CN114753417A - Foundation bearing capacity detection device and method - Google Patents
Foundation bearing capacity detection device and method Download PDFInfo
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- CN114753417A CN114753417A CN202210297773.5A CN202210297773A CN114753417A CN 114753417 A CN114753417 A CN 114753417A CN 202210297773 A CN202210297773 A CN 202210297773A CN 114753417 A CN114753417 A CN 114753417A
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- ground pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D11/00—Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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Abstract
The invention discloses a foundation bearing capacity detection device and a foundation bearing capacity detection method, wherein the detection device comprises the following steps: the ground pile assembly does not need to be rotated by multiple persons, and can be driven to be inserted or pulled out only by driving the crankshaft to rotate through the electric drill. The ground pile driving assembly simultaneously takes the pulling and inserting effects into consideration, and can drive the side teeth and the overturning piece to act, so that the labor is greatly saved. The ground stake subassembly is in the shrink state at the in-process of inserting, and the side tooth can not destroy the former soil around, when the side tooth stretches out, can promote greatly and grab the land fertility. After the ground stake subassembly is accomplished the fixed of base, the base still upwards stimulates certain distance through strutting arrangement to the ground stake subassembly, and this distance makes earth have certain, and decurrent pretension to the ground stake subassembly, and at the in-process that carries out bearing capacity and detect like this, the base is fixed by strutting arrangement and ground stake subassembly simultaneously in upper and lower direction, and overall structure is very stable, has guaranteed the measuring accuracy.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a foundation bearing capacity detection device and a foundation bearing capacity detection method.
Background
The bearing capacity of the foundation is the bearing potential exerted along with the increase of the load on the unit area of the foundation soil. Under the action of load, the foundation deforms. Along with the increase of load, the foundation deformation increases gradually, and the stress in the foundation soil is in an elastic balance state at the initial stage, so that the foundation has safe bearing capacity. When the load is increased to the point or small area in the foundation, the shear stress of each point in a certain direction plane reaches the shear strength of the soil, the point or small area is subjected to shear failure and is in a limit balance state, and the stress in the soil is redistributed.
The spiral plate load test device is a commonly used method for detecting the bearing capacity of a foundation in the prior art, as shown in fig. 1, the uppermost crossbeam in fig. 1 is fixed through two ground anchors, and the bottom dial indicator crossbeam seat is also fixed through the ground anchors. Due to the use of conventional helical ground anchors, larger ground anchors or ground anchors rotated to greater depths are required when the test range is large. As the helical blade can damage the soil above and cut the soil in the process of screwing into the ground, and the rotation of the ground anchor is time-consuming and labor-consuming. On the other hand, when the distance between the adjacent ground anchors is short, one of the ground anchors can drive the nearby ground anchor to move up and down through the soil when moving up and down.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a foundation bearing capacity detection device and a foundation bearing capacity detection method, and mainly solves the technical problems that the foundation bearing capacity detection precision is not high, and time and labor are wasted in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
foundation bearing capacity detection device: the pile foundation comprises a base and at least three ground pile assemblies for fixing the base, wherein a middle support and an upper support are sequentially arranged above the base, the upper support is provided with an oil cylinder capable of transversely moving, and a power output end of the oil cylinder is provided with a detachable dowel bar;
the dowel bar is sequentially provided with a test disc, a force sensor and a spiral bearing plate from top to bottom;
the middle support is provided with a rotary driving piece for driving the dowel bar to rotate, and the rotary driving piece is detachably connected with the dowel bar.
Preferably, the foundation bearing capacity detection device of the foundation: the section of the force transmission rod is a regular polygon;
the rotary driving piece comprises a driving disc and clamping blocks, the driving disc is rotatably connected to the middle support, at least two clamping blocks are arranged, and when the clamping blocks are clamped on the outer surface of the dowel bar and placed in the driving disc, the clamping blocks and the dowel bar can synchronously rotate;
the lower side of the driving disc is provided with end face teeth, and the end face teeth are driven by driving teeth arranged on the base.
