CN102535474B - A kind of construction method of deep-foundation pit excavation - Google Patents

A kind of construction method of deep-foundation pit excavation Download PDF

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Publication number
CN102535474B
CN102535474B CN201010585189.7A CN201010585189A CN102535474B CN 102535474 B CN102535474 B CN 102535474B CN 201010585189 A CN201010585189 A CN 201010585189A CN 102535474 B CN102535474 B CN 102535474B
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excavation
construction
earthwork
deep
foundation pit
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CN201010585189.7A
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Chinese (zh)
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CN102535474A (en
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尚宁洲
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五冶集团上海有限公司
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Abstract

A kind of construction method of deep-foundation pit excavation, after foundation pit enclosure structure has been constructed, use digging machine shoveling and the earthwork car earthwork to be transported outward, it is characterized in that comprising the following steps: a, for the first time soil excavation, the while that point three regions being by each corner of foundation ditch, to middle part, well-balanced moving back is dug; B, go along with sb. to guard him braced structures construction and maintenance, build and go along with sb. to guard him braced structures, and support concrete strength reach 80% of design strength after carry out next step construction; C, second time soil excavation, comprise: (1) goes along with sb. to guard him the following soil excavation of braced structures, cuts the earth and earthwork outward transport in (2) shoveling equipment choosing and (3), and the mode adopting secondary to turn over biography carries out cheating interior earthwork transportation by lighter, completes excavation.It is reasonable in design, simple to operate that the construction method of deep-foundation pit excavation of the present invention has construction sequence, and open excavation is safe and reliable and reduce Construction Cost, saves the duration, the obvious advantage of economic benefit.

Description

A kind of construction method of deep-foundation pit excavation

Technical field

The present invention relates to the construction method of a kind of construction work underground deep foundation ditch, specifically, is a kind of construction method of deep-foundation pit excavation.

Background technology

In recent years, building density in city advances along with modernization and constantly increases, because land for building is expensive and commercial interest is considered, or for meeting the requirements such as municipal administration's civil defence, using underground space has also become the emphasis that investor pays close attention to as far as possible, the investor not only pays close attention to height on the ground, more pay close attention to the utilization of the underground space, the Underground Space Excavation degree of depth is more and more darker, excavation environment is day by day complicated, excavation safety problem is corresponding outstanding, in Deep Excavation, security incident is of common occurrence, and deep pit digging also exists a lot of not science, irrational place, support as foundation ditch is provided with several, foundation ditch manufacturing process is numerous and diverse, manufacturing cost is high.

The construction method of therefore known deep-foundation pit excavation also exists above-mentioned all inconvenience and problem.

Summary of the invention

Object of the present invention, is the construction method proposing a kind of safe and reliable deep-foundation pit excavation.

For achieving the above object, technical solution of the present invention is:

A construction method for deep-foundation pit excavation, after foundation pit enclosure structure has been constructed, has used digging machine shoveling and the earthwork car earthwork to be transported outward, it is characterized in that comprising the following steps:

A, for the first time soil excavation, the while that point three regions being by each corner of foundation ditch, to middle part, well-balanced moving back is dug;

B, go along with sb. to guard him braced structures construction and maintenance, build and go along with sb. to guard him braced structures, and support concrete strength reach 80% of design strength after carry out next step construction;

C, second time soil excavation, comprise:

(1) go along with sb. to guard him the following soil excavation of braced structures, point three region excavations, during each region excavation first from fender post edge;

(2) shoveling equipment choosing, PC100 digging machine deeply sinks down into gradually to go along with sb. to guard him bottom braced structures fetch earth along with excavation, the earthwork dug out stays the PC200 digging machine of native face upper edge to carry out concentrating by being stopped at, load onto cubic metre of earth car transports outward, and the little digging machine of PC60 is positioned at bottom foundation ditch and carries out operation;

(3) shoveling and earthwork outward transport, the mode adopting secondary to turn over biography carries out cheating interior earthwork transportation by lighter, completes excavation.

The construction method of deep-foundation pit excavation of the present invention can also be further achieved by the following technical measures.

