CN105625421A - External anchoring device for non-metal anti-floating anchor rod - Google Patents

External anchoring device for non-metal anti-floating anchor rod Download PDF

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Publication number
CN105625421A
CN105625421A CN201610004754.3A CN201610004754A CN105625421A CN 105625421 A CN105625421 A CN 105625421A CN 201610004754 A CN201610004754 A CN 201610004754A CN 105625421 A CN105625421 A CN 105625421A
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China
Prior art keywords
anchor rod
pile casting
steel pile
rod body
anchoring section
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CN201610004754.3A
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Chinese (zh)
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CN105625421B (en
Inventor
张明义
白晓宇
朱磊
刘涛
王永洪
高强
方翔
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Zhongji Jiurui Geotechnical Engineering Co ltd
Qingdao University of Technology
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Qingdao Jiurui Building Engineering Co ltd
Qingdao University of Technology
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Priority to CN201610004754.3A priority Critical patent/CN105625421B/en
Publication of CN105625421A publication Critical patent/CN105625421A/en
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Publication of CN105625421B publication Critical patent/CN105625421B/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74Means for anchoring structural elements or bulkheads
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/10Protective 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
    • E02D31/12Protective 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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  • 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 belongs to the technical field of anchoring equipment, and relates to an external anchoring device of a non-metal anti-floating anchor rod, wherein an anchor rod body consists of an inner anchoring section and an outer anchoring section, a positioner is arranged on the outer anchoring section and is respectively connected with the anchor rod body and a steel casing, the steel casing is arranged outside the outer anchoring section, and the steel casing, the outer anchoring section of the anchor rod body and the positioner are tightly bonded by cement mortar; the angle iron is welded on the outer wall of the bottom of the steel casing, and the steel casing and the angle iron are fixed on the rock-soil body in a welding mode; the cushion layer is laid on the rock-soil body and is respectively connected with the inner anchoring section and the outer anchoring section; the outer side wall of the steel casing is welded with a water stop steel plate, and the steel casing, the water stop steel plate and the outer anchoring section of the anchor rod body form an integrated structure and are poured in the reinforced concrete bottom plate; the anchor rod is simple in structure, convenient to operate, low in cost, convenient to install and construct, long in service life, large in anchoring force and good in anchoring effect.

Description

The outer anchor of a kind of nonmetal anti-float anchor rod
Technical field
The invention belongs to anchoring device technical field, relate to the outer anchor of a kind of nonmetal anti-float anchor rod, the device that particularly a kind of nonmetal anti-float anchor rod anchors with reinforced concrete floor, foundation adopts the technology of anti-float anchor rod opposing buoyancy force of underground water, solves the anchorage problem of nonmetal anti-float anchor rod and reinforced concrete floor.
Background technology:
The advantages such as it is strong that anti-float anchor rod has ground adaptability, dispersive stress, it is simple to construction, saving construction cost, especially in hard rock soil layer, bearing capacity is big, more advantage. the existing anti-float anchor rod body of rod adopts metal material mostly, after the rock mass soil layer that its embedment is stable, continuity over time, rod body material easily corrodes, affect anchor bar body intensity, and then its anchoring effect is damaged, this phenomenon is especially prominent in the anti-floating on coastal area buildings or structures basis. in the Construction of Urban Rail Traffic such as subway, DC power-supply system the stray electrical current produced, metal material is produced electrochemical corrosion also comparatively serious. therefore, anchor pole Anticorrosion Problems in the earth formation does not fundamentally solve. so when being impermissible for adopting anchor metal, using nonmetallic materials GFRP anchor pole to become optimum selection. under normal circumstances, regular reinforcement anchor pole aperture section reinforcing bar anchors after directly bending in girt strip, for GFRP muscle, its anti-bending strength is not good, bending anchoring can not be carried out at the construction field (site) as reinforced anchor bolt, and the shearing strength of GFRP anchor pole is also far below its tensile strength, according to common strand tapered anchorage, in anchorage zone, fiber bar is produced excessive chucking power, cause the failure by shear of fiber bar, this causes very big difficulty to the outer anchoring (anchoring with reinforced concrete floor) of GFRP anti-float anchor rod, therefore anchor head adopts the anchoring process of regular reinforcement anchor pole. simultaneously as underground structure bottom plate finite thickness, GFRP anchor pole directly anchors in base plate, in fact it could happen that anchorage length is not enough, does not reach predetermined anchoring effect. therefore, seek to design the outer anchor of a kind of nonmetal anti-float anchor rod to be of great practical significance to solve the weak point of anchoring outside GFPR anti-float anchor rod.
