CN110258580B - Construction method of foundation pit enclosure structure serving as permanent underground structure - Google Patents
Construction method of foundation pit enclosure structure serving as permanent underground structure Download PDFInfo
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- CN110258580B CN110258580B CN201910520021.9A CN201910520021A CN110258580B CN 110258580 B CN110258580 B CN 110258580B CN 201910520021 A CN201910520021 A CN 201910520021A CN 110258580 B CN110258580 B CN 110258580B
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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
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- 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
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- 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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- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract
The invention relates to a construction method of a foundation pit support structure serving as a permanent underground structure, which comprises the following steps: constructing an inner-layer enclosure structure at the edge of a preset position of the foundation pit, and arranging a two-layer supporting and protecting plate on the outer side of the inner-layer enclosure structure; a stress adjusting valve is arranged between the inner layer enclosure structure and the two layers of support plates; installing an inner support in the process of excavating a foundation pit, wherein two ends of the inner support are respectively supported on the inner surface of the inner-layer enclosure structure; in the process of excavating the foundation pit, the deformation of the inner-layer enclosure structure is controlled by adjusting the supporting shaft force of the inner support, and meanwhile, the stress of the stress adjusting valve is controlled to enable the two-layer supporting plate to support the soil body on the outer side of the two-layer supporting plate so as to control the displacement amount of the soil body on the outer side of the two-layer supporting plate. The inner support is matched with the stress adjusting valve, so that the original space state of the enclosure structure is maintained to the maximum extent under the condition that deformation of a thick-layer unstable stratum is effectively controlled, and the inner-layer enclosure structure is prevented from generating overlarge displacement due to the fact that deformation of the unstable stratum is controlled.
Description
Technical Field
The invention relates to the field of underground structure construction, in particular to a construction method of a foundation pit enclosure structure which is also used as a permanent underground structure.
Background
In the construction process of high-speed railway stations, subway stations and single buildings, the excavation of the foundation pit is a commonly adopted construction process, and along with the improvement of the superstructure construction technology and the increase of the application requirements of underground spaces, the excavation depth of the foundation pit is deeper and deeper. The foundation pit excavation is often carried out in the stratums such as thick-layer filling soil, soft soil, mucky soil, expansive soil and the like under the influence of the landform and the landform of a building site, the stability of the soil body of the stratum is poor, and the foundation pit excavation is easily subjected to large displacement deformation under the influence of the surrounding environment and weather and influences the stability of the existing building at the periphery of the foundation pit.
According to the current working situation, the stability of the soil body around the existing building and the foundation pit is mainly measured by establishing a settlement displacement monitoring system around the foundation pit. When the displacement of the soil body around the foundation pit is too large and the settlement deformation of the existing building reaches an early warning value, two treatment measures are adopted. Firstly, support shaft force in the foundation pit support structure is adjusted, and the support shaft force is increased or reduced to drive the support structure to displace, so that the displacement of soil around the foundation pit is controlled. And the other method is to perform grouting in the peripheral deformed soil body and realize stability control of the soil body around the foundation pit through slurry consolidation and the like. The existing method is generally applied, but because the enclosure structure is mostly used as a part of a proposed structure in a foundation pit for permanent use, aiming at the conditions that the thickness of an unstable ground layer is larger and the deformation of a soil body is overlarge, when the supporting axial force is larger, the enclosure structure can also generate larger displacement so as to meet the control requirement of the deformation of the soil body, the integrity or the safety of the enclosure structure is easily damaged, the later practical effect is influenced, and hidden troubles are buried for the safe operation of an underground structure. The grouting method changes the original structure of the foundation soil, is not convenient for secondary development and utilization in the later stage of the soil body around the foundation pit on the one hand, and has irreversible treatment effect on the other hand, and is difficult to realize if reverse adjustment treatment effect is needed in the later stage.
Disclosure of Invention
The invention aims to provide a construction method of a foundation pit enclosure structure serving as a permanent underground structure, which is characterized in that a second layer of supporting plate and a stress adjusting valve are arranged on the outer side of the original inner layer enclosure structure, so that the deformation degree of the inner layer maintenance structure is controlled while the overlarge displacement of the soil body around the foundation pit is prevented.
