CN109826249A - A kind of measuring device and measuring method of pile foundation side friction - Google Patents
A kind of measuring device and measuring method of pile foundation side friction Download PDFInfo
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- CN109826249A CN109826249A CN201910173377.XA CN201910173377A CN109826249A CN 109826249 A CN109826249 A CN 109826249A CN 201910173377 A CN201910173377 A CN 201910173377A CN 109826249 A CN109826249 A CN 109826249A
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- pile foundation
- measuring device
- partition
- baffle
- side friction
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Abstract
The invention discloses a kind of measuring devices of pile foundation side friction, measuring device includes steel reinforcement cage and circular bulkheads, partition is connected with the bottom of main reinforcement, one group of baffle plate assembly is equipped between two adjacent main reinforcements, baffle plate assembly includes baffle and traction piece, baffle is rotatably arranged on partition, and the hole wall that traction piece is used to draw baffle towards pile foundation rotates, so that free end is connected on the hole wall of pile foundation.When measuring the side friction of pile foundation using measuring device of the invention, measuring device is transferred in pile foundation, there are accommodating spaces between measuring device and the bottom hole of pile foundation, all baffles are formed for stopping the coarse aggregate of concrete to fall to the barrier structure in accommodating space, casting concrete again, when applying load to stake top, the concrete in accommodating space is fine aggregate, bearing capacity of pile tip will not be generated to pile foundation, therefore can directly and accurately measure to obtain pile foundation side friction.
Description
Technical field
The present invention relates to pile foundation engineering technique fields, and in particular to a kind of measuring device and measurement of pile foundation side friction
Method.
Background technique
Pile foundation is a kind of widely used base form.Stake is contacted with soil in side wall and end, due to soil layer
The interaction of variability and the stake soil of matter, it is resolved that the complexity of its stress.Friction pile bearing capacity of pile foundation is mainly held by stake end
Carry power and side friction composition, wherein side friction often account for bearing capacity of pile foundation specific gravity it is larger, be Design of Foundation and construction,
The important consideration index of bearing capacity of pile foundation detection, it is necessary to be examined by field test, detection method is widely used in pile foundation
All kinds of bearing capacity of pile foundation such as plinth accumulated loading test, self-balancing test and anchoring pile test detect business.For large-tonnage friction pile test pile
For engineering, if not considering bearing capacity of pile tip or being included in bearing capacity of pile tip with theoretical value, the practical side friction of pile body is only tested,
The load tonnage that will be greatly reduced in driving analysis test on piles, to reduce engineering risk and engineering cost, also can be improved driving analysis test on piles at
Power.Therefore, be to guarantee construction quality, rational evaluation bearing capacity of pile foundation, how directly it is accurate determine pile side friction size at
For critical issue.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of measurements of pile foundation side friction
Device and measurement method directly can accurately determine pile side friction size.
To achieve the above objectives, the technical solution adopted by the present invention is that being
A kind of measuring device of pile foundation side friction comprising:
Steel reinforcement cage comprising multiple main reinforcements；
Circular bulkheads are connected with the bottom of main ribs；
Multiple groups baffle plate assembly, be equipped with one group between two adjacent main reinforcements described in baffle plate assembly, and the baffle plate assembly packet
It includes:
Baffle comprising connecting pin and free end, the connecting pin are rotatably arranged on the partition；
Traction piece, the hole wall that the traction piece is used to draw the baffle towards pile foundation rotates, so that the free end
It is connected on the hole wall of pile foundation.
Based on the above technical solution, multiple through-holes are offered on the partition, the through-hole and main ribs
Quantity is identical and is arranged in a one-to-one correspondence, and main ribs are fixed with the partition through in the corresponding through-hole.
Based on the above technical solution, a circle channel is formed on the partition, the channel includes being circular layout
Multiple through-holes, multiple through-holes are evenly spaced on.
Based on the above technical solution, main ribs are connected by nut with the partition.
Based on the above technical solution, the connecting pin is connected by pin shaft with the partition, and all pin shafts enclose
If forming an annulus.
Based on the above technical solution, a towing pad is offered on the baffle, the traction piece includes:
Fixed pulley is fixed on the partition, and the fixed pulley is located at the outside of the connecting pin；
Traction fiber, one end are fixed on the baffle, and the other end bypasses the fixed pulley and extends to and leads across described
Pilot hole.
