CN110344394A - A kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction and construction method - Google Patents
A kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction and construction method Download PDFInfo
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- CN110344394A CN110344394A CN201910547691.XA CN201910547691A CN110344394A CN 110344394 A CN110344394 A CN 110344394A CN 201910547691 A CN201910547691 A CN 201910547691A CN 110344394 A CN110344394 A CN 110344394A
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- 238000010276 construction Methods 0.000 title claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 145
- 239000010959 steel Substances 0.000 claims abstract description 145
- 238000007569 slipcasting Methods 0.000 claims abstract description 57
- 230000002787 reinforcement Effects 0.000 claims abstract description 32
- 238000009412 basement excavation Methods 0.000 claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims abstract description 6
- 238000012423 maintenance Methods 0.000 claims abstract description 5
- 238000005728 strengthening Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 3
- 241001149930 Protura <class> Species 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000003651 drinking water Substances 0.000 claims description 3
- 235000020188 drinking water Nutrition 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 230000002262 irrigation Effects 0.000 claims description 3
- 238000003973 irrigation Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 235000011194 food seasoning agent Nutrition 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 238000007596 consolidation process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 238000009432 framing Methods 0.000 abstract description 2
- 230000015271 coagulation Effects 0.000 abstract 1
- 238000005345 coagulation Methods 0.000 abstract 1
- 210000002435 tendon Anatomy 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction and construction methods, including antidumping plate, slip casting steel pipe, fixation steel plate, the antidumping plate by framework of steel reinforcement and pour coagulation local soil type in existing basic surrounding at, slip casting steel pipe links together after being fixed along existing basic surrounding quincuncial arrangement and by fixation steel plate with antidumping slab tendons skeleton, its construction procedure is that preparation of construction → injected hole is drilled with → mud jacking → excavation of foundation pit → tie with reinforcing bar and fixation steel plate welding → concreting and maintenance, by setting slip casting steel pipe grouting and reinforcing ground in existing basic surrounding, then slip casting steel pipe is fixed in antidumping plate main reinforcement by strengthening steel slab, finally pour antidumping board concrete, form one " pile framing ", can the effective solution existing based process time it is long, consolidation effect is unknown The problems such as aobvious, ensure that and expand existing foundation bearing capacity and its stability, while having the characteristics that speed of application is fast, good in economic efficiency.
Description
Technical field
The invention belongs to architectural engineering ground base enforcement technical field of construction, and in particular to a kind of surrounding deep foundation pit shallow embedding
Structure base ruggedized construction is mainly used in the reinforcing of surrounding deep foundation pit shallow embedding structure base, guarantees existing shallow embedding structures
Safety, also relates to the construction method of surrounding deep foundation pit shallow embedding structure base ruggedized construction.
Background technique
With the development of urbanization, engineering construction place surrounding enviroment become increasingly complex, can not in Deep Excavation
The meeting avoided generates disturbance to existing stratum, so as to cause foundation pit deformation and the land movement of foundation pit periphery, pacifies to surrounding building
It impacts entirely, especially the important structure building in foundation pit periphery, it is extremely harsh to ground stability requirement, such as take no action to
It is reinforced, once it is more than allowed band that foundation pit deformation, which occurs, during foundation pit construction, easily structures is caused to sink
It drops or topples, cause extremely severe social influence and irremediable economic loss.
It for the structures of surrounding deep foundation pit, generally takes to move and changes or grouting and reinforcing reduces construction risk: being changed using moving
When mode, need to be reported to the higher authorities at different levels for approval, existing buildings remove, new construction of structures construction etc. programs, process is longer and uncontrollable, work
Phase risk of time delay is larger；When using grouting and reinforcing mode, the structures periphery soil body can only be reinforced, it can not be to structures base
The soil body is effectively reinforced below plinth, and consolidation effect is unobvious.It therefore, is reduction surrounding deep foundation pit structures in digging process
Security risk, to cut feasible surrounding deep foundation pit structures shallow foundation reinforcement technique particularly important for research and grasp.
