CN210140832U - Prestressed occlusion type double-row pile foundation pit supporting structure - Google Patents
Prestressed occlusion type double-row pile foundation pit supporting structure Download PDFInfo
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- CN210140832U CN210140832U CN201920720324.0U CN201920720324U CN210140832U CN 210140832 U CN210140832 U CN 210140832U CN 201920720324 U CN201920720324 U CN 201920720324U CN 210140832 U CN210140832 U CN 210140832U
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Abstract
The utility model provides a prestressing force interlock formula double row pile underground structure belongs to geotechnical engineering underground structure and struts technical field, has solved among the prior art underground structure and has established the problem that the stagnant water curtain leads to the cost height, the construction period long in addition. The double-row pile of the prestressed occlusion type double-row pile foundation pit supporting structure comprises a front row pile and a rear row pile, wherein the front row pile comprises a row pile structure formed by occlusion of a prestressed reinforced concrete cast-in-place pile and a plain concrete cast-in-place pile, and the occlusion part between the adjacent prestressed reinforced concrete cast-in-place pile and the plain concrete cast-in-place pile is more than or equal to 200 mm; and a sleeve is bound on a reinforcement cage of the prestressed reinforced concrete cast-in-place pile and is used for arranging prestressed reinforcements. The interlocking type cast-in-situ bored pile is adopted to replace the traditional discrete double-row pile, the lateral rigidity of the double-row pile is improved, the lateral displacement of the foundation pit enclosure structure is controlled, the safety and the stability of the foundation pit are guaranteed, the construction process is simple, the cross operation with earth excavation is avoided, and the construction period is shortened.
Description
Technical Field
The utility model relates to a geotechnical engineering excavation supporting technical field, concretely relates to prestressing force interlock formula double row pile excavation supporting construction.
Background
With the acceleration of urbanization process and the increasing of development and utilization degree of underground space, the application of row pile supporting structure system is more and more extensive, but with the increasing of surrounding environment of foundation pit (such as existing building, subway tunnel and overhead bridge), in order to ensure the stability of excavation process of foundation pit, the horizontal displacement and settlement of soil body around the foundation pit, building, subway tunnel and overhead bridge are controlled, so that the economic and reasonable foundation pit supporting structure is required to be adopted on the premise of ensuring safety. The conventional row pile supporting method comprises the following steps: (1) and arranging piles and adding an internal support structure system. Namely, a row of reinforced concrete piles are adopted at the periphery of the foundation pit as an enclosure structure, and one or more horizontal supports are arranged at the designed depth to control the lateral displacement of the enclosure structure; (2) and (3) a row pile and prestressed anchor cable structural system. Applying one or more prestressed anchor cables at the design depth of the reinforced concrete pile enclosure structure to limit the lateral displacement of the enclosure structure; (3) double row pile structure system. Two rows of separated reinforced concrete piles are adopted at the periphery of the foundation pit, the front and rear rows of piles are connected through crown beams and connecting beams, and an integral soil retaining structure is formed between the piles and the soil body to limit the lateral displacement of the peripheral soil body.
However, the three row pile supporting methods have certain limitations: the method (1) needs to be used together with the inner support, and brings certain influence on construction cost, construction period, environment and the like of a project; the method (2) has higher requirement on the surrounding environment, the influence of the prestressed anchor cable on underground pipelines, pipelines and the like of adjacent buildings needs to be considered, and the prestressed anchor cable cannot pass through a red line; in the method (3), when the pile is long, the pile body is easy to be pulled to crack, and the durability, the bending resistance and the integral lateral rigidity of the pile body are seriously influenced. And the three pile arrangement supporting methods are additionally provided with waterproof curtains, so that the construction procedures and the construction cost are increased, and the construction period is not easy to control.
Therefore, it is desirable to provide a safe and economical pre-stressed engaged double-row pile foundation pit supporting structure.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information is prior art that is known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prestressing force interlock formula double row pile underground structure can ensure the reliability of envelope, the stability of supporting construction atress and the security of foundation ditch, has solved the problem that prior art cost is high, the period is long again.
In order to realize the purpose, the technical scheme of the utility model is that:
a prestressed occlusion type double-row pile foundation pit supporting structure comprises front row piles and rear row piles, wherein the front row piles comprise row pile structures formed by occlusion of prestressed reinforced concrete cast-in-place piles and plain concrete cast-in-place piles, and the occlusion parts between the adjacent prestressed reinforced concrete cast-in-place piles and the plain concrete cast-in-place piles are larger than or equal to 200 mm; and a sleeve is bound on a reinforcement cage of the prestressed reinforced concrete cast-in-place pile and is used for arranging prestressed reinforcements.
Compared with the prior art, the utility model discloses profitable technological effect lies in:
the utility model provides a prestressing force interlock formula double row pile underground structure, it adopts interlock formula bored concrete pile to replace the double row pile of traditional discrete formula, and it is the interlock formula bored concrete pile that is formed by prestressed reinforced concrete bored concrete pile and plain concrete bored concrete pile. The main advantages are that:
(1) the prestressed tendons are placed in the cast-in-place pile and prestressed, so that the pile body of the cast-in-place pile is prevented from being pulled to crack, the durability of the pile body is improved, the construction process is simple, the construction process does not intersect with the earth excavation, and the construction period is saved;
(2) the lateral rigidity of the double-row piles is improved, the lateral displacement of the foundation pit support structure is more favorably controlled, and the safety and the stability of the foundation pit are ensured;
(3) adverse effects caused by the use of the inner supports and the prestressed anchor cables are avoided, the prestressed tendons can be recycled, and green construction is realized;
(4) the front row of piles are in a meshed cast-in-place pile form, and a waterproof curtain does not need to be additionally arranged for the foundation pit engineering with the water cut requirement, so that the manufacturing cost is effectively reduced, and the construction period is shortened. Further, the length of the plain concrete cast-in-place pile is less than or equal to that of the prestressed reinforced concrete cast-in-place pile. In order to save the manufacturing cost and shorten the construction period, the length of the plain concrete cast-in-place pile can be smaller than that of the prestressed reinforced concrete cast-in-place pile as long as the length meets the requirements of water stop and engagement of not less than 200 mm.
Furthermore, the prestressed tendons penetrate into the sleeve to form a U-shaped structure, and the end parts of the prestressed tendons are anchored on a top ring beam above the pile top of the front row of piles through an anchorage device. The sleeve pipe ligature is on bored concrete pile steel reinforcement cage, at bored concrete pile and bored concrete pile top's capping beam promptly the back of top ring roof beam construction completion, toward the intraductal prestressing tendons that penetrates of sleeve to the prestressing tendons anchor that will keep away from the foundation ditch limit through the ground tackle, the slip casting is treated the slip casting and is reached the design intensity after, carries out stretch-draw application prestressing force to the prestressing tendons that is close to the foundation ditch limit.
Furthermore, the diameter of the plain concrete cast-in-place pile in the front row of piles is consistent with that of the prestressed reinforced concrete cast-in-place pile. Because the plain concrete cast-in-place pile in the front row of piles is only used as a water stop part in the supporting structure, the length and the diameter of the plain concrete cast-in-place pile can be consistent with those of the prestressed reinforced concrete cast-in-place pile. Further, in order to ensure the stress stability of the foundation pit enclosure structure and further ensure the safety of the foundation pit before and after soil excavation, the top ring beam above the pile top of the front row of piles is connected with the top ring beam above the pile top of the rear row of piles through the reinforced concrete connecting beam.
Drawings
Fig. 1 is a schematic longitudinal sectional view of a prestressed interlocking twin-row pile foundation pit supporting structure according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a prestressed interlocking double row pile foundation pit supporting structure according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
fig. 4 is a partially enlarged view of a portion B in fig. 1.
In the figure:
10-front row piles, 11-prestressed reinforced concrete cast-in-place piles, 12-plain concrete cast-in-place piles, 13-sleeves, 14-prestressed reinforcements and 15-grouting layers; 20-rear row piles; 30-top ring beam; 40-an anchor device; and 50-connecting the beam.
Detailed Description
The prestressed interlocking double row pile foundation pit supporting structure provided by the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention. For convenience of description, the directions of "up" and "down" in the following description are the same as the directions of "up" and "down" in the drawings, but this should not be construed as limiting the technical solution of the present invention.
Example one
The structural composition of the prestressed interlocking double row pile foundation pit supporting structure of the present invention will be described in detail with reference to fig. 1 to 4.
A prestressed occlusion type double-row pile foundation pit supporting structure comprises front row piles 10 and rear row piles 20, wherein the front row piles 10 comprise row pile structures formed by occlusion of prestressed reinforced concrete cast-in-place piles 11 and plain concrete cast-in-place piles 12, and the occlusion parts between the adjacent prestressed reinforced concrete cast-in-place piles 11 and the plain concrete cast-in-place piles 12 are larger than or equal to 200 mm; the sleeve 13 is bound on the reinforcement cage of the prestressed reinforced concrete cast-in-place pile and used for arranging prestressed tendons 14.
Particularly, the utility model provides a prestressing force interlock formula double row pile underground structure, it adopts interlock formula bored concrete pile to replace the double row pile of traditional discrete formula, and it is the interlock formula bored concrete pile who is connected the formation by 11 and the 12 interlock of plain concrete bored concrete pile of prestressed reinforcement bored concrete pile. Moreover, the prestressed reinforcement is placed in the prestressed reinforced concrete cast-in-place pile 11 and prestress is applied, so that the phenomenon that the pile body of the prestressed reinforced concrete cast-in-place pile 11 cracks due to tension is avoided, the durability of the pile body is improved, the construction process is simple, the construction process does not intersect with earth excavation, and the construction period is saved. In addition, through the arrangement of the double-row piles in meshed connection, the lateral rigidity of the double-row piles is improved, the lateral displacement of the foundation pit support structure is controlled more favorably, and the safety and the stability of the foundation pit are ensured. Most importantly, the plain concrete cast-in-place piles 12 in the front row of piles 10 can be used as a water-stopping part in a foundation pit supporting structure, and a water-stopping curtain does not need to be additionally arranged for foundation pit engineering with a water-stopping requirement, so that the manufacturing cost is effectively reduced, and the construction period is shortened. Moreover, the adverse effect caused by the use of the inner support and the prestressed anchor rope is avoided, the prestressed tendon 14 can be recycled, and the green construction is realized.
In the present embodiment, it is more preferable that the length of the plain concrete cast-in-place pile 12 is equal to or less than the length of the prestressed reinforced concrete cast-in-place pile 11. Considering that the main function of the plain concrete cast-in-place pile 12 is water stopping to replace the traditional water stopping curtain, in order to save the manufacturing cost and shorten the construction period, as long as the length meets the requirements of water stopping and meshing not less than 200mm, the length of the plain concrete cast-in-place pile 12 can be smaller than that of the prestressed reinforced concrete cast-in-place pile 11.
In this embodiment, it is more preferable that the tendon 14 penetrates into the sleeve 13 to form a U-shaped structure, and the end thereof is anchored to the top ring beam 30 above the pile top of the front row pile 10 by the anchorage device 40. The sleeve 13 is bound on a reinforcement cage of the prestressed reinforced concrete cast-in-place pile 11, after the construction of the prestressed reinforced concrete cast-in-place pile and a capping beam above the prestressed reinforced concrete cast-in-place pile, namely the top ring beam 30, is completed, the prestressed tendons 14 penetrate into the sleeve 13, the prestressed tendons 14 far away from the edge of the foundation pit are anchored through the anchorage device 40, and after grouting reaches design strength, the prestressed tendons 14 close to the edge of the foundation pit are tensioned to apply prestress. And grouting around the prestressed tendons 14 in the casing to form a grouting layer 15.
In the present embodiment, it is more preferable that the diameter of the plain concrete cast-in-place pile 12 in the front row pile 10 is the same as the diameter of the prestressed reinforced concrete cast-in-place pile 11. Because the plain concrete cast-in-place pile 12 in the front row of piles 10 is only used as a water stop part in the foundation pit supporting structure, the length and the diameter of the plain concrete cast-in-place pile 12 can be consistent with those of the prestressed reinforced concrete cast-in-place pile 11.
In this embodiment, more preferably, in order to ensure the stress stability of the foundation pit enclosure structure and thus the safety of the foundation pit before and after the soil excavation, the top ring beam 30 above the pile top of the front row of piles 10 is connected with the top ring beam above the pile top of the rear row of piles through the reinforced concrete connecting beam 50.
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 in any way. Any changes and modifications of the above disclosure by those skilled in the art are within the scope of the appended claims.
Claims (5)
1. A prestressed occlusion type double-row pile foundation pit supporting structure is characterized in that double-row piles comprise front row piles and rear row piles, the front row piles comprise row pile structures formed by occlusion of prestressed reinforced concrete cast-in-place piles and plain concrete cast-in-place piles, and the occlusion parts between the adjacent prestressed reinforced concrete cast-in-place piles and the plain concrete cast-in-place piles are larger than or equal to 200 mm; and a sleeve is bound on a reinforcement cage of the prestressed reinforced concrete cast-in-place pile and is used for arranging prestressed reinforcements.
2. The pre-stressed engagement type double row pile foundation pit supporting structure according to claim 1,
the length of the plain concrete cast-in-place pile is less than or equal to that of the prestressed reinforced concrete cast-in-place pile.
3. The pre-stressed engagement type double row pile foundation pit supporting structure according to claim 1,
the prestressed tendons penetrate into the sleeve to form a U-shaped structure, and the end parts of the prestressed tendons are anchored on a top ring beam above the pile top of the front row of piles through an anchorage device.
4. The pre-stressed engagement type double row pile foundation pit supporting structure according to claim 1,
the diameter of the plain concrete cast-in-place pile in the front row of piles is consistent with that of the prestressed reinforced concrete cast-in-place pile.
5. The pre-stressed engagement type double row pile foundation pit supporting structure according to claim 1,
the top ring beam above the pile top of the front row of piles is connected with the top ring beam above the pile top of the rear row of piles through reinforced concrete connecting beams.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920720324.0U CN210140832U (en) | 2019-05-20 | 2019-05-20 | Prestressed occlusion type double-row pile foundation pit supporting structure |
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| CN201920720324.0U CN210140832U (en) | 2019-05-20 | 2019-05-20 | Prestressed occlusion type double-row pile foundation pit supporting structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113585277A (en) * | 2021-07-08 | 2021-11-02 | 中建一局集团第五建筑有限公司 | Complicated-terrain foundation pit supporting and connecting structure and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113585277A (en) * | 2021-07-08 | 2021-11-02 | 中建一局集团第五建筑有限公司 | Complicated-terrain foundation pit supporting and connecting structure and construction method thereof |
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