Summary of the invention:
It is an object of the invention to the shortcoming overcoming prior art to exist, seeking design provides the outer anchor of nonmetal anti-float anchor rod that a kind of corrosion resistance is good, have enough anchor force, solves an outer anchoring difficult problem for puzzlement engineering circles.
To achieve these goals, the agent structure of the outer anchor of nonmetal anti-float anchor rod of the present invention includes anchor rod body, localizer, steel pile casting, angle bar, steel plate for sealing water, bed course, cement mortar, reinforced concrete floor and Rock And Soil; The anchor rod body of full thread solid construction adopts glass fiber compound material (GFRP) to make, to improve the cohesion between anchor rod body and anchoring body, thus providing enough anchoring frictional force, anchor rod body is made up of grouted part and outer anchoring section two parts, anchor rod body anchoring section inner bending outside is at a right angle, 3-5 times that radius is anchor rod body diameter of arc place, bending place circle; Outer anchoring section is provided with localizer, and localizer is connected with anchor rod body and steel pile casting respectively, plays centering effect when anchor rod body is installed, and makes anchor rod body have enough protective layers; Equipped with steel pile casting outside outer anchoring section, steel pile casting, the outer anchoring section of anchor rod body and localizer adopt cement mortar tight bond; Angle bar is welded on the outer wall bottom steel pile casting, and steel pile casting and angle bar are fixed on Rock And Soil all in a welding manner; Bed course is laid on Rock And Soil, and bed course is connected with grouted part, outer anchoring section respectively; The lateral wall of steel pile casting is welded with steel plate for sealing water, the closely coupled formation integral structure of outer anchoring section of steel pile casting and steel plate for sealing water and anchor rod body, the integral structure of the outer anchoring section composition of steel pile casting, steel plate for sealing water and anchor rod body is built in reinforced concrete floor, it is provided that reach the purpose of waterproof while continuing anchor force.
It is M30 or M32.5 as the strength grade of described cement mortar of the present invention.
Steel pile casting of the present invention is the seamless steel pipe of diameter 146mm, wall thickness 8mm, the outer wall of steel pile casting respectively with reinforced concrete floor and bed course tight bond, inwall and cement mortar tight bond, steel pile casting is arranged on the outer anchoring section of anti-float anchor rod can not only quickly form anti-floating anchor force, moreover it is possible to ensure that anti-float anchor rod is not cut up by horizontal force.
The specifications and models of angle bar of the present invention are 40mm �� 40mm �� 3mm, and length is 30cm, is fixed on bed course by steel pile casting.
Steel plate for sealing water of the present invention adopts thickness to be 4mm, diameter is the circular steel plate of 450mm to make, and middle reserved aperture is the hole of 150mm, closely coupled with the outer wall of steel pile casting by the mode welded, and forms entirety with outer anchoring section, reaches waterproof purpose.
Bed course of the present invention, between grouted part and outer anchoring section, is made up of the C15 plain concrete that thickness is 100mm, plays water proof, draining, antifreeze and improve the effect of anti-float anchor rod working condition.
