CN113756331A - Synchronous construction method of adjacent foundation pits - Google Patents
Synchronous construction method of adjacent foundation pits Download PDFInfo
- Publication number
- CN113756331A CN113756331A CN202111198878.7A CN202111198878A CN113756331A CN 113756331 A CN113756331 A CN 113756331A CN 202111198878 A CN202111198878 A CN 202111198878A CN 113756331 A CN113756331 A CN 113756331A
- Authority
- CN
- China
- Prior art keywords
- foundation pit
- wall
- pouring
- bottom plate
- foundation
- 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
Images
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
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Foundations (AREA)
Abstract
The invention provides a synchronous construction method of adjacent foundation pits, which comprises the following steps: constructing and forming an intermediate wall, excavating a region to be formed into a first foundation pit and a second foundation pit, supporting a plurality of dry concrete supports in the first foundation pit along the excavation depth, and supporting a plurality of steel supports in the second foundation pit; pouring a first floor slab at a position corresponding to the bottom surface of the second foundation pit in the first foundation pit, and pouring a second bottom plate at the bottom of the second foundation pit; removing the steel support below the steel support at the topmost part in the second foundation pit, and pouring on the top surface of the second bottom plate to form a protective wall; supporting a plurality of inclined struts obliquely between the protective wall and the second bottom plate, and dismantling the steel support positioned at the topmost part; and removing the part of the middle partition wall higher than the bottom surface of the second foundation pit, removing the concrete support, and pouring concrete between the first floor slab and the second bottom plate to form a connecting section. According to the invention, the side wall of the foundation pit is propped up by the inclined strut, so that part of the intermediate wall can be conveniently removed, and the synchronous construction can be conveniently carried out at the position with the same elevation as that of the second foundation pit.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a synchronous construction method of adjacent foundation pits.
Background
After the bottom plate construction of second foundation ditch was accomplished, through adopting the level to trade the support temporarily one, in order to ensure the stability and the security of foundation ditch, this technique not only leads to the second foundation ditch, the major structure in the first foundation ditch can not be under construction in step, and the construction difficulty, the extension construction period, increase the adverse effect to subway and tunnel, still increase construction cost simultaneously, and this mode treats after the underground structure construction is accomplished, the degree of difficulty of demolising of mesophragma diaphragm wall is great, the danger coefficient is high, and is with high costs, the time limit for a project is longer, probably influence the important computer lab construction of basement.
Disclosure of Invention
In view of the above situation, the invention provides a synchronous construction method for adjacent foundation pits, which solves the technical problems that synchronous construction is difficult and the construction period is long in the traditional foundation pit construction process, and the inclined strut is formed by construction at the position of the second foundation pit so as to conveniently support the side wall of the foundation pit, so that part of the intermediate wall is conveniently detached, synchronous construction is conveniently carried out at the position with the same elevation as the second foundation pit, and the construction quality of the foundation pit is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a synchronous construction method of adjacent foundation pits is provided, a first foundation pit to be formed is communicated with a second foundation pit, and the bottom elevation of the first foundation pit is lower than that of the second foundation pit, and the method comprises the following steps:
constructing between a first foundation pit and a second foundation pit to be formed to form an intermediate wall;
providing a plurality of dry concrete supports, excavating an area to be formed with a first foundation pit, and supporting a plurality of concrete supports between the intermediate wall and the side wall of the first foundation pit opposite to the intermediate wall from top to bottom along the excavation depth;
providing a plurality of steel supports, excavating an area to be formed with a second foundation pit, and supporting a plurality of steel supports between the intermediate wall and the side wall of the second foundation pit opposite to the intermediate wall from top to bottom along the excavation depth;
pouring a first floor slab at a position corresponding to the bottom surface of the second foundation pit in the first foundation pit, and pouring a second bottom plate at the bottom of the second foundation pit;
removing a plurality of steel supports below the steel support at the top in the second foundation pit, and pouring to form a protective wall at the position, close to the side wall of the second foundation pit, of the top surface of the second bottom plate, wherein the top surface of the protective wall is flush with the top of the second foundation pit;
providing a plurality of inclined struts, obliquely supporting the inclined struts between the protective wall and the second bottom plate, removing the steel support positioned at the topmost part, pouring concrete at the position of the protective wall corresponding to the steel support positioned at the topmost part to form a grouting layer, wherein the side surfaces of the grouting layer are flush with the side surfaces corresponding to the protective wall;
and removing the part of the middle partition wall higher than the bottom surface of the second foundation pit, removing a plurality of concrete supports, and pouring concrete between the first floor slab and the second bottom plate to form a connection section, so as to connect the first floor slab and the second bottom plate.
The further improvement of the synchronous construction method of the adjacent foundation pits of the invention is that the method also comprises the following steps:
pouring concrete between the topmost steel supports and below the topmost steel supports to form a protective wall, so that a concave pit which is downwards concave is formed at the position, corresponding to the topmost steel supports, of the protective wall;
supporting a plurality of inclined struts between the protective wall and the second bottom plate in an inclined manner, wherein the inclined struts are flush with the steel support at the topmost part;
and removing the steel support at the topmost part, and pouring concrete at the position corresponding to the pit to form a grouting layer, wherein the side surface of the grouting layer is flush with the side surface of the protective wall, and the top surface of the grouting layer is flush with the top surface of the protective wall.
The synchronous construction method of the adjacent foundation pits is further improved in that before the second bottom plate is formed by construction, the method further comprises the following steps:
and pouring the bottom of the second foundation pit to form a second cushion layer, pouring the top of the second cushion layer to form a second bottom plate, and enabling the top of the second bottom plate to be flush with the top of the first floor slab.
The synchronous construction method of the adjacent foundation pits is further improved in that the position, close to the intermediate wall, of the bottom surface of the second foundation pit is sunken downwards to form a pit;
and providing a plurality of reinforcing ribs, arranging the reinforcing ribs in the pits, further pouring concrete at the bottoms of the pits and the second foundation pit to form a second cushion layer, and embedding the reinforcing ribs in the second cushion layer.
The further improvement of the synchronous construction method of the adjacent foundation pits of the invention is that the method also comprises the following steps:
providing a plurality of planting bars, arranging the planting bars at the top of the second cushion layer at intervals, and anchoring the end part of the middle partition wall of the planting bar frame in the middle partition wall;
and pouring to form a second bottom plate, and embedding the embedded steel bars in the second bottom plate so as to fixedly connect the second bottom plate and the partition wall.
The further improvement of the synchronous construction method of the adjacent foundation pits of the invention is that the method also comprises the following steps:
providing a plurality of connecting ribs, and arranging the connecting ribs on the top of the embedded ribs at intervals;
and pouring the top surface of the second cushion layer and the positions corresponding to the embedded bars and the connection bars to form a second bottom plate, wherein the positions of the second bottom plate corresponding to the connection bars, which are close to the end part of the intermediate wall, are sunken downwards to form a groove, and the connection bars are exposed outwards through the groove to be connected with the first floor plate.
The further improvement of the synchronous construction method of the adjacent foundation pits of the invention is that the method also comprises the following steps:
arranging a reinforcement cage at the position of a first floor to be formed, pouring concrete at the position corresponding to the reinforcement cage to form the first floor, wherein a gap is formed between the end part of the first floor and the intermediate wall, part of the reinforcement cage protrudes out of the end part of the first floor to form a protruding section, and pouring a support changing belt between the first floor and the intermediate wall, so that the protruding section is embedded in the support changing belt, and the intermediate wall is removed;
chiseling the support changing belt to expose the protruding section, further fixedly connecting the protruding section with the connecting rib, and further pouring concrete at the position corresponding to the protruding section and the connecting rib to form the connecting section, thereby connecting the first floor and the second bottom plate.
The further improvement of the synchronous construction method of the adjacent foundation pits of the invention is that the method also comprises the following steps:
constructing the side wall of the first foundation pit far away from the second foundation pit to form a retaining wall;
and after the connection section is formed by pouring, constructing on the tops of the protective wall and the enclosure wall to form a top plate.
The further improvement of the synchronous construction method of the adjacent foundation pits of the invention is that the method also comprises the following steps:
pouring concrete at a position of the first foundation pit, which is close to the intermediate wall, to form a first side wall, wherein the top of the first side wall corresponds to the bottom surface of the second foundation pit, and a gap is formed between the first side wall and the intermediate wall;
removing the concrete support lower than the top elevation of the first side wall;
and constructing at the top of the first side wall to form a first floor slab, and filling a gap between the first side wall and the intermediate wall to form a filling layer after the first side wall is formed by construction.
The further improvement of the synchronous construction method of the adjacent foundation pits of the invention is that the method also comprises the following steps:
and pouring to form a first cushion layer at the bottom of the first foundation pit, pouring to form a first bottom plate at the top of the first cushion layer, and pouring to form a first side wall at the top surface of the first bottom plate.
According to the synchronous construction method of the adjacent foundation pits, the partition wall of the height part of the first foundation pit corresponding to the second foundation pit can be removed through the inclined strut, so that the first foundation pit and the second foundation pit are communicated to form a whole, the synchronous construction of the first foundation pit and the second foundation pit is facilitated, the construction period is saved, and the adverse effect of long-term construction on subways and tunnels is avoided; meanwhile, the inclined strut is small in size, facilitates field construction, and can save construction cost.
