CN112982444A - Foundation pit support structure and construction method thereof - Google Patents
Foundation pit support structure and construction method thereof Download PDFInfo
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- CN112982444A CN112982444A CN202110487632.5A CN202110487632A CN112982444A CN 112982444 A CN112982444 A CN 112982444A CN 202110487632 A CN202110487632 A CN 202110487632A CN 112982444 A CN112982444 A CN 112982444A
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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
Abstract
The invention provides a foundation pit enclosure structure and a construction method thereof, aiming at enhancing the compression resistance of a foundation pit and ensuring the safety of the foundation pit and surrounding buildings in the construction process of the foundation pit. According to the foundation pit support structure, the long-term enclosure wall, the temporary enclosure wall and the main bottom plate are connected into a whole through the first force transmission structure and the second force transmission structure to form a force transmission structure, so that support is provided for a foundation pit. The downward-turning bracket is arranged in the bottom of the main bottom plate and connected with the temporary enclosure wall, so that the temporary enclosure wall is dismantled to the bottom of a newly-built foundation pit, the force transmission structure can also provide support for the foundation pit under the condition that the counter support cannot be installed, the pressure resistance of the foundation pit is enhanced, and the safety of the foundation pit and surrounding buildings in the foundation pit construction process is guaranteed. In addition, the force transmission section bottom plate arranged between the main bottom plate and the downward turning bracket can ensure that the construction of the main bottom plate and the downward turning bracket cannot be influenced mutually, thereby improving the construction efficiency.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a foundation pit support structure and a construction method thereof.
Background
In order to ensure the safety of the foundation pit and the surrounding buildings, a building enclosure structure, such as a counter support at the top of the foundation pit, is arranged on the foundation pit in the construction process of the foundation pit. The opposite supports are arranged between the enclosure walls on the two sides of the foundation pit, so that the pressure resistance of the enclosure walls can be enhanced, and the foundation pit is prevented from deforming.
However, when the position of the newly-built foundation pit is close to other existing foundation pits, the enclosure wall close to one side of the existing foundation pit in the newly-built foundation pit needs to be removed in the construction process. At this moment, the counter strut can lose the fulcrum, and the counter strut cannot continue to bear the task of preventing the deformation of the foundation pit, so that the hidden danger is brought to the construction of the foundation pit.
Disclosure of Invention
The invention provides a foundation pit enclosure structure and a construction method thereof, aiming at enhancing the compression resistance of a foundation pit and ensuring the safety of the foundation pit and surrounding buildings in the construction process of the foundation pit.
The technical scheme of the foundation pit support structure comprises the following steps:
a foundation pit enclosure structure is applied to a newly-built foundation pit, wherein an existing foundation pit is arranged on one side of the newly-built foundation pit and comprises a long-term enclosure wall arranged on the side part far away from one side of the existing foundation pit in the newly-built foundation pit, a temporary enclosure wall arranged on the side part close to one side of the existing foundation pit in the newly-built foundation pit, a main bottom plate arranged on the bottom of the newly-built foundation pit, a first force transmission structure and a second force transmission structure;
the lower ends of the long-term enclosure wall and the temporary enclosure wall are inserted into the bottom of the newly-built foundation pit; the upper end of the temporary enclosure wall is dismantled to the bottom position of the newly-built foundation pit;
the long-term enclosure wall is connected with the main bottom plate through a force transmission structure I;
the temporary enclosure wall is connected with the main bottom plate through a force transmission structure II;
the force transmission structure II comprises a force transmission section bottom plate arranged on the side portion of the main bottom plate and a downward turning bracket arranged in the bottom of the newly-built foundation pit, the side portion of the force transmission section bottom plate is connected with the side portion of the main bottom plate, the bottom of the force transmission section bottom plate is connected with the upper portion of the downward turning bracket, and the side portion of the downward turning bracket is connected with the temporary enclosure wall.
According to the foundation pit support structure, the long-term enclosure wall, the temporary enclosure wall and the main bottom plate are connected into a whole through the first force transmission structure and the second force transmission structure to form a force transmission structure, so that support is provided for a foundation pit. The downward-turning bracket is arranged in the bottom of the main bottom plate and connected with the temporary enclosure wall, so that the temporary enclosure wall is dismantled to the bottom of a newly-built foundation pit, the force transmission structure can also provide support for the foundation pit under the condition that the counter support cannot be installed, the pressure resistance of the foundation pit is enhanced, and the safety of the foundation pit and surrounding buildings in the foundation pit construction process is guaranteed. In addition, the force transmission section bottom plate arranged between the main bottom plate and the downward turning bracket can ensure that the construction of the main bottom plate and the downward turning bracket cannot be influenced mutually, thereby improving the construction efficiency.
Further, among the foundation ditch enclosure structure, turn over the inside bracket biography power reinforcing bar that sets up of bracket down, bracket biography power reinforcing bar exposes down the reinforcing bar section of turning over the bracket and the contained angle of newly-built foundation ditch bottom be the acute angle, and the directional main bottom plate direction of its tip, turn over the bracket down and pass through bracket biography power reinforcing bar and pass power section bottom plate and be connected. The bracket force transmission steel bar can convert part of bearing force into downward pressure, so that the connection strength of the downward-turning bracket and the bottom of the newly-built foundation pit is increased, the transverse pressure of the downward-turning bracket is reduced, and the pressure resistance of the foundation pit support structure is improved.
Further, among the foundation ditch envelope, in order to increase the stability of biography power structure, interim enclosure wall lateral part sets up interim enclosure wall reinforcing bar, interim enclosure wall reinforcing bar and bracket biography power reinforcing bar are connected.
Further, in the foundation pit enclosure structure, specifically, the force transmission structure comprises an auxiliary bottom plate, and the long-term enclosure wall is connected with the main bottom plate through the auxiliary bottom plate.
Furthermore, in the foundation pit support structure, in order to increase the pressure resistance of the foundation pit support structure and increase the stability of the force transmission structure, the force transmission structure also comprises a throwing support bracket and an inclined throwing support which are fixed on the main bottom plate; one end of the inclined throwing support is connected with the throwing support bracket, and the other end of the inclined throwing support is connected with the upper part of the long-term enclosure wall.
Further, among the foundation ditch retaining structure, the auxiliary bottom plate includes a plurality of auxiliary bottom plate piecemeals, the auxiliary bottom plate piecemeal sets gradually along the bracing projection direction of throwing to one, the first reinforcing layer that still includes anti long-pending, anti long-pending reinforcing layer and auxiliary bottom plate sub-unit connection to set up in newly-built foundation ditch bottom, the auxiliary bottom plate piecemeal is fixed in newly-built foundation ditch bottom through setting up in the engineering stake at its both ends. In some cases where there is a construction time limit, the subfloor cannot be constructed at one time. The auxiliary bottom plate is divided into a plurality of auxiliary bottom plate blocks, so that the construction task can be divided, and the construction of the whole auxiliary bottom plate can be completed step by step within limited time. In the construction of the foundation pit enclosure structure, the inclined throwing support is firstly installed, and then the auxiliary bottom plate blocks are constructed from the position close to the main bottom plate to the direction of the long-term enclosure wall in sequence. The construction is firstly carried out to form the blocks close to the main bottom plate and the auxiliary bottom plate, so that the flatness of the whole bottom of the foundation pit is improved. The anti-swelling reinforcing layer can prevent the lower part of the foundation pit from swelling upwards.
Furthermore, in the foundation pit support structure, the auxiliary bottom plate comprises a plurality of auxiliary bottom plate blocks, the auxiliary bottom plate blocks are sequentially arranged along the vertical direction of the inclined cast strut projection, and the auxiliary bottom plate blocks are fixed at the bottom of a newly-built foundation pit through engineering piles arranged at two ends of the auxiliary bottom plate blocks. In the construction of the foundation pit enclosure structure, firstly, an auxiliary bottom plate is constructed into blocks, two ends of each auxiliary bottom plate block are respectively connected with the long-term enclosure wall and the main bottom plate, then an inclined throwing support above the nth auxiliary bottom plate block is installed, one end of each inclined throwing support is connected with a throwing support bracket, and the other end of each inclined throwing support is connected with the upper part of the long-term enclosure wall. And repeating the steps until the construction of the auxiliary bottom plate is completed and the installation of the inclined throwing support is completed. In the construction process of the foundation pit support structure, the reinforcement cage of the sub-base plate blocks can be installed in a hoisting mode, the installation process cannot be influenced by the inclined cast support, and construction is facilitated.
Furthermore, in the foundation pit enclosure structure, in order to increase the pressure resistance of the foundation pit enclosure structure, the foundation pit enclosure structure further comprises a rear beam plate structure, and the rear beam plate structure is arranged on the upper part of the outer side of the long-term enclosure wall.
Furthermore, in the foundation pit support structure, in order to reduce the influence of vibration on the foundation pit, a flexible damping layer is arranged between the bottom of the newly-built foundation pit and the main bottom plate, the first force transmission structure and the second force transmission structure.
The invention also provides a construction method of the pit enclosure structure, which comprises the following steps:
s1, constructing a newly-built foundation pit on one side of the existing foundation pit, arranging a long-term enclosure wall of the newly-built foundation pit on the side part, far away from the existing foundation pit, of the newly-built foundation pit, and arranging a temporary enclosure wall of the newly-built foundation pit on the side part, near the existing foundation pit, of the newly-built foundation pit;
s2, newly building a foundation pit, and constructing a main bottom plate at the bottom of the newly built foundation pit;
s3, arranging a butt brace between the long-term enclosure wall and the temporary enclosure wall;
s4, constructing a first force transmission structure, and connecting the long-term enclosure wall and the main bottom plate through the first force transmission structure;
s5, constructing a downward turning bracket, constructing a force transmission section bottom plate, and connecting the temporary enclosure wall and the main bottom plate through the downward turning bracket and the force transmission section bottom plate;
s6, after meeting the supporting requirement, dismantling the counter support;
s7, removing the temporary enclosure wall to the bottom of the newly-built foundation pit;
and S8, constructing a post-pouring section bottom plate, and connecting the post-pouring section bottom plate with the existing foundation pit into a whole.
