CN106436718A - Subway foundation pit large-span support system and construction method thereof - Google Patents
Subway foundation pit large-span support system and construction method thereof Download PDFInfo
- Publication number
- CN106436718A CN106436718A CN201610813599.XA CN201610813599A CN106436718A CN 106436718 A CN106436718 A CN 106436718A CN 201610813599 A CN201610813599 A CN 201610813599A CN 106436718 A CN106436718 A CN 106436718A
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- China
- Prior art keywords
- support
- truss
- foundation pit
- support unit
- horizontal
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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
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
Abstract
The invention relates to a subway foundation pit large-span support system and a construction method thereof. The system comprises horizontal truss support units horizontally supported between underground diaphragm walls of a foundation bit. The horizontal truss support units are uniformly distributed in parallel and at an interval along length and height directions; and each horizontal truss support unit comprises an upper-plane truss support, a lower-plane truss support and connecting rods vertically connected between the upper-plane truss support and the lower-plane truss support. The construction method comprises the following steps of during a construction process, installing one horizontal support unit at a designed elevation, then excavating a corresponding soil body in layers, utilizing a guide rail to drop the other horizontal support unit to a designed elevation through a lifting power device, excavating a corresponding soil body in layers again, and repeating the steps until finishing construction of a basement. The subway foundation pit large-span support system and the construction method thereof are suitable for earth excavating construction of the deep foundation pit; in addition, the horizontal support units adopt spatial truss structures so as to be high in structural strength; and the support system is adopted to meet the requirements on stability and deformation control of the subway foundation pit, and has the characteristic of large span at the same time.
Description
Technical field
The present invention relates to subway foundation pit construction field, particularly a kind of supporter and its construction method.
Background technology
Armored concrete and steel pipe are mainly to supportting currently for the main support system that subway foundation pit is adopted, particularly
Steel pipe support therein, its horizontally disposed spacing is often less than 3m, but the development further with subway field, foundation ditch
Width is also increasing, and traditional support strength can not meet the demand of subway foundation pit large span, additionally, narrow based on subway station
Long, the flat shape feature of rectangle, subway foundation pit earth excavation is typically moved back using step and digs the method for relay and carry out.Due to water
Too closely, operation side is little for the flat spacing for supporting setting, and earth excavation machinery often adopts the less excavating equipment of dipper capacity,
Earth excavation is completed by way of step relay, greatly reduce earth excavation work efficiency；On the other hand, in steel pipe support
When lifting by root, because closeer horizontal support spacing, it is necessary to avoid the mutual collision for supporting when lifting, still need after lifting is in place
It is supported end and is welded and fixed and supports pre-stress construction, supports installation difficulty, efficiency of construction underground.
It is well known that the principle that pit earthwork excavation must comply with " first support and dig afterwards " is carried out, found by investigation, even if adopting
Earth excavation is carried out with the less digging machine of the relatively low dipper capacity of work efficiency, the installation efficiency of support far can not also meet earth excavation will
Ask, earth excavation and support install no matter both temporally and spatially all cannot realize mutual satisfaction, cause horizontal support
Install and earth excavation is often lagged behind, be that base pit engineering buries huge potential safety hazard.
To sum up, for the subway foundation pit engineering of current sleeve configuration rule, opened using existing horizontal struts system and the earthwork
Excavation method, all causes certain difficulty on duration and safety to engineering construction.
Content of the invention
It is an object of the invention to provide a kind of subway foundation pit large span support system and its construction method, will solve existing base
Hole supports the technical problem that span is little, structural strength is low；And solve the problems, such as low construction efficiency.
For achieving the above object, the present invention is adopted the following technical scheme that：
A kind of subway foundation pit large span support system, the horizontal truss including being horizontally supported between foundation ditch diaphram wall is supported
Unit, the horizontal truss support unit is uniformly distributed along the length of foundation ditch and short transverse parallel interval, the horizontal girder
Frame support unit includes plane girder support, lower plane truss support and vertical connection connecting rod between.
The upper plane girder is supported includes two along the setting of foundation ditch width to supportting steel truss, being connected to supportting steel
Fringe truss between truss two ends is supportted to the Chinese lute for supportting on the two sides of steel truss two ends with being connected to.
The lower plane truss support and parallel interval identical with upper plane girder supporting construction is arranged.
Described to support steel truss include parallel to support mobile jib and be connected to support between mobile jib to supportting web member.
The fringe truss includes the fringe truss web member between parallel fringe truss mobile jib and connection fringe truss mobile jib.
The Chinese lute support includes angularly disposed to supportting the Chinese lute support mobile jib between steel truss and fringe truss and connection Chinese lute
Support mobile jib and web member is supportted to the Chinese lute for supportting between steel truss and fringe truss.
Lifting drive machine is connected between the fringe truss of the horizontal truss support unit and foundation ditch diaphram wall
Structure.
At least four groups of the lifting drive mechanism, it is symmetrically distributed in horizontal truss support unit both sides.
The lifting drive mechanism includes to be connected to the jack of horizontal truss support unit end, be connected to jack before
The cradle head at end, the rolling wheel support being hinged on cradle head and the roller being hinged on rolling wheel support.
The rolling wheel support is triangular plate or bends strip board at an acute angle, its drift angle is hinged with cradle head,
Two base angles are symmetrically hinged with a roller.
A kind of construction method of the large span support system of subway foundation pit as mentioned, it is characterised in that comprise the following steps that：
Step one, to supportting mobile jib, to supportting web member assembling to supportting steel truss.
Step 2, truss mobile jib, fringe truss web member assembling fringe truss.
Step 3, Chinese lute support mobile jib, Chinese lute support web member assembling Chinese lute support.
Step 4, supports assembly connection successively to supportting steel truss, fringe truss and Chinese lute, is assembled into horizontal truss support unit.
Step 5, as ground floor at designed elevation position during horizontal truss support unit is integrally hung to subway foundation pit
Horizontal truss support unit.
Step 6, accurate adjustment ground floor horizontal truss support unit plan-position and perpendicularity are simultaneously fixing.
Step 7, excavates the first layer soil body to designed elevation position.
Step 8, repeat step one to step 4, during another horizontal truss support unit is integrally hung to subway foundation pit
As second layer horizontal truss support unit at designed elevation position.
Step 9, accurate adjustment second layer horizontal truss support unit plan-position and perpendicularity are simultaneously fixing.
Step 10, is dropped to ground floor horizontal truss support unit at designed elevation position using lifting drive mechanism.
Step 11, accurate adjustment ground floor horizontal truss support unit plan-position and perpendicularity are simultaneously fixing.
Step 12, excavates the second layer soil body.
Step 13, repeat step eight to step 12, until complete the earth excavation construction of subway foundation pit.
In the step 6, the two ends of ground floor horizontal truss support unit correspond to and are fixed on the first of subway foundation pit top
In Guan Liang and the second Guan Liang.
Compared with prior art the invention has the characteristics that and beneficial effect：
Present invention subway foundation pit construction different from the past, but some by the rectangle rule subway foundation pit of sleeve configuration to be divided into
Unit, each unit passes through to arrange level support unit, on the premise of subway foundation pit stability and Deformation control requirement is met,
With assembled, large span, liftable feature so that subway foundation pit working space is big, and efficiency of construction is higher, is subway
Foundation pit construction field proposes a kind of new support system and construction method, is low-carbon (LC), green, quick, safe construction technology, both
Earth excavation work efficiency can be accelerated, shorten the engineering construction duration, while by the integral elevating of level support unit, it is to avoid traditionally
Iron-based hole can not follow, because of barbarous construction, the deep pit monitor hidden danger for first supportting that the principle that digs afterwards causes.
In work progress, first level support unit is arranged on designed elevation 1, then the corresponding soil body of stage excavation, then
Using guide rail, level support unit is dropped to designed elevation 2 by lifting power plant, again the corresponding soil body of stage excavation, this
Sample by that analogy, is completed to bottom construction, efficiency of construction height, it is adaptable to the earth excavation construction of deep basal pit, in addition, horizontal support
Unit adopts space truss type structure, and structural strength is high, is meeting subway foundation pit stability and deformation using this support system
While control is required, also there is large span, as a example by being respectively 18m, 23m with the size of subway foundation pit both direction,
The headroom of about 13m × 16m in the range of support system, is defined, large-scale work surface can be provided and made for backacter machine
Industry space, and the lifting of level support unit is completed using lifting drive unit matching guide rail, than installing more conventional coagulation
Soil or steel pipe inner supporting are more efficient, and safety coefficient is more preferable, structure is more stable.
Description of the drawings
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of horizontal truss support unit of the present invention.
Fig. 2 is design structure schematic diagram before present invention construction.
The view of the step of Fig. 3 is the present invention five.
The view of the step of Fig. 4 is the present invention seven.
The view of the step of Fig. 5 is the present invention 11.
The view of the step of Fig. 6 is the present invention 12.
Fig. 7 is the structural representation of lifting drive mechanism of the present invention.
Reference：1- is to supportting steel truss, 2- fringe truss, the support of 3- Chinese lute, 4- subway foundation pit, the first underground of 5- even
Continuous wall, the second diaphram wall of 6-, the first Guan Liang of 7-, the second Guan Liang of 8-, 9- ground floor horizontal truss support unit, 10-
Lifting drive mechanism, the first layer soil body of 11-, 12- second layer horizontal truss support unit, the first layer soil body of 13-, 14- roller,
15- jack, 16- cradle head, 17- rolling wheel support.
Specific embodiment
Embodiment is shown in Figure 1, and in this example, the size of subway foundation pit both direction is respectively 18m, 23m；In supporter
In the range of system, define the headroom of about 13m × 16m, medium-sized backacter can direct operation within this range, relatively arrange
Conventional inner support, expands excavation scope, can improve subway foundation pit efficiency of construction.After fortune is dug in the earthwork, by lifting drive mechanism
Horizontal truss support system is dropped quickly to designed elevation, improves support installation effectiveness.
This subway foundation pit large span support system, including the horizontal truss being horizontally supported between foundation ditch diaphram wall
Support unit, the horizontal truss support unit is uniformly distributed along the length of foundation ditch and short transverse parallel interval, the water
Plane frame work support unit includes plane girder support, lower plane truss support and vertical connection connecting rod between.
Shown in Figure 1, the upper plane girder is supported includes two along the setting of foundation ditch width to supportting steel truss
1st, it is connected to the fringe truss 2 between support 1 two ends of steel truss and is connected to supportting the Chinese lute support 3 on 1 two ends two sides of steel truss；
The lower plane truss support and parallel interval identical with upper plane girder supporting construction is arranged.
Described to support steel truss 1 include parallel to support mobile jib and be connected to support between mobile jib to supportting web member；Described
Fringe truss 2 includes the fringe truss web member between parallel fringe truss mobile jib and connection fringe truss mobile jib；The Chinese lute support 3 is included tiltedly
To be arranged on to support the Chinese lute support mobile jib between steel truss 1 and fringe truss 2 and connection Chinese lute support mobile jib with to supportting steel truss 1 and side
Chinese lute support web member between truss 2.
Shown in Figure 7, liter is connected between the fringe truss 2 of the horizontal truss support unit and foundation ditch diaphram wall
Drop actuating unit 10；Between the upper plane girder support of the horizontal truss support unit, the both ends of lower plane truss support
Interval be connected with connecting plate, the lifting drive mechanism 10 have 12 groups, correspondence be welded on horizontal truss support unit both sides
On connecting plate, connect six groups per side；The lifting drive mechanism 10 includes to be connected to the very heavy of horizontal truss support unit end
Push up 15, the cradle head 16 for being connected to jack front end, the rolling wheel support 17 being hinged on cradle head 16 and be hinged on roller
Roller 14 on support 17；The rolling wheel support 17 is triangular plate or bends strip board at an acute angle, its drift angle with turn
Movable joint 16 is hinged, two base angles are symmetrically hinged with a roller 14.
A kind of construction method of the large span support system of subway foundation pit as mentioned, it is characterised in that comprise the following steps that：
Step one, to supportting mobile jib, to supportting web member assembling to supportting steel truss.
Step 2, truss mobile jib, fringe truss web member assembling fringe truss.
