CN109208593B - Device for compensating prestress loss and construction method thereof - Google Patents
Device for compensating prestress loss and construction method thereof Download PDFInfo
- Publication number
- CN109208593B CN109208593B CN201811226720.4A CN201811226720A CN109208593B CN 109208593 B CN109208593 B CN 109208593B CN 201811226720 A CN201811226720 A CN 201811226720A CN 109208593 B CN109208593 B CN 109208593B
- Authority
- CN
- China
- Prior art keywords
- prestress
- anchor rod
- bowl
- clamping
- loss
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
Abstract
The invention discloses a device for compensating prestress loss and a construction method thereof, wherein the device comprises a prestress anchor rod, a clamping piece and an anchorage device; the clamping piece is of a circular truncated cone shape and is connected with the prestressed anchor rod, the anchorage device comprises an expansion tooth bowl and a fastening device, the expansion tooth bowl comprises a plurality of bowl walls and a plurality of clamping groove units which are connected with each other from top to bottom and from head to tail, the clamping groove units are matched with the clamping piece for use, each clamping groove unit consists of a plurality of clamping grooves, springs are arranged between the clamping grooves, the clamping grooves are fixedly connected with the bowl walls, and the fastening device is arranged outside the bowl walls; an adjusting device is arranged below each clamping groove, each adjusting device comprises a hollow structure and an entity structure positioned in the hollow structure, the bottom of each hollow structure is fixedly connected with an anchor backing plate, two opposite sides of each hollow structure are respectively provided with an arc-shaped slideway, each entity structure is fixedly connected with a bowl wall, two opposite sides of each entity structure are respectively provided with a shaft, and each shaft is in sliding connection with each arc-shaped slideway; the invention effectively compensates the prestress loss and has the advantages of short construction period, simple and convenient construction, obvious treatment effect and the like.
Description
Technical Field
The invention belongs to the technical field of civil engineering geotechnical anchoring, and mainly relates to a device for compensating prestress loss and a construction method thereof.
Background
The anchoring technology is an important subject in the field of geotechnical engineering, and has wide application range and various setting forms. The prestressed anchor cable is an important reinforcing means in geotechnical engineering, and after being installed, the prestressed anchor cable can actively apply compressive stress to a reinforced geotechnical body immediately, and can effectively limit possible harmful deformation and displacement, thereby improving the stability of the geotechnical body and ensuring the engineering safety. The prestressed anchor cable is an efficient, economical and practical engineering technology.
For rocky slopes with poor stability, the prestressed anchor cable is mostly adopted for reinforcement at present, and compared with other support measures, the prestressed anchor cable reinforcement has the characteristics that ① can provide anchoring force in time after excavation, development of stratum deformation is favorably controlled, further disturbance of the stratum is avoided, and construction safety is improved, the extrusion anchoring force provided by ② can effectively improve the stress state of the stratum, so that the mechanical characteristics of rock-soil bodies are improved, the integral stability of the slopes is improved, parameters such as the position, the interval, the construction time and the like of ③ prestressed anchor cables can be adjusted in time according to needs, the best stability effect can be obtained through minimum supporting resistance, construction is rapid and efficient, ④ prestressed anchor cables can tightly connect structures and rock-soil bodies to form a common working system, the capability of the anchoring bodies for resisting earthquake and other dynamic loads is obviously enhanced, construction is designed to be safe and reliable, ⑤ is compared with the structural form of retaining walls and slide piles, the structural volume is small, materials can be saved, the land utilization rate of land is improved, economic benefits are obvious, ⑥ flexibility of application of the prestressed anchor cables and the anchor cables are very good for slope building, and the anchor cable is one of the anchor cable is favorable for securing safety and the engineering, so that the anchor cable is one of the slope strengthening, the anchor cable has the most effective protection and the protection method for securing the slope protection of civil engineering, and the slope protection method for securing the slope protection of the slope.
In the construction process of the anchor cable, the anchor cable is stretched through stretching equipment, and after stretching is completed, the anchor cable is connected to the anchorage device, so that the anchorage device and the anchor cable are integrally fixed on the anchor pier. However, the prestressed anchor cable may cause a prestress loss due to soil creep, impact, cable material relaxation, etc., so that the prestress value of the anchor cable is smaller than a design value, and the stability of the anchoring engineering is threatened.
