CN210712863U - Foundation pit support structure - Google Patents
Foundation pit support structure Download PDFInfo
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- CN210712863U CN210712863U CN201921183200.XU CN201921183200U CN210712863U CN 210712863 U CN210712863 U CN 210712863U CN 201921183200 U CN201921183200 U CN 201921183200U CN 210712863 U CN210712863 U CN 210712863U
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Abstract
The utility model relates to a foundation pit retaining structure, which comprises a foundation pit side retaining structure, wherein the foundation pit side retaining structure comprises a diaphragm wall type retaining wall, a first crown beam is arranged at the top of the retaining wall, a second crown beam is arranged at one side of the first crown beam, which is far away from the foundation pit, and a plurality of prestressed anchor cables are stretched between the first crown beam and the second crown beam; an anchor foundation is constructed in the soil body below the second crown beam, and the anchor foundation and the second crown beam are fixedly connected into a whole; and an operation platform for adjusting the tension of the prestressed anchor cable is formed on the outer side of the second crown beam. The anchoring foundation and the second crown beam are constructed outside the enclosure wall, the prestressed anchor cable is adopted to anchor the enclosure wall, the internal force and deformation of the foundation pit enclosure wall can be well adjusted and controlled by adjusting the tension of the prestressed anchor cable, the problem that the water and soil pressure inside and outside the foundation pit enclosure wall is not easy to balance is solved, and the problems that long-distance anchor cables have large influence on the surrounding urban environment, the cost of an inner support system is high, and the asymmetrical load of the foundation pit cannot be designed are solved.
Description
Technical Field
The utility model relates to a foundation pit retaining structure can be applied to the foundation pit enclosure in fields such as housing construction engineering, underground space development, track traffic engineering.
Background
In various foundation pit designs (building construction engineering, underground space development and rail traffic engineering), common enclosure construction methods are support type (such as inner support type, anchor pull type, double-row piles and the like), soil nail wall, gravity type cement soil wall, slope placing and other enclosure structures. Each enclosing construction method has certain limitations, for example, the inner support type can not be well suitable for a foundation pit with an irregular plane shape (for example, the plane shape of the foundation pit is U-shaped), a large plane area or asymmetric soil pressure of the foundation pit (for example, an unbalance loading foundation pit) and uneconomical inner support construction; the anchor pulls the foundation pit, the anchor rope is longer, if can't retrieve well, will leave many obstacles for the peripheral underground space of foundation pit, unfavorable to the utilization of the peripheral underground space of foundation pit; the double-row pile foundation pit adopts a plane rigid frame model, and the internal force and deformation of the retaining structure cannot be adjusted in time; when the soil nailing wall is used for supporting, when buildings and important underground pipelines exist in the potential sliding surface of the foundation pit, the soil nailing wall is not suitable to be adopted; the slope-making foundation pit requires wide field conditions on site and the like. The traditional enclosure structure system can meet the requirements of economy, safety, convenience in construction and the like, but the foundation pit with asymmetric load, complex and large and irregular surrounding environment is difficult to balance in economy, safety, implementation convenience and influence on the surrounding environment, and the progress and the engineering cost of the engineering are influenced to a certain extent.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a foundation ditch envelope can solve prior art's part defect at least.
The embodiment of the utility model relates to a foundation pit retaining structure, including foundation pit side retaining structure, foundation pit side retaining structure includes diaphragm wall formula enclosure wall, the enclosure wall top is equipped with first crown beam, is executed with the second crown beam in the one side of first crown beam far away from the foundation pit, stretch-draw between first crown beam and the second crown beam has many prestressed anchor cables; an anchor foundation is constructed in the soil body below the second crown beam, and the anchor foundation and the second crown beam are fixedly connected into a whole; and a working platform for adjusting the tension of the prestressed anchor cable is formed on one side of the second crown beam, which is far away from the first crown beam.
In one embodiment, each prestressed anchor cable is horizontally tensioned.
In one embodiment, the prestressed anchorage cables are parallel to each other.
In one embodiment, the prestressed anchor cables are arranged at equal intervals.
In one embodiment, the anchor foundation comprises a plurality of anchor piles which are sequentially constructed at intervals along the length direction of the second crown beam, and the top of each anchor pile is fixedly connected with the second crown beam.
As one embodiment, the enclosure wall is a reinforced concrete wall; the foundation pit side retaining structure further comprises a protective wall, wherein the protective wall is a plain concrete wall and is attached to the outer side wall surface of the enclosure wall.
