CN204252148U - High artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure - Google Patents
High artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure Download PDFInfo
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- CN204252148U CN204252148U CN201420737294.1U CN201420737294U CN204252148U CN 204252148 U CN204252148 U CN 204252148U CN 201420737294 U CN201420737294 U CN 201420737294U CN 204252148 U CN204252148 U CN 204252148U
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Abstract
The utility model discloses high artesian thick sand-pebble layer deep foundation ditch slip casting back cover slip casting structure and construction technology thereof, comprise the water-stop curtain inserting underground, slurry base plate, slurry side wall and slurry partition wall is formed with by slip casting in the below of water-stop curtain, described slurry side wall and water-stop curtain closely cementing, slurry base plate, slurry side wall and slurry partition wall are enclosed in substrate and form multiple U-shaped slip casting storehouse to lower recess, and above slurry base plate, secondary grouting is formed with slurry strengthening course.The utility model U-shaped slip casting chamber structure increases hole end bulk strength and rigidity, possess the reinforcing of the end, hole and antiseepage double effects, the bottom heave that the high artesian that effectively can solve buried depth increasing causes hole end stability influence and excavation of foundation pit, reduces the sedimentation and deformation of hole wall lateral displacement and surrounding environment simultaneously preferably.
Description
Technical field
The utility model relates to the artesian water process field of thick sand-pebble layer deep-foundation pit engineering, specifically refers to high artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure.
Background technology
At present, the outer precipitation in hole, curtain vertical partition wall, the full slip casting back cover of substrate three kinds of methods are usually adopted to solve the engineering problem that artesian water causes in deep-foundation pit engineering.
The first is the outer precipitation method in hole, the mentality of designing of the method is: adopt diaphragm wall or drilled pile, interlocking pile and corresponding water-stop curtain etc. as space enclosing structure, first carry out cheating the construction of inside and outside dewatering confined water after space enclosing structure is carried out, drop to the absolute altitude of designing requirement at artesian water head after, carry out excavation.The advantage of the method is, constructs more convenient, and construction quality can ensure.The shortcoming of the method is, precipitation unavoidably causes the sedimentation of foundation ditch surrounding enviroment and relative settlement, especially the very deficient regional engineering of water resource and the engineering higher to sedimentation and deformation requirement, and the program is forbidden to adopt; At the sand-pebble layer that artesian head is higher, the water content of artesian aquifer is enriched, Rainfall Influence scope is wide, pump-out is large, the time of dewatering confined water is long, and precipitation expense and difficulty are very high, higher to the power demands at execution control, municipal drainage and scene, during power-off, emergency plan enforcement difficulty is high, and in hole, dewatering well is closed also suitable risk.
The second is curtain vertical partition wall method, the mentality of designing of the method is: adopt diaphragm wall or drilled pile, interlocking pile and corresponding water-stop curtain as space enclosing structure, water-stop curtain inserts the impervious layer certain depth under artesian aquifer, reaches vertical partition wall artesian water object.The advantage of the method is, the excavation of foundation pit stage does not need dewatering confined water, construction risk and relatively little on the impact of surrounding environment; Construction quality can ensure.The shortcoming of the method is, the degree of depth of water-stop curtain is large, and particularly when artesian aquifer is thicker and buried depth is darker, water-stop curtain inserts deep layer impervious layer, very high to the requirement of construction technology and construction machinery.Water-stop curtain is darker, is more difficult to ensure verticality and the leak tightness of card water-stop curtain, once there is the situation that curtain leaks in digging process, prominent gushing very easily occurs, and consequence is serious, and is difficult to judge breakthrough.
The third is substrate gamut slip casting back cover method, the mentality of designing of the method is: adopt diaphragm wall or drilled pile, interlocking pile and corresponding water-stop curtain as space enclosing structure, substrate adopts gamut slip casting water proof, utilizes injecting cement paste to conduct oneself with dignity and resists artesian pressure.The advantage of the method is, the excavation of foundation pit stage does not need dewatering confined water, construction risk and relatively little on the impact of surrounding environment; Construction quality can ensure.The shortcoming of the method is, grouting amount is very large, and particularly when artesian aquifer is thicker and buried depth is darker, slip casting appropriate litigation fees is high.Injecting cement paste is once there be local quality problem, and leaking appears in substrate, and underground water is rushed to rock-soil layer in substrate, and be difficult to judge leakage area after string water, be also difficult to carry out the process of specific aim compensation and grouting, gamut compensation and grouting is then costly, and the duration is slow.
