CN114809087A - Early-dismantling construction method for supporting wall of deep and shallow foundation pit - Google Patents
Early-dismantling construction method for supporting wall of deep and shallow foundation pit Download PDFInfo
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- CN114809087A CN114809087A CN202210391371.1A CN202210391371A CN114809087A CN 114809087 A CN114809087 A CN 114809087A CN 202210391371 A CN202210391371 A CN 202210391371A CN 114809087 A CN114809087 A CN 114809087A
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- 238000010276 construction Methods 0.000 title claims abstract description 50
- 239000004567 concrete Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002411 adverse Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
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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
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
- E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses an early dismantling construction method for a supporting wall of a deep and shallow foundation pit, which realizes synchronous dismantling and early dismantling construction of a first support and a second support of the deep and shallow foundation pit and the supporting wall, is convenient for construction of a main structure, reduces construction cost, greatly saves construction period, utilizes space-time effect and reduces adverse effects on existing peripheral underground structures (such as subways and tunnels). The inclined strut is adopted to directly transmit the stress of the supporting structure of the shallow foundation pit to the bottom plate of the shallow foundation pit and then to the main structure, so that the force transmission path is more direct and safe. On the other hand, the inclined strut of the reinforced concrete has small volume, is convenient for site construction, is convenient to chisel and clean, and can save the construction cost. The invention solves the problems that the construction period is prolonged and the construction difficulty is improved because the main structure in the deep and shallow foundation pit can not be constructed synchronously.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method for early dismantling of a supporting wall of a deep and shallow foundation pit.
Background
And in the asynchronous construction of the deep and shallow foundation pits, pit-by-pit excavation and pit-by-pit construction are required. The deep foundation pit and the shallow foundation pit are separated by a middle partition (continuous) wall and a fender post. The deep and shallow foundation pits are supported by a plurality of supports respectively to ensure the safety of the foundation pits. The support in the pit needs to be removed in advance along with the construction of the main structure. And after the main structure in the deep foundation pit and the shallow foundation pit is constructed in a segmented manner, dismantling the supporting wall, and further constructing the main structure in the supporting wall area.
The main structure in the deep and shallow foundation pit cannot be synchronously constructed, so that the construction period is prolonged, the adverse effect on the peripheral existing structure is increased, and the construction cost is also increased. After the sectional construction of the main structure in the deep foundation pit and the shallow foundation pit is completed, the difficulty in removing the supporting wall is high, the danger coefficient is high, the cost is high, and the construction period is long.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
In order to overcome the defects in the prior art, the method for early dismantling the supporting wall of the deep and shallow foundation pit is provided so as to solve the problems that the construction period is prolonged and the construction difficulty is improved because the main structure in the deep and shallow foundation pit cannot be synchronously constructed.
In order to achieve the aim, the early-dismantling construction method for the supporting wall of the deep and shallow foundation pit comprises the following steps:
dividing a first main structure in a deep foundation pit into a lower-layer structure and an upper-layer structure, wherein the top elevation of the lower-layer structure is higher than the bottom plate elevation of the shallow foundation pit, and constructing the lower-layer structure and the bottom plate firstly so that the lower-layer structure is supported on one side, far away from the shallow foundation pit, of the supporting wall;
after the lower-layer structure is supported on the supporting wall, constructing an inclined strut in the shallow foundation pit, so that the inclined strut is supported on the bottom plate and the side wall of the side, far away from the supporting wall, of the shallow foundation pit;
removing horizontal inner supports in the deep foundation pit and the shallow foundation pit;
removing the supporting wall above the position of the bottom plate;
and simultaneously constructing the upper layer structure in the deep foundation pit and constructing a second main body structure in the shallow foundation pit, so that the second main body structure and the upper layer structure are connected into a whole.
Further, before the bottom plate is constructed, a cushion layer is poured at the bottom of the shallow foundation pit, and a water stop strip is arranged between the cushion layer and the supporting wall.
Further, the step of constructing the base plate includes:
paving a waterproof layer on the cushion layer, and reserving an upturned section on the waterproof layer along the wall surface direction of the support wall;
and pouring the bottom plate on the waterproof layer, forming a notch at one end of the bottom plate close to the supporting wall, and implanting the main rib of the bottom plate into the operation supporting wall.
Further, after the supporting wall above the bottom plate is removed, the upturned section is laid on the upper end face of the rest supporting wall;
and pouring concrete in the upturned section paved on the upper end surface and the notch to complete the bottom plate, and implanting main ribs of the bottom plate into the side wall of the lower layer structure.
