CN107966405B - Experimental model structure for binding characteristics of concrete and steel casing - Google Patents
Experimental model structure for binding characteristics of concrete and steel casing Download PDFInfo
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- CN107966405B CN107966405B CN201711416496.0A CN201711416496A CN107966405B CN 107966405 B CN107966405 B CN 107966405B CN 201711416496 A CN201711416496 A CN 201711416496A CN 107966405 B CN107966405 B CN 107966405B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 125
- 239000010959 steel Substances 0.000 title claims abstract description 125
- 239000004567 concrete Substances 0.000 title claims abstract description 91
- 230000003014 reinforcing effect Effects 0.000 claims description 28
- 238000012360 testing method Methods 0.000 claims description 14
- 238000002955 isolation Methods 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 8
- 238000011160 research Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention discloses an experimental model structure for bonding characteristics of concrete and a steel pile casing, which comprises the steel pile casing and a loading module, wherein concrete is respectively poured inside and outside the steel pile casing, the loading module is connected with the steel pile casing, the loading module provides a force for stretching the steel pile casing to separate the steel pile casing from the concrete, and both ends of the steel pile casing are positioned outside the concrete. The invention has the advantages that: through exerting force to the loading post, after last transmitting to the steel pile casing, make the steel pile casing be tensile state rather than pressurized state, avoided the too big steel pile casing that leads to of pressure takes place to warp and lead to the inaccurate data. The purpose of the two ends of the steel casing being located outside the concrete is to prevent the adhesive surface from changing after the relative displacement between the steel casing and the concrete.
Description
Technical Field
The invention relates to the field of building experimental models, in particular to an experimental model structure for the bonding characteristics of concrete and a steel casing.
Background
In the structural design of the deepwater cofferdam, the larger the binding force between the concrete and the steel casing is, the smaller the required concrete thickness is, so that the structures such as the inner support of the cofferdam can be correspondingly reduced. Therefore, the bond stress between the concrete and the steel casing has a great impact on the design of the entire cofferdam.
At present, the bonding stress between the concrete of the bearing platform back cover and the steel pile casing is valued by adopting traditional experience data. The research on the problems at home and abroad is very few, the difference of test results of research in each unit is large, the test data is also small, the value is not unified, the universality is poor, and the design and construction of various deep water foundation back cover concretes are not sufficiently guided. At present, the special research on the bonding strength of the steel pile casing and the back cover concrete is less, and the research results on the bonding strength of the concrete in the steel pile casing and the steel pile casing are more, but the experimental research results only consider the bonding strength of the concrete when the concrete is pushed out of the steel pile casing, and the interaction state between the back cover concrete in the cofferdam foundation and the steel pile casing is different. The tests which are specially carried out on the bonding strength of the steel pile casing and the concrete of the back cover are also insufficient, for example, the test structure is complex or huge and is unfavorable for indoor development, and the number of samples with different sizes is insufficient due to the complex test structure, so that the test conclusion is influenced; or the test results are insufficient, only the influence of the concrete strength or the ratio of the diameter of the steel casing to the thickness of the concrete on the bonding coefficient is studied, and no systematic summary is made on the independent influence coefficient of the diameter of the steel casing and the thickness of the concrete.
Disclosure of Invention
The invention aims to solve the problem of the bond strength between concrete and a steel casing, and provides an experimental model structure related to the bond characteristic of the concrete and the steel casing.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The utility model provides an experimental model structure about concrete and steel pile casing bonding characteristic, includes steel pile casing, loading module, the inside and outside concrete of pouring respectively of steel pile casing, loading module is connected with steel pile casing, loading module provides the tensile steel pile casing and makes the steel pile casing break away from the power of concrete, both ends of steel pile casing all are located the concrete outside.
Preferably, the loading module comprises a beam and a loading column, a hole is formed in the steel casing, the beam penetrates through the hole in the steel casing to be fixed on the steel casing, and one end of the loading column is connected with the beam.
The concrete pile casting device is characterized by further comprising a reinforcing plate, wherein the horizontal height of the cross beam on the steel pile casing is lower than that of the lower surface of the concrete, a through hole for the steel pile casing to pass through is formed in the reinforcing plate, the reinforcing plate is arranged below the concrete outside the steel pile casing, the horizontal height of the lower surface of the reinforcing plate is greater than that of the cross beam, and the steel pile casing is downward separated from the concrete during a test.
