CN114000547A - Anti-floating anchor rod structure and construction method thereof - Google Patents
Anti-floating anchor rod structure and construction method thereof Download PDFInfo
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- CN114000547A CN114000547A CN202111437961.5A CN202111437961A CN114000547A CN 114000547 A CN114000547 A CN 114000547A CN 202111437961 A CN202111437961 A CN 202111437961A CN 114000547 A CN114000547 A CN 114000547A
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- 238000007667 floating Methods 0.000 title claims abstract description 70
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 48
- 239000010959 steel Substances 0.000 claims description 48
- 238000004873 anchoring Methods 0.000 claims description 37
- 230000001681 protective effect Effects 0.000 claims description 31
- 238000013461 design Methods 0.000 claims description 22
- 230000008878 coupling Effects 0.000 claims description 21
- 238000010168 coupling process Methods 0.000 claims description 21
- 238000005859 coupling reaction Methods 0.000 claims description 21
- 238000005553 drilling Methods 0.000 claims description 11
- 239000011440 grout Substances 0.000 claims description 11
- 239000004519 grease Substances 0.000 claims description 10
- 238000005260 corrosion Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 claims 4
- 238000004891 communication Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000001050 lubricating effect Effects 0.000 description 7
- 210000002435 tendon Anatomy 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides an anti-floating anchor rod structure and a construction method thereof, and relates to the technical field of anti-floating of constructional engineering. The anti-floating anchor rod structure and the construction method thereof can meet the crack control requirement of anti-floating engineering on the anti-floating anchor rod.
Description
Technical Field
The invention relates to the technical field of anti-floating of constructional engineering, in particular to an anti-floating anchor rod structure and a construction method thereof.
Background
The anti-floating anchor rod is one kind of anti-floating measure for underground structure in building engineering, and is one structural member set to resist the upward shift of the building.
For the anti-floating engineering with the anti-floating engineering design grade of A and B, when the anti-floating anchor rod is adopted as an anti-floating measure, the crack control design of the anchoring body of the anti-floating anchor rod is in accordance with the following steps: in the engineering with the anti-floating design grade of A, the anchoring slurry body can not generate tensile stress under the standard combination of load effect; in the engineering with the anti-floating design grade of B grade, the tensile stress in the anchoring slurry body under the standard combination of the load effect is not greater than the axial tensile strength of the anchoring slurry body.
The existing tension type anti-floating anchor rod can not meet the crack control requirements of the first-level and second-level anti-floating projects on the anti-floating anchor rod.
In view of the above, the inventor designs an anti-floating anchor rod structure and a construction method thereof through repeated experiments according to production design experiences in the field and related fields for many years, so as to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide an anti-floating anchor rod structure and a construction method thereof, which are used for meeting the crack control requirement of anti-floating engineering on an anti-floating anchor rod.
In order to achieve the above object, the present invention provides an anti-floating anchor rod structure, wherein the anti-floating anchor rod structure includes a grouting body and an anchor rod body, the anchor rod body is embedded in the grouting body, the anchor rod body at least includes a prestressed threaded steel bar, a bearing plate and an anchoring part, the prestressed threaded steel bar and the grouting body are coaxially disposed, the bearing plate is fixedly connected to one end of the prestressed threaded steel bar, one end of the anchoring part is fixedly connected to the bearing plate, and the other end of the anchoring part is anchored in the grouting body.
The anti-floating anchor rod structure comprises an anchor rod body and a pre-stressed threaded steel bar, wherein the anchor rod body further comprises a connecting nut, one end of the pre-stressed threaded steel bar penetrates through the bearing plate and the connecting nut and is in threaded connection with the connecting nut, and the connecting nut and the bearing plate are in threaded spot welding connection.
The anti-floating anchor rod structure is characterized in that the anchoring component is arranged on one surface, opposite to the connecting nut, of the bearing plate.
The anti-floating anchor rod structure comprises an anchoring part and a bearing plate, wherein the anchoring part comprises a plurality of anchor bars which are parallel to the prestressed threaded steel bars, the anchor bars are uniformly distributed along the circumferential direction of the bearing plate, and one end of each anchor bar is welded on the bearing plate.
