CN102888847B - Construction method free from lowering water level for local deep foundation pit of elevator shaft - Google Patents
Construction method free from lowering water level for local deep foundation pit of elevator shaft Download PDFInfo
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- CN102888847B CN102888847B CN201210398720.9A CN201210398720A CN102888847B CN 102888847 B CN102888847 B CN 102888847B CN 201210398720 A CN201210398720 A CN 201210398720A CN 102888847 B CN102888847 B CN 102888847B
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Abstract
The invention relates to a construction method for a local deep foundation pit of an elevator shaft, in particular to a construction method free from lowering water level for the local deep foundation pit of the elevator shaft. The method comprises the following steps: preparing a trapezoid box-type steel molding plate device with a bottom but without a cover by welding profile steel, angle iron and steel plates; performing water-proof treatment in the steel molding plate device, tying steel bars, and excavating the elevator foundation pit in the way of pumping water and excavating at the same time; after the elevator foundation pit is excavated, hoisting and installing the steel molding plate device at a measuring benchmark position by a crane; casting raft concrete to interior and exterior of the steel molding plate device to meet the requirements of underground water buoyance force and side pressing force; after the interior concrete reaches certain strength, cutting off the profile steel and the angle iron inside the steel molding plate device; and then performing the next step construction procedure of main building raft. The construction method is simple in operation, the steel molding plate device is good in anti-buoyance force effect, the water-proof and steel bar constructions are convenient; and after a foundation trench is excavated, when the underground water level is close to the elevation of the trench bottom, the local deep foundation pit of the elevator shaft is possible to be free from lowering the water level.
Description
Technical field
The present invention relates to water level for local deep foundation pit of elevator shaft construction method, specifically a kind of water level for local deep foundation pit of elevator shaft exempts from dewatering construction method.
Background technology
After foundation trench excavation, groundwater table and bottom land absolute altitude close to time, water level for local deep foundation pit of elevator shaft generally adopts following construction method:
1, well-points dewatering construction.Well-points dewatering is a kind of method of artificial dewatering.Before excavation of foundation pit, bury the filter pipe (well) of some in foundation ditch surrounding underground, utilize pumping equipment to draw water and make dug soil remain the method for dry state, this construction method durations is long, and cost is high, and schedule delays.
2, open caisson construction.Open caisson is the concrete pit shaft of a bottomless uncovered, is generally made up of parts such as sword pin, the borehole wall, partition walls.Cutting the earth in open caisson makes it sink, and after reaching design elevation, carries out concrete sealing bottom, fills out the heart, builds top cover, forms open caisson foundation.This construction method pit shaft is longer from being fabricated into life cycle, and difficulty is large in basil construction, open caisson deadweight is larger, and sword foot section area is little, center of gravity is higher, easily cause because of land subsidence cause open caisson ftracture or topple over, in well sinking process as run into large gravel, trunk or shaft bottom rock layer surface tilt excessive time, also by construction bring larger difficulty.The most important thing is that bottom is a difficult point without mouth waterproof when having built concrete, it can not ensure and meet waterproof and reach designing requirement.
Described in vertical upper, existing water level for local deep foundation pit of elevator shaft construction method Problems existing is: construct loaded down with trivial details, speed of application is slow, the cycle is long, cost is high.
summary of the invention
The present invention is intended to solve the problems referred to above that existing water level for local deep foundation pit of elevator shaft construction method exists, and provides a kind of after foundation trench excavation, groundwater table and bottom land absolute altitude close to time, water level for local deep foundation pit of elevator shaft can adopt the construction method exempting from precipitation.
The technical solution used in the present invention is:
A kind of water level for local deep foundation pit of elevator shaft exempts from dewatering construction method, carries out as follows:
A. uncovered trapezoidal box steel form device with the end is made by shaped steel, angle steel, Plate Welding;
B. in described steel form device, do waterproofing work, the good reinforcing bar of colligation, adopt simultaneously and draw water while the mode excavated excavates elevator foundation pit;
C., after elevator foundation pit scrapes out, with crane, described steel form device lifting is mounted to measuring basis position;
D. inside and outside described steel form device, build raft board concrete to meet buoyancy force of underground water and lateral pressure requirement simultaneously, when inner concrete reaches some strength, again inner for steel form device shaped steel and angle steel are cut away, carry out next step main building raft plate working procedure afterwards.
Steps d can also be: in described steel form device, inject water, at the outer concreting of described steel form device, to meet buoyancy force of underground water and lateral pressure requirement, when outer concrete reaches some strength, water in steel form device is drained, then raft board concrete is built, when inner concrete reaches some strength, more inner for steel form device shaped steel and angle steel are cut away, carry out next step main building raft plate working procedure afterwards.
Compared with prior art, the outstanding feature of technique scheme of the present invention is: constructing operation is easy, and steel form device anti-floating power is effective, be convenient to the construction of waterproof and reinforcing bar, after foundation trench is excavated, groundwater table and bottom land absolute altitude close to time, water level for local deep foundation pit of elevator shaft exempts from precipitation becomes possibility.
accompanying drawing explanation:
Fig. 1 is trapezoidal box steel form device plane structure schematic diagram of the present invention.
Fig. 2 is A-A cross-sectional view in Fig. 1.
Fig. 3 is B-B cross-sectional view in Fig. 1.
Fig. 4 is trapezoidal box steel form device of the present invention peripheral reinforcing bar anchor fluke arrangement diagram.
Fig. 5 is C-C cross-sectional view in Fig. 4.
In figure: 1-casing, 2-angle steel support member, 3-angle steel, 4-i iron, 5-steel plate, 6-reinforcing bar anchor fluke.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and object is only to understand content of the present invention better.Therefore, the cited case does not limit the scope of the invention.
See accompanying drawing, the water level for local deep foundation pit of elevator shaft that the present embodiment provides is exempted from dewatering construction method and is:
First, adopt angle steel support member 2, angle steel 3, i iron 4, steel plate 5 welding production uncovered steel form device with the end, this steel form device one side box body 1 forms trapezoidal case structure in oblique (see figure 2), on the peripheral angle steel 3 of casing 1, welded reinforcement anchor fluke 6(is shown in Fig. 4, Fig. 5), angle steel 3 is L63 angle steel, reinforcing bar anchor fluke 6 is 25 screw-thread steels, and reinforcing bar anchor fluke 6 spacing is 500MM, and length is also 500MM.
Steel form device does waterproofing work within it after making and the good reinforcing bar of colligation.
Secondly, elevator foundation pit adopts draws water while after the method excavated scrapes out, arrange crane hanging component steel form device to measuring basis position, then build raft board concrete to meet buoyancy force of underground water and lateral pressure requirement outward within it simultaneously, when inner concrete reaches some strength, establishment officer cuts away its inner shaped steel and angle steel, just normally can carry out next step main building raft plate working procedure afterwards.
Or, in the lifting of steel form device to measuring basis position, water, the outer concreting of steel form device is injected to meet buoyancy force of underground water and lateral pressure requirement in steel form device, when outer concrete reaches some strength, water in steel form device is drained, and then concreting, when inner concrete reaches some strength, establishment officer cuts away inner for steel form device shaped steel and angle steel, carries out the construction of main building raft plate afterwards.
Claims (2)
1. water level for local deep foundation pit of elevator shaft exempts from a dewatering construction method, it is characterized in that, it carries out as follows:
A. uncovered trapezoidal box steel form device with the end is made by shaped steel, angle steel, Plate Welding;
B. in described steel form device, do waterproofing work, the good reinforcing bar of colligation, adopt simultaneously and draw water while the mode excavated excavates elevator foundation pit;
C., after elevator foundation pit scrapes out, with crane, described steel form device lifting is mounted to measuring basis position;
D. inside and outside described steel form device, build raft board concrete simultaneously, to meet buoyancy force of underground water and lateral pressure requirement, when inner concrete reaches some strength, more inner for steel form device shaped steel and angle steel are cut away, carry out next step main building raft plate working procedure afterwards.
2. water level for local deep foundation pit of elevator shaft exempts from a dewatering construction method, it is characterized in that, it carries out as follows:
A. uncovered trapezoidal box steel form device with the end is made by shaped steel, angle steel, Plate Welding;
B. in described steel form device, do waterproofing work, the good reinforcing bar of colligation, adopt simultaneously and draw water while the mode excavated excavates elevator foundation pit;
C., after elevator foundation pit scrapes out, with crane, described steel form device lifting is mounted to measuring basis position;
D. in described steel form device, water is injected, at the outer concreting of described steel form device, to meet buoyancy force of underground water and lateral pressure requirement, when outer concrete reaches some strength, water in steel form device is drained, then raft board concrete is built, when inner concrete reaches some strength, more inner for steel form device shaped steel and angle steel are cut away, carry out next step main building raft plate working procedure afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210398720.9A CN102888847B (en) | 2012-10-19 | 2012-10-19 | Construction method free from lowering water level for local deep foundation pit of elevator shaft |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210398720.9A CN102888847B (en) | 2012-10-19 | 2012-10-19 | Construction method free from lowering water level for local deep foundation pit of elevator shaft |
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| CN102888847A CN102888847A (en) | 2013-01-23 |
| CN102888847B true CN102888847B (en) | 2014-12-24 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103774698B (en) * | 2014-02-14 | 2015-05-06 | 中国十九冶集团有限公司 | Soil engineering drainage-free construction method |
| CN104975607A (en) * | 2015-07-22 | 2015-10-14 | 中建八局第二建设有限公司 | Offshore area local deep foundation pit stanching pit construction method |
| CN105133619B (en) * | 2015-08-07 | 2017-07-21 | 中国一冶集团有限公司 | Elevator construction method of deep foundation ditch |
| CN106498951B (en) * | 2016-11-30 | 2019-02-05 | 上海市机械施工集团有限公司 | A kind of shaft excavation construction method |
| CN107938681A (en) * | 2017-11-26 | 2018-04-20 | 上海宝冶集团有限公司 | Way after concrete sump |
| CN112464353A (en) * | 2020-12-18 | 2021-03-09 | 中国二十冶集团有限公司 | BIM-based modeling method and system for special-shaped wall |
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| JPH0699940B2 (en) * | 1989-12-27 | 1994-12-12 | 株式会社間組 | Method of constructing underground skeleton and formwork for underground skeleton construction |
| CN101457528A (en) * | 2007-12-14 | 2009-06-17 | 卢锡雷 | Seamless joint pipe caisson pouring row pile construction technique |
| CN101481910B (en) * | 2009-01-09 | 2010-07-07 | 江苏省华建建设股份有限公司 | Construction method of foundation pit slope supported independent pile tower crane foundation |
| CN101538868A (en) * | 2009-02-06 | 2009-09-23 | 青海省电力设计院 | Everfrost and saline soil region transmission line pole glass fiber reinforced plastic foundation construction method |
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