Further, the step of constructing the inclined strut in the shallow foundation pit comprises:
constructing an outer wall of the second main body structure on one side of the bottom plate far away from the supporting wall, wherein the outer wall is abutted against the side wall of the shallow foundation pit;
and pouring the inclined strut on the bottom plate, so that the inclined strut is supported between the bottom plate and the outer wall.
Further, concrete gusset plates are poured between the root parts of the outer walls and the bottom plate, and the concrete gusset plates are arranged right below the inclined struts.
The construction method for early dismantling the supporting wall of the deep and shallow foundation pit has the advantages that the one-way and two-way supports of the deep and shallow foundation pit and the supporting wall can be dismantled synchronously, early dismantling construction is realized, main structure construction is facilitated, construction cost is reduced, construction period is greatly shortened, and adverse effects on existing surrounding underground structures (such as subways and tunnels) are reduced by utilizing a space-time effect. The inclined strut is adopted to directly transmit the stress of the supporting structure of the shallow foundation pit to the bottom plate of the shallow foundation pit and then to the main structure, and the force transmission path is more direct and safe. On the other hand, the inclined strut of the reinforced concrete has small volume, is convenient for site construction, is convenient to chisel and clean, and can save the construction cost.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 to 3 are schematic step views of a supporting wall early-dismantling construction method for a deep and shallow foundation pit according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a bottom plate before a supporting wall is removed according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a bottom plate with a removed supporting wall according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a completed base plate according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 6, the invention provides an early demolition construction method for a supporting wall of a deep and shallow foundation pit, comprising the following steps:
s1: divide first major structure 1 in the deep basal pit A into substructure 11 and superstructure, the top elevation of substructure 11 is higher than the 2 elevations of bottom plate of shallow basal pit B to substructure 11 and bottom plate 2 are under construction earlier, make substructure 11 support in the one side of keeping away from shallow basal pit B of buttress wall 3.
Before the bottom plate 2 is constructed, a cushion layer 21 is poured at the bottom of the shallow foundation pit B, and a water stop strip is installed between the cushion layer 21 and the supporting wall 3.
Specifically, the step of constructing the floor panel 2 includes:
paving a waterproof layer on the cushion layer 21, and reserving an upturned section 221 upwards in the waterproof layer along the wall surface direction of the support wall 3;
pouring the bottom plate 2 on the waterproof layer, forming a gap 20 at one end of the bottom plate 2 close to the supporting wall 3, and implanting the main ribs 23 of the bottom plate 2 into the operation supporting wall 3.
S2: after the substructure 11 is supported on the retaining wall 3, the diagonal braces 5 are constructed in the shallow pit B such that the diagonal braces 5 are supported on the side walls of the floor 2 and the side of the shallow pit B remote from the retaining wall 3.
The method comprises the following steps of constructing the inclined strut 5 in the shallow foundation pit B:
constructing an outer wall 4 of a second main structure 8 on one side of the bottom plate 2 far away from the supporting wall 3, wherein the outer wall 4 is abutted against the side wall of the shallow foundation pit B;
and pouring the inclined strut 5 on the bottom plate 2, so that the inclined strut 5 is supported between the bottom plate 2 and the outer wall 4.
In a preferred embodiment, a concrete gusset 6 is cast between the root of the outer wall 4 and the bottom plate 2, and the concrete gusset 6 is disposed directly below the diagonal brace 5.
S3: and (4) removing horizontal inner supports in the deep foundation pit A and the shallow foundation pit B.
S4: and (4) removing the supporting wall 3 above the position of the bottom plate 2.
After the supporting wall 3 above the position of the bottom plate 2 is removed, the upturned section 221 is laid on the upper end surface of the rest of the supporting wall 3;
concrete is poured into the upturned section 221 and the notch 20 laid on the upper end face to fill the bottom plate 2, and the main reinforcement 23 of the bottom plate 2 is implanted into the side wall 111 of the lower layer structure 11.
S5: and meanwhile, an upper layer structure is continuously constructed on a lower layer structure in the deep foundation pit A, and a second main structure 8 is constructed in the shallow foundation pit B, so that the second main structure 8 and the upper layer structure are connected into a whole.