Drawings
Fig. 1 is a schematic diagram of adjacent foundation pits after diagonal braces are formed in the synchronous construction method.
Fig. 2 is a schematic view before an intermediate wall is removed in the synchronous construction method of adjacent foundation pits according to the present invention.
Fig. 3 is a schematic diagram before a connection section is formed in the synchronous construction method of adjacent foundation pits.
Fig. 4 is a schematic diagram after a connection section is formed in the synchronous construction method of adjacent foundation pits.
Fig. 5 is a schematic diagram after steel supports and concrete supports are constructed in the synchronous construction method of adjacent foundation pits according to the invention.
The correspondence of reference numerals to components is as follows: first foundation ditch 1, first bed course 11, first bottom plate 12, first side wall 13, filling layer 131, second floor 14, first floor 15, trade and prop area 151, first roof 16, concrete support 17, second foundation ditch 2, second bed course 21, strengthening rib 211, second bottom plate 22, bar 221 of planting, the muscle of plugging into 222, protective wall 23, second roof 24, steel shotcrete 25, bracing 3, mid-board 4, mid-board demolishs part 41, the section of plugging into 5.
Detailed Description
To facilitate an understanding of the present invention, the following description is made in conjunction with the accompanying drawings and examples.
Referring to fig. 1 to 5, the present invention provides a synchronous construction method of adjacent foundation pits, in which a first foundation pit 1 to be formed is communicated with a second foundation pit 2, and a bottom elevation of the first foundation pit 1 is lower than a bottom elevation of the second foundation pit 2, the construction method including:
constructing and forming an intermediate wall 4 between a first foundation pit 1 and a second foundation pit 2 to be formed;
providing a plurality of dry concrete supports 17, excavating an area to be formed into the first foundation pit 1, and supporting a plurality of concrete supports 17 between the intermediate wall 4 and the side wall of the first foundation pit 1 opposite to the intermediate wall 4 from top to bottom along the excavation depth;
providing a plurality of steel supports 25, excavating an area to be formed into the second foundation pit 2, and supporting the plurality of steel supports 25 between the intermediate wall 4 and the side wall of the second foundation pit 2 opposite to the intermediate wall 4 from top to bottom along the excavation depth;
pouring to form a first floor 15 at a position corresponding to the bottom surface of the second foundation pit 2 in the first foundation pit 1, and pouring to form a second bottom plate 22 at the bottom of the second foundation pit 2;
removing a plurality of steel supports 25 below the steel support at the topmost part in the second foundation pit 2, constructing a protective wall 23 at the position close to the side wall of the second foundation pit 2 and on the top surface of the second bottom plate 22, wherein the top surface of the protective wall 23 is flush with the top part of the second foundation pit 2;
providing a plurality of inclined struts 3, obliquely supporting the inclined struts 3 between a protective wall 23 and a second bottom plate 22, removing a steel support 25 positioned at the topmost part, pouring concrete at the positions of the protective wall 23 corresponding to the steel support 25 positioned at the topmost part to form a grouting layer, wherein the side surfaces of the grouting layer are flush with the corresponding side surfaces of the protective wall 23;
and removing the part of the intermediate wall 4 higher than the bottom surface of the second foundation pit 2, removing the concrete support 17, pouring concrete between the first floor 15 and the second floor 22 to form a connection section 5, and connecting the first floor 15 and the second floor 22.
According to the synchronous construction method of the adjacent foundation pits, the middle partition wall 4 of the height part of the first foundation pit 1 corresponding to the second foundation pit 2 can be removed through the inclined strut 3, so that the first foundation pit 1 and the second foundation pit 2 are communicated to form a whole, the synchronous construction of the first foundation pit 1 and the second foundation pit 2 is facilitated, the construction period is greatly saved, and the adverse effect of long-term construction on subways and tunnels is avoided; meanwhile, the inclined strut 3 is small in size, so that the site construction is facilitated, and the construction cost can be saved.
Preferably, a reinforcement cage is provided in the first floor 15.
Preferably, the steel supports 25 are arranged in three rows at intervals in the vertical direction, and before the protective wall 23 is constructed, the two rows of steel supports 25 at the bottom are firstly removed, so that the protective wall 23 is constructed.
Preferably, as shown in fig. 1, the intermediate wall 4 is disposed at a connection portion of the first foundation pit 1 and the second foundation pit 2, so as to divide the first foundation pit 1 and the second foundation pit 2, thereby preventing the first foundation pit 1 from being supported by the large-span concrete corresponding to the second foundation pit 2, and preventing the large-span concrete from being used, when the large-span concrete is used, the concrete is easily dropped due to the influence of gravity and span, thereby effectively supporting the side wall of the foundation pit, after the first foundation pit portion is constructed to form the first side wall 13 and the first floor 15, the side wall of the first foundation pit 1 has been effectively supported, at this time, the steel support of the second foundation pit 2 can be replaced by the diagonal support which occupies a smaller space and does not need to use the intermediate wall 4, thereby facilitating the removal of the intermediate wall removing portion 41, and achieving the communication between the first foundation pit 1 and the second foundation pit 2.
As shown in fig. 1 and 5, a preferred embodiment of the method for synchronously constructing adjacent foundation pits of the present invention further includes:
pouring concrete between the topmost steel supports 25 and below the topmost steel supports to form the protective wall 23, so that a concave pit which is concave downwards is formed at the position of the protective wall 23 corresponding to the topmost steel supports 25;
obliquely supporting a plurality of inclined struts 3 between the protective wall 23 and the second bottom plate 22, wherein the inclined struts 3 are flush with the topmost steel support 25;
the topmost steel support 25 is removed and concrete is poured in the position corresponding to the pit to form a grout layer, the side surface of which is flush with the side surface of the protective wall 23 and the top surface of which is flush with the top surface of the protective wall 23.
Further, as shown in fig. 2 and 3, before the second bottom plate is formed, the method further includes:
and pouring to form a second cushion layer 21 at the bottom of the second foundation pit 2, pouring to form a second bottom plate 22 at the top of the second cushion layer 21, wherein the top of the second bottom plate 22 is flush with the top of the first floor 15.
Further, as shown in fig. 2 and 3, the bottom surface of the second foundation pit 2 is recessed downward at a position near the intermediate wall 4 to form a pit;
providing a plurality of reinforcing ribs 211, arranging the plurality of reinforcing ribs 211 in the pits, further pouring concrete at the bottoms of the pits and the second foundation pit 2 to form a second cushion layer 21, and embedding the reinforcing ribs 211 in the second cushion layer 21.
Preferably, the pit facilitates increasing a contact area between the second mat layer 21 and the intermediate wall 4, thereby facilitating transferring the soil pressure applied to the sidewall of the second foundation pit 2 to the intermediate wall 4 along the second mat layer 21, and facilitating maintaining the stability of the sidewall of the second foundation pit 2.
Further, as shown in fig. 2, the method further includes:
providing a plurality of planting bars 221, arranging the planting bars 221 at intervals on the top of the second cushion layer 21, and anchoring the end parts, close to the intermediate wall 4, of the planting bars 221 in the intermediate wall 4;
and pouring to form the second bottom plate 22, and embedding the embedded steel bars 221 in the second bottom plate 22, so that the second bottom plate 22 is fixedly connected with the partition wall 4.
Further, as shown in fig. 2, the method further includes:
providing a plurality of connecting ribs 222, and arranging the plurality of connecting ribs 222 at the top of the planting rib 221 at intervals;
and pouring the top surface of the second cushion layer 21 at the positions corresponding to the embedded bars 221 and the connection bars 222 to form a second bottom plate 22, wherein the position of the second bottom plate 22 corresponding to the end part of the connection bars 222 close to the intermediate wall 4 is recessed downwards to form a groove, and the connection bars 222 are exposed outwards through the groove to be connected with the first floor 15.
Further, as shown in fig. 1 and 2, the method further includes:
arranging a reinforcement cage at the position of a first floor 15 to be formed, pouring concrete at the position corresponding to the reinforcement cage to form the first floor 15, forming a gap between the end part of the first floor 15 and the intermediate wall 4, partially protruding out of the end part of the first floor 15 by the reinforcement cage to form a protruding section, pouring a support changing belt 151 between the first floor 15 and the intermediate wall 4 to enable the protruding section to be embedded in the support changing belt 151, and further removing the intermediate wall 4;
and chiseling the support changing belt 151 to expose the protruding section, fixedly connecting the protruding section with the connecting rib 222, and pouring concrete at the position corresponding to the protruding section and the connecting rib 222 to form a connecting section 5, so as to connect the first floor 15 and the second floor 22.
Preferably, the support-changing belt 151 is convenient for protecting the protruding section when the intermediate wall 4 is removed, and can transmit the acting force applied to the first floor 15 to the side wall, thereby maintaining the stability of the side wall of the first foundation pit 1.
Further, the method also comprises the following steps:
constructing the side wall of the first foundation pit 1 far away from the second foundation pit 2 to form a retaining wall;
and after the connection section 5 is formed by pouring, constructing on the top of the protective wall 23 and the enclosure wall to form a top plate.