The present invention realizes the detailed process of anchoring outside nonmetal anti-float anchor rod:
(1), by steel plate for sealing water being inserted in steel pile casting and adopt the mode firm welding of two-sided welding, welding position is positioned at the centre of outer anchoring section, at two-sided all brushing antirust paints of steel pile casting outer wall and steel plate for sealing water after welding;
(2), the steel pile casting with steel plate for sealing water is pre-installed on outer anchoring section, when the grouted part of anchor rod body is constructed, the reserved 10cm in the top of grouted part is used for installing steel pile casting, localizer is arranged on the outer surface of anchor rod body and is located at outer anchoring section, anchor rod body traverse steel pile casting, adjusting the position of localizer again, make localizer be positioned at 5cm place below steel pile casting end face, grouted part has been constructed rear maintenance 28 days;
(3) the reinforced concrete floor lower end, bottom steel pile casting is symmetrically welded two angle bar, during welding, steel pile casting is lifted up 5mm, and Rock And Soil is close to by angle bar, makes angle bar be secured firmly on Rock And Soil by steel pile casting;
(4) on grouted part, the bed course of plain concrete material, is built and levelling;
(5), after bed course maintenance 7 days, in steel pile casting, cement mortar is injected, until steel pile casting end face, with bar reinforcement by cement mortar vibration compacting in filling process;
(6) on bed course by anchor rod body, steel pile casting, steel plate for sealing water and cement mortar concreting in reinforced concrete floor, concrete strength grade is determined according to designing requirement, it is achieved the anchoring of anchor rod body and reinforced concrete floor.
The present invention compares in prior art, have the advantage that one is utilize the erosion-resisting characteristic of glass fiber compound material (GFRP) itself to make the solid GFRP anti-float anchor rod of full thread, the service life making anchor rod body is greatly prolonged, thus providing reliable measure of anti float for the stratum, buildings or structures basis that environmental corrosion is serious, it is particularly well-suited to the resisting buoyancy of foundation in the Construction of Urban Rail Traffic such as subway; Two is GFRP anti-float anchor rod anchoring section inner bending outside anchoring, using the teaching of the invention it is possible to provide bigger anchor force, solves an outer anchoring difficult problem for the puzzlement nonmetal anti-float anchor rod of engineering circles; Three is install steel pile casting in outer anchoring section, it is possible to ensure that anchor pole is not cut up by horizontal force; Four is arrange ring-type steel plate for sealing water in outer anchoring section can effectively stop that capillary water causes infiltration hidden danger along body of rod rising, improves the permeability resistance of underground structure; Its simple in construction, easy to operate, cost is low, it is simple to installing and construction, long service life, anchor force is big, and anchoring effect is good.
Accompanying drawing illustrates:
Fig. 1 is the main body main structure principle schematic of the present invention.
Fig. 2 is the A-A cross-section structure principle schematic of the present invention.
Fig. 3 is the structural principle schematic diagram (B-B section) of localizer of the present invention.
Detailed description of the invention:
The present invention will be further described by the examples below and in conjunction with accompanying drawing.
Embodiment:
The agent structure of the outer anchor of nonmetal anti-float anchor rod described in the present embodiment includes anchor rod body 3, localizer 4, steel pile casting 5, angle bar 6, steel plate for sealing water 7, bed course 8, cement mortar 9, reinforced concrete floor 10 and Rock And Soil 11; The anchor rod body 3 of full thread solid construction adopts glass fiber compound material (GFRP) to make, to improve the cohesion between anchor rod body 3 and anchoring body, thus providing enough anchoring frictional force, anchor rod body 3 is made up of grouted part 1 and outer anchoring section 2 two parts, anchor rod body 1 anchoring section 2 inner bending outside is at a right angle, 3-5 times that radius is anchor rod body 3 diameter of arc place, bending place circle; Outer anchoring section 2 is provided with localizer 4, and localizer 4 is connected with anchor rod body 3 and steel pile casting 5 respectively, plays centering effect when anchor rod body 3 is installed, and makes anchor rod body 3 have enough protective layers; Equipped with steel pile casting 5 outside outer anchoring section 2, steel pile casting 5, the outer anchoring section 2 of anchor rod body 3 and localizer 4 adopt cement mortar 9 tight bond; Angle bar 6 is welded on the outer wall bottom steel pile casting 5, and steel pile casting 5 and angle bar 6 are fixed on Rock And Soil 11 all in a welding manner; Bed course 8 is laid on Rock And Soil 11, and bed course 8 is connected with grouted part 1, outer anchoring section 2 respectively; The lateral wall of steel pile casting 5 is welded with steel plate for sealing water 7, the closely coupled formation integral structure of outer anchoring section 2 of steel pile casting 5 and steel plate for sealing water 7 and anchor rod body 3, the integral structure of outer anchoring section 2 composition of steel pile casting 5, steel plate for sealing water 7 and anchor rod body 3 is built in reinforced concrete floor 10, it is provided that reach the purpose of waterproof while continuing anchor force.
