CN105569051A - Foundation pit support system of sandy pebble boulder geological stratification and construction method - Google Patents
Foundation pit support system of sandy pebble boulder geological stratification and construction method Download PDFInfo
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- CN105569051A CN105569051A CN201511033443.1A CN201511033443A CN105569051A CN 105569051 A CN105569051 A CN 105569051A CN 201511033443 A CN201511033443 A CN 201511033443A CN 105569051 A CN105569051 A CN 105569051A
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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
Abstract
The invention discloses a foundation pit support system of a sandy pebble boulder geological stratification and a construction method. The foundation pit support system comprises two rows of steel pipe piles arranged on two sides of a foundation pit to be dig; each row of steel pipe piles includes multiple steel pipe piles; cement slurry is injected in each steel pipe pile; two crown beams are respectively arranged at the top of each row of steel pipe piles; multiple support pieces are arranged between the two crown beams; and two protection wall layers are positioned on the side wall of the foundation pit. The construction method comprises the steps of drilling, steel pipe pile installation, steel pipe pile grouting, crown beam construction, foundation pit digging, support piece installation and protection wall layer construction. The support system is simple in structure, convenient to operate, economical, practical and particularly suitable for foundation pit support of the sandy pebble boulder geological stratification; and the construction method of the support system is less in destruction of surrounding soil, convenient to operate and high in construction efficiency, effectively guarantees the construction progress, and is lower in cost, economical, practical and particularly suitable for foundation pit support construction of the sandy pebble boulder geological stratification.
Description
Technical field
The present invention relates to a kind of architectural engineering construction technique field, particularly a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system and construction method.
Background technology
Tradition is in sandy gravel erratic boulder geological stratification pattern foundation pit supporting structure generally adopt layering to put method that slope excavation, hand excavated pile, bored pile, steel sheet pile etc. carry out pattern foundation pit supporting structure.
Wherein layering put slope excavation method be: determine to put slope ratio of slope and excavation width according to works work plane to be executed, geological condition, foundation depth etc., machinery is vertical layered, longitudinal divisions excavates, until design substrate, carry out after excavation repairing slope, leveling, and stop reserved soil layer and manually clear up; This construction method is applicable to that the degree of depth is more shallow, geological conditions better and do not affect the spacious construction plant of peripheral structure thing because putting slope.The method of hand excavated pile is: merogenesis carries out manually digging hole, lays retaining wall reinforcing bar after-pouring breast wall concrete, reaches after some strength carry out next circulation construction again, until absolute altitude at the bottom of design stake until breast wall concrete; The method be applicable to the degree of depth compared with shallow, influence on groundwater is little, the good mountain area of geological condition and special construction place, but the method security risk is high, applies less at present in municipal construction.Bored pile construction method adopts boring machine drilling and forming hole, transfers reinforcing cage concrete perfusion pile after pore-forming; This construction method is applicable to deep foundation ditch protection, but needs enough construction plants, and the phenomenon such as collapse hole, spillage very easily occurs for chance erratic boulder, sand-pebble layer, pore-forming difficulty, and construction cost is higher.The method of steel sheet pile is: adopt piling machinery in the soil body, to squeeze into steel sheet pile successively, then excavation limit in limit arranges inner support system.This construction method is applicable to the protection of soft foundation foundation ditch, cannot pile when chance sandy gravel and erratic boulder layer.
Therefore, Mu Qian Han treats a kind of city foundation pit supporting system being applicable to sandy gravel erratic boulder geological stratification, and when running into sandy gravel erratic boulder geological stratification, builds the construction method of foundation pit supporting system.
Summary of the invention
The object of the invention is to overcome in prior art and adopt layering to put slope excavation, hand excavated pile, bored pile, steel sheet pile etc. when carrying out pattern foundation pit supporting structure, the above-mentioned deficiency that foundation pit support construction cost is high, performance difficulty, security risk are high, a kind of foundation pit supporting system being applicable to sandy gravel erratic boulder geological stratification is provided, and when running into sandy gravel erratic boulder geological stratification, build the construction method of this foundation pit supporting system.
In order to realize foregoing invention object, the invention provides following technical scheme:
A kind of sandy gravel erratic boulder geological stratification foundation pit supporting system, comprising:
Two row's steel pipe piles, are separately positioned on the both sides of foundation ditch to be dug, and often arrange steel pipe pile and comprise several steel pipe piles, be marked with cement paste in each described steel pipe pile;
Two Guan Liang, are separately positioned on and often arrange described steel pipe pile top, and each described Guan Liang is used for the described steel pipe pile top of a corresponding row to link together;
Several support members, are located between two described hat beams respectively;
And two retaining wall layers, be located at the foundation pit side-wall being positioned at and often arranging described steel pipe pile place respectively.
A kind of sandy gravel erratic boulder geological stratification foundation pit supporting system of the present invention have employed two row's steel pipe piles, two row's steel pipe piles are equipped with Guan Liang, and several support members are set between Guan Liang, also retaining wall layer is set at foundation pit side-wall simultaneously, effectively can strengthen the stability of the soil body, ensure the supporting safety of foundation ditch, destroy very little to surrounding soil, this support system structure is simple, easy to operate, economical and practical, is particularly useful for the pattern foundation pit supporting structure of sandy gravel erratic boulder geological stratification.
Preferably, the basal surface of the relative foundation ditch in each described steel pipe pile bottom also gos deep into the soil body at least 3m, and steel pipe pile surrounding is established and quincunxly oozed slurry hole, contributes to reducing the stressed probability bent of steel pipe pile under the effect of the foundation ditch periphery soil body, increases the stability of steel pipe pile.
Preferably, it is equal often to arrange described steel pipe pile spacing, ensures often to arrange each position support strength of steel pipe pile to the soil body identical.
Preferably, each described support member is i iron.
Preferably, described retaining wall layer is concrete guard wall layer, and in be provided with reinforced mesh, strengthen bonding strength and the support strength of retaining wall layer.
Present invention also offers the construction method of a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system described above, comprise the following steps:
Step one, boring, carry out drilling two campshed holes on the both sides in foundation ditch region to be dug, the pore size of described stake holes and the degree of depth respectively with described steel pipe pile diameter and length adaptation;
Step 2, installation steel pipe pile, install steel pipe pile in each described stake holes, completes the installation of the described steel pipe pile of two rows on foundation ditch both sides;
Step 3, steel tube pile grouting, carry out slip casing by pressure to each described steel pipe pile, and cement paste reinforces pile peripheral earth by steel pipe pile sidewall plum blossom hole, and fills up the endoporus of steel pipe pile;
Step 4, Guan Liang construct, and build shaping steel concrete Guan Liang often arranging between described steel pipe pile top;
Step 5, excavation of foundation pit, first excavates 1.5m ~ 2.0m degree of depth, prepares to install support member;
Step 6, installation support member, install several support members between two described hat beams;
Step 7, retaining wall layer are constructed, and in the process of stage excavation foundation ditch, described retaining wall layer that two sidewalls are constructed, until complete the construction of foundation pit supporting system.
The construction method of this sandy gravel erratic boulder geological stratification foundation pit supporting system, hole, steel pipe pile install and steel tube pile grouting time, less to surrounding soil vibration, ensure that the stability of the foundation ditch periphery soil body, carry out the construction of Guan Liang, excavation of foundation pit, support member and retaining wall layer again, finally complete foundation pit supporting system, destroy very little to surrounding soil, easy to operate, efficiency of construction is high, effectively ensure that construction speed, cost is lower, economical and practical, is particularly useful for the foundation pit support construction of sandy gravel erratic boulder geological stratification.
Preferably, in described step 3 during steel tube pile grouting, adopt at least once grouting, each slip casting all adopts the grouting mode from steel pipe pile top to bottom direction, i.e. described grouting pipe and steel pipe pile top ferrule, inside slip casing by pressure, cement paste reinforces pile peripheral earth by steel pipe pile sidewall plum blossom hole, and fills up steel pipe pile endoporus.
Preferably, it is characterized in that, construct in described step 7 retaining wall layer time, first on foundation pit side-wall, lay reinforced mesh, then relatively described for concrete foundation ditch mode is from top to bottom injected on described foundation pit side-wall, and covers described reinforced mesh, form the retaining wall layer that thickness is at least 80mm.
Preferably, it is characterized in that, in described step 5, excavation of foundation pit adopts and carries out in a hierarchical fashion at vertical direction, when completing foundation depth and being no more than 2m, carry out the installation of the support member in described step 6, contribute to strengthening steel pipe pile to the support strength of the foundation ditch periphery soil body, avoid foundation pit side-wall cave in when subsequent construction or destroy, ensure carrying out smoothly of next step excavation of foundation ditch.
Preferably, it is characterized in that, in described step 5, excavation of foundation pit adopts and carries out in a hierarchical fashion at vertical direction, after completing the foundation ditch of every layer, the sidewall of foundation ditch is carried out to the retaining wall layer construction in described step 7, construct and maintenance after 24 hours at described retaining wall layer, carry out lower one deck excavation of foundation pit and the construction of retaining wall layer again, until complete foundation ditch and the construction of retaining wall layer of desired depth, contribute to the bonding strength strengthening retaining wall layer and foundation pit side-wall, strengthen the firm effect of whole foundation pit supporting system.
Compared with prior art, beneficial effect of the present invention:
1, a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system of the present invention, have employed two row's steel pipe piles, two row's steel pipe piles are equipped with Guan Liang, and several support members are set between Guan Liang, also retaining wall layer is set at foundation pit side-wall simultaneously, effectively can strengthens the stability of the soil body, ensure the supporting safety of foundation ditch, destroy very little to surrounding soil, this support system structure is simple, easy to operate, economical and practical, is particularly useful for the pattern foundation pit supporting structure of sandy gravel erratic boulder geological stratification;
2, a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system of the present invention and construction method, the basal surface of the relative foundation ditch in each steel pipe pile bottom also gos deep into the soil body at least 3m, and need be verified by computational check of stress, contribute to reducing the stressed probability bent of steel pipe pile under the effect of the foundation ditch periphery soil body, increase the stability of steel pipe pile;
3, the construction method of a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system of the present invention, hole, steel pipe pile install and steel tube pile grouting time, less to surrounding soil vibration, ensure that the stability of the foundation ditch periphery soil body, carry out the construction of Guan Liang, excavation of foundation pit, support member and retaining wall layer again, finally complete foundation pit supporting system, destroy very little to surrounding soil, easy to operate, efficiency of construction is high, effectively ensure that construction speed, cost is lower, economical and practical, is particularly useful for the foundation pit support construction of sandy gravel erratic boulder geological stratification;
4, the construction method of a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system of the present invention, adopt when excavation of foundation pit and carry out in a hierarchical fashion at vertical direction, when completing foundation depth and being 1.5 ~ 2m, just carry out the installation of support member, contribute to strengthening steel pipe pile to the support strength of the foundation ditch periphery soil body, avoid foundation pit side-wall cave in when subsequent construction or destroy, ensure carrying out smoothly of next step excavation of foundation ditch.
Accompanying drawing illustrates:
Fig. 1 is the sectional view of the relative soil body of a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system of the present invention;
Fig. 2 is a kind of described in Fig. 1 top view of sandy gravel erratic boulder geological stratification foundation pit supporting system;
Fig. 3 is the partial isometric of the relative soil body of a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system described in Fig. 1.
Mark in figure:
1, steel pipe pile, 2, Guan Liang, 3, retaining wall layer, 4, support member, 5, foundation ditch, 6, basal surface, 7, the soil body.
Detailed description of the invention
Below in conjunction with test example and detailed description of the invention, the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on content of the present invention all belong to scope of the present invention.
Embodiment 1
As Figure 1-3, a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system, comprising:
Two row's steel pipe piles 1, are separately positioned on the both sides of foundation ditch 5 to be dug, and often arrange steel pipe pile 1 and comprise several steel pipe piles 1, be marked with cement paste in each described steel pipe pile 1;
Two hat beams 2, are separately positioned on and often arrange described steel pipe pile 1 top, and each described hat beam 2 is for linking together described steel pipe pile 1 top of a corresponding row;
Several support members 4, are located between two described hat beams 2 respectively;
And two retaining wall layers 3, be located at foundation ditch 5 sidewall being positioned at and often arranging described steel pipe pile 1 place respectively.
The basal surface 6 of the above-mentioned relative foundation ditch 5 in each steel pipe pile 1 bottom also gos deep into the soil body 7 at least 3m, and need be verified by computational check of stress, and steel pipe pile 1 surrounding establishes quincunx oozing to starch hole; As shown in Figure 3, contribute to reducing the foundation ditch 5 periphery soil body 7 and act on the lower stressed probability bent of steel pipe pile 1, increase the stability of steel pipe pile 1.In addition, it is equal often to arrange described steel pipe pile 1 interval, and ensure that each position support strength often arranging steel pipe pile 1 pair of soil body 7 is identical, this spacing of often arranging between steel pipe pile 1 adopts 50cm usually, and need be verified by computational check of stress.Each support member 4 is adopted as i iron, is fixed on hat beam 2 bottom i iron two ends by bracket.Retaining wall layer 3 is sprayed mortar retaining wall layer 3 in addition, and in be provided with reinforced mesh, strengthen bonding strength and the support strength of retaining wall layer 3.
A kind of sandy gravel erratic boulder geological stratification foundation ditch 5 support system of the present invention have employed two row's steel pipe piles 1, two row's steel pipe piles 1 are equipped with hat beam 2, and several support members 4 are set between hat beam 2, also retaining wall layer 3 is set at foundation ditch 5 sidewall simultaneously, effectively can strengthen the stability of the soil body 7, ensure the supporting safety of foundation ditch 5, surrounding soil 7 is destroyed very little, this support system structure is simple, easy to operate, economical and practical, is particularly useful for foundation ditch 5 supporting of sandy gravel erratic boulder geological stratification.
Embodiment 2
Present invention also offers the construction method as a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system, as Figure 1-3, comprise the following steps:
Step one, boring, carry out drilling two campshed holes on the both sides in foundation ditch 5 region to be dug, according to the position, hole of surveying and locating, YBL-868 sleeve pipe (i.e. water drilling) rig pore-forming can be adopted, as required, in order to ensure the size of steel pipe pile 1 stake holes, verticality and the degree of depth after pore-forming, this depth of pore forming is determined by calculating, with steel pipe pile 1 size fit; Such as adopt φ 108mm steel pipe time, drilling aperture is φ 135mm, and pitch-row arranges identical with the spacing of steel pipe pile 1, as 2 meters arrange 5 time, pitch-row employing 500mm spacing;
Step 2, installation steel pipe pile 1, install steel pipe pile 1 in each described stake holes, completes the installation of the described steel pipe pile 1 of two rows on foundation ditch 5 both sides; Install steel pipe in time after pore-forming and extract rig sleeve pipe, form steel pipe pile 1, insert Kong Zhongqian at steel pipe pile 1, should take to arrange the measure such as locating piece or spacer bars and make steel pipe be in the centre of boring, the structure of location measure should not hinder slurries during slip casting to flow freely; Due to diameter of steel tube φ 108mm, below steel pipe 1.0m every 300mm φ l0mm fluted drill along steel pipe surrounding by the quincunx hole getting out diameter phi 10mm, as ooze slurry hole;
Step 3, steel pipe pile 1 slip casing by pressure, carry out slip casing by pressure to each described steel pipe pile 1, and cement paste reinforces pile peripheral earth by steel pipe pile 1 sidewall plum blossom hole, and fills up steel pipe pile 1 endoporus;
Step 4, hat beam 2 are constructed, and to build shaping steel concrete hat beam 2 often arranging between described steel pipe pile 1 top; Establish C35 steel concrete to be preced with beam 2 at steel pipe pile 1 top, hat beam 2 size and arrangement of reinforcement should be determined according to actual conditions, and size adopts 300mm (wide) × 300mm (height) usually;
Step 5, foundation ditch 5 excavates, and first excavates 1.5m ~ 2.0m degree of depth, prepares to install support member 4;
Step 6, installation support member 4, between two described hat beams 2, install several support members 4, this bracing members adopts 25b i iron, level interval 1.5-2m, and bracing members adopts and is fixed at its two ends lower weld bracket and hat beam 2;
Step 7, installation retaining wall layer 3, in the process of stage excavation foundation ditch 5, foundation ditch 5 every layer of cutting depth is 1.5m ~ 2.0m, foundation ditch 5 two sidewalls installs described retaining wall layer 3, until complete the construction of foundation ditch 5 support system.
Wherein in above-mentioned steps three during steel pipe pile 1 slip casting, adopt at least once grouting, each slip casting all adopts the grouting mode from steel pipe pile 1 top to bottom direction, i.e. described grouting pipe and steel pipe pile 1 top ferrule, inside slip casing by pressure cement paste reinforces pile peripheral earth 7 by steel pipe pile 1 sidewall plum blossom hole, and fills up steel pipe pile 1 endoporus.Such as steel pipe is inserted Kong Zhonghou, carry out slip casting filling perforation at twice; Grouting pressure is 0.4 ~ 1Mpa for the first time, and according to the long maintenance of the stake corresponding time, adopts top grouting mode during slip casting; Second time grouting pressure is not less than 0.5Mpa, and twice slip casting is no less than 1.5h and is not more than 4h interval time.Cement paste adopts special-purpose machinery to carry out mixing, and cement is adopted as P.O42.5 Portland cement, and water/binder ratio controls 0.45 ~ 0.5.
When retaining wall layer 3 is installed in above-mentioned steps seven, first on foundation ditch 5 sidewall, lays reinforced mesh, then relative for concrete foundation ditch 5 mode is from top to bottom injected on foundation ditch 5 sidewall, and covers reinforced mesh, form topping.Concrete, in order to ensure slope leveling and without after loosened soil, side slope is laid φ 6.5mm, cell length and width are respectively the reinforced mesh of 250mm × 250mm, and the C20 pea gravel concreten retaining wall utilizing 100mm thick is injected on foundation ditch 5 sidewall; Spray pea gravel concreten time, shower nozzle be preferably 0.6 ~ 1.2m by spray plane distance, vertical domatic injection from bottom to top, one time jet thickness is preferably 40mm; After injection completes, reinforced mesh protective layer thickness should not be less than 80mm; Strictly successively construct by construction sequence, forbid next step earthwork of digging between surface layer curing time, surface layer maintenance can carry out lower step soil excavation after 24 hours.
In above-mentioned steps five, foundation ditch 5 excavates to adopt and carries out in a hierarchical fashion at vertical direction, hand fit's machinery can be adopted to carry out foundation ditch 5 in the mode of being divided into excavate, when completing foundation ditch 5 degree of depth and being no more than 2m (namely calculate the degree of depth top down from hat beam 2 and be not more than 2m), carry out the installation of the support member 4 in step 6, contribute to the support strength strengthening steel pipe pile 1 pair of foundation ditch 5 periphery soil body 7, avoid foundation ditch 5 sidewall cave in when subsequent construction or destroy, ensure carrying out smoothly of next step excavation of foundation ditch 5.
In above-mentioned steps five, foundation ditch 5 excavates to adopt and carries out in a hierarchical fashion at vertical direction, after completing the foundation ditch 5 of every layer, the retaining wall layer 3 that the sidewall of foundation ditch 5 carries out in described step 7 is constructed, construct and maintenance after 24 hours at retaining wall layer 3, carry out lower one deck foundation ditch 5 again to excavate and retaining wall layer 3 is constructed, until complete the foundation ditch 5 of desired depth and retaining wall layer 3 is constructed.
In order to ensure foundation ditch 5 support system construction quality, after step 3 completes steel pipe pile 1 slip casting, also comprise quality control and inspection step, namely examination steel tube stake 1 deviation must not be greater than 50 ㎜, and the stake footpath deviation of steel pipe pile 1 must not be greater than 4%, and verticality is no more than 1%.Long to cement consumption, stake in work progress, stake footpath, slip casting, pressure etc. carry out conservative control.
The construction method of this sandy gravel erratic boulder geological stratification foundation ditch 5 support system, hole, steel pipe pile 1 install and steel pipe pile 1 slip casting time, vibrate less to surrounding soil 7, ensure that the stability of the foundation ditch 5 periphery soil body 7, construct at hat beam 2, carry out foundation ditch 5 and excavate, support member 4 and retaining wall layer 3 are installed, finally complete the construction of foundation ditch 5 support system, surrounding soil 7 is destroyed very little, easy to operate, efficiency of construction is high, effectively ensure that construction speed, cost is lower, economical and practical, is particularly useful for foundation ditch 5 supporting construction of sandy gravel erratic boulder geological stratification.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a sandy gravel erratic boulder geological stratification foundation pit supporting system, is characterized in that, comprising:
Two rows' steel pipe pile (1), are separately positioned on the both sides of foundation ditch to be dug (5), often arrange steel pipe pile (1) and comprise several steel pipe piles (1), be marked with cement paste in each described steel pipe pile (1);
Two Guan Liang (2), are separately positioned on and often arrange described steel pipe pile (1) top, and each described Guan Liang (2) is for linking together described steel pipe pile (1) top of a corresponding row;
Several support members (4), are located between two described Guan Liang (2) respectively;
And two retaining wall layers (3), be located at foundation ditch (5) sidewall being positioned at and often arranging described steel pipe pile (1) place respectively.
2. a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system according to claim 1, it is characterized in that, the basal surface (6) of the relative foundation ditch in each described steel pipe pile (1) bottom (5) also gos deep into the soil body (7) at least 3m, and steel pipe pile (1) surrounding establishes quincunx oozing to starch hole.
3. a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system according to claim 1, is characterized in that, it is equal often to arrange described steel pipe pile (1) spacing.
4. a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system according to claim 1, it is characterized in that, each described support member (4) is i iron.
5., according to the arbitrary described a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system of claim 1-4, it is characterized in that, described retaining wall layer (3) is concrete guard wall layer (3), and in be provided with reinforced mesh.
6. a construction method for a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system as described in as arbitrary in claim 1-5, is characterized in that, comprise the following steps:
Step one, boring, carry out drilling two campshed holes on the both sides in foundation ditch to be dug (5) region, the pore size of described stake holes and the degree of depth respectively with described steel pipe pile (1) diameter and length adaptation;
Step 2, installation steel pipe pile (1), install steel pipe pile (1) in each described stake holes, completes the installation of the two described steel pipe pile of the rows (1) on foundation ditch (5) both sides;
Step 3, steel pipe pile (1) slip casting, carry out slip casing by pressure to each described steel pipe pile (1), and cement paste by steel pipe pile (1) sidewall plum blossom hole reinforcing pile peripheral earth, and fills up the endoporus of each described steel pipe pile (1);
Step 4, Guan Liang (2) construct, and build shaping steel concrete Guan Liang (2) often arranging between described steel pipe pile (1) top;
Step 5, foundation ditch (5) excavates, and first excavates the degree of depth of 1.5m ~ 2.0m, prepares to install support member (4);
Step 6, installation support member (4), install several support members (4) between two described Guan Liang (2);
Step 7, retaining wall layer (3) are constructed, and in the process of stage excavation foundation ditch (5), described retaining wall layer (3) that two sidewalls are constructed, until complete the construction of foundation ditch (5) support system.
7. the construction method of a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system according to claim 6, it is characterized in that, in described step 3 during steel pipe pile (1) slip casting, adopt at least once grouting, each slip casting all adopts the grouting mode from steel pipe pile (1) top to bottom direction, i.e. described grouting pipe and steel pipe pile (1) top ferrule, inside slip casing by pressure, cement paste reinforces pile peripheral earth by steel pipe pile (1) sidewall plum blossom hole, and fills up the endoporus of each described steel pipe pile (1).
8. the construction method of a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system according to claim 6, it is characterized in that, construct in described step 7 retaining wall layer (3) time, first on foundation ditch (5) sidewall, lay reinforced mesh, then relatively described for concrete foundation ditch (5) layering mode is from top to bottom injected on described foundation ditch (5) sidewall, and cover described reinforced mesh, form the retaining wall layer that thickness is at least 80mm.
9. the construction method of a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system according to claim 6, it is characterized in that, in described step 5, foundation ditch (5) excavation adopts and carries out in a hierarchical fashion at vertical direction, when completing foundation ditch (5) cutting depth 1.5m ~ 2m, carry out the installation of the support member (4) in described step 6.
10. according to the construction method of the arbitrary described a kind of sandy gravel erratic boulder geological stratification foundation pit supporting system of claim 6-9, it is characterized in that, in described step 5, foundation ditch (5) excavation adopts and carries out in a hierarchical fashion at vertical direction, after the excavation completing foundation ditch (5) every layer, the sidewall of foundation ditch (5) is carried out to retaining wall layer (3) construction in described step 7, in the maintenance of described retaining wall layer (3) after 24 hours, carry out lower one deck foundation ditch (5) excavation and retaining wall layer (3) construction again, until complete foundation ditch (5) and retaining wall layer (3) construction of desired depth.
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| CN106245655A (en) * | 2016-07-26 | 2016-12-21 | 中交第航务工程局有限公司 | Utilize the deep foundation pit supporting construction method of miniature steel pipe pile |
| CN108824449A (en) * | 2018-07-26 | 2018-11-16 | 中国建筑第八工程局有限公司 | Support system and its construction method with underground horizontal support |
| CN109371985A (en) * | 2018-05-28 | 2019-02-22 | 中南大学 | A kind of foundation pit supporting method for recent fill |
| CN109403332A (en) * | 2018-09-25 | 2019-03-01 | 中建五局土木工程有限公司 | The wide shallow river valley deep basal pit layering bench of sandy gravel thick-covering combines excavation method |
| CN111485549A (en) * | 2020-04-30 | 2020-08-04 | 广西路建工程集团有限公司 | Rotary drilling and buried drilling treatment method |
| CN112854237A (en) * | 2021-01-07 | 2021-05-28 | 青岛理工大学 | Construction method for steel sheet pile support in case of boulder |
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