The anti-floating anchor rod structure as described above, wherein the outside of the coupling nut and the outside of the bearing plate are respectively coated with an anti-corrosion coating.
The anti-floating anchor rod structure comprises an anchor rod body and a protective cover, wherein the protective cover covers the connecting nut and is fixedly connected with the bearing plate.
As above anti-floating anchor rod structure, wherein, the stock body of rod still includes protective sleeve, protective sleeve locates the bearing plate dorsad one side and the cover of coupling nut are established outside the prestressing force twisted steel, protective sleeve's tip with the bearing plate is sealed to be cooperated, protective sleeve with it has anticorrosive lubricating grease to fill between the prestressing force twisted steel.
The anti-floating anchor rod structure comprises an anchor rod body and is characterized by further comprising a plurality of centering supports, wherein the centering supports are sequentially arranged along the length direction of the prestressed threaded steel bar at intervals, each centering support is sleeved outside the protective sleeve and fixedly connected with the protective sleeve, and two clamping grooves used for clamping a grouting pipe are formed in each centering support.
The anti-floating anchor rod structure is characterized in that the other end of the prestressed twisted steel bar protrudes out of the grouting body and is fixed in a building foundation through the anchoring assembly.
The invention also provides a construction method of the anti-floating anchor rod structure, which is used for installing the anti-floating anchor rod structure, wherein the construction method of the anti-floating anchor rod structure comprises the following steps:
step 1, manufacturing the anchor rod body and assembling the anchor rod body into a whole;
step 2, digging the building foundation pit to the foundation bottom elevation required by the design, and paving a foundation cushion;
step 3, positioning the positions of the drill holes on the basic cushion layer according to design requirements and drilling down at the positioning positions to form the drill holes;
step 4, the anchor rod body is put into the drill hole, grouting is conducted into the drill hole to form the grouting body, and an over-grouting part is formed at the top of the grouting body;
step 5, processing the over-injection part and the foundation pad layer;
and 6, applying prestress to the anchor rod body and fixing the top end of the anchor rod body in the foundation cushion layer.
Compared with the prior art, the invention has the following characteristics and advantages:
according to the anti-floating anchor rod structure and the construction method, the bearing plate is provided with the anchoring part, and the anchoring part is anchored in the grouting body and bears the weight of the bearing plate and the prestressed threaded steel bar, so that the body of the anchor rod is prevented from generating tensile stress due to the weight, and the crack control requirement of the anti-floating anchor rod is met.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.
Fig. 1 is a schematic structural view of an anti-floating anchor rod according to the present invention;
FIG. 2 is a schematic view illustrating a top treatment of a grouting body of the anti-floating anchor rod according to the present invention;
FIG. 3 is a schematic structural view of a waterproof structure at a contact part of an anti-floating anchor rod and a foundation in the invention;
FIG. 4 is a schematic sectional view taken along line A-A of FIG. 1;
fig. 5 is a schematic structural elevation view of a bearing plate of the anti-floating anchor rod according to the present invention;
fig. 6 is a schematic plan view showing the construction of a bearing plate of the anti-floating anchor rod according to the present invention.
Description of reference numerals:
100. an anti-floating anchor rod; 10. Grouting;
11. a supernote portion; 20. An anchor rod body;
21. prestressed twisted steel; 22. A pressure bearing plate;
23. an anchor member; 231. Anchoring ribs;
232. the anchor bars are centered;
24. a connecting nut; 25. A protective cover;
26. a protective sleeve; 27. Centering the bracket;
30. an anchor assembly; 31. A pre-stressed anchor;
32. a steel backing plate; 33. A water stop ring;
34. an anchoring plate; 35. A nut anchor;
200. a base mat layer; 300. Drilling;
400. a foundation; 500. Leveling layer;
600. a waterproof coating.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.
As shown in fig. 1 to 6, the present invention provides an anti-floating anchor rod structure 100, the anti-floating anchor rod structure 100 includes a grout 10 and an anchor rod body 20, the anchor rod body 20 is embedded in the grout 10, the anchor rod body 20 at least includes a prestressed threaded steel bar 21, a bearing plate 22 and an anchoring part 23, the prestressed threaded steel bar 21 and the grout 10 are coaxially disposed, the bearing plate 22 is fixedly connected to one end of the prestressed threaded steel bar 21, one end of the anchoring part 23 is fixedly connected to the bearing plate 22, and the other end of the anchoring part 23 is anchored in the grout 10.