Further, as shown in fig. 1, the method further includes:
pouring concrete at a position of the first foundation pit 1 close to the intermediate wall 4 to form a first side wall 13, wherein the first side wall 13 is flush with the bottom surface of the second foundation pit 2, and a gap is formed between the first side wall 13 and the intermediate wall 4; dismantling the concrete support 17 lower than the top elevation of the first side wall 13; a first floor 15 is formed on the top of the first side wall 13, and after the first side wall 13 is formed, a gap between the first side wall 13 and the middle partition wall is filled to form a filling layer 131.
Further, as shown in fig. 1, the method further includes: a first cushion layer 11 is formed by pouring at the bottom of the first foundation pit 1, a first bottom plate 12 is formed by pouring at the top of the first cushion layer 11, and a first side wall 13 is formed by constructing at the top of the first bottom plate 12.
Further, as shown in fig. 1, the method further includes: and pouring to form a second floor slab 14 at the position where the first foundation pit 1 is lower than the bottom elevation of the second foundation pit 2, wherein the second floor slab 14 is horizontal.
Specifically, still include: after the top plate is formed, the plurality of inclined struts 3 are dismantled.
Preferably, as shown in fig. 1, the ground elevation outside the first foundation pit 1 is higher than the ground elevation outside the second foundation pit 2, a height difference is formed between the first top plate 16 at the top of the first foundation pit 1 and the second top plate 24 at the top of the second foundation pit, and the first top plate 16 extends to the top of the second foundation pit 2 and then extends downwards to be connected with the second top plate 24, so as to seal the first foundation pit 1 and the second foundation pit 2.
Preferably, as shown in fig. 1, a second floor 14 is further formed at a position of the first foundation pit 1 corresponding to the middle portion of the first side wall 13.
The concrete implementation case of the invention is that an intermediate wall 4 is constructed and formed between a first foundation pit 1 and a second foundation pit 2 to be formed, a plurality of concrete supports 17 are provided, the area of the first foundation pit 1 to be formed is excavated, and a plurality of concrete supports 17 are erected between the intermediate wall 4 and the side wall of the first foundation pit 1 opposite to the intermediate wall 4 from top to bottom along the excavation depth;
providing a plurality of steel supports 25, excavating an area to be formed into the second foundation pit 2, and supporting the plurality of steel supports 25 between the intermediate wall 4 and the side wall of the second foundation pit 2 opposite to the intermediate wall 4 from top to bottom along the excavation depth;
pouring to form a first cushion layer 11 at the bottom of the first foundation pit 1, pouring to form a first bottom plate 12 at the top of the first cushion layer 11, constructing to form a first side wall 13 at a position, close to the side wall of the first foundation pit 1, at the top of the first bottom plate 12, filling a gap between the first side wall 13 and the middle partition wall 4 to form a filling layer 131, and constructing to form a retaining wall at the side wall of the first foundation pit 1, far away from the second foundation pit 2;
arranging a reinforcement cage at the position of a second floor slab 14 to be formed, pouring concrete at the position corresponding to the reinforcement cage to form the second floor slab 14, arranging the reinforcement cage at the position of a first floor slab 15 to be formed, pouring concrete at the position corresponding to the reinforcement cage to form the first floor slab 15, forming a gap between the end part of the first floor slab 15 and the middle partition wall 4, partially protruding out of the end part of the first floor slab 15 of the reinforcement cage to form a protruding section, and pouring a support changing belt 151 between the first floor slab 15 and the middle partition wall 4 to form a support changing belt 151, so that the protruding section is embedded in the support changing belt 151;
dismantling the concrete support 17 lower than the top elevation of the first side wall 13;
providing a plurality of reinforcing ribs 211, arranging the reinforcing ribs 211 in the pits, further pouring concrete at the bottoms of the pits and the second foundation pit 2 to form a second cushion layer 21, and embedding the reinforcing ribs 211 in the second cushion layer 21;
arranging a plurality of planting ribs 221 at intervals on the top of the second cushion layer 21, anchoring the part, corresponding to the planting ribs 221, of the intermediate wall 4 to the intermediate wall 4, arranging a plurality of connection ribs 222 at intervals on the top of the planting ribs 221, pouring on the top surface of the second cushion layer 21 and corresponding to the planting ribs 221 and the connection ribs 222 to form a second bottom plate 22, sinking the second bottom plate 22 corresponding to the connection ribs 222 close to the intermediate wall 4 downwards to form grooves, and protruding the connection ribs 222 into the grooves;
removing a plurality of steel supports 25 below the steel support at the topmost part in the second foundation pit 2;
pouring concrete between the topmost steel supports 25 and below the topmost steel supports to form the protective wall 23, so that a concave pit which is concave downwards is formed at the position of the protective wall 23 corresponding to the topmost steel supports 25;
obliquely supporting a plurality of inclined struts 3 between the protective wall 23 and the second bottom plate 22, wherein the inclined struts 3 are flush with the topmost steel support 25;
removing the topmost steel support 25, and pouring concrete at the position corresponding to the pit to form a grouting layer, wherein the side surface of the grouting layer is flush with the side surface of the protective wall 23, and the top surface of the grouting layer is flush with the top surface of the protective wall 23;
the portion of the intermediate wall 4 higher than the bottom surface of the second foundation pit 2 is removed, and the concrete braces 17 are removed,
chiseling the support changing belt 151 to expose the protruding section, fixedly connecting the protruding section with the connecting rib 222, and pouring concrete at a position corresponding to the protruding section and the connecting rib 222 to form a connecting section 5, so as to connect the first floor 15 and the second floor 22;
constructing and forming a first top plate 16 in a horizontal direction on the top of the first side wall 13, constructing and forming a second top plate 24 in a horizontal direction on the top of the protective wall 23, wherein a height difference is formed between the first top plate 16 on the top of the first foundation pit 1 and the second top plate 24 on the top of the second foundation pit, and the first top plate 16 extends to the top of the second foundation pit 2 and then extends downwards to be connected with the second top plate 24, so that the first foundation pit 1 and the second foundation pit 2 are closed;
the plurality of sprags 3 are removed.
While the present invention has been described in detail and with reference to the accompanying drawings and examples, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (10)
1. A synchronous construction method of adjacent foundation pits is characterized in that a first foundation pit and a second foundation pit to be formed are communicated, the bottom elevation of the first foundation pit is lower than the bottom elevation of the second foundation pit, and the construction method comprises the following steps:
constructing and forming an intermediate wall between the first foundation pit and the second foundation pit to be formed;
providing a plurality of dry concrete supports, excavating a region to be formed with the first foundation pit, and supporting a plurality of concrete supports between the intermediate wall and the side wall of the first foundation pit opposite to the intermediate wall from top to bottom along the excavation depth;
providing a plurality of steel supports, excavating an area to be formed with the second foundation pit, and supporting a plurality of steel supports between the intermediate wall and the side wall of the second foundation pit opposite to the intermediate wall from top to bottom along the excavation depth;
pouring a first floor slab at a position, corresponding to the bottom surface of the second foundation pit, in the first foundation pit, and pouring a second bottom plate at the bottom of the second foundation pit;
removing a plurality of steel supports below the steel support at the topmost part in the second foundation pit, and pouring a protective wall at a position on the top surface of the second bottom plate and close to the side wall of the second foundation pit, wherein the top surface of the protective wall is flush with the top of the second foundation pit;
providing a plurality of inclined struts, obliquely supporting the inclined struts between the protective wall and the second bottom plate, removing the steel support positioned at the topmost part, and pouring concrete at the position of the protective wall corresponding to the steel support positioned at the topmost part to form a grouting layer, wherein the side surface of the grouting layer is flush with the side surface corresponding to the protective wall;
and removing the part of the intermediate wall higher than the bottom surface of the second foundation pit, removing a plurality of concrete supports, and pouring concrete between the first floor slab and the second bottom plate to form a connection section, so as to connect the first floor slab and the second bottom plate.
2. The synchronous construction method of adjacent foundation pits according to claim 1, further comprising:
pouring concrete between the topmost steel supports and below the topmost steel supports to form the protective wall, so that a concave pit which is downwards concave is formed at the position, corresponding to the topmost steel supports, of the protective wall;
obliquely supporting a plurality of inclined struts between the protective wall and the second bottom plate, wherein the inclined struts are flush with the steel supports at the topmost part;
and removing the steel support at the topmost part, and pouring concrete at the position corresponding to the pit to form the grouting layer, wherein the side surface of the grouting layer is flush with the side surface of the protective wall, and the top surface of the grouting layer is flush with the top surface of the protective wall.
3. The synchronous construction method of adjacent foundation pits according to claim 1, wherein before the second bottom plate is constructed, the method further comprises:
and pouring the bottom of the second foundation pit to form a second cushion layer, pouring the top of the second cushion layer to form a second bottom plate, wherein the top of the second bottom plate is flush with the top of the first floor.
