CN105484268A - Construction method of bottom plate of foundation pit - Google Patents
Construction method of bottom plate of foundation pit Download PDFInfo
- Publication number
- CN105484268A CN105484268A CN201510823322.0A CN201510823322A CN105484268A CN 105484268 A CN105484268 A CN 105484268A CN 201510823322 A CN201510823322 A CN 201510823322A CN 105484268 A CN105484268 A CN 105484268A
- Authority
- CN
- China
- Prior art keywords
- piecemeal
- reinforcing bar
- foundation pit
- bar cage
- base plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Abstract
The invention provides a construction method of a bottom plate of a foundation pit. A region to be excavated of the foundation pit is divided into a plurality of small blocks, the bottom plate is constructed after the blocks are excavated one by one, so that unloading amount of excavated soil bodies every time is reduced greatly, the probability of raising of the bottom of the foundation pit after unloading of the excavated soil bodies is greatly reduced, and safety of construction is improved. In addition, before construction of the blocks of the bottom plate, reinforcement cages, corresponding to the blocks, of the bottom plate have been prefabricated, site construction time of construction of the bottom plate is greatly shortened, on one hand, the probability of raising of the bottom of the foundation pit is reduced further, on the other hand, the construction efficiency of the bottom plate of the foundation pit is improved effectively, and the purposes of safety and high efficiency are achieved.
Description
Technical field
The present invention relates to technical field of building construction, be specifically related to a kind of construction method of base plate of foundation pit.
Background technology
In order to the safety and surrounding environment that ensure foundation pit construction, main body underground structure are without prejudice, pattern foundation pit supporting structure, precipitation, soil excavation and base plate of foundation pit construction etc. are all needed to carry out comprehensive design and monitoring.In recent years, along with the excavation of foundation ditch is more and more darker, area is increasing, the control of Construction of Super Large Deep Foundation Pit to environment deformation process becomes more and more tired next, disposable excavation is larger on surrounding enviroment impact, soil excavation unloading huge in construction, the resilience of foundation ditch bottom soil body also will be inevitable to the adverse effect of surrounding formations.
In addition, along with the develop rapidly of track traffic, Urban underground Tunnel has defined huge networking, and subterranean tunnel network is quite intensive in some metropolitan some areas, carries out foundation pit construction inevitable at underground tunnel upper.When after the huge soil excavation unloading in foundation ditch, subway tunnel can be caused to float, directly affect the safe operation of subway tunnel.
The construction technology of traditional base plate of foundation pit: first, is excavated to design elevation by bottom foundation ditch; Then, base plate steel bar binding and template support is carried out; Finally, carry out underplate concrete to water and smash.In the work progress of above-mentioned base plate of foundation pit, reinforcing bar binding needs the time of at substantial, and foundation ditch bottom-exposed to come out to the time that construction of bottom plates completes longer, cause the probability of resilience protuberance bottom foundation ditch will be higher.In addition, if foundation ditch position is just in time positioned near subway tunnel, in order to avoid the impact on metro operation, allow the time period of foundation pit construction to be usually all limited between 23:00-6:00, the construction technology of traditional base plate of foundation pit cannot meet the requirement of construction safety and engineering time.
For this reason, the construction technology developing a kind of base plate of foundation pit is safely and efficiently necessary.
Summary of the invention
The object of the present invention is to provide a kind of construction method of base plate of foundation pit, affect the problem of surrounding formations safety to solve foundation ditch dig on a wide area in prior art.
For solving the problems of the technologies described above, the invention provides a kind of construction method of base plate of foundation pit, comprising:
Step one: foundation ditch is treated excavation region be divided into several piecemeal F1 adjoined each other, F2 ..., Fn, wherein, n be greater than 2 integer;
Step 2: according to each described point block size, prefabricated corresponding baseplate reinforcing bar cage;
Step 3: piecemeal F1 described in is excavated, and is excavated to design elevation;
Step 4: the described baseplate reinforcing bar cage corresponding with described piecemeal F1 is sling, and be placed in the described piecemeal F1 in described step 3;
Step 5: casting and compacting of concrete is carried out to the described piecemeal F1 in described step 4, forms the partitioned underplate of described piecemeal F1, and expose the clinch of the described baseplate reinforcing bar cage of described piecemeal F1;
Step 6: piecemeal F2 described in another adjacent with described piecemeal F1 is excavated, and is excavated to design elevation;
Step 7: the described baseplate reinforcing bar cage corresponding with piecemeal F2 described in another is sling, and in being placed in described step 6 piecemeal F2 described in another, the clinch of the described baseplate reinforcing bar cage of piecemeal F2 described in another and the baseplate reinforcing bar cage lap of described piecemeal F1 is tied up;
Step 8: casting and compacting of concrete is carried out to piecemeal F2 described in another in described step 7, casting and compacting of concrete is carried out to the clinch of the lap of piecemeal F2 described in another and described piecemeal F1 simultaneously, formed be connected with the partitioned underplate of described piecemeal F1 another described in the partitioned underplate of piecemeal F2, and expose the clinch of the described baseplate reinforcing bar cage of piecemeal F2 described in another; And
Step 9: repeat step 6 to step 8, until form the base plate of foundation pit be connected.