The invention also provides a construction method of the anti-floating anchor rod structure, which is used for installing the anti-floating anchor rod structure 100, and the construction method comprises the following steps:
step 1, manufacturing an anchor rod body 20 and assembling the anchor rod body 20 into a whole;
step 2, digging the building foundation pit to the foundation bottom elevation required by the design, and paving a foundation cushion layer 200;
step 3, positioning the drilling position according to the design requirement and drilling at the positioning position to form a drilling hole 300;
step 4, the anchor rod body 20 is lowered into the drill hole 300, grouting is conducted into the drill hole 300 to form grouting body 10, and an over-grouting portion 11 is formed at the top of the grouting body 10;
step 5, processing the over-injection part 11 and the foundation pad layer 200;
step 6, prestress is applied to the anchor rods 20 and the top ends of the anchor rods 20 are fixed in the foundation mat 200.
According to the anti-floating anchor rod structure 100 and the construction method, the bearing plate 22 is provided with the anchoring part 23, the anchoring part 23 is anchored in the grouting body 10 and bears the weight of the bearing plate 22 and the prestressed threaded steel bar 21, so that the anchor rod body 20 cannot generate tensile stress due to the weight, and the crack control requirement of the anti-floating anchor rod is met.
In the present invention, the prestressed twisted steel 21 should conform to the relevant regulations of "twisted steel for prestressed concrete" GB/T20065, and the pressure-bearing plate 22 should conform to the relevant regulations of "Low alloy high Strength Steel" GB/T1591.
In an alternative embodiment of the present invention, the grade and diameter of the prestressed rebar 21 should be determined by calculation according to the maximum loading value of the single anti-floating anchor bearing capacity acceptance test or the basic test.
In an alternative embodiment of the present invention, the diameter and length of the grout 10 should be calculated according to the pulling resistance and bearing capacity characteristic value of the single anchor rod, and the bonding strength standard value of the soil layer and the rock layer with the grout.
In an alternative embodiment of the invention, the diameter of the bearing plate 22 is determined by a partial bearing calculation.
In an alternative embodiment of the present invention, the thickness of the bearing plate 22 is not less than the diameter of the prestressed rebar 21.
In an alternative embodiment of the present invention, the anchor rod body 20 further includes a coupling nut 24, one end of the prestressed threaded reinforcing bar 21 penetrates the bearing plate 22 and the coupling nut 24 and is threadedly coupled with the coupling nut 24, and the coupling nut 24 is spot-welded to the bearing plate 22. By adopting the structure, the connecting nut 24 is screwed into the end part of the prestressed threaded steel bar 21 and then is connected with the bearing plate 22 in a spot welding manner, and the weight of the connecting nut 24 is transferred to the anchoring part 23 through the bearing plate 22, so that the prestressed threaded steel bar 21 is prevented from generating tensile stress.
In the present invention, the performance of the coupling nut 24 is in accordance with the relevant provisions of anchorage, clamp and connector for tendons GB/T14370,
in an alternative embodiment of the invention, the coupling nut 24 is defined by a selected prestressed rebar 21.
In an alternative embodiment of the invention, the anchoring means 23 are provided on the side of the pressure plate 22 facing away from the coupling nut 24.
In an alternative example of the present invention, the anchoring part 23 includes a plurality of anchor bars 231 arranged in parallel to the prestressed twisted steel 21, the plurality of anchor bars 231 are uniformly distributed along the circumferential direction of the pressure bearing plate 22, and one end of each anchor bar 231 is welded to the pressure bearing plate 22. With the above-described structure, the plurality of anchor bars 231 are anchored in the grout 10 to bear the weight of the bearing plate 22.
In an alternative embodiment of the present invention, the diameter of the anchor bar 231 is determined according to the design value of the uplift bearing capacity of the single anchor rod, and the length of the anchor bar 231 is not less than 15 times the diameter of the anchor bar 231.
In an alternative embodiment of the present invention, the anchor bars 231 are connected to the pressure bearing plate 22 by using a pressure submerged arc welding.