It is M30 or M32.5 as the strength grade of described cement mortar 9 of the present invention.
The seamless steel pipe that steel pile casting 5 is diameter 146mm, wall thickness 8mm described in the present embodiment, the outer wall of steel pile casting 5 respectively with reinforced concrete floor 10 and bed course 8 tight bond, inwall and cement mortar 9 tight bond, steel pile casting 5 is arranged on the outer anchoring section 2 of anti-float anchor rod 3 can not only quickly form anti-floating anchor force, moreover it is possible to ensure that anti-float anchor rod is not cut up by horizontal force.
The specifications and models of angle bar 6 described in the present embodiment are 40mm �� 40mm �� 3mm, and length is 30cm, is fixed on bed course 8 by steel pile casting 5.
Steel plate for sealing water 7 described in the present embodiment adopts thickness to be 4mm, diameter is the circular steel plate of 450mm to make, middle reserved aperture is the hole of 150mm, closely coupled by the outer wall of the mode welded and steel pile casting 5, and form entirety with outer anchoring section 2, reach waterproof purpose.
Described in the present embodiment, bed course 8 is between grouted part 1 and outer anchoring section 2, is made up of the C15 plain concrete that thickness is 100mm, plays water proof, draining, antifreeze and improve the effect of anti-float anchor rod working condition.
The present embodiment realizes the detailed process of anchoring outside nonmetal anti-float anchor rod:
(1), by steel plate for sealing water 7 being inserted in steel pile casting 5 and adopt the mode firm welding of two-sided welding, welding position is positioned at the centre of outer anchoring section 2, at two-sided all brushing antirust paints of steel pile casting 5 outer wall and steel plate for sealing water 7 after welding;
(2), the steel pile casting 5 with steel plate for sealing water 7 is pre-installed on outer anchoring section 2, when the grouted part 1 of anchor rod body 3 is constructed, the reserved 10cm in the top of grouted part 1 is used for installing steel pile casting 5, localizer 4 is arranged on the outer surface of anchor rod body 3 and is located at outer anchoring section 2, anchor rod body 3 traverse steel pile casting 5, adjusting the position of localizer 4 again, make localizer 4 be positioned at 5cm place below steel pile casting 5 end face, grouted part 1 has been constructed rear maintenance 28 days;
(3) reinforced concrete floor 10 lower end, bottom steel pile casting 5 is symmetrically welded two angle bar 6, during welding, steel pile casting 4 is lifted up 5mm, and Rock And Soil 11 is close to by angle bar 6, makes angle bar 6 be secured firmly on Rock And Soil 11 by steel pile casting 5;
(4) on grouted part 1, the bed course 8 of plain concrete material, is built and levelling;
(5), after bed course maintenance 7 days, in steel pile casting 5, cement mortar 9 is injected, until steel pile casting 5 end face, with bar reinforcement by cement mortar 9 vibration compacting in filling process;
(6) use concreting in reinforced concrete floor 10 anchor rod body 3, steel pile casting 5, steel plate for sealing water 7 and cement mortar 9 on bed course 8, concrete strength grade is determined according to designing requirement, it is achieved the anchoring of anchor rod body 1 and reinforced concrete floor 10.

