CN111119253A - Simple device for detecting uplift bearing capacity of prefabricated square pile - Google Patents
Simple device for detecting uplift bearing capacity of prefabricated square pile Download PDFInfo
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- CN111119253A CN111119253A CN201911313639.4A CN201911313639A CN111119253A CN 111119253 A CN111119253 A CN 111119253A CN 201911313639 A CN201911313639 A CN 201911313639A CN 111119253 A CN111119253 A CN 111119253A
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- prefabricated square
- square pile
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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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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a simple device for detecting the uplift bearing capacity of a prefabricated square pile. The device comprises a loading device, an anchoring force transmission device, a counterforce system and a displacement measuring device; the loading device is arranged on the anchoring force transmission device, the anchoring force transmission device is arranged on a counterforce system, the counterforce system is arranged on a natural foundation, a displacement measuring device is arranged on the natural foundation, a prefabricated square pile is arranged below the natural foundation, and the surface of the prefabricated square pile is provided with the displacement measuring device which is connected with the anchoring force transmission device; the simple device for detecting the uplift bearing capacity of the prefabricated square pile has strong adaptability to the prefabricated square piles with different steel bar diameters and steel bar intervals, does not incline the steel bars, and ensures the safety and reliability of the test; because each anchoring device is light and convenient, the anchoring device can be installed on site without the cooperation of hoisting equipment.
Description
Technical Field
The invention relates to the technical field of foundation foundations, in particular to a simple device for detecting the uplift bearing capacity of a prefabricated square pile.
Background
The basement is acted on by groundwater and has the possibility of floating upward, often resists buoyancy through setting up prefabricated square pile, needs to carry out on-the-spot single pile resistance to plucking bearing capacity to prefabricated square pile and detect. The invention discloses a device for testing the uplift bearing capacity of a fiber-reinforced micro uplift pile in Chinese patent specification CN107816066A, wherein the upper part of a first steel backing plate is connected with a high-strength nut, the lower end of the first steel backing plate is connected with a load sensor, the lower part of the load sensor is connected with a second steel backing plate, and the bottom of the second steel backing plate is connected with a counter-force beam; jack backing plates are placed on two sides of the pile hole, the bottom of the jack is installed in the center of the jack backing plate, the top of the jack is tightly attached to a third steel backing plate, a beam stool is placed on the jack backing plate, and a hoop rib and a fiber rib in the pile hole are connected to form an uplift pile fiber rib cage; the fiber bar lock head and the fiber bar are anchored on the high-strength drawing screw rod of the expanded head, the displacement sensors are symmetrically arranged on two sides of the pile top of the fiber bar micro uplift pile, and the displacement sensors are fixedly arranged on the reference beam; two ends of the reference beam are respectively supported on the buttresses; the device is simple to install, strong in operability, high in safety and reliability, not easy to damage, reusable, low in cost and capable of obtaining larger pulling-resistant bearing capacity. However, it is known that in the conventional single-pile uplift test, the steel bars of the prefabricated square pile are anchored on the steel plate with the holes formed in advance, and the uplift force is applied to the pile by drawing the steel plate, so that the hole formed in the steel plate of the device needs to be consistent with the position of the steel bars of the pile body, the field adaptability is poor, the steel bars are easy to be inclined, and the detection result is influenced.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide a simple device for detecting the uplift bearing capacity of a prefabricated square pile. It has the characteristics of simple structure, convenient assembly, safe and reliable work and the like. The simple device has strong adaptability to prefabricated square piles with different steel bar diameters and steel bar intervals, does not incline the steel bars, and ensures the safety and reliability of the test; the anchoring device is light and convenient, and can be installed on site without the matching of hoisting equipment.
In order to solve the technical problem, the invention provides a simple device for detecting the uplift bearing capacity of a prefabricated square pile. The device comprises a loading device, an anchoring force transmission device, a counterforce system and a displacement measuring device; the loading device is arranged on the anchoring force transmission device, the anchoring force transmission device is arranged on a counterforce system, the counterforce system is arranged on a natural foundation, a displacement measuring device is arranged on the natural foundation, a prefabricated square pile is arranged below the natural foundation, and the surface of the prefabricated square pile is provided with the displacement measuring device which is connected with the anchoring force transmission device; the loading device comprises one or more jacks; the counterforce system comprises buttresses, backing plates and a foundation, the number of the buttresses and the backing plates is two respectively, the two backing plates are placed on the natural foundation, the buttresses are placed on the two backing plates respectively, force transmission steel beams are placed on the two buttresses, jacks are placed on the force transmission steel beams, round backing plates are placed on the jacks, and the two rectangular anchor beams are horizontally placed on the round backing plates; the anchoring force transfer device comprises two rectangular main beams, two rectangular auxiliary beams, four circular buckles, force transfer steel rods, four rectangular anchor beams and two force transfer steel beams, wherein the two rectangular main beams are arranged, the lower ends of the two force transfer steel beams are provided with the rectangular main beam, the rectangular main beam penetrates through tension steel bars of a prefabricated square pile, the rectangular auxiliary beams penetrating through the tension steel bars are orthogonally arranged on the rectangular main beam, the circular buckles are respectively arranged on the rectangular auxiliary beams, the force transfer steel rods penetrate through the rectangular anchor beams and the rectangular main beams, the upper ends and the lower ends of the force transfer steel rods are screwed through bolts, and therefore the rectangular anchor beams and the rectangular main beams are fixedly connected; the displacement measuring device comprises a displacement meter, two magnetic gauge seats, reference piles and reference beams, wherein the number of the displacement meter, the number of the magnetic gauge seats and the number of the reference piles are four respectively, the reference beams are arranged on a natural foundation and are arranged near the prefabricated square piles, and pile soil is arranged around the reference piles; the method comprises the following steps of connecting a displacement meter with a magnetic meter seat, adsorbing the magnetic meter seat on a reference beam, fixing the two ends of the reference beam on a reference pile in a front-back mode, placing a measuring head of the displacement meter on the surface of a prefabricated square pile, recording relative vertical displacement between the prefabricated square pile and the reference beam, and stopping a test until the prefabricated square pile is pulled up to be damaged or the design requirements are met.
Compared with the prior art, the invention has the following beneficial effects: due to the adoption of the structure, when the device is used, the device is used for measuring the displacement through the loading device, the anchoring force transmission device, the counterforce system and the displacement measuring device; the simple device for detecting the uplift bearing capacity of the prefabricated square pile has strong adaptability to the prefabricated square piles with different steel bar diameters and steel bar intervals, does not incline the steel bars, and ensures the safety and reliability of the test; because each anchoring device is light and convenient, the anchoring device can be installed on site without the cooperation of hoisting equipment.
Drawings
FIG. 1 is a schematic sectional view taken along line a-a of FIG. 2 according to the present invention;
FIG. 2 is a schematic top view of the cross-sectional structure of the present invention;
in the figure: the method comprises the following steps of 1-prefabricated square pile, 2-tension steel bar, 3-rectangular anchor beam, 4-bolt, 5-jack, 6-circular base plate, 7-rectangular main beam, 8-rectangular auxiliary beam, 9-circular buckle, 10-pile soil, 11-displacement meter, 12-magnetic gauge stand, 13-reference beam, 14-force transmission steel rod, 15-buttress, 16-base plate, 17-force transmission steel beam and 18-reference pile.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 and 2 show various cross-sectional structural schematics of the present invention. As shown in fig. 1 and 2, the invention provides a simple device for detecting the uplift bearing capacity of a prefabricated square pile 1. The device comprises a loading device, an anchoring force transmission device, a counterforce system and a displacement measuring device; the loading device is arranged on the anchoring force transmission device, the anchoring force transmission device is arranged on the counterforce system, the counterforce system is arranged on a natural foundation, the natural foundation is provided with a displacement measuring device, a prefabricated square pile 1 is arranged below the natural foundation, a plurality of tension steel bars 2 are arranged in the prefabricated square pile 1, and the number of the tension steel bars 2 is preferably four. The surface of the prefabricated square pile 1 is provided with a displacement measuring device which is connected with an anchoring force transmission device; the loading means comprise one or more jacks 5; the counterforce system comprises buttresses 15, backing plates 16 and a foundation, the number of the buttresses 15 and the backing plates 16 is two respectively, the two backing plates 16 are placed on the natural foundation, the buttresses 15 are placed on the two backing plates 16 respectively, force transmission steel beams 17 are placed on the two buttresses 15, jacks 5 are placed on the force transmission steel beams 17, and the jacks 5 are preferably hydraulic jacks 5; a circular base plate 6 is arranged on the jack 5, and two rectangular anchor beams 3 are horizontally arranged on the circular base plate 6; the anchoring force transfer device comprises rectangular main beams 7, rectangular auxiliary beams 8, circular buckles 9, force transfer steel rods 14, rectangular anchor beams 3 and force transfer steel beams 17, the number of the rectangular main beams 7 is two, the number of the rectangular auxiliary beams 8 is two, the number of the circular buckles 9 is four, the number of the force transfer steel rods 14 is four, the number of the rectangular anchor beams 3 is two, each rectangular anchor beam 3 is provided with two force transfer steel beams 17, the lower ends of the two force transfer steel beams 17 are provided with one rectangular main beam 7, the rectangular main beams 7 penetrate through tension steel bars 2 of a prefabricated square pile 1, the rectangular auxiliary beams 8 penetrating through the tension steel bars 2 are orthogonally arranged on the rectangular main beams 7, the circular buckles are respectively placed on the rectangular auxiliary beams 8, the force transfer steel rods 14 penetrate through the rectangular anchor beams 3 and the rectangular main beams 7, and the upper ends and the lower ends of the force transfer steel rods are screwed through bolts 4, so that the rectangular anchor beams 3 are; the displacement measuring device comprises a displacement meter 11, a magnetic gauge stand 12, a reference pile 18 and a reference beam 13, wherein the number of the displacement meter 11, the number of the magnetic gauge stand 12 and the number of the reference pile 18 are four respectively, the number of the reference beams 13 is two, the reference pile 18 is arranged on a natural foundation and is arranged near a prefabricated square pile 1, soil 10 around the pile is arranged around the reference pile 18, the displacement meter 11 is connected with the magnetic gauge stand 12, the magnetic gauge stand 12 is adsorbed on the reference beam 13, the front end and the rear end of the reference beam 13 are fixed on the reference pile 18, a measuring head of the displacement meter 11 is placed on the surface of the prefabricated square pile 1, the relative vertical displacement between the prefabricated square pile 1 and the reference beam 13 is recorded, and the test is terminated until the prefabricated square pile 1 is pulled up and damaged or meets the design requirements. When in use, the device is used for measuring the displacement through a loading device, an anchoring force transmission device, a counterforce system and a displacement measuring device; the simple device for detecting the uplift bearing capacity of the prefabricated square pile 1 has strong adaptability to the prefabricated square piles 1 with different steel bar diameters and steel bar intervals, does not incline the steel bars, and ensures the safety and reliability of the test; because each anchoring device is light and convenient, the anchoring device can be installed on site without the cooperation of hoisting equipment.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes and modifications can be made within the knowledge of those skilled in the art.
Claims (5)
1. A simple device for detecting the uplift bearing capacity of a prefabricated square pile comprises a loading device, an anchoring force transmission device, a counter-force system and a displacement measuring device; the loading device is arranged on the anchoring force transmission device, the anchoring force transmission device is arranged on a counterforce system, the counterforce system is arranged on a natural foundation, a displacement measuring device is arranged on the natural foundation, a prefabricated square pile (1) is arranged below the natural foundation, and the surface of the prefabricated square pile (1) is provided with the displacement measuring device and is connected with the anchoring force transmission device; the method is characterized in that: the anchoring force transfer device comprises rectangular main beams (7), rectangular auxiliary beams (8), circular buckles (9), force transfer steel rods (14), rectangular anchor beams (3) and force transfer steel beams (17), wherein the number of the rectangular main beams (7) is two, the number of the rectangular auxiliary beams (8) is two, the number of the circular buckles (9) is four, the number of the force transfer steel rods (14) is four, the number of the rectangular anchor beams (3) is two, each rectangular anchor beam (3) is provided with two force transfer steel beams (17), the lower ends of the two force transfer steel beams (17) are provided with one rectangular main beam (7), the rectangular main beams (7) penetrate through tension bars (2) of a prefabricated square pile (1), the rectangular auxiliary beams (8) penetrating through the tension bars (2) are orthogonally arranged on the rectangular main beams (7), the circular buckles are respectively arranged on the rectangular auxiliary beams (8), the force transfer steel rods (14) penetrate through the rectangular anchor beams (3) and the rectangular main beams (7), the upper end and the lower end are screwed through bolts (4), so that the rectangular anchor beam (3) and the rectangular main beam (7) are fixedly connected.
2. The simple device for detecting the uplift bearing capacity of the prefabricated square pile as claimed in claim 1, wherein: the displacement measuring device comprises displacement meters (11), magnetic gauge seats (12), reference piles (18) and reference beams (13), wherein the number of the displacement meters (11), the number of the magnetic gauge seats (12) and the number of the reference piles (18) are four respectively, the number of the reference beams (13) is two, the reference piles (18) are arranged on a natural foundation and are arranged near prefabricated square piles (1), and pile surrounding soil (10) is arranged around the reference piles (18); the displacement meter (11) is connected with the magnetic meter base (12), the magnetic meter base (12) is adsorbed on the reference beam (13), the front end and the rear end of the two ends of the reference beam (13) are fixed on the reference pile (18), and the measuring head of the displacement meter (11) is placed on the surface of the prefabricated square pile (1).
3. The simple device for detecting the uplift bearing capacity of the prefabricated square pile as claimed in claim 1, wherein: the counter-force system includes buttress (15), backing plate (16) and ground, and buttress (15) and backing plate (16) quantity are two respectively, places two backing plates (16) on natural ground, all places a buttress (15) on two backing plates (16), places biography power girder steel (17) on two buttress (15), places jack (5) on biography power girder steel (17), places circular backing plate (6) on jack (5), and two rectangle anchor beam (3) are placed to circular backing plate (6) upper level.
4. The simple device for detecting the uplift bearing capacity of the prefabricated square pile as claimed in claim 3, wherein: the jack (5) is a hydraulic jack.
5. The simple device for detecting the uplift bearing capacity of the prefabricated square pile as claimed in claim 1, wherein: a plurality of tension steel bars are arranged in the prefabricated square pile (1), and the number of the tension steel bars (2) is four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911313639.4A CN111119253A (en) | 2019-12-19 | 2019-12-19 | Simple device for detecting uplift bearing capacity of prefabricated square pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911313639.4A CN111119253A (en) | 2019-12-19 | 2019-12-19 | Simple device for detecting uplift bearing capacity of prefabricated square pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111119253A true CN111119253A (en) | 2020-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911313639.4A Withdrawn CN111119253A (en) | 2019-12-19 | 2019-12-19 | Simple device for detecting uplift bearing capacity of prefabricated square pile |
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| Country | Link |
|---|---|
| CN (1) | CN111119253A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459141A (en) * | 2020-12-01 | 2021-03-09 | 武汉建工集团股份有限公司 | Uplift pile uplift resistance detection method |
| CN113152539A (en) * | 2021-03-31 | 2021-07-23 | 深圳大学 | Assembled foundation pile pulling-resistant static load test device and method |
-
2019
- 2019-12-19 CN CN201911313639.4A patent/CN111119253A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459141A (en) * | 2020-12-01 | 2021-03-09 | 武汉建工集团股份有限公司 | Uplift pile uplift resistance detection method |
| CN113152539A (en) * | 2021-03-31 | 2021-07-23 | 深圳大学 | Assembled foundation pile pulling-resistant static load test device and method |
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Application publication date: 20200508 |
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| WW01 | Invention patent application withdrawn after publication |