The purpose of the invention is realized by the following technical scheme:
a construction method of a foundation pit enclosure structure which is also used as a permanent underground structure comprises the following steps: constructing an inner-layer enclosure structure at the edge of a preset position of a foundation pit, and arranging a second-layer supporting plate outside the inner-layer enclosure structure; a stress adjusting valve is arranged between the inner layer enclosing structure and the two layers of support plates; excavating a foundation pit, wherein an inner support is arranged in the foundation pit in the excavation process, and two ends of the inner support are respectively propped against the inner surface of the inner-layer enclosure structure; in the process of excavating the foundation pit, the deformation of the inner-layer enclosure structure is controlled by adjusting the supporting shaft force of the inner support, and meanwhile, the soil body on the outer side of the second-layer support plate is supported by the second-layer support plate by controlling the stress of the stress adjusting valve, so that the displacement of the soil body on the outer side of the second-layer support plate is controlled.
The process of constructing the inner-layer enclosure structure and arranging the second-layer supporting and protecting plate comprises the following steps: manufacturing a steel reinforcement cage of the inner-layer enclosure structure, and installing a first-layer supporting plate on the outer side of the steel reinforcement cage; the stress adjusting valve and the second layer of supporting and protecting plate are sequentially arranged on the outer side of the first layer of supporting and protecting plate; and excavating a groove at the edge of a preset position of the foundation pit, placing the reinforcement cage in the groove, and pouring concrete to form an inner-layer enclosure structure.
The inner support comprises a support rod and a support axial force adjusting valve; during the process of mounting the inner support, mounting the support shaft force adjusting valve at the first end of the support rod; and abutting the support shaft force adjusting valve against the inner surface of the inner-layer enclosure structure, and abutting the second end of the support rod against the inner surface of the inner-layer enclosure structure.
The supporting shaft force adjusting valve is connected with a supporting shaft force reading meter, and in the process of excavating the foundation pit, the supporting shaft force of the inner support is measured through the supporting shaft force reading meter, and the supporting shaft force adjusting valve is controlled according to the supporting shaft force so as to control the deformation of the inner layer enclosure structure.
The stress adjusting valve is connected with a stress reading meter; and in the process of excavating the foundation pit, detecting the displacement of soil around the foundation pit, measuring the stress of the stress regulating valve through the stress reading meter, and controlling the stress regulating valve to push the second layer of supporting plate according to the detected stress and the displacement so as to control the displacement of the soil outside the second layer of supporting plate.
And after the foundation pit is excavated, taking the inner-layer enclosure structure as a permanent underground structure.
The invention has the advantages that: through setting up second floor supporting plate and stress adjustment valve, cushion foundation pit envelope's effort with the unstable soil layer of thick layer. The inner support is matched with the stress adjusting valve, so that the original space state of the enclosure structure is maintained to the maximum extent under the condition of effectively controlling the deformation of the thick unstable stratum, the inner-layer enclosure structure is prevented from generating overlarge displacement due to the control of the deformation of the unstable stratum, the essential function of the enclosure structure is well exerted, and the inner-layer enclosure structure can be used for a long time as a part of a planned engineering permanent underground structure. In addition, in the excavation process of the foundation pit, the deformation of the inner layer enclosing structure is small, the collapse of the inner layer maintenance structure can be avoided, and the life safety of operators is guaranteed.
Drawings
FIG. 1 is a schematic view of a foundation pit sidewall stress adjustment system;
FIG. 2 is a side view of the reinforcement cage;
FIG. 3 is a top view of the reinforcement cage;
FIG. 4 is a front view of a reinforcement cage;
fig. 5 is a schematic cross-sectional view of the base groove.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
as shown in fig. 1-5, the symbols 1-16 are respectively shown as: the foundation pit supporting structure comprises a foundation pit 1, an inner layer enclosing structure 2, a second layer supporting and protecting plate 3, a stress adjusting valve 4, an inner support 5, a first layer supporting and protecting plate 6, a stress reading meter 7, a supporting rod 8, a supporting axial force adjusting valve 9, a supporting axial force reading meter 10, a deep unstable stratum 11, a relatively stable stratum 12, a foundation trench 13, a reinforcement cage 14, a top interval 15 and a bottom interval 16.
Example (b): as shown in fig. 1, the construction method of the foundation pit support structure doubling as the permanent underground structure of the embodiment adopts a foundation pit side wall stress adjustment system for construction. The foundation pit side wall stress adjusting system comprises an inner layer enclosure structure 2, a second layer supporting plate 3, an inner support 5 and a plurality of stress adjusting valves 4. In this embodiment, the inner enclosure structure 2 is similar to the underground diaphragm wall in the prior art, and is enclosed at the side of the underground foundation pit 1. The main body of the inner-layer building envelope 2 is of a reinforced concrete structure. The inner side of the inner-layer building envelope 2 is provided with a plurality of inner supports 5, and two ends of each inner support 5 are propped against the inner surface of the inner-layer building envelope 2 so as to control the deformation of the inner-layer building envelope 2. The second layer of supporting and protecting plates 3 are arranged outside the inner layer of envelope structure 2 in parallel; the stress adjusting valve 4 is arranged between the inner-layer enclosure structure 2 and the second-layer supporting plate, and the stress adjusting valve 4 controls the displacement amount of soil outside the second-layer supporting plate 3 by pushing the second-layer supporting plate 3. The inner support 5 is matched with the stress adjusting valve 4, so that the inner layer enclosure structure 2 is prevented from deforming, and meanwhile, the soil layer outside the foundation pit 1 can be prevented from settling and displacing.
As shown in fig. 1 to 5, the construction method of the foundation pit enclosure doubling as a permanent underground structure of the embodiment specifically includes the following steps:
(1) constructing an inner-layer enclosure structure 2 at the edge of a preset position of the foundation pit 1, and arranging a second-layer supporting plate 3 on the outer side of the inner-layer enclosure structure 2; and a stress adjusting valve 4 is arranged between the inner-layer building envelope 2 and the second-layer supporting plate 3.
Specifically, before construction, the positions of the deep unstable stratum 11 and the relatively stable stratum 12 are determined according to exploration data of a construction site, so that the vertical heights of the second-layer supporting plate 3 and the inner-layer enclosure structure 2 are determined, and various design parameters are determined.
The process of constructing the inner-layer building envelope 2 and arranging the second-layer supporting and protecting plate 3 specifically comprises the following steps: manufacturing a reinforcement cage 14 of the inner-layer enclosure structure 2, and installing a first-layer support guard plate 6 on the outer side of the reinforcement cage 14; the stress adjustment valve 4 and the second layer retainer plate 3 are attached to the outer side of the first layer retainer plate 6 in this order.
The inner surface of the first layer of support guard plate 6 is connected with the reinforcement cage of the inner layer of enclosure structure 2. The stress adjusting valve 4 is supported on the outer surface of the first layer of supporting plate 6 in a propping mode, the first layer of supporting plate 6 is made of steel plates, the stress adjusting valve 4 can be prevented from being directly abutted against a concrete structure of the inner-layer enclosure structure 2, and therefore structural damage caused by overlarge local pressure of the outer surface of the inner-layer enclosure structure 2 is prevented. In addition, the first layer of support and protection plate 6 can also play a role of a template in the process of pouring the concrete of the inner layer of the building envelope.
At least three stress adjusting valves 4 are arranged between the second layer of supporting plate 3 and the inner layer of envelope structure 2. A stress reading meter 7 is connected to each stress adjustment valve 4. The pushing force of the second layer supporting plate 3 to the soil layer outside thereof can be adjusted by each stress adjusting valve 4. The stress of each stress adjustment valve 4 can be detected by the stress reading meter 7.
After the reinforcement cage 14 is manufactured, a foundation trench 13 is excavated at the edge of a preset position of a foundation pit, the reinforcement cage 14, the first layer of support guard plate 6, the second layer of support guard plate 3 and the stress adjusting valve 4 are placed in the foundation trench together, and concrete is poured to form the inner layer enclosure structure 2.
