CN104452784B - Composite bolt pile used for slope strengthening and construction technique of composite bolt pile - Google Patents

Composite bolt pile used for slope strengthening and construction technique of composite bolt pile Download PDF

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Publication number
CN104452784B
CN104452784B CN201410772933.2A CN201410772933A CN104452784B CN 104452784 B CN104452784 B CN 104452784B CN 201410772933 A CN201410772933 A CN 201410772933A CN 104452784 B CN104452784 B CN 104452784B
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China
Prior art keywords
anchor pole
composite bolt
anchor
pile
crossbeam
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Expired - Fee Related
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CN201410772933.2A
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Chinese (zh)
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CN104452784A (en
Inventor
宋修广
岳红亚
张宏博
吴建清
孙仁娟
王丽娜
孟庆宇
解全
解全一
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Shandong University
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Shandong University
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Priority to CN201410772933.2A priority Critical patent/CN104452784B/en
Publication of CN104452784A publication Critical patent/CN104452784A/en
Application granted granted Critical
Publication of CN104452784B publication Critical patent/CN104452784B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines
    • E02D17/207Securing of slopes or inclines with means incorporating sheet piles or piles
    • 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

Abstract

The invention discloses a composite bolt pile used for slope strengthening and a construction technique of a composite bolt pile. The composite bolt pile comprises bolts and a grouting body, the grouting body is filled around the bolts, each bolt comprises a free section and an anchorage section, and grouting pipes are fixed on one side of the free sections of the bolts and are integrated with the bolts. Geotechnical cloth is arranged on the outer side of the free sections of the bolts, reserved steel bars are transversely fixed at the top end of the anchorage sections of the bolts and fixed with a main crossbeam reinforcing bar, and a crossbeam is erected outside the main crossbeam reinforcing bar. The composite bolt pile can be arranged vertically or diagonally, and tension prestress can be improved effectively by arranging three to six bolts in drilling holes and changing the positions of the anchorage sections in the drill holes. The composite bolt pile has high integral stability and high anti-bending and anti-shearing strength and can be used for strengthening the crest, toe and incline of a roadbed slope in an antiskid manner. The hole diameter of the bolts is large, few drill holes are transversely distributed, and a plurality of steel bars can be arranged in each drill hole at the same time. Arrangement of anchor cables between two sides of the roadbed can be reduced, and the slope can be effectively strengthened.