Summary of the invention
The first purpose of this invention be to provide a kind of structure it is simple, it is easy for construction, to existing shallow foundation structures shadow
Ring small, the good surrounding deep foundation pit shallow embedding structure base ruggedized construction of consolidation effect.
The first purpose of this invention is realized by technical measures below: a kind of surrounding deep foundation pit shallow embedding structures base
Plinth ruggedized construction, it is described including fixation steel plate, slip casting steel pipe and the antidumping plate set gradually outward along existing basic outer
Antidumping plate includes framework of steel reinforcement and pours in the concrete of existing basic surrounding, the fixation steel plate be square be set to it is existing
Fundamental external is simultaneously located in the concrete poured, and the fixation steel plate is equipped with according to slip casting steel pipe position reserving hole,
The slip casting steel pipe is circumferentially disposed along existing basic surrounding, and arrangement quantity is no less than 2 rings, and adjacent 2 ring slip casting steel pipe is in quincunx
Interlaced arrangement, same ring slip casting steel pipe tail end pass through fixation steel plate reserving hole and are welded and fixed together with fixation steel plate.
As an improvement, the framework of steel reinforcement is double layer bar, the framework of steel reinforcement and existing basis use the side of bar planting
Formula is attached.
As an improvement, the conehead that slip casting steel pipe front end is equipped with, tail end is equipped with only slurry section, between middle section is equipped with equidistantly
Every the extravasating hole of setting.
As an improvement, the degree of the conehead is not less than 10cm, the length of the only slurry section is not less than 1.5m, the extravasating hole
Spacing be 15cm, the extravasating hole is in quincuncial arrangement and aperture is 10~16mm.
As an improvement, slip casting steel pipe is connected into an entirety by the fixation steel plate, and it is welded and fixed securely with framework of steel reinforcement,
The fixation steel plate includes first layer fixation steel plate, second layer fixation steel plate, the fixed steel of the first layer fixation steel plate, the second layer
Plate is located at the over and under of framework of steel reinforcement.
As an improvement, the fixation steel plate is made by 1cm steel plate, the fixation steel plate width is slip casting diameter of steel tube
3 times.
As an improvement, the fixation steel plate along it is existing basis outward setting there are two.
As an improvement, its construction method, feature comprise the steps of:
Step 1: preparation of construction
Field investigation is organized, it is comprehensive to the existing basal perimeter line conditions progress of quasi- reinforcing to sound out the people in a given scope one by one in order to break a criminal case, verify underground utilities
Position；Carry out levelling of the land and people, machine, material preparation.
Step 2: injected hole is drilled with
Strengthening of foundation range is 3~5 times of existing foundation widths, injected hole along the existing basic double quincuncial arrangement of surrounding,
Pitch-row 1.3m × 1.3m, interior row's injected hole are not less than 1m away from existing basis outside spacing；Slip casting bore dia is than slip casting diameter of steel tube
Big 5~10mm, hole depth is according to 10m and enters rock stratum not less than 2m dual control, and slip casting steel pipe top absolute altitude and the structures reinforced were both
There is basic top surface absolute altitude identical, error must not exceed ± 50mm to injected hole hole location in length and breadth, and verticality allowable error is not to be exceeded
3 ‰, sediment thickness is not more than 50mm after borehole cleaning.
Step 3: mud jacking
1 slip casting of slip casting steel pipe uses M30 cement grout, and the ratio of mud is generally 0.5~1 (being determined by grouting test),
And appropriate retarder is mixed, cement uses P.O.42.5 ordinary portland cement, and mixing water uses drinking water；Using mudjack into
Row mud jacking uses underflow sealing of hole at the end of mud jacking, and controlled grouting pressure is in 0.2~0.5MPa or so.
Step 4: excavation of foundation pit
The existing basal perimeter earthwork of the structures that need to be reinforced is excavated using excavator, excavates gradient 1:1.5, is excavated
0.5~1.0m of depth, nearby the 10cm soil body uses people using artificial clear bottom to excavation of foundation pit line 301 within the scope of the 50cm of basis
Work is excavated, and when excavation should be noted the protection reinforced to slip casting steel pipe, is avoided slip casting steel pipe and is fractureed, is damaged.
