CN106436718B - A kind of subway foundation pit large span support system and its construction method - Google Patents
A kind of subway foundation pit large span support system and its construction method Download PDFInfo
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- CN106436718B CN106436718B CN201610813599.XA CN201610813599A CN106436718B CN 106436718 B CN106436718 B CN 106436718B CN 201610813599 A CN201610813599 A CN 201610813599A CN 106436718 B CN106436718 B CN 106436718B
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- support
- truss
- foundation pit
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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
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- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Sustainable Development (AREA)
- Environmental & Geological Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
A kind of subway foundation pit large span support system and its construction method, the system includes the horizontal truss support unit between being horizontally supported at foundation pit diaphram wall, horizontal truss support unit is uniformly distributed along the length and short transverse parallel interval of foundation pit, and horizontal truss support unit includes upper plane girder support, the connecting rod of lower plane truss support and vertical connection therebetween.The present invention is in the construction process, level support unit is first mounted on designed elevation 1, the then corresponding soil body of stage excavation, recycle guide rail that level support unit is dropped to designed elevation 2 by lifting power plant, the corresponding soil body of stage excavation again, in this way and so on, it constructs and completes to bottom, construction efficiency is high, earth excavation suitable for deep basal pit is constructed, in addition, level support unit uses space truss type structure, structural strength is high, using this support system while meeting subway foundation pit stability and Deformation control requires, also has the characteristics that large span.
Description
Technical field
The present invention relates to subway foundation pit construction field, especially a kind of supporter and its construction method.
Background technology
Currently, the main support system used for subway foundation pit is mainly armored concrete and steel pipe to support, especially
Steel pipe support therein is horizontally disposed with spacing and is often no more than 3m, but with the further development in subway field, foundation pit
Width is also increasing, and traditional support strength cannot meet the needs of subway foundation pit large span, in addition, narrow based on subway station
Long, rectangle flat shape feature, subway foundation pit earth excavation generally use step to move back the method for digging relay and carry out.Due to water
Too closely, operation side is small, and earth excavation machinery often uses the smaller excavating equipment of dipper capacity for the spacing of flat support setting,
Earth excavation is completed by way of step relay, greatly reduces earth excavation working efficiency；On the other hand, in steel pipe support
When being lifted by root, because of closeer horizontally-supported spacing, it is necessary to the mutual collision that supports when avoiding lifting, after lifting is in place it is still necessary to
It is supported end and is welded and fixed and supports pre-stress construction, support difficult to install, construction efficiency underground.
It is well known that pit earthwork excavates the principle progress that must comply with " first support and dig afterwards ", found by investigating, even if adopting
Earth excavation is carried out with the smaller digging machine of the relatively low dipper capacity of work efficiency, the installation efficiency of support far can not also meet earth excavation and want
It asks, no matter both earth excavation and support installation temporally and spatially cannot achieve mutual satisfaction, cause horizontally-supported
Installation often lags behind earth excavation, and huge security risk is buried for base pit engineering.
To sum up, it for the subway foundation pit engineering of current sleeve configuration rule, is opened using existing horizontal struts system and the earthwork
Excavation method causes engineering construction on duration and safety certain difficulty.
Invention content
The object of the present invention is to provide a kind of subway foundation pit large span support system and its construction methods, to solve existing base
The hole support technical problem that span is small, structural strength is low；And solve the problems, such as low construction efficiency.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of subway foundation pit large span support system, including the horizontal truss that is horizontally supported between foundation pit diaphram wall
Support unit, the horizontal truss support unit are uniformly distributed along the length and short transverse parallel interval of foundation pit, the water
Plane frame work support unit includes upper plane girder support, the connecting rod of lower plane truss support and vertical connection therebetween.
The upper plane girder support include two along foundation pit width direction be arranged to supportting steel truss, being connected to support steel
It fringe truss between truss both ends and is connected to the Chinese lute support on support steel truss both ends two sides.
The lower plane truss support is identical with upper plane girder support construction and parallel interval is arranged.
Described pair of support steel truss include it is parallel to support mobile jib and be connected to support mobile jib between to support 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 Chinese lute support mobile jib and connection Chinese lute between support steel truss and fringe truss
It supports mobile jib and the Chinese lute between support steel truss and fringe truss supports web member.
It is connected with lifting drive machine between the fringe truss and foundation pit diaphram wall of the horizontal truss support unit
Structure.
At least four groups of the lifting drive mechanism is symmetrically distributed in horizontal truss support unit both sides.
The lifting drive mechanism includes the jack for being connected to 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 idler wheel being hinged on rolling wheel support.
The rolling wheel support is that triangular plate either bends strip board at an acute angle, apex angle and cradle head be hinged,
Two base angles are symmetrically hinged, and there are one idler wheels.
A kind of construction method of subway foundation pit large span support system as mentioned, which is characterized in that be as follows：
Step 1, to support mobile jib, to support web member assembly to supportting steel truss.
Step 2, truss mobile jib, fringe truss web member assemble fringe truss.
Step 3, Chinese lute support mobile jib, Chinese lute support web member assembly Chinese lute support.
Step 4 is assembled into horizontal truss support unit to support steel truss, fringe truss and Chinese lute support successively assembly connection.
Horizontal truss support unit is integrally hung and is used as first layer at designed elevation position into subway foundation pit by step 5
Horizontal truss support unit.
Step 6 is accurate to adjust first layer horizontal truss support unit plan-position and verticality and fix.
Step 7 is excavated at the first layer soil body to designed elevation position.
Step 8 repeats step 1 to step 4, another horizontal truss support unit is integrally hung into subway foundation pit
Second layer horizontal truss support unit is used as at designed elevation position.
Step 9 is accurate to adjust second layer horizontal truss support unit plan-position and verticality and fix.
Step 10 is dropped to first layer horizontal truss support unit at designed elevation position using lifting drive mechanism.
Step 11 is accurate to adjust first layer horizontal truss support unit plan-position and verticality and fix.
Step 12 excavates the second layer soil body.
Step 13 repeats step 8 to step 12, until completing the earth excavation construction of subway foundation pit.
In the step 6, the both ends of first layer horizontal truss support unit correspond to be fixed at the top of subway foundation pit first
In Guan Liang and the second Guan Liang.
Compared with prior art the invention has the characteristics that and advantageous effect：
Present invention subway foundation pit construction different from the past, but by the way that the rectangle rule subway foundation pit of sleeve configuration to be divided into
Several units, each unit is by being arranged level support unit, before meeting subway foundation pit stability and Deformation control requirement
It putting, has the characteristics that assembled, large span, liftable so that subway foundation pit working space is big, construction efficiency higher,
It is proposed a kind of new support system and construction method for subway foundation pit construction field, be low-carbon, green, quickly, the construction of safety
Technology can accelerate earth excavation work efficiency, shorten the engineering construction duration, while by the integral elevating of level support unit, keeping away
Exempt from traditional subway foundation pit deep pit monitor hidden danger caused by cruelty construction cannot follow the principle for first supportting and digging afterwards.
In the construction process, level support unit is first mounted on designed elevation 1, then the corresponding soil body of stage excavation, then
Level support unit is dropped into designed elevation 2 by lifting power plant using guide rail, again the corresponding soil body of stage excavation, this
Sample and so on, until bottom construction is completed, construction efficiency is high, and the earth excavation for being suitable for deep basal pit is constructed, in addition, horizontally-supported
Unit uses space truss type structure, and structural strength is high, is meeting subway foundation pit stability and deformation using this support system
Control also has the characteristics that large span while require, and the size with subway foundation pit both direction is respectively 18m, for 23m,
Within the scope of support system, the headroom of about 13m × 16m is formd, large-scale working face can be provided and made for backacter machine
Industry space, and using the lifting of lifting drive unit matching guide rail completion level support unit, 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 schematic diagram of horizontal truss support unit of the present invention.
Fig. 2 is design structure schematic diagram before present invention construction.
Fig. 3 is the status diagram of the step five of the present invention.
Fig. 4 is the status diagram of the step seven of the present invention.
Fig. 5 is the status diagram of the step ten one of the present invention.
Fig. 6 is the status diagram of the step ten two of the present invention.
Fig. 7 is the structural schematic diagram of lifting drive mechanism of the present invention.
Reference numeral：1- connects support steel truss, 2- fringe trusses, the support of 3- Chinese lute, 4- subway foundation pits, the first undergrounds 5-
Continuous wall, the second diaphram walls of 6-, the first Guan Liangs of 7-, the second Guan Liangs of 8-, 9- first layer horizontal truss support unit, 10-
Lifting drive mechanism, the first layer soil bodies of 11-, 12- second layer horizontal truss support unit, the first layer soil bodies of 13-, 14- idler wheels,
15- jack, 16- cradle heads, 17- rolling wheel supports.
Specific implementation mode
Embodiment is shown in Figure 1, and in this example, the size of subway foundation pit both direction is respectively 18m, 23m；In supporter
Be to form the headroom of about 13m × 16m in range, medium-sized backacter can direct operation within this range, be relatively arranged
Conventional inner support expands excavation range, and subway foundation pit construction efficiency can be improved.After fortune is dug in the earthwork, pass through lifting drive mechanism
Horizontal truss support system is dropped quickly into designed elevation, improves support installation effectiveness.
This subway foundation pit large span support system, including the horizontal truss that is horizontally supported between foundation pit diaphram wall
Support unit, the horizontal truss support unit are uniformly distributed along the length and short transverse parallel interval of foundation pit, the water
Plane frame work support unit includes upper plane girder support, the connecting rod of lower plane truss support and vertical connection therebetween.
It is shown in Figure 1, the upper plane girder support include two along foundation pit width direction be arranged to support steel truss
1, it is connected to supportting the fringe truss 2 between 1 both ends of steel truss and being connected to the Chinese lute support 3 on 1 both ends two sides of support steel truss；
The lower plane truss support is identical with upper plane girder support construction and parallel interval is arranged.
Described pair of support steel truss 1 include it is parallel to support mobile jib and be connected between support mobile jib to supportting web member；It is 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 includes oblique
Mobile jib and connection Chinese lute support mobile jib are supportted to being arranged in the Chinese lute between support steel truss 1 and fringe truss 2 and to support steel truss 1 and side
Chinese lute between truss 2 supports web member.
It is shown in Figure 7, it is connected with liter between the fringe truss 2 and foundation pit diaphram wall of the horizontal truss support unit
Actuating unit 10 drops；Between the upper plane girder support of the horizontal truss support unit, the both ends of lower plane truss support
Interval is 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, six groups are connected per side；The lifting drive mechanism 10 includes being connected to the very heavy of horizontal truss support unit end
It pushes up the 15, cradle head 16 for being connected to jack front end, the rolling wheel support 17 being hinged on cradle head 16 and is hinged on idler wheel
Idler wheel 14 on holder 17；The rolling wheel support 17 is that triangular plate either bends strip board at an acute angle, apex angle with turn
Idler wheel 14 there are one movable joint 16 is hinged, two base angles are symmetrically hinged.
A kind of construction method of subway foundation pit large span support system as mentioned, which is characterized in that be as follows：
Step 1, to support mobile jib, to support web member assembly to supportting steel truss.
Step 2, truss mobile jib, fringe truss web member assemble fringe truss.
Step 3, Chinese lute support mobile jib, Chinese lute support web member assembly Chinese lute support.
Step 4 is assembled into horizontal truss support unit to support steel truss, fringe truss and Chinese lute support successively assembly connection.
Step 5, it is shown in Figure 3, horizontal truss support unit is integrally hung into subway foundation pit 4 designed elevation 1
It sets place and is used as first layer horizontal truss support unit 9.
Step 6 is accurate to adjust 9 plan-position of first layer horizontal truss support unit and verticality and fix.
Step 7, it is shown in Figure 4, it excavates at the first layer soil body 11 to 2 position of designed elevation.
Step 8 repeats step 1 to step 4, another horizontal truss support unit is integrally hung into subway foundation pit 4
Second layer horizontal truss support unit 12 is used as at 1 position of designed elevation.
Step 9 is accurate to adjust 12 plan-position of second layer horizontal truss support unit and verticality and fix.
First layer horizontal truss support unit 9 is dropped to 2 position of designed elevation by step 10 using lifting drive mechanism 10
Place.
Step 11, it is shown in Figure 5, it is accurate adjust 9 plan-position of first layer horizontal truss support unit and verticality,
And it is fixed.
Step 12, it is shown in Figure 6, excavate the second layer soil body 13.
Step 13 repeats step 8 to step 12, until completing the earth excavation construction of subway foundation pit 4.
In the step 6, the both ends of first layer horizontal truss support unit 9 correspond to the be fixed at the top of subway foundation pit
In one Guan Liang 7 and the second Guan Liang 8.
Claims (7)
1. a kind of subway foundation pit large span support system, including the horizontal truss branch that is horizontally supported between foundation pit diaphram wall
Unit is supportted, the horizontal truss support unit is uniformly distributed along the length and short transverse parallel interval of foundation pit, and feature exists
In：The horizontal truss support unit includes upper plane girder support, lower plane truss support and is connected to the two vertically
Between connecting rod；
The upper plane girder support include two along foundation pit width direction be arranged to support steel truss（1）, be connected to support steel
Truss（1）Fringe truss between both ends（2）Be connected to support steel truss（1）Chinese lute support on the two sides of both ends（3）；
The lower plane truss support is identical with upper plane girder support construction and parallel interval is arranged；
The fringe truss of the horizontal truss support unit（2）Lifting drive mechanism is connected between foundation pit diaphram wall
（10）；
Described pair of support steel truss（1）Including it is parallel to support mobile jib and be connected to support mobile jib between to support web member；
The fringe truss（2）Including the fringe truss web member between parallel fringe truss mobile jib and connection fringe truss mobile jib.
2. subway foundation pit large span support system according to claim 1, it is characterised in that：The Chinese lute support（3）Including
It is 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.
3. subway foundation pit large span support system according to claim 1 or 2, it is characterised in that：The lifting drive machine
Structure（10）At least four groups, be symmetrically distributed in horizontal truss support unit both sides.
4. subway foundation pit large span support system according to claim 3, it is characterised in that：The lifting drive mechanism
（10）Jack including being connected to 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 idler wheel（14）.
5. subway foundation pit large span support system according to claim 4, it is characterised in that：The rolling wheel support（17）For
Triangular plate either bends strip board at an acute angle, apex angle and cradle head（16）Hinged, two base angles are symmetrically hinged with one
A idler wheel（14）.
6. a kind of construction method of subway foundation pit large span support system as described in claim 4 or 5 any one, feature
It is, is as follows：
Step 1, to support mobile jib, to support web member assembly to supportting steel truss；
Step 2, truss mobile jib, fringe truss web member assemble fringe truss；
Step 3, Chinese lute support mobile jib, Chinese lute support web member assembly Chinese lute support；
Step 4 is assembled into horizontal truss support unit to support steel truss, fringe truss and Chinese lute support successively assembly connection；
Step 5 integrally hangs horizontal truss support unit to subway foundation pit（4）Middle designed elevation（1）As first at position
Layer horizontal truss support unit（9）；
Step 6 is accurate to adjust first layer horizontal truss support unit（9）Plan-position and verticality are simultaneously fixed；
Step 7 excavates the first layer soil body（11）To designed elevation（2）At position；
Step 8 repeats step 1 to step 4, another horizontal truss support unit is integrally hung to subway foundation pit（4）In set
It counts and is used as second layer horizontal truss support unit at 1 position of absolute altitude（12）；
Step 9 is accurate to adjust second layer horizontal truss support unit（12）Plan-position and verticality are simultaneously fixed；
Step 10 utilizes lifting drive mechanism（10）By first layer horizontal truss support unit（9）Drop to 2 position of designed elevation
Place；
Step 11 is accurate to adjust first layer horizontal truss support unit（9）Plan-position and verticality are simultaneously fixed；
Step 12 excavates the second layer soil body（13）；
Step 13 repeats step 8 to step 12, until completing subway foundation pit（4）Earth excavation construction.
7. construction method according to claim 6, it is characterised in that：In the step 6, the support of first layer horizontal truss
Unit（9）Both ends correspond to and be fixed on the first Guan Liang at the top of subway foundation pit（7）With the second Guan Liang（8）On.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN106436718A CN106436718A (en) | 2017-02-22 |
| CN106436718B true CN106436718B (en) | 2018-11-09 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN111962530B (en) * | 2020-09-18 | 2024-10-01 | 上海巨鲲科技有限公司 | Side truss steel support system |
| CN113389204B (en) * | 2021-06-29 | 2023-03-17 | 上海隧道工程有限公司 | Construction method of deep foundation pit sliding type rapid pre-support system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63528A (en) * | 1986-06-20 | 1988-01-05 | Marukiyou Koumushiyo:Kk | Supporting and take-down type structure for shore strut |
| KR20050010616A (en) * | 2003-07-21 | 2005-01-28 | 김정균 | transverse truss strutting method for construction and structure thereof |
| JP4960969B2 (en) * | 2005-11-16 | 2012-06-27 | サポーテック カンパニー リミテッド | Temporary retaining device |
| CN103334439B (en) * | 2013-06-06 | 2015-06-24 | 广西建工集团第五建筑工程有限责任公司 | Long-span reinforced concrete inner support structure of rectangular deep foundation pit and construction method of structure |
| CN104196032A (en) * | 2014-08-12 | 2014-12-10 | 上海隧道工程有限公司 | Subway station supporting plate and inversed operation combined construction method |
| CN204456139U (en) * | 2015-02-02 | 2015-07-08 | 北京建筑大学 | A kind of foundation pit enclosure structure |
| CN204590041U (en) * | 2015-04-23 | 2015-08-26 | 浙江大学城市学院 | A kind of foundation pit enclosure structure |
| CN206034461U (en) * | 2016-09-09 | 2017-03-22 | 中建三局集团有限公司 | Subway foundation pit large -span support system |
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