CN104975607A - Offshore area local deep foundation pit stanching pit construction method - Google Patents

Offshore area local deep foundation pit stanching pit construction method Download PDF

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Publication number
CN104975607A
CN104975607A CN201510432763.8A CN201510432763A CN104975607A CN 104975607 A CN104975607 A CN 104975607A CN 201510432763 A CN201510432763 A CN 201510432763A CN 104975607 A CN104975607 A CN 104975607A
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China
Prior art keywords
water
concrete
concreting
bottom land
stopping trough
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Pending
Application number
CN201510432763.8A
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Chinese (zh)
Inventor
陈吉光
邹宇
刘洋洋
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Second Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
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Second Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
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Application filed by Second Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd filed Critical Second Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
Priority to CN201510432763.8A priority Critical patent/CN104975607A/en
Publication of CN104975607A publication Critical patent/CN104975607A/en
Pending legal-status Critical Current

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Abstract

The invention provides an offshore area local deep foundation pit stanching pit construction method and relates to the technical field of foundation construction. The method comprises the first step of earth excavation, the second step of manufacturing of a checkered water stop steel molding plate, the third step of hoisting of the checkered water stop steel molding plate, the fourth step of concrete pouring of the bottom of a stanching pit, the fifth step of concrete pouring of the side faces of the stanching pit, and the sixth step of concrete chiseling and finishing of the bottom of the stanching pit. Through the dead weight and self-waterproofing performance of concrete in combination with the water stop performance of checkered steel plates and common waterproof steel plates, water stop of a local deep foundation pit in an offshore area is achieved.

Description

Neritic zone water level for local deep foundation pit water stopping trough construction method
Technical field
The present invention relates to the technical field of construction of foundation, specifically a kind of neritic zone water level for local deep foundation pit water stopping trough construction method.
Background technology
Along with the continuous quickening of socio-economic development and process of modernization, urban land day is becoming tight, and neritic zone engineering construction gets more and more, and in the Process of Engineering Construction of neritic zone, the construction of foundation is particularly important; Due to the tidal effect of seawater, sealing construction for locally deep pits such as baseset puddle, neritic zone, elevator shafts becomes a large difficult point of neritic zone foundation construction, current existing neritic zone water-stop technology is as water-stop curtain etc., and construction cost is high, long in time limit, and stagnant water effect is undesirable.
Summary of the invention
Technical assignment of the present invention be for neritic zone water level for local deep foundation pit sealing provide that a kind of cost is lower, the fast and construction method that stagnant water effect is good of speed of application.
Water level for local deep foundation pit water stopping trough construction technology technological principle utilizes concrete deadweight, self waterproofing performance, in conjunction with the sealing performance of checkered steel plate, common steel plate for sealing water, realizes the sealing of neritic zone water level for local deep foundation pit.Checkered steel plate water stopping trough is processed in advance by backstage, saves duration and cost is lower, and the technological process of this technology and Specific construction step see below introduction.
Technical scheme of the present invention is
Neritic zone water level for local deep foundation pit water stopping trough construction method, its technological process comprises:
1), soil excavation;
2), decorative pattern water-stopping steel template construct;
3), decorative pattern water-stopping steel template hangs;
4), water stopping trough bottom land concrete placings;
5), water stopping trough groove side concrete placings;
6), water stopping trough bottom land concrete picks cutter, finishing.
Soil excavation:
According to designing requirement, water level for local deep foundation pit is excavated, soil excavation should take into full account engineering geology and groundwater table factor, natural discharging slope or supporting are taked to excavation slope, cuts stake machine during excavation and coordinate a pile crown to abolish, so that soil excavation in elevator shaft or the well that catchments.
Decorative pattern water-stopping steel template construct:
Overall decorative pattern water-stopping steel template adopts the thick checkered steel plate butt welding of 3.5mm to form, and negative and positive angular position adopts the solid limit of angle steel; For ease of lifting, decorative pattern water-stopping steel template inside adopts upper and lower two-layer angle steel to support, and lower floor is positioned at bottom checkered steel plate, and upper strata distance steel template is suitable for reading is 300mm, and suspension centre suitable for reading adopts reinforcing bar and the Plate Welding of HPB300 level diameter 20; Water-stopping steel template absolute altitude suitable for reading is higher than water level elevation, and end mouth absolute altitude is lower than the basis end below absolute altitude 700mm.
Adopt the object of decorative pattern steel plate for sealing water to be the needs that follow-up foundation pit side-wall waterproof coiled material construct, checkered steel plate facade can plaster leveling, is convenient to waterproof coiled material and constructs; The common steel plate for sealing water of 300mm place welding at the bottom of distance water stopping trough.Checkered steel plate facade can smear ash composition: 1:3 cement mortar, and 15mm is thick, inside mixes 5%108 glue.
Decorative pattern water-stopping steel template hangs:
Tower crane is adopted to coordinate mobile crane to hang in foundation ditch; Before hanging, need setting-out, and need bottom steel plate for sealing water, build piled bricks by laying bricks or stones and spacer bars is set.
The concreting of water stopping trough bottom land:
According to on-the-spot hydrologic regime and concrete material performance, water stopping trough bottom land concrete thickness gets 0.7m; Foul water pump is set in water stopping trough side and carries out auxiliary precipitation;
1) advance observations seawer tide situation, selects the concreting when neap;
2) consider the impact of seawater fluctuation tide, during concreting, take tremie method to assist underwater concreting, add early strength admixture to ensure concrete compaction;
3) after considering that bottom land concreting completes, easily cracking phenomena is produced under the buoyancy of seawater, then need before bottom land concreting, on bottom land concrete top, C8@100 reinforced mesh is set, and C8 100 cracking resistance reinforced mesh is set up in concrete middle part, be out of shape to prevent concrete autogenous shrinkage and form vertical through crack;
4), after considering that bottom land concreting completes, 20 × 30mm expansion sealing strip is set in bottom land concrete thickness scope pile body border;
5), after considering that bottom land concreting completes, the common steel plate for sealing water of weldering is increased in bottom land concrete middle part.
The concreting of water stopping trough sidewall:
Treat bottom land concrete final set after-pouring water stopping trough sidewall concrete, consider that checkered steel plate bears concrete lateral pressure impact, for preventing its extrusion, in groove, Steel-pipe scaffold is set up to support before concreting, vertical rod array pitch, span 500mm, cloth, apart from 500mm, answers layering around building during concreting, lift height controls within 300mm, after the concreting of water stopping trough side completes, can transfer to foul water pump according to on-the-spot water level conditions; Ensure continuous concreting, avoid forming bubble and cold seam in concrete.
Bottom land concrete picks cutter, finishing:
After the final set of water stopping trough sidewall concrete, remove groove inner support frame, after treating that support body dismounting is cleared, raggle base concrete can be picked; Need before picking cutter to release the sump position line, adopt electric pick layering to break to design elevation around sump locations of structures informant work, pick the shaping absolute altitude of cutter, water stopping trough top mark is high should consider Base isolation system bed course, waterproof and protective layer thickness thereof.
The beneficial effect of this method is
Complete the local sealing of baseset puddle, elevator shaft, respond well, speed of application be fast, remarkable benefit.After the concreting of water stopping trough bottom land completes, bottom land is without ponding, and workman can stand in bottom land construction.
Duration benefit: water level for local deep foundation pit water stopping trough construction technology is simple, stagnant water effect is good, easy construction, checkered steel plate can be welded before construction prerequisite, do not take the main building foundation construction duration, after checkered steel plate completes, adopt tower crane to hang, compared with other sealing technique, can the reduction of erection time 50 ~ 60%;
