CN104790410A - Foundation pit excavation supporting method suitable for watercourse with shallow water and sludge - Google Patents

Foundation pit excavation supporting method suitable for watercourse with shallow water and sludge Download PDF

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Publication number
CN104790410A
CN104790410A CN201510236917.6A CN201510236917A CN104790410A CN 104790410 A CN104790410 A CN 104790410A CN 201510236917 A CN201510236917 A CN 201510236917A CN 104790410 A CN104790410 A CN 104790410A
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CN
China
Prior art keywords
foundation pit
construction
foundation
shallow water
iron
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CN201510236917.6A
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CN104790410B (en
Inventor
高笑娟
赵锐
焦燏烽
梁斌
徐红玉
张独远
聂宁波
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Henan University of Science and Technology
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Henan University of Science and Technology
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Priority to CN201510236917.6A priority Critical patent/CN104790410B/en
Publication of CN104790410A publication Critical patent/CN104790410A/en
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Publication of CN104790410B publication Critical patent/CN104790410B/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/02Restraining of open water
    • E02D19/04Restraining of open water by coffer-dams, e.g. made of sheet piles
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/10Deep foundations
    • E02D27/12Pile foundations
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/02Sheet piles or sheet pile bulkheads
    • E02D5/03Prefabricated parts, e.g. composite sheet piles
    • E02D5/04Prefabricated parts, e.g. composite sheet piles made of steel

Abstract

Provided is a foundation pit excavation supporting method suitable for a watercourse with shallow water and sludge. A construction platform is constructed in the shallow water of the watercourse twice in a filling mode, a supporting structure for foundation pit excavation is established on the construction platform, foundation pit excavation and bearing platform construction are carried out for the second time under the protection of the supporting structure, the foundation pit supporting structure is dismantled after bearing platform construction is finished, and a supporting process can be completed. In combination with specific geological and hydrological characteristics of the watercourse with the shallow water and the sludge, a steel cofferdam and the whole bearing platform and foundation pit excavation supporting structure are constructed by means of common profile steel and a common excavation mechanism and matched with an earth cofferdam in the watercourse, so that under the premise that a bearing platform and foundation pit supporting effect is brought into play, and investment of project capital is reduced substantially. Through tests, compared with a steel sheet pile cofferdam constructed by means of 9m long Larsen steel sheet piles and a creeper truck with a vibration hammer and a mechanical arm, 84.1% of cost can be saved. Because the construction method is simplified, the construction period of a project is greatly shortened.

