CN212001133U - Foundation pit excavation supporting structure - Google Patents
Foundation pit excavation supporting structure Download PDFInfo
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- CN212001133U CN212001133U CN201922401692.1U CN201922401692U CN212001133U CN 212001133 U CN212001133 U CN 212001133U CN 201922401692 U CN201922401692 U CN 201922401692U CN 212001133 U CN212001133 U CN 212001133U
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Abstract
The application provides a excavation supporting construction of foundation ditch belongs to the foundation construction field. The foundation pit comprises a foundation pit body, wherein the foundation pit body is provided with a vertical excavation side and a slope-releasing excavation side which are arranged oppositely; the first fender piles are uniformly arranged on the vertical excavation side at intervals; the first enclosing purlins are fixedly arranged on the first enclosing piles; the second fender piles are arranged on the slope-laying excavation side at intervals, and the height of each second fender pile is smaller than that of each first fender pile; the second enclosing purlins are fixedly arranged on the second enclosing piles; the supporting structures are arranged at intervals, one ends of the supporting structures are connected to the first enclosing purlin, and the other ends of the supporting structures are connected to the second enclosing purlin; the base cushion layer is laid at the bottom of the foundation pit body; utility tunnel body, utility tunnel body are laid on the base cushion layer. The device simple structure, whole atress is reasonable, can practice thrift the cost, and the utility tunnel major structure construction of being convenient for.
Description
Technical Field
The application relates to the field of foundation construction, especially, relate to a foundation ditch excavation supporting construction.
Background
The construction method of the urban comprehensive pipe gallery is not obvious, the construction modes of the current comprehensive pipe gallery mainly comprise an open cut method, a shallow buried underground cut method, a shield method, a pipe jacking method and the like, wherein the most widely applied method is the open cut method. The basic procedures of constructing the comprehensive pipe gallery by adopting the open cut method are as follows: the construction method comprises the steps of constructing a retaining system, excavating a foundation pit and a construction supporting system, excavating earthwork below a support to the bottom of the pit, constructing a main structure of a pipe gallery, dismantling the supporting system and backfilling the foundation pit, wherein the excavation supporting system of the foundation pit is directly related to the construction safety, progress and cost of the comprehensive pipe gallery, so that the reasonable excavation supporting system of the foundation pit is determined to be important for the construction of the comprehensive pipe gallery.
Excavation supporting system of foundation ditch mainly has two kinds: the construction cost of the foundation pit without support for slope excavation is low, the cost is saved, but the occupied area is large; the vertical excavation of the foundation pit for driving the enclosure piles occupies a small area, but is high in manufacturing cost and not beneficial to control cost. Because the utility tunnel belongs to municipal infrastructure, its construction site often receives factors such as engineering geological conditions and urban construction planning land used for planning, consequently need according to the circumstances when designing foundation ditch excavation supporting system, according to the circumstances.
SUMMERY OF THE UTILITY MODEL
One of the purposes of this application lies in providing a excavation supporting construction of foundation ditch, aims at improving the current problem that city utility tunnel construction cost is high.
The technical scheme of the application is as follows:
an excavation supporting structure, comprising:
the foundation pit comprises a foundation pit body, a supporting frame and a supporting frame, wherein the foundation pit body is provided with a vertical excavation side and a slope-releasing excavation side which are arranged oppositely;
a plurality of first guard piles arranged at intervals on the vertical excavation side;
the first enclosing purlins are fixedly arranged on the first enclosing piles;
the second fender piles are arranged on the slope-laying excavation side at intervals, and the height of each second fender pile is smaller than that of each first fender pile;
the second enclosing purlins are fixedly arranged on the second enclosing piles;
the supporting structures are arranged at intervals, one end of each supporting structure is connected to the first enclosing purlin, and the other end of each supporting structure is connected to the second enclosing purlin;
the base cushion layer is paved at the bottom of the foundation pit body;
the utility tunnel body, the utility tunnel body is laid on the basement bed course.
As a technical solution of the present application, the first fender pile and the second fender pile each include a cast-in-situ bored pile.
As a technical scheme of this application, first purlin that encloses with the cross section of second purlin all is right angle trapezoidal form structure.
As a technical scheme of this application, first purlin that encloses with the material of second purlin all includes reinforced concrete.
As a technical scheme of this application, bearing structure includes the steel pipe bracing.
As a technical scheme of this application, bearing structure with first enclosing purlin the second encloses and all connects through loose head between the purlin.
