CN106320377B - A kind of rich water soft clay area deep basal pit covered back-digging construction method - Google Patents

A kind of rich water soft clay area deep basal pit covered back-digging construction method Download PDF

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CN106320377B
CN106320377B CN201610797321.8A CN201610797321A CN106320377B CN 106320377 B CN106320377 B CN 106320377B CN 201610797321 A CN201610797321 A CN 201610797321A CN 106320377 B CN106320377 B CN 106320377B
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minus
construction
layers
layer
support
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CN106320377A (en
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翁谢军
李文涛
王荣华
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China Railway No 2 Engineering Group Co Ltd
China Railway Erju 6th Engineering Co Ltd
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China Railway No 2 Engineering Group Co Ltd
Sixth Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • E02D29/05Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • E02D29/05Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
    • E02D29/055Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0026Metals
    • E02D2300/0029Steel; Iron

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)

Abstract

The invention discloses engineering construction technology field, rich water soft clay area deep basal pit covered back-digging construction method of the invention, including multiple steps: 1. excavation of foundation pit to minus two laminate position is poured minus two layers of underplate concrete using clay model;2. lid digs minus two layers, the earthwork of minus three layer concretes bottom plate lower position and sets up support, and bottom plate of constructing;3. removing support, construction side wall, column and top plate;4. removing first of concrete support after negative one layer side wall, strength of roof reach design requirement.This method uses lid excavation construction, bracing members frame is set up during covering and digging, construction of bottom plates and concrete casting work are carried out simultaneously, and carry out side wall, column and top board construction, solves safety issue existing in the prior art, the construction method is fast and effective, constructs especially suitable for rich water soft clay area dell.

Description

A kind of rich water soft clay area deep basal pit covered back-digging construction method
Technical field
The present invention relates to engineering construction technology field, in particular to a kind of rich water soft clay area deep basal pit covered back-digging Construction method.
Background technique
Deep-foundation pit engineering refers to that earth excavation, the dewatering project of the foundation pit (slot) of cutting depth 5m or more, excavation of foundation pit are A comprehensive engineering roadblock in foundation construction and high-rise basement construction, many problems being related in soil mechanics, simultaneously It is related to the collective effect problem of soil with supporting construction, construction method and technology are extremely important.Carrying out excavation When, open-cut and lid excavation construction are generally included, open-cut refers to first all excavating the rock of tunnel site (soil) body, so After build barrel, portal, then the construction method backfilled, lid excavation construction is after being excavated to certain depth downwards by ground, will Top closed, remaining lower part engineering is constructed under closed top cover.
When rich water soft clay area carries out deep foundation pit construction, such as fruit structure design, earth excavation machine drop level of ground water etc. It is improper to manage, it is easy to cause that the earthwork collapses and wait adverse effects, serious consequence is hardly imaginable.The prior art rich water soft clay area into When row deep foundation pit construction, have a problem in that
1, it is difficult to determine reasonable, effective construction method, leads to that there are security risks, while construction efficiency is low;
2, since rich water soft clay area includes silt clay layer and farinose argillic horizon, bearing capacity of foundation slab is low, the bottom of at Support has bad luck, sets up the job very difficults such as support when constructing on plate;
3, soil is filled in foundation pit, lifting when soil carries out cycle operation, since construction method and sequence be not right, causes to make Industry efficiency is lower.
Summary of the invention
It is an object of the invention to: overcome the prior art when rich water soft clay area carries out deep foundation pit construction due to construction party The low problem of method incomplete caused security risk and construction efficiency, provides a kind of rich water soft clay area deep basal pit lid digging Reversed construction method, this method sets up bracing members frame during covering and digging using lid excavation construction, while carrying out construction of bottom plates and mixing Solidifying soil casting work, and side wall, column and top board construction are carried out, solve safety issue existing in the prior art, this is applied Work method is fast and effective, constructs especially suitable for rich water soft clay area dell, has biggish application value.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes:
A kind of hydrous fluids soft clay area deep basal pit covered back-digging construction method sets deep basal pit as four-layer structure, wherein bearing One layer and minus two layers uses open-cut, and minus three layers and minus four layers are lid excavation construction, and ground is provided with the support of the 1st concrete, on ground Be disposed between face and negative one layer the 2nd support and the 3rd support, negative one layer and it is two layers minus between be disposed with the 4th Road support and the 5th support, covered back-digging construction includes following multiple steps:
A, when excavation of foundation pit to minus two layers of position, using clay model, minus two layers of underplate concrete, and reserved side wall construction are poured Seam;
B, after minus two layers of bottom plate reaches design strength requirement, lid digs the earthwork of minus two layers of bottom plate lower position, excavates extremely The 6th support is set up when setting Support Position, is excavated to negative Tipple Bottom Board position, and be poured negative Tipple Bottom board concrete;
C, after negative Tipple Bottom plate reaches design strength requirement, lid digs the earthwork of negative Tipple Bottom plate lower position, excavates extremely The 7th support is set up when setting Support Position, is excavated to bottom plate position, and bottom board concrete;
D, after base plate strength reaches design strength requirement, the 7th support is removed, the minus four layers of side wall of construction and minus four layers are stood Column;
E, after minus four layers of side wall intensity up to after design requirement, removing the 6th support, and it is minus three layers of side wall of constructing, three layers minus Column;
F, after minus three layers of side wall intensity reaches design requirement, the 4th and the 5th support is removed, minus two layers of side wall of constructing is born Two layers of column and negative one layer bottom plate;
G, after minus two layers of side wall, negative one layer base plate strength reach design requirement, the 2nd and the 3rd support is removed, construction is negative One layer of side wall, negative one layer column and top plate;
H, after negative one layer side wall, strength of roof reach design requirement, first of concrete support is removed.
