impact wreckage of carrying out.During excavation of foundation pit, must accomplish to excavate one deck, supporting one deck excavates one section, and one section of supporting is forbidden to backbreak.Behind the excavation, the domatic immediate support of wanting must not expose long.Same domatic on, upper strata prop engineering time and subsoil digging time must not be less than 48 hours at interval.

2,1. soldier pile of slope retaining: soldier pile adopts drill-pouring technology, and the stake footpath is 1000mm, and pile spacing is 1200mm, and concrete piles all adopts C30.

Soldier pile can be divided into two types according to the arrangement of reinforcement difference:

A, stake footpath 1m, the long 24.30m of stake, 25.3m, stake top mark height-4.1m, main muscle 18 Φ 25, the elongated configuration of soldier pile master muscle;

B, stake footpath 1m, the long 27.5m of stake, stake top mark height-4.1m, main muscle 24 Φ 25, the elongated configuration of soldier pile master muscle;

In the work progress of soldier pile, absolute altitude at the bottom of strict control stake position, the stake pile jacking, sediment Baidu, mud balance, concrete quality under water.

2. water-stop curtain construction: water-stop curtain adopts double stirring diaphragm wall technology.The stake footpath is 500mm, and pile spacing is 300mm, along soldier pile arranged outside two row's agitation piles.Speed is stirred in the strict control stake of water-stop curtain construction position, a stake stake end absolute altitude, pile spacing, cement consumption, multiple spray again.

3. Guan Liang construction: carry out the construction of Guan Liang during to-4.1m at soil excavation.The soldier pile top is provided with steel concrete Guan Liang, and the hat depth of beam is 800mm, and width is 1400mm, and main muscle is 2*12 Φ 22+2*3 Φ 18.Stirrup is 2* Φ 8@200, and it is 100 that the node place adds, and concrete strength is C30, and it is 10mm that soldier pile embeds the hat beam length.The strict control of Guan Liang construction midline position, hat back absolute altitude.

4. support construction: at soil excavation during to-4.1m and the construction supported simultaneously of Guan Liang.Support system is divided into ring beam, angle brace and contact beam, and its sectional dimension is wide * and height is respectively 1300 * 800,700 * 750,600 * 600.When supporting construction, strict control plane position, bottom absolute altitude, cushion thickness and protective layer thickness, reduce constuction joint quantity as far as possible.

5. domatic construction: sloping debarkation station is put on foundation ditch top and inter-pile soil all adopts soil nailing to hang the supporting of net spray plane.Spray plane adopt to spray concrete, and the concrete design strength is C20, thickness 6cm-8cm, and proportioning is a cement: sand: stone=1: 2: 1.5, water/binder ratio are 0.4~0.5, adopt Pas32.5 cement, particle diameter to be not more than middle fine sand and the particle diameter of the 2.5mm Guamishi less than 5mm.The steel mesh reinforcement specification is Φ 6.5200 * 200, and reinforcing rib is Φ 16 round steel.Each row's anchor pole, reinforcing rib are welded into network, to increase surface layer rigidity.Last hypomere steel mesh reinforcement lap length should be greater than 300mm.In the domatic work progress, the jet thickness of domatic smooth, the anchor pole degree of depth of strict control, steel mesh reinforcement lap length, concrete etc.

3, foundation ditch sealing draining, foundation ditch mainly adopt bright row's in deep-mixed pile sealing, the hole mode to carry out.Around foundation ditch, build gutter (or setting up the PVC gutter), collecting well and sedimentation basin by laying bricks or stones, form drain line.Along excavating easy gutter and collecting well all around, adopt foul water pump in the foundation ditch, enter urban sewerage and drainage system through three grades of sedimentation basins with in the gutter around the ponding pump drainage in the foundation ditch is to foundation ditch.

Claims (5)

1. annular inner supporting structure that is applied in the deep peat soil deep foundation ditch; Comprise support system, water-stop curtain, put sloping uninstalling system and change support system; It is characterized in that: described support system is divided into soldier pile, Guan Liang, ring beam, angle brace and contact beam; The soldier pile top is provided with steel concrete Guan Liang, and Guan Liang forms the foundation ditch contour structures, and the middle form that adopts ring beam, angle brace and contact beam to combine forms annular inner supporting structure; The arching of annular inner supporting structure has than the general better stress performance of polygon supporting and protection structure, utilizes the high characteristics of concrete anti-pressure ability, and soil body lateral pressure is passed to through dado structure and enclosed purlin and web member, concentrates and passes to ring beam; Its intensity is high on the whole, rigidity is big, the stressed symmetry of support system, and stress characteristic is clear and definite; Can effectively improve the stressed of inner supporting body system through above structure setting, and reduce supporting rod quantity, and make things convenient for the fortune of digging of the earthwork;
Described soldier pile adopts bored pile technology, in the work progress of soldier pile, and absolute altitude at the bottom of strict control stake position, the stake pile jacking, sediment Baidu, mud balance, concrete quality under water;
In order to reduce the slenderness ratio of support, the off-centre that causes for the deadweight of bearing support and construction error simultaneously and the moment of flexure that produces are laid stand column pile supporting the middle part; The column hypomere adopts bored pile; Stand column pile end face absolute altitude is a basis end absolute altitude, and top adopts four equal leg angles to be welded into support, and angle steel inserts castinplace pile;
Described water-stop curtain adopts double stirring diaphragm wall technology, along the engaged deep-mixed pile of soldier pile arranged outside two rows, adopts special additive and multiple spray to stir technology again, guarantees in the peat soil layer, to stir deeply the quality of stake.
2. a kind of annular inner supporting structure that is applied in the deep peat soil deep foundation ditch according to claim 1; It is characterized in that: describedly put sloping uninstalling system and be located in the 2.6-2.8m scope of foundation ditch top; To reduce the active region soil pressure; Be provided with in the slope and put sloping platform, net spray plane, spray anchor net, compound shotcrete rock bolt wire mesh support are hung in domatic employing.
3. a kind of annular inner supporting structure that is applied in the deep peat soil deep foundation ditch according to claim 1; It is characterized in that: the described support system that changes is after the basement bottom board construction is accomplished; The base plate periphery is adopted concrete backfill; Backfill thickness 50cm~80cm, construct again underground two layers of exterior wall and top board; In underground two layers of top board position concrete is set and changes the support steel pipe, with soldier pile and outer wall of basement to support; Treat withdrawing from supporting rod after the support completion.
4. a kind of annular inner supporting structure that is applied in the deep peat soil deep foundation ditch according to claim 1 and 2 is characterized in that: sloping debarkation station is put on foundation ditch top and inter-pile soil all adopts soil nailing to hang the supporting of net spray plane; Spray plane adopts and sprays concrete; Each row's anchor pole, reinforcing rib are welded into network, to increase surface layer rigidity.
5. a kind of annular inner supporting structure that is applied in the deep peat soil deep foundation ditch according to claim 1, it is characterized in that: the present invention also is provided with foundation ditch sealing drainage system, and foundation ditch mainly adopts bright row's in deep-mixed pile sealing, the hole mode to carry out; Around foundation ditch, build gutter (or setting up the PVC gutter), collecting well and sedimentation basin by laying bricks or stones, form drain line; Along excavating easy gutter and collecting well all around, adopt foul water pump in the foundation ditch, enter urban sewerage and drainage system through three grades of sedimentation basins with in the gutter around the ponding pump drainage in the foundation ditch is to foundation ditch.
CN2012103351725A 2012-09-11 2012-09-11 Ring-shaped inner supporting structure used in deep peat soil deep foundation pit CN102828520A (en)

