CN114941333A - Secondary support replacing construction method for deep foundation pit adjacent to subway - Google Patents
Secondary support replacing construction method for deep foundation pit adjacent to subway Download PDFInfo
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- CN114941333A CN114941333A CN202210795251.8A CN202210795251A CN114941333A CN 114941333 A CN114941333 A CN 114941333A CN 202210795251 A CN202210795251 A CN 202210795251A CN 114941333 A CN114941333 A CN 114941333A
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- support
- subway
- inclined support
- foundation pit
- deep foundation
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- 238000010276 construction Methods 0.000 title claims abstract description 50
- 239000002689 soil Substances 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 239000003337 fertilizer Substances 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 4
- 239000010959 steel Substances 0.000 claims abstract description 4
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000009412 basement excavation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005096 rolling process 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
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The application provides a secondary support replacing construction method for a deep foundation pit adjacent to a subway, which comprises the following steps: after the construction of the fender pile and the crown beam of the deep foundation pit is finished, the embedded part is kept on the crown beam; excavating earthwork to a foundation bottom plate, and reserving a triangular soil body below the inclined strut; binding the steel bars of the foundation slab by a plate, and embedding a slab support; installing a first inclined support, wherein the upper part of the first inclined support is connected to the crown beam embedded part, and the lower part of the first inclined support is fixed on the bottom plate support; excavating a triangular soil body below the first inclined support, and constructing the triangular soil body to a foundation bottom plate and an outer wall; constructing a force transmission belt and backfilling a fertilizer groove; erecting a second inclined support in the structure, and dismantling the first inclined support; and removing the inner second inclined support. The construction progress of the adjacent operation subway on one side of the foundation pit and the normal operation of the subway are effectively guaranteed through the secondary support replacing technology.
Description
Technical Field
The application relates to the technical field of civil engineering, in particular to a secondary support replacing construction method adjacent to a subway deep foundation pit.
Background
The method is characterized in that the site deep foundation pit excavation is carried out at a special position adjacent to a subway transfer station, the side pressure of the subway is reduced generally, the structural system and the surrounding environment of the subway are in a changing and unstable state, the construction period is long, and the operation safety of the subway cannot be ensured due to the influence of factors such as unpredictability of natural environment factors and the like.
Disclosure of Invention
The application provides a secondary support changing construction method adjacent to a subway deep foundation pit, a secondary support changing method is adopted in the deep foundation pit excavation process, the support pressure on the side wall of the subway is always kept, and the construction progress and the normal operation of the subway are effectively guaranteed.
The application provides a secondary support replacing construction method adjacent to a subway deep foundation pit, which comprises the following steps:
after the construction of the fender pile and the crown beam of the deep foundation pit is finished, the embedded part is kept on the crown beam;
excavating earthwork to a foundation bottom plate, and reserving a triangular soil body below the inclined strut;
binding the steel bars of the foundation slab by a plate, and embedding a slab support;
installing a first inclined support, wherein the upper part of the first inclined support is connected to the crown beam embedded part, and the lower part of the first inclined support is fixed on the bottom plate support;
excavating a triangular soil body below the first inclined support, and constructing to the foundation bottom plate and the outer wall;
constructing a force transmission belt and backfilling a fertilizer groove;
erecting a second inclined support in the structure, and dismantling the first inclined support;
removing the second inclined support inside;
and backfilling the fertilizer groove, and removing the embedded bottom plate support.
In some embodiments, at said step: after the second diagonal bracing in the erection structure, the strength of the force transmission belt is detected, and after the force transmission belt reaches the preset strength, the first diagonal bracing is detached.
In some embodiments, the step of: before dismantling inside the second bearing diagonal, still including detecting floor concrete strength, after the floor concrete strength reaches the construction standard, dismantle the second bearing diagonal.
The application provides a secondary of neighbouring subway deep basal pit trades and props construction method, trade through the secondary and prop the technique and can avoid the in-process of foundation ditch construction and shake because of the operation of subway and lead to foundation ditch fender pile to produce the problem, realize effective support to subway underground continuous wall through the bearing diagonal simultaneously, avoid causing the continuous wall to appear the quality problem because of the pressure that the subway operation produced, the construction quality of whole basement structure has been improved effectively, the construction progress is improved, the construction degree of difficulty is reduced, manpower and material resources cost have been saved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of a secondary support replacing structure of a secondary support replacing construction method for an adjacent subway deep foundation pit, which is provided by the application;
fig. 2 is a schematic view of an embedded part left on a crown beam in the secondary support replacement construction method adjacent to a subway deep foundation pit provided by the application;
fig. 3 is a schematic view of a triangular soil body below a reserved diagonal bracing position in the secondary bracing-replacing construction method for the adjacent subway deep foundation pit provided by the application;
fig. 4 is a schematic view of the secondary support replacement construction method adjacent to the subway deep foundation pit provided by the application after excavating a triangular soil body below the first diagonal support;
fig. 5 is a schematic view of a second inclined support in an erection structure in the secondary support replacement construction method for the adjacent subway deep foundation pit provided by the present application;
fig. 6 is a schematic view illustrating that the inner second diagonal brace is being removed in the secondary support replacement construction method adjacent to the subway deep foundation pit provided by the application;
fig. 7 is a schematic diagram of the construction method for replacing the support of the subway near the deep foundation pit for the second time after backfilling the fertilizer groove and removing the embedded bottom plate support.
The construction method comprises the following steps of 1-fender pile, 2-crown beam, 3-foundation slab, 4-slab support, 5-first inclined support, 6-outer wall, 7-construction force transmission belt and 8-second inclined support.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to better understand the technical scheme of the present application, the following detailed description is provided for the person skilled in the art with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, fig. 1 is a schematic view of a secondary support replacing structure of a secondary support replacing construction method for an adjacent subway deep foundation pit provided by the present application.
The application provides a secondary support replacing construction method adjacent to a subway deep foundation pit, which comprises the following steps:
firstly, after the construction of a deep foundation pit fender pile 1 and a crown beam 2 is finished, an embedded part is left on the crown beam 2;
excavating earthwork to the foundation slab 3, and reserving a triangular soil body below the inclined strut;
thirdly, binding the reinforcing steel bars of the foundation slab 3 and embedding the slab support 4 in advance;
step four, mounting a first inclined support 5, wherein the upper part of the first inclined support 5 is connected to an embedded part of the crown beam 2, and the lower part of the first inclined support 5 is fixed on the bottom plate support 4;
fifthly, excavating a triangular soil body below the first inclined support 5, and constructing the triangular soil body to the foundation bottom plate 3 and the outer wall 6;
sixthly, constructing a force transmission belt and backfilling a fertilizer groove;
seventhly, erecting a second inclined support 8 in the structure, and dismantling the first inclined support 5;
and step eight, backfilling the rich soil, and removing the embedded bottom plate support 4.
Referring to fig. 2, fig. 2 is a schematic view of an embedded part being left on a crown beam in the secondary support replacement construction method of a deep foundation pit adjacent to a subway provided by the present application.
In the first step, after the construction of the deep foundation pit fender pile 1 and the crown beam 2 is completed, the embedded part is left on the crown beam 2.
Referring to fig. 3, fig. 3 is a schematic view of a triangular soil body below a reserved inclined strut position in the secondary support replacing construction method for the adjacent subway deep foundation pit provided by the present application.
And in the second step, excavating the earthwork, excavating the soil body away from the outer side of the subway protection line, excavating the side soil body far away from the subway to the foundation bottom plate 3, and reserving the triangular soil body below the diagonal bracing position.
In the third step, in the process of rolling the steel rib plate of the foundation slab 3, the slab support 4 is embedded in the foundation slab 3 so as to fix the tail end of the first inclined strut 5.
In the fourth step, a first inclined strut 5 is installed on the inclined edge of the triangular soil body, the first inclined strut 5 is installed in an inclined mode, the top end of the first inclined strut 5 is connected with an embedded part in the crown beam 2, and the bottom end of the first inclined strut 5 is connected with an embedded bottom plate support 4.
Referring to fig. 4, fig. 4 is a schematic view of the excavated triangular soil body below the first diagonal brace in the secondary support replacement construction method for the adjacent subway deep foundation pit.
In the fifth step, after the first inclined struts 5 are completely supported, excavating a triangular soil body below the first inclined struts 5, constructing the foundation slab 3 and the outer wall 6, constructing a construction force transmission belt 7 after the construction of the outer wall 6 is completed, and backfilling a fertilizer groove.
Referring to fig. 5, fig. 5 is a schematic view of a second inclined support in an erection structure in the secondary support replacing construction method for a deep foundation pit adjacent to a subway provided by the present application.
In the sixth step, the second inclined strut 8 is erected, the second inclined strut 8 is arranged on the inner side of the first inclined strut 5, and then the first inclined strut 5 is removed.
Referring to fig. 6, fig. 6 is a schematic view illustrating the dismantling of the inner second diagonal brace in the secondary support replacing construction method for the adjacent subway deep foundation pit.
In the seventh step, after a certain construction requirement is met, the second inclined support 8 inside is removed.
Referring to fig. 7, fig. 7 is a schematic diagram of the secondary support replacement construction method adjacent to the subway deep foundation pit after backfilling the fertilizer groove and removing the embedded bottom plate support.
And step eight, residual operation construction, backfilling the fertilizer groove and removing the embedded base.
The core of the application lies in that in the process of deep foundation pit excavation, a secondary support replacing method is adopted to ensure that the supporting force is always formed on the side wall of the subway, the structural system and the surrounding environment of the subway are maintained to be in a stable state, and the safe operation of the subway is ensured.
In the following steps: after second bearing diagonal 8 in the frame structure, still including detecting construction power transmission belt 7 intensity, construction power transmission belt 7 reaches and predetermines intensity after, demolishs first bearing diagonal 5 again to guarantee that construction security and structural strength meet the demands.
In the following steps: before dismantling inside second bearing diagonal 8, still including detecting floor concrete strength, after the floor concrete strength reaches the construction standard, dismantle second bearing diagonal 8 again.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The secondary support replacing construction method for the adjacent subway deep foundation pit provided by the application is described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (3)
1. A secondary support replacing construction method adjacent to a subway deep foundation pit is characterized by comprising the following steps:
after the construction of the deep foundation pit fender post (1) and the crown beam (2) is finished, the embedded part is kept on the crown beam (2);
excavating earthwork to the foundation slab (3), and reserving a triangular soil body below the inclined strut;
plate-binding foundation slab steel bars, and embedding a slab support (4);
installing a first inclined support (5), wherein the upper part of the first inclined support (5) is connected to a crown beam embedded part, and the lower part of the first inclined support is fixed on the bottom plate support (4);
excavating a triangular soil body below the first inclined support (5), and constructing to the foundation bottom plate (3) and the outer wall (6);
constructing a force transmission belt (7) and backfilling a fertilizer groove;
a second inclined support (8) in the erection structure, and the first inclined support (5) is dismantled;
removing the inner second inclined strut (8);
and backfilling the fertilizer groove, and removing the embedded bottom plate support (4).
2. The secondary support replacing construction method adjacent to the subway deep foundation pit according to claim 1, wherein in the step: after a second inclined support (8) in the erection structure, the strength of a force transmission belt is detected, and after the force transmission belt reaches the preset strength, the first inclined support (5) is detached.
3. The secondary support replacing construction method adjacent to the subway deep foundation pit as claimed in claim 2, wherein said steps are: before removing inside second bearing diagonal (8), still including detecting floor concrete strength, after the floor concrete strength reaches the construction standard, remove second bearing diagonal (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795251.8A CN114941333A (en) | 2022-07-07 | 2022-07-07 | Secondary support replacing construction method for deep foundation pit adjacent to subway |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795251.8A CN114941333A (en) | 2022-07-07 | 2022-07-07 | Secondary support replacing construction method for deep foundation pit adjacent to subway |
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| CN114941333A true CN114941333A (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210795251.8A Pending CN114941333A (en) | 2022-07-07 | 2022-07-07 | Secondary support replacing construction method for deep foundation pit adjacent to subway |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115387346A (en) * | 2022-09-21 | 2022-11-25 | 安徽省城建基础工程有限公司 | Method for taking soil from below earthwork of foundation pit inner wall diagonal brace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113463650A (en) * | 2021-06-25 | 2021-10-01 | 中铁一局集团厦门建设工程有限公司 | Foundation pit inclined support system and foundation pit inner support construction method |
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2022
- 2022-07-07 CN CN202210795251.8A patent/CN114941333A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113463650A (en) * | 2021-06-25 | 2021-10-01 | 中铁一局集团厦门建设工程有限公司 | Foundation pit inclined support system and foundation pit inner support construction method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115387346A (en) * | 2022-09-21 | 2022-11-25 | 安徽省城建基础工程有限公司 | Method for taking soil from below earthwork of foundation pit inner wall diagonal brace |
| CN115387346B (en) * | 2022-09-21 | 2023-06-09 | 安徽省城建基础工程有限公司 | Soil sampling method for earthwork under inclined strut on inner wall of foundation pit |
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Application publication date: 20220826 |