In the invention, the main structure in the deep foundation pit is divided into two parts, namely an upper layer structure corresponding to the position of the second main structure of the shallow foundation pit and a lower layer structure arranged below the upper layer structure. The lower layer structure is constructed firstly, and the upper layer structure and the second main body structure are constructed simultaneously. Before an upper layer structure and a second main body structure are constructed simultaneously, two horizontal inner supports (temporary steel support replacement) in a deep and shallow foundation pit are changed into inclined supports of reinforced concrete. By adopting the processes of early dismantling and synchronous dismantling of the supporting wall and the first and second supports, the upper layer structure and the second main body structure can be constructed synchronously. When the shallow foundation pit is constructed to the bottom plate, in order to ensure the force transmission outside the foundation pit, advanced water stopping measures are taken for the shallow foundation pit in the IV-4 area, and reinforced concrete gusset plates are added to strengthen the weak position of the bottom.
When the bottom plate is constructed in the shallow foundation pit, the cushion layer of the bottom plate within 2m from the supporting wall needs to be thickened and reinforced. After the cushion layer is poured, the bottom plate within a range of 1m away from the supporting wall needs to be poured in batches, the thickness of the bottom plate is only 300mm for the first time, the main reinforcements of the bottom row of the bottom plate need to be embedded into the supporting wall, the anchor is embedded for 15d, the ends of the embedded reinforcements are sheathed with threads, and the outer sleeve reinforcement sleeves are connected with the main reinforcements of the bottom row.
And after the first pouring construction of the bottom plate is completed and the maintenance is completed, removing the third steel support, performing outer wall construction, and constructing the inclined strut of the reinforced concrete when the outer wall construction reaches the position 500mm below the second steel support. And after the construction of the inclined strut of the reinforced concrete is finished, synchronously dismantling the supporting wall and the first support and the second support. The support is dismantled from bottom to top, and the support wall is dismantled from top to bottom. The superstructure and the second body structure can now be constructed simultaneously.
The support wall is dismantled in two times, and the support wall is continuously dismantled to the elevation position of the top surface of the bottom plate for the first time, so that the stress of the support structure of the shallow foundation pit can be effectively transmitted to the support wall and then transmitted to the first main structure of the deep foundation pit. After the first and second supports of the shallow foundation pit are removed and the construction of the B1 layer structure is completed (the top plates of the first main body structure and the second main body structure are connected), the supporting wall is removed for the second time, the elevation of the bottom surface of the bottom plate of the shallow foundation pit needs to be removed for the second time (the protection anchor is noticed to enter the bottom row of ribs of the foundation bottom plate of the supporting wall), the filling plain concrete between the side wall of the deep foundation pit and the supporting wall is removed at the same time, the surface of the side wall is chiseled, the bottom row of ribs of the bottom plate of the shallow foundation pit is anchored into the side wall of the deep foundation pit, and the bottom plate is poured for the second time to complete the bottom plate of the shallow foundation pit and maintenance.
And after the top plates of the first main body structure and the second main body structure are connected and maintained and reach 85% of the design strength, the reinforced concrete diagonal bracing can be chiseled manually, and the steel bar concrete diagonal bracing is cleaned and taken out of the field.
The early-dismantling construction method for the supporting wall of the deep and shallow foundation pit realizes synchronous dismantling and early-dismantling construction of the first support and the second support of the deep and shallow foundation pit and the supporting wall, is convenient for construction of a main structure, reduces construction cost, greatly saves construction period, utilizes space-time effect, and reduces adverse effects on existing peripheral underground structures (such as subways and tunnels). The inclined strut is adopted to directly transmit the stress of the supporting structure of the shallow foundation pit to the bottom plate of the shallow foundation pit and then to the main structure, and the force transmission path is more direct and safe. On the other hand, the inclined strut of the reinforced concrete has small volume, is convenient for site construction, is convenient to chisel and clean, and can save the construction cost.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (6)
1. A construction method for early dismantling of a supporting wall of a deep and shallow foundation pit is characterized by comprising the following steps:
dividing a first main structure in the deep foundation pit into a lower-layer structure and an upper-layer structure, wherein the top elevation of the lower-layer structure is higher than the bottom plate elevation of the shallow foundation pit, and constructing the lower-layer structure and the bottom plate firstly, so that the lower-layer structure is supported on one side of the supporting wall, which is far away from the shallow foundation pit;
after the lower-layer structure is supported on the supporting wall, constructing an inclined strut in the shallow foundation pit, so that the inclined strut is supported on the bottom plate and the side wall of the side, far away from the supporting wall, of the shallow foundation pit;
removing horizontal inner supports in the deep foundation pit and the shallow foundation pit;
removing the supporting wall above the position of the bottom plate;
and simultaneously constructing the upper layer structure in the deep foundation pit and constructing a second main body structure in the shallow foundation pit, so that the second main body structure and the upper layer structure are connected into a whole.