Optionally, described baseplate reinforcing bar cage comprises hypodermis reinforcing bar, longitudinal shear support, epithelium reinforcing bar and strengthens truss, described longitudinal shear support is arranged between described hypodermis reinforcing bar and described epithelium reinforcing bar, described hypodermis reinforcing bar and described epithelium reinforcing bar are provided with reinforcement truss, described reinforcement truss comprises transverse truss arranged in a crossed manner and longitudiual truss, and the predetermined crosspoint of described transverse truss and longitudiual truss arranges suspension centre reinforcing rib.
Optionally, also comprise between described step 3 and described step 4: lay rubble, EPS plate and template from the bottom up successively in the bottom of described F1 piecemeal.
Optionally, also comprise between described step 6 and described step 7: described in another, the bottom of F2 piecemeal lays rubble, EPS plate and template from the bottom up successively.
Optionally, the clinch length of described baseplate reinforcing bar cage is 1m ~ 1.2m.
Optionally, described piecemeal area is 45m
2~ 70m
2.
In terms of existing technologies, the construction method of base plate of foundation pit provided by the present invention at least has following useful technique effect:
1. improve working security: by treating that excavation region is divided into some little piecemeals, then a piecemeal is excavated, then construction of bottom plates is carried out to the piecemeal after excavation, after the construction of bottom plates of a piecemeal terminates, just start point BOB(beginning of block) excavation construction adjacent to it, made until all piecemeals excavate one by one and complete base plate.That is, excavated the foundation ditch come out and only have a piecemeal, the discharging quantity of its soil body is greatly reduced, thus the probability of bottom ground heave is greatly diminished; In addition, can be covered by base plate rapidly bottom the piecemeal after excavation, the shortening of excavation piecemeal bottom-exposed time can reduce the probability of bottom ground heave further, makes foundation pit construction process safer.
2. improve efficiency of construction: before every root partitioned underplate construction, baseplate reinforcing bar cage required for this base plate is prefabricated to be completed, when therefore carrying out construction of bottom plates after piecemeal excavation, only need the bottom prefabricated baseplate reinforcing bar cage being hung in foundation ditch piecemeal, can construction of bottom plates be carried out.Avoid excavation of foundation pit on-the-spot colligation operation of carrying out reinforcing cage bottom foundation ditch, greatly saved the on-the-spot engineering time, improve efficiency of construction.Especially the foundation pit construction carried out near subway, the shortening of on-site construction time has very important significance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the baseplate reinforcing bar cage of one embodiment of the invention;
Fig. 2 is the profile of Fig. 1 along A-A;
Fig. 3 is the structural representation that piecemeal F1 is excavated to design elevation;
Fig. 4 is the structural representation after the baseplate reinforcing bar cage lifting of piecemeal F1;
Fig. 5 is the structural representation after the base plate cast of piecemeal F1;
Fig. 6 is the structural representation that piecemeal F2 is excavated to design elevation;
Fig. 7 is the structural representation after the baseplate reinforcing bar cage lifting of piecemeal F2;
Fig. 8 is the structural representation after the base plate cast of piecemeal F2;
Fig. 9 is the floor map after piecemeal F1 and piecemeal F2 base plate are poured into a mould.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the construction method that the present invention proposes a kind of base plate of foundation pit is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
The construction method of the base plate of foundation pit of one embodiment of the invention is described in detail below in conjunction with Fig. 1 to Fig. 6:
Step one: foundation ditch is treated excavation region be divided into several piecemeal F1 adjoined each other, F2 ..., Fn, wherein, n be greater than 2 integer;
Can according to the practice of construction environment treating excavation pit, determine the size and shape of each piecemeal, the size of each piecemeal area is advisable can not cause the rear bottom ground heave of excavation, in principle, piecemeal area is less, after excavation, the probability of its bottom heave is lower, and preferably, the area of each piecemeal is 45m
2~ 70m
2.