Step 5: tie with reinforcing bar and fixation steel plate welding
To structures existing surface of base chisel face gently hammer into shape, dabbing, and clean out existing surface of base discrete particles and
Dross dust sets bar planting hole according to the position of framework of steel reinforcement on the basis of existing；First layer fixation steel plate is penetrated into slip casting steel
It manages and is welded and fixed, start tie with reinforcing bar, second layer fixation steel plate is penetrated after the completion of tie with reinforcing bar, will and will fix
Steel plate carries out two-sided be fully welded with framework of steel reinforcement contact site and connect.
Step 6: concreting and maintenance
Template installation is carried out and on existing basis in antidumping plate contact position brushing interfacial agents according to antidumping board size
It is handled, then carries out antidumping board concrete and pour；After concreting, watering should be covered in 12h under normal temperature conditions
Maintenance, for irrigation times to keep concrete is wet to be advisable, curing time is no less than sennight.
Compared with prior art, the present invention has the advantage that
(1) by the existing ground of slip casting steel pipe grouting and reinforcing, while slip casting steel pipe and antidumping plate have been integrally formed one
" pile framing ", is effectively increased the bearing capacity and stability on existing basis, and consolidation effect is good.
(2) construction technology of the present invention is simpler, and avoidable existing buildings, which move, changes brought relevant issues, speed of application
Fastly, high-efficient.
(3) present invention carries out original place reinforcing to foundation pit periphery structure base, and the resources such as machinery, the material of investment are less,
Compared with structures move and change, without removing and creating, operating expenses is reduced obviously, and economic benefit is good.
Detailed description of the invention
Fig. 1 is that the slip casting steel pipe of a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction and construction method of the invention shows
It is intended to.
Fig. 2 is that the slip casting steel pipe of a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction and construction method of the invention is flat
Face arrangement schematic diagram.
Fig. 3 is that the excavation of foundation pit of a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction and construction method of the invention cuts open
Face schematic diagram.
Fig. 4 be a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction of the present invention and construction method framework of steel reinforcement with
Fixation steel plate connects floor map.
Fig. 5 be a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction of the present invention and construction method framework of steel reinforcement with
Fixation steel plate connects diagrammatic cross-section.
Fig. 6 is that the reinforcing of a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction and construction method of the invention is integrally cutd open
Face schematic diagram.
Appended drawing reference: 1, slip casting steel pipe, 101, conehead, 102, only slurry section, 103, extravasating hole, 2, fixation steel plate, 201, the
One layer of fixation steel plate, 202, second layer fixation steel plate, 3, antidumping plate, 301, excavation of foundation pit line, 302, framework of steel reinforcement, 4, existing
Basis.
Specific embodiment
For a better understanding of the technical solution of the present invention, below with reference to embodiment attached drawing to the present invention further specifically
It is bright.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not intended to limit the present invention.
A kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction, it is characterised in that: including along existing basic 4 outer to
Fixation steel plate 2, slip casting steel pipe 1 and the antidumping plate 3 set gradually outside, the antidumping plate 3 include framework of steel reinforcement 302 and pour
It builds in the concrete of existing basic 4 surrounding, the fixation steel plate 2 is square to be set to existing basic 4 outside and be located at and pour
In concrete, the fixation steel plate 2 is equipped with according to 1 position reserving hole of slip casting steel pipe, and the slip casting steel pipe (1) was along both
There is basic (4) surrounding circumferentially disposed, arrangement quantity is no less than 2 rings, and adjacent 2 ring slip casting steel pipe (1) is in quincunx interlaced arrangement, together
One ring slip casting steel pipe (1) tail end passes through fixation steel plate (2) reserving hole and is welded and fixed together with fixation steel plate (2).
As the present embodiment better embodiment, the framework of steel reinforcement 302 is double layer bar, the framework of steel reinforcement
302 are attached by the way of bar planting with existing basic 4.
