CN113513031A - Foundation pit support anchorage device and anchor cable construction method - Google Patents
Foundation pit support anchorage device and anchor cable construction method Download PDFInfo
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- CN113513031A CN113513031A CN202110990237.9A CN202110990237A CN113513031A CN 113513031 A CN113513031 A CN 113513031A CN 202110990237 A CN202110990237 A CN 202110990237A CN 113513031 A CN113513031 A CN 113513031A
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- anchor
- anchor cable
- pedestal
- ground tackle
- grouting
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- 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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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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
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a foundation pit supporting anchorage device and an anchor cable construction method in the foundation pit supporting construction stage of building engineering. The invention comprises an anchorage device, wherein the anchorage device is arranged in an anchorage device fixing device which is arranged in an anchorage device pedestal; the anchor pedestal is provided with a moving groove, the anchor fixing device can slide along the moving groove and is fixed through a plurality of anchor moving devices, and each anchor moving device comprises a bolt. The construction method comprises five steps of anchor cable drilling, anchor cable installation and grouting, waist beam installation, novel foundation pit supporting anchorage installation and anchor cable tensioning. Compared with the traditional anchor cable process, the anchor device used in the construction method can replace a fixed inclined iron and an anchor in the traditional anchor cable process, two processes are optimized into one process, and meanwhile, the device can realize that the anchor moves up and down within a certain range, so that the aim of adjusting the angle of the lower anchor cable is fulfilled; and the anchor cable can be disassembled for recycling after tensioning is completed.
Description
Technical Field
The invention relates to a foundation pit supporting anchorage device and an anchor cable construction method in the foundation pit supporting construction stage of building engineering.
Background
Along with the more and more tense of urban land, more and more foundation ditch engineering need adopt the excavation mode of vertical excavation downwards and the support type of bored concrete pile + anchor rope, and the anchor rope reinforcement construction process construction steps in traditional foundation ditch support do: drilling → installing an anchor cable + grouting → mounting a waist beam → mounting a wedge, mounting an anchor device → tensioning, wherein the anchor device is installed in the tensioning process, the anchor device is fixed on the waist beam by welding the wedge, the inclination angle of the fixed wedge is completely produced in batch according to the design angle in the foundation pit supporting drawing and then is transported to a construction site, and the subsequent adjustment cannot be carried out, but in the process of forming the hole of the anchor cable, the inclination angle of the anchor hole has a certain error in the specification allowable range, the angle of the middle connection wedge cannot be changed, the stress of the anchor cable is not pulled by the axis due to the error allowed by the specification, so that the tensile strength of the anchor cable can not meet the design requirement, and the middle connection wedge is generally formed by welding three steel plates, and the deformation of the wedge is easy to occur in the tensioning process of the anchor cable, has certain quality safety hidden trouble; influenced by the construction process, the wedge is generally welded on the waist beam, in fact, after the subsequent anchor cable is stretched, the internal force of the anchor cable is enough to firmly fix the wedge on the waist beam, the welding process is only convenient for construction, the waste of the process and resources is caused to a certain extent, and a novel foundation pit supporting anchor cable construction method is provided for solving the problem.
Disclosure of Invention
The utility model provides a foundation ditch support ground tackle, includes ground tackle, ground tackle fixing device and ground tackle pedestal, wherein, the ground tackle is installed in ground tackle fixing device, the ground tackle pedestal is provided with the shifting chute, the ground tackle pedestal is provided with and stretches into ground tackle mobile device in the shifting chute, ground tackle fixing device can be in under ground tackle mobile device's the drive adjust the position with sliding along the shifting chute.
Further, the anchor mounting is provided with anchor moving devices located at both sides of the anchor moving device in the moving direction of the anchor fixing device.
Further, the anchor moving device comprises a bolt, the bolt is matched with a threaded hole in the anchor pedestal, and the front end of a screw rod of the bolt abuts against the anchor fixing device.