4. The synchronous construction method of adjacent foundation pits according to claim 3, wherein the bottom surface of the second foundation pit is recessed downward to form a pit at a position close to the intermediate wall;
and providing a plurality of reinforcing ribs, arranging the reinforcing ribs in the pits, further pouring concrete at the bottoms of the pits and the second foundation pit to form the second cushion layer, and embedding the reinforcing ribs in the second cushion layer.
5. The synchronous construction method of adjacent foundation pits according to claim 4, further comprising:
providing a plurality of planting bars, arranging the planting bars at the top of the second cushion layer at intervals, and anchoring the end parts, close to the intermediate wall, of the planting bars in the intermediate wall;
and pouring to form the second bottom plate, and embedding the embedded steel bars in the second bottom plate so as to fixedly connect the second bottom plate and the intermediate wall.
6. The synchronous construction method of adjacent foundation pits according to claim 5, further comprising:
providing a plurality of connecting ribs, and arranging the connecting ribs on the tops of the planted ribs at intervals;
and pouring the top surface of the second cushion layer and the positions corresponding to the embedded bars and the connection bars to form the second bottom plate, wherein the position of the second bottom plate corresponding to the end part of the connection bars close to the intermediate wall is sunken downwards to form a groove, and the connection bars are exposed outwards through the groove to be connected with the first floor.
7. The synchronous construction method of adjacent foundation pits according to claim 6, further comprising:
arranging a reinforcement cage at the position of a first floor to be formed, pouring concrete at the position corresponding to the reinforcement cage to form the first floor, wherein a gap is formed between the end part of the first floor and the intermediate wall, part of the reinforcement cage protrudes out of the end part of the first floor to form a protruding section, and pouring a support changing belt between the first floor and the intermediate wall, so that the protruding section is embedded in the support changing belt, and the intermediate wall is removed;
chiseling the support changing belt to expose the protruding section, fixedly connecting the protruding section with the connecting rib, and pouring concrete at the position corresponding to the protruding section and the connecting rib to form the connecting section, so as to connect the first floor slab and the second bottom plate.
8. The synchronous construction method of adjacent foundation pits according to claim 7, further comprising:
constructing the side wall of the first foundation pit far away from the second foundation pit to form a retaining wall;
and after the connection section is formed by pouring, constructing on the top of the protective wall and the enclosure wall to form a top plate.
9. The synchronous construction method of adjacent foundation pits according to claim 1, further comprising:
pouring concrete at a position of the first foundation pit, which is close to the intermediate wall, to form a first side wall, wherein the first side wall corresponds to the bottom surface of the second foundation pit, and a gap is formed between the first side wall and the intermediate wall;
removing the concrete support lower than the top elevation of the first side wall;
and constructing and forming the first floor on the top of the first side wall, and filling a gap between the first side wall and the intermediate wall to form a filling layer after the first side wall is formed by construction.
10. The synchronous construction method of adjacent foundation pits according to claim 9, further comprising:
and pouring to form a first cushion layer at the bottom of the first foundation pit, pouring to form a first bottom plate at the top of the first cushion layer, and pouring to form the first side wall at the top surface of the first bottom plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111198878.7A CN113756331A (en) | 2021-10-14 | 2021-10-14 | Synchronous construction method of adjacent foundation pits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111198878.7A CN113756331A (en) | 2021-10-14 | 2021-10-14 | Synchronous construction method of adjacent foundation pits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113756331A true CN113756331A (en) | 2021-12-07 |
Family
ID=78799495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111198878.7A Pending CN113756331A (en) | 2021-10-14 | 2021-10-14 | Synchronous construction method of adjacent foundation pits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113756331A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809087A (en) * | 2022-04-14 | 2022-07-29 | 中国建筑第八工程局有限公司 | Early-dismantling construction method for supporting wall of deep and shallow foundation pit |
| CN115404904A (en) * | 2022-06-23 | 2022-11-29 | 中国建筑第八工程局有限公司 | Underground diaphragm wall chamber-divided type dismantling construction method adjacent to subway foundation pit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1355039A1 (en) * | 2002-04-20 | 2003-10-22 | Hochtief Aktiengesellschaft | Method of constructing an extended free chamber between two tunnel segments |