According to the construction method of the foundation pit enclosure structure, the long-term enclosure wall, the temporary enclosure wall and the main bottom plate are connected into a whole through the first force transmission structure and the second force transmission structure to form a force transmission structure, so that support is provided for a foundation pit. The downward-turning bracket is arranged in the bottom of the main bottom plate and connected with the temporary enclosure wall, so that the temporary enclosure wall is dismantled to the bottom of a newly-built foundation pit, the force transmission structure can also provide support for the foundation pit under the condition that the counter support cannot be installed, the pressure resistance of the foundation pit is enhanced, and the safety of the foundation pit and surrounding buildings in the foundation pit construction process is guaranteed. In addition, the force transmission section bottom plate arranged between the main bottom plate and the downward turning bracket can ensure that the construction of the main bottom plate and the downward turning bracket cannot be influenced mutually, thereby improving the construction efficiency.
Further, in the construction method of the foundation pit support structure, the force transmission structure comprises an auxiliary bottom plate, a throwing support bracket, an inclined throwing support and an anti-uplift reinforcing layer; the auxiliary bottom plate comprises a plurality of auxiliary bottom plate blocks;
s4 includes the following steps:
s4-1a, fixing a throwing and supporting bracket on the main bottom plate;
s4-2a, connecting one end of the inclined throwing support with the throwing support bracket, and connecting the other end of the inclined throwing support with the upper part of the long-term enclosure wall;
s4-3a, constructing an anti-uplift reinforcing layer in the bottom of a newly-built foundation pit between the long-term enclosure wall and the main bottom plate;
and S4-4a, sequentially constructing sub-base plate blocks on the anti-swelling reinforcing layer along the projection direction of the inclined cast support, firstly constructing the sub-base plate blocks close to the main base plate, and finally constructing the sub-base plate blocks close to the long-term enclosure wall to form the sub-base plate, wherein the sub-base plate blocks are fixed at the bottom of the newly-built foundation pit through engineering piles arranged at two ends of the sub-base plate blocks.
The auxiliary bottom plate is divided into a plurality of auxiliary bottom plate blocks, so that the construction task can be divided, and the construction of the whole auxiliary bottom plate can be completed step by step within limited time. In the construction of the foundation pit enclosure structure, the inclined throwing support is firstly installed, and then the auxiliary bottom plate blocks are constructed from the position close to the main bottom plate to the direction of the long-term enclosure wall in sequence. The construction is firstly carried out to form the blocks close to the main bottom plate and the auxiliary bottom plate, so that the flatness of the whole bottom of the foundation pit is improved. The anti-swelling reinforcing layer can prevent the lower part of the foundation pit from swelling upwards.
Further, in the construction method of the foundation pit support structure, the force transmission structure comprises an auxiliary bottom plate, a throwing support bracket, an inclined throwing support and an anti-uplift reinforcing layer; the auxiliary bottom plate comprises a plurality of auxiliary bottom plate blocks;
s4 includes the following steps:
s4-1b, fixing a throwing and supporting bracket on the main bottom plate;
s4-2b, constructing an nth sub-base plate block, wherein two ends of the sub-base plate block are respectively connected with the long-term enclosure wall and the main base plate, and the sub-base plate block is fixed at the bottom of the newly-built foundation pit through engineering piles arranged at two ends of the sub-base plate block;
s4-3b, installing an inclined throwing support above the nth sub-base plate block, wherein one end of the inclined throwing support is connected with a throwing support corbel, and the other end of the inclined throwing support is connected with the upper part of the long-term enclosure wall;
and S4-4b, returning to S4-2b, and continuing to construct the (n + 1) th sub-bottom plate block close to the nth sub-bottom plate block until the sub-bottom plate is completely constructed and the inclined throwing support is completely installed.
In the construction process of the foundation pit support structure, the sub-base plate blocks are constructed before the inclined cast support, so that the reinforcement cage of the sub-base plate blocks can be installed in a hoisting mode, the installation process is not affected by the inclined cast support, and construction is facilitated.
