CN211172120U - Concrete pile bending test device - Google Patents
Concrete pile bending test device Download PDFInfo
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- CN211172120U CN211172120U CN201921965230.6U CN201921965230U CN211172120U CN 211172120 U CN211172120 U CN 211172120U CN 201921965230 U CN201921965230 U CN 201921965230U CN 211172120 U CN211172120 U CN 211172120U
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- loading
- pile
- load distribution
- bending test
- concrete pile
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Abstract
The utility model discloses a concrete pile bending test device, including loading base and reaction frame and establish the loading hydraulic jack in reaction frame below, still include the load distribution girder steel and establish the percentage table on the loading base, be equipped with a pair of stake tip support frame that is used for supporting stake both ends on the loading base, the load distribution girder steel is established in reaction frame below through the lifting rope, and the middle part of load distribution girder steel is corresponding with loading hydraulic jack's lower extreme. The concrete pile bending resistance test device is reasonable in structural design, the upper and lower test devices of the pile test piece are easy and convenient to operate, the support frame and the loading frame can be replaced to adapt to pile tests of different specifications, the test efficiency is improved, and the test cost is reduced; and load is symmetrically transmitted to the test piece by additionally arranging the load distribution steel beam, so that the accuracy of the test result is effectively improved.
Description
Technical Field
The utility model belongs to the technical field of the concrete pile technique and specifically relates to a concrete pile bending test device is related to.
Background
With the gradual popularization of building industrialization, the precast concrete pile is widely applied to various foundation projects with the advantages of high pile forming quality, high construction speed and good economical efficiency.
The prestressed concrete hollow pile is an improvement of prestressed concrete hollow pipe pile, and adopts centrifugal forming process, most of the performance of the prestressed concrete hollow pile is identical to that of prestressed concrete hollow pipe pile, and under the condition of identical cross-sectional area, the side periphery of the hollow pile is longer than that of the pipe pile, so that the contact area of pile body side surface and soil body is increased, and greater side friction resistance can be obtained, so that the vertical bearing capacity of the pile can be raised in a certain program, therefore said pile type can be used in the engineering in which friction resistance is dominant.
However, the prestressed concrete hollow pile has poor tensile and bending resistance, and the prestressed main reinforcement of the common square tubular pile is basically a prestressed steel bar, but the prestressed steel bar has poor ductility and has the problem of delayed fracture, so that the prestressed steel bar is often fractured in the production process, and the tubular pile also has certain potential safety hazard in the use process; the steel strand has good tensile strength and safety, has reliable bond stress with concrete, and adopts the mature anchoring technology of the clamping piece; the steel strand has relatively higher tensile strength and good tensile ductility, and the steel strand is applied to the prestressed concrete hollow pile, so that the bearing performance of the prestressed concrete hollow pile is improved, the poor tensile and bending resistance is improved, and the defects of the prestressed concrete hollow pile are overcome.
Bending resistance tests are required in the development process of the two types of hollow piles and other types of piles, and the bending resistance is analyzed; at present, a special test device for pile bending resistance test is not provided, both ends of a pile are supported and directly loaded in the middle, the test device is temporarily built, and the operation is complicated; and direct loading, loading can not be even on the stake, the test result accuracy is poor.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model aims to solve the technical problem that a concrete pile bending test device is provided to reach test operation portably, effectively improve the purpose of test result accuracy.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
this concrete pile bending test device, including loading base and reaction frame and establish the loading hydraulic jack in reaction frame below, still include the load distribution girder steel and establish the percentage table on the loading base, be equipped with a pair of stake tip support frame that is used for supporting stake both ends on the loading base, the load distribution girder steel is established in reaction frame below through the lifting rope, and the middle part of load distribution girder steel is corresponding with the lower extreme of loading hydraulic jack.
Furthermore, the top of the pile end supporting frame is an arc-shaped groove matched with the outer edge of the test pile.
And hoisting rings used for being connected with the hoisting ropes are arranged above the two end parts of the load distribution steel beams.
A group of loading frames are arranged below the load distribution steel beams, and arc-shaped grooves matched with the outer edges of the test piles are formed in the lower portions of the loading frames.
The loading base is provided with a track along the width direction of the pile, the track is provided with a slidable sliding seat, and the sliding seat is provided with a lifting support frame for supporting the pile.
The dial indicator is a group and is correspondingly arranged in the middle area of the pile through the support seat support.
The pile end supporting frame is detachably arranged on the loading base through a fastening piece, and the loading frame is detachably arranged below the loading frame.
The two loading frames are symmetrically arranged below two ends of the load distribution steel beam.
The slide bases are a pair of correspondingly arranged slide bases, slide blocks are arranged between the two slide bases, the slide blocks are arranged on the loading base through middle rails, the slide blocks are connected with the slide bases through connecting plates, and the loading base is provided with a driving structure for driving the slide blocks to move.
The load distribution steel beam is an I-shaped steel beam.
Compared with the prior art, the utility model, have following advantage:
the concrete pile bending resistance test device is reasonable in structural design, the upper and lower test devices of the pile test piece are easy and convenient to operate, the support frame and the loading frame can be replaced to adapt to pile tests of different specifications, the test efficiency is improved, and the test cost is reduced; and load is symmetrically transmitted to the test piece by additionally arranging the load distribution steel beam, so that the accuracy of the test result is effectively improved.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
fig. 1 is the structure schematic diagram of the testing device of the present invention.
Fig. 2 is a schematic top view of the loading base of the present invention.
In the figure:
1. the method comprises the steps of loading a base, 2 pile end supporting frames, 3 test piles, 4 dial indicators, 5 strain gauges, 6 load distribution steel beams, 7 loading frames, 8 reaction frames, 9 loading hydraulic jacks, 10 lifting rings, 11 lifting ropes, 12 lifting supporting frames, 13 sliding blocks, 14 connecting plates and 15 rails.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the concrete pile bending test device comprises a loading base 1, a reaction frame 8, a load distribution steel beam 6, a dial indicator 4 arranged on the loading base, and a loading oil jack 9 arranged below the reaction frame; the reaction frame is of a frame structure and is fixed on the loading base.
The loading base is provided with a pair of pile end supporting frames 2 used for supporting two ends of the pile, the load distribution steel beam is arranged below the reaction frame through a lifting rope 11, the reaction frame is provided with a rope winder used for lifting the lifting rope, and the middle part of the load distribution steel beam corresponds to the lower end of the loading hydraulic jack.
The hoisting rings 10 used for being connected with the hoisting ropes are arranged above the two end portions of the load distribution steel beams, the load distribution steel beams are controlled to lift through the rope winder and the two steel ropes, the load distribution steel beams are stably placed above the middle portions of the test piles, and then the load oil jack presses down the middle portions above the load distribution steel beams.
The top of the pile end part supporting frame 2 is an arc-shaped groove matched with the outer edge of the test pile 3, and a pile test piece is reliably positioned and is not easy to slide. Pile tip support frame passes through fastener detachable and establishes on the loading base, through the pile test of the applicable different specifications of change support frame, improves test efficiency, has reduced experimental cost.
A group of loading frames 7 are arranged below the load distribution steel beams, and arc-shaped grooves matched with the outer edges of the test piles are formed in the lower parts of the loading frames; preferably, the number of the loading frames is two, the two loading frames are symmetrically arranged below two ends of the load distribution steel beam, symmetrical loads are transmitted to the test piece through the load distribution steel beam and the two loading frames, and test results are accurate and reliable.
The loading frame is detachably arranged below the loading frame; the loading frame can be fixed through the fastener, can change the adaptation according to the size specification of stake, and the range of application is wide.
The load distribution steel beam is an I-shaped steel beam. The dial indicators are in a group and are correspondingly arranged in the middle area of the pile through the support of the support seat; and a strain gauge 5 is arranged on the surface of the middle area of the tested pile.
A track 15 is arranged on the loading base along the width direction of the pile, a slidable sliding seat is arranged on the track, and a lifting support frame 12 for supporting the pile is arranged on the sliding seat.
The slide bases are a pair of correspondingly arranged slide bases, a slide block 13 is arranged between the two slide bases, the slide block is arranged on a loading base through a middle rail, the slide block and the slide bases are connected through a connecting plate 14, a driving structure for driving the slide block to move is arranged on the loading base, and the driving structure can be a pushing cylinder or a pushing motor. Firstly, the tested pile is hoisted on the lifting support frame, the lifting support frame moves together with the sliding seat to be aligned with the pile end support frame, the lifting support frame drives the tested pile to descend, and the end part of the tested pile falls on the pile end support frame, so that the hoisting operation is facilitated.
Before loading, the test piece is preloaded, the preloading is added to 20% of the estimated limit load, the test piece is loaded to 80% of the design value from zero in a grading mode, then the test piece is continuously loaded to 10% of the design value according to the 10% grade difference, whether the test piece reaches the limit state or not is observed, if the test piece does not reach the limit state, the test piece is continuously loaded in a grading mode according to the 5% grade difference until the test piece reaches the limit state.
And (3) during formal loading, the load applied at each stage is 5% of the predicted limit load, the constant speed is kept during loading, each stage of loading is finished within about 3min, after the reading on the dial indicator is stabilized for 3min, the deflection and strain gauge data displayed on a computer are recorded, and the next stage of loading is carried out after the reading is finished.
With the increase of the load, as long as the pointer of the dial indicator does not have large irregular fluctuation, the dial indicator can be continuously loaded at an original speed until the dial indicator is damaged; if the oil pump is loaded to a certain degree, the reading of the oil pump is greatly adjusted back, the test piece is considered to lose the bearing capacity and be damaged, and the maximum reading reached by the oil pump is the damage load of the test piece.
The pile test piece up-and-down test device is simple and convenient to operate, and can be suitable for pile tests of different specifications by replacing the supporting frame and the loading frame, so that the test efficiency is improved, and the test cost is reduced; and load is symmetrically transmitted to the test piece by additionally arranging the load distribution steel beam, so that the accuracy of the test result is effectively improved.
The above-mentioned is only for the description of the preferred embodiments of the present invention, and the above-mentioned technical features can be combined at will to form a plurality of embodiments of the present invention.
The present invention has been described in detail with reference to the accompanying drawings, and it is apparent that the present invention is not limited by the above embodiments, and various insubstantial improvements can be made without modification to the present invention.
Claims (10)
1. The utility model provides a concrete pile bending test device, includes loading base and reaction frame and establishes the loading hydraulic jack in reaction frame below, its characterized in that: the hydraulic loading device is characterized by further comprising a load distribution steel beam and a dial indicator arranged on the loading base, wherein a pair of pile end supporting frames used for supporting two ends of the pile are arranged on the loading base, the load distribution steel beam is arranged below the reaction frame through a lifting rope, and the middle of the load distribution steel beam corresponds to the lower end of the loading hydraulic jack.
2. The concrete pile bending test apparatus according to claim 1, wherein: the top of the pile end supporting frame is an arc-shaped groove matched with the outer edge of the test pile.
3. The concrete pile bending test apparatus according to claim 1, wherein: and hoisting rings used for being connected with the hoisting ropes are arranged above the two end parts of the load distribution steel beams.
4. The concrete pile bending test apparatus according to claim 1, wherein: a group of loading frames are arranged below the load distribution steel beams, and arc-shaped grooves matched with the outer edges of the test piles are formed in the lower portions of the loading frames.
5. The concrete pile bending test apparatus according to claim 1, wherein: the loading base is provided with a track along the width direction of the pile, the track is provided with a slidable sliding seat, and the sliding seat is provided with a lifting support frame for supporting the pile.
6. The concrete pile bending test apparatus according to claim 1, wherein: the dial indicator is a group and is correspondingly arranged in the middle area of the pile through the support seat support.
7. The concrete pile bending test apparatus of claim 4, wherein: the pile end supporting frame is detachably arranged on the loading base through a fastening piece, and the loading frame is detachably arranged below the loading frame.
8. The concrete pile bending test apparatus of claim 4, wherein: the two loading frames are symmetrically arranged below two ends of the load distribution steel beam.
9. The concrete pile bending test apparatus of claim 5, wherein: the slide bases are a pair of correspondingly arranged slide bases, slide blocks are arranged between the two slide bases, the slide blocks are arranged on the loading base through middle rails, the slide blocks are connected with the slide bases through connecting plates, and the loading base is provided with a driving structure for driving the slide blocks to move.
10. The concrete pile bending test apparatus according to any one of claims 1 to 9, wherein: the load distribution steel beam is an I-shaped steel beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921965230.6U CN211172120U (en) | 2019-11-14 | 2019-11-14 | Concrete pile bending test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921965230.6U CN211172120U (en) | 2019-11-14 | 2019-11-14 | Concrete pile bending test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211172120U true CN211172120U (en) | 2020-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921965230.6U Expired - Fee Related CN211172120U (en) | 2019-11-14 | 2019-11-14 | Concrete pile bending test device |
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| CN (1) | CN211172120U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110714491A (en) * | 2019-11-14 | 2020-01-21 | 马鞍山宏泰建材股份有限公司 | Concrete pile bending test device |
-
2019
- 2019-11-14 CN CN201921965230.6U patent/CN211172120U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110714491A (en) * | 2019-11-14 | 2020-01-21 | 马鞍山宏泰建材股份有限公司 | Concrete pile bending test device |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200804 Termination date: 20211114 |
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| CF01 | Termination of patent right due to non-payment of annual fee |