Aforesaid way is taken, by taking above-mentioned covered back-digging construction method, i.e. erection bracing members frame during covering digging, Construction of bottom plates and concrete casting work are carried out simultaneously, and carries out side wall, column and top board construction, are solved and are deposited in the prior art Safety issue, the construction method is fast and effective, especially suitable for rich water soft clay area dell construct.
It preferably, include earthwork construction in rich water soft clay area deep basal pit covered back-digging construction method, earthwork construction includes Following steps:
I1, foundation pit is divided into four units along foundation pit length direction, including first unit, second unit, third unit and Unit the 4th, and soil outlet is set in each unit, it is included in first unit and the first soil outlet is set, in second unit setting the Two soil outlets are arranged third soil outlet in third unit, and configure crawler type grabbing arrangement, and the third soil outlet is from third list Member extends to Unit the 4th;
I2, longitudinal layered excavation, including the 9th layer, the tenth layer, eleventh floor, Floor 12, the 13rd are carried out to foundation pit Layer and the 14th layer, described 9th layer, the tenth layer and eleventh floor are located at minus two layers and minus between three layers, the Floor 12, 13rd layer and the 14th layer is located at minus three layers and minus between four layers, multiple flowing water ranges correspond to after each unit layering, including flow The 12nd range of water, the 13rd range of flowing water, the 14th range of flowing water, the 15th range of flowing water and the 16th range of flowing water;
The minus two layers of construction of bottom plates of i3, first unit is completed, and intensity carries out the 9th layer of soil by the first soil outlet up to after 90% Side is excavated, and after bracket groove is excavated in completion the 12nd range of flowing water, laterally opens up side, is set up first unit the 6th and is supported;
I4, after the completion of the minus two layers of construction of bottom plates of second unit, continue to dig bracket groove to center mileage to the second soil outlet position End is set, the first soil outlet is back to and carries out laterally opening up side, the earthwork has bad luck to the second soil outlet handling, and sets up second unit in time 6th support, the materials such as bracing members are hung in by the second soil outlet, are installed, and are carrying out the 9th layer of the 13rd model of earthwork flowing water When enclosing excavation, the tenth layer of the 13rd range earth excavation of earthwork flowing water should be carried out simultaneously;
I5, after the completion of the minus two layers of construction of bottom plates of third unit, continue to excavate bracket groove to center mileage to third soil outlet Terminate, is back to the second soil outlet and carries out laterally opening up side, the earthwork has bad luck to third soil outlet handling, and bracing members are by third soil outlet It hangs in and is installed, when carrying out the 14th range of the 9th laminar flow of water excavation, while carrying out the 14th range of the tenth laminar flow of water soil It excavates side;
I6, after the completion of the 15th range of eleventh floor flowing water and the 16th range earthwork of flowing water are excavated, carry out minus three Layer first unit construction of bottom plates, carries out lower road earth excavation after reaching 90% intensity;
I7, the tenth layer and the 13rd layer of earthwork can be excavated directly longitudinal divisions since depth of seam division is shallower.
Aforesaid way is taken, soil, lifting, when soil carries out cycle operation, due to construction method and sequence are filled in foundation pit Effective and reasonable, operating efficiency is higher.
Preferably, in the step b and step c, when the earthwork to every layer of bottom plate lower position carries out lid digging, each The underplate concrete of unit reaches earth excavation under the laggard andante of design strength, and sequence of excavation is that vertical layering from top to bottom is opened It digs, longitudinal layered formation step, laterally first digs the intermediate soil body, then dig soil at both sides.
Preferably, when constructing minus two layers of bottom plate and negative Tipple Bottom plate, the construction of concrete floor clay model is carried out, including following Aspect:
F1, middle stringer, the construction of side wall stock mould;
F2, clay model concrete construction;
F3, assembling reinforcement and casting concrete.
Since rich water soft clay area includes silt clay layer and farinose argillic horizon, bearing capacity of foundation slab is low, in bottom plate Support has bad luck, sets up the job very difficults such as support when upper construction, takes aforesaid way, is applied by carrying out against making floor clay model Work improves foundation bearing capacity, keeps concrete surface smooth.
Preferably, when carrying out erection bracing members, bracing members are set up with digging with support, and apply axial prestress, bracing members Erection should ensure that bracing members are vertical with metope, after holding out against using gad support measure fixation.
Preferably, set up bracing members when specifically includes the following steps:
J1, installation steel binder;
J2, installation bracing members,;
J3, apply prestressing force, and according to axle power monitoring data situation, it is determined whether additional prestressing.
Above-mentioned operation and step are taken, guarantees the stability of deep basal pit, since bracing members set up great timeliness, bracing members Time, position and the prestressed size of application of erection are directly related to deep basal pit and stablize.Bracing members are set up with digging with support, and are applied Add axial prestress, so that building enclosure is received reaction of bearing effect in advance, reduce the deformation of building enclosure.The erection of bracing members is answered Guarantee bracing members it is vertical with metope, after holding out against using gad support measure fixation, prevent bracing members because deformation of wall with Construction is collided and is fallen off.
Preferably, when carrying out side wall construction, following multiple steps are taken:
H1, waterproof construction is carried out to twice construction joint on plate and under plate respectively;
H2, cleaning Full-face pouring pipe, Grouting Pipe nozzle are placed in except template, and carry out binding and fixing with tied silk;
H3, side wall template is installed;
H4, concreting is carried out using steel truss formwork jumbo;
H5, it vibrates, and uses secondary vibration between new-old concrete joint face and dust inlet.
Preferably, in the step h1, construction joint carries out waterproof construction formula on to plate, using galvanized steel plain sheet waterstop, And the mode of pre-buried Full-face pouring pipe later period slip casting carries out reinforcement water-proofing treatment, construction joint position is stopped using water-swellable under plate Glue and Full-face pouring pipe combination carry out waterproof construction.
Preferably, in the step h3, when installing side wall template, template at the top of trolley is adjusted to spacious by closely connected mode The oblique mould of 30~40cm high is arranged in evolution formula on trolley punching block top, and oblique template top surface is higher by construction joint 10cm.
For pouring concrete after avoiding concrete that from can not filling up side wall and the inverse seam for doing the side wall poured under plate, take above-mentioned Mode had not only facilitated concrete to enter mould, but also can be sufficient filling with the wall top gap that concrete is generated during making firm by ramming due to slump, Guarantee that construction joint is closely knit.
Preferably, in step h4, side wall uses high fluidity pea gravel concreten, and top area uses microdilatancy coagulation Soil.This mode is taken, shrinkage of the microdilatancy compensation later period concrete of concrete in hardening process is utilized.
Compared with prior art, beneficial effects of the present invention:
1, by taking above-mentioned covered back-digging construction method, i.e., bracing members frame is set up during covering and digging, while carrying out bottom Plate construction and concrete are poured work, and carry out side wall, column and top board construction, solve safety existing in the prior art Problem, the construction method is fast and effective, constructs especially suitable for rich water soft clay area dell, has biggish popularization and application valence Value;
2, since rich water soft clay area includes silt clay layer and farinose argillic horizon, bearing capacity of foundation slab is low, the bottom of at Support has bad luck, sets up the job very difficults such as support when constructing on plate, improves ground against the construction of floor clay model is made by carrying out and holds Power is carried, keeps concrete surface smooth;
3, by setting up bracing members, guarantee the stability of deep basal pit, since bracing members set up great timeliness, bracing members frame If time, position and apply prestressed size and be directly related to deep basal pit and stablize, bracing members are set up with digging with support, and are applied Axial prestress makes building enclosure receive reaction of bearing effect in advance, reduces the deformation of building enclosure, the erection of bracing members should be protected The measure fixation that bracing members are vertical with metope, support after holding out against using gad is demonstrate,proved, prevent bracing members because of deformation of wall and is applied Work is collided and is fallen off.
Detailed description of the invention:
Structural schematic diagram when Fig. 1 is lower two layers of construction of bottom plates.
Fig. 2 be negative Tipple Bottom plate construction when structural schematic diagram.
Fig. 3 is structural schematic diagram when setting up support.
Structural schematic diagram when Fig. 4 is lower four layers of side wall and the construction of lower four layers of column.
Fig. 5 is negative the structural schematic diagram of three layers of side wall and minus three layers of column when constructing.
Fig. 6 is negative the structural schematic diagram of two layers of side wall and minus two layers of column when constructing.
Structural schematic diagram when Fig. 7 is negative one layer side wall and the construction of negative one layer column.
Fig. 8 is the structural schematic diagram for removing first of concrete.
Fig. 9 is the structural schematic diagram that lid digs section longitudinal direction excavation in layers machine slope.
Marked in the figure: the first soil outlet of 1-, the second soil outlet of 2-, 3- third soil outlet, the 12nd range of 4- flowing water, 5- stream The 13rd range of water, the 14th range of 6- flowing water, the 15th range of 7- flowing water, the 16th range of 8- flowing water, minus two layers of 9-, 11- 9th layer, the tenth layer of 12-, 13- eleventh floor, minus three layers of 14-, the minus two layers of bottom plate of 15-, the negative Tipple Bottom plate of 16-, 17- bottom plate, The minus four layers of side wall of 18-, the minus four layers of column of 19-, the minus three layers of side wall of 20-, the minus three layers of column of 21-, the minus two layers of side wall of 22-, 23- minus two Layer column, 24- negative one layer bottom plate, 25- negative one layer side wall, 26- negative one layer bottom plate, 27- top plate, first of concrete support of 28-, 29- 13rd layer, x- first unit, y- second unit, z- third unit, t- Unit the 4th.
Specific embodiment
Below with reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood It is all that this is belonged to based on the technology that the content of present invention is realized for the scope of the above subject matter of the present invention is limited to the following embodiments The range of invention.
Embodiment 1
Rich water soft clay area deep basal pit covered back-digging construction method, sets deep basal pit as four-layer structure, wherein negative one layer and Minus two layers use open-cut, and minus three layers and minus four layers are lid excavation construction, and ground is provided with the support of the 1st concrete, on ground and negative Be disposed between one layer the 2nd support and the 3rd support, negative one layer and it is two layers minus between be disposed with the 4th support With the 5th support, covered back-digging construction includes following multiple steps:
A, as shown in Figure 1, when excavation of foundation pit to minus two layers of position, using clay model, it is poured 15 concrete of minus two layers of bottom plate, and Reserved side wall construction joint;
B, as shown in Fig. 2, after minus two layers of bottom plate 15 reaches design strength requirement, lid digs 15 lower position of minus two layers of bottom plate The earthwork, excavate to setting Support Position when set up the 6th support, be excavated to negative 16 position of Tipple Bottom plate, and be poured minus three layers 16 concrete of bottom plate;
C, as shown in figure 3, after negative Tipple Bottom plate 16 reaches design strength requirement, lid digs negative 16 lower position of Tipple Bottom plate The earthwork, excavate to setting Support Position when set up the 7th support, be excavated to 17 position of bottom plate, and 17 concrete of bottom board;
D, as shown in figure 4, after 17 intensity of bottom plate reaches design strength requirement, the 7th support is removed, minus four layers of side wall of constructing 18 and minus four layers of column 19;
E, as shown in figure 5, after 18 intensity of minus four layers of side wall reaches design requirement, the 6th support is removed, and construct minus three layers Side wall 20, minus three layers of column 21;
F, as shown in fig. 6, after minus three layers of side wall intensity reaches design requirement, the 4th and the 5th support is removed, construction is negative Two layers of side wall 22, minus two layers of column 23 and negative one layer bottom plate 24;
G, as shown in fig. 7, after minus two layers of side wall 22,24 intensity of negative one layer bottom plate up to after design requirement, removing the 2nd and the 3 supports, construction negative one layer side wall 25, negative one layer column 26 and top plate 27;
H, as shown in figure 8, after after negative one layer side wall 25,27 intensity of top plate reach design requirement, first of concrete branch is removed Support 28.
Aforesaid way is taken, by taking above-mentioned covered back-digging construction method, i.e. erection bracing members frame during covering digging, Construction of bottom plates and concrete casting work are carried out simultaneously, and carries out side wall, column and top board construction, are solved and are deposited in the prior art Safety issue, the construction method is fast and effective, especially suitable for rich water soft clay area dell construct.
In covered back-digging work progress, carries out the inverse floor clay model that does and construct.
Minus two layers of bottom plate, negative Tipple Bottom plate are located at silt clay layer, farinose argillic horizon, and bearing capacity of foundation slab is low, minimum Only 65KPa, though take high-pressure rotary jet grouting pile to be reinforced in design, since reinforcement depth is deeper, most as deep as arrive 26.7m, and For the weak reinforcing of 3m stripping, foundation bearing capacity is not still high.If meeting the rainy day, excavator walks back and forth and is supported down in addition Fortune is set up, and substrate soil is even more a piece of miriness, and personnel's walking is all very painstaking.Therefore consider that one layer of bamboo plate+20cmC20 element is mixed Solidifying soil+separation layer (PVC board or epoxy glass fabric are laminated insulation board) is used as clay model layer.Construction content include:
(1) stringer, the construction of side wall stock mould in
Minus two layers, it is three layers minus in stringer and abutment wall use the brick stock mould at 24cm thickness, the cement sand plaster of 5cm.For Guarantee the line style and structure size of middle stringer after demoulding, stock mould must be longitudinal straight, and vertical vertical, headroom size, which has to comply with, to be set Meter requires.
(2) clay model concrete construction
Clay model concrete is the C20 concrete of 20cm, and top of concrete absolute altitude improves 2cm than structural slab bottom absolute altitude, as The anticipated settlement of top board structure.To guarantee that concrete surface is smooth, no concave-convex injustice phenomenon, each unit clay model concrete is pressed Lateral framing construction carries out absolute altitude control in the channel steel of every width two sides setting 15cm, after concrete construction, uses aluminium alloy level It strikes off, press polish plastering is carried out before concrete initial set.For avoid carry out it is inverse make earth excavation under plate when, blinding concrete is in blocks It falls and mechanical, personnel is damaged.
To guarantee that clay model smoothly demoulds, separation layer (PVC board or epoxy glass fabric lamination insulation are set on concrete cushion Plate).
(3) reinforcing bar binding and concreting
Reinforcing bar former material steel bar meter field on foundation pit processes, and semi-finished product hang in foundation pit, this engineering steel using truck crane Muscle connection is using two kinds of forms of the thread rolling bar connection and welding.
Because inwall, frame column lid are dug along doing, in the binding of plate (beam) reinforcing bar, it is necessary to by the pre-buried upper and lower level of design requirement Chemise and frame column reinforcing bar connector, when embedded ribs are installed, main reinforcement exposed length should be lower than oblique construction joint lowest part under plate 1.5m, reserved steel bar length is the above 1.5m at plate or back on plate, connecing when column of constructing after guarantee is connected with side wall main reinforcement Head is staggered length.Plate lower contact, which is taken, need to carry out effective protection to steel bar head when mechanical connection, prevent from not carrying out after excavating Effectively connection.
Earthwork construction the following steps are included:
(1) soil outlet is arranged
Consider effective use this engineering structure reserving hole, along foundation pit direction be staggered 10 be unearthed, feed openings.
(2) device configuration
Two 10T gantry cranes and a 50T crawler type grab bucket are configured, crawler type grab bucket in shield Jing Chu for being unearthed and in advance It is unearthed when staying soil outlet by ground-connecting-wall side;Gantry crane is carried out unearthed using the stair hole reserved on floor.Grab bucket is equipped with two PC120 digging machine, every gantry crane are equipped with two PC120 digging machines.
(3) earth excavation
Every unit is inverse reach as board concrete design strength 90% after, the earthwork is according to " vertical layered, Zong Xiangfen under plate The principle of section, intermediate kerve, two sides extension, pretensioned girder ", vertically stage excavation, longitudinal layered formation step are horizontal from top to bottom The soil body among first digging, then dig soil at both sides.
The every layer of earthwork of each step is excavated by the sequence of " first extending after intermediate grooving to two sides ", i.e., from the east head to The excavated surface of western end well longitudinally draws slope to excavate bracket groove along foundation pit, and middle groove width first has to meet excavator revolution spoir It is required that while guaranteeing to stay soil at both sides again as far as possible more.Bracket groove is excavated by 5m, two sides earthwork balance, symmetrical progress It excavates.Two sides slope ratio of slope 1:2.5.After intermediate kerve is excavated to the distance of 3~4 bracing members, spread from centre to both sides It digs, the excavation of soil at both sides should be balanced, symmetrically be carried out.
As shown in figure 9, in the deep basal pit covered back-digging construction method of rich water soft clay area earthwork construction specific steps are as follows:
I1, foundation pit is divided into four units, including first unit x, second unit y, third unit z along foundation pit length direction With the 4th unit t, and each unit be arranged soil outlet, be included in first unit x be arranged the first soil outlet 1, in second unit y Second soil outlet 2 is set, third soil outlet 3 is set in third unit z, and configure crawler type grabbing arrangement, the third is unearthed Mouth 3 extends to the 4th unit t from third unit z;
I2, carry out longitudinal layered excavation to foundation pit, including the 9th layer 11, the tenth layer 12, eleventh floor 13, Floor 12, 13rd layer and the 14th layer (not identifying in figure), described 9th layer 11, the tenth layer 12 and eleventh floor 13 are located at minus two layer 9 With minus three layers between 14, the Floor 12, the 13rd layer and the 14th layer are located at minus three layer 14 and minus between four layers, each unit Multiple flowing water ranges, including the 12nd range 4 of flowing water, the 13rd range 5 of flowing water, the 14th range 6 of flowing water, stream are corresponded to after layering The 15th range 7 of water and the 16th range 8 of flowing water;
The minus two layers of construction of bottom plates of i3, first unit x is completed, and intensity carries out the 9th layer 11 by the first soil outlet 1 up to after 90% Earth excavation is completed laterally to open up side, set up bracing members, be first unit the 6th after bracket groove is excavated in the 12nd range 4 of flowing water Support;
I4, after the completion of minus two layer of 9 construction of bottom plates of second unit y, continue to dig bracket groove to center mileage to the second soil outlet 2 Position terminates, and is back to the first soil outlet 1 and carries out laterally opening up side, the earthwork has bad luck to 2 handling of the second soil outlet, and sets up steel branch in time Support, the materials such as bracing members are hung in by the second soil outlet 2, are installed, and are opened carrying out the 9th layer of 11 cubic metres of earth of the 13rd range 5 of flowing water When digging, the tenth layer of 12 cubic metres of earth of 5 earth excavation of the 13rd range of flowing water should be carried out simultaneously;
I5, after the completion of minus two layer of 9 construction of bottom plates of third unit z, continue to center mileage excavate bracket groove to third be unearthed Mouth 3 terminates, and is back to the second soil outlet 2 and carries out laterally opening up side, the earthwork has bad luck to 3 handling of third soil outlet, and bracing members are by third Soil outlet 3, which is hung in, to be installed, and when carrying out the 9th layer of the 14th range 6 of 11 flowing water excavation, while carrying out the tenth layer of 12 flowing water 14th range, 6 earth excavation;
I6, after the completion of 8 cubic metres of earth of the 15th range 7 of 13 flowing water of eleventh floor and the 16th range of flowing water are excavated, carry out Minus three layer of 14 first unit a construction of bottom plates carries out lower road earth excavation after reaching 90% intensity;
I7, the tenth layer 12, the 13rd layers 29 cubic metres of earth due to depth of seam division it is shallower can directly longitudinal divisions excavate.
Above-mentioned steps and method are taken, the observation of part on the spot is dug to lid, soil is filled in foundation pit, lifting is native, to again Foundation pit is arrived down, since construction method and sequence are effective and reasonable, operating efficiency is higher, completes this about 8 minutes used time of circulation and (rises Height 24m~42m drops), 16 hours daily working times, amount of being unearthed daily about 150m3 or so completes one using crawler type grab bucket It a circulation time about 5 minutes, works daily the identical time, for amount of being unearthed daily about in 260m3 or so, efficiency is much higher than gantry It when hanging, therefore being related to lid excavation construction, pays the utmost attention to carry out using grab bucket unearthed, needs on floor end bay every certain reserved Soil outlet.
Embodiment 2
The present embodiment is applied to bracing members and sets up, in demolishing process.
Bracing members, which are set up, excavates the twice critical process that be deep foundation pit construction inseparable, bracing members erection with pit earthwork Great timeliness, time, position and the prestressed size of application that bracing members are set up are directly related to deep basal pit and stablize.Bracing members It sets up with digging with support, and applies axial prestress, so that building enclosure is received reaction of bearing effect in advance, reduce the change of building enclosure Shape.The erection of bracing members should ensure that bracing members are vertical with metope.Using the measure fixation of gad support after holding out against, steel is prevented Support falls off because of deformation of wall and construction collision.Set up bracing members when specifically includes the following steps:
J1, installation steel binder dig out the pre-buried steel on diaphram wall after soil layer is excavated to support erection design position Plate welds pallet, installs steel binder;
J2, installation bracing members, bracing members are outside foundation pit according to the width of foundation pit, the length of ground-connecting-wall to steel binder, steel system Length between beam has spelled tube coupling.Bracing members tube coupling is hung with crane into foundation pit by soil outlet first, it then will by digging machine Bracing members are transported to installation site.Fixing end is first set up, bracing members are lifted by two digging machines, bracing members one end is held on On the welded angle iron of pre-embedded steel slab, the other end is shelved on steel binder.Continue to set up the second section, be lifted still through digging machine, it will Second section one end is connect with first segment by high-strength bolt, and the other end is shelved on another steel binder.Finally set up fixing end Bracing members are obtained, first pull out segmented head telescopable portion, third section one end and the second section are first passed through high-strength bolt by digging machine lifting The other end is stably placed on preparatory mounted triangular steel plate by Lian Hao.Pre-embedded steel slab is withstood into movable head pull-out;
J3, prestress application is carried out, and according to axle power monitoring data situation, it is determined whether additional prestressing, it is hydraulic by 2 Jack (according to brace pre axial force size 300T, 500T) is played with digging machine is put into segmented head press position, and pays attention to keeping very heavy It walks unanimously top row.Connect oil pipe after can turn on pump apply prestressing force, prestress application in place after, in segmented head wedge slot gad plug Tightly, then jack is unclamped in oil return, unlocks hoisting wirerope, completes the installation of this root support.It should be taken into account when construction prestressing force Stress loss when operation, construction prestress value should be than designing axle power increase about 10%, and makes a record.
After support applies prestressing force, the anchor ear reinforcing bar of " u "-shaped is close to bracing members, and be securely welded on steel binder On, two pieces of bolts are filled in the gap of support Yu steel binder, prevent bracing members from being moved left and right by external force.
Axial force of the supports is added with based on axle power monitoring data, supplemented by manual inspection.Axle power monitoring is measurement axle power variation, If axle power value reduces, it should be added with prestressing force in time.Manual inspection be check support segmented head gag, depending on its loosening whether determine be It is no to be added with.
Embodiment 3
The present embodiment is constructed applied to side wall, when carrying out side wall construction, comprising the following steps:
H1, waterproof construction is carried out to twice construction joint on plate and under plate respectively;
H2, cleaning Full-face pouring pipe, Grouting Pipe nozzle are placed in except template, and carry out binding and fixing with tied silk;
H3, side wall template is installed;
H4, concreting is carried out using steel truss formwork jumbo;
H5, it vibrates, and uses secondary vibration between new-old concrete joint face and dust inlet.
Concrete operations are as follows:
(1) waterproof construction
According to covered back-digging technological characteristics of construction, ground-connecting-wall is overlapping wall, and there are plate in every layer of side wall and bottom plate, middle plate joint Twice construction joint under upper, plate, it is therefore necessary to attach great importance to the waterproof quality of construction joint.
Ground-connecting-wall and liner wall construction junction position carry out brushing cement based penetration crystallization type water proofing paint after dabbing processing, The anti-permeability performance that water reverse osmosis effect improves concrete is met using it.Construction joint position uses galvanized steel plain sheet waterstop on plate, And the mode of pre-buried Full-face pouring pipe later period slip casting carries out reinforcement water-proofing treatment.Construction joint position is stopped using water-swellable under plate Glue and Full-face pouring pipe combination carry out waterproof construction, and water-swellable water-stop glue is pasted onto construction seam surface after squeezing out, Cross dimensions after curing molding is (8-10) mm × (18-20) mm.Galvanized steel plain sheet sealing bandwidth in construction joint position on plate For 300mm, thickness 4mm, galvanized layer thickness is greater than 30 microns, and construction joint should be located at steel plate middle when steel plate is installed, and connector is adopted It is docked with welding, it is desirable that steel plate axis is overlapped, and is docked secured, closely knit, waterproof.
Before side wall reinforcement construction, first to construction joint carries out dabbing processing on plate, under plate, it is floating to cut concrete surface Slurry.Dress watch is carried out to steel plate water stopper pre-buried on plate, guarantees that the height that waterstop exposes is the 1/2 of waterstop height, Part concrete is dug out to the inadequate position of proud exposure, guarantees the proud exposure of steel plate water stopper, to guarantee construction construction The position of seam substantially in the half height and position of waterstop, guarantees the effect of sealing.To on the plate cut, concrete laitance under plate It must clean out, construction joint is rinsed with giant, guarantee construction joint position without residue.
(2) concreting is carried out using steel truss formwork jumbo
The advantages of mobile motor driven walking type steel truss template abutment wall trolley of producer's production: formwork rigidity is big, anti- Deformability is strong, spells assembly and disassembly without repetition, is mobile in place fast, and short construction period (3~4 days one cycles), every mould pours Length 12m.After reaching certain intensity after side wall concrete pours, the adjustable bolt of support shuttering rod piece, template are unclamped After face is entirely detached from concrete surface, start two motors on trolley, driving trolley traveling in orbit to next construction cell It constructs.
(3) concrete construction
Full-face pouring pipe is cleared up before casting concrete, and Grouting Pipe nozzle is placed in except template, and is carried out with tied silk Binding and fixing avoid pouring Grouting Pipe nozzle inside side wall in casting process.When installing side wall template, to avoid coagulation Soil can not fill up pouring concrete and the inverse seam for doing the side wall poured under plate after side wall, by template at the top of trolley by closely connected mode tune Whole is mode of opening wide, and the oblique mould of 30~40cm high is arranged on trolley punching block top, oblique template top surface is higher by construction joint 10cm.This Sample had not only facilitated concrete to enter mould, but also can be sufficient filling with the wall top gap that concrete is generated during making firm by ramming due to slump, protected It is closely knit to demonstrate,prove construction joint.Side wall uses high fluidity pea gravel concreten, and top area utilizes concrete using slightly expanded concrete Microdilatancy compensates shrinkage of the later period concrete in hardening process.In addition to routinely vibrating, in new-old concrete joint face under Secondary vibration is used between grey mouth.It cuts for convenience, because the side wall wedge shape coagulation local product for being tiltedly molded as more pouring is at the beginning of concrete It cuts, and is modified immediately after solidifying.

Claims (9)

1. a kind of rich water soft clay area deep basal pit covered back-digging construction method, which is characterized in that set deep basal pit as four-layer structure, Wherein negative one layer and minus two layers use open-cut, and minus three layers and minus four layers are lid excavation construction, and each layer sets up bracing members, ground Face be provided with the 1st concrete support, be disposed between ground and negative one layer the 2nd support and the 3rd support, negative one layer and The 4th support and the 5th support are disposed between minus two layers, covered back-digging construction includes following multiple steps:
A, when excavation of foundation pit to minus two layers of position, using clay model, minus two layers of underplate concrete, and reserved side wall construction joint are poured;
B, after minus two layers of bottom plate reaches design strength requirement, lid digs the earthwork of minus two layers of bottom plate lower position, excavates to setting The 6th support is set up when Support Position, is excavated to negative Tipple Bottom Board position, and be poured negative Tipple Bottom board concrete;
C, after negative Tipple Bottom plate reaches design strength requirement, lid digs the earthwork of negative Tipple Bottom plate lower position, excavates to setting The 7th support is set up when Support Position, is excavated to bottom plate position, and bottom board concrete;
D, after base plate strength reaches design strength requirement, the 7th support is removed, construct minus four layers of side wall and minus four layers of column;
E, after minus four layers of side wall intensity reaches design requirement, the 6th support, and minus three layers of side wall of constructing, minus three layers of column are removed;
F, minus two layers of side wall of constructing, two layers minus after minus three layers of side wall intensity up to after design requirement, removing the 4th and the 5th support Column and negative one layer bottom plate;
G, after minus two layers of side wall, negative one layer base plate strength reach design requirement, the 2nd and the 3rd support is removed, negative one layer of constructing Side wall, negative one layer column and top plate;
H, after negative one layer side wall, strength of roof reach design requirement, first of concrete support is removed;
When the earthwork to every layer of bottom plate lower position carries out lid digging, after the underplate concrete of each unit reaches design strength Earth excavation under plate is carried out, sequence of excavation is vertical stage excavation from top to bottom, and longitudinal layered formation step is laterally first dug intermediate The soil body, then dig soil at both sides.