Economic benefit: under equal conditions, with other sealing techniques as compared with water-stop curtain, water level for local deep foundation pit water stopping trough construction cost is the 20%-30% of water-stop curtain.
Accompanying drawing explanation
Fig. 1 is water level for local deep foundation pit water stopping trough construction plan;
Fig. 2 is water level for local deep foundation pit water stopping trough construction 1-1 sectional drawing;
Fig. 3 is water level for local deep foundation pit water stopping trough construction 2-2 sectional drawing;
Fig. 4-1 is two-layer angle steel inner support plan view on water stopping trough;
Fig. 4-2 is two-layer angle steel inner support plan view under water stopping trough;
Fig. 5 is water stopping trough checkered steel plate sectional drawing;
Fig. 6 is water stopping trough inner support frame sectional drawing.
Detailed description of the invention
More detailed elaboration is carried out to content of the present invention below:
Technical assignment of the present invention be for neritic zone water level for local deep foundation pit sealing provide that a kind of cost is lower, the fast and construction method that stagnant water effect is good of speed of application.
The workflow of this technology and Specific construction step see below introduction:
Technological process: soil excavation decorative pattern water-stopping steel template construct decorative pattern water-stopping steel template hangs water stopping trough bottom land concrete placings water stopping trough groove side concrete placings water stopping trough bottom land concrete picks cutter, finishing.
in Fig. 1,1. number line is elevator shaft inwall; 2. number line is decorative pattern water-stopping steel template sideline; 3. number line is soil excavation hemline; 4. number line is water stopping trough concrete top curve; 5. number line is soil excavation top curve.
Specific construction step:
1, soil excavation
According to designing requirement, water level for local deep foundation pit is excavated, soil excavation should take into full account the factor such as engineering geology and groundwater table, natural discharging slope or supporting are taked to excavation slope, cuts stake machine during excavation and coordinate a pile crown to abolish, so that soil excavation in elevator shaft or the well that catchments.
2, decorative pattern water-stopping steel template construct
Overall decorative pattern water-stopping steel template adopts the thick checkered steel plate butt welding of 3.5mm to form, and negative and positive angular position adopts the solid limit of angle steel (L75 × 75 × 3.5mm).For ease of lifting, decorative pattern water-stopping steel template inside adopts upper and lower two-layer angle steel to support, and accompanying drawing 4-1 is seen on upper strata, accompanying drawing 4-2 sees in lower floor, lower floor is positioned at bottom checkered steel plate, and upper strata distance steel template is suitable for reading is 300mm, and suspension centre suitable for reading adopts reinforcing bar and the Plate Welding of HPB300 level diameter 20.Water-stopping steel template absolute altitude suitable for reading must higher than water level elevation, and end mouth absolute altitude must lower than the basis end below absolute altitude 700mm (ensureing that there is the concrete of adequate thickness at the end, basis, to compress buoyancy force of underground water).
Adopt the object of decorative pattern steel plate for sealing water to be the needs that follow-up foundation pit side-wall waterproof coiled material is constructed, checkered steel plate facade can be plastered, and (1:3 cement mortar, 15mm is thick, inside mixes 5%108 glue) is levelling, is convenient to waterproof coiled material construction.The common steel plate for sealing water of 300mm place welding at the bottom of distance water stopping trough, see accompanying drawing 5, object is to prevent underground water from gushing out from checkered steel plate and bottom land concrete gap.
3, decorative pattern water-stopping steel template hangs
Adopt tower crane to coordinate mobile crane to hang in foundation ditch, hoisting point position is shown in shown in accompanying drawing 4-1.Before hanging, need setting-out, and need bottom steel plate for sealing water, build piled bricks by laying bricks or stones and spacer bars is set.
4, water stopping trough bottom land concreting
According to on-the-spot hydrologic regime and concrete material performance, water stopping trough bottom land concrete (C20) thickness gets 0.7m.Foul water pump is set in water stopping trough side and carries out auxiliary precipitation.
1) advance observations seawer tide situation, selects rationally to build the time, should select the concreting when neap.
2) consider the impact of seawater fluctuation tide, during concreting, take tremie method to assist underwater concreting, add early strength admixture to ensure concrete compaction.
3) after considering that bottom land concreting completes, easily cracking phenomena is produced under the buoyancy of seawater, then need before bottom land concreting, on bottom land concrete top, C8@100 reinforced mesh is set, and C8 100 cracking resistance reinforced mesh is set up in concrete middle part, be out of shape to prevent concrete autogenous shrinkage and form vertical through crack (having a position reinforced mesh to disconnect).
4), after considering that bottom land concreting completes, under buoyant of sea water effect, engineering pile border is weak link, should occur seepage, therefore need arrange 20 × 30mm expansion sealing strip in bottom land concrete thickness scope pile body border.
5) after considering that bottom land concreting completes, form constuction joint between bottom land concrete and decorative pattern steel plate for sealing water, should seep water, therefore need increase the common steel plate for sealing water of weldering (100 × 50mm) in bottom land concrete middle part, see accompanying drawing 5.
After taking the concreting of above measure bottom land to complete, stagnant water effect: in a large amount of seawater situation in groove side, bottom land is still without ponding.
5, water stopping trough sidewall concreting
Treat bottom land concrete final set after-pouring water stopping trough sidewall concrete, consider that checkered steel plate bears concrete lateral pressure impact, for preventing its extrusion, before concreting, set up Steel-pipe scaffold in groove to support, vertical rod array pitch, span 500mm, cloth is apart from 500mm, see Fig. 6, answer layering around building during concreting, lift height controls within 300mm, after the concreting of water stopping trough side completes, can transfer to foul water pump according to on-the-spot water level conditions.In order to ensure water stopping trough concrete pouring quality, should continuous concreting be ensured, avoid forming bubble and cold seam in concrete.
6, bottom land concrete picks cutter, finishing
Because sump elevation design is generally lower than concreting under elevator shaft absolute altitude and river channels, absolute altitude is wayward, therefore needs to pick cutter, trim slots base concrete, meets design requirement.
After the final set of water stopping trough sidewall concrete, remove groove inner support frame, after treating that support body dismounting is cleared, raggle base concrete can be picked.Need before picking cutter to release the sump position line, adopt electric pick layering to break to design elevation around sump locations of structures informant work, pick the shaping absolute altitude of cutter, water stopping trough top mark is high should consider Base isolation system bed course, waterproof and protective layer thickness thereof.

Claims (8)

1. neritic zone water level for local deep foundation pit water stopping trough construction method, it is characterized in that, workflow comprises:
1), soil excavation;
2), decorative pattern water-stopping steel template construct;
3), decorative pattern water-stopping steel template hangs;
4), water stopping trough bottom land concrete placings;
5), water stopping trough groove side concrete placings;
6), water stopping trough bottom land concrete picks cutter, finishing.
2. method according to claim 1, is characterized in that,
Described soil excavation:
Excavate water level for local deep foundation pit, soil excavation should take into full account engineering geology and groundwater table factor, takes natural discharging slope or supporting to excavation slope, cuts stake machine and coordinate a pile crown to abolish during excavation, so that soil excavation in elevator shaft or the well that catchments.
3. method according to claim 1, is characterized in that,
Described decorative pattern water-stopping steel template construct:
Overall decorative pattern water-stopping steel template adopts the thick checkered steel plate butt welding of 3.5mm to form, and negative and positive angular position adopts the solid limit of angle steel; For ease of lifting, decorative pattern water-stopping steel template inside adopts upper and lower two-layer angle steel to support, and lower floor is positioned at bottom checkered steel plate, and upper strata distance steel template is suitable for reading is 300mm, and suspension centre suitable for reading adopts reinforcing bar and the Plate Welding of HPB300 level diameter 20; Water-stopping steel template absolute altitude suitable for reading is higher than water level elevation, and end mouth absolute altitude is lower than the basis end below absolute altitude 700mm;
Checkered steel plate facade can plaster leveling, is convenient to waterproof coiled material construction; The common steel plate for sealing water of 300mm place welding at the bottom of distance water stopping trough.
4. method according to claim 1, is characterized in that,
Described decorative pattern water-stopping steel template hangs:
Tower crane is adopted to coordinate mobile crane to hang in foundation ditch; Before hanging, need setting-out, and need bottom steel plate for sealing water, build piled bricks by laying bricks or stones and spacer bars is set.
5. method according to claim 1, is characterized in that,
The concreting of described water stopping trough bottom land:
According to on-the-spot hydrologic regime and concrete material performance, water stopping trough bottom land concrete thickness gets 0.7m; Foul water pump is set in water stopping trough side and carries out auxiliary precipitation;
1) advance observations seawer tide situation, selects the concreting when neap;
2) consider the impact of seawater fluctuation tide, during concreting, take tremie method to assist underwater concreting, add early strength admixture to ensure concrete compaction;
3) after considering that bottom land concreting completes, easily cracking phenomena is produced under the buoyancy of seawater, then need before bottom land concreting, on bottom land concrete top, C8@100 reinforced mesh is set, and C8 100 cracking resistance reinforced mesh is set up in concrete middle part, be out of shape to prevent concrete autogenous shrinkage and form vertical through crack;
4), after considering that bottom land concreting completes, 20 × 30mm expansion sealing strip is set in bottom land concrete thickness scope pile body border;
5), after considering that bottom land concreting completes, the common steel plate for sealing water of weldering is increased in bottom land concrete middle part.
6. method according to claim 1, is characterized in that,
The concreting of described water stopping trough sidewall:
Treat bottom land concrete final set after-pouring water stopping trough sidewall concrete, in groove, Steel-pipe scaffold is set up to support before concreting, vertical rod array pitch, span 500mm, cloth is apart from 500mm, answer layering around building during concreting, lift height controls within 300mm, after the concreting of water stopping trough side completes, can transfer to foul water pump according to on-the-spot water level conditions; Ensure continuous concreting, avoid forming bubble and cold seam in concrete.
7. method according to claim 1, is characterized in that,
Described bottom land concrete picks cutter, finishing:
After the final set of water stopping trough sidewall concrete, remove groove inner support frame, after treating that support body dismounting is cleared, raggle base concrete can be picked; Need before picking cutter to release the sump position line, adopt electric pick layering to break to design elevation around sump locations of structures informant work, pick the shaping absolute altitude of cutter, water stopping trough top mark is high should consider Base isolation system bed course, waterproof and protective layer thickness thereof.
8. method according to claim 3, is characterized in that, checkered steel plate facade can be smeared ash composition and be: 1:3 cement mortar, and 15mm is thick, inside mixes 5%108 glue.
CN201510432763.8A 2015-07-22 2015-07-22 Offshore area local deep foundation pit stanching pit construction method Pending CN104975607A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105862894A (en) * 2016-04-06 2016-08-17 中国十七冶集团有限公司 Installation method for anti-floating overall template of water collection pit
CN106988317A (en) * 2017-02-28 2017-07-28 中国十七冶集团有限公司 One kind is used for underground pipe gallery method for processing foundation
CN107938681A (en) * 2017-11-26 2018-04-20 上海宝冶集团有限公司 Way after concrete sump
CN113174957A (en) * 2021-03-24 2021-07-27 上海宝冶集团有限公司 Method for clearing and excavating rain season stone space in coastal region