Preferably, the foundation bearing capacity detection device of the foundation: the base is connected the ground stake subassembly through fixed cover, and the lateral part of fixed cover is equipped with fixed cover articulated shaft, and fixed cover articulated shaft articulates there is the base connecting axle of the fixed cover articulated shaft of perpendicular to, and the base cup joints in the base connecting axle through the cover barrel.
Preferably, the foundation bearing capacity detection device of the foundation: the ground pile assembly comprises a ground pile body, telescopic side teeth are arranged on the side portion of the ground pile body, a foldable overturning piece is arranged at the bottom of the ground pile assembly, and the side teeth and the overturning piece are driven by a guide piece;
when the ground pile assembly is in a use state, the side teeth are in an extending state, and the overturning piece is in an everting state;
when the ground pile assembly is in a plugging state, the side teeth are in a contraction state, and the overturning piece is in an inward folding state.
Preferably, the foundation bearing capacity detection device of the foundation: the side part of the inner end of the side tooth is provided with a driving pin, the guide piece is provided with a guide groove matched with the driving pin, and the bottom of the guide piece is provided with a lower driving end;
when the ground pile assembly is in a use state, the driving pin is positioned at the upper end of the guide groove, and the lower driving end is connected with the overturning piece, so that the overturning piece is in an everting state;
when the ground pile assembly is in a plugging state, the driving pin is positioned at the lower end of the guide groove;
preferably, the foundation bearing capacity detection device of the foundation: the guide groove comprises a chute and a vertical groove which are sequentially connected from top to bottom, when the driving pin is positioned at the uppermost end of the vertical groove, the lower driving end enables the turning piece to be in an everting state, and the side teeth are in a contracting state.
Preferably, the foundation bearing capacity detection device of the foundation: the ground stake is this internal through the side tooth mounting groove connection side tooth, and the side tooth is flexible from two opposite faces of ground stake body respectively, and the guide sets up in the clearance of side tooth mounting groove and ground stake body internal surface.
Preferably, the foundation bearing capacity detection device of the foundation: the ground pile driving assembly comprises an inserting sleeve and a crankshaft mounting sleeve capable of axially moving relative to the inserting sleeve, the crankshaft mounting sleeve is provided with a crankshaft, and the crankshaft is connected with a pendulum bob capable of axially sliding along the inserting sleeve through a connecting rod;
an upper impact block is arranged in the plug bush;
the connecting rod drives the pendulum bob to move upwards and downwards through the two springs respectively;
when the crankshaft mounting sleeve moves to a relatively higher position, the crankshaft drives the pendulum bob to impact the impact block, and the pendulum bob does not extend out of the lower end of the plug bush;
when the crankshaft mounting sleeve moves to a relatively lower position, the crankshaft drives the pendulum bob to extend out of the lower end of the plug bush, and the pendulum bob does not impact the upper impact block.
Preferably, the foundation bearing capacity detection device of the foundation: the plug bush is connected with the guide piece through a connecting block, and the connecting block is arranged on a limiting long hole in the side part of the ground pile body;
when the connecting block moves to the bottommost part of the limiting long hole, the side teeth are in an extending state, and the overturning piece is in an outwards-turning state;
when the connecting block moves to the uppermost end of the limiting long hole, the side teeth are in a contraction state.
The detection method of the foundation bearing capacity detection device adopts the foundation bearing capacity detection device: comprises the following steps:
placing a base at a to-be-measured place, and supporting a ground pile assembly joint of the base through a supporting device;
driving the ground pile component to a preset depth through the ground pile driving component, enabling the side teeth to be in an extending state, and enabling the overturning piece to be in an everting state;
connecting the base to all the ground pile assemblies, and enabling the base to be in a horizontal state;
adjusting the supporting device to enable the ground pile assembly to generate upward tension F, wherein the range of the tension F is equal to 10% -30% of the maximum tension range which can be borne by the ground pile assembly;
the dowel bar is driven to rotate by the rotary driving piece, and the dowel bar is driven to drill to a preset depth;
inserting the oil cylinder into the notch, and connecting the power output end of the oil cylinder with the uppermost end of the dowel bar;
fixing the magnetic meter seat on the middle bracket, and contacting the trigger end of the dial indicator with the test disc;
starting the oil cylinder, testing according to the test rule, reading and recording the data of the force sensor on the dowel bar and the displacement of the dial indicator;
and loosening the supporting device, and pulling out the ground pile assembly through the ground pile driving assembly.
The invention achieves the following beneficial effects:
compared with the prior art, the ground pile disclosed by the invention does not need to be rotated by a plurality of people, and the ground pile assembly can be driven to be inserted or pulled out only by driving the crankshaft to rotate through the electric drill. The ground pile driving assembly simultaneously takes the pulling and inserting effects into consideration, and can drive the side teeth and the overturning piece to act, so that the labor is greatly saved.
The ground stake subassembly is in the shrink state at the in-process of inserting, and the original soil around can not destroying, when the side tooth stretches out, can promote greatly and grab the land fertility.
After the ground stake subassembly is accomplished the fixed of base, the base still upwards stimulates certain distance through strutting arrangement to the ground stake subassembly, and this distance makes earth have certain, and decurrent pretension to the ground stake subassembly, and at the in-process that carries out bearing capacity and detect like this, the base is fixed by strutting arrangement and ground stake subassembly simultaneously in upper and lower direction, and overall structure is very stable, has guaranteed the measuring accuracy.
Drawings
FIG. 1 is a front view of a foundation screw plate load testing device in the prior art;
FIG. 2 is an overall block diagram of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is an exploded view of the rotary drive member of the present invention;
FIG. 5 is a front view of the ground pile assembly, ground pile driving assembly of the present invention;
FIG. 6 is a partial enlarged view at B in FIG. 5;
FIG. 7 is a view of the internal structure of the ground pile assembly and ground pile driving assembly of the present invention;
FIG. 8 is an enlarged view of a portion of FIG. 7 at C;
FIG. 9 is an enlarged view of a portion of FIG. 7 at D;
FIG. 10 is an exploded view of a portion of the interior of the ground pile assembly of the present invention;
FIG. 11 is a cross-sectional view of the bottom of the ground pile assembly;
FIG. 12 is a view of the everting member in an everted state;
FIG. 13 is a view of the construction of the flipper;
FIG. 14 is a partial block diagram of the pile body (at the connection block);
FIG. 15 is a partial development of the guide member and sleeve;
the meaning of the reference numerals: 1-a base; 2-upper support; 3-a magnetic gauge stand; 4-a dowel bar; 5-a middle bracket; 6-overturning the part; 7-a ground pile assembly; 8-a ground pile driving assembly; 11-a sleeve; 21-a chute; 22-notches; 23-oil cylinder; 41-spiral bearing plate; 42-a test disc; 51-a drive disc; 511-square hole one; 512-ring groove; 513-end face teeth; 514-driving teeth; 52-a clamping block; 61-a drive end; 71-a ground pile body; 72-a fixation sleeve; 721-fixed sleeve articulated shaft; 722-a base connecting shaft; 711-side cover; 712-a stop block; 73-side teeth; 731-drive pin; 74-lower drive end; 75-connecting block; 76-a guide; 761-chute; 762-vertical slots; 763 inserting grooves; 77-side tooth mounting groove; 81-inserting sleeve; 811-upper bump block; 812-a plug; 82-crankshaft mounting sleeve; 83-crankshaft; 84-a connecting rod; 841-a spring; 85-pendulum bob.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 2 to 15: this embodiment discloses foundation basis bearing capacity detection device: including base 1, the at least three ground stake subassembly 7 that is used for unable adjustment base 1, base 1 top is equipped with middle support 5, upper bracket 2 in proper order.
The upper bracket 2 is provided with an oil cylinder 23 which can move transversely, the transverse movement means that the upper bracket 2 is provided with a sliding groove 21, a notch 22 is arranged in the sliding groove 21, and the sliding groove 21 can clamp a flange at the end part of the oil cylinder 23. When the cylinder 23 is caught in the slide groove 21, the cylinder 23 can be fixed to the upper bracket 2. When the cylinder is removed from the upper bracket 2, the installation of the dowel bar 4 is facilitated.
The power output end of the oil cylinder 23 is provided with a detachable dowel bar 4; the connection mode of the distance between the dowel bar 4 and the power output end of the oil cylinder 23 belongs to the prior art, and the embodiment is not specifically described.
The dowel bar 4 is sequentially provided with a test disc 42, a force sensor and a spiral bearing plate 41 from top to bottom; the test disc 42 is used to trigger a dial indicator.
The intermediate bracket 5 is provided with a rotary driving member for driving the dowel bar 4 to rotate, and the rotary driving member is detachably connected with the dowel bar 4, as shown in fig. 3 and 4: the cross section of the dowel bar 4 is a regular polygon, and a regular hexagon is usually adopted. The rotary driving piece comprises a driving disc 51 and clamping blocks 52, the driving disc 51 is rotatably connected to the middle support 5, at least two clamping blocks 52 are arranged, and when all the clamping blocks 52 are clamped on the outer surface of the dowel bar 4 and placed inside the driving disc 51, the inner outline of all the clamping blocks 52 is matched with the section of the dowel bar 4. Furthermore, the section of the clamping block 52 is also a regular hexagon and is matched with the first square hole 511 in the driving disc 51, so that the driving disc 51, the clamping block 52 and the dowel bar 4 can synchronously rotate. The driving disc 51 is provided with a ring groove 512 at the outer side, the ring groove 512 is clamped in the inner hole of the middle bracket 5, an end face tooth 513 is arranged below the driving disc 51, and the end face tooth 513 is driven by a driving tooth 514 arranged on the base 1. The central axis of the driving tooth 514 is horizontal and may be connected to an external driving member, such as a motor.
The base 1 is connected with the ground pile component 7 through the fixed sleeve 72, the side part of the fixed sleeve 72 is provided with a fixed sleeve hinge shaft 721, the fixed sleeve hinge shaft 721 is hinged with a base connecting shaft 722 vertical to the fixed sleeve hinge shaft 721, and the base 1 is sleeved on the base connecting shaft 722 through the sleeve 11. Therefore, in a certain range, the ground pile component 7 can freely swing and be adjusted up and down relative to the base 1, and the distance between the ground pile component 7 and the base 1 can also be adjusted, so that the actual use requirement is met. Fixing sleeve 72 and
with emphasis on fig. 8 to 15: the ground pile assembly 7 of the embodiment comprises a ground pile body 71, telescopic side teeth 73 are arranged on the side portion of the ground pile body 71, a foldable overturning part 6 is arranged at the bottom of the ground pile assembly 7, and the side teeth 73 and the overturning part 6 are driven by a guide part 76. When the pile assembly 7 is in use, the side teeth 73 are in the extended condition and the upender 6 is in the everted condition (figure 12); therefore, soil can be hooked, and the ground pile component 7 can bear large pulling force and is prevented from being pulled out.
When the pile assembly 7 is in the plugged and unplugged state, the side teeth 73 are in the retracted state and the upender 6 is in the folded-in state, which facilitates the plugging and unplugging of the pile assembly 7.
The side part of the inner end of the side tooth 73 is provided with a driving pin 731, the guide piece 76 is provided with a guide groove matched with the driving pin 731, and the bottom of the guide piece 76 is provided with a lower driving end 74. When the ground pile assembly 7 is in a use state, the driving pin 731 is positioned at the upper end of the guide groove, and the lower driving end 74 is connected with the turnover piece 6, so that the turnover piece 6 is in an eversion state; when the pile assembly 7 is in the inserted and extracted state, the driving pin 731 is located at the lower end of the guide groove.
The guide groove includes a slant groove 761 and a vertical groove 762 connected in sequence from top to bottom, and when the driving pin 731 is located at the uppermost end of the vertical groove 762 (at the interface of the vertical groove 762 and the slant groove 761), the lower driving end 74 makes the inside-out state of the flipper 6, and the side teeth 73 are in the contracted state, which indicates that: when the guide member 76 moves from top to bottom, the turning member 6 is turned outwards, and the driving pin 731 is pushed out of the pile body 71.
The ground pile body 71 is internally connected with the side teeth 73 through the side tooth mounting grooves 77, the side teeth 73 respectively extend and retract from two opposite surfaces of the ground pile body 71, the guide piece 76 is arranged in a gap between the side tooth mounting grooves 77 and the inner surface of the ground pile body 71, and the guide piece 76 drives the side teeth 73 at two sides to extend out simultaneously, so that the stress of the guide piece 76 is more balanced; furthermore, the side tooth mounting groove 77 and the inner wall of the ground pile body 71 can play a good role in guiding the guide piece 76.
In order to facilitate the insertion or extraction of the pile assembly 7, the present embodiment further comprises a pile driving assembly 8, wherein the pile driving assembly 8 comprises a sleeve 81, and a crankshaft mounting sleeve 82 axially movable relative to the sleeve 81, the crankshaft mounting sleeve 82 is provided with a crankshaft 83, and the crankshaft 83 is connected to a pendulum 85 axially slidable along the sleeve 81 through a connecting rod 84. The axial movement of the crankshaft mounting sleeve 82 along the insert sleeve 81 can be achieved by providing a kidney-shaped hole in the crankshaft mounting sleeve 82.
An upper impact block 811 is arranged in the insert sleeve 81; the link 84 drives the pendulum bob 85 to move upwards and downwards through two springs 841 respectively; when the crank mounting sleeve 82 is moved relatively high, the crank 83 drives the pendulum 85 to strike the striking block 811, and the pendulum 85 does not extend beyond the lower end of the socket 81, at which point the pile driving assembly 8 provides a continuous upward striking force.
When the crank mounting sleeve 82 moves to a relatively low position, the crank 83 drives the pendulum 85 to extend out of the lower end of the insert 81, and the pendulum 85 does not strike the upper striking block 811. The pendulum 85 can strike the upper end of the guide 76.
It should be noted that: when the crankshaft mounting sleeve 82 is adjusted along the insert sleeve 81, the movement range of the pendulum 85 is adjusted accordingly, but since the connecting rod 84 drives the pendulum 85 to move upward and downward through the two springs 841 respectively, the springs 841 have a certain amount of elastic compression and expansion, so that when the pendulum 85 hits the upper striking block 811 or the upper end of the guide member 76, the normal rotation of the crankshaft 83 is not affected, and when the crankshaft 83 rotates at a higher speed, the pendulum 85 can generate a larger and continuous impact force, which can make the pile driving assembly 8 generate a high-frequency impact force in an upward or downward direction.
When the pile assembly 7 needs to be pulled out, the guide member 76 needs to be pulled upwards first, so that the side teeth 73 are contracted, and the overturning member 6 can be freely and inwards unlocked.
The method comprises the following steps: the plug bush 81 is provided with a plug 812, a slot 763 is arranged above the guide piece 76, the plug 812 and the slot 763 are both provided with jacks, when the plug 812 is inserted into the slot 763, the two jacks are opposite, the plug bush 81 can be connected to the upper end of the guide piece 76 by inserting the connecting block 75 into the two jacks, in order to achieve a limiting effect, the side portion of the ground pile body 71 is preferably provided with a limiting long hole 712, two ends of the connecting block 75 are located inside the limiting long hole 712, and the limiting long hole 712 can be covered by the side cover 711. When the insertion sleeve 81 is connected with the guide member 76 through the connecting block 75, the insertion or extraction of the pile assembly 7 can be realized only by adjusting the height of the crankshaft mounting sleeve 82.
The inserting sleeve 81 is in a step shape (fig. 6), the smaller diameter part of the lower end can be inserted into the upper end of the ground pile body 71, the larger diameter part of the upper end is approximately consistent with the outer contour of the ground pile body 71, the side teeth 73 are required to be in a contraction state at the initial stage of downward impact of the ground pile assembly 7, the overturning part 6 is in an inward folding state, and the end part of the inwards folding overturning part 6 is in a conical shape, so that the inserting sleeve can be conveniently inserted into the ground. Therefore, in the initial stage of inserting the ground pile assembly 7, the spacer bush with the U-shaped structure can be clamped into the lower end of the insertion bush 81, and the two ends of the spacer bush respectively abut against the lower end of the larger diameter end of the insertion bush 81 and the upper end of the ground pile body 71, so that the downward impact force of the ground pile driving assembly 8 is prevented from being driven to the guide 76. When the ground pile component 7 is inserted to a preset depth, the spacer sleeves can be taken down, the impact force of the ground pile driving component 8 can directly impact the guide piece 76, the turnover piece 6 is firstly turned outwards, in the process that the turnover piece 6 is turned outwards, the vertical groove 762 does not drive the side teeth 73 to extend out, the turnover piece 6 can drive the ground pile component 7 to continue to move downwards for a certain distance, and when the 731 driving pin moves to the inclined groove 761, the side teeth 73 can be slowly driven to extend out.
The upper end of the turning part 6 is provided with a driving end 61 which is used for being matched with the lower driving end 74, and the turning part 6 preferably adopts a replaceable design, so that the use requirements of different soil qualities are met, and the phenomenon that the turning part cannot be turned outwards when the soil qualities are too hard is avoided.
And when the connecting block 75 moves to the bottommost part of the limiting long hole 712, the side teeth 73 are in an extending state, and the turnover piece 6 is in an everting state; when the link block 75 moves to the uppermost end of the stopper long hole 712, the side teeth 73 are in a contracted state.
The embodiment also discloses a detection method adopting the foundation bearing capacity detection device, which specifically comprises the following steps:
placing a base 1 at a place to be measured, and supporting a ground pile component joint of the base 1 through a supporting device; the support means are used to provide temporary support to the foundation 1, typically to the sleeve 11, prior to installation of the pile assembly 7. The supporting device can adopt a jack or a common thread transmission structure.
Driving the ground pile component 7 to a preset depth through the ground pile driving component 8, enabling the side teeth 73 to be in an extending state, and enabling the overturning piece 6 to be in an everting state; the foundation 1 is connected to all the ground pile assemblies 7 with the foundation 1 horizontal.
The support device is adjusted to enable the ground pile component 7 to generate upward tension F, the range of the tension F is equal to 10% -30% of the maximum tension range which can be borne by the ground pile component 7, and excessive pulling-up of the ground pile component 7 is avoided.
Driving the dowel bar 4 to rotate by rotating a driving piece, such as an electric drill and the like, and drilling the dowel bar 4 to a preset depth; since the dowel bar 4 can axially extend and retract inside the clamping block 52, after the spiral bearing plate 41 is screwed into the ground surface to a certain depth, only the driving tooth 514 needs to be driven continuously. Inserting the oil cylinder 23 into the notch 22, and connecting the power output end of the oil cylinder 23 with the uppermost end of the dowel bar 4; fixing the magnetic meter seat 3 on the middle bracket 5, and contacting the triggering end of the dial indicator with the test disc 42;
starting the oil cylinder 23, testing according to the test rule, reading the data of the force sensor on the dowel bar 4 and the displacement of the dial indicator, and recording; finally the support means are released and the pile assembly 7 is pulled out by the pile driving assembly 8.
Compared with the prior art, the ground pile of the embodiment does not need a plurality of people to rotate, and the ground pile assembly 7 can be driven to be inserted or pulled out only by driving the crankshaft 83 to rotate through the electric drill. The pile driving assembly 8 simultaneously takes the pulling and inserting functions into consideration, and can drive the side teeth 73 and the overturning pieces 6 to act, so that the labor is greatly saved.
In the inserting process of the ground pile component 7, the side teeth 73 are in a contraction state, the surrounding original soil cannot be damaged, and when the side teeth 73 extend out, the ground grabbing force can be greatly improved.
After ground stake subassembly 7 is accomplished the fixed of base 1, base 1 still upwards stimulates certain distance through strutting arrangement to ground stake subassembly 7, and this distance makes earth have certain, and decurrent pretension to ground stake subassembly 7, is carrying out the in-process that the bearing capacity detected like this, and base 1 is fixed by strutting arrangement and ground stake subassembly 7 simultaneously in upper and lower direction, and overall structure is very stable, has guaranteed the measuring accuracy.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. Foundation bearing capacity detection device, its characterized in that: the pile foundation comprises a base (1) and at least three ground pile assemblies (7) for fixing the base (1), wherein a middle support (5) and an upper support (2) are sequentially arranged above the base (1), the upper support (2) is provided with a transversely-movable oil cylinder (23), and a power output end of the oil cylinder (23) is provided with a detachable dowel bar (4);
the dowel bar (4) is sequentially provided with a test disc (42), a force sensor and a spiral bearing plate (41) from top to bottom;
the middle support (5) is provided with a rotary driving piece for driving the dowel bar (4) to rotate, and the rotary driving piece is detachably connected with the dowel bar (4).
2. The foundation footing bearing capacity detection device of claim 1, wherein: the cross section of the dowel bar (4) is a regular polygon;
the rotary driving piece comprises a driving disc (51) and clamping blocks (52), the driving disc (51) is rotatably connected to the middle support (5), at least two clamping blocks (52) are arranged, and when the clamping blocks (52) are clamped on the outer surface of the dowel bar (4) and placed in the driving disc (51), the clamping blocks (52) and the dowel bar (4) can synchronously rotate;
a face tooth (513) is arranged below the driving disc (51), and the face tooth (513) is driven by a driving tooth (514) arranged on the base (1).
3. The foundation footing bearing capacity detection device of claim 1, wherein: the base (1) is connected with the ground pile component (7) through a fixed sleeve (72), the side part of the fixed sleeve (72) is provided with a fixed sleeve articulated shaft (721), the fixed sleeve articulated shaft (721) is articulated with a base connecting shaft (722) which is perpendicular to the fixed sleeve articulated shaft (721), and the base (1) is sleeved on the base connecting shaft (722) through a sleeve (11).
4. The foundation footing bearing capacity detection device of claim 1, wherein: the ground pile assembly (7) comprises a ground pile body (71), telescopic side teeth (73) are arranged on the side portion of the ground pile body (71), a foldable overturning part (6) is arranged at the bottom of the ground pile assembly (7), and the side teeth (73) and the overturning part (6) are driven by a guide part (76);
when the ground pile component (7) is in a use state, the side teeth (73) are in an extending state, and the overturning part (6) is in an everting state;
when the ground pile assembly (7) is in a plugging state, the side teeth (73) are in a contraction state, and the overturning piece (6) is in an inward folding state.
5. The foundation footing bearing capacity detection device of claim 4, wherein: a driving pin (731) is arranged on the side part of the inner end of the side tooth (73), a guide groove matched with the driving pin (731) is formed in the guide piece (76), and a lower driving end (74) is arranged at the bottom of the guide piece (76);
when the ground pile component (7) is in a use state, the driving pin (731) is located at the upper end of the guide groove, the lower driving end (74) is connected with the turnover piece (6), and the turnover piece (6) is in an eversion state;
when the ground pile assembly (7) is in a plugging state, the driving pin (731) is positioned at the lower end of the guide groove.
6. The foundation footing bearing capacity detection device of claim 5, wherein: the guide groove comprises a chute (761) and a vertical groove (762) which are connected in sequence from top to bottom, when the driving pin (731) is positioned at the uppermost end of the vertical groove (762), the lower driving end (74) enables the turnover piece (6) to be in an eversion state, and the side teeth (73) are in a contraction state.
7. The foundation footing bearing capacity detection device of claim 4, wherein: the ground pile is characterized in that the ground pile body (71) is internally connected with side teeth (73) through side tooth mounting grooves (77), the side teeth (73) respectively extend and retract from two opposite surfaces of the ground pile body (71), and the guide pieces (76) are arranged in gaps between the side tooth mounting grooves (77) and the inner surface of the ground pile body (71).
8. The foundation footing bearing capacity detecting device of claim 5, 6 or 7, wherein: the pile driving mechanism is characterized by further comprising a pile driving assembly (8), wherein the pile driving assembly (8) comprises an inserting sleeve (81) and a crankshaft mounting sleeve (82) capable of moving axially relative to the inserting sleeve (81), the crankshaft mounting sleeve (82) is provided with a crankshaft (83), and the crankshaft (83) is connected with a pendulum bob (85) capable of sliding axially along the inserting sleeve (81) through a connecting rod (84);
an upper impact block (811) is arranged in the plug bush (81);
the connecting rod (84) drives the pendulum bob (85) to move upwards and downwards through two springs (841) respectively;
when the crankshaft mounting sleeve (82) moves to a relatively higher position, the crankshaft (83) drives the pendulum bob (85) to impact the impact block (811), and the pendulum bob (85) does not extend out of the lower end of the plug bush (81);
when the crankshaft mounting sleeve (82) moves to a relatively lower position, the crankshaft (83) drives the pendulum bob (85) to extend out of the lower end of the insert sleeve (81), and the pendulum bob (85) does not impact the upper impact block (811).
9. The foundation footing bearing capacity detection device of claim 8, wherein: the inserting sleeve (81) is connected with the guide piece (76) through a connecting block (75), and the connecting block (75) is arranged on a limiting long hole (712) on the side part of the ground pile body (71);
when the connecting block (75) moves to the bottommost part of the limiting long hole (712), the side teeth (73) are in an extending state, and the overturning piece (6) is in an everting state;
when the connecting block (75) moves to the uppermost end of the limiting long hole (712), the side teeth (73) are in a contracted state.
10. The detection method of the foundation bearing capacity detection device adopts the foundation bearing capacity detection device of claim 9, and is characterized in that: comprises the following steps:
placing a base (1) at a place to be measured, and supporting a ground pile component joint of the base (1) through a supporting device;
driving the ground pile assembly (7) to a preset depth through the ground pile driving assembly (8), enabling the side teeth (73) to be in an extending state, and enabling the overturning piece (6) to be in an everting state;
connecting the base (1) to all the ground pile assemblies (7) and enabling the base (1) to be in a horizontal state;
adjusting the supporting device to enable the ground pile component (7) to generate upward tensile force F, wherein the range of the tensile force F is equal to 10% -30% of the maximum tensile force range which can be borne by the ground pile component (7);
the dowel bar (4) is driven to rotate by the rotary driving piece, and the dowel bar (4) is driven to drill to a preset depth;
inserting the oil cylinder (23) into the notch (22), and connecting the power output end of the oil cylinder (23) with the uppermost end of the dowel bar (4);
fixing the magnetic meter base (3) on the middle bracket (5), and contacting the trigger end of the dial indicator with the test disc (42);
starting the oil cylinder (23), testing according to the test rule, reading the data of the force sensor on the dowel bar (4) and the displacement of the dial indicator, and recording;
the support device is loosened, and the ground pile assembly (7) is pulled out through the ground pile driving assembly (8).
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