Step 2: according to each described point block size, prefabricated corresponding baseplate reinforcing bar cage;
In order to save the engineering time, after completing piecemeal division, can according to the size of each piecemeal, prefabricated corresponding baseplate reinforcing bar cage, by the time after certain piecemeal excavation, can directly directly hang in the baseplate reinforcing bar cage of this piecemeal corresponding, bottom the foundation ditch exposed, the construction sequence of baseplate reinforcing bar cage colligation is carried out after eliminating piecemeal excavation, shorten on-site construction time, decrease the time of the rear foundation ditch bottom-exposed of piecemeal excavation soil body unloading simultaneously, reduce the probability of bottom ground heave.
Specifically, composition graphs 1 and Fig. 2, baseplate reinforcing bar cage 100 comprises hypodermis reinforcing bar 1, longitudinal shear support 2, epithelium reinforcing bar 3 and strengthens truss 4.Longitudinal shear support 2 is arranged between hypodermis reinforcing bar 1 and epithelium reinforcing bar 3, hypodermis reinforcing bar 1 and epithelium reinforcing bar 3 are provided with and strengthen truss 4, strengthen truss 4 and comprise transverse truss 5 arranged in a crossed manner and longitudiual truss 6, the predetermined crosspoint of transverse truss 5 and longitudiual truss 6 arranges suspension centre reinforcing rib 7.For traditional baseplate reinforcing bar cage, baseplate reinforcing bar cage 100 of the present invention adds strengthens truss 4 and suspension centre reinforcing rib 7, mainly for the installation of slinging of convenient steadily safety, avoid in the process of lifting, baseplate reinforcing bar cage 100 deforms or rotates in lifting process.
Step 3: as shown in Figure 3, excavates piecemeal F1 described in, and is excavated to design elevation;
Excavation after design elevation, building of the underplate concrete conveniently in subsequent step, the bottom of the F1 piecemeal after can excavating lay successively from the bottom up rubble, EPS plate (
expandedpolystyreneboard, be called for short EPS plate) and template, EPS plate reduces vibration influence to around building in follow-up casting and compacting of concrete process as cushion coat, especially bottom foundation ditch be subway tunnel or other underground space structures time, the laying of EPS plate effectively can reduce the vibration influence of base plate of foundation pit construction to around building.
Step 4: the described baseplate reinforcing bar cage corresponding with described piecemeal F1 is sling, and be placed in the described piecemeal F1 in described step 3;
As shown in Figure 4, the baseplate reinforcing bar cage 100 corresponding with piecemeal F1 is hung onto in the piecemeal F1 after excavation, conveniently the base plate of each piecemeal and the base plate of adjacent piecemeal integral, need the baseplate reinforcing bar cage 100 of each piecemeal also to overlap.For this reason, each baseplate reinforcing bar cage 100 can arrange clinch 8, for overlapping with adjacent baseplate reinforcing bar cage 100.Conveniently lapping construction, preferably, the length of clinch 8 is 1m ~ 1.2m.
Step 5: as shown in Figure 5, carries out casting and compacting of concrete to the piecemeal F1 in step 4, forms the partitioned underplate of piecemeal F1, conveniently overlaps with the baseplate reinforcing bar cage of adjacent piecemeal, need the clinch 8 of the baseplate reinforcing bar cage 100 of piecemeal F1 to come out;
Step 6: as shown in Figure 6, excavates another piecemeal F2 adjacent with piecemeal F1, and is excavated to design elevation;
With step 3 roughly the same, preferably, also can lay rubble, EPS plate and template from the bottom up successively in the bottom at another F2 piecemeal.
Step 7: as shown in Figure 7, another baseplate reinforcing bar cage 200 corresponding with another piecemeal F2 is sling, and be placed in another piecemeal F2 in step 6, the lap of the clinch 9 of another baseplate reinforcing bar cage 200 and baseplate reinforcing bar cage 100 clinch 8 is tied up, another baseplate reinforcing bar cage 200 and baseplate reinforcing bar cage 100 are connected;
Step 8: composition graphs 8 and Fig. 9, casting and compacting of concrete is carried out to another piecemeal F2 in step 7, casting and compacting of concrete is carried out to the clinch 9 of reinforcing cage 200 and the lap of baseplate reinforcing bar cage 100 clinch 8 simultaneously, form the partitioned underplate of another piecemeal F2 be connected with the partitioned underplate of piecemeal F1, and expose all the other clinch (not shown)s of the baseplate reinforcing bar cage 200 of another piecemeal F2;
Step 9: repeat step 6 to step 8, until form the base plate of foundation pit be connected.
