CN104452773A - Construction method for foundation pit support with strengthening structure - Google Patents
Construction method for foundation pit support with strengthening structure Download PDFInfo
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- CN104452773A CN104452773A CN201410659468.1A CN201410659468A CN104452773A CN 104452773 A CN104452773 A CN 104452773A CN 201410659468 A CN201410659468 A CN 201410659468A CN 104452773 A CN104452773 A CN 104452773A
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- foundation pit
- layer
- excavation
- bed course
- vertical supporting
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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
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
Abstract
The invention discloses a construction method for a foundation pit support with a strengthening structure. The construction method includes the following steps: constructing a vertical supporting structure along the lateral wall of a foundation pit; constructing a first support on the vertical supporting structure; according to the designed depth of the foundation pit, dividing the foundation pit into n layers from top to bottom, wherein the height of each layer is h; conducting earth excavation, wherein a layered excavation mode is adopted in the first layer to the (n-2)th layer, a middle support is installed below each earthwork after excavation of the earthwork is completed, and the two ends of each middle support are connected with the vertical supporting structure; a subsection excavation mode is adopted in the (n-1)th layer to the nth layer, excavation to the bottom of the foundation pit is carried out at a time, and a strengthening cushion layer is poured. By means of the construction method, subsection excavation is carried out on the two layers of earthwork closest to the bottom of the foundation pit, excavation to the bottom of the foundation pit is carried out at a time, and the strengthening cushion layer is poured instantly, so that the exposure duration of the foundation pit is shortened, security risks of the foundation pit are reduced, the procedures of mounting and demounting bottom supports are omitted, influences of the process for demounting the bottom supports on adjacent synchronously-constructed foundation pit engineering are avoided, and the safety performance of the foundation pit support is improved.
Description
Technical field
The present invention relates to pattern foundation pit supporting structure, be specifically related to a kind of base pit stand construction with reinforcement structure.
Background technology
Pattern foundation pit supporting structure is the safety for ensureing Underground Construction and foundation ditch surrounding enviroment, and what adopt foundation pit side-wall and surrounding enviroment props up gear, reinforcing and safeguard measure.Along with developing rapidly of modern architecture industry, the construction space of building is more and more narrower and small, surrounding enviroment become increasingly complex, and therefore requires also more and more higher to the difficulty of foundation pit supporting project.
In traditional foundation pit supporting project, the support system that usual employing support combines with support replacement, namely in work progress, use the method for support replacement part to be supported the particularly bottom support (apart from support nearest bottom projected depth position and foundation ditch, hereafter Cheng Di road supports) dismounting.But the construction space of working as base pit engineering is subject to the restriction of surrounding enviroment, as narrower and small in foundation ditch, upper operating limited space, or when the base pit engineering of next-door neighbour's synchronous construction being impacted and restricts its programming in the process of removing the support of road, the end, the support system adopting traditional support to combine with support replacement not only increases construction sequence and complexity, and security performance also has much room for improvement.
Summary of the invention
The present invention, in order to overcome above deficiency, provides one and both can reduce construction complexity, accelerating construction progress, and that can improve again pattern foundation pit supporting structure security performance has the base pit stand construction strengthening structure.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of have the base pit stand construction strengthening structure, comprises the following steps:
S1: to construct vertical supporting and protection structure along foundation pit side-wall;
S2: first road of constructing in vertical supporting and protection structure supports;
S3: according to the design of foundation pit degree of depth, namely foundation ditch needs the degree of depth of excavation, and foundation ditch is from top to bottom divided into n layer, and setting every layer height is h, and wherein, n is positive integer;
S4: when n is greater than 2, soil excavation, for the 1st layer to the n-th-2 layers, adopt stage excavation mode, install intermediate supports in below after every layer of soil excavation, the two ends of intermediate supports are connected with vertical supporting and protection structure; When n is less than or equal to 2, directly enter step 5;
S5: for (n-1)th layer to n-th layer, adopts excavation section by section mode, disposablely digs to foundation ditch, and builds reinforcement bed course.
Further, in described step S1, vertical supporting and protection structure is reinforced concrete structure.
Further, in described step S2, first road is supported for reinforced concrete structure.
Further, in described step S2, described first road supports and passes through bar connecting with described vertical supporting and protection structure.
Further, concrete curing is carried out to described reinforced concrete structure, make it reach designing requirement intensity.
Further, described step S5 comprises:
S51: according to surrounding environment and the safe condition of foundation ditch, is longitudinally divided into some segmentations that width is w by the earthwork;
S52: bottom the first excavation section by section to foundation ditch, builds reinforcement bed course, has built in 6h.
S53: after treating that the reinforcement bed course of a segmentation reaches predetermined strength, excavate next segmentation successively, dig to foundation ditch, and build reinforcement bed course, until reinforcement bed course is all built in all segmentations;
Further, described reinforcement bed course is reinforced concrete structure.
Provided by the invention have the base pit stand construction strengthening structure, excavation section by section is carried out in the nearest two-layer earthwork bottom foundation ditch of adjusting the distance, disposablely be excavated to bottom foundation ditch, and build the method strengthening bed course immediately, not only reduce open-assembly time and the security risk of foundation ditch, and reduce the installation of road, end support and the program of dismounting, avoid impacting the base pit engineering of next-door neighbour's synchronous construction in the process of removing the support of road, the end, reduce construction sequence and complexity, in addition, reinforcement bed course enhances the support effect bottom to foundation ditch, improve foundation pit supporting construction intensity and security performance.
Accompanying drawing explanation
Fig. 1 is the flow chart that the present invention has the base pit stand construction strengthening structure;
Fig. 2 is the elevational schematic of foundation pit supporting construction of the present invention;
Fig. 3 is the cross-sectional schematic diagram of segmentation foundation pit supporting construction of the present invention.
Shown in Fig. 2-3: 1, vertical supporting and protection structure; 2, first road supports; 3, intermediate supports; 4, bed course is strengthened; 5, the earthwork; The number of plies of n, the earthwork; H, every layer of earthwork height; The width of w, segmentation.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail:
As Figure 1-3, the invention provides a kind of base pit stand construction with reinforcement structure, comprise the following steps:
S1: to construct vertical supporting and protection structure 1 along foundation pit side-wall; Preferably, described vertical supporting and protection structure 1 is reinforced concrete structure, and concrete curing is carried out after vertical supporting and protection structure 1 of having constructed, it is made to reach designing requirement intensity, wherein designing requirement intensity is determined according to the maximum weighted of vertical supporting and protection structure 1 in foundation pit construction process, is not less than C20 under normal circumstances.
S2: first road of constructing in vertical supporting and protection structure 1 supports 2; Wherein, it is reinforced concrete structure that first road supports 2, carries out concrete curing, make it reach designing requirement intensity after construction Wan Shou road supports 2, wherein designing requirement intensity is determined according to the maximum weighted of first road support 2 in foundation pit construction process, is not less than C20 under normal circumstances.Further, first road support 2 passes through bar connecting with vertical supporting and protection structure 1.
S3: according to design of foundation pit depth H, namely foundation ditch needs the degree of depth of excavation to be H, and foundation ditch is from top to bottom divided into n layer, and setting every layer height is h, and wherein n is positive integer, i.e. the height of every layer of earthwork 5 is h, and preferably, h is 3 ~ 4m; Certainly, according to actual needs, the earthwork 5 of last one deck (i.e. n-th layer) highly also can be less than h.
S4: as n>2, soil excavation, for the 1st layer to the n-th-2 layers, adopt stage excavation mode, install intermediate supports 3 in below after every layer of soil excavation, the two ends of intermediate supports 3 are connected with vertical supporting and protection structure 1, when n is less than or equal to 2, without the need to installing intermediate supports 3;
S5: for (n-1)th layer to n-th layer, adopt excavation section by section mode, the earthwork 5 of every section is disposable digs to foundation ditch, and builds reinforcement bed course 4.Namely do not adopt stage excavation mode, supporting without the need to installing road, the end (n-1)th layer of below, comprising the following steps:
S51: according to surrounding environment and the safe condition of foundation ditch, the earthwork 5 is longitudinally divided into some segmentations that width is w, it should be noted that, foundation ditch has long and wide two parameters in the horizontal plane, wherein larger parameter is defined as longitudinal direction by the present embodiment, and less parameter is defined as transverse direction, and the scope of w is 5 ~ 15m, as the surrounding environment of foundation ditch and safe condition poor time, w is set to 5m; The surrounding environment of foundation ditch and safe condition better time be 15m by w;
S52: bottom the first excavation section by section to foundation ditch, and build reinforcement bed course 4 immediately, preferably, carry out building best results within 6 little times, to reduce the open-assembly time of foundation ditch, reduce the security risk of foundation ditch;
S53: after treating that the reinforcement bed course 4 of a segmentation reaches predetermined strength, excavate next segmentation successively, dig to foundation ditch, and build reinforcement bed course 4, until all segmentations are all built strengthen bed course 4, under normal circumstances, predetermined strength is not less than C20, and specifically sets according to actual conditions;
Preferably, described reinforcement bed course 4 is reinforced concrete structure, simultaneously can by strengthening concrete class, add heavy thickness, set up the methods such as body of putting more energy into (as shaped steel) and improve and strengthen bed course semi-finals degree.
In sum, the present invention is adopted to have the base pit stand construction strengthening structure, excavation section by section is carried out in the nearest two-layer earthwork bottom foundation ditch of adjusting the distance, disposablely be excavated to bottom foundation ditch, and build the method strengthening bed course 4 in time, not only reduce open-assembly time and the security risk of foundation ditch, and reduce installation and the program of dismounting that road, the end supports 2, avoid impacting the base pit engineering of next-door neighbour's synchronous construction in the process of removing road, end support 2, reduce construction sequence and complexity, in addition, reinforcement bed course 4 enhances the support effect bottom to foundation ditch, improve intensity and the security performance of foundation pit supporting construction.
Although be illustrated embodiments of the present invention in manual, these embodiments just as prompting, should not limit protection scope of the present invention.Carry out various omission, displacement and change without departing from the spirit and scope of the present invention all should be included in protection scope of the present invention.
Claims (8)
1. there is the base pit stand construction strengthening structure, it is characterized in that, comprise the following steps:
S1: to construct vertical supporting and protection structure along foundation pit side-wall;
S2: first road of constructing in vertical supporting and protection structure supports;
S3: according to the design of foundation pit degree of depth, is from top to bottom divided into n layer by foundation ditch, and setting every layer height is h, and wherein, n is positive integer;
S4: when n is greater than 2, soil excavation, for the 1st layer to the n-th-2 layers, adopt stage excavation mode, install intermediate supports in below after every layer of soil excavation, the two ends of intermediate supports are connected with vertical supporting and protection structure; When n is less than or equal to 2, directly enter step 5;
S5: for (n-1)th layer to n-th layer, adopts excavation section by section mode, disposablely digs to foundation ditch, and builds reinforcement bed course.
2. have the base pit stand construction strengthening structure according to claim 1, it is characterized in that, in described step S1, vertical supporting and protection structure is reinforced concrete structure.
3. have the base pit stand construction strengthening structure according to claim 1, it is characterized in that, in described step S2, first road is supported for reinforced concrete structure.
4. there is the base pit stand construction strengthening structure according to Claims 2 or 3, it is characterized in that, also comprise: concrete curing is carried out to described reinforced concrete structure, make it reach designing requirement intensity.
5. have the base pit stand construction strengthening structure according to claim 1, it is characterized in that, in described step S2, described first road supports and passes through bar connecting with described vertical supporting and protection structure.
6. have the base pit stand construction strengthening structure according to claim 1, it is characterized in that, described step S5 comprises:
S51: according to surrounding environment and the safe condition of foundation ditch, is longitudinally divided into some segmentations that width is w by the earthwork;
S52: bottom the first excavation section by section to foundation ditch, builds reinforcement bed course;
S53: after treating that the reinforcement bed course of a segmentation reaches predetermined strength, excavate next segmentation successively, dig to foundation ditch, and build reinforcement bed course, until reinforcement bed course is all built in all segmentations;
7. there is base pit stand construction according to claim 6 that strengthen structure, it is characterized in that, after bottom excavation section by section to foundation ditch, complete in 6 hours and build reinforcement bed course.
8. have the base pit stand construction strengthening structure according to claim 1, it is characterized in that, described reinforcement bed course is reinforced concrete structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410659468.1A CN104452773A (en) | 2014-11-18 | 2014-11-18 | Construction method for foundation pit support with strengthening structure |
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| CN201410659468.1A CN104452773A (en) | 2014-11-18 | 2014-11-18 | Construction method for foundation pit support with strengthening structure |
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| CN104452773A true CN104452773A (en) | 2015-03-25 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105421464A (en) * | 2015-12-07 | 2016-03-23 | 中国建筑第八工程局有限公司 | Earth excavation method for small foundation pit |
| CN105756091A (en) * | 2016-03-16 | 2016-07-13 | 山东理工大学 | Metro station foundation pit construction method for controlling deformation of neighboring buildings |
| CN111042145A (en) * | 2020-01-02 | 2020-04-21 | 中国水利水电第八工程局有限公司 | Construction method for excavating foundation pit near deep-buried large-diameter pipeline |
| CN111411629A (en) * | 2020-03-16 | 2020-07-14 | 徐州市城市轨道交通有限责任公司 | Construction method for common pile excavation of long and narrow type wind pavilion structure and main body structure |
| CN113653067A (en) * | 2021-08-31 | 2021-11-16 | 天津大学 | Foundation pit excavation advance support construction method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105421464A (en) * | 2015-12-07 | 2016-03-23 | 中国建筑第八工程局有限公司 | Earth excavation method for small foundation pit |
| CN105421464B (en) * | 2015-12-07 | 2017-11-10 | 中国建筑第八工程局有限公司 | Small-scale pit earthwork digging method |
| CN105756091A (en) * | 2016-03-16 | 2016-07-13 | 山东理工大学 | Metro station foundation pit construction method for controlling deformation of neighboring buildings |
| CN111042145A (en) * | 2020-01-02 | 2020-04-21 | 中国水利水电第八工程局有限公司 | Construction method for excavating foundation pit near deep-buried large-diameter pipeline |
| CN111042145B (en) * | 2020-01-02 | 2022-03-11 | 中国水利水电第八工程局有限公司 | Construction method for excavating foundation pit near deep-buried large-diameter pipeline |
| CN111411629A (en) * | 2020-03-16 | 2020-07-14 | 徐州市城市轨道交通有限责任公司 | Construction method for common pile excavation of long and narrow type wind pavilion structure and main body structure |
| CN113653067A (en) * | 2021-08-31 | 2021-11-16 | 天津大学 | Foundation pit excavation advance support construction method |
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Application publication date: 20150325 |