As the present embodiment better embodiment, the conehead 101 that 1 front end of slip casting steel pipe is equipped with, tail end is equipped with
Section 102 is only starched, middle section is equipped with the extravasating hole 103 of equidistant interval setting.
As the present embodiment better embodiment, the degree of the conehead 101 is not less than 10cm, the only slurry section 102
Length be not less than 1.5m, the spacing of the extravasating hole 103 is 15cm, and the extravasating hole 103 is in quincuncial arrangement and aperture
10~16mm.
As the present embodiment better embodiment, the fixation steel plate 2 slip casting steel pipe 1 is connected it is integral, and
It is welded and fixed securely with framework of steel reinforcement 302, the fixation steel plate 2 includes first layer fixation steel plate 201, second layer fixation steel plate
202, the first layer fixation steel plate 201, second layer fixation steel plate 202 are located at the over and under of framework of steel reinforcement 302.
As the present embodiment better embodiment, the fixation steel plate 2 is made by 1cm steel plate, the fixation
2 width of steel plate is about 3 times of 1 diameter of slip casting steel pipe.
A kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction construction method, feature comprise the steps of:
Step 1: preparation of construction
Field investigation is organized, it is comprehensive to the existing basic 4 periphery line conditions progress of quasi- reinforcing to sound out the people in a given scope one by one in order to break a criminal case, verify underground utilities
Position；Carry out levelling of the land and people, machine, material preparation.
Step 2: injected hole is drilled with
Strengthening of foundation range is 3~5 times of existing basic 4 width, and injected hole is along the existing basic double quincunx cloth of 4 surrounding
It sets, pitch-row 1.3m × 1.3m, interior row's injected hole is not less than 1m away from existing basic 4 outside spacing；Slip casting bore dia is than slip casting steel pipe 1
Big 5~the 10mm of diameter, hole depth is according to 10m and enters rock stratum not less than 2m dual control, and 1 top mark height of slip casting steel pipe is constructed with what is reinforced
The existing basic 4 top surface absolute altitude of object is identical, and error must not exceed ± 50mm to injected hole hole location in length and breadth, and verticality allowable error should not surpass
3 ‰ are crossed, sediment thickness is not more than 50mm after borehole cleaning.
Step 3: mud jacking
1 slip casting of slip casting steel pipe uses M30 cement grout, and the ratio of mud is generally 0.5~1 (being determined by grouting test),
And appropriate retarder is mixed, cement uses P.O.42.5 ordinary portland cement, and mixing water uses drinking water；Using mudjack into
Row mud jacking uses underflow sealing of hole at the end of mud jacking, and controlled grouting pressure is in 0.2~0.5MPa or so.
Step 4: excavation of foundation pit
It is excavated using excavator basic 4 periphery cubic metre of earth existing to the structures that need to be reinforced, excavates gradient 1:1.5, open
0.5~1.0m of depth is dug, nearby the 10cm soil body is used within the scope of the 50cm of basis excavation of foundation pit line 301 using artificial clear bottom
Hand excavation, when excavation, should be noted the protection reinforced to slip casting steel pipe 1, avoid slip casting steel pipe 1 and fracture, is damaged.
Step 5: the binding of framework of steel reinforcement 302 and fixation steel plate 2 weld
Basic 4 surface chisel existing to structures face gently hammers into shape, dabbing, and cleans out the discrete particles on existing basic 4 surface
And dross dust, bar planting hole is set on existing basic 4 according to the position of framework of steel reinforcement 1；First layer fixation steel plate 201 is penetrated
Slip casting steel pipe is simultaneously welded and fixed, and starts framework of steel reinforcement 302 and binds, and the fixed steel of the second layer is penetrated after the completion of the binding of framework of steel reinforcement 302
Fixation steel plate 2 will and be carried out two-sided be fully welded with 302 contact site of framework of steel reinforcement and connect by plate 202.
