CN105887889A - Excavation construction method for super-wide low-permeability silty deep foundation pit - Google Patents

Excavation construction method for super-wide low-permeability silty deep foundation pit Download PDF

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Publication number
CN105887889A
CN105887889A CN201610247429.XA CN201610247429A CN105887889A CN 105887889 A CN105887889 A CN 105887889A CN 201610247429 A CN201610247429 A CN 201610247429A CN 105887889 A CN105887889 A CN 105887889A
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excavation
foundation pit
construction
earth
foundation ditch
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CN201610247429.XA
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CN105887889B (en
Inventor
徐明发
刘习生
曲建华
张红乾
梁贤伟
吕东强
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Shanghai Civil Engineering Co Ltd of CREC
Huahai Engineering Co Ltd of Shanghai Civil Engineering Co Ltd of CREC
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Shanghai Civil Engineering Co Ltd of CREC
Huahai Engineering Co Ltd of Shanghai Civil Engineering Co Ltd of CREC
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits

Abstract

The invention relates to the technical field of foundation pit construction, in particular to an excavation construction method for a super-wide low-permeability silty deep foundation pit. The construction method comprises the following steps that the foundation pit is excavated in a low-permeability silty soil layer where foundation pit dewatering is not carried out, the action of earth berm under the super-wide characteristic of the foundation pit is fully used, excavation is conducted in a partitioned and layered mode, the earth berm is reserved by slotting a slot in the middle of the foundation pit, steel supports are erected, and the earth berm is excavated out, so that balance and stability of the earth berm and supporting structures in the foundation pit are ensured; and meanwhile, abnormal conditions of the foundation pit is closely concerned through foundation pit monitoring measurement, and the purposes of reducing interference of the supports to earth excavation equipment and accelerating construction progress are achieved. The stepped continuous excavation supporting construction is adopted, and excavation is conducted in a partitioned and segmented mode, so that layered, segmented, ordered and normalized foundation pit excavation is achieved, machine input is reduced, the number of times of earth relaying transferring is reduced, the machine using efficiency is improved, and repeated dispatching of machines in the excavation process is reduced.