In the prior art, the compensation of the prestress loss of the anchor cable can only be carried out before the anchor cable is put into use, but the prestress compensation cannot be carried out in the use process of the anchor cable, for example, the prestress of the anchor cable is lost and cannot be carried out due to the influence of factors such as creep of a rock body, relaxation of steel, rainfall, temperature, underground water and the like.
Disclosure of Invention
In order to solve the harm caused by the prestress loss in the actual engineering, the invention provides a device for compensating the prestress loss and a construction method thereof.
The technical scheme of the invention is as follows: a device for compensating prestress loss comprises a prestress anchor rod, an anchoring section, a free section, an anchor backing plate, a clamping piece and an anchor; the clamping piece is of a circular truncated cone shape and is rigidly connected with the prestressed anchor rod, the anchorage device comprises an expansion tooth bowl and a fastening device, the expansion tooth bowl comprises a plurality of bowl walls distributed in an annular array and a plurality of clamping groove units which are mutually connected from top to bottom and from head to tail, the clamping groove units are matched with the clamping piece for use, each clamping groove unit consists of a plurality of clamping grooves distributed in an annular array, springs are arranged between the clamping grooves, the clamping grooves are fixedly connected with the bowl walls (the clamping grooves correspond to the bowl walls), external threads are arranged outside the bowl walls, and internal threads matched with the external threads are arranged inside the fastening device; an adjusting device is further arranged below each clamping groove and comprises a hollow structure and an entity structure positioned in the hollow structure, the bottom of the hollow structure is fixedly connected with the anchor backing plate, arc-shaped slideways are respectively arranged on two opposite sides of the hollow structure, the entity structure is fixedly connected with the bowl wall, shafts are respectively arranged on two opposite sides of the entity structure, and the shafts are in sliding connection with the arc-shaped slideways; when the prestressed anchor rod is installed for the first time, the expansion tooth bowl is cylindrical, and the clamping piece is clamped in the groove by the clamping groove unit to form a small cylinder, so that the clamping piece is not pulled out; after the prestress loss, the fastening device is screwed off, the prestressed anchor rod is pulled, the clamping piece is in one-way upward, the spring between the clamping grooves is stretched and opened (the spring between the clamping grooves in the clamping groove units matched with the clamping piece is stretched), the shaft of the adjusting device slides along the arc-shaped slide way to enable the wall of the bowl to be outwardly opened, the clamping piece is pulled out, due to the action of the spring, when the clamping piece is pulled to the next clamping groove unit, the clamping groove is automatically closed, the clamping piece is clamped in the next clamping groove unit, and the expansion tooth bowl returns to be cylindrical.
The prestressed anchor rod is anchored in a rock body, and an anchoring section adopts an expanding end.
The prestressed anchor rod can be made of steel stranded wires, reinforcing steel bars and high-strength inorganic materials, and can be a single rod or a plurality of rods.
When the prestressed anchor rod is installed for the first time, the shaft is positioned on the inner side of the arc-shaped slideway; when the prestressed anchor is pulled after the prestress is lost, the shaft slides outwards along the arc-shaped slideway.
The arc-shaped slideways on the two opposite sides of the hollow structure are symmetrically distributed; the solid structure is axisymmetrically distributed on two opposite sides.
The clamping grooves in each clamping groove unit correspond to the bowl walls one by one (the distribution of the clamping grooves in each clamping groove unit is the same as that of the bowl walls). More than three card slots are arranged in each card slot unit, and four card slots are optimal.
Furthermore, the free section of the prestressed anchor rod is not bonded and can slide relative to the grouting body.
Furthermore, the anchoring section of the prestressed anchor rod is anchored in a rock body and cannot slide relative to the grouting body.
Furthermore, a prefabricated protection device is arranged outside the fastening device, and can protect the prestress compensation device.
The anchor rod may also be an anchor cable.