In one embodiment, the protection wall and the enclosure wall are formed in the same wall slot.
In one embodiment, the anchoring foundation is an underground continuous structure, two ends of the anchoring foundation are respectively connected with the water-stopping wing walls, the water-stopping wing walls extend to be in lap joint with the enclosure wall, and the anchoring foundation and the two water-stopping wing walls form the water-stopping curtain.
In one embodiment, a reinforcing area is defined between the waterproof curtain and the protective wall, and a reinforcing body is applied in the reinforcing area.
As one embodiment, the anchor-pulling foundation is an anchor pile continuous wall or a mixing pile continuous wall or a plain concrete underground continuous wall.
The embodiment of the utility model provides a following beneficial effect has at least:
the utility model provides a foundation ditch retaining structure through executing in the enclosure wall outside and making anchor and draw basis and second guan liang, adopts the prestressed anchorage cable to carry out the anchor to the enclosure wall and draws, can well be to the regulation control of foundation ditch enclosure wall internal force and deformation through prestressed anchorage cable tension force's regulation, solves the difficult balanced problem of outside soil and water pressure in the foundation ditch enclosure wall. The foundation pit support structure overcomes the problems that a long-distance anchor cable has large influence on the surrounding urban environment, the cost of an inner support system is high, an asymmetric load foundation pit cannot be designed and the like, has the advantages of simple design, convenience and quickness in construction, guarantee of structural safety and the like, and has a good application prospect in foundation pit engineering in various fields.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic plan structure view of a foundation pit support structure according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure view of a foundation pit support structure according to an embodiment of the present invention;
fig. 3 is the utility model provides a be applied to subway engineering's foundation ditch envelope's planar structure sketch map that embodiment two provided.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 1 and 2, an embodiment of the present invention provides a foundation pit support structure, including a foundation pit side retaining structure, where the foundation pit side retaining structure includes a diaphragm wall type enclosure wall 1, a first crown beam 2 is disposed on the top of the enclosure wall 1, a second crown beam 3 is disposed on one side of the first crown beam 2, which is away from the foundation pit, and a plurality of prestressed anchor cables 5 are stretched between the first crown beam 2 and the second crown beam 3; an anchor foundation 4 is constructed in the soil body below the second crown beam 3, and the anchor foundation 4 and the second crown beam 3 are fixedly connected into a whole; and a working platform 6 for adjusting the tension of the prestressed anchor cable 5 is formed on one side of the second crown beam 3 far away from the first crown beam 2.
It is understood that the first crown beam 2 is parallel to the second crown beam 3; the two are preferably in the same horizontal plane, namely, each prestressed anchor cable 5 is ensured to be horizontally tensioned, and the adjusting effect on the deformation and the internal force of the foundation pit is better.
In a further preferred structure, as shown in fig. 1, the prestressed anchor cables 5 are parallel to each other, so that the deformation and the internal force of the foundation pit can be uniformly adjusted, and the stress uniformity of each part of the enclosure wall 1 can be improved. It is more preferable to further arrange the prestressed anchorage cables 5 at equal intervals.
The pre-stressed anchor cable 5 is preferably an anchor cable 5 which is not bonded with the soil body; generally, the prestressed anchor rope 5 includes an anchor, a sleeve, and the like in addition to the anchor rope body, and will not be described in detail herein.
As shown in fig. 2, a pavement hardening layer 7 may be further laid above each pre-stressed anchor cable 5 to protect the anchor structure.
Obviously, the anchor foundation 4 and the second top beam 3 above are fixedly connected into a whole, and are stressed together, so that the tensioning effect of each prestressed anchor cable 5 is ensured. In one embodiment, as shown in fig. 1, the anchor foundation 4 comprises a plurality of anchor piles 4 which are sequentially arranged at intervals along the length direction of the second crown beam 3, and the top of each anchor pile 4 is fixedly connected with the second crown beam 3.
The foundation pit retaining structure provided by the embodiment is characterized in that an anchor foundation 4 and a second crown beam 3 are constructed outside the retaining wall 1, the retaining wall 1 is anchored by adopting the prestressed anchor cables 5, the internal force and deformation of the foundation pit retaining wall 1 can be well adjusted and controlled by adjusting the tension of the prestressed anchor cables 5, and the problem that the water and soil pressure inside and outside the foundation pit retaining wall 1 is not easy to balance is solved. The foundation pit support structure overcomes the problems that a long-distance anchor cable 5 has a large influence on the surrounding urban environment, the cost of an inner support system is high, a foundation pit with an asymmetric load cannot be designed and the like, has the advantages of being simple in design, convenient and fast to construct, capable of guaranteeing the safety of the structure and the like, and has a good application prospect in foundation pit engineering in various fields.
The engineering construction process of the above foundation pit support structure is exemplified as follows:
A. constructing a retaining wall 1 and a first crown beam 2, and reserving anchor cable holes on the first crown beam 2;
B. synchronously constructing an anchor foundation 4 and a second crown beam 3, and reserving anchor cable holes on the second crown beam 3; applying an operation platform 6 convenient for tensioning the anchor cable 5;
C. pipe laying, namely, penetrating a prestressed anchor cable 5 into a sleeve, applying certain tension on two ends of the sleeve and laying a pavement hardening layer 7;
D. excavating a foundation pit to a certain depth, performing monitoring measurement, and adjusting the tension of the prestressed anchor cable 5 in real time on the operation platform 6 according to monitoring measurement information to enable the internal force and deformation of the enclosure wall 1 to meet the design requirements of the foundation pit;
E. d, circulating until the foundation pit reaches the design depth;
F. pouring a main structure project until the top plate is finished;
G. backfilling a foundation pit;
H. and (5) releasing and stretching the prestressed anchor cable 5, and recovering.
Example two
The embodiment further optimizes the first embodiment, and the foundation pit support structure is applied to the field of subway engineering and used for supporting the foundation pit of the main body of the station. Specifically, the method comprises the following steps:
the enclosure wall 1 is a reinforced concrete wall, and is used for shield launching or receiving, and when the shield is launched or received, the enclosure wall body in the shield tunnel range needs to be chiseled. In an optimized structure, as shown in fig. 3, the foundation pit side retaining structure further includes a protective wall 8, the protective wall 8 is a plain concrete wall and is attached to the outer wall surface of the enclosure wall 1, and as is easy to understand, the outer wall surface of the enclosure wall 1 is the wall surface of the enclosure wall 1 far away from the foundation pit side.
Based on the structure, in the shield starting or receiving engineering, when the enclosure wall 1 is chiseled, the protection wall 8 can play a role in protection and water stopping, the structural strength and the enclosure effect of the part of the enclosure wall 1 which is not chiseled can be enhanced, engineering accidents such as water leakage, sand leakage and soil body collapse caused by chiseling of the enclosure wall 1 can be avoided, the risk existing in the shield starting or receiving process in the prior art is solved, the construction is convenient and fast, the quality is reliable, safety and economy are realized, and the subway engineering scheme formulation, mature construction, risk control and the like are well realized. The protective wall 8 is a plain concrete wall, so that shield construction is not affected.
Further, the protection wall 8 and the enclosure wall 1 are preferably formed in the same wall groove, specifically, for the integrally formed structure of the protection wall and the enclosure wall, the groove forming thickness of the enclosure wall 1 is increased when the protection wall and the enclosure wall are constructed, the groove forming thickness of the enclosure wall 1 is equal to the sum of the thickness of the enclosure wall 1 and the thickness of the protection wall 8, after the groove forming, a reinforcement cage is placed in the thickness area of the enclosure wall 1, and then concrete is poured into the whole wall groove, so that the integrally formed structure of the enclosure wall 1 and the protection wall 8 is realized, and the construction is convenient.
In a further preferred embodiment, as shown in fig. 3, the above-mentioned foundation pit enclosure structure further comprises a waterproof curtain, which can further protect the enclosure wall 1 and the protection wall 8, and improve the construction safety of shield launching or receiving. In the case where the anchor base 4 is applied as described above, it is preferable to realize the molding of the waterproof curtain based on the anchor base 4, specifically: the anchor is drawn basis 4 and is connected with stagnant water wing wall 9 respectively for underground continuous structure and its both ends, stagnant water wing wall 9 extend to with enclosure wall 1 overlap joint, anchor is drawn basis 4 and two stagnant water wing wall 9 constitutes the stagnant water curtain. Generally, the anchoring base 4 and the two wing walls 9 form a U-shaped waterproof curtain. Wherein, this anchor draws basis 4 can be anchor pile diaphragm wall or mixing pile diaphragm wall or plain concrete underground diaphragm wall, guarantee above-mentioned prestressed anchorage cable 5 stretch-draw effect and guarantee the stagnant water effect of stagnant water curtain can, obviously, this anchor draws basis 4 is plain concrete structure, the shield construction of being convenient for. The water-stop wing wall 9 may be of the same wall structure as the anchor foundation 4, or may be different from the anchor foundation, and is selected according to specific engineering conditions, which will not be described in detail herein.
