CN104790410B - A kind of Support of Foundation Pit Excavation method that is applicable to shallow water mud river course - Google Patents
A kind of Support of Foundation Pit Excavation method that is applicable to shallow water mud river course Download PDFInfo
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- CN104790410B CN104790410B CN201510236917.6A CN201510236917A CN104790410B CN 104790410 B CN104790410 B CN 104790410B CN 201510236917 A CN201510236917 A CN 201510236917A CN 104790410 B CN104790410 B CN 104790410B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Earth Drilling (AREA)
- Foundations (AREA)
Abstract
A kind of Support of Foundation Pit Excavation method that is applicable to shallow water mud river course; in river course shallow water, fill construction platform for twice; and on operation platform, set up the supporting construction of excavation of foundation pit; then excavation pit carry out bearing platform construction for the second time under the protection of supporting construction is removed foundation pit supporting construction and can be completed Bracing Process after bearing platform construction completes. The present invention is in conjunction with the distinctive geological hydrology feature in shallow water mud river course, by using common shaped steel and common excavator to build the supporting construction of steel cofferdam and whole cushion cap excavation of foundation pit, and match with the earth cofferdam in river course, playing under the prerequisite of cushion cap pattern foundation pit supporting structure effect, significantly reduce the input of engineering fund, through overtesting, compared with the steel sheet-pile cofferdam that adopts the long Larsen steel sheet pile of 9m to construct with the creeper truck with vibration hammer mechanical arm, can save 84.1% expense, and owing to having simplified construction method, shorten greatly the duration of a project.
Description
Technical field
The present invention relates to a kind of river course pile foundation bearing platform 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 rolls up building also of bridge, and in Bored Pile of Bridge construction, building cofferdam, island method is a kind of common mode. Steel cofferdam adopts special construction machinery that steel sheet pile is squeezed in soil layer conventionally, ensures the stability of digging process by support system.
In the northern area of China, because precipitation is less, inland river, river course water is more shallow, mostly all in 2 meters, even lower, and because river flow velocity is slow, a large amount of mud and silt deposit on riverbed, cannot utilize current steel sheet pile to construct steel cofferdam and support system, its reason is: one, and the specification of steel sheet pile is limited, its minimum sandards length is 9m, the fender post that does not need length 9m for shallow water river channel pile foundation bearing platform construction, therefore its cost is higher, causes waste; They are two years old, the construction of steel sheet pile needs pedrail crane to join vibration hammer or the creeper truck with vibration 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 with respect to total cost, and still, 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 compared with the cofferdam material of low cost and simple construction technology to complete, 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 that is applicable to shallow water mud river course, according to the geological hydrology feature in shallow water mud river course, by adopting general I-steel as cofferdam material, simplify existing construction technology, ensureing under the prerequisite of 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 that is applicable to shallow water mud river course; by construction platform in river course shallow water; and on operation platform, set up the supporting construction of excavation of foundation pit; then excavation pit carry out bearing platform construction under the protection of supporting construction; after bearing platform construction completes, remove foundation pit supporting construction, comprise following concrete steps:
Step 1, the construction platform that bankets in river course shallow water, 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;
Within the scope of step 3, construction bearing platform setting-out on operation platform, carry out the first excavation of foundation ditch, cutting depth is 1m, then fine away in the I-steel one end that length is no more than to 6m, by root at excavated foundation ditch edge vertical inserted to play from top to bottom, to the tip insertion mud of I-steel, and ensure not stay between adjacent I-steel gap, to form the steel cofferdam as foundation pit supporting construction, then adopt the end to end inwall around steel cofferdam of I-steel that waling is installed, and at the Corner Strapped diagonal brace of waling, thereby form the supporting construction of foundation ditch;
Step 4, in step 3, on the basis of the foundation ditch of first excavation, again excavate downwards, until the following 30 ~ 50cm of elevation at the bottom of cap design of pile, clear up again cushion cap substrate and build blinding concrete, then on blinding concrete, constructing cushion cap, between cushion cap and described steel cofferdam, leaving gap;
Step 5, to backfill soil in the gap between described steel cofferdam and cushion cap, then remove above-mentioned foundation pit supporting construction and can complete the supporting to excavation of foundation pit.
In step 1, constructing of operation platform comprises that filling of twice filler, the filler filling are for the first time the clay taking on the spot, and filled height is higher than river surface 80cm, and after filling steamroller, make the end face of operation platform higher than more than river surface 50cm; In filling for the second time, first be trapped among around operation platform with double-deck waterproof cloth, the lower edge of waterproof cloth is pressed on riverbed with cobble and sand pocket, the upper edge of waterproof cloth is pressed in the end face of operation platform, carry out secondary fill as filler at the end face of operation platform by brick quarrel again, and steamroller, until reach the design altitude of operation platform.
The I-steel that forms 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-steel, prevents that skew from appearring in I-steel.
Waling in step 3 and diagonal brace adopt 45 type I-steel.
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.