Aforesaid method, in wherein said step c, arrange three excavation regions, continuous continual excavation is carried out in each excavation region, after having excavated, carries out bed course and Construction of Supporting rapidly.

Aforesaid method, wherein said bed course is smash with watering with digging, and foundation ditch exposed area controls at 120m 2within, and open-assembly time control within 12 hours.

Aforesaid method, in wherein said step c, carries out before shoveling in deep-well precipitation and shoveling process and carries out bright gutter, open fire in foundation ditch of draining in time.

Aforesaid method, in wherein said step c, the earthwork that foundation platform, collecting well downturned portion divide, makes segmentation, alternation excavation during excavation.

Aforesaid method, in wherein said step c, after using digging machine excavation, when remaining the soil layer of about 300mm by hand excavation.

Aforesaid method, in wherein said step c, provides every monitored data in time by monitoring unit, instructs excavation.

Aforesaid method, in wherein said step c, it is in easy flights in 1:1.5 to put slope during excavation, and it is in easy flights in 1:2 that the side slope that longer-term uses puts slope.

After adopting technique scheme, the construction method of deep-foundation pit excavation of the present invention has the following advantages:

1, construction sequence is reasonable in design, simple to operate;

2, open excavation is safe and reliable;

3, reduce Construction Cost, save the duration, economic benefit is obvious.

Accompanying drawing explanation

Fig. 1 is the foundation pit enclosure structure floor map of the embodiment of the present invention;

Fig. 2 is the foundation pit enclosure structure generalized section of the embodiment of the present invention;

Fig. 3 is the first time soil excavation generalized section of the embodiment of the present invention;

Fig. 4 is the second time soil excavation generalized section of the embodiment of the present invention;

Fig. 5 is that the first time soil excavation of the embodiment of the present invention stays native floor map;

Fig. 6 is the first time soil excavation subregion floor map of the embodiment of the present invention;

Fig. 7 is the second time soil excavation floor map of the embodiment of the present invention.

In figure: 1 steel concrete supports, 2 temporary support columns, 3 compaction groutings, 4 drilled piles, 5 first time soil excavation, 6 second time soil excavations, 7 collar tie beams, 8 ends, hole, reinforced, at the bottom of 9 bottom cushions, 10 natural terrace absolute altitudes, 11 firsts support, 12 castinplace piles, 13 deep agitation piles, 14 stand column pile, 15 wait to excavate region, 16 middle transition platforms, 17 foundation ditch peripheries are gone along with sb. to guard him, 18 put backfill region, slope, 19 platform beam slabs, 20 digging machines, 22 soil outlets, 23 holes are outer puts region, slope, 24 first time soil excavation stay native region, 25 entrances, 26 first time the last operating area of soil excavation, 27 first time soil excavation 1# digging machine operating area, 28 first time soil excavation 2# digging machine operating area, 29 first time soil excavation 3# digging machine operating area, 30 is domatic with digging with establishing ladder to put slope, 31 second time soil excavation first operating areas, 32 second time soil excavation second operating areas, 33 second time soil excavation the 3rd operating areas, the 34 second time last operating areas of soil excavation, 35 accesss, 36 unearthed platforms.

Detailed description of the invention

Below in conjunction with embodiment and accompanying drawing thereof, the present invention is illustrated further.

Embodiment 1

Now refer to Fig. 1 and Fig. 2, Fig. 1 is the foundation pit enclosure structure layout schematic diagram of the embodiment of the present invention, and Fig. 2 is the foundation pit enclosure structure generalized section of the embodiment of the present invention.As shown in the figure, described foundation pit enclosure structure is according to known technology castinplace pile 12, deep agitation pile 13, after collar tie beam 7 and compaction grouting 3 have been constructed, excavation of foundation pit form is totally " island puts slope " excavation, at the uniform velocity excavated to centre by fender body, use digging machine 20 shoveling and the earthwork car earthwork to be transported outward, it is characterized in that comprising the following steps:

A, for the first time soil excavation, the while that point three regions 27,28,29 being by each corner of foundation ditch, to middle part, well-balanced moving back is dug;

