CN110258580A - A kind of construction method of the foundation pit enclosure structure as permanent underground structure - Google Patents
A kind of construction method of the foundation pit enclosure structure as permanent underground structure Download PDFInfo
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- CN110258580A CN110258580A CN201910520021.9A CN201910520021A CN110258580A CN 110258580 A CN110258580 A CN 110258580A CN 201910520021 A CN201910520021 A CN 201910520021A CN 110258580 A CN110258580 A CN 110258580A
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- internal layer
- foundation pit
- building enclosure
- retaining
- plate
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Foundations (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to a kind of construction methods of foundation pit enclosure structure as permanent underground structure comprising following steps: two layers of retaining-plate are arranged in the edge of foundation pit predeterminated position construction internal layer building enclosure, and in the outside of internal layer building enclosure；Stress relief valve is set between internal layer building enclosure and two layers of supporting plate；Inner support is installed during excavation pit, the inner surface in internal layer building enclosure is shored at the both ends of inner support respectively；During excavation pit, the deflection of internal layer building enclosure is controlled by adjusting the axial force of the supports of inner support, two layers of retaining-plate are made to support the soil body on the outside of it by the stress that proof stress adjusts valve simultaneously, to control the shift amount of the soil body on the outside of two layers of retaining-plate.Inner support is matched with Stress relief valve, in the case where effectively control thick-layer caving ground deformation, maintains original spatiality of building enclosure to greatest extent, ensure that internal layer building enclosure does not generate over-large displacement because controlling unstable soil layer deformation.
Description
Technical field
The present invention relates to Underground Construction field, especially a kind of foundation pit enclosure structure as permanent underground structure
Construction method.
Background technique
In high-speed rail station, subway station and single building process of construction, excavation of foundation pit is the construction technology generallyd use,
With the promotion of superstructure construction technique and the increase of Application in Underground Space demand, excavation of foundation pit depth is also deeper and deeper.By
The influence of building yard topography and geomorphology, excavation of foundation pit generally require again the stratum such as thick banket, weak soil, muck soil, swelled ground
Middle progress, above-mentioned stratum soil body stability is poor, is influenced by ambient enviroment and weather, and biggish displacement deformation easily occurs, right
The stability of foundation pit periphery existing building has an impact.
According to work present situation, the stability of existing building and the foundation pit periphery soil body is mainly heavy by establishing on foundation pit periphery
Drop system for monitoring displacement measures.When the land movement of foundation pit periphery is excessive, when existing building sedimentation and deformation reaches early warning value, mostly use
Two kinds for the treatment of measures.First is that adjustment foundation pit enclosure structure inner support axle power, by the increase or reduction of axial force of the supports, drive is gone along with sb. to guard him
Structure is subjected to displacement, to control the displacement of the foundation pit periphery soil body.Another is passed through in peripheral distortion soil internal injection
The stability control of the realization foundation pit periphery soil body such as slurry consolidation.Existing method application is universal, but because building enclosure is mostly conduct
A part of ready-built structure permanently uses in foundation pit, the situation larger for caving ground thickness, soil deformation is excessive, when
When axial force of the supports is larger, larger displacement, which can also occur, for building enclosure can meet the demand for control of soil deformation, be easy to going along with sb. to guard him
Itself integrality of structure or safety damage, and influence that its later period is practical, hide some dangers for for the safe operation of underground structure.
Slip casting method is changed the original structure of foundation soil, is on the one hand not easy to the second development and utilization in foundation pit periphery soil body later period,
On the other hand its treatment effect is irreversible, relatively difficult to achieve if the later period needs reverse adjustment treatment effect.
Summary of the invention
The purpose of the present invention is provide a kind of foundation pit as permanent underground structure according to above-mentioned the deficiencies in the prior art
The construction method of building enclosure, by the way that two layers of retaining-plate and Stress relief are arranged in the outside of original internal layer building enclosure
Valve is preventing the land movement of foundation pit periphery excessive simultaneously, controls the deformation extent of internal layer enclosed structure.