Demolishing process at foundation pit supporting construction described in step 5 is as follows: first remove diagonal brace, after again the waling of one side in foundation ditch inwall being removed, the I-steel in the steel cofferdam of this face is extracted one by one, then used the same method the I-steel of the waling in other faces of foundation ditch inwall and steel cofferdam is removed.
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 using common shaped steel and common excavator to build the supporting construction of steel cofferdam and whole cushion cap excavation of foundation pit, and match with the earth cofferdam in river course, playing under the prerequisite of cushion cap pattern foundation pit supporting structure effect, significantly reduce the input of engineering fund, through overtesting, compared with the steel sheet-pile cofferdam that adopts the long Larsen steel sheet pile of 9m to construct with the creeper truck with vibration hammer mechanical arm, can save 84.1% expense, and owing to having simplified construction method, shorten greatly the duration of a project;
Second, use method of the present invention can adopt small-sized or medium-sized engineering machinery to construct, avoided the excessive demands of big machinery to ground soil bearing capacity such as large caterpillar car, constructability operation, and because the mechanical type using is few, go back constructability tissue.
Brief description of the drawings
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 of the first excavation of foundation ditch.
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 are arranged in shallow water mud river course, 1 to 2 meter of the depth of water, and 1 meter of riverbed sludge bed thickness, is silt under mud. Pier position all adopts the cofferdam construction drilled pile that bankets, 26.0 meters of earth cofferdam end face absolute altitudes, 4 meters of cushion cap cutting depth average out to, because silt depth is wherein 1 meter, if non-support structure in construction, at the bottom of cushion cap foundation ditch directly cannot being excavated to cushion cap, so must carry out the supporting construction of cushion cap excavation of foundation pit.
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 1: as shown in Figure 2, construction platform 3 bankets in shallow water, filler is advisable with the clay taking on the spot, filler is transported to and is built near the river levee of island, and effluent limit starts to advance gradually, avoid directly pouring filler into korneforos and removed earth by washing, the width of operation platform 3 upstream faces exceeds cushion cap 10 and designs width 5m, 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, Gai Zhu island end face is higher than more than river surface 50cm, then with the peripheral parcel in double-deck colour bar Bu Jiangzhu island, and use cobble and artificial sand loading bag to be pressed in the lower edge of colour bar cloth, make it be close to riverbed, secondary filling carried out after being pressed in and building on the end face of island in the upper edge of colour bar cloth, Zhu island end face fills waste and old brick quarrel the compacting that 50cm is thick, until reach the design altitude of operation platform 3,
Step 2: as shown in Figure 3, the operation platform 3 surfaces vertical drilling from top to bottom filling in step 1, carries out pile foundation construction, described boring will pierce mud in river course below 2, and foundation pile 4 adopts friction pile;
Step 3: as shown in Figures 4 and 5, inserted to play I-steel builds the steel cofferdam 6 as pattern foundation pit supporting structure, first with 330 type excavators, the earth cofferdam within the scope of construction bearing platform setting-out is carried out the first excavation of foundation ditch 5, cutting depth is 1m, excavation be shaped as square, then get the 25 type I-steel that length is no more than 6m, fined away in its termination, and around excavated foundation ditch 5 inwalls, by root at foundation ditch 5 edges from top to bottom vertical inserted to play to the termination of I-steel insert in the flour sand layer of mud below 2, and ensure not stay between adjacent I-steel gap, to form the steel cofferdam 6 as pattern foundation pit supporting structure, in the inserted to play process of I-steel, guarantee dimension of platform size and cushion cap position, prevent the phenomenon appearance that steel cofferdam 6 departs from cushion cap excavation sideline, adopt total powerstation to carry out the position setting-out of I-steel, I-steel adopts digging machine extension steel wire rope to hang and puts in place, inserted to play piecewise,
Step 4: as shown in Figures 5 and 6, adopt 45 type i-steel supportings to be arranged on the inwall of the steel cofferdam 6 in above-mentioned steps three and form waling 7, then four jiaos at steel cofferdam 6 carry out the installation of diagonal brace 8, carry out the excavation of foundation ditch 5 remainders after waling 7 to be checked is qualified with diagonal brace 8;
Step 5: as shown in Figure 7, in step 3, on the excavation foundation of foundation ditch 5, continue excavation downwards, until the following 30 ~ 50cm of elevation at the bottom of cap design of pile, then carry out the cleaning of cushion cap substrate and building of blinding concrete 9, wherein to build thickness be 10cm to blinding concrete 9, and the upper surface of blinding concrete 9 is lower than above-mentioned foundation pile 4 upper ends;
Step 6: as shown in Figure 8, carry out cushion cap 10 in the foundation ditch 5 digging in step 5 and construct;
Step 7: as shown in Fig. 8 and Fig. 9, to backfill soil in the gap between cushion cap 10 and steel cofferdam 6, then remove diagonal brace 8, again the support waling 7 in 5 one faces of foundation ditch is removed to rear use and manually coordinate digging machine that the I-steel of this face formation steel cofferdam 6 is extracted one by one, then by that analogy support waling 7 and I-steel in foundation ditch 5 other faces are extracted.
In method of the present invention, the plug of I-steel can be used medium-sized excavator construction, walking is convenient, avoid occurring the situation of the excessive demands of big machinery to ground soil bearing capacity such as large caterpillar car, easy construction, with strong points, and the plant equipment kind using is few, construction organization is simple, compared with the steel sheet-pile cofferdam that adopts the long Larsen steel sheet pile of 9m to construct with the creeper truck with vibration hammer mechanical arm, can save 84.1% expense.
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 construction of foundation ditch (5) excavation; then excavation pit (5) carry out cushion cap (10) construction under the protection of supporting construction; until cushion cap (10) the rear dismounting foundation pit supporting construction of having constructed, it is characterized in that: concrete grammar has the following steps:
Step 1, in river course shallow water filling construction platform (3), filler effluent limit is advanced to korneforos operation platform (3) place of constructing gradually, the width of operation platform (3) upstream face filling 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, within the scope of construction bearing platform setting-out on operation platform (3), carry out the first excavation of foundation ditch (5), cutting depth is 1m, then fine away in the I-steel one end that length is no more than to 6m, by root at excavated foundation ditch (5) edge vertical inserted to play from top to bottom, to the tip insertion mud of I-steel, and ensure not stay between adjacent I-steel gap, to form the steel cofferdam (6) as foundation pit supporting construction, then adopt the end to end inwall around steel cofferdam (6) of I-steel that waling (7) is installed, and at the Corner Strapped diagonal brace (8) of waling (7), thereby form the supporting construction of foundation ditch (5),
Step 4, in step 3, on the basis of the first excavation of foundation ditch (5), again excavate downwards, until the following 30 ~ 50cm of cushion cap (10) design end elevation, clear up again cushion cap (10) substrate 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 soil 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 to foundation ditch (5) excavation.
2. a kind of Support of Foundation Pit Excavation method that is applicable to shallow water mud river course according to claim 1, it is characterized in that: the filling of operation platform in step 1 (3) comprises fills process twice, the filler filling is for the first time the clay taking on the spot, filled height is higher than river surface (1) 80cm, and after filling steamroller, the end face that makes operation platform (3) is higher than river surface (1) more than 50cm; In filling for the second time, first be trapped among operation platform (3) around with double-deck waterproof cloth, the lower edge of waterproof cloth is pressed on riverbed with cobble and sand pocket, the upper edge of waterproof cloth is pressed in the end face of operation platform (3), carry out secondary fill as filler at the end face of operation platform (3) by brick quarrel again, and steamroller, until reach the design altitude of operation platform (3).
3. a kind of Support of Foundation Pit Excavation method that is applicable to shallow water mud river course according to claim 1, it is characterized in that: the I-steel that forms 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-steel, prevent that skew from appearring in I-steel.
4. a kind of Support of Foundation Pit Excavation method that is 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-steel.
5. a kind of Support of Foundation Pit Excavation method that is applicable to shallow water mud river course according to claim 1, is characterized in that: the thickness of blinding concrete in step 4 (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 that is applicable to shallow water mud river course according to claim 1, it is characterized in that: the demolishing process at foundation pit supporting construction described in step 5 is as follows: first remove diagonal brace (8), after again the waling (7) of one side in foundation ditch (5) inwall being removed, the I-steel in the steel cofferdam of this face (6) is extracted one by one, then used the same method the I-steel of the waling (7) in other faces of foundation ditch (5) inwall and steel cofferdam (6) is removed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510236917.6A CN104790410B (en) | 2015-05-12 | 2015-05-12 | A kind of Support of Foundation Pit Excavation method that is applicable to shallow water mud river course |
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| CN201510236917.6A CN104790410B (en) | 2015-05-12 | 2015-05-12 | A kind of Support of Foundation Pit Excavation method that is applicable to shallow water mud river course |
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| CN104790410A CN104790410A (en) | 2015-07-22 |
| CN104790410B true CN104790410B (en) | 2016-05-25 |
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| CN105133627B (en) * | 2015-07-28 | 2017-03-01 | 安徽省新路建设工程集团有限责任公司 | Construction under single wall steel sheet-pile cofferdam flowing water state |
| 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 |
| CN115012393A (en) * | 2022-06-21 | 2022-09-06 | 中铁六局集团有限公司 | Construction method for bearing platform under weakly weathered rock stratum riverbed |
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| FR2659677B1 (en) * | 1990-03-16 | 1992-07-10 | Leduc Snl Ste Nle | PROCESS FOR MAKING SUBMERSIBLE FOUNDATIONS, ESPECIALLY FOR VIADUC PILES. |
| CN103015446B (en) * | 2012-08-10 | 2014-11-05 | 中铁大桥局股份有限公司 | Method for constructing bearing platform on deepwater and rigid impermeable layer |
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