The design foundation ditch protection class of b, this engineering is secondary, adopts routine techniques to carry out going along with sb. to guard him braced structures construction and maintenance, builds and go along with sb. to guard him braced structures, and carry out next step construction after support concrete strength reaches 80% of design strength;

C, second time soil excavation, comprise:

(1) the following soil excavation of braced structures is gone along with sb. to guard him, divide three regions 31,32,33 excavations, during each region excavation first from fender post 12 edge, and continuous continual excavation is carried out in each excavation region, after having excavated, carry out bed course and Construction of Supporting rapidly, described bed course 9 is smash with watering with digging, and foundation ditch exposed area controls at 120m 2within, and open-assembly time control within 12 hours; Carry out before shoveling in deep-well precipitation and shoveling process and carry out bright gutter, open fire in foundation ditch of draining in time; The earthwork that foundation platform, collecting well downturned portion divide, makes segmentation, alternation excavation during excavation.

(2) shoveling equipment choosing; PC100 digging machine deeply sinks down into gradually to go along with sb. to guard him bottom braced structures fetch earth along with excavation; shoveling shutdown face is arranged on the sandy clay stratum in place; and can ensure that digging machine can freely be walked in support bottom; excavator lower berth subgrade case; the earthwork dug out stays the PC200 digging machine of native face upper edge to carry out concentrating, loading onto a cubic metre of earth car outward transport by being stopped at, and the earthwork that PC100 digging machine digs out all should within the radius of gyration of last layer digging machine work.Because the degree of depth of engineering excavation is comparatively large, still put slope 18 by stepped-style during shoveling, and establish transition platform in centre, berm width is greater than 6m, and the strict grade of side slope that controls is less than 1:1.5.Locally deep pit position (elevator shaft, collecting well etc.) in case of PC100 digging machine can not dig to region, be then equipped with some the lighter little digging machines of PC60 of deadweight by field requirement and be positioned at bottom foundation ditch and carry out operation; First traffic route effectively arranged before excavation, the supporting surface that need pass through at digging machine and earthwork car carries out backfilling of earthwork and tamps.Backfill height is higher than supporting surface 300mm, and walkway board is laid on the support top after backfill, ensure that supporting the point load face that can not produce because of vehicles while passing causes support part to rupture, digging machine not directly walks in supporting surface, after using digging machine excavation, forbid to backbreak in soil excavation process, transport outward all in time after all soil excavations, and by hand excavation when in the end remaining the soil layer of about 300mm, the soil of hand excavation is transported near digging machine in time, taken out of by digging machine, digging machine must not get back in type soil layer face again, disturbance is produced to bearing stratum, produce spongy soil.

(3) to cut the earth and earthwork outward transport, the mode adopting secondary to turn over biography carries out cheating interior earthwork transportation by lighter, and it is in easy flights in 1:1.5 to put slope during excavation, and it is in easy flights in 1:2 that the side slope of longer-term use puts slope; Every monitored data is provided in time by monitoring unit, instruct excavation, to be formed in the middle part of foundation ditch among a small circle " central island " gradually in the mid-term of second time soil excavation, its later stage is when cutting the earth and finish up, simultaneously move back the mode of digging by middle part to both sides soil outlet by work plane outfit 2 ~ 4 groups of digging machines employings to excavate, dig the earthwork to last platform place of being unearthed separately, then coordinate long-armed digging machine to carry out the ending of surplus earth by little digging machine, complete excavation.

Fig. 7 is the second time soil excavation floor map of the embodiment of the present invention, gate, the vehicle each free both sides turnover when digging the last middle part central island earthwork.

The construction method effective depth of deep-foundation pit excavation of the present invention reaches 9.4 meters (11.35 meters, local), but only has the foundation ditch shoveling safety of one foundation ditch support, and whole ground and Foundation Design are completed smoothly.

The construction method of deep-foundation pit excavation of the present invention is used on joint motor square, Shanghai, Be very effective, obtains exploiting entity, supervisor and owner's abundant affirmation.

Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, can also make various conversion or change.Therefore, all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.

