CN209741942U - Prestressing force counter-force girder steel structure for pile foundation static load test - Google Patents
Prestressing force counter-force girder steel structure for pile foundation static load test Download PDFInfo
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- CN209741942U CN209741942U CN201920278668.0U CN201920278668U CN209741942U CN 209741942 U CN209741942 U CN 209741942U CN 201920278668 U CN201920278668 U CN 201920278668U CN 209741942 U CN209741942 U CN 209741942U
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- steel
- box girder
- steel box
- reinforcing bar
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 141
- 239000010959 steel Substances 0.000 title claims abstract description 141
- 230000003068 static effect Effects 0.000 title claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 47
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 16
- 238000005452 bending Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
The utility model discloses a pile foundation is prestressing force counter-force girder steel structure for static load test relates to the technical field that the pile foundation detected, aims at solving prior art and compresses the steel box girder through steel strand wires both ends receive prestressing force, and steel strand wires receive the easy fracture or plastic deformation behind the pulling force of heavy load for a long time, and then influence life's problem, and it includes the steel box girder, be equipped with in the steel box girder and wear to establish the chamber, wear to establish the intracavity edge the reinforcing bar is worn to be equipped with by the length direction of steel box girder, the reinforcing bar in the middle of upwards preflex and form the arch, steel box girder both ends are equipped with and wear to establish the hole, wear out through wearing to establish the hole at the reinforcing bar both ends the steel box girder to connecting the retaining member in the end of wearing to be equipped with the levelling device of reinforcing bar alignment in the middle of the steel box. The utility model has the advantages of improve the bearing capacity of steel case roof beam and improve device life under the condition that does not increase steel.
Description
Technical Field
The utility model belongs to the technical field of the technique that the pile foundation detected and specifically relates to a pile foundation is prestressing force counter-force girder steel structure for static load test is related to.
Background
The static load test of the pile foundation refers to a test method which respectively applies axial pressure and axial uplift force on the pile top step by step or applies horizontal force at the position where the elevation of the bottom surface of a pile foundation bearing platform is consistent according to the using function of the pile, observes the settlement, uplift displacement or horizontal displacement of corresponding detection points of the pile along with time, and judges the corresponding vertical compression bearing capacity of a single pile, the vertical uplift bearing capacity of the single pile or the horizontal bearing capacity of the single pile according to the relation (namely Q-S curve) of load and displacement.
notice No. is CN 202482902U's utility model discloses a pile foundation is prestressing force counter-force girder steel for static load test has buried the steel pipe underground in the steel box girder, wears a plurality of steel strand wires in the steel pipe, and it wraps up steel strand wires to have grout to inject in the steel pipe, respectively sets up an anchorage device and pins steel strand wires fixedly on the steel strand wires of steel box girder both ends head.
The device is stretched by stretching the steel strand to achieve controlled stress and then is released. In the releasing and tensioning process, the prestressed steel strands are locked through the prestressed anchorage device, so that the section of the steel box girder is subjected to internal pressure, the crack resistance and the deformation performance of the structure are improved, and the tensile stress of the prestressed steel strands and the compressive stress in the steel box girder form a self-balancing system in the period. Therefore, the bearing capacity of the steel box girder can be improved without increasing the steel material.
However, in the above prior art scheme, the steel box girder is compressed by the prestress at the two ends of the steel strand, and the force is reflected on the steel strand after the steel box girder receives the upward jacking force, so that the two ends of the steel strand continue to receive the tensile force, and the steel strand is easy to break or plastically deform after being subjected to the tensile force of a large load for a long time, thereby affecting the service life.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a pile foundation is prestressing force counter-force girder steel structure for static load test, it has the bearing capacity that improves the steel case roof beam under the condition that does not increase steel and improves device life's advantage.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
The utility model provides a pile foundation is prestressing force counter-force girder steel structure for static load test, includes the steel box girder, be equipped with in the steel box girder and wear to establish the chamber, wear to establish the intracavity edge the reinforcing bar is worn to be equipped with by the length direction of steel box girder, the reinforcing bar in the middle of upwards pre-bending and form the arch, steel box girder both ends are equipped with and wear to establish the hole, wear out through wearing to establish the hole reinforcing bar both ends the steel box girder to wear out the retaining member in the end of wearing out, be equipped with the levelling device with the reinforcing bar alignment in the middle of the steel box girder.
Through adopting above-mentioned technical scheme, the steel box girder is when using, at first force the reinforcing bar through levelling device and straighten, at the in-process that the reinforcing bar becomes straight, the reinforcing bar both ends are outwards stretched out from wearing to establish the hole gradually, treat after the reinforcing bar basic alignment, use the retaining member respectively to lock the reinforcing bar at the both ends that the reinforcing bar was worn out the steel box girder, later make levelling device off-load again, at this moment, the reinforcing bar can produce the resilience force that becomes the pre-bending shape, and under the effect of resilience force, extrude the both ends of steel box girder through the retaining member, make the cross-section of steel box girder receive certain internal pressure, thereby improve the anti crack resistance and the deformability of steel box girder, a self-balancing system is constituteed to the resilience force of reinforcing bar and the internal pressure in the steel box girder during. Therefore, the bearing capacity of the steel box girder can be improved under the condition that steel is not increased, and meanwhile, the service life of the steel bar and the steel box girder is longer because the steel bar in the structure is subjected to bending force rather than pressure in the test process.
The utility model discloses further set up to: the leveling device comprises a hydraulic cylinder arranged at the top of the outer side of the steel box girder, a piston rod of the hydraulic cylinder vertically extends downwards, the end part of the piston rod of the hydraulic cylinder is fixedly connected with a top block, and the top block corresponds to the upper part of the steel bar.
Through adopting above-mentioned technical scheme, when the pneumatic cylinder started, the piston rod outwards stretched out, and the kicking block of piston rod tip compresses tightly the reinforcing bar downwards to make the crookedness of reinforcing bar diminish until the basic alignment of reinforcing bar, the piston rod of control pneumatic cylinder is motionless this moment, treats that the retaining member hugs closely the both ends of steel box girder and starts the pneumatic cylinder again after locking the reinforcing bar and make the piston rod withdraw, thereby reaches the purpose of leveling the reinforcing bar temporarily.
The utility model discloses further set up to: the cross-section of the reinforcing steel bar is rectangular with chamfers, and the longer sides of the rectangle are the upper side and the lower side of the reinforcing steel bar.
By adopting the technical scheme, the rectangular section of the reinforcing steel bar has a certain guiding function, so that the reinforcing steel bar can not rotate along the circumferential direction of the reinforcing steel bar in the process of drawing along the through hole, the pre-bending direction of the reinforcing steel bar is ensured to be always upward,
The utility model discloses further set up to: wear to establish the chamber and be equipped with many places side by side along the width direction of steel case roof beam, every wears to establish and separates through vertical baffle between the chamber, and every wears to establish all corresponding reinforcing bar that is equipped with in the chamber, each wears to establish in the chamber the prebending radian of reinforcing bar is the same and all is located same height.
Through adopting above-mentioned technical scheme, the baffle can further form spacing effect to the reinforcing bar, prevents that the reinforcing bar from taking place the upset after the effort that receives the pneumatic cylinder to make the reinforcing bar can't carry out the atress in the direction of predetermineeing.
The utility model discloses further set up to: the locking piece is a flat anchor.
By adopting the technical scheme, the distribution of the locking hole positions of the flat anchorage device is the same as the arrangement of the through holes in the structure, and the locking hole positions are linearly distributed, so that the flat anchorage device is suitable for locking the reinforcing steel bars in the structure.
The utility model discloses further set up to: the middle position of the lower end of the top block is provided with a rectangular clamping groove matched with the radian of the section of the upper half part of the reinforcing steel bar.
Through adopting above-mentioned technical scheme, the direction of reinforcing bar can further be restricted to the rectangle draw-in groove, avoids the reinforcing bar to take place to rotate, also can make the contact position of kicking block and reinforcing bar be in the centre of kicking block all the time simultaneously, avoids the kicking block to exert oneself inequality and takes place distortion and damage.
The utility model discloses further set up to: and a fixed middle frame is arranged in the middle of the bottom of the steel box girder.
Through adopting above-mentioned technical scheme, well center frame is used for fixing a position the intermediate position of steel box girder to make the centre of steel box girder is located to the top that the pile foundation that awaits measuring can be quick among the measurement process, guarantee the middle atress of steel box girder, thereby make steel box girder both ends atress balanced.
The utility model discloses further set up to: and a plurality of groups of symmetrical grooves are symmetrically arranged on the steel box girder by taking the center of the fixed middle frame as a reference.
through adopting above-mentioned technical scheme, the symmetry groove makes the pier that supports in steel box girder both ends below can be quick find the symmetrical position on the steel box girder length direction, further guarantees when guaranteeing test efficiency that steel box girder both ends atress is balanced.
To sum up, the utility model discloses a beneficial technological effect does:
1. The steel box girder is characterized in that pre-bent reinforcing steel bars are arranged in the steel box girder, a straightening device is used for straightening the reinforcing steel bars, and a locking piece is used for locking the reinforcing steel bars, so that the reinforcing steel bars extrude the steel box girder from two ends under the action of resilience force, the anti-cracking performance and the deformation performance of the steel box girder are improved, and the bearing capacity of the steel box girder is improved under the condition that steel is not increased;
2. Through set up on the steel box girder and decide center and symmetry groove, made things convenient for the quick alignment of pile foundation and the symmetry mound that awaits measuring, guaranteed test efficiency when having guaranteed that the stress at steel box girder both ends is balanced in the experimentation.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a sectional view a-a in fig. 1.
Fig. 3 is a sectional view B-B in fig. 1.
In the figure, 1, a steel box girder; 2. reinforcing steel bars; 3. a flat anchor; 4. the cavity is penetrated; 5. a partition plate; 6. perforating holes; 7. a leveling device; 71. a hydraulic cylinder; 72. a top block; 73. a card slot; 8. a middle frame is determined; 9. a symmetrical groove.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
referring to fig. 1, fig. 2, for the utility model discloses a pile foundation is prestressing force counter-force girder steel structure for static load test, including steel box girder 1, keep apart into a plurality of wearing to establish chamber 4 through baffle 5 in the steel box girder 1, wear to establish chamber 4 and set up side by side along the width direction of steel box girder 1, the utility model discloses wearing to establish chamber 4 and being 4 in this embodiment, every department wears to establish all corresponding reinforcing bar 2 that is equipped with in the chamber 4, the cross-section of reinforcing bar 2 is for having the rectangle of chamfer and the longer limit of rectangle be the higher authority and the lower level of reinforcing bar 2, and the reinforcing bar 2 middle preflex makes progress and forms the arch, and 1 both ends of steel box girder are equipped with wearing to establish hole 6, and 2 both ends of reinforcing bar wear out steel box girder 1 through wearing to establish hole 6 to connect the retaining member in the end of wearing to, the retaining. And a leveling device 7 for straightening the reinforcing steel bars 2 is arranged in the middle of the steel box girder 1.
when the steel box girder 1 is used, firstly, the steel bar 2 is forced to be straightened through the leveling device 7, in the straightening process of the steel bar 2, two ends of the steel bar 2 gradually extend out of the through holes 6, after the steel bar 2 is basically straightened, the two ends of the steel bar 2 penetrating out of the steel box girder 1 are respectively locked by the flat anchors 3, then the leveling device 7 is unloaded, at the moment, the steel bar 2 can generate resilience force changing to a pre-bending shape, and under the action of the resilience force, two ends of the steel box girder 1 are extruded through the locking pieces, so that the cross section of the steel box girder 1 is subjected to certain internal pressure, the anti-cracking performance and the deformation performance of the steel box girder 1 are improved, a self-balancing system is formed by the resilience force of the steel bar 2 and the internal pressure in the steel box girder 1, and therefore, the bearing capacity of the steel box girder 1 can be improved under the condition of not increasing steel.
Referring to fig. 2, fig. 3, leveling device 7 is including locating the pneumatic cylinder 71 at the top of the 1 outside of steel box girder, the piston rod of pneumatic cylinder 71 is vertical to be stretched out downwards, 4 kicking blocks 72 of the piston rod end fixedly connected with of pneumatic cylinder 71, 4 kicking blocks 72 set up corresponding to each reinforcing bar 2 top of wearing to establish in the chamber 4 respectively, the lower extreme intermediate position of kicking block 72 is equipped with the draw-in groove 73 with the rectangle that the first half cross-section radian of reinforcing bar 2 conformed to, rectangle draw-in groove 73 can further restrict the direction of reinforcing bar 2, avoid reinforcing bar 2 to rotate, also can make kicking block 72 and reinforcing bar 2's contact position be in the centre of kicking block 72 all the time simultaneously, avoid kicking block 72 with uneven and take place distortion and damage.
When the hydraulic cylinder 71 is started, the piston rod is ejected downwards, the ejector block 72 at the end part of the piston rod downwards compresses the steel bar 2, the bending degree of the steel bar 2 is gradually reduced until the steel bar 2 is basically straightened, the piston rod of the hydraulic cylinder 71 is controlled to be kept still at the moment, the hydraulic cylinder 71 is started to retract the piston rod after the flat anchorage device 3 is tightly attached to two ends of the steel box girder 1 to lock the steel bar 2, and therefore the purposes of temporarily leveling the steel bar 2 and keeping the steel bar in a straight state are achieved.
It should be noted that: the pre-bending radian of the reinforcing steel bars 2 in the penetrating cavities 4 is the same and the reinforcing steel bars are positioned at the same height. When this setting can guarantee that the piston rod of pneumatic cylinder 71 is vertical to be stretched out downwards, each reinforcing bar 2 can all be unanimous by the size of atress and atress simultaneously to it is the same to the reaction force of piston rod, and then guarantees that the atress of piston rod lower extreme is even, avoids the piston rod to take place to twist reverse, thereby damages pneumatic cylinder 71.
Referring to fig. 1 and 2, in order to ensure that the two ends of the steel box girder 1 are stressed evenly and the service life of the steel box girder 1 is prolonged while the test efficiency is ensured, a centering frame 8 is arranged in the middle of the bottom of the steel box girder 1, and meanwhile, a plurality of groups of symmetrical grooves 9 are symmetrically arranged on the steel box girder 1 by taking the center of the centering frame 8 as a reference.
This setting has guaranteed that the centre of steel box girder 1 is located in the top that the pile foundation that awaits measuring can be quick, guarantees that steel box girder 1 receives jack-up force in the middle of being positive, and supports the mound and can be quick the ascending symmetric position of alignment steel box girder 1 length direction for 1 both ends atress of steel box girder is balanced, thereby prolongs steel box girder 1's life.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. The utility model provides a pile foundation is prestressing force reaction girder steel structure for static load test, includes steel box girder (1), its characterized in that: be equipped with in steel box girder (1) and wear to establish chamber (4), wear to establish and follow in chamber (4) reinforcing bar (2) are worn to be equipped with by the length direction of steel box girder (1), upwards the preflex and form the arch in the middle of reinforcing bar (2), steel box girder (1) both ends are equipped with and wear to establish hole (6), wear out through wearing to establish hole (6) reinforcing bar (2) both ends steel box girder (1) to connecting the retaining member in the end of wearing out, be equipped with leveling device (7) with reinforcing bar (2) alignment in the middle of steel box girder (1).
2. The prestressed reaction steel girder structure for the static load test of the pile foundation of claim 1, which is characterized in that: levelling device (7) are including locating hydraulic cylinder (71) at steel box girder (1) outside top, the piston rod of hydraulic cylinder (71) is vertical stretches out downwards, piston rod tip fixed connection kicking block (72) of hydraulic cylinder (71), kicking block (72) correspond to reinforcing bar (2) top sets up.
3. The prestressed reaction steel girder structure for the pile foundation static load test according to claim 2, characterized in that: the cross section of the steel bar (2) is rectangular with chamfers, and the longer sides of the rectangle are the upper side and the lower side of the steel bar (2).
4. The prestressed reaction steel girder structure for the pile foundation static load test according to claim 3, characterized in that: wear to establish chamber (4) and be equipped with many places side by side along the width direction of steel case roof beam (1), every department wears to establish and separates through vertical baffle (5) between chamber (4), and every department wears to establish all corresponding being equipped with reinforcing bar (2) in chamber (4), in each wears to establish chamber (4) the preflex radian of reinforcing bar (2) is the same and all is located same height.
5. The prestressed reaction steel girder structure for the pile foundation static load test according to claim 3, characterized in that: the locking piece is a flat anchor (3).
6. The prestressed reaction steel girder structure for the pile foundation static load test according to claim 3, characterized in that: the middle position of the lower end of the top block (72) is provided with a rectangular clamping groove (73) which is matched with the radian of the section of the upper half part of the steel bar (2).
7. The prestressed reaction steel girder structure for the static load test of the pile foundation of claim 1, which is characterized in that: and a fixed middle frame (8) is arranged in the middle of the bottom of the steel box girder (1).
8. The prestressed reaction steel girder structure for the static load test of the pile foundation of claim 7, wherein: and a plurality of groups of symmetrical grooves (9) are symmetrically arranged on the steel box girder (1) by taking the center of the fixed middle frame (8) as a reference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920278668.0U CN209741942U (en) | 2019-03-04 | 2019-03-04 | Prestressing force counter-force girder steel structure for pile foundation static load test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920278668.0U CN209741942U (en) | 2019-03-04 | 2019-03-04 | Prestressing force counter-force girder steel structure for pile foundation static load test |
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| Publication Number | Publication Date |
|---|---|
| CN209741942U true CN209741942U (en) | 2019-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920278668.0U Expired - Fee Related CN209741942U (en) | 2019-03-04 | 2019-03-04 | Prestressing force counter-force girder steel structure for pile foundation static load test |
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| Country | Link |
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| CN (1) | CN209741942U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117071732A (en) * | 2023-10-11 | 2023-11-17 | 湖南大学 | Self-resetting high-ductility assembled frame structure |
| CN117432011A (en) * | 2023-10-31 | 2024-01-23 | 慈溪市诚正建设工程检测有限公司 | Pile foundation anti-pulling capability detection device |
-
2019
- 2019-03-04 CN CN201920278668.0U patent/CN209741942U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117071732A (en) * | 2023-10-11 | 2023-11-17 | 湖南大学 | Self-resetting high-ductility assembled frame structure |
| CN117432011A (en) * | 2023-10-31 | 2024-01-23 | 慈溪市诚正建设工程检测有限公司 | Pile foundation anti-pulling capability detection device |
| CN117432011B (en) * | 2023-10-31 | 2024-03-29 | 慈溪市诚正建设工程检测有限公司 | Pile foundation anti-pulling capability detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191206 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |