CN1048306C - Method for making soft foundation basement protecting structure - Google Patents
Method for making soft foundation basement protecting structure Download PDFInfo
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- CN1048306C CN1048306C CN 94103717 CN94103717A CN1048306C CN 1048306 C CN1048306 C CN 1048306C CN 94103717 CN94103717 CN 94103717 CN 94103717 A CN94103717 A CN 94103717A CN 1048306 C CN1048306 C CN 1048306C
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- stake
- basement
- enclosing structure
- space enclosing
- pile
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Abstract
The present invention provides a method for forming an enclosure structure of a basement with a soft soil foundation, which is characterized in that the enclosure structure uses an annular plane and comprises double rows or three rows of enclosure piles arranged loosely, wherein the pile length is 1.6 to 2.5 times of the width of a foundation pit, the pile diameter is 1/20 to 1/25 of the pile length, and the space between two adjacent enclosure piles is 1 to 2 times of the pile diameter. Cement mixing piles are arranged between two rows of enclosure piles, one pulling anchor is arranged at every 5 to 8 pile positions outside the enclosure piles, or stack piles are arranged at one side of the corresponding cement mixing piles, wherein supports are arranged between the stack piles or the corresponding enclosure piles and the foundation bed of a basement, and one end of each pulling anchor or the pile tops of the stack piles and the pile tops of all enclosure piles and cement mixing piles are connected into a whole through a top beam.
Description
The invention belongs to the method for arranging of building of Foundation Design foundation dredging retaining wall or protecting wall.Particularly soft foundation excavates the construction method of basement space enclosing structure.
The delta of great river estuary is mostly formed by silt alluviation all over the world, and the weak soil layer is grown obvious especially, and modern age, the metropolis much all was positioned on these deltas, and high building stands in great numbers in the city, often caves in when making basement in high rise building excavation soft foundation.How rectangular the foundation ditch plane of basement foundation dredging is in the prior art, the perisporium of foundation ditch is the plane, adopt the big diameter borehole filling pile of beating cantilever sheet pile wall or solid matter in the perisporium, the space enclosing structure during as basement foundation dredging and construction is to prevent the landslide of weak soil.But because the spatial form of foundation ditch has determined that space enclosing structure is curved to be subjected on the whole, therefore the fender post as the space enclosing structure part also is to be subjected to curved structural element, and be in the cantilever duty, its effect of being bent is fairly obvious, the calculation of Bending Moment formula is Ma=Ph/3, wherein thrust P=1/2rh
2Tg
2(45 °-Φ/2), thrust of earth P and excavation of foundation pit degree of depth h square are directly proportional, obviously heal when dark when cutting depth, the diameter of fender post also will increase considerably with stake is long, general stake is long to be 3～3.5 times of foundation depth, the stake footpath be stake long 1/20～1/25 (general stake footpath is 800mm～1500mm), not only take a lot of work, take material, and the landslide accident in basement when excavation still constantly takes place, and of becoming in the Foundation Design is long-standing.
The objective of the invention is to provide a kind of construction method of improved soft foundation basement space enclosing structure.Build space enclosing structure in this way, not only can reduce cost significantly, and safe and reliable, can prevent the peripheral ground of foundation ditch earth fall side effectively.
Task of the present invention is finished as follows.
A kind of construction method of soft foundation basement space enclosing structure, comprise: the flat shape of basement space enclosing structure is selected the annular of sealing for use, the shape trend is provided with fender posts double or three row's white-outs along the space enclosing structure of setting is flat, described fender post stake is long be foundation depth 1.6-2.5 doubly, the stake footpath is the long 1/20-1/25 of stake, clearance distance between adjacent two is 1-2 a times of stake footpath, between two row's fender posts, be provided with cement mixing pile, the long foundation depth of slightly being longer than of stake of described cement mixing pile, the stake footpath is the long 1/10-1/15 of stake, outside described fender post, being provided with one every 5-8 stake position draws anchor or is drawing the anchor position to put corresponding cement mixing pile inwall buttress is set with described, a described end of anchor or the stake top of buttress stake of drawing, and the stake top of all fender posts and cement mixing pile links together by back timber and constitutes space enclosing structure integral body, in the bed course on basement basis and buttress stake or with drawing the anchor position to put to arrange between the fender post in corresponding support is set.
Basement space enclosing structure construction method of the present invention, its fender post can be vibrations castinplace pile or preformed pile or bored pile.
The construction method of basement space enclosing structure of the present invention, its pull bar that draws anchor is a reinforcing bar, the other end of pull bar and anchor into the welding of underground steel sheet pile.
The construction method of basement space enclosing structure of the present invention, the stake of its buttress stake is long, the stake footpath can be identical with fender post with pilework.
The construction method of basement space enclosing structure of the present invention, its support can be with reinforced concrete member or shaped steel or round log.
The construction method of basement space enclosing structure of the present invention, the triangle soil of row's fender post inboard in keeping during its basement foundation ditch excavation.