In sum, adopt the construction method of base plate of foundation pit of the present invention, by foundation ditch being treated excavation region is divided into multiple little piecemeal, then each piecemeal carried out after excavation one by one and carry out construction of bottom plates, the soil body discharging quantity of each excavation is significantly reduced, thus make, because the protuberance probability after the unloading of the excavation soil body bottom foundation ditch significantly reduces, to improve the safety of construction.In addition, before each partitioned underplate construction, complete prefabricated for baseplate reinforcing bar cage corresponding thereto, greatly reduce the on-site construction time of construction of bottom plates, reduce further the probability of bottom ground heave on the one hand, effectively improve the efficiency of construction of base plate of foundation pit on the other hand, achieve object safely and efficiently.
Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention, and any change that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, modification, all belong to the protection domain of claims.
Claims (6)
1. a construction method for base plate of foundation pit, is characterized in that, comprising:
Step one: foundation ditch is treated excavation region be divided into several piecemeal F1 adjoined each other, F2 ..., Fn, wherein, n be greater than 2 integer;
Step 2: according to each described point block size, prefabricated corresponding baseplate reinforcing bar cage;
Step 3: piecemeal F1 described in is excavated, and is excavated to design elevation;
Step 4: the described baseplate reinforcing bar cage corresponding with described piecemeal F1 is sling, and be placed in the described piecemeal F1 in described step 3;
Step 5: casting and compacting of concrete is carried out to the described piecemeal F1 in described step 4, forms the partitioned underplate of described piecemeal F1, and expose the clinch of the described baseplate reinforcing bar cage of described piecemeal F1;
Step 6: piecemeal F2 described in another adjacent with described piecemeal F1 is excavated, and is excavated to design elevation;
Step 7: the described baseplate reinforcing bar cage corresponding with piecemeal F2 described in another is sling, and in being placed in described step 6 piecemeal F2 described in another, the lap of the clinch of the described baseplate reinforcing bar cage of piecemeal F2 described in another and the described baseplate reinforcing bar cage of described piecemeal F1 is tied up;
Step 8: casting and compacting of concrete is carried out to piecemeal F2 described in another in described step 7, casting and compacting of concrete is carried out to the lap of the described baseplate reinforcing bar cage of piecemeal F2 described in another and the described baseplate reinforcing bar cage of described piecemeal F1 simultaneously, formed be connected with the partitioned underplate of described piecemeal F1 another described in the partitioned underplate of piecemeal F2, and expose all the other clinchs of the described baseplate reinforcing bar cage of piecemeal F2 described in another; And
Step 9: repeat step 6 to step 8, until form the base plate of foundation pit be connected.
2. the construction method of base plate of foundation pit as claimed in claim 1, it is characterized in that, described baseplate reinforcing bar cage comprises hypodermis reinforcing bar, longitudinal shear support, epithelium reinforcing bar and strengthens truss, described longitudinal shear support is arranged between described hypodermis reinforcing bar and described epithelium reinforcing bar, described hypodermis reinforcing bar and described epithelium reinforcing bar are provided with reinforcement truss, described reinforcement truss comprises transverse truss arranged in a crossed manner and longitudiual truss, and the predetermined crosspoint of described transverse truss and longitudiual truss arranges suspension centre reinforcing rib.
3. the construction method of base plate of foundation pit as claimed in claim 2, is characterized in that, also comprise between described step 3 and described step 4: lay rubble, EPS plate and template from the bottom up successively in the bottom of described F1 piecemeal.
4. the construction method of base plate of foundation pit as claimed in claim 3, is characterized in that, also comprise between described step 6 and described step 7: the bottom of F2 piecemeal lays rubble, EPS plate and template from the bottom up successively described in another.
5. the construction method of base plate of foundation pit as claimed in claim 3, it is characterized in that, the clinch length of described baseplate reinforcing bar cage is 1m ~ 1.2m.
6. the construction method of the base plate of foundation pit according to any one of claim 1 to 5, is characterized in that, described piecemeal area is 45m
2~ 70m
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510823322.0A CN105484268A (en) | 2015-11-24 | 2015-11-24 | Construction method of bottom plate of foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510823322.0A CN105484268A (en) | 2015-11-24 | 2015-11-24 | Construction method of bottom plate of foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105484268A true CN105484268A (en) | 2016-04-13 |
Family
ID=55671514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510823322.0A Pending CN105484268A (en) | 2015-11-24 | 2015-11-24 | Construction method of bottom plate of foundation pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105484268A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113373934A (en) * | 2021-05-06 | 2021-09-10 | 上海建工集团股份有限公司 | Foundation pit bottom plate structure and construction method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0559728A (en) * | 1991-08-28 | 1993-03-09 | Maeda Corp | Sheathing work above underground structure |
| CN1837506A (en) * | 2006-04-12 | 2006-09-27 | 上海市政工程设计研究总院 | Construction method for excavating box-shape structure over an operating tunnel |
| CN101250882A (en) * | 2008-04-03 | 2008-08-27 | 上海市第一建筑有限公司 | Method for discharging construction of underground tunnel upper |
| CN201176598Y (en) * | 2007-12-28 | 2009-01-07 | 浙江环宇建设集团有限公司 | Foundation slab reinforced bar caging over subway tunnel |
| CN102704601A (en) * | 2012-06-12 | 2012-10-03 | 潘君 | Cast-in-place concrete hollow floor |
-
2015
- 2015-11-24 CN CN201510823322.0A patent/CN105484268A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0559728A (en) * | 1991-08-28 | 1993-03-09 | Maeda Corp | Sheathing work above underground structure |
| CN1837506A (en) * | 2006-04-12 | 2006-09-27 | 上海市政工程设计研究总院 | Construction method for excavating box-shape structure over an operating tunnel |
| CN201176598Y (en) * | 2007-12-28 | 2009-01-07 | 浙江环宇建设集团有限公司 | Foundation slab reinforced bar caging over subway tunnel |
| CN101250882A (en) * | 2008-04-03 | 2008-08-27 | 上海市第一建筑有限公司 | Method for discharging construction of underground tunnel upper |
| CN102704601A (en) * | 2012-06-12 | 2012-10-03 | 潘君 | Cast-in-place concrete hollow floor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113373934A (en) * | 2021-05-06 | 2021-09-10 | 上海建工集团股份有限公司 | Foundation pit bottom plate structure and construction method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101838968B (en) | Double track bridge construction process crossing existing railway operational lines | |
| CN104594361B (en) | A kind of I shape fender post and building enclosure also serve as the construction method of agent structure | |
| CN104294769B (en) | A kind of piling and the construction method increasing the built bridge abutment structure of platform cap composite reinforcement | |
| CN204457792U (en) | A kind ofly dig large diameter shield tunnel with many pilot tunnel methods and the subway station of building | |
| CN107965325B (en) | A kind of small interval shallow tunnel just branch arch replacement construction method | |
| CN109989405A (en) | Base pit stand construction under boulder site condition | |
| CN103572765A (en) | Treatment and construction method of bridge site river bank expansive soil landslide positions | |
| CN108867692A (en) | The protection of city big cross section open trench tunnel Nearby Structure and tunnel foundation pit method for digging | |
| CN113638445A (en) | Semi-inverse construction method for ultra-deep circular foundation pit | |
| CN103161176A (en) | Tower crane foundation construction method in main building connected garage | |
| CN206408630U (en) | Anchor head is placed in the Pile-Anchor Supporting for Deep Excavation system of pile body | |
| CN108301440A (en) | With waterproof, the underground pipe gallery construction method of drain function | |
| CN110158609A (en) | A kind of mechanization demolition reduction method of reinforced concrete brace in foundation pit | |
| CN204097889U (en) | A kind of piling and the built bridge abutment structure of increase platform cap composite reinforcement | |
| CN101994314A (en) | Longhole rectangular terraced antiskid pile jump-preventing excavating construction | |
| CN106917358B (en) | A kind of cable-stayed bridge main-beam combination constructing method thereof and its counter weight construction system | |
| CN210636443U (en) | Tunnel top foundation pit reinforcing structure | |
| CN108487072B (en) | Across Business Line railway cast-in-place frame bridge rapid constructing method in one kind | |
| CN105484268A (en) | Construction method of bottom plate of foundation pit | |
| CN111218938A (en) | Excavation construction method for foundation pit above existing tunnel | |
| CN107401142B (en) | Bank revetment heightening construction method is refuted in active service | |
| CN204418229U (en) | Poured band of outer wall of basement concrete draw-in groove | |
| CN106592598A (en) | Same-layer double-beam large-diameter steel pipe support and deep foundation pit combined inner support formed thereby | |
| CN207260082U (en) | Active service refutes bank revetment and increases structure | |
| CN206337566U (en) | Foundation ditch vertical prestressing anchor pole supporting construction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160413 |