The object of the invention realization is completed by following technical scheme:
A kind of construction method of the foundation pit enclosure structure as permanent underground structure comprising following steps: position is preset in foundation pit
The edge construction internal layer building enclosure set, and two layers of retaining-plate are set in the outside of the internal layer building enclosure；In the internal layer
Stress relief valve is set between building enclosure and two layers of supporting plate；Excavation pit is pacified inside the foundation pit in digging process
Inner support is filled, the inner surface in the internal layer building enclosure is shored at the both ends of the inner support respectively；In the process of excavation pit
In, the deflection of the internal layer building enclosure is controlled by adjusting the axial force of the supports of the inner support, while passing through control institute
The stress for stating Stress relief valve makes two layers of retaining-plate support the soil body on the outside of it, to control on the outside of two layers of retaining-plate
The soil body shift amount.
The process of two layers of retaining-plate of the internal layer building enclosure of constructing and setting is the following steps are included: make the internal layer
The steel reinforcement cage of building enclosure, and one layer of retaining-plate is installed in the outside of the steel reinforcement cage；Successively pacify in the outside of one layer of retaining-plate
Fill the Stress relief valve and two layers of retaining-plate；Groove is excavated at the edge of foundation pit predeterminated position, by the steel reinforcement cage
It is placed in the groove, and is poured concrete to form internal layer building enclosure.
The inner support includes support rod and axial force of the supports adjustment valve；It, will be described during the inner support is installed
Axial force of the supports adjustment valve is mounted on the first end of the support rod；Axial force of the supports adjustment valve is resisted against the internal layer to go along with sb. to guard him
The inner surface of structure, and the second end of the support rod is resisted against to the inner surface of the internal layer building enclosure.
The axial force of the supports adjustment valve is connected with axial force of the supports reading table, during excavating the foundation pit, passes through institute
The axial force of the supports that axial force of the supports reading table measures the inner support is stated, and the axial force of the supports is controlled according to axial force of the supports and is adjusted
Valve, to control the deflection of the internal layer building enclosure.
The Stress relief valve is connected with stress reading table；During excavating the foundation pit, the foundation pit periphery is detected
The soil body displacement, the stress of the Stress relief valve is measured by the stress reading table, and according to the stress detected
And displacement controls two layers of retaining-plate described in the Stress relief valve pushing tow, to control the soil body on the outside of two layers of retaining-plate
Shift amount.
After the completion of the excavation of foundation pit, using the internal layer building enclosure as permanent underground structure.
The invention has the advantages that by two layers of retaining-plate of setting and Stress relief valve, by the unstable soil layer of thick-layer to base
The active force of pit enclosure structure is buffered.Inner support is matched with Stress relief valve, in effectively control thick-layer caving ground
In the case where deformation, original spatiality of building enclosure is maintained to greatest extent, ensure that internal layer building enclosure not because of control
Unstable soil layer deforms and generates over-large displacement, makes the essential function of its building enclosure of bringing into play, so that internal layer building enclosure can
As the permanent underground structure of construction project to be built a part and be used for a long time.In addition, in Excavation Process, internal layer building enclosure
Deformation it is smaller, can avoid internal layer enclosed structure collapse, ensure that the life security of operating personnel.
Detailed description of the invention
Fig. 1 is the schematic diagram of foundation pit side-wall Stress relief system；
Fig. 2 is the side view of steel reinforcement cage；
Fig. 3 is the top view of steel reinforcement cage；
Fig. 4 is the front view of steel reinforcement cage；
Fig. 5 is the schematic cross-section of foundation trench.
Specific embodiment
Feature of present invention and other correlated characteristics are described in further detail by embodiment below in conjunction with attached drawing, so as to
In the understanding of technical staff of the same trade:
As shown in Figs. 1-5,1-16 is marked to respectively indicate in figure are as follows: foundation pit 1, internal layer building enclosure 2, two layers of retaining-plate 3, stress tune
Whole valve 4,5, one layers of retaining-plate 6 of inner support, stress reading table 7, support rod 8, axial force of the supports adjustment valve 9, axial force of the supports read table
10, deep caving ground 11, opposite good ground 12, foundation trench 13, steel reinforcement cage 14, top section 15, bottom section 16.
Embodiment: as shown in Figure 1, the construction method of the foundation pit enclosure structure as permanent underground structure of the present embodiment is adopted
It is constructed with foundation pit side-wall Stress relief system.The foundation pit side-wall Stress relief system includes 2, two layers of branch of internal layer building enclosure
Backplate 3, inner support 5 and several Stress relief valves 4.In the present embodiment, internal layer building enclosure 2 and underground in the prior art connect
Continuous wall wall is similar, goes along with sb. to guard him in the side of subterranean excavation 1.The main body of internal layer building enclosure 2 is reinforced concrete structure.Internal layer is gone along with sb. to guard him
The inside of structure 2 is provided with multiple tracks inner support 5, and the inner surface in internal layer building enclosure 2 is shored at the both ends of inner support 5, with control
The deflection of internal layer building enclosure 2.The outside of internal layer building enclosure 2 is arranged in two layers of retaining-plate 3 parallel；Stress relief valve 4 is set
It sets between internal layer building enclosure 2 and two layers of retaining-plate, Stress relief valve 4 is by two layers of retaining-plate 3 of pushing tow to control two layers of branch
The shift amount of the soil body in 3 outside of backplate.Inner support 5 is matched with Stress relief valve 4, is preventing internal layer building enclosure 2 from deforming
Meanwhile it can also prevent the soil layer outside foundation pit 1 from sedimentation deformation occurs.
As shown in Fig. 1 to 5, the construction method of the foundation pit enclosure structure as permanent underground structure of the present embodiment is specifically wrapped
Include following steps:
(1) in the edge of 1 predeterminated position of foundation pit construction internal layer building enclosure 2, and it is arranged two layers in the outside of internal layer building enclosure 2
Retaining-plate 3；Stress relief valve 4 is set between internal layer building enclosure 2 and two layers of retaining-plate 3.
Specifically, need the exploration data according to construction site before construction, determine deep caving ground 11 and
The position of opposite good ground 12, so that it is determined that the vertical height of two layers of retaining-plate 3 and internal layer building enclosure 2, and determine each
Kind design parameter.
The process of two layers of retaining-plate 3 of construction internal layer building enclosure 2 and setting is specifically includes the following steps: production internal layer encloses
The steel reinforcement cage 14 of protection structure 2, and one layer of retaining-plate 6 is installed in the outside of steel reinforcement cage 14；Successively pacify in the outside of one layer of retaining-plate 6
Fill the Stress relief valve 4 and two layers of retaining-plate 3.
The inner surface of one layer of retaining-plate 6 is connect with the steel reinforcement cage of internal layer building enclosure 2.Stress relief valve 4 is shored at one layer
The outer surface of retaining-plate 6, one layer of retaining-plate 6 are made of steel plate, can prevent Stress relief valve 4 from abutting directly against internal layer and go along with sb. to guard him knot
On the concrete structure of structure 2, thus structural failure caused by preventing the outer surface local pressure of internal layer building enclosure 2 excessive.This
Outside, one layer of retaining-plate 6 can also play the role of template during pouring the concrete of internal layer building enclosure.
At least three Stress relief valves 4 are provided between two layers of retaining-plate 3 and internal layer building enclosure 2.Each Stress relief valve 4
It is connected with stress reading table 7.It can adjust two layers of retaining-plate 3 to the jacking force of the soil layer on the outside of it by each Stress relief valve 4.It is logical
Overstress reading table 7 can detect the stress of each Stress relief valve 4.
After steel reinforcement cage 14 completes, foundation trench 13 is excavated at the edge of foundation pit predeterminated position, steel reinforcement cage 14 is connected into same layer
6, two layers of retaining-plate 3 of retaining-plate and Stress relief valve 4 are placed in foundation trench together, and are poured concrete and are gone along with sb. to guard him knot to form internal layer
Structure 2.