Utility model content
The purpose of this utility model is to provide high artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure, solve the grouting amount that in prior art, substrate gamut slip casting back cover method exists large, costly, long in time limit, leaking appears in substrate, underground water is rushed to rock-soil layer in substrate, is difficult to the problem judging leakage area after string water.
High artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure, comprise the water-stop curtain inserting underground, slurry base plate, slurry side wall and slurry partition wall is formed with by slip casting in the below of water-stop curtain, described slurry side wall and water-stop curtain closely cementing, slurry base plate, slurry side wall and slurry partition wall are enclosed in substrate and form multiple U-shaped slip casting storehouse to lower recess, and above slurry base plate, secondary grouting is formed with slurry strengthening course.The utility model adopts existing equipment in deep foundation pit construction, creatively propose the U-shaped point storehouse slip casting back cover structure of U-shaped, the slurry base plate that slip casting is formed, slurry side wall, slurry partition wall encloses the U-shaped slip casting storehouse back cover structure forming bottom lock, entirely descending in foundation pit construction process, because substrate is divided into several U-shaped slip casting storehouse back cover structures be separated from each other successively, when occurring in certain U-shaped slip casting storehouse that water level raises suddenly or water yield situation jumpy, then can judge to occur leakage point in this U-shaped slip casting storehouse, only need carry out pump drainage to this slip casting storehouse and mend injecting treatment.With technical scheme the most close be substrate gamut slip casting back cover scheme, this scheme grouting amount is very large, and particularly when artesian aquifer is thicker and buried depth is darker, slip casting appropriate litigation fees is high.Injecting cement paste is once there be local quality problem, and leaking appears in substrate, and underground water is rushed to rock-soil layer in substrate, and be difficult to judge leakage area after string water, be also difficult to carry out the process of specific aim compensation and grouting, gamut compensation and grouting is then costly, and the duration is slow; And the technical scheme of the application just can overcome substrate gamut slip casting back cover scheme Problems existing, once find local infiltration, can prominent gush occur before Timeliness coverage seepage place, and have enough buffer time to carry out the stronger compensation and grouting process of specific aim, not only reduce overall cost, and utilize Rock And Soil deadweight opposing artesian pressure, compare the full slip casting back cover of substrate, grouting amount significantly reduces, and greatly reduces engineering cost and duration; Slurry side wall and slurry partition wall is formed by slip casting, substrate is separated into multiple U-shaped slip casting storehouse, dewatering well and water-level observation hole are set in each slip casting storehouse, once certain storehouse water-level observation hole water level or the water yield sharply change, injecting treatment can be compensated in time for this storehouse in time, carry out backfill back-pressure if desired, also there is certain water storage space in storehouse, reserve buffer time to emergency processing, in addition, point storehouse compensation and grouting can the specific aim of safeguard measure, also reduces disposal cost and duration; U-shaped slip casting chamber structure increases hole end bulk strength and rigidity, possess the reinforcing of the end, hole and antiseepage double effects, the bottom heave that the high artesian that effectively can solve buried depth increasing causes hole end stability influence and excavation of foundation pit, reduces the sedimentation and deformation of hole wall lateral displacement and surrounding environment simultaneously preferably.
Slurry base plate, the slurry side wall in described U-shaped slip casting storehouse are formed by mini-valve tube note dual slurry.
Described U-shaped slip casting storehouse, slurry partition wall and slurry strengthening course note single liquid slurry by mini-valve tube and formed.Further, in the technical scheme of the application, sleeve valve barrel grouting warehouse first adopts the dual slurry that gel time is short, consolidation strength is high, injecting cement paste is formed rapidly for water proof on high artesian stratum, namely slurry base plate and slurry side wall is utilized to carry out water proof, then cheap, that technique is simple, anti-permeability performance good, set strength is high single liquid slurry is adopted to carry out reinforcement, consolidate slip casting effect further, both ensure that the requirement of substrate slip casting back cover, there is again stronger economy.
In each U-shaped slip casting storehouse, water-level observation hole and dewatering well are all set.When water level or the water yield sharply change in storehouse, can be used for pump drainage and the process of mini-valve tube compensation and grouting in storehouse.