Based on the above technical solution, the bottom of the partition is fixed with cystosepiment, the cystosepiment and it is described every
The shape of plate is adapted.
Based on the above technical solution, the measuring device further includes reinforcing rib meter.
The present invention also provides a kind of methods using above-mentioned measuring device measurement pile foundation side friction comprising following step
It is rapid:
Multiple reinforcing rib meters are provided, are at least fixed at intervals with multiple reinforcing rib meters on the length direction of a main reinforcement；
The measuring device is transferred to pile foundation, and the bottom of the partition and the pile foundation is made to form a receiving
Space；
It is rotated by the hole wall that the traction piece draws the baffle towards pile foundation, so that the free end is connected to stake
On the hole wall on basis, all baffles are formed for stopping the coarse aggregate of concrete to fall to the blocking junction in the accommodating space
Structure；
The casting concrete into the steel reinforcement cage；
After concrete setting, load is loaded in stake top, the measured value of the reinforcing rib meter is read and calculates the side of pile foundation
Frictional resistance.
Based on the above technical solution, the horizontal plane where the reinforcing rib meter is the section of pile foundation, and pile foundation exists
The side friction of segment between two adjacent sections is calculated according to following formula:
In formula: qsFor the side friction of segment of the pile foundation between two adjacent sections, kPa；εs(n)It is n-th section
The measured value of face reinforcing rib meter, dimensionless；εs(n+1)For the measured value of (n+1)th section reinforcing rib meter, dimensionless；EsFor the bullet of main reinforcement
Property modulus, MPa；AsFor the total sectional area of all main reinforcements in n-th of section, mm2；EcFor the elasticity modulus of concrete, MPa；AcIt is
The net area of n section concrete, mm2；D is the diameter of section of pile foundation, m；H is segmental height, m.
Compared with the prior art, the advantages of the present invention are as follows:
A kind of measuring device of pile foundation side friction of the invention, measuring device include steel reinforcement cage and circular bulkheads, every
Plate is connected with the bottom of main reinforcement, one group of baffle plate assembly is equipped between two adjacent main reinforcements, baffle plate assembly includes baffle and traction
Part, baffle are rotatably arranged on partition, and the hole wall that traction piece is used to draw baffle towards pile foundation rotates, so that free end is supported
It is connected on the hole wall of pile foundation.When measuring the side friction of pile foundation using measuring device of the invention, measuring device is transferred
Into pile foundation, there are accommodating spaces between measuring device and the bottom hole of pile foundation, reuse traction piece and draw baffle towards stake
The hole wall rotation on basis, so that free end is connected on the hole wall of pile foundation, all baffles are formed for stopping concrete
Coarse aggregate falls to the barrier structure in accommodating space, then casting concrete, and the coarse aggregate in concrete, which is blocked, to fall
Into accommodating space, when applying load to stake top, the concrete in accommodating space is fine aggregate, will not generate stake end to pile foundation
Bearing capacity, therefore can directly and accurately measure to obtain pile foundation side friction.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the measuring device of pile foundation side friction in the embodiment of the present invention；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the partial enlarged view of Fig. 1；
Fig. 4 is the schematic diagram of the measurement method of the side friction of segment of the pile foundation between two adjacent sections.
In figure: 1- steel reinforcement cage, 10- main reinforcement, 2- partition, 20- through-hole, 3- baffle plate assembly, 30- baffle, the connecting pin 300-,
The free end 301-, 302- towing pad, 31- traction piece, 310- fixed pulley, 311- traction fiber, 32- pin shaft, 4- pile foundation, 5- spiral shell
Mother, 6- cystosepiment, 7- reinforcing rib meter, 8- accommodating space.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
Shown in Figure 1, the embodiment of the present invention provides a kind of measuring device of pile foundation side friction, and measuring device includes
Steel reinforcement cage 1, steel reinforcement cage 1 include multiple main reinforcements 10 and multiple stirrups, and multiple intervals of main reinforcement 10, which are arranged and enclose, to be set to form steel reinforcement cage 1
Cylindric frame, multiple intervals of steel reinforcement cage 1 are set on cylindric frame, form steel reinforcement cage 1.Measuring device further include it is round every
Plate 2, partition 2 are connected with the bottom of main reinforcement 10, and the bottom of multiple main reinforcements 10 is circle, and the diameter of circular bulkheads 2 is than steel reinforcement cage 1
The diameter of bottom is big, and when designing the diameter of partition 2, is designed according to the size in the aperture of the pile foundation 4 of exploration, in order to
It will be arrived in pile foundation 4 below measuring device of the invention, the aperture of the ratio pile foundation 4 of the diameter design of partition 2 is small, in conjunction with pile foundation
The steel plate that the aperture selection planar dimension and thickness of plinth 4 are suitable makees partition 2, it is desirable that the steel plate diameter is smaller than the aperture of pile foundation 4
5cm is advisable, and has certain strength and stiffness, can carry the self weight of pile foundation 4 and not occur obviously to deform.