Description

A kind of ultra-wide hyposmosis mud method of excavation of deep foundation pit
[technical field]
The present invention relates to foundation pit construction technical field, specifically a kind of ultra-wide hyposmosis mud method of excavation of deep foundation pit.
[background technology]
It is known that, domestic coastal large-and-medium size cities at present, population and construction are substantially saturated in original planning city, city, city scope is all being amplified to periphery, city is upcountry and sea is extended along the line, the construction of Climacteric symptoms area increases, China mostly is road and combines with bridges and culverts mode the traditional planning highway construction of reclaiming coastal land beach location, also it is no lack of in urban construction to plan city look and feel, build large sunk formula passage in beach area and dredge urban road, but, when constructing in the location of the features as poor geologic conditions such as beach, it is required for carrying out in advance base pit dewatering according to traditional construction method, to reduce the construction in the case of being dried of level of ground water foundation ditch.But most undergrounds, beach area soil property bad hydraulic permeability, is extremely difficult to Expected Results, also leverages construction speed, there is also well-points dewatering simultaneously and cause the harm such as land subsidence.If the excavation of foundation pit degree of depth is bigger, inner support is set inside foundation ditch, excavation of foundation pit follows the principle of " first support and dig afterwards ", certainly will exist, interfering with each other between inner support and excavation mechinery, during construction, environmental factors is relatively big to influence of foundation excavation simultaneously, and once excavation will complete structure at short notice, reduces foundation ditch and exposes the time.
[summary of the invention]
The purpose of the present invention excavates after being contemplated to solve in existing method first precipitation, support interfere with each other between excavation mechinery, the shortcoming such as excavation of foundation pit open-assembly time length, it is not provided with base pit dewatering when hyposmosis silt soil strata, save the cycle in precipitation before excavation of foundation pit, after carrying out first slot type inside excavation of foundation pit, both sides layer and section puts slope excavation, reduce inner support and set up the interference with plant equipment, improve a kind of ultra-wide hyposmosis mud method of excavation of deep foundation pit of the construction efficiency excavated at soft layer.
To achieve these goals, a kind of ultra-wide hyposmosis mud method of excavation of deep foundation pit of design, described construction method is as follows: excavate at the hyposmosis silt soil strata not carrying out base pit dewatering, take full advantage of the effect of back-pressure soil under this characteristic of foundation ditch ultra-wide, excavated by tile and hierarchy, back-pressure soil is stayed in foundation ditch middle cut, set up bracing members again, then back-pressure soil is excavated out, ensure back-pressure soil and the balance and stability of supporting construction in foundation ditch, pay close attention to foundation ditch abnormal conditions by foundation ditch monitoring measurement simultaneously, reduce support shoveling equipment is disturbed, improve construction speed.
Described construction method uses step to excavate Construction of Supporting continuously, it is that piecemeal paragraphs excavation that step excavates Construction of Supporting continuously, define the excavation of foundation pit of the segmental that has levels, according to piecemeal excavation first desurfacing slot type native, middle excavation, both sides earth excavation, form orderly normalized hydraulic character, decrease machinery input, reduce the number of times that cubic metre of earth relay is had bad luck, improve machinery service efficiency, decrease machinery and allocate and transport back and forth in digging process.
Described construction method is specific as follows: advance reservation building enclosure back-pressure soil layer during the earth excavation of foundation ditch both sides, take full advantage of the effect utilizing back-pressure soil under this characteristic of foundation ditch ultra-wide, have employed and stay back-pressure soil to keep supporting construction stable, first slotting excavation stays back-pressure soil, excavate the earthwork of interference under bracing members, then set up bracing members, then excavation back-pressure soil, avoid in Deep Excavation and interfering with each other between bracing members erection, improve construction speed and excavation efficiency.
Step excavate continuously Construction of Supporting according to layering, step by step, symmetrical, balance, five main points in limited time, follow vertical layered, longitudinal divisions, with digging with support, the principle of quick back cover, every layer of each step excavation is excavated by the order extended to both sides after middle grooving, steel pipe support is erected in time by design, and to steel pipe support pre-add axial prestress, the deformation of fender post body before minimizing supporting.
Co-occurrence excavation method of the present invention is compared, and has an advantage in that:
1, applied widely, require to reduce to soil property, hyposmosis silt soil strata also can carry out excavation of foundation pit in the case of not precipitation, cost-effective;
2, step is used to excavate Construction of Supporting continuously, piecemeal paragraphs excavation, define the excavation of foundation pit of the segmental that has levels, according to piecemeal excavation first desurfacing slot type native, middle excavation, both sides earth excavation, form orderly normalized hydraulic character, decrease machinery input, reduce the number of times that cubic metre of earth relay is had bad luck, improve machinery service efficiency, decrease machinery and allocate and transport back and forth in digging process;
3, reasonable tile and hierarchy excavation, it is ensured that set up with bracing members in Excavation Process and interfere with each other, improve construction speed and reduce security risk;
4, advance reservation building enclosure back-pressure soil layer during the earth excavation of foundation ditch both sides, take full advantage of the effect utilizing back-pressure soil under this characteristic of foundation ditch ultra-wide, have employed and stay back-pressure soil to keep supporting construction stable, first slotting excavation stays back-pressure soil, excavate the earthwork of interference under bracing members, then set up bracing members, then excavation back-pressure soil, avoid in Deep Excavation and interfering with each other between bracing members erection, improve construction speed and excavation efficiency.
[accompanying drawing explanation]
Fig. 1 is Support of Foundation Pit Excavation sectional drawing of the present invention;
Fig. 2 (a) is the foundation ditch table soil excavation plane graph of the present invention;
Fig. 2 (b) is the foundation ditch table soil excavated section figure of the present invention;
Fig. 2 (c) is that the foundation ditch table soil of the present invention has excavated sectional drawing;
Fig. 3 (a) is the lattice column way station stepwise slot type excavation plane graph of the present invention;
Fig. 3 (b) is the lattice column way station stepwise slot type excavated section figure of the present invention;
Fig. 3 (c) is that the foundation ditch lattice column way station stepwise slot type of the present invention has excavated sectional drawing;
Fig. 3 (d) is the excavation of foundation pit layering benching tunnelling method sectional drawing of the present invention;
Fig. 4 (a) is the foundation ditch both sides earth excavation plane graph of the present invention;
Fig. 4 (b) is the foundation ditch both sides earth excavation sectional drawing of the present invention;
Fig. 4 (c) is that the foundation ditch both sides earth excavation of the present invention completes sectional drawing;
Fig. 4 (d) is the excavation of foundation pit bracing members decorating position relation sectional drawing of the present invention;
Fig. 5 is that the excavation of foundation pit of the present invention completes second support erection sectional drawing;
In figure: 1. ditch 2. is preced with beam 3. first and is supported 14. excavation of foundation pit soil 15. sump 16. dump truck 17. piecemeal line 18.SMW engineering method stakes at the bottom of 4. lattice column 5. seconds support 6.H shaped steel 7. soil stabilization 8. interim sidewalk 13. foundation ditches of cast-in-situ bored pile 9. retaining wall 10. temporary road 11. excavator 12.;
Specifying Fig. 4 c is the Figure of abstract of the present invention.
[detailed description of the invention]
The invention will be further described below in conjunction with the accompanying drawings, and the structure of this device and principle are the most clearly for the people of this specialty.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
nullThe ultra-wide hyposmosis silt soil strata i.e. step of deep pit digging method excavates Construction of Supporting method continuously,It is to excavate at the hyposmosis silt soil strata not carrying out base pit dewatering,Take full advantage of the effect of back-pressure soil under this characteristic of foundation ditch ultra-wide,Use the construction of tile and hierarchy benching tunnelling method,Rationally layout excavation order,According to layering、Step by step、Symmetrical、Balance、Five main points in limited time,Follow vertical layered、Longitudinal divisions、With digging with support、The quickly principle of back cover,Every layer of excavation thickness is no more than 3m,And handle excavation and the relation supported well,The most first stay back-pressure soil in foundation ditch middle cut,Set up bracing members again,Then back-pressure soil is excavated out,Ensure back-pressure soil and the balance and stability of supporting construction in foundation ditch,Pay close attention to foundation ditch abnormal conditions by foundation ditch monitoring measurement simultaneously,Reduce support the interference of shoveling equipment is greatly improved construction speed and meets construction period.Engineering method stake can be excavated after reaching design strength, and excavation uses backacter directly to excavate, and deep layer earth excavation uses the method for step backhoe relay that the earthwork goes to ground dump truck entrucking outward transport.Every layer of each step excavation is excavated by the order extended to both sides after middle grooving, in time by design erection steel pipe support, and to steel pipe support pre-add axial prestress, and the deformation of fender post body before minimizing supporting.
Below in conjunction with drawings and the specific embodiments, the construction technical schemes in the present invention is further described.
Embodiment 1
See Fig. 1, before excavation of foundation pit, complete the foundation ditch strengthening such as temporary road, ditch, Guan Liang, soil stabilization, cast-in-situ bored pile and lattice column, SMW engineering method stake and support erection completes.
Seeing Fig. 2 (a), (b), (c), surface pond should be pumped out outside foundation ditch scope before removing by topsoil in time, and tissue mechanical equipment and circulation material are shown up, and choose suitable spoil ground simultaneously.The preferable soil utilizing the whole every day use in place builds temporary road, temporary road is built in foundation ditch both sides, ensure that earthwork transportation car can normally travel, it is equipped with enough steel plates simultaneously, 2 excavators are used to excavate during cleaning table soil, every digging machine is equipped with 3 blocks of 6000 × 3000 × 20mm steel plates and coordinates digging machine to carry out erect-position, two digging machine each responsible half range excavation of foundation pit faces respectively, fall back excavation in foundation ditch both sides, digging machine was equipped with and carried out down soil no less than 2 dump trucks every day, excavating the earthwork and be fed directly to a cubic metre of earth car pull-out foundation ditch, transport is to spoil ground.Clear table excavation THICKNESS CONTROL is in the position of high 2.5m, when lattice column earth excavation 1m (0.5m under first bracing members), should shift to an earlier date and little bracket (continuous beam bracket) is installed on lattice column, after preventing foundation ditch from digging deeply, little bracket welding difficulty, exposes soft layer, should reserve gutter and catch pit after having excavated, then carry out dry in the sun, be ready for lower step excavation.
See Fig. 3 (a), (b), (c), (d), lattice column way station stepwise slot type excavates, plant equipment and turnover steel plate are turned to foundation ditch two lattice column middle part, now owing to being excavated to soft layer, in foundation ditch, undisturbed soil can not meet transport vehicle traveling, subgrade steel plate need to be used to lay temporary road, must arrive meet transport vehicle pass through, every work surface arranges 12 blocks of 6000 × 3000 × 20mm steel plates, can lay the temporary road meeting transportation lengths.Between two lattice columns, slot type excavation uses longitudinal layered symmetrical excavation, each work surface is equipped with 2 excavators, now the excavation of foundation pit degree of depth is 5.7m, and a point two-layer is excavated, and every layer of excavation controls at about 2.85m, 2 excavator relays are had bad luck once, dump truck configures 2, remains adjustable other work surfaces that goes to of dump truck, and every day, digging machine should configure no less than 3 blocks of erect-position steel plates simultaneously, ensureing digging machine stable operation on Soft Soil Layer during excavation, earthwork transportation car form is within digging machine actionradius.Excavation is put slope and should be not less than 1:2, and every layer of cutting depth is 2.85m, and excavator maximum exhibition arm distance is 6.48~7.18m, and excavator maximum digging radius is 11.1m, and usage mining machine meets excavation demand.Way station stepwise slot type excavation is disposably directly excavated to bottom foundation ditch, reserves back-pressure soil simultaneously in foundation ditch both sides, has ensured integral stability of foundation pit, now should carry out continuous beam installation, then plant equipment be turned and walk excavation of foundation pit to foundation ditch both sides, preparation.
nullSee Fig. 4 (a)、(b)、(c)、(d),Excavation soil at both sides sets up first bracing members to second support simultaneously,After slot type has excavated,Carry out soil at both sides excavation,Both sides digging time should carry out synchronizing symmetrical excavation,Each work surface is equipped with two excavators,The longitudinal layered symmetrical excavation of same employing,Every layer of excavation thickness is at about 2.85m,When being excavated to foundation ditch-4.5m,Installation bracket in SMW engineering method stake should be shifted to an earlier date,Indispensable steel encloses purlin and installs and bracing members erection use,It is excavated to during second layer step set up first bracing members (absolute altitude is at-5.35m),Calculated by integral stability of foundation pit and learn,The operating range limit of first bracing members is 5m (it is 3.5m that actual bracing members sets up spacing),And it is excavated at the bottom of foundation ditch after setting up one bracing members,Also the requirement of base pit stability is met.After excavation second layer step, setting up first bracing members, it is-1m position that first bracing members sets up absolute altitude, second layer step-shaped top is-5.35m, first bracing members and second step headroom are 5.35-1=4.35m, and it is 3.2m that excavator runs height, meet excavator and use space.
See Fig. 5, after having excavated at the bottom of foundation ditch, set up second immediately and support, prepare blotter simultaneously and lay, reduce open-assembly time at the bottom of foundation ditch.