The construction technology of high artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure, comprises the following steps:
A (), according to artesian water water pressure and the excavation of foundation pit degree of depth, determines the degree of depth, slurry base plate thickness, slurry side wall thicknesses, slurry side wall and the superimposed degree of depth of curtain bottom the curtain degree of depth, substrate U-shaped slip casting storehouse;
(b) construction space enclosing structure: utilize diaphragm wall, interlocking pile or drilled pile to form corresponding water-stop curtain;
C () adopts the grouting of sleeve valve barrel grouting technique to build the grouting back cover structure being formed and have multiple U-shaped slip casting storehouse on ground, and be built up integrally closed structure with water-stop curtain;
D () applies dewatering well and water-level observation hole in hole, by underground water drainage in storehouse;
E () layer and section excavates from the top down, and set up inner support in time, until be excavated to substrate;
F () to be returned along way by open cut and is built agent structure, sequentially remove inner support, and top board backfills.
In construction technology of the present utility model, to form the U-lag of slip casting structure in underground by controlling the slip casting degree of depth of mini-valve tube, grouting amount and injection speed, thus the subregion realizing subterranean layer controls, for substrate of the prior art full slip casting back cover scheme, duration shortens, and the risk of infiltration reduces greatly, and permeable specified place is convenient to excavate and control, be convenient to find permeable point in time, greatly reduce the risk that foundation ditch is permeable.
Described step (c) comprises the following steps:
(c1) first adopt sleeve valve barrel grouting engineering method note dual slurry, form slurry base plate and slurry side wall, the bottom of slurry side wall and water-stop curtain is closely connected, and slurry base plate, slurry side wall and water-stop curtain form substrate U-shaped slip casting storehouse back cover structure jointly;
(c2) then adopt sleeve valve barrel grouting engineering method to note single liquid slurry, form slurry partition wall, U-shaped slip casting storehouse is separated into multiple U-shaped slip casting storehouse;
(c3) finally adopt sleeve valve barrel grouting engineering method to note single liquid slurry, above slurry base plate, carry out secondary grouting, form slurry strengthening course.
Further, in the technical scheme of the application, sleeve valve barrel grouting warehouse first adopts the dual slurry that gel time is short, consolidation strength is high, injecting cement paste is formed rapidly for water proof on high artesian stratum, namely slurry base plate and slurry side wall is utilized to carry out water proof, then cheap, that technique is simple, anti-permeability performance good, set strength is high single liquid slurry is adopted to carry out reinforcement, consolidate slip casting effect further, both ensure that the requirement of substrate slip casting back cover, there is again stronger economy.
The utility model compared with prior art, has following advantage and beneficial effect:
1, the utility model high artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure, slurry partition wall is formed by slip casting, U-shaped for substrate slip casting storehouse is separated into multiple slip casting storehouse, each slip casting storehouse arranges dewatering well and water-level observation hole, once certain storehouse water-level observation hole water level or the water yield sharply change, injecting treatment can be compensated in time in time for this storehouse, carry out backfill back-pressure if desired, also certain water storage space is had in storehouse, buffer time is reserved to emergency processing, in addition, point storehouse compensation and grouting can the specific aim of safeguard measure, also reduces disposal cost and duration; U-shaped slip casting chamber structure increases hole end bulk strength and rigidity, possess the reinforcing of the end, hole and antiseepage double effects, the bottom heave that the high artesian that effectively can solve buried depth increasing causes hole end stability influence and excavation of foundation pit, reduces the sedimentation and deformation of hole wall lateral displacement and surrounding environment simultaneously preferably;
2, the utility model high artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure, first adopt the dual slurry that gel time is short, consolidation strength is high, injecting cement paste is formed rapidly for water proof on high artesian stratum, namely slurry base plate and slurry side wall is utilized to carry out water proof, then cheap, that technique is simple, anti-permeability performance good, set strength is high single liquid slurry is adopted to carry out reinforcement, consolidate slip casting effect further, both ensure that the requirement of substrate slip casting back cover, there is again stronger economy;
3, the utility model high artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure, slurry side wall and the water-stop curtain of slip casting formation are closely cementing, prevent slip casting warehouse and water-stop curtain joint place from seepage erosion occurring, also make up the leakage problems do not closed because of construction reason curtain.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide the further understanding to the utility model embodiment, forms a application's part, does not form the restriction to the utility model embodiment.In the accompanying drawings:
Fig. 1 is the U-shaped slip casting storehouse schematic cross section of the utility model foundation ditch;
Fig. 2 is vertical section, the U-shaped slip casting storehouse schematic diagram of the utility model foundation ditch;
Fig. 3 is the top view in the U-shaped slip casting storehouse of the utility model foundation ditch;
Fig. 4 is the structural representation according to substrate gamut slip casting back cover in embodiment;
Fig. 5 is the constructing structure schematic diagram according to the utility model structure in embodiment.
Mark and corresponding component title in accompanying drawing:
1-water-stop curtain, 2-base plate, 3-side wall, 4-partition wall, 5-strengthening course, 6-inner support, 7-agent structure, 8-actual water level.
Detailed description of the invention
Clearly understand for making the purpose of this utility model, technical scheme and advantage, below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, exemplary embodiment of the present utility model and explanation thereof are only for explaining the utility model, and conduct is not to restriction of the present utility model.
Embodiment
The present embodiment is Beijing Metro station, and its length is 139.2m, and standard paragraphs foundation depth is 31.6m, width 24.9m.Station base plate is mainly positioned at the very strong boulder bed of water permeability, cheats outer pressure water head distance hole end 13m.
Conventionally middle substrate gamut slip casting back cover scheme: space enclosing structure adopts the thick diaphragm wall of 1.0m, building-in depth 15m, substrate 15m scope adopts the full hall slip casting of mini-valve tube, its at the middle and upper levels 12m scope note single liquid slurry, lower floor 3m scope note dual slurry, as shown in Figure 4.Through estimation, space enclosing structure cost about 6,229 ten thousand, slip casting expense 11,280 ten thousand, 3 months slip casting durations.
And in the work progress of reality, its constructing structure as shown in Figures 1 to 3,
A (), according to artesian water water pressure and the excavation of foundation pit degree of depth, determines the degree of depth 15 meters bottom water-stop curtain 1 degree of depth 9 meters, substrate U-shaped slip casting storehouse, slurry base plate 2 thickness 3 meters, slurry side wall 3 thickness 2 meters, slurry side wall 4 and the superimposed degree of depth of water-stop curtain 19 meters;
(b) construction space enclosing structure: adopt the thick diaphragm wall of 1.0m to form corresponding water-stop curtain 1;
(c1) first adopt sleeve valve barrel grouting engineering method note dual slurry, the bottom forming slurry base plate 2 and slurry side wall 3 slurry side wall 3 and water-stop curtain 1 is closely connected, and slurry base plate 2, slurry side wall 3 and water-stop curtain form substrate U-shaped slip casting storehouse back cover structure jointly; The thick 3m of slurry base plate 2, the thick 2m of slurry side wall 3, slurry side wall 3 and the closely connected superimposed 9m of diaphragm wall;
(c2) then adopt sleeve valve barrel grouting engineering method to note single liquid slurry, form slurry partition wall 4, U-shaped slip casting storehouse is separated into multiple U-shaped slip casting storehouse, the thick 2m of slurry partition wall;
(c3) finally adopt sleeve valve barrel grouting engineering method to note single liquid slurry, above slurry base plate, carry out secondary grouting, form slurry strengthening course 5, slurry reinforcement thickness 2m;
D () applies dewatering well and water-level observation hole in hole, by underground water drainage in storehouse;
E () layer and section excavates from the top down, and set up inner support 6 in time, until be excavated to substrate;
F () to be returned along way by open cut and is built agent structure 7, sequentially remove inner support 6, and top board backfills.
Space enclosing structure adopts the thick diaphragm wall of 1.0m, building-in depth 9m, substrate 15m scope adopts mini-valve tube U-shaped U-shaped to divide storehouse slip casting back cover, the wherein thick 3m of slurry base plate, the all thick 2m of slurry side wall, slurry partition wall and slurry strengthening course, slurry side wall and the closely connected superimposed 9m of diaphragm wall, slurry base plate and side wall note dual slurry, slurry partition wall and strengthening course note single liquid slurry.Construction size as shown in Figure 5, through estimation, space enclosing structure cost about 5,370 ten thousand, slip casting expense 5,264 ten thousand, 1.5 months slip casting durations.
In sum, after adopting substrate U-shaped U-shaped described in the utility model point storehouse slip casting back cover scheme, space enclosing structure expense saves 8,590,000, and slip casting expense saves 6,016 ten thousand, and the duration saves 1.5 months.
Above-described detailed description of the invention; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only detailed description of the invention of the present utility model; and be not used in restriction protection domain of the present utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (4)
1. high artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure, comprise the water-stop curtain (1) inserting underground, it is characterized in that: be formed with slurry base plate (2), slurry side wall (3) and slurry partition wall (4) in the below of water-stop curtain (1) by slip casting, described slurry side wall (3) is closely cementing with water-stop curtain (1), slurry base plate (2), slurry side wall (3) and slurry partition wall (4) are enclosed in substrate and form multiple U-shaped slip casting storehouse to lower recess, and in slurry base plate (2) top, secondary grouting is formed with slurry strengthening course (5).