In an alternative embodiment, a tendon centering frame 232 is further provided on each tendon 231 to facilitate the stable anchoring of the tendon 231 in the grout 10.
In an alternative embodiment of the present invention, the grout 10 is a vertically arranged column, and the bearing plate 22 is horizontally arranged and connected to the bottom end of the prestressed twisted steel 21.
Further, the anchor bar 231 is fixedly disposed on the upper surface of the pressure-bearing plate 22, and the coupling nut 24 is fixedly disposed on the lower surface of the pressure-bearing plate 22.
In an alternative embodiment of the present invention, the end of the prestressed reinforcing bars 21, the coupling nuts 24 and the bearing plate 22 are coated with an anticorrosive outer coating.
In an alternative embodiment of the present invention, the anchor rod body 20 further includes a protective cover 25, and the protective cover 25 is covered outside the coupling nut 24 and is fixedly connected to the pressure bearing plate 22. With the above structure, the protection cover 25 transmits the weight to the anchoring part 23 through the bearing plate 22, preventing the prestressed twisted steel 21 from generating tensile stress.
In an alternative example, the shield 25 is welded around the lower surface of the pressure bearing plate 22.
In an alternative embodiment of the present invention, the anchor rod body 20 further includes a protective sleeve 26, the protective sleeve 26 is disposed on a side of the bearing plate 22 opposite to the connection nut 24 and is sleeved outside the prestressed threaded steel bar 21, an end portion of the protective sleeve 26 is in sealing fit with the bearing plate 22, and an anti-corrosive grease is filled between the protective sleeve 26 and the prestressed threaded steel bar 21. By adopting the structure, the protective sleeve 26 and the anti-corrosion lubricating grease can protect the prestressed threaded steel bar 21, and the service life of the anchor rod body 20 is prolonged; at the same time, the weight of the protective sleeve 26 and the corrosion-resistant grease is transmitted to the anchoring part 23 through the bearing plate 22, also avoiding the tensile stress of the prestressed rebar 21.
In the invention, the anti-corrosive lubricating grease is in accordance with the relevant regulations of 'anti-corrosive lubricating grease for unbonded prestressed tendons' JG/T430, when in installation, the anti-corrosive lubricating grease is coated in the protective sleeve 26, and the protective sleeve 26 with the anti-corrosive lubricating grease is sleeved into the prestressed threaded steel bar 21 from one end without the protective cover 25 to the upper part of the pressure-bearing plate 22 and is sealed.
In an alternative embodiment of the present invention, the anchor rod body 20 further includes a plurality of centering brackets 27, the centering brackets 27 are sequentially disposed at intervals along the length direction of the prestressed twisted steel 21, each pair of centering brackets 27 is sleeved outside the protective sleeve 26 and is fixedly connected with the protective sleeve 26, and each pair of centering brackets 27 is provided with two slots for clamping a grouting pipe. In the subsequent construction process, two grouts are carried out on the drill hole 300, the two clamping grooves are respectively used for installing a primary grouting pipe and a secondary grouting pipe, and the primary grouting pipe and the secondary grouting pipe are respectively clamped into the clamping grooves of the centering bracket 27 and extend to a certain distance above the bearing plate 22.
Preferably, the primary and secondary grouting pipes extend 50mm above the pressure bearing plate 22, respectively.
In an alternative example, a plurality of centering brackets 27 are uniformly fixed outside the protective sleeve 26 at intervals of 1.5 m.
In an alternative embodiment of the present invention, the other end of the prestressed rebar 21 protrudes from the grout 10 and is fixed in the building foundation by the anchor assembly 30.
In an alternative example of the present invention, the anchoring assembly 30 includes a prestressed anchorage 31, a steel shim plate 32, a water stop ring 33, an anchoring plate 34 and a nut anchorage 35, and the other end of the prestressed twisted steel 21 sequentially penetrates through the prestressed anchorage 31, the steel shim plate 32, the water stop ring 33, the anchoring plate 34 and the nut anchorage 35 and is in threaded connection with the nut anchorage 35.
In an alternative example, the prestressed anchorage device 31 is determined by the prestress application value which is not less than 1.5 times of the characteristic value of the uplift bearing capacity of a single anchor rod.
In an alternative example, the anchor plate 34 diameter is determined by a partial pressure bearing calculation and a die cutting calculation.
In an alternative embodiment of the present invention, in step 1, the dimensions of the components of the anchor rod body 20 are determined according to design requirements, and the anchor rod body 20 is assembled.
In an optional embodiment of the present invention, in step 2, according to the design requirement, the foundation pit is dug to the bottom elevation of the foundation 400 according to the design requirement, and the foundation mat 200 is laid.
In an alternative embodiment of the present invention, step 3 comprises:
and 32, positioning and drilling by using a drilling machine, specifically, when the strength of the concrete of the foundation mat 200 meets the design requirement, selecting a proper drilling machine according to the conditions of rock strata and soil layers, straightening, leveling and stabilizing the drilling machine, selecting a drill bit with a proper diameter according to the design requirement, installing the drill bit, drilling 300 holes, wherein the hole depth of the drilled hole 300 is 200mm below the designed hole depth, the allowable deviation of hole positions is +/-50 mm, the allowable deviation of the diameter of the drilled hole 300 is (+10, 0) mm, and the allowable deviation of the verticality of the drilled hole 300 is 1%.
In an alternative embodiment of the present invention, step 4 comprises:
step 41, lowering the anchor rod body 20, specifically, lowering the assembled and manufactured anchor rod body into the drill hole 300, and lowering the pressure bearing plate 15 to the bottom of the hole by 200 mm;
42, primary grouting, specifically, grouting cement slurry with the water cement ratio of 0.5, properly prolonging the bottom grouting time to ensure that the grouting body below the pressure bearing plate 15 is compactly filled, and ensuring that the height of the over-grouting part 19 of the grouting body is not less than the design requirement;
and 43, secondary grouting, specifically, performing secondary high-pressure splitting grouting within 4-6 h of primary grouting, and stabilizing the pressure for 5min when the grouting pressure reaches more than 1.5 MPa.
In an alternative embodiment of the present invention, step 5 comprises:
51, treating the over-injection part 11 of the grouting body 10, specifically, chiseling the over-injection part 11 of the grouting body 10 to the position which is not less than 50mm below the bottom surface elevation of the foundation 400, ensuring that the strength of the top of the grouting body 10 chiseled by the over-injection part 11 meets the design requirement, and injecting grouting materials to form a grouting material leveling layer 500;
step 52, performing waterproof treatment on the joint of the foundation mat layer 200 and the grouting body 10, specifically, brushing cement-based capillary crystalline waterproof paint 600 within the radius of 600mm on the joint of the foundation mat layer 200 and the grouting body 10 by taking the center of the prestressed threaded steel bar 21 as the center of a circle;
in an alternative embodiment of the present invention, step 6 comprises:
step 61, applying prestress, after the strength of the grouting material leveling layer 500 meets the requirement, penetrating the steel backing plate 32 through the prestressed threaded steel bar 21, placing the steel backing plate on the grouting material leveling layer 500, and applying prestress to the prestressed anchorage device 31 according to the prestress value of the design requirement and anchoring;
step 62, adding the water stop rings 33 and the anchor plate 34, installing two water stop rings 33 on the part of the prestressed threaded steel bar 21 extending out of the prestressed anchor device 31, wherein the distance between the two water stop rings 33 is 200mm, the distance between the lower water stop ring 33 and the top of the foundation 400 is 60mm, installing the anchor plate 34 with the spiral hoop and the nut anchor 35, and performing spot welding on the nut anchor 35 and the upper part of the anchor plate 34.
The anti-floating anchor rod structure 100 and the construction method adopt an unbonded prestressed structure consisting of prestressed threaded steel bars 21, protective sleeves 26, anti-corrosion lubricating grease, a bearing plate 22, connecting nuts 24, grouting bodies 10, prestressed anchors 31 and the like, the crack control of the anchoring grouting bodies 10 can meet the standard requirement, the manufacturing is convenient, and the anchor rod is the best choice when the anchor rod is used as an anti-floating measure in the first-level and second-level anti-floating projects.
The anti-floating anchor rod structure 100 and the construction method provided by the invention have the advantages of reliable structural design, definite stress, simple construction, feasibility and good social and economic benefits.
The present invention is not limited to the above embodiments, and in particular, various features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and the features are understood to be applicable to any embodiment except the explicitly opposite descriptions, and are not limited to the described embodiments.
Claims (10)
1. The utility model provides an anti-floating anchor rod structure, a serial communication port, anti-floating anchor rod structure includes the slip casting body and the stock body of rod, the stock body of rod is buried underground in the slip casting is internal, the stock body of rod includes prestressing force twisted steel, bearing plate and anchoring part at least, prestressing force twisted steel with the coaxial setting of slip casting, the bearing plate rigid coupling in prestressing force twisted steel's one end, anchoring part's one end rigid coupling is in on the bearing plate, anchoring part's the other end anchor in the slip casting is internal.
2. An anti-floating anchor rod structure according to claim 1, wherein the anchor rod body further includes a coupling nut, one end of the prestressed twisted steel penetrates the bearing plate and the coupling nut and is threadedly coupled with the coupling nut, and the coupling nut and the bearing plate are threadedly spot-welded.
3. An anti-floating anchor rod structure according to claim 2, wherein the anchoring member is provided on a face of the pressure plate facing away from the coupling nut.
4. An anti-floating anchor rod structure according to claim 3, wherein the anchoring member includes a plurality of anchor bars arranged in parallel with the prestressed twisted steel, the plurality of anchor bars are uniformly distributed along the circumferential direction of the bearing plate, and one end of each of the anchor bars is welded to the bearing plate.
5. An anti-floating anchor rod structure according to claim 2, wherein the outside of the coupling nut and the outside of the bearing plate are coated with an anti-corrosion coating, respectively.
6. An anti-floating anchor rod structure according to claim 2, wherein the anchor rod body further comprises a shield which is covered outside the coupling nut and is fixedly connected with the bearing plate.
7. The anti-floating anchor rod structure according to claim 2, wherein the anchor rod body further comprises a protective sleeve, the protective sleeve is arranged on one side of the bearing plate, which faces away from the connecting nut, and is sleeved outside the prestressed threaded steel bars, the end part of the protective sleeve is in sealing fit with the bearing plate, and anti-corrosion grease is filled between the protective sleeve and the prestressed threaded steel bars.
8. The anti-floating anchor rod structure of claim 7, wherein the anchor rod body further comprises a plurality of centering brackets, the centering brackets are sequentially arranged at intervals along the length direction of the prestressed twisted steel, each centering bracket is sleeved outside the protective sleeve and is fixedly connected with the protective sleeve, and each centering bracket is provided with two clamping grooves for clamping a grouting pipe.
9. An anti-floating anchor rod structure according to claim 1, wherein the other end of the prestressed twisted steel protrudes from the grout and is fixed in the building foundation by an anchoring assembly.
10. A construction method of an anti-floating anchor structure for installing the anti-floating anchor structure according to any one of claims 1 to 9, the construction method of the anti-floating anchor structure comprising:
step 1, manufacturing the anchor rod body and assembling the anchor rod body into a whole;
step 2, digging the building foundation pit to the foundation bottom elevation required by the design, and paving a foundation cushion;
step 3, positioning the positions of the drill holes on the basic cushion layer according to design requirements and drilling down at the positioning positions to form the drill holes;
step 4, the anchor rod body is put into the drill hole, grouting is conducted into the drill hole to form the grouting body, and an over-grouting part is formed at the top of the grouting body;
step 5, processing the over-injection part and the foundation pad layer;
and 6, applying prestress to the anchor rod body and fixing the top end of the anchor rod body in the foundation cushion layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111437961.5A CN114000547A (en) | 2021-11-29 | 2021-11-29 | Anti-floating anchor rod structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111437961.5A CN114000547A (en) | 2021-11-29 | 2021-11-29 | Anti-floating anchor rod structure and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114000547A true CN114000547A (en) | 2022-02-01 |
Family
ID=79930802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111437961.5A Pending CN114000547A (en) | 2021-11-29 | 2021-11-29 | Anti-floating anchor rod structure and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114000547A (en) |
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2021
- 2021-11-29 CN CN202111437961.5A patent/CN114000547A/en active Pending
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