CN104372810B - A kind of test unit of simulating pile foundation anti-bending strength - Google Patents
A kind of test unit of simulating pile foundation anti-bending strength Download PDFInfo
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- CN104372810B CN104372810B CN201410751620.9A CN201410751620A CN104372810B CN 104372810 B CN104372810 B CN 104372810B CN 201410751620 A CN201410751620 A CN 201410751620A CN 104372810 B CN104372810 B CN 104372810B
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- platform
- pile foundation
- reaction beam
- test unit
- model casing
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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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- 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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of test unit of simulating pile foundation anti-bending strength, comprise model casing, be arranged on support above model casing and pile foundation moment load loading system, be loaded with foundation soil in model casing, test pile inserts in foundation soil; Pile foundation moment load loading system comprises weighted platform, transmission rod fixed head, dowel bar structure and stake and to bear responsibility platform, weighted platform is connected with the wire rope first upwards extending and then extend horizontally to dowel bar structure upper end, dowel bar structure and stake are born responsibility to be provided with between platform and are executed stressed two force application rods for applying pulling force opposite side to test pile side respectively under the drive of wire rope, the upper end of two force application rods is all rotationally connected with dowel bar structure, and the lower end of two force application rods platform of all bearing responsibility with described stake is fixedly connected with.This test unit can apply Based on Pure Bending Moment load to test pile, can be used for the bearer properties under research stake top Based on Pure Bending Moment effect.
Description
Technical field
The invention belongs to pile foundation test technical field, be specifically related to a kind of test unit of simulating pile foundation anti-bending strength.
Background technology
Pile foundation is in real work, and its top often subjects very complicated load, comprises vertical load, level to load, moment of flexure etc.At present when research Moment is in pile foundation, lack a kind of test unit of practicality, producing moment of flexure in current test often adopts stake top applying eccentric load, but eccentric load is except producing except moment of flexure to stake top, also to stake generation pressure straight down, can cannot study the mechanical characteristic of pile foundation separately under Moment.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, a kind of test unit of simulating pile foundation anti-bending strength is provided.This test unit can apply Based on Pure Bending Moment load to test pile, can be used for the bearer properties under research stake top Based on Pure Bending Moment effect.
For achieving the above object, the technical solution used in the present invention is: a kind of test unit of simulating pile foundation anti-bending strength, it is characterized in that: comprise model casing, be arranged on support above described model casing, and pile foundation moment load loading system, be loaded with foundation soil in described model casing, test pile inserts in described foundation soil, described pile foundation moment load loading system comprises the weighted platform be arranged on outside described model casing, transmission rod fixed head is on the bracket installed, the stake being rotatably connected on dowel bar structure on described transmission rod fixed head and being arranged on described test pile upper end is born responsibility platform, described weighted platform is connected with the wire rope first upwards extending and then extend horizontally to dowel bar structure upper end, described dowel bar structure and stake are born responsibility and to be provided with for applying pulling force opposite side execute stressed two force application rods to stake platform side of bearing responsibility respectively under the drive of wire rope between platform, the upper end of two described force application rods is all rotationally connected with described dowel bar structure, the lower end of two described force application rods platform of all bearing responsibility with described stake is fixedly connected with.
Above-mentioned a kind of test unit of simulating pile foundation anti-bending strength, is characterized in that: described support being provided with the first pulley for the wire rope upwards extended from weighted platform being guided into horizontal-extending, being used for draw from the first pulley and the wire rope of horizontal-extending guides to the second pulley of described dowel bar structure upper end.
Above-mentioned a kind of test unit of simulating pile foundation anti-bending strength, it is characterized in that: described support comprises the support bar of two parallel layings and the first reaction beam of parallel laying and the second reaction beam, described support bar is arranged on the top of model casing, described first reaction beam and the second reaction beam are all arranged on the top of support bar, described first reaction beam and the second reaction beam are all perpendicular with described support bar, described transmission rod fixed head is arranged on a side of described first reaction beam, described support bar stretches out model casing, and the position that described support bar stretches out model casing is provided with Terrace prevention plate, the lower end of described Terrace prevention plate is connected with the U-board for receiving described weighted platform.
Above-mentioned a kind of test unit of simulating pile foundation anti-bending strength, it is characterized in that: described second pulley is arranged on the madial wall of a support bar, the madial wall of described support bar offers the first chute extended along its length, the mount pad of described second pulley is arranged on described support bar by the screw stretching into described first chute.
Above-mentioned a kind of test unit of simulating pile foundation anti-bending strength, it is characterized in that: a side of described first reaction beam offers the second chute extended along the first reaction beam length direction, described transmission rod fixed head is connected with the first reaction beam by the screw stretching into described second chute.
Above-mentioned a kind of test unit of simulating pile foundation anti-bending strength, it is characterized in that: the upper surface of two described support bars all offers the 3rd chute extended along its length, described first reaction beam is connected with described support bar by the screw stretching into described 3rd chute.
Above-mentioned a kind of test unit of simulating pile foundation anti-bending strength, it is characterized in that: described dowel bar structure comprises horizon bar and vertical bar, the lower end of described vertical bar is fixedly mounted on the center of described horizon bar, the center of described horizon bar offers axis hole, is rotatablely equipped with the rotating shaft be fixed on described transmission rod fixed head in described axis hole.
The present invention compared with prior art has the following advantages:
1, the present invention adopts pulley and wire rope to provide moment of flexure to test pile, and structure is simple, rationally novel in design.
2, the present invention is by offering the first chute in support bar side, the second pulley can be made to adjust along support bar axis, the bear responsibility relative position of platform of the second pulley and stake can be made like this to change, be convenient to the position that on adjustment second pulley, wire rope stretches out, enable to apply moment of flexure to test pile accurately.
3, the present invention is by offering the second chute in the first reaction beam side, makes transmission rod fixed head move along the first reaction beam axis and to adjust; Support bar and the first reaction beam connecting part have the 3rd chute, and the first reaction beam can be moved along the axis direction of support bar, are convenient to adjust according to pile anchoring position.
4, the present invention not only can be used for the loading of single pile, is also applicable to the situation that two piles load simultaneously.
In sum, structure of the present invention is simple, and rationally novel in design, functional reliability is high, long service life, and test effect is good, is convenient to promote the use of.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is vertical view of the present invention.
Fig. 2 is the A-A cut-open view in Fig. 1.
Fig. 3 is the B-B cut-open view in Fig. 1.
Fig. 4 is the using state schematic diagram of dowel bar structure of the present invention when not rotating.
Using state schematic diagram when Fig. 5 is dowel bar structure of the present invention rotation.
Fig. 6 is the using state schematic diagram utilizing the present invention simultaneously to load two test piles.
Description of reference numerals:
1-model casing; 2-support; 2-1-the first reaction beam;
2-2-the second reaction beam; 2-3-support bar; 2-4-the 3rd chute;
2-5-the second chute; 2-6-the first chute; 3-transmission rod fixed head;
4-stake is born responsibility platform; 5-test pile; 6-force application rod;
7-rotating shaft; 8-dowel bar structure; 8-1-horizon bar;
8-2-vertically bar; 9-the second pulley; 10-wire rope;
11-the first pulley; 12-Terrace prevention plate; 13-weighted platform;
14-U-board.
Embodiment
A kind of test unit of simulating pile foundation anti-bending strength as shown in Figure 1, Figure 2 and Figure 3, comprise model casing 1, be arranged on support 2 above described model casing 1, and pile foundation moment load loading system, be loaded with foundation soil in described model casing 1, test pile 5 inserts in described foundation soil, described pile foundation moment load loading system comprises the weighted platform 13 be arranged on outside described model casing 1, be arranged on the transmission rod fixed head 3 on described support 2, the stake being rotatably connected on dowel bar structure on described transmission rod fixed head 38 and being arranged on described test pile 5 upper end is born responsibility platform 4, described weighted platform 13 is connected with the wire rope 10 first upwards extending and then extend horizontally to dowel bar structure 8 upper end, described dowel bar structure 8 and stake are born responsibility and to be provided with for applying pulling force opposite side execute stressed two force application rods 6 to stake platform 4 side of bearing responsibility respectively under the drive of wire rope 10 between platform 4, the upper end of two described force application rods 6 is all rotationally connected with described dowel bar structure 8, the lower end of two described force application rods 6 platform 4 of all bearing responsibility with described stake is fixedly connected with.
As shown in Figures 2 and 3, described support 2 being provided with the first pulley 11 for the wire rope upwards extended from weighted platform 13 10 being guided into horizontal-extending, being used for draw from the first pulley 11 and the wire rope 10 of horizontal-extending guides to the second pulley 9 of described dowel bar structure 8 upper end.
As Fig. 1, shown in Fig. 2 and Fig. 3, described support 2 comprises the support bar 2-3 of two parallel layings and the first reaction beam 2-1 of parallel laying and the second reaction beam 2-2, described support bar 2-3 is arranged on the top of model casing 1, described first reaction beam 2-1 and the second reaction beam 2-2 is all arranged on the top of support bar 2-3, described first reaction beam 2-1 and the second reaction beam 2-2 is all perpendicular with described support bar 2-3, described transmission rod fixed head 3 is arranged on a side of described first reaction beam 2-1, described support bar 2-3 stretches out model casing 1, and the position that described support bar 2-3 stretches out model casing 1 is provided with Terrace prevention plate 12, the lower end of described Terrace prevention plate 12 is connected with the U-board 14 for receiving described weighted platform 13.Described support 2 structure is simple, fast easy to assembly.
As shown in Figure 3, described second pulley 9 is arranged on the madial wall of a support bar 2-3, the madial wall of described support bar 2-3 offers the first chute 2-6 extended along its length, the mount pad of described second pulley 9 is arranged on described support bar 2-3 by the screw stretching into described first chute 2-6.
As shown in Figure 2, a side of described first reaction beam 2-1 offers the second chute 2-5 extended along the first reaction beam 2-1 length direction, described transmission rod fixed head 3 is connected with the first reaction beam 2-1 by the screw stretching into described second chute 2-5.
As shown in Figure 1, the upper surface of two described support bar 2-3 all offers the 3rd chute 2-4 extended along its length, and described first reaction beam 2-1 is connected with described support bar 2-3 by the screw stretching into described 3rd chute 2-4.
As shown in Figure 4 and Figure 5, described dowel bar structure 8 comprises horizon bar 8-1 and vertical bar 8-2, the lower end of described vertical bar 8-2 is fixedly mounted on the center of described horizon bar 8-1, the center of described horizon bar 8-1 offers axis hole, is rotatablely equipped with the rotating shaft 7 be fixed on described transmission rod fixed head 3 in described axis hole.
In the present embodiment, dowel bar structure 8, when specifically installing, is arranged in the rotating shaft 7 on transmission rod fixed head 3 by this test unit.During installation, by the axis hole on dowel bar structure 8 horizon bar 8-1 through rotating shaft 7, then rotating shaft 7 is fixed on the bolt hole on transmission rod fixed head 3.Now, dowel bar structure 8 can rotate around rotating shaft 7; Then two force application rods 6 are arranged on respectively the two ends of dowel bar structure 8 horizon bar 8-1, described force application rod 6 passes through pin-hinges with described horizon bar 8-1; Be arranged on bracing frame 2-3 by the first reaction beam 2-1 again, now the first reaction beam 2-1 can move along the 3rd chute 2-4 on bracing frame 2, thus can realize regulating the position of the first reaction beam 2-1; Then be arranged on by transmission rod fixed head 3 on a side of the first reaction beam 2-1, now transmission rod fixed head 3 can move along the second chute 2-5 on the first reaction beam 2-1, thus regulates the position of transmission rod fixed head 3 and dowel bar structure 8; Then support bar 2-3 is arranged on model casing 1, and also fixes according to the position that pile anchoring position adjusts the first reaction beam 2-1 along the 3rd chute 2-4; The position of transmission rod fixed head 3 is adjusted along the second chute 2-5.When force application rod 6 naturally droops the axis of just in time bearing responsibility facing to stake on platform 4, force application rod 6 lower end is fixed on stake and bears responsibility on platform 4, make it not move up and down, then transmission rod fixed head 3 is fixed.The second pulley 9 is arranged on the side of support bar 2-3, now the second pulley 9 can move along the first chute 2-6 again; First pulley 11 is arranged on the lower surface of the second reaction beam 2-2 and the one side be positioned at inside support bar 2-3, the pulley spindle of the first pulley 11 parallels with the axis of the second reaction beam 2-2; Wire rope 10 be each passed through the first pulley 11, second pulley 9 and arrive dowel bar structure 8 upper end and fix, wire rope 10 other end is then fixed on weighted platform 13; Now adjust the position of the second pulley 9, make the axis being parallel of wire rope 10 and the first reaction beam 2-1 stretched out, now wire rope 10 can haul dowel bar structure 87 rotations around the shaft.U-board 14 is fixed on the lower end of Terrace prevention plate 12, makes weighted platform 13 be positioned at the U-lag of described U-board 14, then Terrace prevention plate 12 bolt is connected to the inner side that bracing frame 2-3 stretches out model casing 1 part.
The present embodiment at the trial, weighted platform 13 is placed and loads counterweight, load counterweight and under gravity pulling force is produced to wire rope 10, because wire rope 10 other end is fixed on dowel bar structure 8, direction level, by the transmission of wire rope 10 pairs of pulling force, finally make tension level to haul dowel bar structure 8 around the shaft 7 rotate, dowel bar structure 8 can move with installing force application rod 6 thereunder when rotating, and one of them force application rod 6 can apply the pressure (F namely in Fig. 5 to stake platform 4 side of bearing responsibility
under), another force application rod 6 can apply the pulling force (F namely in Fig. 5 to stake platform 4 opposite side of bearing responsibility
on), described pressure F
underand tensile force f
onsize be equal, such force application rod 6 is just applied with a pair equal and opposite in direction on platform 4 is born responsibility in stake, and the contrary and power that application point is equal with test pile 5 axial line distance in direction, this can produce Based on Pure Bending Moment to test pile 5 to power.Requirement is applied because the rotational angle of dowel bar structure 8 in test can meet pile foundation Based on Pure Bending Moment in very little scope, its angle is usually in the scope being less than 1 °, so dowel bar structure 8 can not cause force inequality maybe cannot exert a force because rotational angle is excessive.
As shown in Figure 6, this test unit not only can be used for the loading of single test pile, is also applicable to the situation that two test piles load simultaneously.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure transformation, all still belong in the protection domain of technical solution of the present invention.
Claims (7)
1. simulate the test unit of pile foundation anti-bending strength for one kind, it is characterized in that: comprise model casing (1), be arranged on the support (2) of described model casing (1) top, and pile foundation moment load loading system, described model casing is loaded with foundation soil in (1), and test pile (5) inserts in described foundation soil, described pile foundation moment load loading system comprises the weighted platform (13) being arranged on described model casing (1) outside, be arranged on the transmission rod fixed head (3) on described support (2), the stake being rotatably connected on the dowel bar structure (8) on described transmission rod fixed head (3) and being arranged on described test pile (5) upper end is born responsibility platform (4), described weighted platform (13) is connected with the wire rope (10) first upwards extending and then extend horizontally to dowel bar structure (8) upper end, described dowel bar structure (8) and stake are born responsibility and to be provided with for applying pulling force opposite side execute stressed two force application rods (6) to stake platform (4) side of bearing responsibility respectively under the drive of wire rope (10) between platform (4), the upper end of two described force application rods (6) is all rotationally connected with described dowel bar structure (8), the lower end of two described force application rods (6) platform (4) of all bearing responsibility with described stake is fixedly connected with.
2. a kind of test unit of simulating pile foundation anti-bending strength according to claim 1, is characterized in that: described support (2) is provided with the first pulley (11) for the wire rope upwards extended from weighted platform (13) (10) being guided into horizontal-extending, for will to draw from the first pulley (11) and the wire rope of horizontal-extending (10) guides to second pulley (9) of described dowel bar structure (8) upper end.
3. a kind of test unit of simulating pile foundation anti-bending strength according to claim 2, it is characterized in that: described support (2) comprises the support bar (2-3) of two parallel layings and first reaction beam (2-1) of parallel laying and the second reaction beam (2-2), described support bar (2-3) is arranged on the top of model casing (1), described first reaction beam (2-1) and the second reaction beam (2-2) are all arranged on the top of support bar (2-3), described first reaction beam (2-1) and the second reaction beam (2-2) are all perpendicular with described support bar (2-3), described transmission rod fixed head (3) is arranged on a side of described first reaction beam (2-1), described support bar (2-3) stretches out model casing (1), and the position that described support bar (2-3) stretches out model casing (1) is provided with Terrace prevention plate (12), the lower end of described Terrace prevention plate (12) is connected with the U-board (14) for receiving described weighted platform (13).
4. a kind of test unit of simulating pile foundation anti-bending strength according to claim 3, it is characterized in that: described second pulley (9) is arranged on the madial wall of a support bar (2-3), the madial wall of described support bar (2-3) offers the first chute (2-6) extended along its length, the mount pad of described second pulley (9) is arranged on described support bar (2-3) by the screw stretching into described first chute (2-6).
5. a kind of test unit of simulating pile foundation anti-bending strength according to claim 3, it is characterized in that: a side of described first reaction beam (2-1) offers the second chute (2-5) extended along the first reaction beam (2-1) length direction, described transmission rod fixed head (3) is connected with the first reaction beam (2-1) by the screw stretching into described second chute (2-5).
6. a kind of test unit of simulating pile foundation anti-bending strength according to claim 3, it is characterized in that: the upper surface of two described support bars (2-3) all offers the 3rd chute (2-4) extended along its length, described first reaction beam (2-1) is connected with described support bar (2-3) by the screw stretching into described 3rd chute (2-4).
7. a kind of test unit of simulating pile foundation anti-bending strength according to claim 1, it is characterized in that: described dowel bar structure (8) comprises horizon bar (8-1) and vertical bar (8-2), the lower end of described vertical bar (8-2) is fixedly mounted on the center of described horizon bar (8-1), the center of described horizon bar (8-1) offers axis hole, is rotatablely equipped with the rotating shaft (7) be fixed on described transmission rod fixed head (3) in described axis hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410751620.9A CN104372810B (en) | 2014-12-09 | 2014-12-09 | A kind of test unit of simulating pile foundation anti-bending strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410751620.9A CN104372810B (en) | 2014-12-09 | 2014-12-09 | A kind of test unit of simulating pile foundation anti-bending strength |
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| Publication Number | Publication Date |
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| CN104372810A CN104372810A (en) | 2015-02-25 |
| CN104372810B true CN104372810B (en) | 2016-04-13 |
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| CN201410751620.9A Expired - Fee Related CN104372810B (en) | 2014-12-09 | 2014-12-09 | A kind of test unit of simulating pile foundation anti-bending strength |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735371B (en) * | 2016-03-04 | 2018-01-02 | 中国电建集团华东勘测设计研究院有限公司 | Frequency conversion horizontal cyclic load testing machine |
| CN109060530B (en) * | 2018-07-25 | 2023-09-08 | 中交第二航务工程局有限公司 | Load plate model test device and method capable of applying pre-compression load in repeated use |
| CN112942452B (en) * | 2021-02-01 | 2022-04-01 | 浙江大学 | Anchor pile multi-position multi-inclination loading device for centrifuge test |
| CN115977174B (en) * | 2023-01-05 | 2023-10-27 | 江苏科技大学 | Multidirectional loading test device and method for foundation model |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5950340A (en) * | 1982-09-14 | 1984-03-23 | Nippon Steel Corp | Inspecting method of bending in longitudinal direction of z-shaped steel sheet pile |
| JPH08219962A (en) * | 1995-02-10 | 1996-08-30 | Mitsubishi Heavy Ind Ltd | Out-of-plane bending tester for piping elbow |
| CN202305346U (en) * | 2011-09-29 | 2012-07-04 | 中国建筑第二工程局有限公司 | Bending resistance test pedestal for prestressed concrete sheet pile |
| CN203083887U (en) * | 2012-08-28 | 2013-07-24 | 常州市建筑科学研究院股份有限公司 | Tube pile anti-bending testing device |
| CN202928901U (en) * | 2012-08-28 | 2013-05-08 | 常州市建筑科学研究院股份有限公司 | Novel bending test device for tubular pile |
| CN103558099B (en) * | 2013-10-22 | 2015-05-13 | 沈阳建筑大学 | Bending torsion test loading device for steel tube concrete pile |
| CN204385783U (en) * | 2014-12-09 | 2015-06-10 | 长安大学 | A kind of experimental rig of simulating pile foundation anti-bending strength |
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2014
- 2014-12-09 CN CN201410751620.9A patent/CN104372810B/en not_active Expired - Fee Related
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