CN110158603A - Long and narrow deep foundation pit earthwork digging method - Google Patents
Long and narrow deep foundation pit earthwork digging method Download PDFInfo
- Publication number
- CN110158603A CN110158603A CN201910513532.8A CN201910513532A CN110158603A CN 110158603 A CN110158603 A CN 110158603A CN 201910513532 A CN201910513532 A CN 201910513532A CN 110158603 A CN110158603 A CN 110158603A
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- China
- Prior art keywords
- foundation pit
- long
- steel pipe
- layer
- pipe support
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The present invention provides a kind of long and narrow deep foundation pit earthwork digging methods, adequately utilize the strength and stiffness of ground-connecting-wall supporting construction, earth excavation suitable for long and narrow deep basal pit form, pit earthwork, which excavates, selects large excavator construction, vertically press the vertical spaced divisions of steel pipe support, horizontal direction is layered by steel pipe support horizontal space, and the upper layer soil body is excavated by the way of mechanical heavy excavation；Lower layer's soil body is regressed using step-like layering and is excavated, and indwelling mounting platform, after the installation is completed to same vertical layered steel pipe support, then excavates the platform soil body, and is continued next layered soil and excavated, until all construction is completed.The present invention can be obviously shortened construction period；The construction machinery used is less, can reduce exhaust emissions, mitigates the pollution to atmosphere；Supporting construction and the middle kerve soil body are made full use of, it is excavated using function, creates convenience for construction.
Description
Technical field
The present invention relates to a kind of long and narrow deep foundation pit earthwork digging methods, are taking diaphram wall to add more particularly, to one kind
The long and narrow deep foundation pit earthwork digging method of steel pipe inner supporting support pattern.
Background technique
With the development of society and the progress of construction technology, depth that building, structures etc. are expanded space to underground and
Range is gradually increasing, these are all inevitably related to the earth excavation construction of deep basal pit.It is limited to engineering geology, the hydrology
Complexity, be limited to construction machinery (swing arm height, radius of gyration etc.), construction method (the especially form of supporting construction)
Selection need to comprehensively consider all kinds of influence factors in deep foundation pit earthwork digging, could accomplish in construction safety, it is economical,
Quickly, environmentally friendly.
In the patent of 103410152 B of patent No. CN, a kind of construction for long and narrow deep foundation pit earthwork digging is provided
Method, comprising the following steps:
1) foundation pit part is integrally excavated using large excavator, slot is stayed in foundation pit center, installs steel pipe diagonal brace；
2) slope is longitudinally drawn into foundation pit soil layer top surface using large excavator, forms bull-dozer soil-shifting condition；
3) bull-dozer is longitudinally drawing upslope formula dozing in slope that it is mountable to reach bracing members from low side to high-end soil-shifting
Height after, in time follow-up installation steel shotcrete support structure；
4) the fender post soil that nearby reserved soil or bull-dozer can not construct behind is fed native using mini-excavator, bull-dozer to
One end is bulldozed, and outward transport is concentrated；
5) after the completion of long and narrow deep foundation pit earthwork digging, excavating equipment is hung out from deep basal pit with crane.
B. the construction method of long and narrow deep foundation pit earthwork digging is used for according to scheme requirement a, it is characterised in that: step
1) before, operation of loosening the soil is carried out according to the selection of engineering site condition.
C. the construction method of long and narrow deep foundation pit earthwork digging is used for according to scheme requirement b, it is characterised in that: described
The machinery of operation of loosening the soil is mini-excavator, and the scraper bowl in the mini-excavator backhoe is only hook ridge buster.
D. the construction method of long and narrow deep foundation pit earthwork digging is used for according to scheme requirement c, it is characterised in that: step
1) in, the method for soil is fallen using large excavator, dump truck changes the miscellaneous fill sidewalk filled out from rock ballast and is unearthed.
E. the construction method of long and narrow deep foundation pit earthwork digging is used for according to scheme requirement d, it is characterised in that: step
2) in, at longitudinal place for drawing slope that can enter at present to dump truck.
F. the construction method of long and narrow deep foundation pit earthwork digging is used for according to scheme requirement e, it is characterised in that: step
3) in, bull-dozer is since being stayed among slot foundation pit center along longitudinal direction from low side to high-end soil-shifting.
G. the construction method of long and narrow deep foundation pit earthwork digging is used for according to scheme requirement f, which is characterized in that step
4) it further includes steps of
(1) bull-dozer by soil be pushed into can entrucking position, then pulled away on the dump truck with large excavator；
(2) after reaching second bracing members installable height, second bracing members are installed in time；
(3) after being installed, pit earthwork excavation once sees the bottom, first of bracing members and second bracing members install with
It successively follows up forward in digging face.
H. the described in any item construction methods for long and narrow deep foundation pit earthwork digging of a-g, feature are required according to scheme
Be: long and narrow deep basal pit length range is 130m~200m.
The program is longitudinally drawn using excavator in excavation of foundation pit and stays slot among slope, forms bull-dozer soil-shifting condition, then
Excavator and bull-dozer cooperation shoveling are native, and as the intensification of cutting depth installs bracing members simultaneously, and the closing slope that regresses is unearthed, directly
It is completed to earth excavation.
The patent there are the shortcomings that:
1, the unearthed limited speed of above scheme is in the mechanical performance of excavator in foundation pit and bull-dozer, due to propping up in construction
It supports vertical spacing and is generally 3~5m, the excavator of operation and bull-dozer type selecting are limited to support vertical spacing again in foundation pit, can only
Small-sized machine is selected, is unearthed relatively slow；
2, in above scheme, slot is stayed in centre behind longitudinal drawing slope, soil is only used as balance foundation pit lateral pressure more than two sides, not sufficiently
Utilize its effect.
Summary of the invention
The present invention provides a kind of long and narrow deep foundation pit earthwork digging method, overcoming can only be using mini-excavator, soil-shifting
Machine causes earth excavation to be unearthed slow-footed disadvantage, while the second layer soil body being made full use of to act on, and guarantees that foundation pit is stable and conveniently
Horizontal support installation.It is described that its technical solution is as follows:
A kind of long and narrow deep foundation pit earthwork digging method, comprising the following steps:
(1) horizontal slice and vertical division block are carried out to long and narrow Deep Foundation Pit Excavation according to horizontal, the vertical distribution of steel pipe support,
Horizontal direction is layered by the horizontal space of steel pipe support, the vertical vertical spaced divisions for pressing steel pipe support；
(2) horizontal direction is divided into the first layer soil body and the second layer soil body, and the first layer soil body directly excavates and do not need vertical division block；
(3) second layer soil bodies are a subregion according to the every twice of horizontal distance of bracing members, are regressed using step-like subregion
It excavates；
(4) below second layer steel pipe support bracket in indwelling mounting platform by the way of kerve, to same vertical division block
Steel pipe support after the installation is completed, then excavate the platform soil body, and continue next subregion soil excavation；
(5) earth excavation is to the section that finishes up, and when earthmoving vehicle can not be down toward foundation pit, using extension arm excavator, soil is filled
Vehicle, until the earthwork is all excavated.
Further, in step (2), the first layer soil body is directly dug by the way of mechanical heavy excavation to first floor steel pipe support
Lower 1.5m, in the foundation pit other end, there are unearthed ramps.
Further, in step (3), the length of subregion is 10m.
Further, step-like to be formed by the way of kerve in step (3).
Further, in step (4), first layer, the second layer steel pipe support immediately following subregion excavate progress with dig with branch.
Further, in step (4), according to the height reasonable disposition excavator of second layer steel pipe support to bottom of foundation ditch,
Second layer excavator is cooperated to be unearthed when construction, the slope at excavator both ends is the slope ratio of 1:1.
The present invention adequately utilizes the strength and stiffness of ground-connecting-wall supporting construction, the earthwork suitable for long and narrow deep basal pit form
It excavates, pit earthwork, which excavates, selects large excavator construction, vertically presses the vertical spaced divisions of steel pipe support, horizontal direction presses steel pipe branch
Horizontal space layering is supportted, the upper layer soil body is excavated by the way of mechanical heavy excavation；Lower layer's soil body is opened using the room for manoeuvre of step-like subregion
It digs, and indwelling mounting platform, the steel pipe support to same vertical division block after the installation is completed, then are excavated flat by the way of kerve in
The platform soil body, and continue next subregion soil excavation, until all construction is completed；Soil at both sides after intermediate kerve is filled
Point utilize, which is accomplished platform by the present invention, be used as horizontal support mounting operation platform, platform section be it is trapezoidal, top width 1.2~
1.5m is highly lower than bracing members 1.5m, and slope is compared on the oblique slope by 1:1.Platform predominantly balances foundation pit soil lateral pressure and use
Make bracing members mounting platform, excavates again after the completion of operation.
Technical solution of the present invention bring the utility model has the advantages that
1, the program is excavated because directly being regressed using large excavator subregion piecemeal, accelerates the progress of earth excavation,
Construction period can be obviously shortened；
2, the construction machinery that the program uses is less, can reduce exhaust emissions, mitigates the pollution to atmosphere；
3, the program makes full use of supporting construction and the middle kerve soil body, excavates it using function, creates convenience for construction.
Detailed description of the invention
Fig. 1 is that pit earthwork excavates horizontal slice figure；
Fig. 2 is that pit earthwork excavates vertical layered figure；
Fig. 3 is that 1. layer soil body excavates schematic diagram；
Fig. 4 is that 2. layer soil body excavates schematic diagram；
Fig. 5 is steel pipe inner supporting scheme of installation；
Fig. 6 is that 2. layer soil body excavates schematic diagram cross-section diagram.
Specific embodiment
The present invention provides a kind of in the long and narrow Deep Foundation Pit Excavation for taking diaphram wall to add steel pipe inner supporting support pattern
Excavation method, including the following steps:
As shown in Figure 1, horizontal direction is layered by steel pipe support horizontal space, horizontal direction is divided into 1. layer soil body and 2. layer soil body.
1. layer soil body directly excavates and does not need vertical division block.
Shown in Fig. 2, pit earthwork excavation is vertical, and by the vertical spaced divisions of steel pipe support, (design drawing has the water of bracing members
Flat, vertical distribution design, horizontal, the vertical spacing between bracing members that when construction requires according to design drawing is layered, point
Area), it is divided into the area the A multiple subregions in the area-I.2. layer soil body is a subregion according to the horizontal distance every 2 of bracing members.Partition length
10 meters, it can satisfy the swing arm length of big machinery.
The Regionalization basis of vertical division block is as deep as possible below first layer Horizontal steelwork bracing after designing unit calculates safely
Depth.Primarily to reduce by the earth volume that 2. layer excavates, the 2. layer earth excavation influenced by installation support, excavate efficiency
Compared with, 1. layer is much lower.
It is the practical value in real case in figure.1. the depth of layer soil body is 3m, 2. the depth of layer soil body is 4.55m.
Steel pipe support is divided into first layer, the second layer, and the layout structure of steel pipe support installation, which is generally provided by designing unit, to be set
Drawing is counted to determine.Steel pipe support horizontal space 5m, two layers of steel pipe support longitudinal pitch 2.5m, two layers of steel pipe support vertical non-alignment.
Wherein, as shown in Figure 3 and Figure 4, the length of long and narrow deep basal pit is 83m, and 1. layer soil body uses the side of mechanical heavy excavation
Formula is directly dug to 1.5m below first layer bracing members, and bracket and purlin are installed；In the technical solution, 1. layer soil body uses machine
1.5m under the mode of tool heavy excavation is directly dug to first floor steel pipe support is stayed in the foundation pit other end and is unearthed as shown on the right side of Fig. 3
Ramp.2. layer soil body is regressed using step-like layering and excavated, step-like is mode such as Fig. 6 of middle kerve.
Also, in the long mounting platform step-like to indwelling of foundation pit.As shown in figure 5, second layer steel pipe support bracket with
It is lower that indwelling mounting platform, the steel pipe support to same vertical division block after the installation is completed, then excavate platform by the way of kerve in
The soil body, and continue next subregion soil excavation.
The mode of middle kerve is long to first excavating the middle part soil body along foundation pit i.e. in soil mass of foundation pit excavation, soil at both sides indwelling,
The digging mode of the earthwork is excavated after complete bracing members to be installed again.
As shown in fig. 6,2. kerve mode is excavated in the use of layer soil body excavation, which need to be in strict accordance with steel branch
The horizontal space of support, which regresses, to be excavated, and first and second layer of steel pipe support is immediately following stage excavation progress with digging with branch, and steel pipe support is also the
2. being layered installation when layer stage excavation.This section excavation need to rationally match according to the height of second layer steel pipe support to bottom of foundation ditch
Set excavator, 2. layer excavator is unearthed for cooperation when construction.1 meter of width of the expression of level 1 in figure, the oblique slope ratio for indicating 1:1.
Earth excavation is to the section that finishes up, and when earthmoving vehicle can not be down toward foundation pit, falls native entrucking using extension arm excavator,
Until the earthwork is all excavated.
Technical solution of the present invention bring the utility model has the advantages that
1, the program is excavated because directly being regressed using large excavator subregion piecemeal, accelerates the progress of earth excavation,
Construction period can be obviously shortened；
2, the construction machinery that the program is selected is less, can reduce exhaust emissions, mitigates the pollution to atmosphere；
3, the program makes full use of supporting construction and the middle kerve soil body, excavates it using function, creates convenience for construction.
Claims (7)
1. a kind of long and narrow deep foundation pit earthwork digging method, comprising the following steps:
(1) horizontal slice and vertical division block are carried out to long and narrow Deep Foundation Pit Excavation according to horizontal, the vertical distribution of steel pipe support, it is horizontal
Direction is layered by the horizontal space of steel pipe support, the vertical vertical spaced divisions for pressing steel pipe support；
(2) horizontal direction is divided into the first layer soil body and the second layer soil body, and the first layer soil body directly excavates and do not need vertical division block；
(3) second layer soil bodies are a subregion according to the every twice of horizontal distance of bracing members, are regressed and are excavated using step-like subregion；
(4) below second layer steel pipe support bracket in indwelling mounting platform, the steel to same vertical division block by the way of kerve
Pipe supports after the installation is completed, then excavates the platform soil body, and continue next subregion soil excavation；
(5) earth excavation is to the section that finishes up, and when earthmoving vehicle can not be down toward foundation pit, falls native entrucking using extension arm excavator,
Until the earthwork is all excavated.
2. long and narrow deep foundation pit earthwork digging method according to claim 1, comprising the following steps: in step (2), first layer
The soil body is directly dug to 1.5m under first floor steel pipe support by the way of mechanical heavy excavation, and in the foundation pit other end, there are unearthed ramps.
3. long and narrow deep foundation pit earthwork digging method according to claim 1, comprising the following steps: in step (3), subregion
Length is 10m.
4. long and narrow deep foundation pit earthwork digging method according to claim 1, comprising the following steps: step-like in step (3)
It is formed by the way of kerve in.
5. long and narrow deep foundation pit earthwork digging method according to claim 1, comprising the following steps: in step (4), first
Layer, the second layer steel pipe support immediately following subregion excavate progress with dig with branch.
6. long and narrow deep foundation pit earthwork digging method according to claim 1, comprising the following steps: in step (4), according to
Two layers of steel pipe support are to the height reasonable disposition excavator of bottom of foundation ditch, and cooperation second layer excavator is unearthed when construction, excavator
The slope at both ends is the slope ratio of 1:1.
7. long and narrow deep foundation pit earthwork digging method according to claim 1, comprising the following steps: second layer soil excavation is applied
Work is by the way of intermediate kerve two sides indwelling platform.Platform section is trapezoidal, top width 1.5m, is highly lower than bracing members 1.5m,
Compare slope in the oblique slope by 1:1.Platform predominantly balances foundation pit soil lateral pressure and is used as bracing members and installs.
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| CN201910513532.8A CN110158603A (en) | 2019-06-14 | 2019-06-14 | Long and narrow deep foundation pit earthwork digging method |
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| CN201910513532.8A CN110158603A (en) | 2019-06-14 | 2019-06-14 | Long and narrow deep foundation pit earthwork digging method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114086566A (en) * | 2021-11-10 | 2022-02-25 | 中铁第四勘察设计院集团有限公司 | Long and narrow soft soil foundation pit excavation support and soil transportation method |
| CN114703860A (en) * | 2022-03-18 | 2022-07-05 | 北京住总集团有限责任公司 | Foundation pit supporting structure and construction method thereof |
| CN114908761A (en) * | 2022-06-08 | 2022-08-16 | 中国二十冶集团有限公司 | Excavation construction method of foundation pit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114086566A (en) * | 2021-11-10 | 2022-02-25 | 中铁第四勘察设计院集团有限公司 | Long and narrow soft soil foundation pit excavation support and soil transportation method |
| CN114703860A (en) * | 2022-03-18 | 2022-07-05 | 北京住总集团有限责任公司 | Foundation pit supporting structure and construction method thereof |
| CN114908761A (en) * | 2022-06-08 | 2022-08-16 | 中国二十冶集团有限公司 | Excavation construction method of foundation pit |
| CN114908761B (en) * | 2022-06-08 | 2023-07-21 | 中国二十冶集团有限公司 | Excavation construction method for foundation pit |
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