Step 6: concreting and maintenance
Template installation is carried out and existing basic 4 in 3 contact position brushing interface of antidumping plate according to 3 size of antidumping plate
Agent is handled, and 3 concreting of antidumping plate is then carried out；After concreting, it should cover pour in 12h under normal temperature conditions
Water curing, for irrigation times to keep concrete is wet to be advisable, curing time is no less than sennight.
The above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be to the present invention
The restriction of embodiment can also make on the basis of the above description for those of ordinary skill in the art
Other various forms of variations or variation here can not be exhaustive all embodiments, all to belong to skill of the invention
The obvious changes or variations that art scheme is extended out are still in the scope of protection of the present invention.
Claims (7)
1. a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction, it is characterised in that: including along existing basic (4) outer to
Fixation steel plate (2), slip casting steel pipe (1) and the antidumping plate (3) set gradually outside, the antidumping plate (3) includes reinforcing bar
It frame (302) and pours in the concrete of existing basic (4) surrounding, the fixation steel plate (2), which is square, is set to existing basic (4)
Outside is simultaneously located in the concrete poured, and the fixation steel plate (2) is equipped with according to slip casting steel pipe (1) position preformed hole
Hole, the slip casting steel pipe (1) is circumferentially disposed along existing basic (4) surrounding, and arrangement quantity is no less than 2 rings, adjacent 2 ring slip casting steel pipe
It (1) is in quincunx interlaced arrangement, same ring slip casting steel pipe (1) tail end passes through fixation steel plate (2) reserving hole and fixation steel plate (2)
It is welded and fixed together.
2. a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction according to claim 1, it is characterised in that: described
Framework of steel reinforcement (302) is double layer bar, and the framework of steel reinforcement (302) is connected by the way of bar planting with existing basic (4)
It connects.
3. a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction according to claim 1, it is characterised in that: described
The conehead (101) that slip casting steel pipe (1) front end is equipped with, tail end are equipped with only slurry section (102), and middle section is equipped with equidistant interval setting
Extravasating hole (103).
4. a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction according to claim 3, it is characterised in that: described
The degree of conehead (101) is not less than 10cm, and the length of only slurry section (102) is not less than 1.5m, the spacing of the extravasating hole (103)
For 15cm, the extravasating hole (103) is 10~16mm in quincuncial arrangement and aperture.
5. a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction according to claim 1, it is characterised in that: described
Fixation steel plate (2) is integral by slip casting steel pipe (1) connection, and is welded and fixed securely with framework of steel reinforcement (302), the fixed steel
Plate (2) includes first layer fixation steel plate (201), second layer fixation steel plate (202), the first layer fixation steel plate (201), second
Layer fixation steel plate (202) is located at the over and under of framework of steel reinforcement (302).
6. a kind of surrounding deep foundation pit shallow embedding structure base ruggedized construction according to claim 5, it is characterised in that: described
Fixation steel plate (2) is made by 1cm steel plate, and fixation steel plate (2) width is 3 times of 1 diameter of slip casting steel pipe.
7. a kind of construction method of above-mentioned surrounding deep foundation pit shallow embedding structure base ruggedized construction, feature comprise the steps of:
Step 1: preparation of construction
Field investigation is organized, basic (4) periphery line conditions progress existing to quasi- reinforcing is comprehensive to sound out the people in a given scope one by one in order to break a criminal case, and verifies underground utilities position
It sets；Carry out levelling of the land and people, machine, material preparation.
Step 2: injected hole is drilled with
Strengthening of foundation range is 3~5 times of existing basic (4) width, and injected hole is along the double quincunx cloth of existing basic (4) surrounding
It sets, pitch-row 1.3m × 1.3m, interior row's injected hole is not less than 1m away from spacing on the outside of existing basic (4)；Slip casting bore dia is than slip casting steel
Manage the big 5~10mm of (1) diameter, hole depth according to 10m and enter rock stratum be not less than 2m dual control, slip casting steel pipe (1) top mark height with it is added
Solid existing basic (4) top surface absolute altitude of structures it is identical, error must not exceed ± 50mm to injected hole hole location in length and breadth, and verticality allows
Error is not to be exceeded 3 ‰, and sediment thickness is not more than 50mm after borehole cleaning.