2. deep basal pit covered back-digging construction method in rich water soft clay area according to claim 1, which is characterized in that carrying out When earthwork lid excavation construction, earthwork lid excavation construction includes the following steps:
I1, foundation pit is divided into four units, including first unit, second unit, third unit and the 4th along foundation pit length direction Unit, and soil outlet is set in each unit, it is included in first unit and the first soil outlet is set, goes out in second unit setting second Tu Kou is arranged third soil outlet in third unit, and configures crawler type grabbing arrangement, and the third soil outlet prolongs from third unit Extend to Unit the 4th;
I2, carry out longitudinal layered excavation to foundation pit, including the 9th layer, the tenth layer, eleventh floor, Floor 12, the 13rd layer and 14th layer, described 9th layer, the tenth layer and eleventh floor are located at minus two layers and minus between three layers, the Floor 12, the tenth Three layers and the 14th layer are located at minus three layers and minus between four layers, correspond to multiple flowing water ranges after each unit layering, including flowing water the 12 ranges, the 13rd range of flowing water, the 14th range of flowing water, the 15th range of flowing water and the 16th range of flowing water;
The minus two layers of construction of bottom plates of i3, first unit is completed, and intensity carries out the 9th layer of earthwork by the first soil outlet and open up to after 90% It digs, after bracket groove is excavated in completion the 12nd range of flowing water, laterally opens up side, set up first unit the 6th and support;
I4, after the completion of the minus two layers of construction of bottom plates of second unit, continue to center mileage dig bracket groove to the second soil outlet position tie Beam is back to the first soil outlet and carries out laterally opening up side, and the earthwork has bad luck to the second soil outlet handling, and sets up second unit the 6th in time Road support, bracing members material are hung in by the second soil outlet, are installed, and are excavated carrying out the 9th layer of the 13rd range of earthwork flowing water When, the tenth layer of the 13rd range earth excavation of earthwork flowing water should be carried out simultaneously;
I5, after the completion of the minus two layers of construction of bottom plates of third unit, continue to center mileage excavate bracket groove to third soil outlet terminate, It is back to the second soil outlet to carry out laterally opening up side, the earthwork has bad luck to third soil outlet handling, and bracing members are hung in by third soil outlet It is installed, when carrying out the 14th range of the 9th laminar flow of water excavation, while carrying out the 14th range earthwork of the tenth laminar flow of water and opening It digs;
I6, after the completion of the 15th range of eleventh floor flowing water and the 16th range earthwork of flowing water are excavated, carry out minus three layer The construction of one unit baseboard, carries out lower road earth excavation after reaching 90% intensity;
I7, the tenth layer and the 13rd layer of earthwork can be excavated directly longitudinal divisions since depth of seam division is shallower.
3. deep basal pit covered back-digging construction method in rich water soft clay area according to claim 2, which is characterized in that constructing When minus two layers of bottom plate and negative Tipple Bottom plate, the construction of concrete floor clay model, including following aspect are carried out:
F1, middle stringer, the construction of side wall stock mould;
F2, clay model concrete construction;
F3, assembling reinforcement and casting concrete.
4. deep basal pit covered back-digging construction method in rich water soft clay area according to claim 1, which is characterized in that carrying out When setting up bracing members, bracing members are set up with digging with support, and apply axial prestress, and the erection of bracing members should ensure that bracing members and wall Face is vertical, using the measure fixation of gad support after holding out against.
5. deep basal pit covered back-digging construction method in rich water soft clay area according to claim 4, which is characterized in that set up steel When support specifically includes the following steps:
J1, installation steel binder;
J2, installation bracing members;
J3, apply prestressing force, and according to axle power monitoring data situation, it is determined whether additional prestressing.
6. deep basal pit covered back-digging construction method in rich water soft clay area described in one of -5 according to claim 1, which is characterized in that When carrying out side wall construction, following multiple steps are taken:
H1, waterproof construction is carried out to twice construction joint on plate and under plate respectively;
H2, cleaning Full-face pouring pipe, Grouting Pipe nozzle are placed in except template, and carry out binding and fixing with tied silk;
H3, side wall template is installed;
H4, concreting is carried out using steel truss formwork jumbo;
H5, it vibrates, and uses secondary vibration between new-old concrete joint face and dust inlet.
7. deep basal pit covered back-digging construction method in rich water soft clay area according to claim 6, which is characterized in that the step In rapid h1, when construction joint on to plate carries out waterproof construction, using galvanized steel plain sheet waterstop, and the pre-buried Full-face pouring pipe later period The mode of slip casting carries out reinforcement water-proofing treatment, and construction joint position is using water-swellable water-stop glue in conjunction with Full-face pouring pipe under plate Mode carries out waterproof construction.
8. deep basal pit covered back-digging construction method in rich water soft clay area according to claim 7, which is characterized in that the step In rapid h3, when installing side wall template, template at the top of trolley is adjusted to open wide mode by closely connected mode, on trolley punching block top The oblique mould of 30~40cm high is set, and oblique template top surface is higher by construction joint 10cm.
9. deep basal pit covered back-digging construction method in rich water soft clay area according to claim 7, which is characterized in that in step In h4, side wall uses high fluidity pea gravel concreten, and top area uses slightly expanded concrete.
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