2. The early demolition construction method of a retaining wall of a deep and shallow foundation pit according to claim 1, wherein before the bottom plate is constructed, a cushion layer is poured at the bottom of the shallow foundation pit, and a water stop strip is installed between the cushion layer and the retaining wall.
3. The early-dismantling construction method for the supporting wall of the deep and shallow foundation pit as claimed in claim 2, wherein the step of constructing the bottom plate comprises:
paving a waterproof layer on the cushion layer, and reserving an upturned section on the waterproof layer along the wall surface direction of the support wall;
and pouring the bottom plate on the waterproof layer, forming a notch at one end of the bottom plate close to the supporting wall, and implanting the main rib of the bottom plate into the operation supporting wall.
4. The early demolition construction method for the supporting wall of the deep and shallow foundation pit according to claim 3, wherein after the supporting wall above the bottom plate position is demolished, the upturned section is laid on the upper end surface of the remaining supporting wall;
and pouring concrete in the upturned section paved on the upper end surface and the notch to complete the bottom plate, and implanting main ribs of the bottom plate into the side wall of the lower layer structure.
5. The early demolition construction method for the supporting wall of the deep and shallow foundation pit as claimed in claim 1, wherein the step of constructing the diagonal brace in the shallow foundation pit comprises:
constructing an outer wall of the second main body structure on one side of the bottom plate far away from the supporting wall, wherein the outer wall is abutted against the side wall of the shallow foundation pit;
and pouring the inclined strut on the bottom plate, so that the inclined strut is supported between the bottom plate and the outer wall.
6. The early demolition construction method of a supporting wall of a deep and shallow foundation pit as claimed in claim 5, wherein a concrete gusset plate is poured between the root of the outer wall and the bottom plate, and the concrete gusset plate is disposed right below the diagonal brace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210391371.1A CN114809087A (en) | 2022-04-14 | 2022-04-14 | Early-dismantling construction method for supporting wall of deep and shallow foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210391371.1A CN114809087A (en) | 2022-04-14 | 2022-04-14 | Early-dismantling construction method for supporting wall of deep and shallow foundation pit |
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| CN114809087A true CN114809087A (en) | 2022-07-29 |
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| CN202210391371.1A Pending CN114809087A (en) | 2022-04-14 | 2022-04-14 | Early-dismantling construction method for supporting wall of deep and shallow foundation pit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002953A (en) * | 2010-12-02 | 2011-04-06 | 上海市第四建筑有限公司 | Method for changing support of foundation pit enclosing rib plates |
| CN205024690U (en) * | 2015-08-11 | 2016-02-10 | 中建二局第三建筑工程有限公司 | Additional strengthening is propped in tearing open of supporting in deep basal pit |
| CN107386298A (en) * | 2017-07-19 | 2017-11-24 | 中铁第四勘察设计院集团有限公司 | A kind of depth hole composite supporting construction and its construction method with water-proof function |
| CN214245749U (en) * | 2020-12-16 | 2021-09-21 | 中国建筑第八工程局有限公司 | Support replacing structure for deep and shallow foundation pit construction |
| CN113756331A (en) * | 2021-10-14 | 2021-12-07 | 中国建筑第八工程局有限公司 | Synchronous construction method of adjacent foundation pits |
-
2022
- 2022-04-14 CN CN202210391371.1A patent/CN114809087A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002953A (en) * | 2010-12-02 | 2011-04-06 | 上海市第四建筑有限公司 | Method for changing support of foundation pit enclosing rib plates |
| CN205024690U (en) * | 2015-08-11 | 2016-02-10 | 中建二局第三建筑工程有限公司 | Additional strengthening is propped in tearing open of supporting in deep basal pit |
| CN107386298A (en) * | 2017-07-19 | 2017-11-24 | 中铁第四勘察设计院集团有限公司 | A kind of depth hole composite supporting construction and its construction method with water-proof function |
| CN214245749U (en) * | 2020-12-16 | 2021-09-21 | 中国建筑第八工程局有限公司 | Support replacing structure for deep and shallow foundation pit construction |
| CN113756331A (en) * | 2021-10-14 | 2021-12-07 | 中国建筑第八工程局有限公司 | Synchronous construction method of adjacent foundation pits |
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