The construction method of soft foundation basement space enclosing structure of the present invention is because the foundation ditch flat shape is selected the annular of sealing for use, the space enclosing structure spatial form of She Dinging has determined space enclosing structure on the whole based on pressurized thus, the formula that is stressed is Na=Kahr, wherein r is the closed ring radius, COEFFICIENT K a=tg
2(45 °-Φ/2), pressure only and the first power of foundation depth h be directly proportional, the foundation ditch lateral thrust of weak soil on every side reduces greatly.Obviously more much smaller based on the member of pressurized than being subjected to curved scantling, on fender post stake top back timber is set, draw anchor or buttress stake every a determining deviation setting, after between basement foundation pad and the buttress stake horizontal support being set, the effect of leaving behind on having played and supportting, therefore the strength of the rigidity of whole space enclosing structure and retaining soil increases greatly, and the fender post size of bearing pressure is also reduced thereupon greatly.After being set, cement mixing pile can prevent foundation ditch foundation soil infiltration on every side.(the basement absolute altitude is-7.4m the about 3000m of land area to same experimental project with known technology and the technology of the present invention
2) design done, comparing result is listed as follows:
Above-mentioned theory and design result show that the present invention can prevent the peripheral ground of foundation ditch earth fall side compared to the prior art effectively, have safely, can reduce significantly the advantage of cost.
| The contrast project | Known technology | The technology of the present invention |
| The flat shape of space enclosing structure | Rectangle, girth 220m | Annular, girth 200m have shortened 20 meters |
| Fender post | Adopt 250 of solid matter bored piles, the long 22m of stake, stake footpath 900mm, the about 3500m of steel concrete amount 3 | Adopt 5 40 of double white-out vibrations castinplace piles, the long average 10m of stake, stake footpath 426mm, the about 770m of steel concrete amount 3 |
| Accessory structure | Back timber 1.3 * 0.3 * 220=85.83 | 250 of cement mixing piles, the long 7m of stake, stake footpath 500mm, cement mixing pile cumulative volume 340m 3, back timber size 1.3 * 0.3 * 200m, steel concrete consumption 80m 3Draw anchor and support 35 pairs |
| The fender post duty | The easy horizontal movement of cantilever pile and caving in | On the support of leaving behind, the main annular pressurized of whole space enclosing structure, rigidity strengthens, fender post is not easy horizontal shift, the percolation-proof performance is good |
| Cost | About 4,900,000 | About 1,200,000 |
| The space enclosing structure duration | Can only beat 1-2 root bored pile every day, completion in 5 months | Can beat 25-30 vibrations castinplace pile every day, completion in 3 months |
Below with reference to accompanying drawing the technology of the present invention is described in further detail
Fig. 1 is the layout plan of basement space enclosing structure of the present invention
Fig. 2 is along the sectional view of A-A line among Fig. 1
Fig. 3 is along the sectional view of B-B line among Fig. 1
Consult Fig. 1, fender post 1 adopts double-row pile, clearance distance between adjacent two fender posts is 1-2 a times of stake footpath, be provided with cement mixing pile 2 between two row's fender posts, be provided with every 5-8 (among the figure being 7) stake and draw anchor 3, it is described that to draw the pull bar of anchor be that the major diameter reinforcing bar (is generally Φ 28-Φ 36 screw-thread steels, length is generally 12-18m), one end of reinforcing bar is welded on the steel sheet pile of squeezing into terrace and (is generally three, squeeze into that the degree of depth is about 3 meters in the soil), when the place outside the space enclosing structure is limited, also can 2-3 buttress stake 4 be set in the cement mixing pile inboard of correspondence with drawing anchor to change into.Corresponding with the position of drawing anchor 3 or buttress stake 4, between fender post 1 or buttress stake 4 and basement foundation pad 6, support 7 is set, described support can be used reinforced concrete member, shaped steel, also can use round log.The stake top of the described other end that draws anchor or buttress stake stake top and fender post, cement mixing pile constitutes space enclosing structure integral body together by back timber 5.Fender post, buttress stake can be with shaking castinplace pile or steel sheet pile or bored pile or preformed pile, label is generally C20 on the coagulation, the length of fender post is 1.6-2.5 times of foundation depth, the present embodiment foundation depth is 7-8m, therefore stake is long is 9-12m, and the stake footpath is Φ 426, and cement mixing pile forms after stirring water leaking-in or underground water with straight cement, the stake footpath is Φ 500, and the long foundation depth of slightly being longer than of stake gets final product.The cross sectional dimensions of back timber is 1500 * 300mm.Shown the situation of drawing anchor 3 that is provided with among Fig. 2.Shown the inconvenient situation of using buttress stake 4 when drawing anchor instead of establishing among Fig. 3.In order to strengthen the ability of space enclosing structure retaining soil, keep on the triangle 8 in the inboard of lining row's fender post, triangle soil is not answered disturbance, and the outer surface water of space enclosing structure is got rid of by gutter 9, and the surface water in the space enclosing structure in the foundation ditch adopts collecting well to concentrate discharging.Having only could excavation pit when the concrete strength of back timber 5 reaches 70%.