Claims (4)

1. a ultra-wide hyposmosis mud method of excavation of deep foundation pit, it is characterised in that described construction method is such as Under: excavate at the hyposmosis silt soil strata not carrying out base pit dewatering, take full advantage of foundation ditch ultra-wide Under this characteristic, the effect of back-pressure soil, is excavated by tile and hierarchy, stays back-pressure soil in foundation ditch middle cut, Set up bracing members again, then excavate out back-pressure soil, it is ensured that in foundation ditch, back-pressure soil is steady with the balance of supporting construction Fixed, pay close attention to foundation ditch abnormal conditions by foundation ditch monitoring measurement simultaneously, reduce support and shoveling is set Standby interference, improves construction speed.
2. a kind of ultra-wide hyposmosis mud method of excavation of deep foundation pit as claimed in claim 1, it is characterised in that Described construction method uses step to excavate Construction of Supporting continuously, and step is excavated Construction of Supporting continuously and is Piecemeal paragraphs excavation, defines the excavation of foundation pit of the segmental that has levels, and first removes according to piecemeal excavation Topsoil, middle slot type excavation, both sides earth excavation, form orderly normalized hydraulic character, reduce Mechanical input, reduces the number of times that cubic metre of earth relay is had bad luck, and improves machinery service efficiency, decreases machine Tool is allocated and transported in digging process back and forth.
3. a kind of ultra-wide hyposmosis mud method of excavation of deep foundation pit as claimed in claim 1, it is characterised in that Described construction method is specific as follows: advance reservation building enclosure back-pressure soil layer during the earth excavation of foundation ditch both sides, Take full advantage of the effect utilizing back-pressure soil under this characteristic of foundation ditch ultra-wide, have employed and stay back-pressure soil to keep propping up Protection structure is stable, and first slotting excavation stays back-pressure soil, has excavated the earthwork of interference under bracing members, then has set up steel Support, then excavation back-pressure soil, it is to avoid in Deep Excavation and bracing members set up between mutual Interference, improves construction speed and excavation efficiency.
4. a kind of ultra-wide hyposmosis mud method of excavation of deep foundation pit as claimed in claim 2, it is characterised in that Step excavate continuously Construction of Supporting according to layering, step by step, symmetrical, balance, five main points in limited time, Follow vertical layered, longitudinal divisions, with digging with support, the principle of quick back cover, every layer of each step Excavate the order by extending after middle grooving to both sides to excavate, in time by design erection steel pipe Support, and to steel pipe support pre-add axial prestress, the deformation of fender post body before minimizing supporting.
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CN106436785A (en) * 2016-11-08 2017-02-22 重庆市基础工程有限公司 Side slope rescuing counter pressure adverse construction method and structure thereof
CN107700493A (en) * 2017-07-14 2018-02-16 腾达建设集团股份有限公司 Basin earthwork excavation method in the small yardstick block of weak soil subway foundation pit
CN107938680A (en) * 2017-11-20 2018-04-20 重庆交通建设(集团)有限责任公司 A kind of excavation of foundation pit safe construction method
CN109706939A (en) * 2019-01-14 2019-05-03 杭州江润科技有限公司 Deep basal pit prestressing combination bracing members and construction method
CN110004934A (en) * 2019-04-11 2019-07-12 中国葛洲坝集团第一工程有限公司 Foundation excavation of silt excavation construction method
CN110158603A (en) * 2019-06-14 2019-08-23 北京翔鲲水务建设有限公司 Long and narrow deep foundation pit earthwork digging method
CN110468940A (en) * 2019-07-26 2019-11-19 中国电建集团华东勘测设计研究院有限公司 A kind of quick supporting excavation construction method without friction of groove
CN110541420A (en) * 2019-08-29 2019-12-06 南京大学 safe mining method and mining structure for valley type domestic garbage landfill

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106436785A (en) * 2016-11-08 2017-02-22 重庆市基础工程有限公司 Side slope rescuing counter pressure adverse construction method and structure thereof
CN106436785B (en) * 2016-11-08 2019-04-26 重庆市基础工程有限公司 Insuring highway' slope back-pressure reversed construction method and its structure
CN107700493A (en) * 2017-07-14 2018-02-16 腾达建设集团股份有限公司 Basin earthwork excavation method in the small yardstick block of weak soil subway foundation pit
CN107700493B (en) * 2017-07-14 2019-08-16 腾达建设集团股份有限公司 Basin earthwork excavation method in the small scale block of weak soil subway foundation pit
CN107938680A (en) * 2017-11-20 2018-04-20 重庆交通建设(集团)有限责任公司 A kind of excavation of foundation pit safe construction method
CN109706939A (en) * 2019-01-14 2019-05-03 杭州江润科技有限公司 Deep basal pit prestressing combination bracing members and construction method
CN109706939B (en) * 2019-01-14 2020-09-15 杭州江润科技有限公司 Deep foundation pit prestress combined steel support and construction method
CN110004934A (en) * 2019-04-11 2019-07-12 中国葛洲坝集团第一工程有限公司 Foundation excavation of silt excavation construction method
CN110004934B (en) * 2019-04-11 2019-12-13 中国葛洲坝集团第一工程有限公司 Excavation construction method for silt foundation pit
CN110158603A (en) * 2019-06-14 2019-08-23 北京翔鲲水务建设有限公司 Long and narrow deep foundation pit earthwork digging method
CN110468940A (en) * 2019-07-26 2019-11-19 中国电建集团华东勘测设计研究院有限公司 A kind of quick supporting excavation construction method without friction of groove
CN110541420A (en) * 2019-08-29 2019-12-06 南京大学 safe mining method and mining structure for valley type domestic garbage landfill

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