As a technical scheme of this application, put slope excavation side with utility tunnel body junction is provided with the catch basin.
As a technical scheme of the application, the base cushion layer comprises concrete.
The beneficial effect of this application:
in the foundation pit excavation supporting structure, a ground is leveled, and a first fender post and a second fender post are constructed; the second fender post at the side of the foundation pit body for slope excavation is only driven at the position where the steel pipe diagonal brace is arranged, the first fender posts at the side of the foundation pit body for vertical excavation are uniformly constructed according to the design interval, a shallow foundation pit on the ground is excavated, and a water intercepting ditch and a first purlin at the side of vertical excavation are constructed; secondly, putting the slope to excavate the pit bottom of the foundation pit to a secondary slope-putting platform, wherein the pit bottom is in a slope form, and then constructing a base cushion layer made of concrete materials and a second enclosing purlin on one side of the slope-putting excavation; after the integral structural strength meets the design requirement, erecting a steel pipe diagonal brace between the first enclosing purlin and the second enclosing purlin on the two sides by adopting the connection of the flexible joints; and vertically excavating one side of the foundation pit body, and continuously excavating the other side of the foundation pit body along the slope until the designed height of the bottom of the foundation pit body is reached. It should be noted that the first enclosing purlin, the second enclosing purlin and the soil layer below the base cushion layer are not disturbed in the excavation process of the foundation pit body; finally, constructing a pit bottom intercepting ditch and a base cushion layer of the foundation pit body, and sequentially constructing the main body structure of the comprehensive pipe gallery upwards; and after the structure of the comprehensive pipe gallery body reaches the design strength, backfilling to the elevation of the second-level slope-laying platform by adopting undisturbed soil meeting the design requirement, removing the steel pipe inclined strut after compaction and inspection are qualified, continuously backfilling the foundation pit, and recovering the pavement. Therefore, the water and soil pressure outside the foundation pit body acts on the first fender pile on the vertical excavation side, the force of the steel pipe diagonal brace is transmitted to the steel pipe diagonal brace through the first fender purlin on the vertical excavation side, the force of the steel pipe diagonal brace is transmitted to the second fender pile on the slope excavation side through the second fender purlin on the slope excavation side, and soil behind the upper pile on the slope excavation side and soil in front of the lower pile are enabled to be passively pressed. When the structure is applied after meeting the construction site conditions, the purposes of saving cost, reducing the occupation of the construction site, facilitating construction and meeting various requirements of construction can be achieved. In this excavation supporting construction of foundation ditch, one side of foundation ditch body adopts the second grade to put the slope excavation, the another side adopts perpendicular excavation, the scheme that the support form of foundation ditch body adopted "campshed + bearing diagonal", the first fender pile range is evenly laid to the perpendicular excavation side, put slope excavation side and lay the second fender pile range at the interval on the second grade is put the slope platform, the interval of the second fender pile of putting the slope excavation side is the same with the interval of steel pipe bracing, the first purlin that encloses of perpendicular excavation side is connected to the one end of steel pipe bracing, the second on the second grade is put the slope platform is connected to the other end, make overall structure atress even. This structure overall structure is simple, and the atress is reasonable, has row's pile concurrently simultaneously and struts the advantage of excavation perpendicularly and putting the slope, can effectively reduce the occupation space in construction cost and construction site to make things convenient for utility tunnel body structure construction, thereby can improve utility tunnel's efficiency of construction effectively.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural view of a foundation pit excavation supporting structure provided in an embodiment of the present application;
fig. 2 is a schematic view of a first angle structure of a foundation pit excavation supporting structure provided in an embodiment of the present application;
fig. 3 is a schematic view of a second angle structure of the excavation supporting structure provided in the embodiment of the present application.
Icon: 1-excavating a supporting structure of a foundation pit; 2-foundation pit body; 3, vertically excavating a side; 4-slope releasing and side digging; 5-first fender post; 6-a first purlin; 7-second fender post; 8-a second purlin; 9-a support structure; 10-a base cushion layer; 11-a comprehensive pipe rack body; 12-intercepting a ditch; 13-secondary slope-releasing platform.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "upper" and "lower" are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the utility model is used, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the device or element to be referred must have a specific orientation, be constructed in a specific orientation and operation, and thus, should not be construed as limiting the present application.