Step 3: mud jacking
(1) slip casting of slip casting steel pipe uses M30 cement grout, and the ratio of mud is generally 0.5~1 (being determined by grouting test), and
Appropriate retarder is mixed, cement uses P.O.42.5 ordinary portland cement, and mixing water uses drinking water；It is carried out using mudjack
Mud jacking uses underflow sealing of hole at the end of mud jacking, and controlled grouting pressure is in 0.2~0.5MPa or so.
Step 4: excavation of foundation pit
It is excavated using excavator basic (4) periphery cubic metre of earth existing to the structures that need to be reinforced, excavates gradient 1:1.5, excavate
0.5~1.0m of depth, nearby the 10cm soil body is used within the scope of the 50cm of basis excavation of foundation pit line (301) using artificial clear bottom
Hand excavation, when excavation, should be noted the protection reinforced to slip casting steel pipe 1, avoid slip casting steel pipe 1 and fracture, is damaged.
Step 5: framework of steel reinforcement (302) binding and fixation steel plate (2) welding
It is existing to structures basis (4) surface chisel face gently hammer, dabbing, and clean out it is existing basis (4) surface discrete particles
And dross dust, bar planting hole is set on existing basic (4) according to the position of framework of steel reinforcement (1)；By first layer fixation steel plate
(201) it penetrates slip casting steel pipe and is welded and fixed, start framework of steel reinforcement (302) binding, penetrated after the completion of framework of steel reinforcement (302) binding
Fixation steel plate (2) will and be carried out two-sided be fully welded with framework of steel reinforcement (302) contact site and connect by second layer fixation steel plate (202).
Step 6: concreting and maintenance
Template installation is carried out and in existing basic (4) in antidumping plate (3) contact position brushing circle according to antidumping plate (3) size
Face agent is handled, and antidumping plate (3) concreting is then carried out；After concreting, it should be covered in 12h under normal temperature conditions
Lid water seasoning, for irrigation times to keep concrete is wet to be advisable, curing time is no less than sennight.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110761288A (en) * | 2019-10-30 | 2020-02-07 | 中国铁建重工集团股份有限公司 | Concrete pouring method for deep foundation pit |
| CN114232598A (en) * | 2021-11-23 | 2022-03-25 | 广州市市政工程机械施工有限公司 | Grouting isolation wall for protecting existing building/structure foundation |
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| CN201567574U (en) * | 2010-01-07 | 2010-09-01 | 贵州省交通规划勘察设计研究院 | Prestressed anchorage anchor pier slope reinforcing and fixing structure |
| CN106499413A (en) * | 2016-11-19 | 2017-03-15 | 中铁十二局集团有限公司 | A kind of Shallow-buried section tunnel stratum consolidation construction method |
| CN108914927A (en) * | 2018-07-30 | 2018-11-30 | 中铁二十三局集团有限公司 | The miniature steel pipe pile reinforced construction method of existing line base insuring highway' slope |
| CN109208627A (en) * | 2018-09-11 | 2019-01-15 | 中建五局土木工程有限公司 | Structure and its construction method are protected in high-rise structures strengthening of foundation |
| CN210827422U (en) * | 2019-06-24 | 2020-06-23 | 中建铁路投资建设集团有限公司 | Peripheral shallow structure foundation reinforced structure that buries of deep basal pit |
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| CN110761288A (en) * | 2019-10-30 | 2020-02-07 | 中国铁建重工集团股份有限公司 | Concrete pouring method for deep foundation pit |
| CN110761288B (en) * | 2019-10-30 | 2021-09-10 | 中国铁建重工集团股份有限公司 | Concrete pouring method for deep foundation pit |
| CN114232598A (en) * | 2021-11-23 | 2022-03-25 | 广州市市政工程机械施工有限公司 | Grouting isolation wall for protecting existing building/structure foundation |
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