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CN103015434A (en) * 2012-12-31 2013-04-03 上海强劲地基工程股份有限公司 High-stiffness monolithic prestress assembly type foundation pit bracing inner-supporting system
CN103967018A (en) * 2014-05-09 2014-08-06 深圳市工勘岩土集团有限公司 Deep and large foundation pit angle supporting horizontal shearing resistance structure
CN104563127A (en) * 2014-12-01 2015-04-29 南京工业大学 Novel deep foundation pit supporting structure and construction method for same
CN104695447A (en) * 2015-03-13 2015-06-10 朱奎 Deep basement support
CN104727324A (en) * 2015-03-20 2015-06-24 朱奎 Support construction method of irregular basement
CN104831738A (en) * 2015-05-25 2015-08-12 成都市第六建筑工程公司 Internal support replacement construction method for concrete beam of anchoring dado pile
CN105019553A (en) * 2015-05-22 2015-11-04 朱奎 Bracing structure for annular supports of basement
CN105239582A (en) * 2015-09-07 2016-01-13 中铁三局集团有限公司 Construction method applicable to constructing special-shaped big deep crossing joint foundation pit annular support
CN105951848A (en) * 2016-07-01 2016-09-21 杭州江润科技有限公司 Non-intermittent composite transfer structure for super-deep foundation pit support and construction method
CN106522235A (en) * 2016-11-01 2017-03-22 中化二建集团有限公司 Narrow site deep foundation pit excavation supporting construction method
CN107227741A (en) * 2017-07-30 2017-10-03 叶长青 Basement supporting construction
CN108547367A (en) * 2018-05-11 2018-09-18 深圳市中邦(集团)建设总承包有限公司 A kind of sedimentation basin and its construction method closing on seashore
CN108842785A (en) * 2018-07-05 2018-11-20 重庆水利电力职业技术学院 A kind of method of architectural engineering pit supporting

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103015434A (en) * 2012-12-31 2013-04-03 上海强劲地基工程股份有限公司 High-stiffness monolithic prestress assembly type foundation pit bracing inner-supporting system
CN103967018A (en) * 2014-05-09 2014-08-06 深圳市工勘岩土集团有限公司 Deep and large foundation pit angle supporting horizontal shearing resistance structure
CN103967018B (en) * 2014-05-09 2016-10-05 深圳市工勘岩土集团有限公司 Deep big foundation pit angle support level shear structure
CN104563127A (en) * 2014-12-01 2015-04-29 南京工业大学 Novel deep foundation pit supporting structure and construction method for same
CN104695447A (en) * 2015-03-13 2015-06-10 朱奎 Deep basement support
CN104695447B (en) * 2015-03-13 2017-01-25 朱奎 deep basement support
CN104727324A (en) * 2015-03-20 2015-06-24 朱奎 Support construction method of irregular basement
CN104727324B (en) * 2015-03-20 2016-08-03 朱奎 Irregular basement construction method for supporting
CN106958247A (en) * 2015-05-22 2017-07-18 朱奎 Basement annular brace support system
CN105019553A (en) * 2015-05-22 2015-11-04 朱奎 Bracing structure for annular supports of basement
CN105019553B (en) * 2015-05-22 2017-07-28 朱奎 Basement annular brace supporting construction
CN104831738A (en) * 2015-05-25 2015-08-12 成都市第六建筑工程公司 Internal support replacement construction method for concrete beam of anchoring dado pile
CN105239582A (en) * 2015-09-07 2016-01-13 中铁三局集团有限公司 Construction method applicable to constructing special-shaped big deep crossing joint foundation pit annular support
CN105951848A (en) * 2016-07-01 2016-09-21 杭州江润科技有限公司 Non-intermittent composite transfer structure for super-deep foundation pit support and construction method
CN105951848B (en) * 2016-07-01 2018-06-19 浙江新曙光建设有限公司 Ultra-deep foundation pit supports Non-intermittent combined type transformational structure and construction method
CN106522235A (en) * 2016-11-01 2017-03-22 中化二建集团有限公司 Narrow site deep foundation pit excavation supporting construction method
CN107227741A (en) * 2017-07-30 2017-10-03 叶长青 Basement supporting construction
CN108547367A (en) * 2018-05-11 2018-09-18 深圳市中邦(集团)建设总承包有限公司 A kind of sedimentation basin and its construction method closing on seashore
CN108842785A (en) * 2018-07-05 2018-11-20 重庆水利电力职业技术学院 A kind of method of architectural engineering pit supporting

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Application publication date: 20121219