Further, in the present application, unless expressly stated or limited otherwise, the first feature may be directly contacting the second feature or may be directly contacting the second feature, or the first and second features may be contacted with each other through another feature therebetween, not directly contacting the second feature. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example (b):
referring to fig. 1 and fig. 2 and 3 in a matching manner, the present application provides a foundation pit excavation supporting structure 1, which includes a foundation pit body 2, wherein the foundation pit body 2 has a vertical excavation side 3 and a slope-releasing excavation side 4 which are arranged oppositely; a plurality of first fender posts 5 which are arranged at intervals are fixedly arranged on the vertical excavation side 3 of the foundation pit body 2, and the distance between the first fender posts 5 is determined according to the requirement of actual design; the first enclosing purlins 6 are fixedly arranged on the first enclosing piles 5, and the length directions of the first enclosing purlins are arranged along the arrangement direction of the first enclosing piles 5; a plurality of second fender posts 7 which are arranged at intervals are fixedly arranged on the slope-laying excavation side 4 of the foundation pit body 2, the distance between the second fender posts 7 is determined according to the requirement of actual design, the height of the second fender posts 7 is smaller than that of the first fender posts 5, and meanwhile, the second fender posts 7 are only arranged at the positions where the supporting structures 9 are arranged; the second enclosing purlins 8 are fixedly arranged on the second enclosing piles 7; the second enclosing purlins 8 are fixedly arranged on the second enclosing piles 7, and the length directions of the second enclosing purlins are arranged along the arrangement direction of the second enclosing piles 7; one end of each supporting structure 9 arranged at intervals is connected with the first enclosing purlin 6, the other end of each supporting structure is connected with the second enclosing purlin 8, and the distance between every two supporting structures 9 is determined according to the requirement of actual design; a base cushion layer 10 is laid at the bottom of the foundation pit body 2; the utility tunnel body 11 is installed on the base mat layer 10. Meanwhile, a water intercepting ditch 12 is arranged at the joint of the slope-releasing excavation side 4 and the comprehensive pipe gallery body 11. In addition, a water intercepting ditch 12 can be constructed at the top of the slope-releasing excavation side 4 of the foundation pit body 2, a concrete cushion can be paved at a secondary slope-releasing platform 13, and the slope-releasing position of the secondary platform generally adopts C30 and above concrete and double layers of bidirectional reinforcing bars, so that the concrete cushion is used as strength storage for resisting the pressure of passive soil.
In this embodiment, the first and second fender piles 5 and 7 may be cast-in-situ bored piles.
It should be noted that, in this embodiment, the cross sections of the first enclosing purlin 6 and the second enclosing purlin 8 are both in a right-angled trapezoid structure, and the first enclosing purlin 6 and the second enclosing purlin 8 may be made of reinforced concrete.
It should be noted that, in this embodiment, the supporting structure 9 may be made of a steel pipe diagonal brace to facilitate construction, and if necessary, a prestress needs to be applied to the steel pipe diagonal brace.
In this embodiment, the joints of the supporting structure 9 and the first and second purlins 6 and 8 may be connected by a swivel head.
In this embodiment, the base pad layer 10 may be made of concrete, and the base pad layer 10 is generally made of C20 concrete.
The construction method of the foundation pit excavation supporting structure 1 comprises the following steps:
firstly, leveling the field, and constructing a first fender post 5 and a second fender post 7; wherein, the second fender post 7 at one side of the foundation pit body 2 for slope excavation is only driven at the position for laying the steel pipe diagonal brace, the first fender posts 5 at one side of the foundation pit body 2 for vertical excavation are uniformly constructed according to the design interval, a shallow foundation pit on the ground is excavated, and a water intercepting ditch 12 and a first purlin 6 at one side of the vertical excavation are constructed;
secondly, the slope is set to excavate the pit bottom of the foundation pit to a secondary slope setting platform 13, the pit bottom is preferably in a slope form, and then a base cushion layer 10 made of concrete materials and a second purlin 8 on one side of the slope setting excavation are constructed; after the strength of the integral structure meets the design requirement, erecting steel pipe inclined struts between the first enclosing purlin 6 and the second enclosing purlin 8 on the two sides in a connecting mode of a flexible joint; vertically excavating one side of the foundation pit body 2, and continuously excavating the other side of the foundation pit body by slope excavation until the designed height of the pit bottom of the foundation pit body 2 is reached;
finally, constructing a pit bottom intercepting drain 12 and a base cushion layer 10 of the foundation pit body 2, and sequentially constructing the main body structure of the comprehensive pipe gallery upwards; and after the structure of the comprehensive pipe gallery body 11 reaches the design strength, backfilling to the height of the second-level slope-laying platform 13 by adopting undisturbed soil meeting the design requirement, removing the steel pipe inclined strut after compaction and inspection are qualified, continuously backfilling the foundation pit, and recovering the pavement.
The force transmission path in the foundation pit excavation supporting structure 1 is as follows:
the soil and water pressure in the foundation pit body 2 outside acts on the first fender pile 5 of excavation side 3 perpendicularly, and the first fender purlin 6 of rethread excavation side 3 perpendicularly reaches the steel pipe bracing, and the power of steel pipe bracing reaches the second fender pile 7 of excavation side 4 of putting slope through the second fender purlin 8 of excavation side 4 of putting slope to make soil behind the upper portion stake of excavation side 4 of putting slope and soil before the lower part stake passive compression. When the structure is applied after meeting the construction site conditions, the purposes of saving cost, reducing the occupation of the construction site, facilitating construction and meeting various requirements of construction can be achieved.
To sum up, in the excavation supporting construction 1 of this application, excavation is put to one side adoption second grade of foundation ditch body 2, the another side adopts perpendicular excavation, excavation form adopts the scheme of "campshed + bearing diagonal" of foundation ditch body 2, first fender pile 5 is evenly laid to perpendicular excavation side 3 and is arranged, second fender pile 7 is laid at the interval on second grade slope platform 13 to put slope excavation side 4 and is arranged, the interval of putting second fender pile 7 of slope excavation side 4 is the same with the interval of steel pipe bracing, the first purlin 6 of excavation side 3 is perpendicularly connected to the one end of steel pipe bracing, the second purlin 8 on second grade slope platform 13 is put to the other end connection, make the overall structure atress even. This structure overall structure is simple, and the atress is reasonable, has row's pile concurrently simultaneously and struts the characteristics of excavation perpendicularly and putting the slope, can effectively reduce the occupation space in construction cost and construction site to make things convenient for 11 structure construction of utility tunnel body, thereby can improve utility tunnel's efficiency of construction effectively.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A excavation supporting construction of foundation ditch, its characterized in that includes:
the foundation pit comprises a foundation pit body, a supporting frame and a supporting frame, wherein the foundation pit body is provided with a vertical excavation side and a slope-releasing excavation side which are arranged oppositely;
the first fender piles are uniformly arranged on the vertical excavation side at intervals;
the first enclosing purlins are fixedly arranged on the first enclosing piles;
the second fender piles are arranged on the slope-laying excavation side at intervals, and the height of each second fender pile is smaller than that of each first fender pile;
the second enclosing purlins are fixedly arranged on the second enclosing piles;
the supporting structures are arranged at intervals, one end of each supporting structure is connected to the first enclosing purlin, and the other end of each supporting structure is connected to the second enclosing purlin;
the base cushion layer is paved at the bottom of the foundation pit body;
the utility tunnel body, the utility tunnel body is laid on the basement bed course.
2. The excavation supporting structure of claim 1, wherein the first and second fender piles each comprise a cast-in-situ bored pile.
3. The excavation supporting structure of claim 1, wherein the first purlin and the second purlin each have a right-angled trapezoid-shaped cross section.
4. The excavation supporting structure of claim 1, wherein the first purlin and the second purlin each comprise reinforced concrete.
5. The excavation supporting structure of claim 1, wherein the support structure comprises a steel pipe diagonal brace.
6. The excavation supporting structure of claim 1, wherein the supporting structure is connected with the first enclosing purlin and the second enclosing purlin through loose heads.
7. The excavation supporting structure of claim 1, wherein a cut-off trench is arranged at the joint of the slope-laying excavation side and the comprehensive pipe gallery body.
8. The excavation supporting structure of claim 1, wherein the base pad layer comprises concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922401692.1U CN212001133U (en) | 2019-12-27 | 2019-12-27 | Foundation pit excavation supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922401692.1U CN212001133U (en) | 2019-12-27 | 2019-12-27 | Foundation pit excavation supporting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212001133U true CN212001133U (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922401692.1U Active CN212001133U (en) | 2019-12-27 | 2019-12-27 | Foundation pit excavation supporting structure |
Country Status (1)
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|---|---|
| CN (1) | CN212001133U (en) |
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2019
- 2019-12-27 CN CN201922401692.1U patent/CN212001133U/en active Active
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