Claims (7)

1. the outer anchor of nonmetal anti-float anchor rod, it is characterised in that agent structure includes anchor rod body, localizer, steel pile casting, angle bar, steel plate for sealing water, bed course, cement mortar, reinforced concrete floor and Rock And Soil; The anchor rod body of full thread solid construction adopts glass fiber compound material to make, to improve the cohesion between anchor rod body and anchoring body, thus providing enough anchoring frictional force, anchor rod body is made up of grouted part and outer anchoring section two parts, anchor rod body anchoring section inner bending outside is at a right angle, 3-5 times that radius is anchor rod body diameter of arc place, bending place circle; Outer anchoring section is provided with localizer, and localizer is connected with anchor rod body and steel pile casting respectively, plays centering effect when anchor rod body is installed, and makes anchor rod body have enough protective layers; Equipped with steel pile casting outside outer anchoring section, steel pile casting, the outer anchoring section of anchor rod body and localizer adopt cement mortar tight bond; Angle bar is welded on the outer wall bottom steel pile casting, and steel pile casting and angle bar are fixed on Rock And Soil all in a welding manner; Bed course is laid on Rock And Soil, and bed course is connected with grouted part, outer anchoring section respectively; The lateral wall of steel pile casting is welded with steel plate for sealing water, the closely coupled formation integral structure of outer anchoring section of steel pile casting, steel plate for sealing water and anchor rod body, the integral structure of the outer anchoring section composition of steel pile casting, steel plate for sealing water and anchor rod body is built in reinforced concrete floor, it is provided that reach the purpose of waterproof while continuing anchor force.
2. the outer anchor of nonmetal anti-float anchor rod according to claim 1, it is characterised in that be M30 or M32.5 as the strength grade of described cement mortar.
3. the outer anchor of nonmetal anti-float anchor rod according to claim 1, it is characterised in that described steel pile casting is the seamless steel pipe of diameter 146mm, wall thickness 8mm.
4. the outer anchor of nonmetal anti-float anchor rod according to claim 1, it is characterised in that the specifications and models of described angle bar are 40mm �� 40mm �� 3mm, and length is 30cm.
5. the outer anchor of nonmetal anti-float anchor rod according to claim 1, it is characterized in that adopting thickness by described steel plate for sealing water to be 4mm, diameter be that the circular steel plate of 450mm is made, middle reserved aperture is the hole of 150mm, closely coupled with the outer wall of steel pile casting by the mode welded.
6. the outer anchor of nonmetal anti-float anchor rod according to claim 1, it is characterised in that described bed course is made up of the C15 plain concrete that thickness is 100mm.
7. the outer anchor of nonmetal anti-float anchor rod according to claim 1, it is characterised in that adopt this device to realize the detailed process of anchoring outside nonmetal anti-float anchor rod to be:
(1), by steel plate for sealing water being inserted in steel pile casting and adopt the mode firm welding of two-sided welding, welding position is positioned at the centre of outer anchoring section, at two-sided all brushing antirust paints of steel pile casting outer wall and steel plate for sealing water after welding;
(2), the steel pile casting with steel plate for sealing water is pre-installed on outer anchoring section, when the grouted part of anchor rod body is constructed, the reserved 10cm in the top of grouted part is used for installing steel pile casting, localizer is arranged on the outer surface of anchor rod body and is located at outer anchoring section, anchor rod body traverse steel pile casting, adjusting the position of localizer again, make localizer be positioned at 5cm place below steel pile casting end face, grouted part has been constructed rear maintenance 28 days;
(3) the reinforced concrete floor lower end, bottom steel pile casting is symmetrically welded two angle bar, during welding, steel pile casting is lifted up 5mm, and Rock And Soil is close to by angle bar, makes angle bar be secured firmly on Rock And Soil by steel pile casting;
(4) on grouted part, the bed course of plain concrete material, is built and levelling;
(5), after bed course maintenance 7 days, in steel pile casting, cement mortar is injected, until steel pile casting end face, with bar reinforcement by cement mortar vibration compacting in filling process;
(6) on bed course by anchor rod body, steel pile casting, steel plate for sealing water and cement mortar concreting in reinforced concrete floor, concrete strength grade is determined according to designing requirement, it is achieved the anchoring of anchor rod body and reinforced concrete floor.
CN201610004754.3A 2016-01-04 2016-01-04 External anchoring device for non-metal anti-floating anchor rod Active CN105625421B (en)

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CN105625421B CN105625421B (en) 2018-01-23

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109706926A (en) * 2019-01-31 2019-05-03 青岛理工大学 Novel fiber rib anti-floating anchor rod anchoring device
CN110130410A (en) * 2019-06-05 2019-08-16 中国五冶集团有限公司 A kind of device controlling the straight anchor section of anti-float anchor rod
WO2020151348A1 (en) * 2019-01-24 2020-07-30 深圳市地质环境研究院有限公司 Prefabricated prestressed anchor rod construction method
CN113550308A (en) * 2021-07-23 2021-10-26 江苏中汇岩土工程有限公司 External anchoring device for non-metal anti-floating anchor rod
CN114482142A (en) * 2022-02-14 2022-05-13 青岛理工大学 Major diameter finish rolling screw-thread steel anti-floating anchor rod
CN114561939A (en) * 2022-02-12 2022-05-31 中国五冶集团有限公司 Anti-floating anchor rod sectional grouting construction method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090020770A (en) * 2007-08-24 2009-02-27 김승관 Permanent type anchor having fixing steel pipes with different length according to the weight
CN102900081A (en) * 2012-11-11 2013-01-30 青岛理工大学 Non-metal anti-floating anchor rod and anchoring method thereof
CN103306283A (en) * 2013-06-25 2013-09-18 青岛理工大学 Method for improving shear strength of non-metal anti-floating anchor rod
CN104018500A (en) * 2014-06-28 2014-09-03 山东正元建设工程有限责任公司 Anchor rod structure for preventing stray-current corrosion
CN104674809A (en) * 2015-03-06 2015-06-03 中国建筑第八工程局有限公司 Anti-floating anchor rod structure and construction method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090020770A (en) * 2007-08-24 2009-02-27 김승관 Permanent type anchor having fixing steel pipes with different length according to the weight
CN102900081A (en) * 2012-11-11 2013-01-30 青岛理工大学 Non-metal anti-floating anchor rod and anchoring method thereof
CN103306283A (en) * 2013-06-25 2013-09-18 青岛理工大学 Method for improving shear strength of non-metal anti-floating anchor rod
CN104018500A (en) * 2014-06-28 2014-09-03 山东正元建设工程有限责任公司 Anchor rod structure for preventing stray-current corrosion
CN104674809A (en) * 2015-03-06 2015-06-03 中国建筑第八工程局有限公司 Anti-floating anchor rod structure and construction method thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020151348A1 (en) * 2019-01-24 2020-07-30 深圳市地质环境研究院有限公司 Prefabricated prestressed anchor rod construction method
CN109706926A (en) * 2019-01-31 2019-05-03 青岛理工大学 Novel fiber rib anti-floating anchor rod anchoring device
CN110130410A (en) * 2019-06-05 2019-08-16 中国五冶集团有限公司 A kind of device controlling the straight anchor section of anti-float anchor rod
CN110130410B (en) * 2019-06-05 2023-12-26 中国五冶集团有限公司 Device for controlling straight anchor section of anti-floating anchor rod
CN113550308A (en) * 2021-07-23 2021-10-26 江苏中汇岩土工程有限公司 External anchoring device for non-metal anti-floating anchor rod
CN114561939A (en) * 2022-02-12 2022-05-31 中国五冶集团有限公司 Anti-floating anchor rod sectional grouting construction method
CN114482142A (en) * 2022-02-14 2022-05-13 青岛理工大学 Major diameter finish rolling screw-thread steel anti-floating anchor rod

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