| CN103590404A (en) * | 2012-08-13 | 2014-02-19 | 上海市政工程设计研究总院（集团）有限公司 | Method for supporting foundation pit next to established underground structure |
| CN104032744A (en) * | 2014-05-21 | 2014-09-10 | 中国建筑第八工程局有限公司 | Support replacing construction method in group pit project |
| CN109610466A (en) * | 2019-01-31 | 2019-04-12 | 长江勘测规划设计研究有限责任公司 | The asynchronous construction method of the built irregular deep basal pit in subway station two sides and structure |
| CN110318418A (en) * | 2019-06-13 | 2019-10-11 | 成都市建筑设计研究院 | A kind of open cut underground station strip accessory structure construction method |
| CN111058455A (en) * | 2019-11-29 | 2020-04-24 | 上海市建工设计研究总院有限公司 | Deep foundation pit supporting structure and deep foundation pit construction method |
| CN111395359A (en) * | 2020-04-27 | 2020-07-10 | 徐州市城市轨道交通有限责任公司 | Construction method for long and narrow type wind pavilion structure foundation pit subsection |
| 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 |
-
2021
- 2021-10-14 CN CN202111198878.7A patent/CN113756331A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1355039A1 (en) * | 2002-04-20 | 2003-10-22 | Hochtief Aktiengesellschaft | Method of constructing an extended free chamber between two tunnel segments |
| CN103590404A (en) * | 2012-08-13 | 2014-02-19 | 上海市政工程设计研究总院（集团）有限公司 | Method for supporting foundation pit next to established underground structure |
| CN104032744A (en) * | 2014-05-21 | 2014-09-10 | 中国建筑第八工程局有限公司 | Support replacing construction method in group pit project |
| CN109610466A (en) * | 2019-01-31 | 2019-04-12 | 长江勘测规划设计研究有限责任公司 | The asynchronous construction method of the built irregular deep basal pit in subway station two sides and structure |
| CN110318418A (en) * | 2019-06-13 | 2019-10-11 | 成都市建筑设计研究院 | A kind of open cut underground station strip accessory structure construction method |
| CN111058455A (en) * | 2019-11-29 | 2020-04-24 | 上海市建工设计研究总院有限公司 | Deep foundation pit supporting structure and deep foundation pit construction method |
| CN111395359A (en) * | 2020-04-27 | 2020-07-10 | 徐州市城市轨道交通有限责任公司 | Construction method for long and narrow type wind pavilion structure foundation pit subsection |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809087A (en) * | 2022-04-14 | 2022-07-29 | 中国建筑第八工程局有限公司 | Early-dismantling construction method for supporting wall of deep and shallow foundation pit |
| CN115404904A (en) * | 2022-06-23 | 2022-11-29 | 中国建筑第八工程局有限公司 | Underground diaphragm wall chamber-divided type dismantling construction method adjacent to subway foundation pit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101034398B1 (en) | Land-side protection wall that use ground structure | |
| CN105840207B (en) | Construction method for comprehensive tunnel entering structure of large-span tunnel penetrating shallow-buried bias-pressure loose accumulation body | |
| CN106088650B (en) | A kind of method and building suitable for building with brick-concrete structure underground increasing layer | |
| CN113756331A (en) | Synchronous construction method of adjacent foundation pits | |
| CN112554198B (en) | Construction method of deep foundation pit protection structure adjacent to high-rise building | |
| CN110777806B (en) | Multi-connecting-rod plane frame permanent supporting structure and construction process thereof | |
| CN106245927B (en) | A kind of method and building suitable for frame structure building underground increasing layer | |
| CN111119910A (en) | Tunnel collapse section back-blowing sand grouting backfill structure and construction method thereof | |
| CN102561721B (en) | Building jacking deviation rectifying method | |
| CN113550322A (en) | Enclosure system next to deep and shallow foundation pit and construction method | |
| CN109403350A (en) | Foundation pit supporting construction and foundation pit supporting method | |
| KR100805189B1 (en) | Construction method of underground structure characterized by going side by side wall construction and excavation | |
| CN209855277U (en) | Conversion layer structure for underground added layer of existing building | |
| CN1333139C (en) | Column supported underground continuous wall | |
| CN213143117U (en) | Assembled keyway basis retaining wall structure | |
| KR100976621B1 (en) | Construction method for basement extention | |
| CN202730796U (en) | Existing retaining wall rib plate type unloading reinforcing structure | |
| CN100443673C (en) | Method of construction | |
| CN110685287A (en) | Double-row pile foundation pit supporting system with drainage ditch and retaining wall and construction method | |
| CN114922195A (en) | Construction method of soft soil deep and large foundation pit adjacent to protected object | |
| CN114941333A (en) | Secondary support replacing construction method for deep foundation pit adjacent to subway | |
| CN111236310B (en) | Construction method of connecting channel of existing underground structure in weak water-rich stratum | |
| CN114319437A (en) | Construction method for building retaining wall structure at open-cut storey-adding vertical shaft by subsurface excavation | |
| CN109653193B (en) | Reverse construction method for underground continuous wall | |
| CN110863496B (en) | Method for replacing, supporting, excavating and constructing arch center foundation by concrete supporting in stone-filled island building area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211207 |