CN103410156B - Support space enclosing structure and application process thereof before a kind of recyclable vertical type steel pipe - Google Patents
Support space enclosing structure and application process thereof before a kind of recyclable vertical type steel pipe Download PDFInfo
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- CN103410156B CN103410156B CN201310380449.0A CN201310380449A CN103410156B CN 103410156 B CN103410156 B CN 103410156B CN 201310380449 A CN201310380449 A CN 201310380449A CN 103410156 B CN103410156 B CN 103410156B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 135
- 239000010959 steel Substances 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 59
- 239000004568 cement Substances 0.000 claims abstract description 49
- 238000009412 basement excavation Methods 0.000 claims description 27
- 238000007569 slipcasting Methods 0.000 claims description 11
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000004567 concrete Substances 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 16
- 238000010008 shearing Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 238000013019 agitation Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Abstract
The invention belongs to base pit engineering technical field, support space enclosing structure and application process thereof before being specifically related to a kind of recyclable vertical type steel pipe, it is characterized in that described space enclosing structure comprises the collar tie beam that bears down on one, Soil-cement Wall and at least three group steel pipes; Described Soil-cement Wall is positioned at centre position and vertically with the described collar tie beam that bears down on one arranges, one end of steel pipe described in three groups is connected and fixed with the described collar tie beam that bears down on one respectively, in steel pipe described in three groups, the group steel pipe being arranged in centre position is vertical with the described collar tie beam that bears down on one to be arranged and is positioned at described Soil-cement Wall inside, other two groups of steel pipes lay respectively at the inside and outside both sides of described middle group of steel pipe, and angularly arrange with described middle group of steel pipe.Advantage of the present invention is, structure installment is simple with dismounting, constructability, reusable edible, environmental protection; Cost is low, and it is convenient to promote; Have reinforcement antiskid, gear soil, sealing multiple action concurrently, anti-slide performance, the resistance capacity to deformation of going along with sb. to guard him the soil body in scope significantly improve.
Description
Technical field
The invention belongs to base pit engineering technical field, being specifically related to a kind of for supportting space enclosing structure and application process thereof before the recyclable vertical type steel pipe of soft soil foundation pit.
Background technology
For the base pit engineering within the scope of the cutting depth 5m of soft clay area, the space enclosing structure form used in current existing support technology generally adopts Cement-soil Gravity enclosure wall, shaped steel Soil-cement Wall, puts slope excavation.
To be this soil-baffling structure be made up of multiple row lap connection " grid-like " cement earth pile in length and breadth Cement-soil Gravity enclosure wall feature, described cement earth pile is for curing compound with cement based material, shotcrete construction is adopted curing compound and foundation soil to be stirred by force by Mixing Machine, reinforcing body barricade that form lap connection, that have certain thickness and building-in depth, rely on the passive earth pressure stabilization wall of the following soil body in excavation of foundation pit face before body of wall deadweight, frictional resistance at the bottom of wall and wall, to meet the requirements such as the monolithic stability of enclosure wall, stability against over turning, Against Sliding Stability and control deformation of wall.Its advantage is: without supporting in general hole, be convenient to quick shoveling, has the dual-use function of gear soil and sealing concurrently.Shortcoming is that Bit andits control ability is more weak, construction quality is difficult to control, economy is general.
Shaped steel Soil-cement Wall is that the compound inserting shaped steel formation in the triaxial cement stake of lap connection keeps off native waterproof structure.There is applicable soil property scope comparatively wide, the advantages such as, barrier performance good, environmental protection and energy saving, suitable soil layer scope wide, duration short, reduced investment little to surrounding environment influence.But higher for the foundation ditch every meter cost within 5m, and construction requirement is higher, cement piling quality is wayward.
Putting slope excavation is that the Pit Excavation Methods establishing oblique slight slope is stayed in a kind of employing, it is characterized in that under non-support measure, by strengthening width suitable for reading of cutting the earth, taking classification to put the ancillary method of the maintenance stabilities of slope such as slope, bank protection, precipitation simultaneously, native wall avalanche can be prevented, keep stability of slope in digging process, have the duration shorter, the advantage that cost is low, shortcoming puts slope, slope ratio to require larger, stability of slope requirement and width requirement suitable for reading need be met simultaneously, and larger on surrounding enviroment impact.