Furthermore, a reinforcing area is defined between the waterproof curtain and the protective wall 8, and a reinforcing body 10 is applied in the reinforcing area, wherein the reinforcing body 10 is preferably a mixing pile reinforcing body 10.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a foundation pit retaining structure, includes foundation pit side retaining structure, foundation pit side retaining structure includes ground even wall formula enclosure wall, its characterized in that: a first crown beam is arranged at the top of the enclosure wall, a second crown beam is constructed on one side of the first crown beam far away from the foundation pit, and a plurality of prestressed anchor cables are tensioned between the first crown beam and the second crown beam; an anchor foundation is constructed in the soil body below the second crown beam, and the anchor foundation and the second crown beam are fixedly connected into a whole; and a working platform for adjusting the tension of the prestressed anchor cable is formed on one side of the second crown beam, which is far away from the first crown beam.
2. The foundation pit enclosure of claim 1 wherein: and each prestressed anchor cable is horizontally tensioned.
3. A foundation pit envelope as claimed in claim 1 or claim 2 wherein: the prestressed anchor cables are parallel to each other.
4. The foundation pit enclosure of claim 3 wherein: and all the prestressed anchor cables are arranged at equal intervals.
5. The foundation pit enclosure of claim 1 wherein: the anchor-pulling foundation comprises a plurality of anchor piles which are sequentially constructed at intervals along the length direction of the second crown beam, and the top of each anchor pile is fixedly connected with the second crown beam.
6. The foundation pit enclosure of claim 1 wherein: the enclosure wall is a reinforced concrete wall; the foundation pit side retaining structure further comprises a protective wall, wherein the protective wall is a plain concrete wall and is attached to the outer side wall surface of the enclosure wall.
7. The foundation pit enclosure of claim 6 wherein: the protective wall and the enclosure wall are formed in the same wall groove.
8. The foundation pit enclosure of claim 6 wherein: the anchor draws the basis and is underground continuous structure and its both ends are connected with stagnant water wing wall respectively, stagnant water wing wall extend to with enclosure wall overlap joint, the anchor draws the basis and two stagnant water wing wall constitutes the stagnant water curtain.
9. The foundation pit enclosure of claim 8 wherein: and a reinforcing area is formed between the waterproof curtain and the protective wall in an enclosing manner, and a reinforcing body is arranged in the reinforcing area.
10. The foundation pit enclosure of claim 8 wherein: the anchor-pulling foundation is an anchor pile continuous wall or a mixing pile continuous wall or a plain concrete underground continuous wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921183200.XU CN210712863U (en) | 2019-07-25 | 2019-07-25 | Foundation pit support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921183200.XU CN210712863U (en) | 2019-07-25 | 2019-07-25 | Foundation pit support structure |
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| CN210712863U true CN210712863U (en) | 2020-06-09 |
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| CN201921183200.XU Active CN210712863U (en) | 2019-07-25 | 2019-07-25 | Foundation pit support structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113897973A (en) * | 2021-11-02 | 2022-01-07 | 中建八局第四建设有限公司 | Mutual-pulling type foundation pit support structure and construction method |
| CN114164841A (en) * | 2021-12-14 | 2022-03-11 | 深圳中铁二局工程有限公司 | Foundation pit self-stabilizing double-row enclosure and construction method thereof |
| CN115233691A (en) * | 2022-08-04 | 2022-10-25 | 中冶集团武汉勘察研究院有限公司 | Height difference processing supporting structure at basement branch station in soft soil area and construction method thereof |
-
2019
- 2019-07-25 CN CN201921183200.XU patent/CN210712863U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113897973A (en) * | 2021-11-02 | 2022-01-07 | 中建八局第四建设有限公司 | Mutual-pulling type foundation pit support structure and construction method |
| CN114164841A (en) * | 2021-12-14 | 2022-03-11 | 深圳中铁二局工程有限公司 | Foundation pit self-stabilizing double-row enclosure and construction method thereof |
| CN115233691A (en) * | 2022-08-04 | 2022-10-25 | 中冶集团武汉勘察研究院有限公司 | Height difference processing supporting structure at basement branch station in soft soil area and construction method thereof |
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