Measuring device further includes multiple groups baffle plate assembly 3, and one group of baffle plate assembly 3 is equipped between two adjacent main reinforcements 10, and
Baffle plate assembly 3 includes baffle 30 and traction piece 31, and baffle 30 includes connecting pin 300 and free end 301, and connecting pin 300 can be rotated
Ground is set on partition 2, and free end 301 is freely rotated with connecting pin 300；Traction piece 31 is for drawing baffle 30 towards pile foundation
4 hole wall rotation, so that free end 301 is connected on the hole wall of pile foundation 4.Pile foundation is measured using measuring device of the invention
Side friction when, measuring device is transferred in pile foundation 4, there are receiving is empty between measuring device and the bottom hole of pile foundation 4
Between 8, reuse traction piece 31 draw baffle 30 towards pile foundation 4 hole wall rotate so that free end 301 is connected to pile foundation 4
Hole wall on, all baffle 30 is formed for stopping the coarse aggregate of concrete to fall to the barrier structure in accommodating space 8, then
Casting concrete, the coarse aggregate in concrete are blocked and will not fall on down in accommodating space 8, when applying load to stake top, receiving
Concrete in space 8 is fine aggregate, will not generate bearing capacity of pile tip to pile foundation 4, therefore can directly and accurately measure to obtain
Pile foundation side friction.
It is shown in Figure 2, multiple through-holes 20 are offered on partition 2, through-hole 20 is identical as the quantity of main reinforcement 10 and one is a pair of
It should be arranged, main reinforcement 10 is and fixed with partition 2 through in corresponding through-hole 20.Partition 2 and steel reinforcement cage in the embodiment of the present invention
1 coaxial arrangement, first carries out processing of reeling off raw silk from cocoons to the bottom of main reinforcement 10, by the bottom finish rolling of main reinforcement 10 at helicitic texture, by main reinforcement 10
In corresponding through-hole 20, then nut 5 is screwed on, the bottom of main reinforcement 10 and partition 2 is fixed.20 diameter of through-hole is than main reinforcement diameter
Big 2mm is advisable.
It is shown in Figure 2, a circle channel is formed on partition 2, channel includes the multiple through-holes 20, Duo Getong being circular layout
Hole 20 is evenly spaced on.Channel and partition 2 in the embodiment of the present invention are coaxially disposed, and are equipped between two adjacent through-holes 20
One baffle 30 can preferably stop the coarse aggregate in concrete to fall.
Shown in Figure 2, connecting pin 300 is connected by pin shaft 32 with partition 2, and all pin shafts 32, which enclose, to be set to form a circle
Ring.Annulus is also coaxially disposed with partition so that all baffles 30 formed for stopping the coarse aggregate of concrete to fall to receipts
Holding the barrier structure in space 8 is also circle, and free end 301 can be made preferably to be connected on the hole wall of pile foundation 4.
It is shown in Figure 3, a towing pad 302 is offered on baffle 30, traction piece 31 includes fixed pulley 310 and traction fiber
311, fixed pulley 310 is fixed on partition 2, and fixed pulley 310 is located at the outside of connecting pin 300；One end of traction fiber 311 is fixed
In on baffle 30, the other end is around fixed pulley 310 and extends to across towing pad 302.The traction fiber 311 of the embodiment of the present invention is adopted
With high tensile steel wire, intensity is high, and good toughness can slide on fixed pulley 310 and portion is easily broken.In order to by measuring device it is smooth under
It is put into pile foundation, first passes through the inside that baffle 30 is gone to partition 2 by traction traction fiber 311, measuring device transfers to pile foundation
Interior and then pulling traction fiber 311 rotates baffle 30, so that free end 301 is connected on the hole wall of pile foundation 4, it is then solid
Determine traction fiber 311, avoids sliding.
Shown in Figure 1, the bottom of partition 2 is fixed with cystosepiment 6, and cystosepiment 6 is adapted with the shape of partition 2.If having
A small amount of coarse aggregate is fallen in accommodating space 8, and when stake top applies load, cystosepiment 6 plays barrier and buffering steel reinforcement cage 1 and thick
Active force between aggregate weakens the bearing capacity of pile tip that coarse aggregate generates, so that the measurement result of pile foundation side friction is more smart
Really.Barrier cystosepiment 6 is completely spread in the bottom of partition 2, thickness is advisable with 15~20cm, and embedding inlay technique is used at the nut 5 of main reinforcement 10
Installation.Ensure that cystosepiment 6 and the bottom adhesive of partition 2 are firm, prevents it from loosely falling off in 1 decentralization process of steel reinforcement cage.
Shown in Figure 4, measuring device further includes reinforcing rib meter 7.Reinforcing rib meter 7 is bound or is welded in main reinforcement 10, together
It transfers in pile foundation 4, obtains the measured value of reinforcing rib meter 7, the side friction of pile foundation 4 is calculated.
The method for the measuring device measurement pile foundation side friction that the present invention also provides a kind of using in above-described embodiment,
The following steps are included:
Multiple reinforcing rib meters 7 are provided, are at least fixed at intervals with multiple reinforcing rib meters 7 on the length direction of a main reinforcement 10；
Measuring device is transferred to pile foundation 4, steel reinforcement cage 1 is suspended in midair, the bottom of partition 2 and pile foundation 4 is made to form one
Accommodating space 8；
It is rotated by the hole wall that traction piece 31 draws baffle 30 towards pile foundation 4, so that free end 301 is connected to pile foundation
On 4 hole wall, all baffles 30 are formed for stopping the coarse aggregate of concrete to fall to the barrier structure in accommodating space 8；
The casting concrete into steel reinforcement cage 1, the coarse aggregate in concrete are blocked in partition top, in accommodating space 8 only under
Fall fine aggregate；
After concrete setting, suspension apparatus is withdrawn, load is loaded in stake top, reads the measured value of reinforcing rib meter 7 and calculating
The side friction of pile foundation 4.
Calculation formula is as follows:
Horizontal plane where reinforcing rib meter 7 is the section of pile foundation 4, segment of the pile foundation 4 between two adjacent sections
Side friction calculated according to following formula:
In formula: qsFor the side friction of segment of the pile foundation 4 between two adjacent sections, kPa；εs(n)It is n-th section
The measured value of face reinforcing rib meter 7, dimensionless；εs(n+1)For the measured value of (n+1)th section reinforcing rib meter 7, dimensionless；EsFor main reinforcement
Elasticity modulus, MPa；AsFor the total sectional area of all main reinforcements in n-th of section, mm2；EcFor the elasticity modulus of concrete, MPa；AcFor
The net area of n-th of section concrete, mm2；D is the diameter of section of pile foundation 4, m；H is segmental height, m.
Wherein, the elasticity modulus of main reinforcement is determined according to the model of reinforcing bar according to specification, AsIt does not include the stirrup of steel reinforcement cage 1
Sectional area；The elasticity modulus of concrete is that the concrete test block measurement made before casting concrete obtains；Concrete it is net
Area is that the sectional area of n-th of section pile foundation 4 subtracts the total sectional area of all main reinforcements in n-th of section；In Practical Project, also need
The hole quality detection for carrying out pile foundation 4, can be obtained the effective aperture of each layer cross section of pile foundation, under normal circumstances, each layer cross section
Pore size difference it is smaller, therefore d takes the practical stake diameter after pile.
It is again total pile side friction, the calculation method of the embodiment of the present invention by the side friction sum of each segment
Directly accurate, easily implementation；Load tonnage is reduced, engineering risk is reduced；Loading equipemtn, load bearing equipment investment, drop is greatly decreased
Low engineering cost.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of measuring device of pile foundation side friction, characterized in that it comprises:
Steel reinforcement cage (1) comprising multiple main reinforcements (10)；
Circular bulkheads (2) are connected with the bottom of main ribs (10)；
Multiple groups baffle plate assembly (3), be equipped with one group between two adjacent main reinforcements (10) described in baffle plate assembly (3), and the baffle
Component (3) includes:
Baffle (30) comprising connecting pin (300) and free end (301), the connecting pin (300) are rotatably arranged in described
On partition (2)；
Traction piece (31), the hole wall that the traction piece (31) is used to draw the baffle (30) towards pile foundation (4) rotate, with
It is connected to the free end (301) on the hole wall of pile foundation (4).
2. measuring device as described in claim 1, which is characterized in that offer multiple through-holes (20), institute on the partition (2)
It is identical as the quantity of main ribs (10) and be arranged in a one-to-one correspondence to state through-hole (20), main ribs (10) are through corresponding described
In through-hole (20), and it is fixed with the partition (2).
3. measuring device as claimed in claim 2, which is characterized in that be formed with a circle channel, the channel packet on the partition (2)
The multiple through-holes (20) being circular layout are included, multiple through-holes (20) are evenly spaced on.
4. measuring device as claimed in claim 2, which is characterized in that main ribs (10) pass through nut (5) and the partition (2) phase
Even.
5. measuring device as claimed in claim 1, which is characterized in that the connecting pin (300) passes through pin shaft (32) and the partition
(2) it is connected, all pin shafts (32), which enclose, to be set to form an annulus.
6. measuring device as claimed in claim 1, which is characterized in that it is offered a towing pad (302) on the baffle (30), it is described
Traction piece (31) includes:
Fixed pulley (310) is fixed on the partition (2), and the fixed pulley (310) is located at the connecting pin (300)
Outside；
Traction fiber (311), one end are fixed on the baffle (30), and the other end is around the fixed pulley (310) and extends to
Across the towing pad (302).
7. measuring device as claimed in claim 1, which is characterized in that the bottom of the partition (2) is fixed with cystosepiment (6), described
Cystosepiment (6) is adapted with the shape of the partition (2).
8. measuring device as claimed in claim 1, which is characterized in that the measuring device further includes reinforcing rib meter (7).
9. a kind of method using measuring device as claimed in claim 1 measurement pile foundation side friction, which is characterized in that it includes
Following steps:
It provides multiple reinforcing rib meters (7), multiple reinforcing rib meters (7) is fixed at intervals on the length direction of an at least main reinforcement (10)；
The measuring device is transferred to pile foundation (4), and forms the partition (2) and the bottom of the pile foundation (4)
One accommodating space (8)；
It is rotated by the hole wall that the traction piece (31) draw the baffle (30) towards pile foundation (4), so that the free end
(301) it is connected on the hole wall of pile foundation (4), all baffles (30) are formed for stopping the coarse aggregate of concrete to fall to institute
State the barrier structure in accommodating space (8)；
To the steel reinforcement cage (1) interior casting concrete；
After concrete setting, load is loaded in stake top, the measured value of the reinforcing rib meter (7) is read and calculates pile foundation (4)
Side friction.
10. method as claimed in claim 9, which is characterized in that the horizontal plane where the reinforcing rib meter (7) is cutting for pile foundation (4)
The side friction in face, segment of the pile foundation (4) between two adjacent sections is calculated according to following formula:
In formula: qsFor the side friction of segment of the pile foundation (4) between two adjacent sections, kPa；εs(n)For n-th of section
The measured value of reinforcing rib meter (7), dimensionless；εs(n+1)For the measured value of (n+1)th section reinforcing rib meter (7), dimensionless；EsFor main reinforcement
Elasticity modulus, MPa；AsFor the total sectional area of all main reinforcements in n-th of section, mm2；EcFor the elasticity modulus of concrete, MPa；Ac
For the net area of n-th of section concrete, mm2；D is the diameter of section of pile foundation (4), m；H is segmental height, m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910173377.XA CN109826249B (en) | 2019-03-07 | 2019-03-07 | Pile foundation side friction resistance measuring device and measuring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910173377.XA CN109826249B (en) | 2019-03-07 | 2019-03-07 | Pile foundation side friction resistance measuring device and measuring method |
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| CN109826249A true CN109826249A (en) | 2019-05-31 |
| CN109826249B CN109826249B (en) | 2023-08-22 |
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| CN110331742A (en) * | 2019-07-01 | 2019-10-15 | 浙江大学 | It is a kind of to test the quiet experimental rig and test method for boring and taking root in a pile-soil interface frictional behavior |
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| CN109826249B (en) | 2023-08-22 |
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