Foundation trench 13 includes top section 15 and bottom section 16 from up to down, and the width in top section 15 is greater than bottom zone
Between 16 width, 15 foundation trench width of top section is slightly larger than two layers of retaining-plate 3, Stress relief valve 4 and internal layer building enclosure 2
Overall thickness, the depth in top section 15 are equal to the vertical height of two layers of retaining-plate 3, the aggregate depth in top section 15 and bottom section 16
Degree is equal to the vertical height of internal layer building enclosure 2.Top section 15 is divided into two by one layer of retaining-plate 6 in 14 outside of steel reinforcement cage
Point, the side in top section 15 is provided with steel reinforcement cage 14, and the other side is provided with Stress relief valve 4 and two layers of retaining-plate 3.Xiang Ji
In slot 13 during casting concrete, Concrete Filled includes the one of steel reinforcement cage 14 in bottom section 16 and top section 15
Side.Concrete wraps up steel reinforcement cage 14 and forms internal layer building enclosure.
(2) excavation pit, installs inner support in digging process inside foundation pit 1, and the both ends of inner support 5 are shored respectively
The inner surface of internal layer building enclosure 2；During excavation pit 1, by adjusting the axial force of the supports of inner support 5 to control internal layer
The deflection of building enclosure 2, while making two layers of retaining-plate 3 support the soil on the outside of it by the stress that proof stress adjusts valve 4
Body, to control the shift amount of the soil body in two layers of retaining-plate, 3 outside.
Inner support 5 is successively installed with the digging process of foundation pit 1.During inner support 5 is installed, axial force of the supports is adjusted
Valve 9 is mounted on the first end of support rod 8；Axial force of the supports adjustment valve 9 is resisted against to the inner surface of internal layer building enclosure 2, and will branch
The second end of strut 8 is resisted against the inner surface of internal layer building enclosure 2.Adjusting valve 9 by axial force of the supports can adjust inner support 5 to interior
The support force of layer building enclosure 2, to prevent internal layer building enclosure 2 to be deformed.It is detectable each that table 10 is read by axial force of the supports
The axial force of the supports of inner support 5.
Stress relief valve 4 and axial force of the supports adjustment valve 9 are all made of hydraulic technique and generate jacking force, and the two is built-in with oil
Pressure adjustment mouth and top power device.The existing technology in market and product can be used in Stress relief valve 4 and axial force of the supports adjustment valve 9.
Axial force of the supports adjustment valve 9 is connected with axial force of the supports reading table 10, and Stress relief valve 4 is connected with stress reading table 7.?
During excavation pit 1, the axial force of the supports of each inner support 5 is measured by axial force of the supports reading table 10, is read by stress
Table 7 measures the stress of Stress relief valve 4, while detecting the displacement of the soil body on 1 periphery of foundation pit.In digging process, according to support
The sedimentation deformation of axle power and foundation pit periphery soil layer controls the jacking force of the axial force of the supports adjustment valve 9, is gone along with sb. to guard him with controlling internal layer
The deflection of structure 2, while two layers of retaining-plate according to stress and displacement proof stress adjustment 4 pushing tow of valve detected
3, to control the shift amount of the soil body in two layers of retaining-plate, 3 outside.
(3) a part after the completion of excavation of foundation pit, by internal layer building enclosure 2 as permanent underground structure.
In the present embodiment, the vertical height of internal layer building enclosure 2 is greater than the vertical height of two layers of retaining-plate 3；Internal layer is gone along with sb. to guard him
The top sides of structure 2 are along concordant with the top sides of two layers of retaining-plate 3 edge.The most suitably used soil layer construction of the present embodiment is that upper layer is deep
Thick caving ground 11, and lower part is opposite good ground 12.Deep caving ground 11 refer to weak soil, swelled ground, miscellaneous fill,
The unstable stratum of some column properties such as collapsible loess, such stratum are influenced by external environments such as rainfalls, and shape easily occurs
The unstable displacements such as change.Deep caving ground 11 is easy to happen sedimentation deformation, in order to avoid its sedimentation deformation, two layers of retaining-plate
3 need to carry out pushing tow to it using biggish pressure.In order to apply enough pressure, two layers of supporting to deep caving ground 11
Plate 3 can carry out biggish displacement under the promotion of Stress relief valve 4, and the displacement range that two layers of retaining-plate 3 can be born is far longer than
The displacement that internal layer building enclosure 2 can be born.