In sum, current foundation pit supporting construction also cannot recycle and reuse, to reduce construction cost.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, space enclosing structure and application process thereof is supportted before a kind of recyclable vertical type steel pipe is provided, this space enclosing structure arranges by certain distance foundation ditch sideline outside the fabricated construction be made up of the collar tie beam that bears down on one, Soil-cement Wall and at least three group steel pipes, to reach enhancing Foundation Pit wall stability and the recyclable object of space enclosing structure.
The object of the invention realizes being completed by following technical scheme:
Before a kind of recyclable vertical type steel pipe, support space enclosing structure, relates to soft soil foundation pit, it is characterized in that described space enclosing structure comprises the collar tie beam that bears down on one, Soil-cement Wall and at least three group steel pipes; Described Soil-cement Wall is positioned at centre position and vertically with the described collar tie beam that bears down on one arranges, one end of steel pipe described in three groups is connected and fixed with the described collar tie beam that bears down on one respectively, in steel pipe described in three groups, the group steel pipe being arranged in centre position is vertical with the described collar tie beam that bears down on one to be arranged and is positioned at described Soil-cement Wall inside, other two groups of steel pipes lay respectively at the inside and outside both sides of described middle group of steel pipe, and angularly arrange with described middle group of steel pipe.
Often organize described steel pipe to be at least made up of row's steel pipe.
Described Soil-cement Wall is made up of two row's Double shaft stirring stakes of lap connection, has described middle group of steel pipe in described Soil-cement Wall.
Described middle group of steel pipe comprises two row's steel pipes, often arranges steel pipe and arranges formation by long and short steel pipe alternate intervals.
Described be connected and fixed refer to described in bear down on one on collar tie beam there is at least one group of locating hole, in steel pipe described in three groups, outer group of steel pipe stretches in described locating hole corresponding with it, and fixed by bolt and backing plate and the described collar tie beam that bears down on one, steel pipe described in all the other two groups and the described collar tie beam that bears down on one are structure as a whole.
A kind of application process relating to above-mentioned recyclable vertical type steel pipe front support space enclosing structure, it is characterized in that at least comprising the steps: that stepping back a distance in foundation ditch sideline applies described Soil-cement Wall, described middle group of steel pipe is vertically inserted in described Soil-cement Wall inner, and its top certain length is reserved outside described Soil-cement Wall; Go deep into the soil body inside foundation ditch until certain depth bottom foundation ditch by oblique for interior group of steel pipe, by a slip casting steel pipe to described interior group of steel pipe bottom slip casting to form anchoring body, described oblique concrete finger is towards the excavation direction of described foundation ditch; The collar tie beam that bears down on one described in building is integrally formed structure to make the top of described middle group of steel pipe and interior group of steel pipe with it, at least reserves one group of locating hole thereon simultaneously; Bear down on one described in being passed by outer group of steel pipe locating hole on collar tie beam obliquely go deep into the soil body, and its bottom is connected with the earth anchor in the soil body, and its top is fixed by bolt and backing plate and the described collar tie beam that bears down on one, the excavation direction of described oblique concrete finger described foundation ditch dorsad; The soil body inside the described Soil-cement Wall of the upright excavation of fluting, and build reinforced bed in time at the end, hole, put slope excavation in described foundation ditch after the soil body.
Described Soil-cement Wall apply the cutting depth that the degree of depth is greater than described foundation ditch.
The oblique degree of depth going deep into the soil body of described outer group of steel pipe is greater than the cutting depth of described foundation ditch.
Advantage of the present invention is, have both reinforcement, gear soil, sealing multiple action, constrain soil deformation, enhance Foundation Pit wall stability, can uprightly excavate, avoid routine and put the large problem in excavation method occupied ground face, slope, significantly reduce traditional cements soil gravity enclosure wall and the shaped steel Soil-cement Wall scale of construction, overcome its speed of application slow, cost is high simultaneously, the shortcomings such as wall quality is wayward, widely can be applied to base pit engineering within the 7m of soft clay area; Utilize the feature that steel tubular structure can conveniently be pulled out, recyclable after construction, disposable input, recycles, and economy can strengthen greatly.
Accompanying drawing explanation
Fig. 1 is the overall schematic of space enclosing structure in the present invention;
Fig. 2 is the floor map of collar tie beam of bearing down on one in the present invention.
Detailed description of the invention
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technician of the same trade:
Be respectively as marked 1-12 in Fig. 1-2, figure: the collar tie beam 1 that bears down on one, Soil-cement Wall 2, middle group leader's steel pipe 3, middle group of short steel pipes 4, outer group of steel pipe 5, earth anchor 6, bolt and cushion block 7, locating hole 8, interior group of steel pipe 9, slip casting steel pipe 10, anchoring body 11, reinforced bed 12.
Embodiment: as Fig. 1, shown in 2, the present embodiment is specifically related to a kind of for supportting space enclosing structure and application process thereof before the recyclable vertical type steel pipe of soft soil foundation pit, this space enclosing structure is by the collar tie beam 1 that bears down on one, Soil-cement Wall 2, outer group of steel pipe 5, middle group of steel pipe 3 and 4, interior group of steel pipe 9, reinforced bed 12 is combined to form, have both reinforcement, gear soil, sealing multiple action, constrain soil deformation, enhance Foundation Pit wall stability, can uprightly excavate, avoid routine and put the large problem in excavation method occupied ground face, slope, significantly reduce traditional cements soil gravity enclosure wall and the shaped steel Soil-cement Wall scale of construction simultaneously, overcome its speed of application slow, cost is high, the shortcomings such as wall quality is wayward, utilize the feature that steel tubular structure can conveniently be pulled out, recyclable after construction, disposable input, recycles, and economy can strengthen greatly.
As shown in Figure 1, 2, the collar tie beam 1 that bears down on one, for monolithic reinforced concrete structure, is specifically arranged along ground foundation ditch sideline, is reserved with one group of locating hole 8 in position in the outer part at it.
As shown in Figure 1, 2, Soil-cement Wall 2 is arranged in certain distance outside excavation of foundation pit sideline equally, and arrange perpendicular to the collar tie beam 1 that bears down on one, the body of wall that it is specifically made up of two row's dual spindle soil-cement agitation piles of lap connection, possess gear soil and sealing double action, about its length going deep into the soil body is about the twice of the excavation of foundation pit degree of depth.In order to refinforced cement soil stirs the horizontal shearing resistance of wall 2, bending resistance, and improve the ability of body of wall in the resistance to deformation of excavation of foundation pit stage, often arrange in cement mixing method in Soil-cement Wall 2 inside and vertically replace group leader's steel pipe 3 and middle group of short steel pipes 4 in uniform intervals interpolation at a certain distance, form two row's steel pipes, wherein the diameter of middle group leader's steel pipe 3 is more than or equal to the diameter of middle group of short steel pipes 4, middle group leader's steel pipe 3 intubating length extends at the bottom of the wall of Soil-cement Wall 2, middle group of short steel pipes 4 intubating length extends to excavation of foundation pit depth, the steel pipe of both all reserved certain distances in top is exposed to body of wall, to fix with follow-up collar tie beam 1 formed by integrally casting that bears down on one of building.The steel pipe of long and short combination can the shearing resistance of refinforced cement soil agitation pile, bending resistance, there is certain economy simultaneously.
As shown in Figure 1, interior group of steel pipe 9 is as inner support, improve retaining wall resistance to capsizing, and retrain soil deformation, the row of this interior group of steel pipe 9 is a row, certainly many rows can also be selected according to the actual conditions of body of wall and soil mass of foundation pit, it is arranged in the foundation ditch soil body and below the collar tie beam 1 that bears down on one, towards excavation of foundation pit direction every the oblique layout of certain level spacing, its top is fixed with collar tie beam 1 formed by integrally casting that bears down on one, bottom connects slip casting steel pipe 10 and is positioned among the following soil body in the end, hole, anchoring body 11 is formed in its bottom by slip casting, to strengthen the restriction ability of the interior group of steel pipe 9 bottom soil body, to improve base pit stability.
As shown in Figure 1, 2, outer group of steel pipe 5 is for preventing soil body slipping, strengthen soil strength, its row is at least one row, is positioned at the outer soil body of foundation ditch, and in the below of bearing down on one collar tie beam 1, excavation of foundation pit direction is every the oblique layout of certain level spacing dorsad, its top is stretched in the reserved locating hole 8 that bears down on one on collar tie beam 1, and is fixed on by bolt and cushion block 7 and bears down on one on collar tie beam 1, forms fabricated construction in order to recovery.Outer group of steel pipe 5 bottom connects earth anchor 6, by the fastening effect of earth anchor 6 with deep soil, strengthens resistance to plucking and the anti-slide performance of outer group steel pipe 5.
It should be noted that, the width of Soil-cement Wall 2 and the degree of depth, the level interval of middle group leader's steel pipe 3, middle group of short steel pipes 4, outer group of steel pipe 5, interior group of steel pipe 9, the row of outer group of steel pipe 5, length and inclination angle, the length of internal resistance steel pipe 9 and inclination angle, all need to determine according to foundation soil body character, and meet the requirement of deep pit monitor stable calculation.It is required to determine that it; no matter be Soil-cement Wall; or middle group leader's steel pipe 3, middle group of short steel pipes 4, outer group of steel pipe 5; and interior group of steel pipe 9; its degree of depth going deep into the soil body is all greater than the degree of depth of excavation of foundation pit; the object done so effectively can guarantee that the soil body in the excavation of foundation pit degree of depth obtains effective support and enhancing, to avoid instability of foundation pit phenomenon occurs within the scope of cutting depth.
As shown in Figure 1, 2, before above-mentioned recyclable vertical type steel pipe, support construction method of enclosure structure specifically comprises the steps:
1. before excavation of foundation pit, the construction that certain distance carries out Soil-cement Wall 2 is stepped back in foundation ditch sideline, period, for strengthening the shearing resistance of body of wall, bending resistance and resistance capacity to deformation, middle group leader's steel pipe 3 and middle group of short steel pipes 4 are replaced uniform intervals by certain level interval vertical and inserts body of wall inside, simultaneously, the top of group leader's steel pipe 3 and middle group of short steel pipes 4 is reserved certain length and is exposed to outside Soil-cement Wall 2, and row is similarly two rows;
2. by interior group of steel pipe 9 towards excavation of foundation pit direction, be spaced by certain level, obliquely squeeze into (press-in) soil body, until, its bottom connects slip casting steel pipe 10 at the end, hole, forms anchoring body 11, to strengthen the anchored force between steel pipe and the soil body by slip casting;
3. certain distance outside foundation ditch sideline, the collar tie beam 1 that bears down on one of pouring reinforcement concrete structure of namely slotting above Soil-cement Wall 2, the top one of period and middle group leader's steel pipe 3, middle group of short steel pipes 4 and interior group of steel pipe 9 is cast-in-place build fixing, simultaneously at the reserved one group of locating hole 8 of its Outboard Sections;
4. by outer group of steel pipe 5 through locating hole 8 reserved on the collar tie beam 1 that bears down on one, the excavation direction of foundation ditch dorsad, be spaced by certain level, obliquely squeeze into (press-in) soil body, the bottom of outer group of steel pipe 5 connects earth anchor 6, by the fastening effect of earth anchor 6 with deep soil, strengthen resistance to plucking and the anti-slide performance of outer group steel pipe 5; Outer group of steel pipe 5 mainly plays reinforcement AsA-GSH cycle, and strengthen the ability of soil body shearing resistance and resistance to deformation, whole slope stability when guaranteeing that foundation ditch puts slope, its length adopted, level interval, level inclination, row need determine according to foundation soil body character, and meet base pit stability calculation requirement; After construction that it is squeezed into (press-in), top utilizes bolt and cushion block 7 to be locked with the collar tie beam 1 that bears down on one;
5. because said structure is to the enhancing of soil body antiskid, shearing resistance, deformability, foundation ditch can excavate by vertical type fluting, when being excavated to the end, builds reinforced bed 12 in time, and in hole, the soil body carries out putting slope excavation;
6. after foundation construction in foundation ditch, detachable and reclaim above-mentioned steel pipe, to be re-used in next base pit engineering.
As can be seen from the present embodiment, space enclosing structure is supportted before utilizing above-mentioned recyclable vertical type steel pipe, reinforcement, gear soil, sealing effect can be played, constrain soil deformation, strengthen space enclosing structure resistance capacity to deformation, improve its security and stability, solving routine, to put slope excavation method mesoslope larger than excessive, occupied ground face, and other problem that vertical type fender body scale of construction is large, cost is high.Meanwhile, adopt the prefabricated units of recyclable recycling, site assembly speed of application is fast, and readily removablely removes, and possesses environmental protection, economic advantage.
Claims (8)
1. a support space enclosing structure before recyclable vertical type steel pipe, relates to soft soil foundation pit, it is characterized in that described space enclosing structure comprises the collar tie beam that bears down on one, Soil-cement Wall and at least three group steel pipes, described Soil-cement Wall is positioned at centre position and vertically with the described collar tie beam that bears down on one arranges, one end of steel pipe described in three groups is connected and fixed with the described collar tie beam that bears down on one respectively, in steel pipe described in three groups, the group steel pipe being arranged in centre position is vertical with the described collar tie beam that bears down on one to be arranged and is positioned at described Soil-cement Wall inside, other two groups of steel pipes lay respectively in described middle group of steel pipe, outer both sides, and angularly arrange with described middle group of steel pipe, interior group of steel pipe bottom connects slip casting steel pipe and is positioned among the following soil body in the end, hole, anchoring body is formed in its bottom by slip casting, outer group of steel pipe bottom is connected with the earth anchor in the soil body.
2. support space enclosing structure before the recyclable vertical type steel pipe of one according to claim 1, is characterized in that often organizing described steel pipe is at least made up of row's steel pipe.
3. support space enclosing structure before the recyclable vertical type steel pipe of one according to claim 1, is characterized in that described Soil-cement Wall is made up of two row's Double shaft stirring stakes of lap connection, has described middle group of steel pipe in described Soil-cement Wall.
4. support space enclosing structure before the recyclable vertical type steel pipe of the one according to claim 1 or 3, it is characterized in that described middle group of steel pipe comprises two row's steel pipes, often arrange steel pipe and arrange formation by long and short steel pipe alternate intervals.
5. support space enclosing structure before the recyclable vertical type steel pipe of one according to claim 1, it is characterized in that described being connected and fixed is beared down on one on collar tie beam and had at least one group of locating hole described in referring to, in steel pipe described in three groups, outer group of steel pipe stretches in described locating hole corresponding with it, fixed by bolt and backing plate and the described collar tie beam that bears down on one, steel pipe described in all the other two groups and the described collar tie beam that bears down on one are structure as a whole.
6. before relating to a kind of recyclable vertical type steel pipe according to any one of claim 1-5, support the application process of space enclosing structure, it is characterized in that at least comprising the steps: that stepping back a distance in foundation ditch sideline applies described Soil-cement Wall, described middle group of steel pipe is vertically inserted in described Soil-cement Wall inner, and its top certain length is reserved outside described Soil-cement Wall; Go deep into the soil body inside foundation ditch until certain depth bottom foundation ditch by oblique for interior group of steel pipe, by a slip casting steel pipe to described interior group of steel pipe bottom slip casting to form anchoring body, described oblique concrete finger is towards the excavation direction of described foundation ditch; The collar tie beam that bears down on one described in building is integrally formed structure to make the top of described middle group of steel pipe and interior group of steel pipe with it, at least reserves one group of locating hole thereon simultaneously; Bear down on one described in being passed by outer group of steel pipe locating hole on collar tie beam obliquely go deep into the soil body, and its bottom is connected with the earth anchor in the soil body, and its top is fixed by bolt and backing plate and the described collar tie beam that bears down on one, the excavation direction of described oblique concrete finger described foundation ditch dorsad; The soil body inside the described Soil-cement Wall of the upright excavation of fluting, and build reinforced bed in time at the end, hole, in described foundation ditch, the soil body puts slope excavation afterwards.
7. the application process of support space enclosing structure before a kind of recyclable vertical type steel pipe according to claim 6, what it is characterized in that described Soil-cement Wall applies the cutting depth that the degree of depth is greater than described foundation ditch.
8. support the application process of space enclosing structure before a kind of recyclable vertical type steel pipe according to claim 6, it is characterized in that the oblique degree of depth going deep into the soil body of described outer group of steel pipe is greater than the cutting depth of described foundation ditch.
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| CN103882869A (en) * | 2014-03-21 | 2014-06-25 | 郭永 | Inclined supporting pile structure for foundation pit support and construction method thereof |
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| CN105544558A (en) * | 2016-01-08 | 2016-05-04 | 上海岩土工程勘察设计研究院有限公司 | Design method for vertical type foundation pit supporting structure |
| CN105442618B (en) * | 2016-01-08 | 2018-03-16 | 上海岩土工程勘察设计研究院有限公司 | Accessible vertical type foundation pit supporting construction in hole |
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| CN110172966A (en) * | 2019-05-23 | 2019-08-27 | 上海长凯岩土工程有限公司 | A kind of oblique steel pipe composite structure forms the construction method of beaer |
| CN114622573B (en) * | 2022-03-17 | 2023-09-01 | 深圳宏业基岩土科技股份有限公司 | Construction method of reinforced concrete inner support stiffening plate |
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