The concrete pile is characterized by further comprising a reinforcing plate, wherein the horizontal height of the cross beam is higher than that of concrete, a through hole for the steel pile casing to pass through is formed in the reinforcing plate, the reinforcing plate is arranged above the concrete outside the steel pile casing, the horizontal height of the upper surface of the reinforcing plate is lower than that of the cross beam, and the steel pile casing is separated from the concrete upwards during a test.
Preferably, the loading column is one, and the central axis in the length direction of the loading column coincides with the central axis in the length direction of the steel casing.
Preferably, the center of the cross beam is welded to the load post, the cross beam includes at least 2 horizontal cross bars extending from the center of the cross beam to the outside of the holes in the steel casing, the horizontal cross bars being disposed about the center array of the cross beam.
Preferably, the cross beams are 2 horizontal cross beams in the same straight line direction.
Preferably, an isolation structure is arranged at the contact position of the loading module and the concrete.
Preferably, the upper surface of the reinforcing plate is provided with a die structure for pouring concrete.
Optimally, a supporting structure is arranged below the reinforcing plate, and a gap is arranged on the supporting structure below the cross beam; the upper surface of the reinforcing plate is provided with a pressurizing part.
The invention has the advantages that:
(1) According to the invention, the loading column is applied with force, and the steel casing is in a stretched state instead of a pressed state after being finally transferred to the steel casing, so that inaccurate data caused by deformation of the steel casing due to overlarge pressure is avoided compared with the condition that the steel casing model is directly applied with pressure. The purpose of the two ends of the steel casing being located outside the concrete is to prevent the adhesive surface from changing after the relative displacement between the steel casing and the concrete.
(2) The beam is arranged below the concrete, the steel casing is stretched downwards by applying pressure to the beam, and the beam is arranged above the concrete, and the steel casing is stretched upwards by applying tension to the beam and finally transmitting the tension to the steel casing. Both the two modes ensure that the steel casing is in a stretching state.
(3) The reinforcing plate is arranged in the invention, so that the concrete is uniformly stressed, the deformation of the concrete is prevented from influencing the value of the measured bonding strength, and the test error is reduced.
(4) When the crossbeam is the first setting mode, the setting of loading post quantity and position can reduce the quantity of loading post, has also reduced the bonding between loading post and the concrete and has produced the influence to experimental data.
(5) The setting of crossbeam structure can make the power transmission that receives on the loading post to steel pile casing on, and many horizontal crossbars set up with the mode of central array, can make steel pile casing atress more even.
(6) The cross beam is 2 horizontal cross beams on the same straight line, so that the material use of the cross beam can be reduced, and the steel casing is prevented from being broken at the hole due to too many holes in the steel casing.
(7) When the crossbeam is the first setting mode, isolation structure's setting is the bonding degree between reduction crossbeam and loading post and the concrete, reduces test error.
(8) When the crossbeam is the first mode of setting up, the upper surface of gusset plate directly sets up the mould of pouring concrete, can make the step of model structure like this to the gusset plate can also continue to use after demolishing, has also reduced the waste of resource.
(9) The supporting structure and the gap of the supporting structure are arranged, and the gap is a space for downward movement of the steel casing.
(10) When the crossbeam is the second setting mode, the setting of pressurization part is when receiving ascending pulling force whole structure upward movement, prevents that steel pile casing and concrete from directly pulling up with the pulling force that steel pile casing received. The reinforcement plate in this manner functions to uniformly apply a force to the concrete by the pressing member. In this way, the direction of the force is upward, so that a supporting structure is not required, and only a gap for placing the steel pile casing below the concrete is required.
Drawings
Fig. 1 is a front sectional view showing an experimental model structure for the bonding characteristics of concrete and steel casing according to embodiment 1 of the present invention, which is installed in a support structure and a stand of a liquid press.
Fig. 2 is a top view of an experimental model structure for the bonding characteristics of concrete and steel casing in example 1 of the present invention.
Fig. 3 is a front sectional view showing an experimental model structure for the bonding characteristics of concrete and steel casing according to embodiment 2 of the present invention, which is mounted on a support structure and a stand of a liquid press.
Fig. 4 is a top view showing an experimental model structure related to the bonding characteristics of concrete and steel casing in embodiment 2 of the present invention.
The meaning of the reference symbols in the figures is as follows:
1-concrete 2-steel casing 3-cross beam 4-loading column 5-reinforcing plate 6-isolation structure
7-Liquid press 8-support structure 81-gap
Detailed Description
Example 1
As shown in fig. 1-2, an experimental model structure for bonding characteristics of concrete and a steel pile casing comprises a steel pile casing 2, a loading module and a reinforcing plate 5, wherein the loading module comprises a cross beam 3 and a loading column 4, the concrete 1 is respectively poured inside and outside the steel pile casing 2, the loading module is connected with the steel pile casing (2), and the loading module provides a force for stretching the steel pile casing 2 to separate the steel pile casing 2 from the concrete 1. The steel pile casing 2 is provided with a hole, the cross beam 3 passes through the hole in the steel pile casing 2 and is fixed on the steel pile casing 2, and one end of the loading column 4 is connected with the cross beam 3.
In this embodiment, the level of the cross beam 3 on the steel casing 2 is lower than the level of the lower surface of the concrete 1, and the other end of the steel casing 2 is higher than the level of the upper surface of the concrete 1. The reinforcing plate 5 is provided with a through hole through which the steel pile casing 2 passes, the reinforcing plate 5 is arranged below the concrete 1 outside the steel pile casing 2, the horizontal height of the lower surface of the reinforcing plate 5 is greater than that of the cross beam 3, the cross beam 3 is subjected to downward pressure, and the steel pile casing 2 is separated downwards relative to the concrete 1 during a test.
In this example a rebar structure of 28mm in diameter for both the loading post 4 and the cross beam 3. So that the loading column 4 and the cross beam 3 are ensured not to deform under the pressure of the liquid press 7, and the load applied by the liquid press 7 can be completely transferred to the steel pipe model. The reinforcing plate 5 is a steel plate having a thickness of not less than 5mm, and in this embodiment, the reinforcing plate 5 has a thickness of 10mm.
The loading column 4 is one, and the central axis in the length direction of the loading column 4 coincides with the central axis in the length direction of the steel casing 2. The center of the cross beam 3 is welded to the loading post 4, the cross beam 3 comprises at least 2 horizontal cross bars extending from the center of the cross bars to the outside of the holes in the steel casing 2, and the horizontal cross bars are arranged in an array about the center of the cross beam 3. In this embodiment the cross members 3 are 2 horizontal cross members in the same straight direction. The beam 3 and the loading column 4 are arranged in a mode that the stress of the steel casing 2 is more uniform.
The load module is provided with an isolation structure 6 at the contact point with the concrete 1. In this embodiment, the isolation structure 6 is a preservative film, which reduces the experimental cost and is convenient to operate.
The upper surface of the reinforcing plate 5 is provided with a mould structure for pouring concrete 1.
The support structure 8 is arranged below the reinforcing plate 5, and the support structure 8 below the cross beam 3 is provided with a gap 81.
Example 2
As shown in fig. 3-4, an experimental model structure for binding characteristics of concrete and a steel pile casing comprises a steel pile casing 2, a cross beam 3, a loading column 4 and a reinforcing plate 5, wherein concrete 1 is respectively poured between the inner side wall and the outer side wall of the steel pile casing 2, a hole through which the cross beam 3 passes is formed in the side wall of the upper part of the steel pile casing 2, one end of the loading column 4 is fixed on the cross beam, the other end is loaded with force for stretching the steel pile casing 2 to separate from the concrete 1, two ends of the steel pile casing 2 are both positioned outside the concrete 1, and the cross beam 3 on the steel pile casing 2 is also positioned outside the concrete 1.
In this embodiment, the horizontal height of the beam 3 is higher than that of the concrete 1, the reinforcing plate 5 is provided with a through hole through which the steel pile casing 2 passes, the reinforcing plate 5 is arranged above the concrete 1 outside the steel pile casing 2, the horizontal height of the upper surface of the reinforcing plate 5 is lower than that of the beam 3, the beam 3 is subjected to upward tension, and the steel pile casing 2 is separated upward relative to the concrete 1 during test.
The cross beam 3 comprises at least 2 horizontal cross bars extending from the centre of the cross beam 3 to the outside of the holes in the steel casing 2, said horizontal cross bars being arranged in an array about the centre of the cross beam 3. In this embodiment, the cross beams 3 are 4 horizontal cross beams arranged perpendicular to each other.
The number of the loading columns 4 is 5, one ends of the 5 loading columns 4 are respectively welded at the center of the cross beam 3 and the end parts of the 4 cross bars positioned outside the steel casing 2 correspondingly, and the 5 loading columns 4 are respectively connected with the liquid press 7.
In this embodiment, there is no contact between the rails, the loading posts 4 and the concrete 1, so that the isolation structure 6 is not required. The casting of the concrete 1 in this embodiment may use a casting mold of concrete 1 of wood, which also reduces costs.
In this embodiment the loading posts 4 and the cross beam 3 are each 30mm in diameter rebar structures. So that the loading column 4 and the cross beam 3 are ensured not to deform under the pressure of the liquid press 7, and the load applied by the liquid press 7 can be completely transferred to the steel pipe model. The reinforcing plate 5 is a steel plate having a thickness of not less than 5mm, and in this embodiment, the reinforcing plate 5 has a thickness of 8mm.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. The experimental model structure for the bonding characteristics of the concrete and the steel pile casing is characterized by comprising the steel pile casing (2) and a loading module, wherein the concrete (1) is respectively poured inside and outside the steel pile casing (2), the loading module is connected with the steel pile casing (2), the loading module provides a force for stretching the steel pile casing (2) to separate the steel pile casing (2) from the concrete (1), and both end parts of the steel pile casing (2) are positioned outside the concrete (1);
the loading module comprises a cross beam (3) and a loading column (4), wherein a hole is formed in the steel casing (2), the cross beam (3) penetrates through the hole in the steel casing (2) and is fixed on the steel casing (2), and one end of the loading column (4) is connected with the cross beam (3);
Still include gusset plate (5), the level of crossbeam (3) on steel pile casing (2) is less than the level of concrete (1) lower surface, be provided with the through-hole that steel pile casing (2) passed on gusset plate (5), gusset plate (5) set up the below of concrete (1) outside steel pile casing (2), the level of gusset plate (5) lower surface is greater than the level of crossbeam (3), during the test steel pile casing (2) are the decurrent form that breaks away from for concrete (1).
2. The experimental model structure related to the bonding characteristics of concrete and a steel casing according to claim 1, wherein the loading column (4) is one, and the central axis of the loading column (4) in the length direction coincides with the central axis of the steel casing (2) in the length direction.
3. An experimental model structure regarding the binding properties of concrete and steel casing according to claim 1, characterized in that the centre of the cross beam (3) is welded to the loading column (4), the cross beam (3) comprises at least 2 horizontal cross bars extending from the centre of the cross beam (3) to the outside of the holes in the steel casing (2), the horizontal cross bars being arranged in relation to the centre array of the cross beam (3).
4. An experimental model structure for the binding characteristics of concrete and steel casing according to claim 2, characterized in that the cross beams (3) are 2 horizontal cross bars in the same straight line direction.
5. Experimental model structure for the binding properties of concrete and steel casing according to claim 1, characterized in that the loading module is provided with an isolation structure (6) in contact with the concrete (1).
6. An experimental model structure for the binding characteristics of concrete and steel casing according to claim 1, characterized in that the upper surface of the reinforcing plate (5) is provided with a mould structure for pouring the concrete (1).
7. Experimental model structure with respect to the binding characteristics of concrete with steel casing according to claim 1, characterized in that the support structure (8) is arranged below the reinforcement plate (5), the support structure (8) below the cross beam (3) being provided with a gap (81); the upper surface of the reinforcing plate (5) is provided with a pressurizing part.
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| CN110296933B (en) * | 2019-06-27 | 2024-08-27 | 天津大学 | Bonding slip measuring device for steel tube concrete column push-out test |
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