It is deep caving ground 11 that the technical solution of the present embodiment, which is applicable not only to upper layer, and lower part is relatively steadily
The geological environment of layer 12, for other geological environments, the foundation pit side-wall Stress relief of the deep caving ground of the present embodiment
System can equally play good support action.
Although above embodiments elaborate the object of the invention conception and embodiment referring to attached drawing, ability
Domain those of ordinary skill will recognize, still can be to this in the case where no disengaging claim limits the precondition of range
Various modifications and variations are made in invention, therefore will not repeat them here.
Claims (6)
1. a kind of construction method of the foundation pit enclosure structure as permanent underground structure, which comprises the following steps:
The edge construction internal layer building enclosure of foundation pit predeterminated position, and two layers of retaining-plate are set in the outside of the internal layer building enclosure；
Stress relief valve is set between the internal layer building enclosure and two layers of supporting plate；Excavation pit, described in digging process
Inner support is installed, the inner surface in the internal layer building enclosure is shored at the both ends of the inner support respectively inside foundation pit；It is excavating
During foundation pit, the deflection of the internal layer building enclosure is controlled by adjusting the axial force of the supports of the inner support, simultaneously
Stress by controlling the Stress relief valve makes two layers of retaining-plate support the soil body on the outside of it, to control described two layers
The shift amount of the soil body on the outside of retaining-plate.
2. a kind of construction method of foundation pit enclosure structure as permanent underground structure according to claim 1, feature
It is, the internal layer building enclosure of constructing and the process that two layers of retaining-plate is arranged are enclosed the following steps are included: making the internal layer
The steel reinforcement cage of protection structure, and one layer of retaining-plate is installed in the outside of the steel reinforcement cage；It is successively installed in the outside of one layer of retaining-plate
The Stress relief valve and two layers of retaining-plate；Groove is excavated at the edge of foundation pit predeterminated position, the steel reinforcement cage is set
In the groove, and concrete is poured to form internal layer building enclosure.
3. a kind of construction method of foundation pit enclosure structure as permanent underground structure according to claim 1, feature
It is, the inner support includes support rod and axial force of the supports adjustment valve；During installing the inner support, by the support
Axle power adjustment valve is mounted on the first end of the support rod；Axial force of the supports adjustment valve is resisted against the internal layer building enclosure
Inner surface, and the second end of the support rod is resisted against to the inner surface of the internal layer building enclosure.
4. a kind of construction method of foundation pit enclosure structure as permanent underground structure according to claim 3, feature
It is, the axial force of the supports adjustment valve is connected with axial force of the supports reading table, during excavating the foundation pit, passes through the branch
Support axle power reading table measures the axial force of the supports of the inner support, and controls the axial force of the supports according to axial force of the supports and adjust valve, with
Control the deflection of the internal layer building enclosure.
5. a kind of construction method of foundation pit enclosure structure as permanent underground structure according to claim 1, feature
It is, the Stress relief valve is connected with stress reading table；During excavating the foundation pit, the soil on the foundation pit periphery is detected
The displacement of body, measures the stress of the Stress relief valve by the stress reading table, and according to the stress detected and
Displacement controls two layers of retaining-plate described in the Stress relief valve pushing tow, to control the shifting of the soil body on the outside of two layers of retaining-plate
Position amount.
6. a kind of construction method of foundation pit enclosure structure as permanent underground structure according to claim 1, feature
It is, after the completion of the excavation of foundation pit, using the internal layer building enclosure as permanent underground structure.
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| CN201910520021.9A CN110258580B (en) | 2019-06-17 | 2019-06-17 | Construction method of foundation pit enclosure structure serving as permanent underground structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111501860A (en) * | 2020-04-23 | 2020-08-07 | 腾达建设集团股份有限公司 | Foundation pit enclosure deformation control device and system |
| CN114673162A (en) * | 2022-04-15 | 2022-06-28 | 中铁上海设计院集团有限公司 | Underground vehicle base foundation pit construction method |
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| KR20140101191A (en) * | 2013-02-08 | 2014-08-19 | 조아현 | The Reinforced Stiffness Self-supporting Temporary Structure And Method Of The Same |
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