Drawings
FIG. 1 is a schematic view of a foundation pit enclosure of the present invention;
FIG. 2 is a schematic view of a down-turned corbel of a foundation pit enclosure of the present invention;
fig. 3 is a schematic view of a first force transfer structure of a foundation pit enclosure of the present invention;
figure 4 is a schematic view of an alternative force transfer structure one of the foundation pit enclosures of the present invention;
fig. 5 is a schematic view of a construction process of a foundation pit support structure of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example 1:
the embodiment provides a technical scheme of a foundation pit support structure as follows:
referring to fig. 1 to 5, a foundation pit enclosure structure is applied to a newly-built foundation pit a, wherein an existing foundation pit b is arranged on one side of the newly-built foundation pit a, and the foundation pit enclosure structure comprises a long-term enclosure wall 1 arranged on the side portion, far away from one side of the existing foundation pit b, of the newly-built foundation pit a, a temporary enclosure wall 2 arranged on the side portion, close to one side of the existing foundation pit b, of the newly-built foundation pit a, a main bottom plate 3 arranged on the bottom of the newly-built foundation pit a, a first force transmission;
the lower ends of the long-term enclosure wall 1 and the temporary enclosure wall 2 are inserted into the bottom of the newly-built foundation pit a; the upper end of the temporary enclosure wall 2 is dismantled to the bottom of the newly-built foundation pit a;
the long-term enclosure wall 1 is connected with the main bottom plate 3 through a force transmission structure I4;
the temporary enclosure wall 2 is connected with the main bottom plate 3 through a force transmission structure II 5;
the second force transmission structure 5 comprises a force transmission section bottom plate 51 arranged on the side of the main bottom plate 3 and a downward turning bracket 52 arranged in the bottom of the newly-built foundation pit a, the side of the force transmission section bottom plate 51 is connected with the side of the main bottom plate 3, the bottom of the force transmission section bottom plate 51 is connected with the upper part of the downward turning bracket 52, and the side of the downward turning bracket 52 is connected with the temporary enclosure wall 2.
According to the foundation pit support structure, the long-term enclosure wall 1, the temporary enclosure wall 2 and the main bottom plate 3 are connected into a whole through the first force transmission structure 4 and the second force transmission structure 5 to form a force transmission structure, so that support is provided for a foundation pit. And turn over bracket 52 down and set up in main bottom plate 3 bottom to be connected with interim enclosure wall 2, demolish to newly-built foundation ditch a bottom position at interim enclosure wall 2 like this, can not install under the c circumstances of propping, the biography power structure also can provide the support for the foundation ditch, has played the compressive capacity of reinforcing foundation ditch, guarantees foundation ditch construction in-process foundation ditch and the effect of building safety on every side. In addition, the force transmission section bottom plate 51 arranged between the main bottom plate 3 and the downward turning bracket 52 can ensure that the construction of the main bottom plate 3 and the downward turning bracket 52 cannot be influenced mutually, thereby improving the construction efficiency.
As a preferred embodiment, in the foundation pit support structure, a bracket force transmission steel bar 521 is arranged inside the downward-turning bracket 52, an included angle between a steel bar section of the downward-turning bracket 52 exposed by the bracket force transmission steel bar 521 and the bottom of the newly-built foundation pit a is an acute angle, the end of the downward-turning bracket 52 points to the main bottom plate 3, and the downward-turning bracket 52 is connected with the force transmission section bottom plate 51 through the bracket force transmission steel bar 521. The bracket force transmission steel bars 521 can convert part of bearing force into downward pressure, so that the connection strength of the downward-turning bracket 52 and the bottom of the newly-built foundation pit a is increased, the transverse pressure of the downward-turning bracket 52 is reduced, and the pressure resistance of the foundation pit support structure is improved.
In a preferred embodiment, in the foundation pit enclosure structure, in order to increase the stability of the force transmission structure, temporary enclosure wall reinforcements 21 are arranged on the side portions of the temporary enclosure wall 2, and the temporary enclosure wall reinforcements 21 are connected with the corbel force transmission reinforcements 521.
In a preferred embodiment, in the foundation pit enclosure structure, specifically, the force transmission structure one 4 includes an auxiliary bottom plate 41, and the long-term enclosure wall 1 is connected with the main bottom plate 3 through the auxiliary bottom plate 41.
In a preferred embodiment, in the foundation pit enclosure structure, in order to increase the pressure resistance of the foundation pit enclosure structure and increase the stability of the force transmission structure, the force transmission structure one 4 further comprises a throwing support bracket 42 and an inclined throwing support 43, which are fixed on the main bottom plate 3; one end of the inclined throwing support 43 is connected with the throwing support corbel 42, and the other end is connected with the upper part of the long-term enclosure wall 1.
In a preferred embodiment, in the foundation pit enclosure structure, the sub-floor 41 includes a plurality of sub-floor blocks 411, the sub-floor blocks 411 are sequentially arranged along the projection direction of the inclined throw support 43, the force transmission structure one 4 further includes an anti-swelling reinforcing layer 44, the anti-swelling reinforcing layer 44 is connected with the lower portion of the sub-floor 41 and is arranged in the bottom of the newly-built foundation pit a, and the sub-floor blocks 411 are fixed at the bottom of the newly-built foundation pit a through engineering piles 7 arranged at two ends of the sub-floor blocks 411. In some cases where there is a construction time limit, the subfloor 41 cannot be completed at one time. The sub-floor 41 is divided into sub-floor segments 411, so that the construction task can be divided, and the construction of the whole sub-floor 41 can be completed step by step within a limited time. In the construction of the foundation pit enclosure structure, the inclined throwing support 43 is firstly installed, and then the auxiliary bottom plate blocks 411 are constructed in sequence from the position close to the main bottom plate 3 to the direction of the long-term enclosure wall 1. The construction of the sub-bottom plate blocks 411 close to the main bottom plate 3 is beneficial to improving the flatness of the whole bottom of the foundation pit. The anti-bulging reinforcing layer 44 prevents the lower portion of the foundation pit from bulging upward.
In a preferred embodiment, in the foundation pit enclosure structure, the sub-floor 41 includes a plurality of sub-floor blocks 411, the sub-floor blocks 411 are sequentially arranged along a vertical direction of a projection of the inclined throw support 43, and the sub-floor blocks 411 are fixed at the bottom of a newly-built foundation pit a through engineering piles 7 arranged at two ends of the sub-floor blocks 411. In the construction of the foundation pit enclosure structure, firstly, an auxiliary bottom plate block 411 is constructed, two ends of the auxiliary bottom plate block 411 are respectively connected with the long-term enclosure wall 1 and the main bottom plate 3, then an inclined throwing support 43 above the nth auxiliary bottom plate block 411 is installed, one end of the inclined throwing support 43 is connected with a throwing support bracket 42, and the other end of the inclined throwing support is connected with the upper part of the long-term enclosure wall 1. And repeating the steps until the construction of the auxiliary bottom plate 41 is completed and the installation of the inclined throwing support 43 is completed. In the construction process of the foundation pit support structure, the reinforcement cage of the sub-base plate block 411 can be installed in a hoisting mode, the installation process cannot be affected by the inclined throwing support 43, and construction is facilitated.
As a preferred embodiment, in order to increase the pressure resistance of the foundation pit enclosure structure, the foundation pit enclosure structure further includes a back-bracing plate structure 6, and the back-bracing plate structure 6 is disposed at the upper portion of the outer side of the long-term enclosure wall 1.
In order to reduce the influence of vibration on the foundation pit, a flexible damping layer 8 is arranged between the bottom of the newly-built foundation pit a and the main bottom plate 3, the first force transmission structure 4 and the second force transmission structure 5.
Example 2:
the embodiment provides a construction method of a pit enclosure structure described in embodiment 1, including the steps of:
s1, constructing a newly-built foundation pit a on one side of the existing foundation pit b, arranging a long-term enclosure wall 1 of the newly-built foundation pit a at the side part of the newly-built foundation pit a far away from the existing foundation pit b, and arranging a temporary enclosure wall 2 of the newly-built foundation pit a at the side part of the newly-built foundation pit a close to the existing foundation pit b;
s2, excavating the newly-built foundation pit a, and constructing a main bottom plate 3 at the bottom of the newly-built foundation pit a;
s3, arranging a counter brace c between the long-term enclosure wall 1 and the temporary enclosure wall 2;
s4, constructing a force transmission structure I4, and connecting the long-term enclosure wall 1 and the main bottom plate 3 through the force transmission structure I4;
s5, constructing a downward-turning bracket 52 and a force transmission section bottom plate 51, and connecting the temporary enclosure wall 2 and the main bottom plate 3 through the downward-turning bracket 52 and the force transmission section bottom plate 51;
s6, after the requirement of supporting is met, the counter stay c is removed;
s7, removing the temporary enclosure wall 2 to the bottom of the newly-built foundation pit a;
and S8, constructing a post-pouring section bottom plate d, and connecting the post-pouring section bottom plate d with the existing foundation pit b into a whole.
According to the construction method of the foundation pit enclosure structure, the long-term enclosure wall 1, the temporary enclosure wall 2 and the main bottom plate 3 are connected into a whole through the first force transmission structure 4 and the second force transmission structure 5 to form a force transmission structure, and support is provided for a foundation pit. And turn over bracket 52 down and set up in main bottom plate 3 bottom to be connected with interim enclosure wall 2, demolish to newly-built foundation ditch a bottom position at interim enclosure wall 2 like this, can not install under the c circumstances of propping, the biography power structure also can provide the support for the foundation ditch, has played the compressive capacity of reinforcing foundation ditch, guarantees foundation ditch construction in-process foundation ditch and the effect of building safety on every side. In addition, the force transmission section bottom plate 51 arranged between the main bottom plate 3 and the downward turning bracket 52 can ensure that the construction of the main bottom plate 3 and the downward turning bracket 52 cannot be influenced mutually, thereby improving the construction efficiency.
In a preferred embodiment, in the construction method of the foundation pit enclosure structure, the force transmission structure one 4 comprises an auxiliary bottom plate 41, a throwing support bracket 42, an inclined throwing support 43 and an anti-ridging reinforcing layer 44; the sub-base plate 41 comprises a plurality of sub-base plate blocks 411;
s4 includes the following steps:
s4-1a, fixing a throwing and supporting bracket 42 on the main bottom plate 3;
s4-2a, connecting one end of the inclined throwing support 43 with the throwing support corbel 42, and connecting the other end of the inclined throwing support 43 with the upper part of the long-term enclosure wall 1;
s4-3a, constructing an anti-uplift reinforcing layer 44 in the bottom of a newly-built foundation pit a between the long-term enclosure wall 1 and the main bottom plate 3;
s4-4a, constructing the sub-bottom plate blocks 411 on the anti-swelling reinforcing layer 44 in sequence along the projection direction of the inclined cast support 43, firstly constructing the sub-bottom plate blocks 411 close to the main bottom plate 3, and finally constructing the sub-bottom plate blocks 411 close to the long-term enclosure wall 1 to form the sub-bottom plate 41, wherein the sub-bottom plate blocks 411 are fixed at the bottom of a newly-built foundation pit a through the engineering piles 7 arranged at two ends of the sub-bottom plate blocks 411.
The sub-floor 41 is divided into sub-floor segments 411, so that the construction task can be divided, and the construction of the whole sub-floor 41 can be completed step by step within a limited time. In the construction of the foundation pit enclosure structure, the inclined throwing support 43 is firstly installed, and then the auxiliary bottom plate blocks 411 are constructed in sequence from the position close to the main bottom plate 3 to the direction of the long-term enclosure wall 1. The construction of the sub-bottom plate blocks 411 close to the main bottom plate 3 is beneficial to improving the flatness of the whole bottom of the foundation pit. The anti-bulging reinforcing layer 44 prevents the lower portion of the foundation pit from bulging upward.
In a preferred embodiment, in the construction method of the foundation pit enclosure structure, the force transmission structure one 4 comprises an auxiliary bottom plate 41, a throwing support bracket 42, an inclined throwing support 43 and an anti-ridging reinforcing layer 44; the sub-base plate 41 comprises a plurality of sub-base plate blocks 411;
s4 includes the following steps:
s4-1b, fixing a throwing and supporting bracket 42 on the main bottom plate 3;
s4-2b, constructing an nth sub-floor block 411, wherein two ends of the sub-floor block 411 are respectively connected with the long-term enclosure wall 1 and the main floor 3, and the sub-floor block 411 is fixed at the bottom of the newly-built foundation pit a through engineering piles 7 arranged at two ends of the sub-floor block 411;
s4-3b, installing the inclined throwing support 43 above the nth sub-bottom plate block 411, wherein one end of the inclined throwing support 43 is connected with the throwing support corbel 42, and the other end of the inclined throwing support 43 is connected with the upper part of the long-term enclosure wall 1;
and S4-4b, returning to S4-2b, and continuing to construct the (n + 1) th sub-floor block 411 adjacent to the nth sub-floor block 411 until the sub-floor 41 is completely constructed and the inclined throwing support 43 is completely installed.
In the construction process of the foundation pit support structure, the auxiliary bottom plate blocks 411 are constructed in advance of the inclined cast supports 43, so that the reinforcement cage of the auxiliary bottom plate blocks 411 can be installed in a hoisting mode, the installation process cannot be influenced by the inclined cast supports 43, and construction is facilitated.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (12)
1. A foundation pit enclosure structure is applied to a newly-built foundation pit (a), and an existing foundation pit (b) is arranged on one side of the newly-built foundation pit (a), and is characterized by comprising a long-term enclosure wall (1) which is arranged in the newly-built foundation pit (a) and is far away from the side part of one side of the existing foundation pit (b), a temporary enclosure wall (2) which is arranged in the newly-built foundation pit (a) and is close to the side part of one side of the existing foundation pit (b), a main bottom plate (3) which is arranged on the bottom of the newly-built foundation pit (a), a force transmission structure I (4;
the lower ends of the long-term enclosure wall (1) and the temporary enclosure wall (2) are inserted into the bottom of the newly-built foundation pit (a); the upper end of the temporary enclosure wall (2) is dismantled to the bottom of the newly-built foundation pit (a);
the long-term enclosure wall (1) is connected with the main bottom plate (3) through a force transmission structure I (4);
the temporary enclosure wall (2) is connected with the main bottom plate (3) through a force transmission structure II (5);
the force transmission structure II (5) comprises a force transmission section bottom plate (51) arranged on the side portion of the main bottom plate (3) and a downward turning bracket (52) arranged in the bottom of the newly-built foundation pit (a), the side portion of the force transmission section bottom plate (51) is connected with the side portion of the main bottom plate (3), the bottom of the force transmission section bottom plate (51) is connected with the upper portion of the downward turning bracket (52), and the side portion of the downward turning bracket (52) is connected with the temporary enclosure wall (2).
2. The foundation pit support structure according to claim 1, wherein the bracket force transmission steel bar (521) is arranged in the downward-turning bracket (52), the angle between the section of the bracket force transmission steel bar (521) exposed out of the downward-turning bracket (52) and the bottom of the newly-built foundation pit (a) is an acute angle, the end part of the section of the bracket force transmission steel bar points to the main bottom plate (3), and the downward-turning bracket (52) is connected with the force transmission section bottom plate (51) through the bracket force transmission steel bar (521).
3. A foundation pit enclosure structure according to claim 2, wherein the side of the temporary enclosure wall (2) is provided with temporary enclosure wall reinforcements (21), and the temporary enclosure wall reinforcements (21) are connected with bracket force transmission reinforcements (521).
4. A foundation pit enclosure according to claim 1 wherein the first force transfer structure (4) comprises a sub-floor (41) and the long term enclosure wall (1) is connected to the main floor (3) by the sub-floor (41).
5. A foundation pit envelope as in claim 4 wherein the force transfer structure one (4) further comprises a throw brace bracket (42) and an inclined throw brace (43) fixed to the main floor (3);
one end of the inclined throwing support (43) is connected with the throwing support bracket (42), and the other end of the inclined throwing support is connected with the upper part of the long-term enclosure wall (1).
6. A foundation pit support structure according to claim 5, characterized in that the sub-floor (41) comprises a plurality of sub-floor blocks (411), the sub-floor blocks (411) are arranged in sequence along the projection direction of the inclined throwing brace (43), the force transfer structure I (4) further comprises an anti-swelling reinforcing layer (44), the anti-swelling reinforcing layer (44) is connected with the lower part of the sub-floor (41) and is arranged in the bottom of the newly-built foundation pit (a), and the sub-floor blocks (411) are fixed at the bottom of the newly-built foundation pit (a) through the engineering piles (7) arranged at two ends of the sub-floor blocks.
7. A foundation pit support structure according to claim 5, characterized in that the sub-floor (41) comprises a plurality of sub-floor blocks (411), the sub-floor blocks (411) are arranged in sequence along the vertical direction of the projection of the inclined throwing support (43), and the sub-floor blocks (411) are fixed at the bottom of the newly-built foundation pit (a) through engineering piles (7) arranged at two ends of the sub-floor blocks.
8. A foundation pit envelope according to claim 1 further comprising a rear tie beam plate structure (6), said rear tie beam plate structure (6) being arranged at an upper portion of the exterior side of the long term enclosure wall (1).
9. A foundation pit envelope structure as claimed in claim 1 wherein a flexible shock absorbing layer (8) is arranged between the bottom of the newly built foundation pit (a) and the main bottom plate (3), the first force transfer structure (4) and the second force transfer structure (5).
10. A method of constructing a foundation pit envelope as claimed in any one of claims 1 to 9, comprising the steps of:
s1, constructing a newly-built foundation pit (a) on one side of an existing foundation pit (b), arranging a long-term enclosure wall (1) of the newly-built foundation pit (a) on the side part, far away from the existing foundation pit (b), of the newly-built foundation pit (a), and arranging a temporary enclosure wall (2) of the newly-built foundation pit (a) on the side part, near the existing foundation pit (b), of the newly-built foundation pit (a);
s2, excavating the newly-built foundation pit (a), and constructing a main bottom plate (3) at the bottom of the newly-built foundation pit (a);
s3, arranging a counter brace (c) between the long-term enclosure wall (1) and the temporary enclosure wall (2);
s4, constructing a first force transmission structure (4), and connecting the long-term enclosure wall (1) and the main bottom plate (3) through the first force transmission structure (4);
s5, constructing a downward turning bracket (52), constructing a force transmission section bottom plate (51), and connecting the temporary enclosure wall (2) and the main bottom plate (3) through the downward turning bracket (52) and the force transmission section bottom plate (51);
s6, after the requirement of supporting is met, the counter stay (c) is removed;
s7, removing the temporary enclosure wall (2) to the bottom of the newly-built foundation pit (a);
and S8, constructing a post-pouring section bottom plate (d), and connecting the post-pouring section bottom plate (d) with the existing foundation pit (b) into a whole.
11. A method of constructing a foundation pit enclosure structure according to claim 10, wherein the first force transfer structure (4) comprises an auxiliary bottom plate (41), a cast brace corbel (42), an inclined cast brace (43) and an anti-ridging reinforcing layer (44); the sub-base plate (41) comprises a plurality of sub-base plate blocks (411);
s4 includes the following steps:
s4-1a, fixing a throwing and supporting bracket (42) on the main bottom plate (3);
s4-2a, connecting one end of an inclined throwing support (43) with a throwing support corbel (42), and connecting the other end of the inclined throwing support with the upper part of the long-term enclosure wall (1);
s4-3a, constructing an anti-uplift reinforcing layer (44) in the bottom of a newly-built foundation pit (a) between the long-term enclosure wall (1) and the main bottom plate (3);
s4-4a, constructing sub-bottom plate blocks (411) on the anti-swelling reinforcing layer (44) in sequence along the projection direction of the inclined throwing support (43), firstly constructing the sub-bottom plate blocks (411) close to the main bottom plate (3), and finally constructing the sub-bottom plate blocks (411) close to the long-term enclosure wall (1) to form sub-bottom plates (41), wherein the sub-bottom plate blocks (411) are fixed at the bottom of a newly-built foundation pit (a) through engineering piles (7) arranged at two ends of the sub-bottom plate blocks.
12. A method of constructing a foundation pit enclosure structure according to claim 10, wherein the first force transfer structure (4) comprises an auxiliary bottom plate (41), a cast brace corbel (42), an inclined cast brace (43) and an anti-ridging reinforcing layer (44); the sub-base plate (41) comprises a plurality of sub-base plate blocks (411);
s4 includes the following steps:
s4-1b, fixing a throwing and supporting bracket (42) on the main bottom plate (3);
s4-2b, constructing an nth sub-bottom plate block (411), wherein two ends of the sub-bottom plate block (411) are respectively connected with the long-term enclosure wall (1) and the main bottom plate (3), and the sub-bottom plate block (411) is fixed at the bottom of the newly-built foundation pit (a) through engineering piles (7) arranged at two ends of the sub-bottom plate block;
s4-3b, installing an inclined throwing support (43) above the nth sub-bottom plate block (411), wherein one end of the inclined throwing support (43) is connected with a throwing support corbel (42), and the other end of the inclined throwing support is connected with the upper part of the long-term enclosure wall (1);
and S4-4b, returning to S4-2b, and continuing to construct the (n + 1) th sub-floor block (411) adjacent to the nth sub-floor block (411) until the sub-floor (41) is completely constructed and the inclined throwing support (43) is completely installed.
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| CN202110487632.5A CN112982444A (en) | 2021-05-06 | 2021-05-06 | Foundation pit support structure and construction method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040011113A (en) * | 2002-07-29 | 2004-02-05 | 김정민 | A method of construction for temporary retaining wall |
| CN104831736A (en) * | 2015-04-15 | 2015-08-12 | 中国建筑第八工程局有限公司 | Support changing method and support changing structure of middle wall of foundation trench |
| CN205242436U (en) * | 2015-08-18 | 2016-05-18 | 上海建工七建集团有限公司 | Supplementary soleplate traded interim bearing structure who props during system was gone along with sb. to guard him to underground complex |
| CN107476313A (en) * | 2017-08-22 | 2017-12-15 | 江苏省岩土工程公司 | A kind of method tiltedly thrown support support system and constructed simultaneously with sole plate |
| CN211080251U (en) * | 2019-11-13 | 2020-07-24 | 上海杰地建筑设计有限公司 | Structure for replacing support by utilizing structural bottom plate when diaphragm wall is used for separating enclosure |
-
2021
- 2021-05-06 CN CN202110487632.5A patent/CN112982444A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040011113A (en) * | 2002-07-29 | 2004-02-05 | 김정민 | A method of construction for temporary retaining wall |
| CN104831736A (en) * | 2015-04-15 | 2015-08-12 | 中国建筑第八工程局有限公司 | Support changing method and support changing structure of middle wall of foundation trench |
| CN205242436U (en) * | 2015-08-18 | 2016-05-18 | 上海建工七建集团有限公司 | Supplementary soleplate traded interim bearing structure who props during system was gone along with sb. to guard him to underground complex |
| CN107476313A (en) * | 2017-08-22 | 2017-12-15 | 江苏省岩土工程公司 | A kind of method tiltedly thrown support support system and constructed simultaneously with sole plate |
| CN211080251U (en) * | 2019-11-13 | 2020-07-24 | 上海杰地建筑设计有限公司 | Structure for replacing support by utilizing structural bottom plate when diaphragm wall is used for separating enclosure |
Non-Patent Citations (4)
| Title |
|---|
| 何国建等: "在运营地铁隧道正上方的深基坑土方开挖施工技术", 《建筑施工》 * |
| 刘爽等: "城市中心复杂环境下深基坑工程施工关键技术研究", 《建筑施工》 * |
| 李伟玲等: "深基坑分隔墙两侧设置下伸牛腿换撑施工技术分析", 《智能城市》 * |
| 赵宝等: "十字交叉型超宽底板后浇带封闭施工技术", 《天津建设科技》 * |
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