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Publication number Priority date Publication date Assignee Title
JPH05156635A (en) * 1991-12-09 1993-06-22 Koichi Uemura Open shield construction method and concrete caisson used therefor
CN102493487A (en) * 2011-12-13 2012-06-13 上海市第一建筑有限公司 Method for constructing foundation slab embedded with concrete supports
CN102787607A (en) * 2012-08-28 2012-11-21 大元建业集团股份有限公司 Deep foundation pit precipitation support construction method applicable to coastal region
CN102888847A (en) * 2012-10-19 2013-01-23 中国二十二冶集团有限公司 Construction method free from lowering water level for local deep foundation pit of elevator shaft
CN104652495A (en) * 2015-01-27 2015-05-27 江苏省华建建设股份有限公司 Waterproof construction process for joint of inner support upright post of foundation pit and bottom plate
CN104746520A (en) * 2015-03-03 2015-07-01 南京市测绘勘察研究院有限公司 Shallow-to-deep foundation pit supporting structure and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05156635A (en) * 1991-12-09 1993-06-22 Koichi Uemura Open shield construction method and concrete caisson used therefor
CN102493487A (en) * 2011-12-13 2012-06-13 上海市第一建筑有限公司 Method for constructing foundation slab embedded with concrete supports
CN102787607A (en) * 2012-08-28 2012-11-21 大元建业集团股份有限公司 Deep foundation pit precipitation support construction method applicable to coastal region
CN102888847A (en) * 2012-10-19 2013-01-23 中国二十二冶集团有限公司 Construction method free from lowering water level for local deep foundation pit of elevator shaft
CN104652495A (en) * 2015-01-27 2015-05-27 江苏省华建建设股份有限公司 Waterproof construction process for joint of inner support upright post of foundation pit and bottom plate
CN104746520A (en) * 2015-03-03 2015-07-01 南京市测绘勘察研究院有限公司 Shallow-to-deep foundation pit supporting structure and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105862894A (en) * 2016-04-06 2016-08-17 中国十七冶集团有限公司 Installation method for anti-floating overall template of water collection pit
CN105862894B (en) * 2016-04-06 2018-02-02 中国十七冶集团有限公司 A kind of installation method of catch pit anti-floating integral mold plate
CN106988317A (en) * 2017-02-28 2017-07-28 中国十七冶集团有限公司 One kind is used for underground pipe gallery method for processing foundation
CN107938681A (en) * 2017-11-26 2018-04-20 上海宝冶集团有限公司 Way after concrete sump
CN113174957A (en) * 2021-03-24 2021-07-27 上海宝冶集团有限公司 Method for clearing and excavating rain season stone space in coastal region

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