CN109610492A - A kind of open caisson construction method of Unfavorable geology - Google Patents
A kind of open caisson construction method of Unfavorable geology Download PDFInfo
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- CN109610492A CN109610492A CN201811435897.5A CN201811435897A CN109610492A CN 109610492 A CN109610492 A CN 109610492A CN 201811435897 A CN201811435897 A CN 201811435897A CN 109610492 A CN109610492 A CN 109610492A
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- open caisson
- segment
- soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
Abstract
The present invention relates to a kind of open caisson construction method of Unfavorable geology, specifically comprises the following steps: S1, to excavating carries out preliminary smooth, the formwork erection for then carrying out first segment open caisson pours, then carries out first segment open caisson and excavate sinking construction；S2, the soil for excavating first segment open caisson periphery simultaneously coat one layer of release materials in open caisson outer wall, then form dressing plate to first segment open caisson periphery casting concrete；S3, the formwork erection that the second section open caisson is carried out on first segment open caisson pour, and then carry out excavation sinking construction；S4, open caisson construction method in step S3 is repeated, until open caisson overall height reaches projected depth, the open caisson of lower layer is reserved with multiple limbers when formwork erection pours, back cover construction is carried out to open caisson again, load-bearing concrete finally is poured in the top layer open caisson surrounding for being higher than dressing plate, obtains the open caisson that can be applicable to Unfavorable geology；The open caisson construction method of the Unfavorable geology can make open caisson sink vertically, and construction precision is high, and is not susceptible to open caisson integral sinking.
Description
Technical field
The present invention relates to open caisson construction field, the open caisson construction method of specifically a kind of Unfavorable geology.
Background technique
In recent years, it due to underground olighydria, builds open caisson just and becomes and gather the main water storage of surface water and groundwater and build
Object is built, to solve the problems, such as agricultural irrigation, industrial production and people's domestic water.Well sinking is that one kind is suitable for unstable contain
The special construction method of water layer, but build during open caisson, according to engineering geological condition and engineering characteristic, if sinking construction
It is improper, it may occur that quality problems.It is easy to cause inclination of open caisson or open caisson to deviate in high depth, pure drift sand geology open caisson, causes
The main reason for inclination of open caisson or open caisson deviate is as follows: inclination of open caisson is mainly due to the soft or hard unevenness of soil under caisson cutting edge；No
Equably cutting the earth makes difference in height great disparity in native face in well；It is emptied under blade foot excessively, open caisson sinks suddenly.
Application No. is the Chinese invention patent applications of CN106088127A to disclose a kind of open caisson construction method, which applies
Corresponding open caisson construction mode is divided into three phases by work method, is respectively just sunk stage, normal sinking stage, eventually heavy stage,
And stringent monitoring is carried out to the case where each open caisson construction stage, once detecting that well sinking shifts, use immediately
One or more kinds of satisfactory after correcting rectify a deviation to open caisson.However, this open caisson construction method need in real time to open caisson construction into
Row monitoring, and the mode of the opportunity of the corresponding correction of accurate control and correction, construction technical requirement is high, repeatedly takes satisfactory after correcting
Construction speed is easily influenced, construction efficiency is lower, and twisting resistance is easy to damage open caisson during correction, reduces open caisson
Intensity and service life.
Application No. is the Chinese invention patent applications of CN102155020A to disclose a kind of reinforcing bar for weak soil stratum
Concrete open caisson construction method, the concrete reinforcement sunk well construction method for being used for weak soil stratum are broken ground using waterpower, can be kept away
Exempt to dig pot bottom, reduces the prominent heavy phenomenon of open caisson, be easy to guarantee open caisson construction quality, break ground program and position, energy can be effectively controlled
So that open caisson is steadily sunk, convenient for control open caisson end heavy absolute altitude, reduces engineering cost.However, after the completion of this open caisson construction method,
Mainly by soil to the supporting role in shaft bottom and soil to the rubbing action of open caisson outer wall come supporting caisson, for marsh,
Or the Unfavorable geologies such as drift sand, often there is a phenomenon where integral sinkings for the open caisson after construction, significantly reduce the service life of open caisson.
Summary of the invention
In order to solve the above problem present in the prior art, the present invention provides a kind of open caisson construction sides of Unfavorable geology
Method, run-off the straight when can limit well sinking by the vertical correction hole on dressing plate, effectively can make open caisson sink vertically, apply
Work precision is high；Top layer open caisson and dressing plate pour together, can make open caisson mounting on the ground, and it is whole can to effectively reduce open caisson generation
Body sinks.
Technical scheme is as follows:
A kind of open caisson construction method of Unfavorable geology, specifically comprises the following steps:
S1: to excavating carry out it is preliminary smooth, it is preliminary it is smooth after ground on carry out the formwork erection of first segment open caisson and pour, first
Section open caisson carries out excavation sinking construction after the completion of pouring；
S2: when sinking down into ground level or a little higher than ground level at the top of first segment open caisson, stop excavating sinking construction；Then
Excavate the soil of first segment open caisson periphery and coat one layer of release materials in open caisson outer wall, then first segment open caisson periphery is poured mixed
Solidifying soil, obtains the dressing plate with vertical correction hole after concrete setting；
S3: the formwork erection that the second section open caisson is carried out on first segment open caisson pours, and the second section open caisson is excavated down after the completion of pouring
Heavy construction；
S4: the open caisson construction method in step S3 that repeats is constructed, if finding in sinking construction, open caisson offset or inclination are adopted in time
It takes and rectifys inclined measure, until open caisson overall height reaches projected depth, the open caisson of top layer is higher by dressing plate, and the open caisson of lower layer is vertical
Multiple limbers are reserved with when mould pours；
S5: after open caisson generally reaches projected depth, back cover construction is carried out to open caisson interior lower end；
S6: load-bearing concrete is poured in the top layer open caisson surrounding for being higher than dressing plate, the open caisson of top layer is fixed with dressing plate.
Preferably, it when first segment open caisson formwork erection pours in the step S1, pours in first segment open caisson lower end for being embedded in
The blade foot of soil.
Preferably, it when first segment open caisson formwork erection pours in the step S1, pours to be formed in first segment open caisson lower end inner wall
Groove.
Preferably, the release materials in the step S2 are PVC film.
Preferably, the excavation sinking construction method is that bowl-type is broken ground mode: first digging intermediate soil, then gradually digs to four
Week；Every layer of the intermediate soil is cut the earth with a thickness of 0.6m-0.85m, and every layer of surrounding soil is cut the earth with a thickness of 0.3m-0.6m.
Preferably, the shoveling method of the surrounding soil are as follows: to blade foot direction skiving soil layer, until open caisson is in gravity
Issue give birth to it is heavy.
Preferably, the strong inclined measure in the step S4 are as follows: the high side of counter blade placement of foot takes soil more, reduces soil counter blade
The frontal drag of underfooting side；The low side of counter blade placement of foot takes soil less or does not take soil, keeps the front resistance of soil counter blade underfooting side
Power, until the central axes of open caisson are overlapped with design middle line.
Preferably, the bottom sealing method in the step S5 are as follows: first bottom end pours plain concrete in first segment open caisson, then
The pouring reinforcement concrete again in plain concrete layer；The armored concrete is cast in above plain concrete and in groove.
Preferably, load-bearing reinforcing bar is provided in the load-bearing concrete；Load-bearing reinforcing bar one end is fixed on dressing plate
The open caisson surrounding of top.
The invention has the following beneficial effects:
1, a kind of open caisson construction method of Unfavorable geology of the present invention can shape after the concrete setting that first segment open caisson periphery pours
At the dressing plate for having vertical correction hole, vertical correction hole can effectively limit open caisson run-off the straight in sinking watching, thus
Open caisson is effectively ensured to sink vertically, improves caisson sinking construction precision, the reduction later period, which is employed many times, to be rectified inclined measure and slow down construction
Progress, construction efficiency are high.
2, a kind of open caisson construction method of Unfavorable geology of the present invention, the load-bearing that top layer open caisson pours the reinforcing bar containing load-bearing outside are mixed
Solidifying soil, effectively can be such that open caisson is fixed on dressing plate, while can efficiently use the harder soil supporting caisson in upper layer, and it is heavy to improve
The forced area of well can effectively reduce open caisson and integral sinking occurs.
3, a kind of open caisson construction method of Unfavorable geology of the present invention is excavated sinking construction method and is broken ground mode using bowl-type,
Intermediate soil, then gradually layer-by-layer, comprehensive, symmetrical, the uniform skiving soil layer to blade foot direction are first quickly dug, what this segmentation was cut the earth
Shoveling efficiency had not only can be improved in method, but also open caisson can be kept steadily to sink, and is not susceptible to open caisson and tilts suddenly, construction precision
Height, efficiency are fast.
4, a kind of open caisson construction method of Unfavorable geology of the present invention, when bottom sealing, successively pour coagulation of being always or usually as specified from top to bottom
Soil and armored concrete effectively can carry out back cover to open caisson, and back cover effect is good.
5, a kind of open caisson construction method of Unfavorable geology of the present invention, armored concrete is cast in above plain concrete and groove
It is interior, so that the plain concrete of back cover and armored concrete and open caisson is formed an entirety, armored concrete and open caisson can be effectively improved
Bonding strength.
Detailed description of the invention
Fig. 1 is structural schematic diagram when formwork erection of the present invention pours first segment open caisson；
Fig. 2 is the structural schematic diagram when present invention pours dressing plate；
Fig. 3 is the structural schematic diagram of dressing plate when Fig. 2 removes open caisson；
Fig. 4 is structural schematic diagram when formwork erection of the present invention pours the second section open caisson；
Fig. 5 is structural schematic diagram when open caisson of the present invention reaches projected depth；
Fig. 6 is the structural schematic diagram when present invention pours plain concrete and armored concrete；
Fig. 7 is the structural schematic diagram when present invention pours load-bearing concrete.
Appended drawing reference indicates in figure are as follows:
1, open caisson；10, blade foot；11, groove；2, dressing plate；20, vertical correction hole；3, load-bearing concrete；30, load-bearing reinforcing bar；
4, plain concrete；5, armored concrete.
Specific embodiment
It is next in the following with reference to the drawings and specific embodiments that the present invention will be described in detail.
Referring to Fig. 1 to Fig. 7, a kind of open caisson construction method of Unfavorable geology, steps are as follows for Specific construction:
S1: to excavating carry out it is preliminary smooth, it is preliminary it is smooth after ground on carry out the formwork erection of first segment open caisson 1 and pour, the
When one section open caisson, 1 formwork erection pours, the blade foot 10 for being embedded in soil is poured in 1 lower end of first segment open caisson, and in first segment open caisson 1
Lower end inner wall pours to form groove 11；Blade foot 10 is to reduce soil to the resistance of first segment open caisson 1, and groove 11 is to increase
Seal up the concrete at bottom and the bond strength of open caisson 1.First segment open caisson 1 pours and carries out excavation sinking construction after the completion, under excavation
Sinking construction method is all made of bowl-type and breaks ground mode, i.e., first digs intermediate soil, then gradually to 10 direction of blade foot successively, comprehensively, it is symmetrical,
It uniformly digs around, every layer of intermediate soil is cut the earth with a thickness of 0.6m-0.85m, and every layer of surrounding soil is cut the earth with a thickness of 0.3m-
0.6m；
S2: when sinking down into ground level or a little higher than ground level at the top of first segment open caisson 1, stop excavating sinking construction；So
The soil of 1 periphery of first segment open caisson is excavated afterwards and coats one layer of PVC film in 1 outer wall of open caisson, then 1 periphery of first segment open caisson is poured
Concrete is built, the dressing plate 2 with vertical correction hole 20 is obtained after concrete setting；It is heavy that vertical correction hole 20 can be limited effectively
The run-off the straight in sinking watching of well 1 sinks vertically so that open caisson 1 be effectively ensured, improves 1 sinking construction precision of open caisson, reduces
Later period, which is employed many times, to be rectified inclined measure and slows down construction speed, and construction efficiency is high；
S3: the formwork erection that the second section open caisson 1 is carried out on first segment open caisson 1 pours, and the second section open caisson 1 is excavated after the completion of pouring
Sinking construction, with the progress for excavating sinking construction, first segment and the second section open caisson 1 gradually sink under the effect of gravity；
S4: repeating 1 construction method of open caisson in step S3 and construct, if finding in sinking construction, the offset of open caisson 1 or inclination are timely
It takes and rectifys inclined measure, until 1 overall height of open caisson reaches projected depth；Rectifying inclined measure is that the side high to 10 position of blade foot takes more
Soil reduces frontal drag of the soil to 10 lower section of blade foot；The side low to 10 position of blade foot takes soil less or does not take soil, keeps soil
Frontal drag to the lower section of blade foot 10, make open caisson 1 is steady, return it is positive sink, until the central axes of open caisson 1 are overlapped with middle line is designed；
The open caisson 1 of top layer is higher by dressing plate 2, and the open caisson 1 of lower layer is reserved with multiple limbers 12 when formwork erection pours, and limbers 12 can
The water inside and outside well is set to swap circulation；
S5: after open caisson 1 generally reaches projected depth, first bottom end pours plain concrete 4 in first segment open caisson 1, then in element
Pouring reinforcement concrete 5, armored concrete 5 are cast in above plain concrete 4 and in groove 11, so that back cover again on concrete layer
Plain concrete 4 and armored concrete 5 be firmly combined together with open caisson 1, improve back cover effect；
S6: in the fixed load-bearing reinforcing bar 30 of 1 surrounding of top layer open caisson for being higher than dressing plate 2 or when formwork erection pours top layer open caisson 1
In the reserved load-bearing reinforcing bar 30 being bent outwardly in upper end, load-bearing concrete 3 is then poured again, can effectively make open caisson 1 and the school of top layer
Positive platform 2 is fixed, while can efficiently use the harder soil supporting caisson 1 in upper layer, improves the forced area of open caisson 1, can be effective
It reduces open caisson 1 and integral sinking occurs, finally obtain the open caisson that can be applicable to Unfavorable geology.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (9)
1. a kind of open caisson construction method of Unfavorable geology, which is characterized in that specifically comprise the following steps:
S1: to excavating carry out it is preliminary smooth, it is preliminary it is smooth after ground on carry out the formwork erection of first segment open caisson (1) and pour,
First segment open caisson (1) carries out excavation sinking construction after the completion of pouring；
S2: when sinking down into ground level or a little higher than ground level at the top of first segment open caisson (1), stop excavating sinking construction；
Then excavate the soil of first segment open caisson (1) periphery and coat one layer of release materials in open caisson (1) outer wall, then to first segment open caisson
(1) peripheral casting concrete, obtains the dressing plate (2) with vertical correction hole (20) after concrete setting；
S3: the formwork erection that the second section open caisson (1) is carried out on first segment open caisson (1) pours, and it is laggard that the second section open caisson (1) pours completion
Row excavates sinking construction；
S4: repeating open caisson (1) construction method in step S3 and construct, if finding open caisson (1) offset or inclination in sinking construction
It takes in time and rectifys inclined measure, until open caisson (1) overall height reaches projected depth, the open caisson (1) of top layer is higher by dressing plate
(2), the open caisson (1) of lower layer is reserved with multiple limbers (12) when formwork erection pours；
S5: after open caisson (1) generally reaches projected depth, back cover construction is carried out to open caisson (1) interior lower end；
S6: be higher than dressing plate (2) top layer open caisson (1) surrounding pour load-bearing concrete (3), by the open caisson (1) of top layer with
Dressing plate (2) is fixed.
2. the open caisson construction method of Unfavorable geology as described in claim 1, it is characterised in that: first segment is heavy in the step S1
When well (1) formwork erection pours, the blade foot (10) for being embedded in soil is poured in first segment open caisson (1) lower end.
3. the open caisson construction method of Unfavorable geology as described in claim 1, it is characterised in that: first segment is heavy in the step S1
When well (1) formwork erection pours, pour to form groove (11) in first segment open caisson (1) lower end inner wall.
4. the open caisson construction method of Unfavorable geology as described in claim 1, it is characterised in that: the Mould release material in the step S2
Material is PVC film.
5. the open caisson construction method of Unfavorable geology as described in claim 1, which is characterized in that the excavation sinking construction method
It breaks ground mode for bowl-type: first digging intermediate soil, then gradually dig around；Every layer of the intermediate soil is cut the earth with a thickness of 0.6m-
Every layer of 0.85m, surrounding soil is cut the earth with a thickness of 0.3m-0.6m.
6. the open caisson construction method of Unfavorable geology as claimed in claim 5, which is characterized in that the earth excavation of the surrounding soil
Method are as follows: to blade foot (10) direction skiving soil layer, until open caisson (1) sinks under the effect of gravity.
7. the open caisson construction method of Unfavorable geology as described in claim 1, which is characterized in that strong in the step S4 is arranged partially
It applies are as follows: the side high to blade foot (10) position takes soil more, reduces soil to the frontal drag below blade foot (10)；To blade foot (10)
The low side in position takes soil less or does not take soil, keeps soil to the frontal drag below blade foot (10), until the axis of open caisson (1)
Line is overlapped with design middle line.
8. the open caisson construction method of Unfavorable geology as claimed in claim 3, which is characterized in that the back cover side in the step S5
Method are as follows: first in first segment open caisson (1) interior bottom end pour plain concrete (4), then the pouring reinforcement coagulation again in plain concrete layer
Native (5)；The armored concrete (5) is cast in above plain concrete (4) and in groove (11).
9. the open caisson construction method of Unfavorable geology as described in claim 1, it is characterised in that: in the load-bearing concrete (3)
It is provided with load-bearing reinforcing bar (30)；Described load-bearing reinforcing bar (30) one end is fixed on open caisson (1) surrounding above dressing plate (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811435897.5A CN109610492B (en) | 2018-11-28 | 2018-11-28 | Open caisson construction method for weak geology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811435897.5A CN109610492B (en) | 2018-11-28 | 2018-11-28 | Open caisson construction method for weak geology |
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| CN109610492A true CN109610492A (en) | 2019-04-12 |
| CN109610492B CN109610492B (en) | 2021-03-23 |
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| CN108842798A (en) * | 2018-06-27 | 2018-11-20 | 上海城建市政工程（集团）有限公司 | A kind of static pressure sinking construction method of prefabricated after-pouring formula open caisson |
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2018
- 2018-11-28 CN CN201811435897.5A patent/CN109610492B/en active Active
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| CN103205978A (en) * | 2013-04-18 | 2013-07-17 | 成军 | High-permeability zone under-water-level elevator foundation pit open caisson moulding bed construction method |
| CN103343544A (en) * | 2013-07-16 | 2013-10-09 | 江西建工第一建筑有限责任公司 | Construction method for large-scale open caisson |
| CN104988940A (en) * | 2015-05-19 | 2015-10-21 | 中铁大桥局集团有限公司 | Guiding method and device used for positioning steel open caisson |
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| CN108842798A (en) * | 2018-06-27 | 2018-11-20 | 上海城建市政工程（集团）有限公司 | A kind of static pressure sinking construction method of prefabricated after-pouring formula open caisson |
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