2. high artesian according to claim 1 thick sand-pebble layer deep foundation ditch slip casting back cover structure, is characterized in that: slurry base plate (2), the slurry side wall (3) in described U-shaped slip casting storehouse are formed by mini-valve tube note dual slurry.
3. high artesian according to claim 1 thick sand-pebble layer deep foundation ditch slip casting back cover structure, is characterized in that: described U-shaped slip casting storehouse, slurry partition wall (4) and slurry strengthening course (5) note single liquid slurry by mini-valve tube and formed.
4. high artesian according to claim 1 thick sand-pebble layer deep foundation ditch slip casting back cover structure, is characterized in that: in each U-shaped slip casting storehouse, all arrange water-level observation hole and dewatering well.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404974A (en) * | 2014-12-01 | 2015-03-11 | 中铁隆工程集团有限公司 | High-pressure-bearing water and thick sand and pebble formation deep foundation pit grouting bottom-sealing structure and construction technology thereof |
| CN106498960A (en) * | 2016-11-27 | 2017-03-15 | 黄明利 | A kind of harness the river method of stifled row with reference to delamination pour slurry |
| CN106609508A (en) * | 2015-10-22 | 2017-05-03 | 中铁十四局集团有限公司 | Construction technology and construction method for large-particle-size pebble stratum super-deep foundation pit in strong water permeation environment of Yellow River flood plain |
-
2014
- 2014-12-01 CN CN201420737294.1U patent/CN204252148U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404974A (en) * | 2014-12-01 | 2015-03-11 | 中铁隆工程集团有限公司 | High-pressure-bearing water and thick sand and pebble formation deep foundation pit grouting bottom-sealing structure and construction technology thereof |
| CN106609508A (en) * | 2015-10-22 | 2017-05-03 | 中铁十四局集团有限公司 | Construction technology and construction method for large-particle-size pebble stratum super-deep foundation pit in strong water permeation environment of Yellow River flood plain |
| CN106498960A (en) * | 2016-11-27 | 2017-03-15 | 黄明利 | A kind of harness the river method of stifled row with reference to delamination pour slurry |
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Owner name: ZHONGTIE TUNNEL SURVEY AND DESIGN INST., LTD. Effective date: 20150826 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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| CB03 | Change of inventor or designer information |
Inventor after: Liu Jianwei Inventor after: Li Tiesheng Inventor after: Shen Xiaobing Inventor after: Fu Bo Inventor after: Zhang Meiqin Inventor after: Meng Wei Inventor after: Li Minglei Inventor after: Liu Jingtao Inventor after: Liu Weihua Inventor after: Tan Wanzhong Inventor after: Jia Feiyu Inventor after: Lu Zhiqiang Inventor after: Gao Xiongying Inventor after: Chen Qijiao Inventor after: Pan Xiuming Inventor after: Lei Chonghong Inventor after: Lv Gaofeng Inventor after: Zhang Jianhai Inventor after: He Changjun Inventor after: Cui Zhijie Inventor after: Hao Zhihong Inventor before: Liu Jianwei Inventor before: Lu Zhiqiang Inventor before: He Changjun |
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Free format text: CORRECT: INVENTOR; FROM: LIU JIANWEI LU ZHIQIANG HE ZHANGJUN TO: LIU JIANWEI LU ZHIQIANG PAN XIUMING LEI CHONGHONG LV GAOFENG ZHANG JIANHAI HE ZHANGJUN CUI ZHIJIE HAO ZHIHONG LI TIESHENG SHEN XIAOBING FU BO ZHANG MEIQIN MENG WEI LI MINGLEI LIU JINGTAO LIU WEIHUA TAN WANZHONG JIA FEIYU GAO XIONGYING CHEN QIJIAO |
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Effective date of registration: 20150826 Address after: 610000 Sichuan city of Chengdu province Wuhou District two West Road No. 189 Vuko railway long 8 storey building Patentee after: RANKEN RAILWAY CONSTRUCTION GROUP CO., LTD. Patentee after: Zhongtie Tunnel Survey and Design Inst., Ltd. Address before: 610000 Sichuan city of Chengdu province Wuhou District two West Road No. 189 Vuko railway long 8 storey building Patentee before: RANKEN RAILWAY CONSTRUCTION GROUP CO., LTD. |