Description

A kind of Support of Foundation Pit Excavation method being applicable to shallow water mud river course
Technical field
The present invention relates to a kind of river course pile foundation construction method, be especially applicable to the Support of Foundation Pit Excavation method of shallow water mud river course pile foundation bearing platform construction.
Background technology
The development of China's communication makes building of bridge also roll up, and in Bored Pile of Bridge construction, building island cofferdam method is a kind of common mode.Steel cofferdam adopts special construction machinery to squeeze in soil layer by steel sheet pile usually, is ensured the stability of digging process by support system.
In the northern area of China, because amount of precipitation is less, inland river, river course water is more shallow, mostly all within 2 meters, even lower, and due to river flow velocity slow, riverbed deposits a large amount of mud and silt, current steel sheet pile cannot be utilized to construct steel cofferdam and support system, and its reason is: one, and the specification of steel sheet pile is limited, its minimum sandards length is 9m, shallow water river channel pile foundation bearing platform construction is not needed to the fender post of length 9m, therefore its cost is higher, causes waste; They are two years old, the creeper truck that the construction of steel sheet pile needs pedrail crane to join vibrating hammer or band vibrating hammer mechanical arm is construction machinery, high to ground requirement for bearing capacity, and the ground in shallow water mud river course is soft, be unfavorable for that this equipment carries out operation, and this equipment handover charge is higher, and construction organization is more complicated, long construction period.If above-described reason is for pile foundation in deep water bearing platform construction, its cost may be little relative to total cost, but for the construction of shallow water pile foundation cushion cap, its cost is relatively high, and work progress is too complicated.Therefore be necessary to adopt and come compared with the bank material of low cost and simple construction technology, improve the economic benefit of engineering.
Summary of the invention
The object of the present invention is to provide a kind of Support of Foundation Pit Excavation method being applicable to shallow water mud river course, according to the geological hydrology feature in shallow water mud river course, by adopting general i iron as bank material, simplify existing construction technology, under the prerequisite ensureing construction quality, shorten construction period, reduce cost, improve the economic benefit of engineering.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of Support of Foundation Pit Excavation method being applicable to shallow water mud river course; by construction platform in river course shallow water; and on operation platform, set up the supporting and protection structure of excavation of foundation pit; then excavation pit carry out bearing platform construction under the protection of supporting and protection structure; after bearing platform construction complete, remove foundation pit supporting construction, comprise following concrete steps:
Step one, banket construction platform in river course shallow water, and filler effluent limit used advances to the operation platform place of constructing, korneforos gradually, and the width of constructed operation platform upstream face exceeds cap design of pile width 5m;
Step 2, on constructed operation platform, carry out the construction of vertical drilling and foundation pile, described boring is passed down through the mud in river course;
The first excavation of foundation ditch is carried out within the scope of step 3, construction bearing platform setting-out on operation platform, cutting depth is 1m, then fine away in i iron one end length being no more than 6m, by root at excavated foundation ditch edge vertical inserted to play from top to bottom, tip to i iron inserts below mud, and ensure not stay gap between adjacent i iron, to form the steel cofferdam as foundation pit supporting construction, then adopt the i iron end to end inwall around steel cofferdam that waling is installed, and at the Corner Strapped diagonal brace of waling, thus form the supporting and protection structure of foundation ditch;
Step 4, in step 3 the foundation ditch of first excavation basis on again excavate downwards, until 30 ~ 50cm below elevation at the bottom of cap design of pile, clear up cushion cap substrate again and build blinding concrete, then on blinding concrete, constructing cushion cap, between cushion cap and described steel cofferdam, leaving gap;
Step 5, to backfill in the gap between described steel cofferdam and cushion cap, then remove above-mentioned foundation pit supporting construction and can complete supporting to excavation of foundation pit.
In step one, constructing of operation platform comprises filling of twice filler, first time the filler that fills be the clay taken on the spot, filled height higher than river surface 80cm, and after filling steamroller, make the end face of operation platform higher than more than river surface 50cm; During second time is filled, first be trapped among around operation platform with double-deck canvas cloth, the lower edge cobble of canvas cloth and sand pocket are pressed on riverbed, the upper edge of canvas cloth is pressed in the end face of operation platform, secondary filling is carried out as filler at the end face of operation platform again by brick quarrel, and steamroller, until reach the design altitude of operation platform.
The i iron forming steel cofferdam in step 3 adopts 25 types, and in the process of inserted to play, usage mining machine carries out inserted to play, and adopts total powerstation to carry out the position setting-out of i iron, prevents i iron from occurring skew.
Waling in step 3 and diagonal brace adopt 45 type i iron.
In step 4, the thickness of blinding concrete is 10cm, and its upper surface is lower than the upper end of foundation pile in pile foundation.
Described in step 5, the demolishing process of foundation pit supporting construction is as follows: first remove diagonal brace, again the i iron in the steel cofferdam in this face is extracted after removing by the waling of one side one by one in foundation ditch inwall, the i iron dismounting then used the same method the waling in other faces of foundation ditch inwall and steel cofferdam.
Compared with prior art, the present invention has following beneficial effect:
First, the present invention is in conjunction with the distinctive geological hydrology feature in shallow water mud river course, by the supporting and protection structure using common shaped steel and ordinary excavator to build steel cofferdam and whole cushion cap excavation of foundation pit, and match with the earth fill cofferdam in river course, under the prerequisite playing the effect of cushion cap pattern foundation pit supporting structure, significantly reduce the input of engineering funds, through overtesting, compared with the steel sheet-pile cofferdam of constructing with the creeper truck adopting the long Larsen steel sheet pile of 9m with band vibrating hammer mechanical arm, the expense of 84.1% can be saved, and owing to simplifying construction method, shorten the duration of a project greatly;
Second, use method of the present invention that small-sized or medium-sized engineering machinery can be adopted to construct, avoid the big machineries such as giant caterpillar crane to the excessive demand of ground soil bearing capacity, constructability operates, and because the mechanical type used is few, go back constructability tissue.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Fig. 2 is the schematic diagram of operation platform.
Fig. 3 is the schematic diagram of pile foundation construction.
Fig. 4 is the schematic diagram that foundation ditch excavates for the first time.
Fig. 5 is the schematic diagram of foundation pit supporting construction.
Fig. 6 is the top view of foundation pit supporting construction.
Fig. 7 is the schematic diagram of building blinding concrete.
Fig. 8 is the schematic diagram after bearing platform construction.
Fig. 9 is the schematic diagram after foundation pit supporting construction is removed.
Mark in figure: 1, river surface, 2, mud, 3, operation platform, 4, foundation pile, 5, foundation ditch, 6, steel cofferdam, 7, waling, 8, diagonal brace, 9, blinding concrete, 10, cushion cap.
Detailed description of the invention
Below in conjunction with accompanying drawing, by detailed description of the invention, the present invention is further illustrated.
In the present embodiment, certain bridge north side access bridge 1#, 2#, 3#, 4# pier is arranged in shallow water mud river course, the depth of water 1 to 2 meter, riverbed sludge thickness 1 meter, is silt under mud.Pier position all adopts the cofferdam construction drilled pile that bankets, earth fill cofferdam end face absolute altitude 26.0 meters, cushion cap cutting depth average out to 4 meters, because silt depth is wherein 1 meter, if non-support structure in construction, cushion cap foundation ditch directly cannot be excavated at the bottom of cushion cap, so the supporting construction of cushion cap excavation of foundation pit must be carried out.
Be applicable to the Support of Foundation Pit Excavation method in shallow water mud river course, as shown in Figure 1, concrete steps are as follows for its method flow:
Step one: as shown in Figure 2, banket construction platform 3 in shallow water, filler is advisable with the clay taken on the spot, filler is transported to and builds near the river levee of island, and effluent limit starts to advance gradually, avoid filler directly being poured into korneforos and removed earth by washing, the filling width and will exceed design and hold edge of table 5m of operation platform 3 upstream face, first floor filled height exceeds river surface 80cm, after the first floor has filled with road roller by its compacting, the weight of road roller is 18T, now, this builds island end face higher than more than river surface 50cm, then with periphery, double-deck colour bar Bu Jiangzhu island parcel, and use cobble and artificial sand loading bag to be pressed in the lower edge of colour bar cloth, it is made to be close to riverbed, the upper edge of colour bar cloth is pressed in build after on the end face of island carries out secondary filling, build island end face fill 50cm thick Waste brick quarrel and compacting, until reach the design altitude of operation platform 3,
Step 2: as shown in Figure 3, in the operation platform 3 surface vertical drilling from top to bottom that step one is filled, carry out pile foundation construction, described boring will pierce the mud less than 2 in river course, and foundation pile 4 adopts friction pile;
Step 3: as shown in Figures 4 and 5, inserted to play i iron builds the steel cofferdam 6 as pattern foundation pit supporting structure, first with 330 type excavators, the earth fill cofferdam within the scope of construction bearing platform setting-out is carried out to the first excavation of foundation ditch 5, cutting depth is 1m, the shape of excavation is square, then the 25 type i iron that length is no more than 6m are got, is fined away in its termination, and around excavated foundation ditch 5 inwall, by root at foundation ditch 5 edge from top to bottom vertical inserted to play to the termination of i iron insert in the silty sand ground of mud less than 2, and ensure not stay gap between adjacent i iron, to form the steel cofferdam 6 as pattern foundation pit supporting structure, in the inserted to play process of i iron, guarantee dimension of platform size and cushion cap position, prevent the phenomenon appearance that steel cofferdam 6 departs from cushion cap excavating sideline, total powerstation is adopted to carry out the position setting-out of i iron, i iron adopts digging machine extension wire rope to hang and puts in place, inserted to play piecewise,
Step 4: as shown in Figures 5 and 6, the inwall adopting 45 type i-steel supportings to be arranged on the steel cofferdam 6 in above-mentioned steps three forms waling 7, then carry out the installation of diagonal brace 8 in the corner of steel cofferdam 6, after waling 7 to be checked is qualified with diagonal brace 8, carry out the excavation of foundation ditch 5 remainder;
Step 5: as shown in Figure 7, in step 3 foundation ditch 5 excavation foundation on continue excavation downwards, until 30 ~ 50cm below elevation at the bottom of cap design of pile, then the cleaning of cushion cap substrate and building of blinding concrete 9 is carried out, wherein blinding concrete 9 builds thickness is 10cm, and the upper surface of blinding concrete 9 is lower than above-mentioned foundation pile 4 upper end;
Step 6: as shown in Figure 8, carries out cushion cap 10 and constructs in the foundation ditch 5 that step 5 is dug;
Step 7: as can be seen from figures 8 and 9, backfill in the gap between cushion cap 10 and steel cofferdam 6, then diagonal brace 8 is removed, again the support waling 7 in foundation ditch 5 one faces is removed rear use hand fit digging machine the i iron that this face forms steel cofferdam 6 is extracted one by one, then by that analogy the support waling 7 in other faces of foundation ditch 5 and i iron are extracted.
In method of the present invention, the plug of i iron can use medium-sized excavator to construct, walking is convenient, avoid occurring that the big machineries such as giant caterpillar crane are to the situation of the excessive demand of ground soil bearing capacity, easy construction, with strong points, and the plant equipment kind used is few, construction organization is simple, compared with the steel sheet-pile cofferdam of constructing with the creeper truck adopting the long Larsen steel sheet pile of 9m with band vibrating hammer mechanical arm, can save the expense of 84.1%.

Claims (6)

1. one kind is applicable to the Support of Foundation Pit Excavation method in shallow water mud river course; by construction platform (3) in river course shallow water; and on operation platform (3), set up the supporting and protection structure that foundation ditch (5) excavates; then under the protection of supporting and protection structure excavation pit (5) and carry out cushion cap (10) construction; to construct rear dismounting foundation pit supporting construction until cushion cap (10), it is characterized in that: concrete grammar has the following steps:
Step one, in river course shallow water filling construction platform (3), advanced to korneforos operation platform (3) place of constructing gradually on filler effluent limit, the width of operation platform (3) upstream face filled exceeds cushion cap (10) design width 5m;
Step 2, on filled operation platform (3), carry out the construction of vertical drilling and foundation pile (4), described boring is passed down through the mud (2) in river course;
Step 3, the first excavation of foundation ditch (5) is carried out within the scope of construction bearing platform setting-out on operation platform (3), cutting depth is 1m, then fine away in i iron one end length being no more than 6m, by root at excavated foundation ditch (5) edge vertical inserted to play from top to bottom, tip to i iron inserts below mud, and ensure not stay gap between adjacent i iron, to form the steel cofferdam (6) as foundation pit supporting construction, then adopt the i iron end to end inwall around steel cofferdam (6) that waling (7) is installed, and at the Corner Strapped diagonal brace (8) of waling (7), thus form the supporting and protection structure of foundation ditch (5),
Step 4, in step 3 the first excavation of foundation ditch (5) basis on again excavate downwards, until 30 ~ 50cm below cushion cap (10) design end elevation, clear up cushion cap (10) substrate again and build blinding concrete (9), then on blinding concrete (9), construct cushion cap (10), between cushion cap (10) and described steel cofferdam (6), leave gap;
Step 5, to backfill in the gap between described steel cofferdam (6) and cushion cap (10), then remove above-mentioned foundation pit supporting construction and can complete the supporting that foundation ditch (5) is excavated.
2. a kind of Support of Foundation Pit Excavation method being applicable to shallow water mud river course according to claim 1, it is characterized in that: in step one, filling of operation platform (3) comprises twice and fill process, the filler that first time fills is the clay taken on the spot, filled height is higher than river surface (1) 80cm, and after filling steamroller, make the end face of operation platform (3) higher than river surface (1) more than 50cm; During second time is filled, first be trapped among operation platform (3) around with double-deck canvas cloth, the lower edge cobble of canvas cloth and sand pocket are pressed on riverbed, the upper edge of canvas cloth is pressed in the end face of operation platform (3), secondary filling is carried out as filler at the end face of operation platform (3) again by brick quarrel, and steamroller, until reach the design altitude of operation platform (3).
3. a kind of Support of Foundation Pit Excavation method being applicable to shallow water mud river course according to claim 1, it is characterized in that: the i iron forming steel cofferdam (6) in step 3 adopts 25 types, in the process of inserted to play, usage mining machine carries out inserted to play, and adopt total powerstation to carry out the position setting-out of i iron, prevent i iron from occurring skew.
4. a kind of Support of Foundation Pit Excavation method being applicable to shallow water mud river course according to claim 1, is characterized in that: the waling (7) in step 3 and diagonal brace (8) adopt 45 type i iron.
5. a kind of Support of Foundation Pit Excavation method being applicable to shallow water mud river course according to claim 1, is characterized in that: in step 4, the thickness of blinding concrete (9) is 10cm, and its upper surface is lower than the upper end of foundation pile in pile foundation (4).
6. a kind of Support of Foundation Pit Excavation method being applicable to shallow water mud river course according to claim 1, it is characterized in that: described in step 5, the demolishing process of foundation pit supporting construction is as follows: first remove diagonal brace (8), again the i iron in the steel cofferdam (6) in this face is extracted after removing by the waling (7) of one side one by one in foundation ditch (5) inwall, the i iron dismounting then used the same method the waling (7) in other faces of foundation ditch (5) inwall and steel cofferdam (6).
CN201510236917.6A 2015-05-12 2015-05-12 A kind of Support of Foundation Pit Excavation method that is applicable to shallow water mud river course Expired - Fee Related CN104790410B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105133627A (en) * 2015-07-28 2015-12-09 安徽省新路建设工程集团有限责任公司 Construction method for single-wall steel sheet pile cofferdam in running water state
CN105926660A (en) * 2016-04-27 2016-09-07 中国水利水电第四工程局有限公司 Construction method of wind power low pile bearing platform foundation in intertidal zone
CN107514006A (en) * 2017-08-03 2017-12-26 中交铁道设计研究总院有限公司 It is a kind of to build island operation construction method for shallow sea or shallow river bridge foundation
CN108589799A (en) * 2018-05-07 2018-09-28 五冶集团上海有限公司 A method of piling is reduced to Adjacent Buildings vibration effect
CN110552360A (en) * 2019-08-06 2019-12-10 中交一公局第二工程有限公司 Double-row steel pipe pile cofferdam construction method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659677B1 (en) * 1990-03-16 1992-07-10 Leduc Snl Ste Nle PROCESS FOR MAKING SUBMERSIBLE FOUNDATIONS, ESPECIALLY FOR VIADUC PILES.
CN103015446A (en) * 2012-08-10 2013-04-03 中铁大桥局股份有限公司 Method for constructing bearing platform on deepwater and rigid impermeable layer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659677B1 (en) * 1990-03-16 1992-07-10 Leduc Snl Ste Nle PROCESS FOR MAKING SUBMERSIBLE FOUNDATIONS, ESPECIALLY FOR VIADUC PILES.
CN103015446A (en) * 2012-08-10 2013-04-03 中铁大桥局股份有限公司 Method for constructing bearing platform on deepwater and rigid impermeable layer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105133627A (en) * 2015-07-28 2015-12-09 安徽省新路建设工程集团有限责任公司 Construction method for single-wall steel sheet pile cofferdam in running water state
CN105926660A (en) * 2016-04-27 2016-09-07 中国水利水电第四工程局有限公司 Construction method of wind power low pile bearing platform foundation in intertidal zone
CN105926660B (en) * 2016-04-27 2018-05-01 中国水利水电第四工程局有限公司 A kind of construction method on intertidal belt wind electric low pile cap basis
CN107514006A (en) * 2017-08-03 2017-12-26 中交铁道设计研究总院有限公司 It is a kind of to build island operation construction method for shallow sea or shallow river bridge foundation
CN108589799A (en) * 2018-05-07 2018-09-28 五冶集团上海有限公司 A method of piling is reduced to Adjacent Buildings vibration effect
CN110552360A (en) * 2019-08-06 2019-12-10 中交一公局第二工程有限公司 Double-row steel pipe pile cofferdam construction method

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