The foundation trench 13 comprises a top section 15 and a bottom section 16 from top to bottom, the width of the top section 15 is larger than that of the bottom section 16, the width of the top section 15 is slightly larger than the total thickness of the second layer of supporting plate 3, the stress regulating valve 4 and the inner layer enclosure structure 2, the depth of the top section 15 is equal to the vertical height of the second layer of supporting plate 3, and the total depth of the top section 15 and the bottom section 16 is equal to the vertical height of the inner layer enclosure structure 2. The first layer of supporting plate 6 on the outer side of the reinforcement cage 14 divides the top section 15 into two parts, one side of the top section 15 is provided with the reinforcement cage 14, and the other side is provided with the stress adjusting valve 4 and the second layer of supporting plate 3. During the pouring of concrete into the foundation trench 13, the concrete fills the bottom section 16 and the top section 15 on the side containing the reinforcement cage 14. The concrete wraps around the reinforcement cage 14 to form an inner envelope.
(2) Excavating a foundation pit, mounting an inner support in the foundation pit 1 in the excavation process, and respectively supporting the two ends of the inner support 5 against the inner surface of the inner-layer enclosure structure 2; in the process of excavating the foundation pit 1, the deformation of the inner-layer enclosure structure 2 is controlled by adjusting the supporting shaft force of the inner support 5, and meanwhile, the soil body on the outer side of the second-layer support plate 3 is supported by controlling the stress of the stress adjusting valve 4, so that the displacement of the soil body on the outer side of the second-layer support plate 3 is controlled.
The inner supports 5 are installed layer by layer along with the excavation process of the foundation pit 1. In the process of mounting the inner support 5, a support axial force adjusting valve 9 is mounted at a first end of a support rod 8; and abutting the support shaft force adjusting valve 9 against the inner surface of the inner-layer building envelope 2, and abutting the second end of the support rod 8 against the inner surface of the inner-layer building envelope 2. The supporting force of the inner support 5 to the inner enclosure structure 2 can be adjusted through the supporting shaft force adjusting valve 9 so as to prevent the inner enclosure structure 2 from deforming. The support axial force of each inner support 5 can be detected by the support axial force reading meter 10.
Both the stress adjustment valve 4 and the support shaft force adjustment valve 9 generate a thrust force by using a hydraulic technique, and both have a hydraulic pressure adjustment port and a thrust device built therein. The stress adjustment valve 4 and the support shaft force adjustment valve 9 may be manufactured by using commercially available techniques and products.
The support shaft force adjusting valve 9 is connected with a support shaft force reading meter 10, and the stress adjusting valve 4 is connected with a stress reading meter 7. In the process of excavating the foundation pit 1, the supporting shaft force of each inner support 5 is measured through a supporting shaft force reading meter 10, the stress of a stress adjusting valve 4 is measured through a stress reading meter 7, and meanwhile, the displacement of the soil body around the foundation pit 1 is detected. In the excavation process, the jacking force of the supporting axial force adjusting valve 9 is controlled according to the supporting axial force and the settlement displacement of the soil layer around the foundation pit so as to control the deformation of the inner-layer enclosure structure 2, and meanwhile, the stress adjusting valve 4 is controlled according to the detected stress and the displacement to jack the second-layer supporting plate 3 so as to control the displacement of the soil body outside the second-layer supporting plate 3.
(3) And after the foundation pit is excavated, taking the inner-layer enclosure structure 2 as a part of the permanent underground structure.
In the embodiment, the vertical height of the inner-layer enclosure structure 2 is greater than that of the second-layer supporting plate 3; the top edge of the inner-layer building envelope 2 is flush with the top edge of the second-layer supporting plate 3. The soil structure most suitable for this embodiment is a deep unstable formation 11 on the upper layer and a relatively stable formation 12 on the lower layer. The deep unstable stratum 11 refers to a series of strata with unstable properties, such as soft soil, expansive soil, miscellaneous fill, collapsible loess, and the like, which are affected by external environments such as rainfall, and are easy to generate unstable displacement such as deformation. The deep unstable formation 11 is prone to sedimentation displacement, and in order to avoid the sedimentation displacement, the second layer of supporting and protecting plates 3 need to be pushed by adopting larger pressure. In order to apply enough pressure to the deep unstable stratum 11, the second layer of supporting plate 3 can be pushed by the stress adjusting valve 4 to perform larger displacement, and the displacement range which can be borne by the second layer of supporting plate 3 is far larger than that which can be borne by the inner layer of enclosure structure 2.
The technical scheme of this embodiment not only is applicable to the geological environment that the upper strata is deep unstable stratum 11, and the lower part is relatively stable stratum 12, and to other geological environment, the deep unstable stratum's of this embodiment foundation ditch lateral wall stress adjustment system can play good supporting effect equally.
Although the present invention has been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, they are not to be considered repeated herein.
Claims (6)
1. A construction method of a foundation pit enclosure structure used as a permanent underground structure is characterized by comprising the following steps: constructing an inner-layer enclosure structure at the edge of a preset position of a foundation pit, and arranging a second-layer supporting plate outside the inner-layer enclosure structure; a stress adjusting valve is arranged between the inner layer enclosure structure and the second layer supporting plate; excavating a foundation pit, wherein an inner support is arranged in the foundation pit in the excavation process, and two ends of the inner support are respectively propped against the inner surface of the inner-layer enclosure structure; in the process of excavating the foundation pit, the deformation of the inner-layer enclosure structure is controlled by adjusting the supporting shaft force of the inner support, and meanwhile, the stress of the stress adjusting valve is controlled to enable the second-layer supporting plate to support the soil on the outer side of the second-layer supporting plate so as to control the displacement of the soil on the outer side of the second-layer supporting plate.
2. The method for constructing a foundation pit enclosure serving as a permanent underground structure as claimed in claim 1, wherein the process of constructing the inner-layer enclosure and arranging the second-layer supporting plate comprises the following steps: manufacturing a steel reinforcement cage of the inner-layer enclosure structure, and installing a first-layer supporting plate on the outer side of the steel reinforcement cage; the stress adjusting valve and the second layer of supporting and protecting plate are sequentially arranged on the outer side of the first layer of supporting and protecting plate; and excavating a groove at the edge of a preset position of the foundation pit, placing the reinforcement cage in the groove, and pouring concrete to form an inner-layer enclosure structure.
3. The method as claimed in claim 1, wherein the inner support comprises a support rod and a support axial force adjusting valve; during the process of mounting the inner support, mounting the support shaft force adjusting valve at the first end of the support rod; and abutting the support shaft force adjusting valve against the inner surface of the inner-layer enclosure structure, and abutting the second end of the support rod against the inner surface of the inner-layer enclosure structure.
4. The method as claimed in claim 3, wherein the supporting shaft force adjusting valve is connected to a supporting shaft force reading meter, and during excavation of the foundation pit, the supporting shaft force of the inner support is measured by the supporting shaft force reading meter, and the supporting shaft force adjusting valve is adjusted according to the supporting shaft force to control the deformation of the inner support structure.
5. The method as claimed in claim 1, wherein the stress adjusting valve is connected to a stress reading gauge; and in the process of excavating the foundation pit, detecting the displacement of soil around the foundation pit, measuring the stress of the stress regulating valve through the stress reading meter, and controlling the stress regulating valve to push the second layer of supporting plate according to the detected stress and the displacement so as to control the displacement of the soil outside the second layer of supporting plate.
6. The method as claimed in claim 1, wherein the inner enclosure is used as a permanent underground structure after excavation of the foundation pit.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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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| CN110258580B true CN110258580B (en) | 2021-01-26 |
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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 |
| CN114673162B (en) * | 2022-04-15 | 2023-09-22 | 中铁上海设计院集团有限公司 | Underground vehicle foundation pit construction method |
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| KR101472753B1 (en) * | 2013-02-08 | 2014-12-18 | 조아현 | The Reinforced Stiffness Self-supporting Temporary Structure And Method Of The Same |
| CN106120804B (en) * | 2016-06-26 | 2018-12-11 | 中建三局集团有限公司 | A kind of super-giant foundation pit double-row pile second level support system and its construction method |
| CN107524152A (en) * | 2017-10-13 | 2017-12-29 | 中建八局第三建设有限公司 | A kind of foundation pit enclosure structure stress bringing device and its construction method |
| CN208235534U (en) * | 2018-01-25 | 2018-12-14 | 天津大学 | A kind of device using active isolation pile control influence of foundation excavation |
| CN208486271U (en) * | 2018-05-02 | 2019-02-12 | 张家港江苏科技大学产业技术研究院 | Foundation pit supporting construction |
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