CN110924455A - Foundation pile detection construction method for existing building - Google Patents
Foundation pile detection construction method for existing building Download PDFInfo
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- CN110924455A CN110924455A CN201911165213.9A CN201911165213A CN110924455A CN 110924455 A CN110924455 A CN 110924455A CN 201911165213 A CN201911165213 A CN 201911165213A CN 110924455 A CN110924455 A CN 110924455A
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- foundation pile
- existing building
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a foundation pile detection construction method of an existing building, which can detect foundation piles of the existing building, erect a temporary steel beam platform to play a temporary supporting role on the periphery of the foundation pile to be detected, recover the original bearing strength of the foundation pile by matching structures such as a fixing piece, a sleeve and the like with concrete pouring after detection is finished, can detect the foundation pile of the existing building buried underground under the condition of not influencing the function of an upper structure, recover the detected foundation pile and maintain the original bearing strength of the foundation pile.
Description
Technical Field
The invention relates to the technical field of foundation pile detection, in particular to a foundation pile detection construction method of an existing building.
Background
The method is one of important ways for realizing sustainable development by reasonably developing and utilizing urban space resources by adding floors or modifying the existing buildings. The existing building is subjected to storey addition or structural reconstruction, and the method mainly aims at the pile foundation which is controlled and designed by adopting the traditional strength theory. The feasibility of adding layers or reconstructing the existing building needs to further know the bearing capacity state of the foundation pile.
The foundation pile of the existing building is affected by geological disasters such as earthquake, debris flow and the like due to early construction, and the state of the pile body is not clear due to load change. In order to identify the safety and quality of an existing building, it is often necessary to perform a status check on its foundation piles.
In the prior art, a reflection wave method is generally adopted for detecting foundation piles of an existing building, but the method only can detect the foundation piles with the pile tops exposed on the ground or above the water surface because a sensor needs to be installed on the pile tops, and cannot detect the foundation piles buried underground of the existing building.
Disclosure of Invention
In view of the above-mentioned shortcomings in the background art, an object of the present invention is to provide a foundation pile detection construction method for an existing building, which can detect a foundation pile of an existing building buried underground, and can recover the detected foundation pile to maintain the original bearing strength of the foundation pile.
In order to realize the purpose, the following technical scheme is adopted:
a foundation pile detection construction method of an existing building comprises the following steps:
s1, excavating a soil body, erecting a temporary steel beam supporting platform around the foundation pile to be detected below the bearing platform, and erecting a support between the temporary steel beam platform and the bearing platform to expose the upper part of the foundation pile to be detected and cut off the foundation pile;
s2, vertically drilling and sampling the top of the truncated lower foundation pile, and installing a sensor at the bottom of the hole to perform excitation detection on the foundation pile;
s3, recovering the truncated foundation pile after detection is completed:
(1) installing a fixing piece in the hole at the top of the lower foundation pile, exposing the upper end of the fixing piece out of the top of the lower foundation pile, and injecting high-strength concrete into the hole;
(2) welding the reserved exposed longitudinal bars, manufacturing a reinforcement cage in the cut-off range of the foundation pile, coating a sleeve outside the reinforcement cage for reinforcement, pouring high-strength concrete into the reinforcement cage, and doping an expanding agent;
and S4, after the concrete to be poured meets the strength requirement, dismantling the temporary steel beam supporting platform and backfilling the soil body.
Further, when the foundation pile is cut in step S1, the concrete of the cut portion of the foundation pile is chiseled and leveled, and the longitudinal ribs inside the foundation pile are exposed and cut.
Further, in the step S2, the drilling depth of the top of the foundation pile is 0.5-2m, and/or the drilling hole diameter is 30-50 mm.
Further, in step S3, the fixing member is shaped like a cross-section, and has a lower end disposed in the hole at the top of the lower foundation pile and an upper end abutting against the bottom of the upper foundation pile.
Further, the upper end of the fixing member is fixedly connected to the bottom of the upper foundation pile by a fastening bolt.
Compared with the prior art, the invention has the following advantages:
the foundation pile detection method can detect the foundation pile of the existing building, erect the temporary steel beam platform to play a temporary supporting role on the periphery of the foundation pile to be detected, and recover the original bearing strength of the foundation pile by matching concrete pouring through structures such as a fixing piece and a sleeve after the detection is finished, so that the detection of the foundation pile of the existing building can be finished under the condition that the function of an upper structure is not influenced; in addition, the fixing pieces are used for connecting the upper foundation pile and the lower foundation pile, so that the axes of the foundation piles are overlapped, the pile center positions and the verticality of the upper foundation pile and the lower foundation pile are kept consistent, and the stability of the restored foundation piles is guaranteed.
Drawings
Fig. 1 is a schematic view of a restoration structure of an existing building after foundation pile detection.