The invention also provides a construction method of the device for compensating the prestress loss, which comprises the following steps:
firstly, drilling an anchor rod hole channel at a design position; and inserting the prestressed anchor rod into the anchor rod pore channel.
Secondly, mounting a PVC sleeve at the free section of the prestressed anchor rod, and then performing grouting, exhausting, mounting an anchor backing plate (the thickness of the anchor backing plate corresponds to the distance from the bottom of the expansion tooth bowl to the rock mass) and prestressed tensioning;
and thirdly, fixing the prestressed anchor rod connected with the clamping piece in the expansion tooth bowl, and then screwing the prestressed anchor rod outside the bowl wall by using a fastening device.
Further, the grouting body is injected through the anchor rod hole.
The anchor rod may also be an anchor cable.
Compared with the prior art, the invention has the following beneficial effects: the device for compensating the prestress loss and the construction method thereof can effectively compensate the prestress loss caused by factors such as creep of rock mass, relaxation of steel, rainfall, temperature, underground water change and the like, and have the advantages of short construction period, simple and convenient construction process, remarkable treatment effect, low construction cost and the like.
Drawings
Fig. 1 is a schematic elevation structure of the present invention.
Fig. 2 is a schematic view of an expansion tooth bowl of the present invention.
FIG. 3 is a schematic view of the connection between the prestressed anchor and the clamping member according to the present invention.
FIG. 4 is a top view of the expanding tooth bowl when the prestressed anchor is pulled after the loss of prestress.
FIG. 5 is a schematic view of the hollow structure of the present invention.
FIG. 6 is a schematic diagram of the physical structure of the present invention.
Wherein, 1 is the prestressed anchorage pole, 2 are the fastener, 3 are the inflation tooth bowl, 4 are fastener, 5 are the anchor backing plate, 6 are the stock pore, 7 are the enlarged type end, 8 are the rock mass, 9 are the free segment, 10 are the anchor section, 11 are the spring, 12 are the arc slide, 13 are the axle.
Detailed Description
Example 1
The invention relates to a device for compensating prestress loss and a construction method thereof, which aim to solve the harm caused by the prestress loss in actual engineering. To further clarify the technical means and effects adopted by the present invention in achieving the intended objects, the present invention will be further described with reference to the accompanying drawings,
as shown in fig. 1-4, a device for compensating the prestress loss comprises a prestress anchor rod 1, an anchoring section, a free section, an anchor backing plate 5, a clamping piece 2 and an anchorage device; the clamping piece 2 is of a circular truncated cone shape and is rigidly connected with the prestressed anchor rod 1, the anchorage device comprises an expansion tooth bowl 3 and a fastening device 4, the expansion tooth bowl 3 comprises four bowl walls distributed in an annular array and a plurality of clamping groove units which are mutually connected from top to bottom and from head to tail, the clamping groove units are matched with the clamping piece for use, each clamping groove unit consists of four clamping grooves distributed in an annular array, springs 11 are arranged between the clamping grooves, the clamping grooves are fixedly connected with the bowl walls, the clamping grooves in each clamping groove unit correspond to the bowl walls one by one, external threads are arranged outside the bowl walls, and internal threads matched with the external threads are arranged inside the fastening device; an adjusting device is further arranged below each clamping groove and comprises a hollow structure and an entity structure positioned in the hollow structure, the bottom of the hollow structure is fixedly connected with the anchor backing plate 5, arc-shaped slideways 12 are respectively arranged on two opposite sides of the hollow structure, the entity structure is fixedly connected with the bowl wall, shafts 13 are respectively arranged on two opposite sides of the entity structure, and the shafts 13 are in sliding connection with the arc-shaped slideways 12; when the prestressed anchor rod 1 is installed for the first time, the expansion tooth bowl 3 is cylindrical, and the clamping piece 2 is clamped in the groove by the clamping groove unit to form a small cylinder, so that the clamping piece 2 is not pulled out; after the loss of prestressing force, screw down fastener 4, draw prestressed anchorage pole 1, fastener 2 is one-way upwards, spring 11 between the draw-in groove is tensile, open (with the draw-in groove between the draw-in groove unit of fastener 2 mutually supporting spring is tensile), adjusting device's axle 13 slides along arc slide 12 and makes the bowl wall outwards open, fastener 2 pulls out, because spring 11's effect, when fastener 2 is pulled next draw-in groove unit, the draw-in groove shrink, it is automatic closed, fastener 2 card is at next draw-in groove unit, inflation tooth bowl 3 returns cylindrically.
