CN210712973U - Anti-pulling test device of stock - Google Patents
Anti-pulling test device of stock Download PDFInfo
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- CN210712973U CN210712973U CN201921063592.6U CN201921063592U CN210712973U CN 210712973 U CN210712973 U CN 210712973U CN 201921063592 U CN201921063592 U CN 201921063592U CN 210712973 U CN210712973 U CN 210712973U
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Abstract
An uplift test device for an anchor rod comprises a reaction layer, a longitudinal reaction beam, a transverse reaction beam, a jack, a first base plate, a reference beam and a displacement meter which are sequentially arranged from bottom to top; the reaction layer is arranged in the cushion layer on the opposite side of the anchor rod; the longitudinal counter-force beam is arranged on the counter-force layer at the opposite side of the anchor rod; the transverse counter-force beam is transversely arranged on the top of the longitudinal counter-force beam on the opposite side of the anchor rod; the jack is arranged on the transverse counter-force beams on the two sides of the anchor rod; the first base plate pad is arranged between the top of the jack and the anchorage device; the reference beam is arranged on the cushion layer on one side of the anchor rod; displacement monitoring points are arranged on the reference beam at intervals; a horizontal supporting plate is arranged on the outer side of the anchor rod and between the transverse reaction beam and the cushion layer; the displacement meter is placed on the supporting plate and used for detecting the relative vertical displacement of the supporting plate and the reference beam. The utility model provides a traditional detection device cause the ground body to destroy easily and test result distortion and the technical problem of the length of extracting of unable fine control stock.
Description
Technical Field
The utility model relates to a detection device, especially an anti-pulling test device of stock.
Background
Construction scale of a certain project: planning 27633 square meters of total land use, 195373 square meters of total building area, 3 layers of basement, 65940 square meters of building area, 15m of maximum excavation depth of foundation pit and 99.95m of maximum building height; when the foundation pit is supported, an anchor rod is adopted for supporting. The anchor rod in the project is a permanent anchor rod, the diameter of a hole formed by an anchor hole is 220mm, and the depth of a drilled hole entering a medium-strength weathered rock stratum is required to be more than or equal to 3.0m by a soil layer anchor rod; the length of the soil layer anchor rod is not less than 19m, the drilled hole is required to enter a full-weathered layer, and the anchor rod needs to be lengthened by adopting welding and lapping. In order to determine design parameters such as the ultimate bearing capacity of the anchor rod, a test anchor rod needs to be driven before anchor rod construction is carried out so as to determine parameters such as the ultimate bearing capacity of the anchor rod and a construction process. The existing anchor rod anti-pulling detection device has obvious effect on the pressure stress of the rock and soil mass around the anchor rod, easily causes the damage of the rock and soil mass and the distortion of a test result, and solves the technical problem that the pulling-out length of the anchor rod cannot be well controlled.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an anti-pulling test device of stock will solve traditional detection device and cause the technical problem of the length of extracting of ground body destruction and test result distortion and unable fine control stock easily.
In order to achieve the above purpose, the utility model adopts the following technical scheme.
An anti-pulling test device of an anchor rod is used for carrying out an anti-pulling test on the anchor rod; wherein, a space is reserved between the anchorage device at the upper part of the anchor rod and the cushion layer; the anti-pulling test device comprises a supporting mechanism and a detection mechanism; the support mechanism is arranged between the cushion layer and the anchorage device and comprises a reaction layer, a longitudinal reaction beam, a transverse reaction beam, a jack and a first base plate which are sequentially arranged from bottom to top; the reaction layer is arranged in the cushion layer on the opposite side of the anchor rod; wherein, a space is arranged between the reaction layer on each side and the anchor rod; the longitudinal counter-force beam is correspondingly arranged on the counter-force layer at the opposite side of the anchor rod; the transverse counter-force beam is transversely erected at the top of the longitudinal counter-force beam at the opposite side of the anchor rod, and a through hole penetrating through the anchor rod is formed in the transverse counter-force beam; the two jacks are respectively arranged on the transverse counter-force beams on the two sides of the anchor rod; the first base plate pad is arranged between the top of the jack and the anchorage device; a through hole penetrating through the anchor rod is formed in the plate surface of the first base plate;
the detection mechanism comprises a reference beam and a displacement meter; the reference beam is arranged on the cushion layer on one side of the anchor rod; displacement monitoring points are arranged on the reference beam at intervals; a horizontal supporting plate is arranged on the outer side of the anchor rod and between the transverse reaction beam and the cushion layer; the displacement meter is placed on the supporting plate and used for detecting the relative vertical displacement of the supporting plate and the reference beam.
Preferably, the distance between the anchorage device and the cushion layer is 0.8-1.5 m.
Preferably, the reaction layer is a gravel layer or a concrete layer, and the bearing capacity is not less than 250 kPa; the top surface of the reaction layer is flush with the top surface of the cushion layer, the thickness of the reaction layer is not less than 300mm, and the length of the reaction layer is 1.2-1.8 m; the width of the reaction layer is 1.5 m-2.5 m.
Preferably, the distance between the center of the anchor rod and the end of the transverse reaction beam is greater than or equal to 2 times the width of the transverse reaction beam and greater than 2.0 m.
Preferably, an oil pump is further arranged on the cushion layer; the oil pump is respectively connected with the two jacks to provide power for jacking the jacks.
Compared with the prior art, the utility model has the following characteristics and beneficial effect.
1. The bottom of the longitudinal counter-force beam is provided with the second base plate, and the bottom of the second base plate is provided with the counter-force layer; the design method improves the bearing capacity of the uplift test device, the anchor rod uplift detection device has obvious effect on the compressive stress of the rock and soil mass around the anchor rod, the rock and soil mass is easy to damage, the test result is easy to distort, and the accuracy of the test result is influenced.
2. The utility model arranges a horizontal supporting plate outside the anchor rod; and place the displacement table in the backup pad for detect the relative vertical displacement of backup pad and benchmark roof beam, and utilize the oil pump to provide power for resistance to plucking test stake, when the length of pulling out reaches regulation length, close the oil pump promptly, thereby the length of pulling out of fine control stock.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the anti-pulling test device of the present invention.
Fig. 2 is a schematic structural view of the vertical reaction beam of the present invention.
Fig. 3 is a schematic structural diagram of the first pad of the present invention.
Reference numerals: 1-anchor rod, 2-anchorage device, 3-cushion layer, 4-reaction layer, 5-longitudinal reaction beam, 6-transverse reaction beam, 7-jack, 8-first backing plate, 9-perforation, 10-through hole, 11-reference beam, 12-displacement meter, 13-oil pump, 14-supporting plate and 15-second backing plate.
Detailed Description
As shown in fig. 1-3, the anti-pulling test device for the anchor rod is used for carrying out anti-pulling test on the anchor rod 1; wherein, a space is reserved between the anchorage device 2 at the upper part of the anchor rod 1 and the cushion layer 3; the anti-pulling test device comprises a supporting mechanism and a detection mechanism; the supporting mechanism is arranged between the cushion layer 3 and the anchorage device 2 and comprises a reaction layer 4, a longitudinal reaction beam 5, a transverse reaction beam 6, a jack 7 and a first base plate 8 which are arranged in sequence from bottom to top; the reaction layer 4 is arranged in the cushion layer 3 on the opposite side of the anchor rod 1; wherein, a space is arranged between the counter force layer 4 on each side and the anchor rod 1; the longitudinal counter-force beam 5 is correspondingly arranged on the counter-force layer 4 on the opposite side of the anchor rod 1; the transverse reaction beam 6 is transversely erected on the top of the longitudinal reaction beam 5 on the opposite side of the anchor rod 1, and a through hole 9 penetrating through the anchor rod 1 is formed in the transverse reaction beam 6; two jacks 7 are arranged on the transverse counter-force beams 6 on the two sides of the anchor rod 1 respectively; the first base plate 8 is arranged between the top of the jack 7 and the anchorage device 2 in a padded mode; a through hole 10 penetrating through the anchor rod 1 is formed in the plate surface of the first backing plate 8;
the detection mechanism comprises a reference beam 11 and a displacement meter 12; the reference beam 11 is arranged on the cushion layer 3 on one side of the anchor rod 1 and is positioned between the anchor rod 1 and the longitudinal counter-force beam 5; displacement monitoring points are arranged on the reference beam 11 at intervals; a horizontal supporting plate 14 is arranged on the outer side of the anchor rod 1 and between the transverse reaction beam 6 and the cushion layer 3; the displacement gauge 12 is placed on the support plate 14 to detect the relative vertical displacement of the support plate 14 and the reference beam 11.
In this embodiment, the distance between the anchorage device 2 and the cushion layer 3 is 0.8m to 1.5 m.
In this embodiment, the reaction layer 4 is a crushed stone layer, and the bearing capacity should not be less than 250 kPa; the top surface of the reaction layer 4 is flush with the top surface of the cushion layer 3, the thickness of the reaction layer 4 is not less than 300mm, and the length of the reaction layer 4 is 1.2-1.8 m; the width of the reaction layer 4 is 1.5 m-2.5 m.
In this embodiment, a second cushion plate 15 is interposed between the longitudinal reaction force beam 5 and the cushion layer 3.
In this embodiment, the top surface of the reaction layer 4 is flat and has no groove, and is flush with the top surface of the cushion layer 3.
Of course, in other embodiments, the reaction layer 4 may also be a concrete layer.
In this embodiment, the distance between the center of the anchor rod 1 and the end of the transverse reaction beam 6 should be greater than or equal to twice the width of the transverse reaction beam 6 and greater than 2.0 m.
In this embodiment, an oil pump 13 is further disposed on the cushion layer 3; the oil pump 13 is respectively connected with the two jacks 7 to provide power for the jacks 7.
In this embodiment, the longitudinal reaction beams 5 are steel pads, and the transverse reaction beams 6 are steel beams.
In the embodiment, the anchor rod 1 is a permanent anchor rod, the anchor bars with the diameter of 4 phi 28 (HRB 400) are spot-welded into bundles, the spot-welding into bundles, and the anchor bars are welded and lapped when needing to be lengthened; the diameter of the anchor hole is 220mm, and the depth of the drill hole of the soil layer anchor rod entering the medium-strength weathering rock stratum is more than or equal to 3.0 m; and the drill hole of the soil layer anchor rod with the length not less than 19m enters the full weathered layer.
In the embodiment, the cement poured into the cementing material in the drill hole is ordinary portland cement, the cement label is 42.5R, the primary grouting material is M30 cement paste, the water cement ratio is preferably 0.45-0.5, and the water in the cement paste is tap water.
In the embodiment, 3 anchor rods used for a test are made in the geological drilling machine hole forming process before the anchor rod 1 is formally constructed; adjusting the design and construction of the anchor rod 1 according to the test data; 235 anchor rods (calculated by 5%) are collected after construction.
In this embodiment, the pullout test of the anchor rod 1 should be performed after the grout of the anchoring section reaches the design strength.
The experimental requirements in this example are: during the test, the anchor rod 1 is separated from the cushion layer 3 and is in an independent stress state; the examined anchor rod 1 should be kept vertical, and the height of the part of the anchor rod 1 above the ground is about 1.2 meters, so that the reaction force device can be installed.
In this embodiment, the distance from the end of the transverse reaction beam 6 to the center of the anchor rod 1 should be greater than or equal to 2B (B is the width of the transverse reaction beam 6) and greater than 2.0m, and the bearing capacity of the foundation below the second bolster 15 is not less than 250 kPa. During detection, the anchor rod 1 needs to be separated from the cushion layer 3 and is in an independent stress state.
Loading requirements: the loading is preferably as designed: and (3) carrying out primary loading with 0.1Afptk, and then 1/10-1/15 Afptk, and carrying out cyclic loading in sequence until the initial loading reaches 0.8fptk or the cyclic loading is damaged.
The above embodiments are not exhaustive of the specific embodiments, and other embodiments are possible, and the above embodiments are intended to illustrate, but not limit the scope of the present invention, and all applications coming from the simple changes of the present invention fall within the scope of the present invention.
Claims (5)
1. An anti-pulling test device of an anchor rod is used for carrying out an anti-pulling test on the anchor rod (1); a space is reserved between the anchorage device (2) at the upper part of the anchor rod (1) and the cushion layer (3); the method is characterized in that: the anti-pulling test device comprises a supporting mechanism and a detection mechanism; the supporting mechanism is arranged between the cushion layer (3) and the anchorage device (2), and comprises a reaction layer (4), a longitudinal reaction beam (5), a transverse reaction beam (6), a jack (7) and a first base plate (8) which are arranged from bottom to top in sequence; the reaction layer (4) is arranged in the cushion layer (3) on the opposite side of the anchor rod (1); a space is arranged between the reaction layer (4) on each side and the anchor rod (1); the longitudinal counter-force beam (5) is correspondingly arranged on the counter-force layer (4) on the opposite side of the anchor rod (1); the transverse reaction beam (6) is transversely erected at the top of the longitudinal reaction beam (5) at the opposite side of the anchor rod (1), and a through hole (9) penetrating through the anchor rod (1) is formed in the transverse reaction beam (6); two jacks (7) are arranged on the transverse counter-force beams (6) on two sides of the anchor rod (1) respectively; the first base plate (8) is arranged between the top of the jack (7) and the anchorage device (2) in a padded mode; a through hole (10) penetrating through the anchor rod (1) is formed in the plate surface of the first backing plate (8);
the detection mechanism comprises a reference beam (11) and a displacement meter (12); the reference beam (11) is arranged on the cushion layer (3) on one side of the anchor rod (1); displacement monitoring points are arranged on the reference beam (11) at intervals; a horizontal support plate (14) is arranged on the outer side of the anchor rod (1) and between the transverse reaction beam (6) and the cushion layer (3); the displacement meter (12) is placed on the support plate (14) and used for detecting the relative vertical displacement of the support plate (14) and the reference beam (11).
2. The uplift test device of the anchor rod according to claim 1, wherein: the distance between the anchorage device (2) and the cushion layer (3) is 0.8-1.5 m.
3. The uplift test device of the anchor rod according to claim 1, wherein: the reaction layer (4) is a gravel layer or a concrete layer, and the bearing capacity is not less than 250 kPa; the top surface of the reaction layer (4) is flush with the top surface of the cushion layer (3), the thickness of the reaction layer (4) is not less than 300mm, and the length of the reaction layer (4) is 1.2-1.8 m; the width of the reaction layer (4) is 1.5-2.5 m.
4. The uplift test device of the anchor rod according to claim 1, wherein: the distance between the center of the anchor rod (1) and the end part of the transverse reaction beam (6) is more than or equal to 2 times of the width of the transverse reaction beam (6) and is more than 2.0 m.
5. The uplift test device of the anchor rod according to claim 1, wherein: an oil pump (13) is also arranged on the cushion layer (3); the oil pump (13) is respectively connected with the two jacks (7) to provide power for jacking the jacks (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921063592.6U CN210712973U (en) | 2019-07-09 | 2019-07-09 | Anti-pulling test device of stock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921063592.6U CN210712973U (en) | 2019-07-09 | 2019-07-09 | Anti-pulling test device of stock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210712973U true CN210712973U (en) | 2020-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921063592.6U Active CN210712973U (en) | 2019-07-09 | 2019-07-09 | Anti-pulling test device of stock |
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| Country | Link |
|---|---|
| CN (1) | CN210712973U (en) |
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2019
- 2019-07-09 CN CN201921063592.6U patent/CN210712973U/en active Active
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