In the figure: a bearing platform-1; an upper foundation pile-2; a lower foundation pile-3; pore-4; a fixing piece-5; a reinforcement cage-6; and (7) pouring concrete.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example 1
A foundation pile detection construction method of an existing building comprises the following steps:
s1, excavating a soil body, erecting a temporary steel beam supporting platform around the foundation pile to be detected below the bearing platform 1, and erecting a support between the temporary steel beam platform and the bearing platform 1 to expose the upper part of the foundation pile to be detected and cut off the foundation pile;
when the foundation pile is cut off in the step, chiseling off the concrete of the cut-off part on the foundation pile and carrying out leveling treatment, and exposing and cutting off the longitudinal ribs in the foundation pile;
s2, vertically drilling and sampling the top of the truncated lower foundation pile 3, and installing a sensor at the bottom of the hole 4 to perform vibration excitation detection on the foundation pile;
in the step, the drilling depth of the top of the foundation pile is 0.5-2m, and the hole diameter of the drilling hole is 30-50 mm;
s3, recovering the truncated foundation pile after detection is completed:
(1) installing a fixing piece 5 in a hole at the top of the lower foundation pile 3, exposing the upper end of the fixing piece 5 out of the top of the lower foundation pile 3, and injecting high-strength concrete into the hole 4;
in this step, said fixing elements 5 are of i-shaped section, with their lower ends placed in holes 4 in the top of lower foundation pile 3 and their upper ends resting against the bottom of upper foundation pile 3.
Wherein, the upper end of the fixing piece 5 is fixedly connected to the bottom of the upper foundation pile 3 through a fastening bolt;
(2) welding the reserved exposed longitudinal bars, manufacturing a reinforcement cage 6 in the truncation range of the foundation pile, coating a sleeve outside the reinforcement cage 6 for reinforcement, pouring high-strength concrete into the reinforcement cage 6, and doping an expanding agent;
and S4, after the concrete to be poured meets the strength requirement, dismantling the temporary steel beam supporting platform and backfilling the soil body.
The sleeve can play the reinforcing effect to concrete placement, and the sleeve can remain or demolish as required after the concrete dries through.
The foundation pile detection method can detect the foundation pile of the existing building, erect the temporary steel beam platform to play a temporary supporting role on the periphery of the foundation pile to be detected, and recover the original bearing strength of the foundation pile by matching concrete pouring through structures such as a fixing piece and a sleeve after the detection is finished, so that the detection of the foundation pile of the existing building can be completed under the condition that the function of an upper structure is not influenced.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A foundation pile detection construction method of an existing building is characterized by comprising the following steps:
s1, excavating a soil body, erecting a temporary steel beam supporting platform around the foundation pile to be detected below the bearing platform, and erecting a support between the temporary steel beam platform and the bearing platform to expose the upper part of the foundation pile to be detected and cut off the foundation pile;
s2, vertically drilling and sampling the top of the truncated lower foundation pile, and installing a sensor at the bottom of the hole to perform excitation detection on the foundation pile;
s3, recovering the truncated foundation pile after detection is completed:
(1) installing a fixing piece in the hole at the top of the lower foundation pile, exposing the upper end of the fixing piece out of the top of the lower foundation pile, and injecting high-strength concrete into the hole;
(2) welding the reserved exposed longitudinal bars, manufacturing a reinforcement cage in the cut-off range of the foundation pile, coating a sleeve outside the reinforcement cage for reinforcement, pouring high-strength concrete into the reinforcement cage, and doping an expanding agent;
and S4, after the concrete to be poured meets the strength requirement, dismantling the temporary steel beam supporting platform and backfilling the soil body.
2. The foundation pile inspection construction method for existing buildings according to claim 1, wherein when the foundation pile is cut off in step S1, concrete of the cut-off portion of the foundation pile is chiseled and leveled, and the longitudinal ribs inside the foundation pile are exposed and cut off.
3. The foundation pile inspection construction method of an existing building according to claim 1, wherein a drilling depth of a top of the foundation pile is 0.5-2m and/or a drilling hole diameter is 30-50mm in the step S2.
4. The method of claim 1, wherein in the step S3, the fixing member has a cross-section of a substantially i-shaped shape, a lower end of the fixing member is placed in the hole of the top of the lower pile, and an upper end of the fixing member abuts against the bottom of the upper pile.
5. The foundation pile inspection construction method of an existing building according to claim 4, wherein the upper end of the fixing member is fixedly connected to the bottom of the upper foundation pile by a fastening bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911165213.9A CN110924455A (en) | 2019-11-25 | 2019-11-25 | Foundation pile detection construction method for existing building |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911165213.9A CN110924455A (en) | 2019-11-25 | 2019-11-25 | Foundation pile detection construction method for existing building |
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| Publication Number | Publication Date |
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| CN110924455A true CN110924455A (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911165213.9A Pending CN110924455A (en) | 2019-11-25 | 2019-11-25 | Foundation pile detection construction method for existing building |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947963A (en) * | 2020-07-07 | 2020-11-17 | 浙江求是工程检测有限公司 | Sampling method for detecting building reinforcing steel bars |
| CN114916465A (en) * | 2022-05-16 | 2022-08-19 | 东联文旅产业发展(江苏)有限公司 | Animal protection net system for ecological tourism |
-
2019
- 2019-11-25 CN CN201911165213.9A patent/CN110924455A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947963A (en) * | 2020-07-07 | 2020-11-17 | 浙江求是工程检测有限公司 | Sampling method for detecting building reinforcing steel bars |
| CN114916465A (en) * | 2022-05-16 | 2022-08-19 | 东联文旅产业发展(江苏)有限公司 | Animal protection net system for ecological tourism |
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Application publication date: 20200327 |
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