The prestressed anchor rod is anchored in a rock body, and an anchoring section adopts an expanding end.
The prestressed anchor rod can be made of steel stranded wires, reinforcing steel bars and high-strength inorganic materials, and can be a single rod or a plurality of rods.
When the prestressed anchor rod 1 is installed for the first time, the shaft 13 is positioned at the inner side of the arc-shaped slideway 12; when the prestressed anchor rod 1 is pulled after the prestress is lost, the shaft 13 slides outwards along the arc-shaped slideway 12; when the cartridge 2 is pulled to the next slot unit, the shaft 13 slides inwardly along the arcuate slide 12, returning the expanding toothed bowl 3 to the cylindrical shape.
The arc-shaped slideways 12 on the two opposite sides of the hollow structure are symmetrically distributed; the axes 13 on opposite sides of the solid structure are symmetrically distributed.
The free section 9 of the prestressed anchor rod 1 is not bonded and can slide relative to the grouting body. The anchoring section 10 of the prestressed anchor rod 1 is anchored in a rock body and can not slide relative to grouting.
The prestress compensation device can be protected.
In the construction process, the construction steps are as follows:
firstly, designing the prestress of an anchor rod (anchor cable), the anchoring length of an anchoring section and the distance between the anchor rods (anchor cables) according to the surrounding rock conditions of a construction site and the requirement of stability control, drilling an anchor rod hole channel 6 in a rock body 8 by using a drilling machine at the designed position according to design parameters, and then reserving space for the construction of the enlarged end head at the tail end position of the anchor rod hole channel 6 by means of rotation, impact and the like.
And secondly, after the construction of the anchor rod duct 6 is finished, according to the designed anchoring length, expanding and fixing the end of the prestressed anchor rod (anchor cable) 1 connected with the enlarged end 7, so that the prestressed anchor rod 1 is fixed in the anchor rod duct 6.
Thirdly, a PVC sleeve is arranged on the free section 9 of the prestressed anchor rod 1, the PVC sleeve is arranged on the distance from the bottom end of the free section 9 of the prestressed anchor rod 1 to the lower part of the anchor backing plate 5, and then grouting, exhausting, anchor backing plate installation and prestressed tensioning are carried out on the anchor rod pore passage 6.
Fourthly, fixing the clamping groove unit connected with the clamping piece 2 (fixing the prestressed anchor rod 1 connected with the clamping piece 2 in the expansion tooth bowl 3), then screwing the clamping piece 2 outside the bowl wall by using a fastening device 4, and finally installing a protection device.
Once the prestress loss is caused by the factors of creep of rock mass, relaxation of steel, rainfall, temperature and change of underground water and the like, the device is adopted for prestress compensation, and the concrete steps are as follows: the fastening device 4 fixed outside the expansion tooth bowl is screwed down, the outer end of the prestressed anchor rod is clamped, a drawing machine is adopted to carry out secondary drawing on the prestressed anchor rod (anchor cable), the wall of the expansion tooth bowl can be opened, the clamping piece is convenient to pull upwards in a single direction, but due to the action of the high-strength spring 11, the clamping piece is automatically closed when being pulled to the next clamping groove unit, the expansion tooth bowl 3 returns to be cylindrical, the prestressed anchor rod (anchor cable) cannot be reversely pulled into a rock body, the purpose of compensating the prestress is achieved, the field measurement is carried out, whether the prestress is monitored to reach the design standard or not, and if the prestress reaches the design standard, the steps are repeated. After the compensation of the prestress is finished, the fastening device 4 is screwed to complete the compensation of the prestress, and finally, a prefabricated protection device is installed outside the prestress compensation device to protect the prestress compensation device from being corroded by external rainwater and the like.
The prestressed anchor rod can also be a prestressed anchor cable.
Claims (10)
1. A device for compensating prestress loss comprises a prestress anchor rod (1), an anchoring section, a free section (9) and an anchor backing plate (5), and is characterized by also comprising a clamping piece (2) and an anchor; the clamping piece (2) is of a circular truncated cone shape and is rigidly connected with the prestressed anchor rod, the anchor comprises an expansion tooth bowl (3) and a fastening device (4), the expansion tooth bowl (3) comprises a plurality of bowl walls distributed in an annular array and a plurality of clamping groove units which are mutually connected from top to bottom and from head to tail, the clamping groove units are matched with the clamping piece for use, each clamping groove unit consists of a plurality of clamping grooves distributed in an annular array, a spring (11) is arranged between the clamping grooves, the clamping grooves are fixedly connected with the bowl walls, external threads are arranged outside the bowl walls, and internal threads matched with the external threads are arranged inside the fastening device (4); an adjusting device is further arranged below each clamping groove and comprises a hollow structure and an entity structure positioned in the hollow structure, the bottom of the hollow structure is fixedly connected with the anchor backing plate (5), arc-shaped slideways (12) are respectively arranged on two opposite sides of the hollow structure, the entity structure is fixedly connected with the bowl wall, shafts (13) are respectively arranged on two opposite sides of the entity structure, and the shafts (13) are in sliding connection with the arc-shaped slideways (12); when the prestressed anchor rod (1) is installed for the first time, the expansion tooth bowl (3) is cylindrical, and the clamping piece (2) is clamped in the groove by the clamping groove unit to form a small cylinder, so that the clamping piece (2) is not pulled out; after the prestress loss, fastening device (4) is unscrewed, the prestressed anchor rod (1) is pulled, the clamping piece (2) is made to be single-way upward, a spring (11) between the clamping grooves is stretched, an adjusting device shaft (13) slides along an arc-shaped slide way (12) to enable the bowl wall to be outwards opened, the clamping piece (2) is pulled out, due to the action of the spring (11), when the clamping piece is pulled to a next clamping groove unit, the clamping groove is automatically closed, the clamping piece (2) is clamped at the next clamping groove unit, and the expansion tooth bowl returns to be cylindrical.
2. An apparatus for compensating a loss of prestress as set forth in claim 1, wherein: the prestressed anchor rod is anchored in a rock body (8), and an anchoring section adopts an enlarged end head (7).
3. An apparatus for compensating a loss of prestress as set forth in claim 1, wherein: when the prestressed anchor rod (1) is installed for the first time, the shaft (13) is positioned on the inner side of the arc-shaped slideway (12); when the prestressed anchor is pulled after the prestress is lost, the shaft (13) slides outwards along the arc-shaped slideway (12).
4. An apparatus for compensating a loss of prestress as set forth in claim 1, wherein: the arc-shaped slideways (12) on two opposite sides of the hollow structure are symmetrically distributed; the axes (13) of the opposite sides of the solid structure are symmetrically distributed.
5. An apparatus for compensating a loss of prestress as set forth in claim 1, wherein: the clamping grooves in each clamping groove unit correspond to the bowl walls one by one.
6. An apparatus for compensating a loss of prestress as set forth in claim 1, wherein: more than three card slots are arranged in each card slot unit.
7. An apparatus for compensating a loss of prestress as set forth in claim 1, wherein: the free section of the prestressed anchor rod (1) is not bonded and slides relative to the grouting body; the anchoring section of the prestressed anchor rod (1) is anchored in a rock body and can not slide relative to the grouting body.
8. An apparatus for compensating for loss of prestress according to claim 1, wherein: the outside of the fastening device (4) is provided with a prefabricated protection device.
9. An apparatus for compensating a loss of prestress as set forth in claim 1, wherein: the prestressed anchor rod (1) is replaced by a prestressed anchor cable.
10. A method of constructing the apparatus for compensating for prestress loss of claim 1, comprising the steps of:
firstly, drilling an anchor rod duct (6) at a design position, and inserting a prestressed anchor rod (1) into the anchor rod duct (6);
secondly, mounting a PVC sleeve at the free section (9) of the prestressed anchor rod, and then performing grouting, exhausting, mounting an anchor backing plate and prestressed tensioning;
thirdly, fixing the prestressed anchor rod (1) connected with the clamping piece (2) in the expansion tooth bowl (3), and then screwing the prestressed anchor rod outside the bowl wall by using a fastening device (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811226720.4A CN109208593B (en) | 2018-10-22 | 2018-10-22 | Device for compensating prestress loss and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811226720.4A CN109208593B (en) | 2018-10-22 | 2018-10-22 | Device for compensating prestress loss and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109208593A CN109208593A (en) | 2019-01-15 |
| CN109208593B true CN109208593B (en) | 2020-08-07 |
Family
ID=64981263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811226720.4A Active CN109208593B (en) | 2018-10-22 | 2018-10-22 | Device for compensating prestress loss and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109208593B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112576290A (en) * | 2020-11-10 | 2021-03-30 | 浙江省建筑设计研究院 | Prestress compensation anchorage device with monitoring function applied to prestress anchor rod |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1109570A (en) * | 1965-12-15 | 1968-04-10 | Rawlplug Co Ltd | Expansible bolt anchoring device |
| EP1518976A1 (en) * | 2003-09-26 | 2005-03-30 | André Nicolet | Post with barbed anchors |
| CN100408761C (en) * | 2005-05-17 | 2008-08-06 | 周兆弟 | Eleastic expansion meshing body pile connecting end plate and prefab |
| CN103774649B (en) * | 2012-10-26 | 2015-10-28 | 兰州大学 | Anti-mouth prevents the prestressed anchor extracted from anchor hole |
| CN107447756A (en) * | 2017-09-25 | 2017-12-08 | 西南石油大学 | A kind of constructing device for compensating prestressd anchor cable loss and compensation construction method |
-
2018
- 2018-10-22 CN CN201811226720.4A patent/CN109208593B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109208593A (en) | 2019-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7207149B2 (en) | Anchor and method for reinforcing a structure | |
| CN105626112B (en) | A kind of suspension device and its application method based on built-in constant-resistance device | |
| KR101152265B1 (en) | Prestressed bored pile construction method and structures | |
| CN201704689U (en) | Four-corner-reinforced pre-stressed anchor rope head for reinforcing rock slope | |
| CN104032737A (en) | Construction method and structure of pressure dispersing type expansion head anchor rod | |
| CN104818723B (en) | Slope retaining friction pile | |
| CN111877366A (en) | Combined type foundation pit supporting structure and construction method thereof | |
| US20210381188A1 (en) | Ground Anchor | |
| CN109208593B (en) | Device for compensating prestress loss and construction method thereof | |
| CN104727317B (en) | A kind of combinative structure reducing prestressd anchor cable loss | |
| CA2849780A1 (en) | Friction pile extension | |
| CN113123373A (en) | Pressure-bearing uplift pile with rear-inserted unbonded steel strand U-shaped pipe and construction method thereof | |
| KR102079563B1 (en) | Compression friction type anchor panel ground reinforcement system | |
| JP4017766B2 (en) | Hollow cylindrical body and its construction method | |
| CN212506313U (en) | Combined foundation pit supporting structure | |
| KR102111153B1 (en) | Retaining Wall Panel Structure using PC Strand | |
| CN104818725B (en) | Slope and land slide body locking and fastening system | |
| CN108797583B (en) | Anti-seismic prestressed anchor cable and construction method thereof | |
| CN203866824U (en) | Pressure-dispersing type expansion anchor rod structure | |
| CN203655326U (en) | Liquid-expansion yielding shock and high ground temperature resistant anchor rod | |
| KR101298020B1 (en) | Special prestressed method | |
| IT202000016588A1 (en) | SYSTEM AND METHOD OF FOUNDATION WITH SEISMIC ISOLATION OF BUILDINGS | |
| KR101125615B1 (en) | The bar anchors for stabilizing ground and it's procedure of installation | |
| CN111691415B (en) | Multi-strand glass fiber prestressed anchor rod and construction method thereof | |
| CN214784243U (en) | Back-inserted unbonded steel strand U-shaped pipe pressure-bearing uplift pile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |