CN113931454A - Secondary locking structure of pressure-bearing type prestressed anchor rod and technological process thereof - Google Patents
Secondary locking structure of pressure-bearing type prestressed anchor rod and technological process thereof Download PDFInfo
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- CN113931454A CN113931454A CN202110513816.4A CN202110513816A CN113931454A CN 113931454 A CN113931454 A CN 113931454A CN 202110513816 A CN202110513816 A CN 202110513816A CN 113931454 A CN113931454 A CN 113931454A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004873 anchoring Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005260 corrosion Methods 0.000 claims abstract description 4
- 239000004519 grease Substances 0.000 claims description 19
- 238000009434 installation Methods 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000012423 maintenance Methods 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000006378 damage Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 239000011083 cement mortar Substances 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 239000004922 lacquer Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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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
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
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- Geochemistry & Mineralogy (AREA)
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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a secondary locking structure of a pressure-bearing type prestressed anchor rod, which is characterized in that: the anchor rod comprises an anchoring body, a prefabricated cushion block and an anchor rod, wherein the bottom of the anchor rod is connected with the anchoring body together and provided with a bearing plate, the anchor rod is positioned above the prefabricated cushion block and connected with a prestressed locking plate, and the top of the anchor rod is connected with an anchor plate matched with an anchor bar. Compared with the prior art, the invention has the advantages that: the structure creates conditions for primary locking by additionally arranging the prefabricated cushion block at the bottom of the cushion layer, and in the process of pouring the water-resistant plate, secondary locking is realized by the embedded anchor bars and the anchor plate matched with the anchor bars, so that the state of the compression stress of an anchor body is achieved, the problem that the prestress cannot be applied is solved, meanwhile, stress diffusion is carried out through the prefabricated cushion block, the compression area is increased, the compressive stress of a substrate is reduced, and the problem of insufficient stratum bearing capacity is solved; the anchor head and the locking plate are protected from corrosion by the prefabricated cushion block and the foundation cushion layer, so that the requirement on durability is met.
Description
Technical Field
The invention relates to the technical field, in particular to a secondary locking structure of a pressure-bearing type prestressed anchor rod and a process flow thereof.
Background
Along with the shortage of urban land resources, in order to meet the functional requirements of buildings, the development and utilization depth of underground spaces is further increased, and five-six-storey basement buildings are increased day by day, so that the anti-floating problem of the basements is increasingly highlighted, and the anti-floating requirement is higher and higher due to the increase of the excavation depth, so that the anti-pulling force required to be provided by the anti-floating anchor rod is larger.
According to the technical Standard of anti-floating engineering (JGJ-2019) No. 7.1.11 and No. 7.5.8, the grade of the anti-floating anchor rod is that the first-grade engineering should not generate tensile stress, the second-grade engineering tensile stress should not be greater than the axial tensile strength of an anchoring body, and the third-grade engineering should be controlled according to the allowance of crack generation.
For satisfying the standard requirement, guarantee anti-floating anchor rod quality, the anchor body problem of pulling has been solved to pressure-bearing type prestressed anchorage pole, but the prestressing force is applyed the problem and is also produced by fortune, how solve the prestressing force and apply the problem, also become the key of anti-floating anchor rod construction, because the basement bottom plate needs monolithic pouring, if reserve the hole after stretch-draw anchor, the construction difficulty is great, the time limit for a project is longer, and cause great influence to the wholeness of water-resisting board, and anchor two main difficult problems lie in on the ground body among the prior art: (1) insufficient bearing capacity: the substrate bearing layer is generally made of cohesive soil or sand and pebbles, the bearing capacity is small, and the bearing capacity is insufficient due to the application of large prestress; (2) insufficient durability: if the steel backing plate is directly anchored on the bearing layer, the anchor head and the locking plate are directly contacted with underground water, and the durability is difficult to ensure.
Disclosure of Invention
The invention aims to solve the technical problems of insufficient bearing capacity and insufficient durability in the conventional structure proposed in the background art, and provides a secondary locking structure of a pressure-bearing type prestressed anchor rod and a process flow thereof, wherein the secondary locking structure can solve the problems of insufficient bearing capacity and insufficient durability.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the utility model provides a bearing type prestressed anchorage pole secondary locking structure, it includes the anchor body and locates the prefabricated cushion at anchor body top, anchor body and prefabricated cushion connect jointly between two parties and be equipped with the stock, the stock run through the setting of prefabricated cushion, the stock including locate inboard anchor bar and locate the outside and cup joint and be equipped with anticorrosive sleeve pipe, stock bottom be connected with the anchor body jointly and be equipped with the bearing plate, the stock be located prefabricated cushion top and connect and be equipped with the prestressing force lockplate, the stock on connect and be equipped with the prestressing force locking anchor head that is used for stabilizing the prestressing force lockplate, prefabricated cushion top connect and be equipped with the bed course, the anchor bar top connect and be equipped with the supporting anchor plate of anchor bar, the supporting anchor plate top of anchor bar connect and be equipped with the supporting anchor head of second anchor bar that is used for stabilizing the supporting anchor plate of anchor bar.
Furthermore, the outer side of the anchor bar is brushed with a plurality of layers of anticorrosive paint, and anticorrosive grease is injected between the anchor bar and the anticorrosive sleeve, so that the anchor bar can be subjected to further anticorrosive measures.
Further, stock bottom connect and be equipped with the fixed seal ring of cooperation bearing plate, bearing plate bottom connect and be equipped with the supporting anchor head of the first anchor muscle that is used for stabilizing the bearing plate, can seal inside the stock and stabilize the bearing plate.
Furthermore, the top of the cushion layer is connected with a water-resistant plate, and the anchor bars penetrate through the water-resistant plate to achieve the water-resistant and water-proof effects on the whole mechanism.
The process flow comprises the following steps: measuring hole → forming hole → manufacturing rod body → installing rod body → pressure grouting → secondary grouting → quality self-checking and maintenance → installing prefabricated cushion block and filling grease → applying prestress primary locking → installing anchor plate and secondary locking → constructing foundation.
The operation process and the technical requirements are as follows:
the first step is as follows: the pore is measured.
The second step is that: and (4) forming holes, namely forming the holes by a hidden hole drilling hole forming process according to stratum conditions.
The third step: cleaning holes in time after the holes are formed, and cleaning the holes by adopting high-pressure air to blow out sediments in the holes.
The fourth step: the body of rod preparation, according to the required preparation stock of design, main work contains brush anticorrosive lacquer, bearing plate installation, fixed seal ring and anticorrosive sleeve pipe installation.
The fifth step: and (3) installing a rod body, after drilling and cleaning, putting the manufactured anchor rod body and the grouting pipe into a hole, requiring the designed depth to be within an error of 10cm, and then injecting anticorrosive grease into the anticorrosive sleeve.
And a sixth step: and (3) manufacturing a grouting anchor body, performing pressure grouting through a grouting pipe, performing grouting by using M35 high-strength cement mortar or pure cement slurry, wherein the cement mark is P.O42.5, the grouting pressure is 0.5-3.0 MPa, the grouting is required to be performed for the first time until the slurry returns to the ground, and the grouting is performed for the second time when the slurry in a hole is lower than 10cm of the ground at an interval of about 5 minutes until the slurry is stable, wherein multiple times of slurry supplement are required if necessary until the slurry is stable.
The seventh step: quality inspection and maintenance: and after the second grouting is finished for 30min, checking the grout surface and the anchor bar, if the grouting is abnormal, immediately correcting, if the anchor bar is abnormal, finishing the construction of the anchor bar, and entering a maintenance stage.
Eighth step: installing a prefabricated cushion block and filling grease: the maintenance connects stage can carry out prefabricated section installation and grease filling work in step, and prefabricated cushion size can compromise bearing capacity and die-cut destruction according to the bearing capacity size of holding power layer and stock axial force size, calculates the prefabricated cushion size of adjustment to accomplish prefabricated work in advance, after the installation of prefabricated cushion, it is full to adopt the grease to fill the clearance between the body of rod and anticorrosive sleeve pipe.
The ninth step: applying prestress for primary locking: after the strength of the anchoring body reaches the design strength, a prestress locking plate is installed, prestress is applied by tensioning, a high-strength finish-rolled screw-thread steel nut prestress locking anchor head matched with the diameter of the anchor bar is adopted for locking, and the locking prestress is not smaller than the design axial force of the anchor rod.
The tenth step: and (3) secondary locking of anchor plate installation: the end part of the anchor rod is provided with an anchor plate and an anchor head which are matched according to the design requirement, and the anchor head is a high-strength finish-rolled screw-thread steel nut.
The eleventh step: and (5) constructing a foundation.
After adopting the structure, the invention has the following advantages: the structure creates conditions for primary locking by additionally arranging the prefabricated cushion block at the bottom of the cushion layer, and in the process of pouring the water-resistant plate, secondary locking is realized by the embedded anchor bars and the anchor plate matched with the anchor bars, so that the state of the compression stress of an anchor body is achieved, the problem that the prestress cannot be applied is solved, meanwhile, stress diffusion is carried out through the prefabricated cushion block, the compression area is increased, the compressive stress of a substrate is reduced, and the problem of insufficient stratum bearing capacity is solved; the prefabricated cushion block is isolated from the foundation cushion layer, so that the anchor head and the locking plate are protected from corrosion, and the requirement on durability is met; the method is convenient and fast to construct, bearing capacity and punching damage can be considered according to the bearing capacity of the bearing layer and the axial force of the anchor rod during the hole forming of the anchor rod, the size of the cushion block is calculated and adjusted, prefabrication can be completed in advance, the whole construction period is not delayed, prestress application is realized through the structure, the elastic deformation of the steel bar is released in advance, and the adverse effect on a basement bottom plate caused by the large elastic deformation of the steel bar in the later operation stage of the traditional pressure type anchor rod can be well solved.
Drawings
FIG. 1 is a schematic overall structure diagram of a secondary locking structure of a pressure-bearing prestressed anchor rod according to the present invention.
Fig. 2 is a top sectional structural view of a portion a in fig. 1.
FIG. 3 is a schematic view of a top-down structure of a prefabricated cushion block of a secondary locking structure of a pressure-bearing prestressed anchor rod according to the present invention
As shown in the figure: 1. anchor body, 2, prefabricated cushion block, 3, stock, 4, dowel, 5, anticorrosive paint, 6, anticorrosive grease, 7, anticorrosive sleeve pipe, 8, bearing plate, 9, fixed seal ring, 10, the supporting anchor head of first dowel, 11, bed course, 12, prestressing force lockplate, 13, prestressing force locking anchor head, 14, water-resistant board, 15, the supporting anchor plate of dowel, 16, the supporting anchor head of second dowel.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the present invention, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore are not to be construed as limiting the present invention, and further, the terms "first", "second", etc., are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, and thus, the features defined as "first", "second", etc., may explicitly or implicitly include one or more such features.
In the description of the present invention, it should be noted that the term "connected" is to be understood broadly, for example, it may be a fixed connection, a detachable connection, or an integral connection, unless otherwise explicitly specified or limited, and those skilled in the art can understand the specific meaning of the above terms in the present invention in a specific case.
The present invention will be described in further detail with reference to the accompanying drawings.
With reference to the attached drawings 1-3, a secondary locking structure of a pressure-bearing type prestressed anchor rod comprises an anchor body 1 and a prefabricated cushion block 2 arranged at the top of the anchor body 1, the anchoring body 1 and the prefabricated cushion block 2 are connected with an anchor rod 3 in the middle, the anchor rod 3 is arranged through the prefabricated cushion block 2, the anchor rod 3 comprises an anchor bar 4 arranged at the inner side and an anti-corrosion sleeve 7 sleeved at the outer side, the bottom of the anchor rod 3 is connected with the anchoring body 1 together and is provided with a bearing plate 8, the anchor rod 3 is positioned above the prefabricated cushion block 2 and is connected with a prestressed locking plate 12, the anchor rod 3 is connected with a prestress locking anchor head 13 for stabilizing a prestress locking plate 12, the top of the prefabricated cushion block 2 is connected with a cushion layer 11, the top of the anchor bar 4 is connected with an anchor plate 15 matched with the anchor bar, the top of the anchor bar matched anchor plate 15 is connected with a second anchor bar matched anchor head 16 for stabilizing the anchor bar matched anchor plate 15.
4 outside brushes of dowel steel have multilayer anticorrosive paint 5, dowel steel 4 and anticorrosive sleeve pipe 7 between annotate anticorrosive grease 6, 3 bottoms of stock connect and be equipped with the stationary seal ring 9 of cooperation bearing plate 8, 8 bottoms of bearing plate connect and be equipped with the supporting anchor head 10 of first dowel steel that is used for stabilizing bearing plate 8, 12 tops of bed course connect and be equipped with water-resistant board 14, dowel steel 4 run through water-resistant board 14 and set up.
The process flow comprises the following steps: measuring hole → forming hole → manufacturing rod body → installing rod body → pressure grouting → secondary grouting → quality self-checking and maintenance → installing prefabricated cushion block and filling grease → applying prestress primary locking → installing anchor plate and secondary locking → constructing foundation.
The operation process and the technical requirements are as follows:
the first step is as follows: the pore is measured.
The second step is that: and (4) forming holes, namely forming the holes by a hidden hole drilling hole forming process according to stratum conditions, wherein the hole depth and the hole diameter meet design requirements and the hole forming depth is recorded in time.
The third step: cleaning holes in time after the holes are formed, and cleaning the holes by adopting high-pressure air to blow out sediments in the holes.
The fourth step: the body of rod preparation, according to the required preparation stock of design, main work contains brush anticorrosive lacquer, bearing plate installation, fixed seal ring and anticorrosive sleeve pipe installation.
The fifth step: and (3) installing a rod body, after drilling and cleaning, putting the manufactured anchor rod body and the grouting pipe into a hole, requiring the designed depth to be within an error of 10cm, and then injecting anticorrosive grease into the anticorrosive sleeve.
And a sixth step: grouting anchor body manufacture, performing pressure grouting through a grouting pipe, performing grouting by using M35 high-strength cement mortar or pure cement slurry, wherein the cement mark is P.O42.5, the grouting pressure is 0.5-3.0 MPa, the grouting is required to be performed for the first time until the slurry returns to the ground, observing about 5 minutes, and performing secondary pressure compensation grouting when the slurry in a hole is lower than 10cm of the ground until the slurry is stable, and performing repeated grouting if necessary until the slurry is stable, wherein when the high-strength grouting body is mainly used for preventing prestress application, the pressure stress of an anchor plate is overlarge, crushing the anchor body, and the strength of the grouting body can be checked and adjusted according to the size of the anchor force and the size of the anchor plate.
The seventh step: quality inspection and maintenance: and after the second grouting is finished for 30min, checking the grout surface and the anchor bar, if the grouting is abnormal, immediately correcting, if the anchor bar is abnormal, finishing the construction of the anchor bar, and entering a maintenance stage.
Eighth step: installing a prefabricated cushion block and filling grease: the maintenance connects stage can carry out prefabricated section installation and grease filling work in step, and prefabricated cushion size can compromise bearing capacity and die-cut destruction according to the bearing capacity size of holding power layer and stock axial force size, calculates the prefabricated cushion size of adjustment to accomplish prefabricated work in advance, after the installation of prefabricated cushion is accomplished, fill full with the adoption grease of the body of rod and anticorrosive casing intervalve clearance, thereby form the secondary to the body of rod material and be anticorrosive.
The ninth step: applying prestress for primary locking: after the strength of an anchoring body reaches the design strength, a prestressed locking plate is installed, prestress is applied by tensioning, a high-strength finish-rolled screw-thread steel nut prestressed locking anchor head matched with the diameter of an anchor bar is adopted for locking, the locking prestress is not smaller than the design axial force of the anchor bar, and after the prestressed locking plate is installed and fixed, a foundation cushion needs to be laid on the top of the structure.
The tenth step: and (3) secondary locking of anchor plate installation: the end part of the anchor rod is provided with an anchor plate and an anchor head which are matched according to the design requirement, and the anchor head is a high-strength finish-rolled screw-thread steel nut.
The eleventh step: and (3) foundation construction, namely construction of the water-resistant plate 14 layer and subsequent laying construction.
The present invention and its embodiments have been described above, but the description is not limitative, and the actual structure is not limited thereto. It should be understood that those skilled in the art should understand that they can easily make various changes, substitutions and alterations herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides a pressure-bearing type prestressed anchorage pole secondary locking structure which characterized in that: it comprises an anchoring body (1) and a prefabricated cushion block (2) arranged at the top of the anchoring body (1), wherein the anchoring body (1) and the prefabricated cushion block (2) are connected together in the middle to form an anchor rod (3), the anchor rod (3) penetrates through the prefabricated cushion block (2) to be arranged, the anchor rod (3) comprises an anchor bar (4) arranged on the inner side and an anti-corrosion sleeve (7) sleeved on the outer side, the bottom of the anchor rod (3) is connected with the anchoring body (1) together to form a bearing plate (8), the anchor rod (3) is arranged above the prefabricated cushion block (2) to be connected with a prestressed locking plate (12), the anchor rod (3) is connected with a prestressed locking anchor head (13) used for stabilizing the prestressed locking plate (12), the top of the prefabricated cushion block (2) is connected with a cushion layer (11), the top of the anchor bar (4) is connected with an anchor plate (15) matched with the anchor bar, and a second anchor bar matched anchor head (16) used for stabilizing the anchor bar matched anchor plate (15) is connected to the top of the anchor bar matched anchor plate (15).
2. The secondary locking structure of the pressure-bearing prestressed anchor rod as claimed in claim 1, wherein: the outer side of the anchor bar (4) is brushed with a plurality of layers of anticorrosive paint (5), and anticorrosive grease (6) is injected between the anchor bar (4) and the anticorrosive sleeve (7).
3. The secondary locking structure of the pressure-bearing prestressed anchor rod as claimed in claim 1, wherein: stock (3) bottom connect and be equipped with fixed seal ring (9) of cooperation bearing plate (8), bearing plate (8) bottom connect and be equipped with the supporting anchor head (10) of first anchor bar that is used for stabilizing bearing plate (8).
4. The secondary locking structure of the pressure-bearing prestressed anchor rod as claimed in claim 1, wherein: the top of the cushion layer (12) is connected with a water-resistant plate (14), and the anchor bars (4) penetrate through the water-resistant plate (14).
5. A process flow for adopting the secondary locking structure of the pressure-bearing type prestressed anchor rod as claimed in any one of claims 1 to 4, is characterized in that: the process flow comprises the following steps: measuring hole → hole forming → rod body making → rod body installation → pressure grouting → secondary grouting → quality self-inspection and maintenance → prefabricated cushion block installation, grease filling → prestress application (primary locking) → anchor plate installation (secondary locking) → foundation construction.
The operation process and the technical requirements are as follows:
the first step is as follows: the pore is measured.
The second step is that: and (4) forming holes, namely forming the holes by a hidden hole drilling hole forming process according to stratum conditions.
The third step: cleaning holes in time after the holes are formed, and cleaning the holes by adopting high-pressure air to blow out sediments in the holes.
The fourth step: the body of rod preparation, according to the required preparation stock of design, main work contains brush anticorrosive lacquer, bearing plate installation, fixed seal ring and anticorrosive sleeve pipe installation.
The fifth step: and (3) installing a rod body, after drilling and cleaning, putting the manufactured anchor rod body and the grouting pipe into a hole, requiring the designed depth to be within an error of 10cm, and then injecting anticorrosive grease into the anticorrosive sleeve.
And a sixth step: grouting (manufacturing an anchoring body), performing pressure grouting through a grouting pipe, performing grouting by using M35 high-strength cement mortar or pure cement slurry, wherein the cement mark is P.O42.5, the grouting pressure is 0.5-3.0 MPa, the grouting is required to be performed for the first time until the slurry returns to the ground, observing about 5 minutes, and performing secondary pressure compensation grouting when the slurry in a hole is 10cm lower than the ground until the slurry is stable, and performing repeated slurry compensation if necessary until the slurry is stable.
The seventh step: quality inspection and maintenance: and after the second grouting is finished for 30min, checking the grout surface and the anchor bar, if the grouting is abnormal, immediately correcting, if the anchor bar is abnormal, finishing the construction of the anchor bar, and entering a maintenance stage.
Eighth step: installing a prefabricated cushion block and filling grease: the maintenance connects stage can carry out prefabricated section installation and grease filling work in step, and prefabricated cushion size can compromise bearing capacity and die-cut destruction according to the bearing capacity size of holding power layer and stock axial force size, calculates the prefabricated cushion size of adjustment to accomplish prefabricated work in advance, after the installation of prefabricated cushion, it is full to adopt the grease to fill the clearance between the body of rod and anticorrosive sleeve pipe.
The ninth step: prestressing (primary locking): after the strength of the anchoring body reaches the designed strength, a prestressed locking plate is installed, prestress is applied by tensioning, a high-strength finish-rolled deformed steel bar nut (a prestressed locking anchor head) matched with the diameter of the anchor bar is used for locking, and the locking prestress is not smaller than the designed axial force of the anchor rod.
The tenth step: anchor plate installation (secondary locking): the end part of the anchor rod is provided with an anchor plate and an anchor head which are matched according to the design requirement, and the anchor head is a high-strength finish-rolled screw-thread steel nut.
The eleventh step: and (5) constructing a foundation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110513816.4A CN113931454A (en) | 2021-05-12 | 2021-05-12 | Secondary locking structure of pressure-bearing type prestressed anchor rod and technological process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110513816.4A CN113931454A (en) | 2021-05-12 | 2021-05-12 | Secondary locking structure of pressure-bearing type prestressed anchor rod and technological process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404859A (en) * | 2022-08-12 | 2022-11-29 | 中建八局第一建设有限公司 | Novel pressure type prestress anti-floating anchor rod and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404859A (en) * | 2022-08-12 | 2022-11-29 | 中建八局第一建设有限公司 | Novel pressure type prestress anti-floating anchor rod and construction method thereof |
| CN115404859B (en) * | 2022-08-12 | 2023-07-11 | 中建八局第一建设有限公司 | Novel pressure type prestress anti-floating anchor rod and construction method thereof |
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