Further, a plurality of pedestal fixing devices are arranged on one side surface of the anchor pedestal, and each pedestal fixing device comprises a plurality of hooks.
An anchor cable construction method comprises the following steps:
s1, drilling an anchor cable; determining the position according to the construction drawing and setting out, and marking; then, drilling holes by using an anchor cable drilling machine, and arranging hole site drilling holes according to the design of a construction drawing;
s2, mounting an anchor cable and grouting; after drilling to the designed depth, cleaning the hole and then installing an anchor cable; driving the grout stop plug into an orifice, connecting the anchor cable, the grouting pipe and the grouting pump, performing primary grouting, and stopping after the grout overflows from the orifice; after the initial setting of the slurry is finished, performing second grouting until the slurry overflows from the periphery of the orifice; writing down a grouting pipe and an anchor cable joint after grouting;
s3, mounting a waist beam; firstly, chiseling off slurry on the surface of a support pile, a concrete soft layer and concrete protruding out of a wall surface to ensure that a waist beam is indirectly and tightly combined with the support pile; the profile steel combined waist beam is made of double-I-shaped steel, and the clear distance between the double-I-shaped steel meets the requirement that the anchor cable rod body passes straight;
s4, installing a foundation pit supporting anchorage device; firstly, fixing an anchorage device pedestal on the upper edge of the waist beam, then installing an anchorage device fixing device in a moving groove of the anchorage device pedestal, and then installing an anchorage device in the anchorage device fixing device; finally, according to the actual measured angle, the position of the traditional anchorage device is adjusted and fixed by controlling the anchor cable moving device, so that the anchor cable angle is ensured to be consistent with the actual measured anchor hole angle;
s5, tensioning the anchor cable; after the strength of the anchoring section is greater than 80% of the designed strength grade, tensioning the anchor cable; tensioning the anchor cables at intervals, locking the anchor cables according to design requirements after tensioning the anchor cables to a preset multiple of a designed tension value, wherein the tensioning control stress of the anchor cables does not exceed the preset multiple of the ultimate bearing capacity of the anchor cable rod body; and observing the anchor head without displacement and locking according to the locking load.
Further, S1, anchor cable drilling specifically comprises the following steps:
s1.1, firstly, paying off according to a construction drawing to determine the position;
s1.2, ensuring that the positioning error is less than 50mm, the hole inclination error is less than 3 degrees, the inserting positioning error of the steel strand is not more than 30mm, the bottom elevation error is not more than 20cm, and finally marking;
s1.3, designing and arranging hole sites according to a construction drawing, and manually drilling holes by using a simple trolley and an anchor cable drilling machine; a rotary spraying device is arranged in the casing pipe of the foremost section of the drill bit; and then, drilling by using a short drill rod, and then, drilling by using a long drill rod until the designed hole depth is 50 cm. The direction of the holes is vertical to the working surface, and the diameter of the drilled holes is at least 10mm larger than that of the anchor cable.
Further, in the step S2, in the step of mounting the waist beam, before the anchor cable is mounted, an anchor cable bearing capacity test is carried out, and adjustment and optimization are designed according to data feedback.
Furthermore, the grouting material is selected from ordinary silicate cement slurry marked by the number 425, the water cement ratio is 0.5-0.55, and the strength is not less than M20; the first grouting pressure is 0.4-0.6 Mpa; and the secondary grouting pressure is not less than 1.5 Mpa.
Drawings
FIG. 1 is a schematic view of the present anchor assembly;
FIG. 2 is a schematic view of the anchor in use;
fig. 3 is a flow chart of the anchor cable construction method.
Description of reference numerals: 1. anchor, 2, fixing device, 3, anchor moving device, 4, anchor pedestal, 5, pedestal fixing device.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a foundation ditch support ground tackle, includes ground tackle 1, ground tackle fixing device 2 and ground tackle pedestal 4, and wherein, ground tackle 1 installs in ground tackle fixing device 2, and ground tackle pedestal 4 is provided with the shifting chute, and ground tackle pedestal 4 is provided with the ground tackle mobile device 3 that stretches into the shifting chute, and ground tackle fixing device 2 can adjust the position along the shifting chute with sliding under ground tackle mobile device's 3 drive.
The anchor pedestal 4 is provided with anchor moving devices 3 which are positioned at two sides of the anchor moving device 3 in the moving direction of the anchor fixing device 2; the anchor moving device 3 comprises a bolt, the bolt is matched with a threaded hole on the anchor pedestal 4, and the front end of a screw rod of the bolt is abutted against the anchor fixing device 2; a plurality of pedestal fixing devices 5 are provided on one side surface of the anchor pedestal 4, and the pedestal fixing devices 5 include a plurality of hooks.
An anchor cable construction method comprises the following steps:
s1, drilling an anchor cable;
s1.1, firstly, paying off according to a construction drawing to determine the position;
s1.2, ensuring that the positioning error is less than 50mm, the hole inclination error is less than 3 degrees, the inserting positioning error of the steel strand is not more than 30mm, the bottom elevation error is not more than 20cm, and finally marking;
s1.3, designing and arranging hole sites according to a construction drawing, and manually drilling holes by using a simple trolley and an anchor cable drilling machine; a rotary spraying device is arranged in the casing pipe of the foremost section of the drill bit; and then, drilling by using a short drill rod, and then, drilling by using a long drill rod until the designed hole depth is 50 cm. The direction of the holes is vertical to the working surface, and the diameter of the drilled holes is at least 10mm larger than that of the anchor cable.
S2, mounting an anchor cable and grouting; after drilling to the designed depth, cleaning the hole, performing an anchor cable bearing capacity test, designing, adjusting and optimizing according to data feedback, and then installing an anchor cable; the grouting method comprises the following steps of (1) driving a grout stop plug into an orifice for about 30cm, connecting an anchor cable, a grouting pipe and a grouting pump, wherein the first grouting pressure is 0.4-0.6Mpa, and stopping grouting after grout overflows from the orifice; after the initial setting of the slurry is finished, performing secondary grouting, wherein the pressure of the secondary grouting is not less than 1.5Mpa until the blade overflows from the periphery of the orifice; writing down a grouting pipe and an anchor cable joint after grouting; the grouting material uses 425-grade common silicate cement paste, the water cement ratio is 0.5-0.55, and the strength is not lower than M20.
S3, mounting a waist beam; firstly, chiseling slurry on the surface of a supporting pile, a concrete loose layer and concrete protruding out of a wall surface to ensure that a waist beam is indirectly and tightly combined with the supporting pile, connecting a bracket with the supporting pile by adopting a planting bar with the diameter of 14mm, wherein the planting bar is 200mm in length, and compacting gaps between the waist beam and the slope surface between two adjacent piles by using fine stone concrete; the profile steel combined waist beam is made of double-I-shaped steel, and the clear distance between the double-I-shaped steel meets the requirement that the anchor cable rod body passes straight;
s4, installing a novel foundation pit supporting anchorage device; firstly, an anchorage device pedestal 4 is suspended and fixed on the upper edge of a waist beam through a pedestal fixing device 5, then an anchorage device fixing device 2 is arranged in a moving groove in the middle of the anchorage device pedestal 4, and then a traditional anchorage device 1 is arranged in the anchorage device fixing device 2; finally, according to the actual measured angle behind the urban opening, the position of the traditional anchorage device 1 is adjusted and fixed by controlling the anchor cable moving device 3, so that the anchor cable angle is ensured to be consistent with the actual measured anchor hole angle;
s5, tensioning the anchor cable; after the strength of the anchoring section is greater than 80% of the designed strength grade, tensioning the anchor cable; tensioning the anchor cables at intervals, locking the anchor cables according to design requirements after tensioning the anchor cables to 1.1-1.15 times of a designed tensile force value, wherein the tensioning control stress of the anchor cables does not exceed 0.8 time of the ultimate bearing capacity of the body of the anchor cable; and observing the anchor head without displacement and locking according to the locking load.
And after the steps are completed, taking down the anchorage device for cyclic utilization.
The present invention can be easily implemented by those skilled in the art from the above detailed description. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the basis of the disclosed embodiments, a person skilled in the art can combine different technical features at will, thereby implementing different technical solutions.
Claims (8)
1. The utility model provides a foundation ditch support ground tackle, its characterized in that includes ground tackle (1), ground tackle fixing device (2) and ground tackle pedestal (4), wherein, ground tackle (1) is installed in ground tackle fixing device (2), ground tackle pedestal (4) are provided with the shifting chute, ground tackle pedestal (4) are provided with and stretch into ground tackle mobile device (3) in the shifting chute, ground tackle fixing device (2) can be in under the drive of ground tackle mobile device (3) along shifting chute adjustment position with sliding.
2. A foundation pit support anchor according to claim 1, characterised in that the anchor platform (4) is provided with anchor moving means (3) located on either side of the anchor moving means (3) in the direction of movement of the anchor fixing means (2).
3. A foundation pit support anchor according to claim 2, characterised in that the anchor moving means (3) comprises a bolt which engages a threaded bore in the anchor platform (4), the forward end of the bolt bearing against the anchor fixing means (2).
4. A foundation pit support anchor according to any one of claims 1 to 3, wherein: a plurality of pedestal fixing devices (5) are arranged on one side surface of the anchor pedestal (4), and each pedestal fixing device (5) comprises a plurality of claw hooks.
5. An anchor cable construction method is characterized in that: the method comprises the following steps:
s1, drilling an anchor cable; determining the position according to the construction drawing and setting out, and marking; then, drilling holes by using an anchor cable drilling machine, and arranging hole site drilling holes according to the design of a construction drawing;
s2, mounting an anchor cable and grouting; after drilling to the designed depth, cleaning the hole and then installing an anchor cable; driving the grout stop plug into an orifice, connecting the anchor cable, the grouting pipe and the grouting pump, performing primary grouting, and stopping after the grout overflows from the orifice; after the initial setting of the slurry is finished, performing second grouting until the slurry overflows from the periphery of the orifice; writing down a grouting pipe and an anchor cable joint after grouting;
s3, mounting a waist beam; firstly, chiseling off slurry on the surface of a support pile, a concrete soft layer and concrete protruding out of a wall surface to ensure that a waist beam is indirectly and tightly combined with the support pile; the profile steel combined waist beam is made of double-I-shaped steel, and the clear distance between the double-I-shaped steel meets the requirement that the anchor cable rod body passes straight;
s4, installing the foundation pit supporting anchorage device according to any one of claims 1 to 4; firstly, fixing an anchorage device pedestal (4) on the upper edge of a waist beam, then installing an anchorage device fixing device in a moving groove of the anchorage device pedestal (4), and then installing an anchorage device (1) in an anchorage device fixing device (2); finally, according to the actual measured angle, the position of the traditional anchorage device (1) is adjusted and fixed by controlling the anchor cable moving device (3), so that the anchor cable angle is kept consistent with the actual measured anchor hole angle;
s5, tensioning the anchor cable; after the strength of the anchoring section is greater than 80% of the designed strength grade, tensioning the anchor cable; tensioning the anchor cables at intervals, locking the anchor cables according to design requirements after tensioning the anchor cables to a preset multiple of a designed tension value, wherein the tensioning control stress of the anchor cables does not exceed the preset multiple of the ultimate bearing capacity of the anchor cable rod body; and observing the anchor head without displacement and locking according to the locking load.