Claims (9)
1, a kind of construction method of soft foundation basement space enclosing structure comprises:
The flat shape of a, basement space enclosing structure is selected the annular of sealing for use,
B, fender posts (1) double or three row's white-outs are set along the space enclosing structure flat shape trend of setting, described fender post stake is long be foundation depth 1.6-2.5 doubly, the stake footpath is the long 1/20-1/25 of stake, the clearance distance between adjacent two be the stake footpath 1-2 doubly,
C, be provided with cement mixing pile (2) between the fender posts two rows, the long foundation depth of slightly being longer than of stake of described cement mixing pile, the stake footpath be a long 1/10-1/15,
D, outside described fender post, be provided with one every 5-8 stake position and draw anchor (3) or drawing the anchor position to put corresponding cement mixing pile inwall buttress (4) is set with described
The stake top of e, a described end that draws anchor or buttress stake, and the stake top of all fender posts and cement mixing pile is by back timber (5) the formation space enclosing structure integral body that links together,
F, basement foundation pad (6) and buttress stake (4) or with draw anchor (3) position corresponding in arrange support (7) be set between the fender post (1).
2, the construction method of basement space enclosing structure according to claim 1 is characterized in that described fender post is vibrations castinplace pile or preformed pile or bored pile.
3, the construction method of basement space enclosing structure according to claim 1 and 2 is characterized in that described to draw the pull bar of anchor be reinforcing bar, the other end of pull bar and anchor into underground steel sheet pile welding.
4, the construction method of basement space enclosing structure according to claim 1 and 2 is characterized in that the stake of described buttress stake is long, the stake footpath is identical with fender post (1) with pilework.
5, the construction method of basement space enclosing structure according to claim 1 and 2 is characterized in that described support makes horizontal support with reinforced concrete member or shaped steel or round log.
6, the construction method of basement space enclosing structure according to claim 1 and 2, the triangle soil (8) of row's fender post inboard in keeping when it is characterized in that the basement foundation ditch excavation.
7, the construction method of basement space enclosing structure according to claim 3, the triangle soil (8) of row's fender post inboard in keeping when it is characterized in that the basement foundation ditch excavation.
8, the construction method of basement space enclosing structure according to claim 4, the triangle soil (8) of row's fender post inboard in keeping when it is characterized in that the basement foundation ditch excavation.
9, the construction method of basement space enclosing structure according to claim 5, the triangle soil (8) of row's fender post inboard in it is characterized in that keeping when described basement foundation ditch excavates, an end that supports (7) contacts with lining row's fender post (1) through the bottom of described triangle soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94103717 CN1048306C (en) | 1994-04-04 | 1994-04-04 | Method for making soft foundation basement protecting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94103717 CN1048306C (en) | 1994-04-04 | 1994-04-04 | Method for making soft foundation basement protecting structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1110352A CN1110352A (en) | 1995-10-18 |
| CN1048306C true CN1048306C (en) | 2000-01-12 |
Family
ID=5031237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94103717 Expired - Fee Related CN1048306C (en) | 1994-04-04 | 1994-04-04 | Method for making soft foundation basement protecting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1048306C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313681C (en) * | 2005-02-28 | 2007-05-02 | 王凯 | Binding anti-slide pile structure and construction method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775807B (en) * | 2010-03-03 | 2011-09-21 | 天津二十冶建设有限公司 | Structure for supporting deep foundation pit of soft soil foundation |
| CN102383432A (en) * | 2011-02-23 | 2012-03-21 | 上海城地建设发展有限公司 | Enclosure method for inserting H-shaped reinforced concrete slab piles in three-axis (two-axis) cement mixing pile |
| CN103469800A (en) * | 2012-06-06 | 2013-12-25 | 中国二十冶集团有限公司 | Cement mixing pile composite supporting system provided with peripheral concrete members |
| CN102966108B (en) * | 2012-11-23 | 2014-10-08 | 中铁四局集团建筑工程有限公司 | Construction method of deep foundation pit close to building and adopting underground structure as internal support |
| CN103215959B (en) * | 2013-04-17 | 2016-03-09 | 杨众 | The support construction method that V-arrangement preformed pile is combined with agitation pile |
| CN105019472B (en) * | 2015-07-14 | 2017-01-18 | 周兆弟 | Composite fender pile for building basement |
| CN105019400B (en) * | 2015-07-14 | 2017-01-04 | 周兆弟 | Compound supporting pile structure |
-
1994
- 1994-04-04 CN CN 94103717 patent/CN1048306C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313681C (en) * | 2005-02-28 | 2007-05-02 | 王凯 | Binding anti-slide pile structure and construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1110352A (en) | 1995-10-18 |
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