Claims (5)

1. a construction method for deep-foundation pit excavation, foundation depth reaches 9.4 meters, after foundation pit enclosure structure has been constructed, has used digging machine shoveling and the earthwork car earthwork to be transported outward, it is characterized in that comprising the following steps:
A, for the first time soil excavation, the while that point three regions being by each corner of foundation ditch, to middle part, well-balanced moving back is dug;
B, go along with sb. to guard him braced structures construction and maintenance, build and go along with sb. to guard him braced structures, and support concrete strength reach 80% of design strength after carry out next step construction;
C, second time soil excavation, comprise:
(1) the following soil excavation of braced structures is gone along with sb. to guard him, divide three regions excavations, during each region excavation first from fender post edge, continuous continual excavation is carried out in each excavation region, after having excavated, carry out bed course and Construction of Supporting rapidly, described bed course is smash with watering with digging, and foundation ditch exposed area controls at 120m 2within, and open-assembly time control within 12 hours; Put slope during excavation in easy flights in 1:1.5, it is in easy flights in 1:2 that the side slope that longer-term uses puts slope;
(2) shoveling equipment choosing, PC100 digging machine deeply sinks down into gradually to go along with sb. to guard him bottom braced structures fetch earth along with excavation, the earthwork dug out stays the PC200 digging machine of native face upper edge to carry out concentrating by being stopped at, load onto cubic metre of earth car transports outward, and the little digging machine of PC60 is positioned at bottom foundation ditch and carries out operation;
(3) shoveling and earthwork outward transport, the mode adopting secondary to turn over biography carries out cheating interior earthwork transportation by lighter, completes excavation.
2. the construction method of deep-foundation pit excavation as claimed in claim 1, is characterized in that, in described step c, carry out in deep-well precipitation and shoveling process and carry out bright gutter, open fire in foundation ditch of draining in time before shoveling.
3. the construction method of deep-foundation pit excavation as claimed in claim 1, it is characterized in that, in described step c, the earthwork that foundation platform, collecting well downturned portion divide, makes segmentation, alternation excavation during excavation.
4. the construction method of deep-foundation pit excavation as claimed in claim 1, is characterized in that, in described step c, after using digging machine excavation, when remaining the soil layer of about 300mm by hand excavation.
5. the construction method of deep-foundation pit excavation as claimed in claim 1, is characterized in that, in described step c, provides every monitored data in time, instruct excavation by monitoring unit.
CN201010585189.7A 2010-12-13 2010-12-13 A kind of construction method of deep-foundation pit excavation CN102535474B (en)

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CN104164878B (en) * 2013-05-20 2016-09-21 中交公路养护工程技术有限公司 A kind of construction method of ultra-large type deep foundation pit earthwork digging
CN104213567B (en) * 2013-05-30 2016-02-03 中国二十冶集团有限公司 Underground pipe gallery controls the construction method of slope section slippage
CN103410152B (en) * 2013-09-05 2015-08-19 中交公路养护工程技术有限公司 A kind of construction method for long and narrow deep foundation pit earthwork digging
CN104099935B (en) * 2014-04-01 2015-10-21 浙江省建筑设计研究院 Column reinforcement means after a kind of foundation pit deepened
CN104631465A (en) * 2014-12-15 2015-05-20 上海市基础工程集团有限公司 Deep foundation pit excavation construction method adopted under pebble bed red sandstone geological condition
CN105544576B (en) * 2016-01-20 2018-06-08 山东科技大学 A kind of foundation pit Yield rainfall relation excavation method
CN106320261B (en) * 2016-08-22 2018-06-08 中交天航港湾建设工程有限公司 A kind of construction method of overlength basin slope excavating
CN108239983B (en) * 2018-01-16 2020-03-24 中铁十九局集团第七工程有限公司 Construction method of deep foundation pit
CN108086327A (en) * 2018-01-19 2018-05-29 浙江省建建设集团有限公司 A kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel
CN108343067B (en) * 2018-02-11 2020-02-07 宁波市明耀智能科技有限公司 Method for excavating foundation pit on soft soil with water content of more than 60 percent
CN108589770A (en) * 2018-05-09 2018-09-28 中铁十二局集团有限公司 Construction method is moved in the retaining wall of subway station

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