6. A method of constructing a novel anchor cable for use in a foundation pit support anchor as claimed in claim 3, wherein: s1, anchor cable drilling is specifically divided into the following steps:
s1.1, firstly, paying off according to a construction drawing to determine the position;
s1.2, ensuring that the positioning error is less than 50mm, the hole inclination error is less than 3 degrees, the inserting positioning error of the steel strand is not more than 30mm, the bottom elevation error is not more than 20cm, and finally marking;
s1.3, designing and arranging hole sites according to a construction drawing, and manually drilling holes by using a simple trolley and an anchor cable drilling machine; a rotary spraying device is arranged in the casing pipe of the foremost section of the drill bit; and then, drilling by using a short drill rod, and then, drilling by using a long drill rod until the designed hole depth is 50 cm.
7. The direction of the holes is vertical to the working surface, and the diameter of the drilled holes is at least 10mm larger than that of the anchor cable;
a method of constructing a novel anchor cable for use in a foundation pit support anchor as claimed in claim 3, wherein: and S2, in the step of mounting the waist beam, before the anchor cable is mounted, carrying out an anchor cable bearing capacity test, and designing, adjusting and optimizing according to data feedback.
8. A method of constructing a novel anchor cable for use in a foundation pit support anchor as claimed in claim 3, wherein: the grouting material is selected from ordinary portland cement slurry with the reference number 425, the water cement ratio is 0.5-0.55, and the strength is not less than M20; the first grouting pressure is 0.4-0.6 Mpa; and the secondary grouting pressure is not less than 1.5 Mpa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110990237.9A CN113513031B (en) | 2021-08-26 | 2021-08-26 | Anchor cable construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110990237.9A CN113513031B (en) | 2021-08-26 | 2021-08-26 | Anchor cable construction method |
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| CN113513031A true CN113513031A (en) | 2021-10-19 |
| CN113513031B CN113513031B (en) | 2022-08-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109267A (en) * | 2021-11-12 | 2022-03-01 | 贵州建工集团第一建筑工程有限责任公司 | Anchor cable pore-forming construction pad and anchor cable pore-forming construction method |
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| KR20140065030A (en) * | 2012-11-19 | 2014-05-29 | (주)대성스틸랜드 | Ground anchor head fixing syatem |
| KR20140094178A (en) * | 2013-01-21 | 2014-07-30 | 정성민 | tensile device for tensile angle adjustment and easy to re-tensile |
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| CN212104064U (en) * | 2020-03-18 | 2020-12-08 | 陕西省引汉济渭工程建设有限公司 | Anchor cable tensioning and installing device based on anchor rod |
| CN212714928U (en) * | 2020-06-29 | 2021-03-16 | 中国电建集团贵阳勘测设计研究院有限公司 | Prestressed anchorage cable reinforced structure |
| CN214033704U (en) * | 2020-11-23 | 2021-08-24 | 中冶交通建设集团有限公司 | Anchor rope and anchor backing plate |
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2021
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|---|---|---|---|---|
| JP2000257059A (en) * | 1999-03-05 | 2000-09-19 | Shimizu Corp | Construction method of anchor pedestal and anchor head part |
| KR20140065030A (en) * | 2012-11-19 | 2014-05-29 | (주)대성스틸랜드 | Ground anchor head fixing syatem |
| KR20140094178A (en) * | 2013-01-21 | 2014-07-30 | 정성민 | tensile device for tensile angle adjustment and easy to re-tensile |
| CN203393709U (en) * | 2013-07-29 | 2014-01-15 | 中建八局第二建设有限公司 | Anchor device for prestressed anchor cable |
| CN105970970A (en) * | 2016-05-25 | 2016-09-28 | 中国能源建设集团安徽电力建设第工程有限公司 | Pre-stressed anchor cable supporting construction method for near-railway deep foundation pit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109267A (en) * | 2021-11-12 | 2022-03-01 | 贵州建工集团第一建筑工程有限责任公司 | Anchor cable pore-forming construction pad and anchor cable pore-forming construction method |
| CN114109267B (en) * | 2021-11-12 | 2023-04-18 | 贵州建工集团第一建筑工程有限责任公司 | Anchor cable pore-forming construction pad and anchor cable pore-forming construction method |
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| CN113513031B (en) | 2022-08-30 |
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