Step 3, Chinese lute support mobile jib, Chinese lute support web member assembling Chinese lute support.
Step 4, supports assembly connection successively to supportting steel truss, fringe truss and Chinese lute, is assembled into horizontal truss support unit.
Step 5, shown in Figure 3, designed elevation 1 during horizontal truss support unit is integrally hung to subway foundation pit 4
Place is put as ground floor horizontal truss support unit 9.
Step 6, accurate 9 plan-position of adjustment ground floor horizontal truss support unit and perpendicularity are simultaneously fixing.
Step 7, shown in Figure 4, the first layer soil body 11 is excavated to 2 position of designed elevation.
Step 8, repeat step one to step 4, during another horizontal truss support unit is integrally hung to subway foundation pit 4
As second layer horizontal truss support unit 12 at 1 position of designed elevation.
Step 9, accurate 12 plan-position of adjustment second layer horizontal truss support unit and perpendicularity are simultaneously fixing.
Ground floor horizontal truss support unit 9 is dropped to 2 position of designed elevation using lifting drive mechanism 10 by step 10
Place.
Step 11, shown in Figure 5, accurate 9 plan-position of adjustment ground floor horizontal truss support unit and perpendicularity,
And it is fixing.
Step 12, shown in Figure 6, excavate the second layer soil body 13.
Step 13, repeat step eight to step 12, until complete the earth excavation construction of subway foundation pit 4.
In the step 6, the two ends of ground floor horizontal truss support unit 9 correspond to and are fixed on the of subway foundation pit top
In one Guan Liang 7 and the second Guan Liang 8.
Claims (10)
1. a kind of subway foundation pit large span support system, the horizontal truss including being horizontally supported between foundation ditch diaphram wall is propped up
Support unit, the horizontal truss support unit is uniformly distributed along the length of foundation ditch and short transverse parallel interval, and its feature exists
In：The horizontal truss support unit include plane girder support, lower plane truss support and be vertically connected to both it
Between connecting rod；
The upper plane girder is supported includes two along the setting of foundation ditch width to supportting steel truss（1）, be connected to support steel
Truss（1）Fringe truss between two ends（2）Be connected to support steel truss（1）Chinese lute support on the two sides of two ends（3）；
The lower plane truss support and parallel interval identical with upper plane girder supporting construction is arranged.
2. subway foundation pit large span support system according to claim 1, it is characterised in that：Described to support steel truss（1）
Including parallel to supportting mobile jib and being connected to to supportting web member between support mobile jib.
3. subway foundation pit large span support system according to claim 1, it is characterised in that：The fringe truss（2）Including
Fringe truss web member between parallel fringe truss mobile jib and connection fringe truss mobile jib.
4. subway foundation pit large span support system according to claim 1, it is characterised in that：The Chinese lute support（3）Including
Angularly disposed to support steel truss（1）And fringe truss（2）Between Chinese lute support mobile jib and connection Chinese lute support mobile jib with to support steel truss
Frame（1）And fringe truss（2）Between Chinese lute support web member.
5. the subway foundation pit large span support system according to Claims 1-4 any one, it is characterised in that：The institute
State the fringe truss of horizontal truss support unit（2）Lifting drive mechanism is connected between foundation ditch diaphram wall（10）.
6. subway foundation pit large span support system according to claim 5, it is characterised in that：The lifting drive mechanism
（10）At least four groups, be symmetrically distributed in horizontal truss support unit both sides.
7. subway foundation pit large span support system according to claim 6, it is characterised in that：The lifting drive mechanism
（10）Including being connected to the jack of horizontal truss support unit end（15）, be connected to the cradle head of jack front end
（16）, be hinged on cradle head（16）On rolling wheel support（17）Be hinged on rolling wheel support（17）On roller（14）.
8. subway foundation pit large span support system according to claim 7, it is characterised in that：The rolling wheel support（17）For
Triangular plate or bending strip board at an acute angle, its drift angle and cradle head（16）Hinged, two base angles are symmetrically hinged with one
Individual roller（14）.
9. a kind of construction method of the subway foundation pit large span support system as described in claim 5 to 8 any one, its feature
It is, comprises the following steps that：
Step one, to supportting mobile jib, to supportting web member assembling to supportting steel truss；
Step 2, truss mobile jib, fringe truss web member assembling fringe truss；
Step 3, Chinese lute support mobile jib, Chinese lute support web member assembling Chinese lute support；
Step 4, supports assembly connection successively to supportting steel truss, fringe truss and Chinese lute, is assembled into horizontal truss support unit；
Step 5, horizontal truss support unit is integrally hung to subway foundation pit（4）Middle designed elevation（1）As first at position
Layer horizontal truss support unit（9）；
Step 6, accurate adjustment ground floor horizontal truss support unit（9）Plan-position and perpendicularity fixation；
Step 7, excavates the first layer soil body（11）To designed elevation（2）At position；
Step 8, repeat step one to step 4, another horizontal truss support unit is integrally hung to subway foundation pit（4）In set
As second layer horizontal truss support unit at meter 1 position of absolute altitude（12）；
Step 9, accurate adjustment second layer horizontal truss support unit（12）Plan-position and perpendicularity fixation；
Step 10, using lifting drive mechanism（10）By ground floor horizontal truss support unit（9）Drop to 2 position of designed elevation
Place；
Step 11, accurate adjustment ground floor horizontal truss support unit（9）Plan-position and perpendicularity fixation；
Step 12, excavates the second layer soil body（13）；
Step 13, repeat step eight is to step 12, until completing subway foundation pit（4）Earth excavation construction.
10. construction method according to claim 9, it is characterised in that：In the step 6, ground floor horizontal truss is supported
Unit（9）Two ends correspond to and be fixed on first Guan Liang at subway foundation pit top（7）With the second Guan Liang（8）On.
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| CN201610813599.XA CN106436718B (en) | 2016-09-09 | 2016-09-09 | A kind of subway foundation pit large span support system and its construction method |
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|---|---|---|---|
| CN201610813599.XA CN106436718B (en) | 2016-09-09 | 2016-09-09 | A kind of subway foundation pit large span support system and its construction method |
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| CN106436718B CN106436718B (en) | 2018-11-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106968271A (en) * | 2017-03-09 | 2017-07-21 | 中国建筑第八工程局有限公司 | The construction method that underground pipe gallery is excavated and supported |
| CN108708381A (en) * | 2018-06-08 | 2018-10-26 | 中国铁道科学研究院深圳研究设计院 | A kind of load retaining wall double-row pile combination large span support combinations support system |
| CN108755706A (en) * | 2018-08-23 | 2018-11-06 | 东莞市建筑科学研究所 | Removable internal support of foundation pit system and foundation ditch construction method |
| CN111173001A (en) * | 2020-02-22 | 2020-05-19 | 王笑然 | Multi-row pile foundation pit supporting structure |
| CN113389204A (en) * | 2021-06-29 | 2021-09-14 | 上海隧道工程有限公司 | Construction method of deep foundation pit sliding type rapid pre-support system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106968271A (en) * | 2017-03-09 | 2017-07-21 | 中国建筑第八工程局有限公司 | The construction method that underground pipe gallery is excavated and supported |
| CN106968271B (en) * | 2017-03-09 | 2019-05-10 | 中国建筑第八工程局有限公司 | Underground pipe gallery excavates and the construction method of support |
| CN108708381A (en) * | 2018-06-08 | 2018-10-26 | 中国铁道科学研究院深圳研究设计院 | A kind of load retaining wall double-row pile combination large span support combinations support system |
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| CN108755706B (en) * | 2018-08-23 | 2023-12-12 | 东莞市建筑科学研究院有限公司 | Movable foundation pit inner support system and foundation pit construction method |
| CN111173001A (en) * | 2020-02-22 | 2020-05-19 | 王笑然 | Multi-row pile foundation pit supporting structure |
| CN111173001B (en) * | 2020-02-22 | 2021-08-06 | 广东新业建设股份有限公司 | Multi-row pile foundation pit supporting structure |
| CN113389204A (en) * | 2021-06-29 | 2021-09-14 | 上海隧道工程有限公司 | Construction method of deep foundation pit sliding type rapid pre-support system |
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| CN106436718B (en) | 2018-11-09 |
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