Description

A kind of Composite Bolt stake for slope reinforcement and its construction technology
Technical field
The invention belongs to road foundation reinforcing engineering field is and in particular to a kind of roadbed side slope reinforcement technology, especially It is a kind of for express highway roadbed side slope reinforcement Composite Bolt stake and its construction technology.
Background technology
Roadbed side slope comes down, breaks away, caving in etc. is that current highway filled-up ground especially high-fill roadbed is common Disease, causes the main cause of these disasters to have heavy showers to wash away, retaining structure intensity is not enough, upper load effect is excessive etc.. In engineering, conventional treatment measures are mainly had in slope top or toe position steel-pipe pile, are noted by boring on side slope surface at present The technology such as slurry technology setting prestressed anchor.Steel-pipe pile technology refers to placing steel tubes in small-sized boring, is then noted by pressure Slurry or concrete perfusion carry out sealing of hole, form Cast-in-place Micropiles, then arrange the integral row of cast-in-place crossbeam shape at top Stake, this technology has that structural integrity is strong, the low advantage of process is simple, cost, becomes conventional disposal in slope treatment at present Technology, but this technology only arranges a steel pipe in bore inner, is not provided with anchor pole, therefore can not apply pre- in structure top end Stress, causes structural strength low, and cannot be used for side slope surface and reinforce.Prestressed anchor pole technology refers in domatic boring, plants Enter anchor pole, after grouting, carry out prestressed stretch-draw, anchoring.This technology is usually used in slope reinforcing, pre- due to applying in anchor pole Stress, makes roadbed side slope assume pressured state, prevents side slope from breakking away.But this technology bore diameter is less, and prestressed anchor is long Degree is big, causes its shearing resistance, bending strength low it is impossible to resist anchor pole moment of flexure and the shearing force that soil body downslide causes.
Chinese patent cn 101220597 a discloses a kind of geotechnical slope retaining structure, by well cementing technology, real The now reinforcing to broken rock mass slope.But this patent is only applicable to the reinforcing of rock mass cut slope, for upper side slope, this reinforcing Technology is inapplicable, and in this reinforcement technique, mini pile can only be in tilted layout it is impossible to be arranged vertically at curb position, the scope of application simultaneously Limited.In work progress, this retaining structure need to carry out drilling construction to each mini pile, and difficulty of construction is big, and for broken Broken serious rock mass, often because vibration causes collapse hole or even the side slope slump of fragmented rock body in work progress, simultaneously this Gear inside configuration reinforcing bar does not apply prestressing force, and consolidation effect is inconspicuous, and side slope easily produces lateral sliding.
Content of the invention
The purpose of the present invention is for overcoming above-mentioned the deficiencies in the prior art, providing a kind of Composite Bolt for slope reinforcement Stake, point oblique and vertical two kinds of forms, by changing anchoring section position in the borehole, stretch-draw prestressing force can be effectively improved, should It is good that Composite Bolt stake has a resistance to overturning, and bending resistance shearing strength is big, can be used for roadbed side slope slope top, toe and domatic anti- Sliding reinforcing.
For achieving the above object, the present invention adopts following technical proposals:
A kind of Composite Bolt stake for slope reinforcement, including anchor pole and injecting cement paste, described injecting cement paste is filled in anchor pole week Enclose, described anchor pole includes free segment and anchoring section, the free segment side of described anchor pole is fixed with Grouting Pipe, described Grouting Pipe and anchor Bar is integral, is provided with geotextiles outside the free segment of described anchor pole, and its effect is parcel free segment anchor pole, makes anchor pole in prestressing force Depart from injecting paste material during tensioning, be easy to tensioning, outside anchor pole, geotextiles preferably arrange 1~2 layer, and use fixation with steel wire.Described anchor The top of the anchoring section of bar is laterally fixed with reserved steel bar.
Described reserved steel bar is fixed with crossbeam cage bar phase, and setting up outside described crossbeam cage bar has crossbeam, and described crossbeam is near Few two Composite Bolt stakes couple together.
Described anchor pole quantity is at least three.
Described anchor pole is anchored by concrete anchor pier and anchor plate.
Described anchor pole a diameter ofArrange 3~6 according to the boring every hole of size.
The freedom length of described anchor pole is identical, and the depth making anchor pole located underground is identical.
The freedom length of described anchor pole is different, and is gradually incremented by, and makes anchor pole depth located underground different.For destruction More side slope, should its objective is, for making anchoring section at different depth, to make anchor force using the different anchor pole of free segment Uniform force, and increase anchor force.Complex process when this structure construction is identical compared with free segment, only in the larger side slope of destructiveness Use.
A kind of construction technology of the Composite Bolt stake for slope reinforcement, comprises the following steps:
Step 1: exploration place, determine the angle of inclination of anchor pile depth, aperture and domatic anchor pile, determine stabilization zone The particular location of domain Composite Bolt stake, pile spacing crossbeam size;
Step 2: holed, vertical form anchor pile boring should be vertical with road surface, and angle of inclination not can exceed that 1 degree;
Step 3: the free segment of anchor pole is wrapped up with geotextiles, places anchor pole to foot of hole;
Step 4: after placing anchor pole, the anchoring section of anchor pole is in the milk, Grouting Pipe is connected with slip casting machine, in injecting cement paste When reaching free segment, stop slip casting;
Step 5: grouting treatment is carried out to the free segment of anchor pole, carries out prestressed tensioning afterwards, first carry out preliminary tensioning Carry out again locking tensioning, tensioning is anchored after completing;
Step 6: after the free segment injecting cement paste of anchor pole reaches preset strength, excavate crossbeam pit, set up template, weld cage bar And reserved steel bar, casting concrete, complete the making of crossbeam.
The invention has the benefit that
1 compared with existing steel-pipe pile technology, and the present invention passes through to arrange anchor pole, can achieve pre- to Composite Bolt stake Stress tension, effectively increases strength of the mixing pile, can be used for domatic position reinforcement, expands this technology application scope.Simultaneously Horizontal reserved steel bar is set at stake top position, welding can be overlapped with crossbeam cage bar it is ensured that the stable connection of pile body and crossbeam Property, the bulk strength of enhancing structure and stability.
2 compared with existing prestressing force mooring rod technique, and pile body diameter of the present invention is big, many prestressed anchors of internal setting, Intensity is big, can cannot resist anchor pole moment of flexure and the shearing force drawback that soil body downslide causes, more by effectively solving prestressed anchor pole technology The stability of side slope can effectively be strengthened.
3 compared with existing prestressing force mooring rod technique, and prestressed anchor anchoring fragment position mutually staggers, it can be avoided that When drawing, anchoring section intensity deficiency causes anchor pole to be extracted, and improves stretch-draw prestressing force, enhances column rigidity.Dowel anchor of the present invention Maintenance puts difference, effective anchoring of achievable dowel, increases bulk strength.
4th, anchor pole aperture of the present invention is big, and lateral attitude arrangement drilling hole amount is few, and each boring can place many simultaneously Reinforcing bar, can reduce roadbed horizontal between anchor cable arrangement, realize effective reinforcing of side slope simultaneously;Internal reinforcing bar applies in advance should Power, integral rigidity is big, can be used for a gear of curb position, plays the effect of similar steel-pipe pile.
Brief description
Fig. 1 is the anchor pile structural representation in same depth for the anchoring section of the present invention;
Fig. 2 is anchor pile structural representation at different depth for the anchoring section of the present invention;
Fig. 3 is the anchor pile reinforcing side slope schematic diagram in same depth for the anchoring section of the present invention;
Fig. 4 is the partial enlarged drawing at a in Fig. 3;
Fig. 5 is the partial enlarged drawing at b in Fig. 3;
Fig. 6 is the schematic diagram of anchor pile reinforcing side slope at different depth for the anchoring section of the present invention;
Fig. 7 is the schematic diagram that between the present invention two Composite Bolt stake, crossbeam connects;
In figure, 1, anchor pole, 2, free segment, 3, anchoring section, 4, injecting cement paste, 5, Grouting Pipe, 6, geotextiles, 7, concrete anchor Pier, 8, anchor plate, 9, reserved steel bar, 10, crossbeam, 11, crossbeam cage bar.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
As shown in figs. 1-7, for the Composite Bolt stake of slope reinforcement, including anchor pole 1 and injecting cement paste 4, injecting cement paste 4 is filled in Around anchor pole 1, anchor pole 1 includes free segment 2 and anchoring section 3, and free segment 2 side of anchor pole 1 is fixed with Grouting Pipe 5, Grouting Pipe 5 with Anchor pole 1 is integral, is provided with geotextiles 6 outside the free segment 2 of anchor pole 1, and anchor pile arrangement pitch is 1.5~2m, anchoring depth For 1.5~4m, reserved steel bar 9 is set at anchoring section 3 top, welds with crossbeam cage bar 11.Crossbeam cage bar 11 outside sets up horizontal stroke Beam 10, two Composite Bolt stakes are coupled together by crossbeam 10.Anchor pole 1 is hrb type spiral, and intensity is not less than hrb335, directly Footpath isLength is identical with drilling depth, arranges 3~6 according to the boring every hole of size.Anchor pole 1 passes through concrete Anchor pier 7 and anchor plate 8 are anchored.
Bore diameter is 15~30cm, and its depth should exceed slide surface 2~3m, and boring should be carried out at borehole cleaning after completing Reason, adopts slip casing by pressure, grouting pressure controls in 0.4~1.0mpa in boring.Grouting method preferably adopts single-pipe grouting or multitube Slip casting.Single-pipe grouting refers to arrange a Grouting Pipe in pile center, can adopt sleeve grouting process.Multitube slip casting refers to every anchor The Grouting Pipe that an equal length joined by bar carries out slip casting.
Grouting Pipe 5 is sleeve valve barrel grouting steel pipe, a diameter of 2~4cm, and length is identical with anchor pole 1, and welds with anchor pole 1 Integral, punch every 10~20cm length in anchoring section 3, aperture is 3~5mm.Grouting Pipe 5 slip casting end should be carried out at sealing Reason, then be connected with slip casting machine.
Injecting paste material is cement mortar, and mortar adopts fine sand or ultra fine sand configuration, and label is not less than m30, and the ratio of mud is 0.8 ~1.2, the mass fraction of sand is less than 30%.
Geotextiles 6 are common building geotextiles, and its effect is parcel free segment anchor pole, makes anchor pole in prestressed stretch-draw Depart from injecting paste material, be easy to tensioning, outside anchor pole, geotextiles preferably arrange 1~2 layer, and use fixation with steel wire.
Crossbeam 10 is reinforced concrete structure, and its effect is multiple anchor piles to be connected into an entirety, anchor rod anchored After completing, in anchoring end along longitudinally excavating pit, reinforcement placing is simultaneously welded with reserved steel bar, places template and pours coagulation Soil, concrete strength is more than c40.
For the construction technology of the Composite Bolt stake of slope reinforcement, comprise the following steps:
The first step, should survey place first, determine that anchor pile is deep according to field condition, landslide position, destroyed area size The angle of inclination of degree, aperture and domatic anchor pile, carries out place surveying setting-out afterwards, determines reinforcing area Composite Bolt stake The parameters such as particular location, pile spacing crossbeam size.
Second step: rig is in place, is holed, and vertical form anchor pile boring should be vertical with road surface, and angle of inclination can not More than 1 degree, in order to reach more preferable anchoring effect, foot of hole answers increasing section, and boring carries out borehole cleaning process after completing.
3rd step, places prestressed anchor 1, and anchor pole 1 should reach foot of hole, before placing anchor pole 1, should be first by freely Section 2 is wrapped up with geotextiles 6, should install with the anchor pole 1 in hole simultaneously, can arrange cableway to ensure between anchor pole during installation Spacing.
4th step: after placing anchor pole 1, anchoring section 3 is in the milk, Grouting Pipe 5 is connected with slip casting machine, in injecting cement paste 4 When reaching free segment 2, stop slip casting.
5th step: after anchoring section 3 injecting cement paste semi-finals degree reach design strength be more than 80% after, free segment 2 is carried out at grouting Reason, carries out prestressed tensioning afterwards, during the formal tensioning of anchor pole, should be stretched to the 105%~110% of design load, then by rule Definite value carries out being anchored after locking tensioning completes.
6th step: after free segment injecting cement paste 4 reaches some strength, excavate concrete beam 10 pit, set up template, welding Cage bar and reserved steel bar 9, casting concrete, complete the making of crossbeam.
Embodiment 1:
As shown in figure 1, being vertical form anchor pile, reinforcement design scheme parameter is determined according to scene, anchoring section is same Depth Composite Bolt stake, pushes up range finding unwrapping wire on slope first, determines bore position, and according to the boring of design parameter, borehole cleaning is complete Place anchor pole after becoming, by sleeve valve grouting technology grouting sealing of hole, after open die forging injecting cement paste reaches some strength, excavate crossbeam Pit, sets up template, welding cage bar and reserved steel bar, casting concrete, completes the making of crossbeam.
Embodiment 2:
As shown in figure 3, vertical form anchor pile and oblique form prestressed anchor pile, Design of Reinforcement side is determined according to scene Case parameter, anchoring section, in same depth Composite Bolt stake, first in domatic range finding unwrapping wire, determines bore position, according to design Strategy parameter is holed, and borehole cleaning places anchor pole after completing, and is in the milk in anchoring section by sleeve valve grouting technology, treats that injecting cement paste reaches After design strength 80%, grouting treatment is carried out to free segment, afterwards prestressed stretch-draw and anchoring are carried out to anchor pole.Open die forging slip casting After body reaches some strength, excavate crossbeam pit, set up template, welding cage bar and reserved steel bar, casting concrete, complete crossbeam Making.
Embodiment 3:
As shown in fig. 6, being oblique form prestressed anchor pile, reinforcement design scheme parameter, anchoring section are determined according to scene Composite Bolt stake at different depth, first in domatic range finding unwrapping wire, determines bore position, according to the boring of design parameter, Borehole cleaning places anchor pole after completing, and is in the milk in anchoring section and free segment by sleeve valve grouting technology, treats that injecting cement paste reaches design After intensity 80%, anchor pole is carried out with prestressed stretch-draw and anchoring, excavate crossbeam pit, set up template, welding cage bar and reserved steel Muscle, casting concrete, complete the making of crossbeam.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.

Claims (7)

1. a kind of Composite Bolt stake for slope reinforcement, is characterized in that, including anchor pole and injecting cement paste, described injecting cement paste is filled in Around anchor pole, described anchor pole includes free segment and anchoring section, and the free segment side of described anchor pole is fixed with Grouting Pipe, described slip casting Pipe is integral with anchor pole, is provided with geotextiles, the top of the anchoring section of described anchor pole is laterally fixed outside the free segment of described anchor pole There is reserved steel bar;
Described reserved steel bar is fixed with crossbeam cage bar phase, and setting up outside described crossbeam cage bar has crossbeam;Described crossbeam will at least two Individual Composite Bolt stake couples together.
2. Composite Bolt stake as claimed in claim 1, is characterized in that, described anchor pole quantity is at least three.
3. Composite Bolt stake as claimed in claim 1, is characterized in that, described anchor pole is carried out by concrete anchor pier and anchor plate Anchoring.
4. Composite Bolt stake as claimed in claim 1, is characterized in that, a diameter of φ 20 ~ φ 32 mm of described anchor pole.
5. Composite Bolt stake as claimed in claim 1, is characterized in that, the freedom length of described anchor pole is identical.
6. Composite Bolt stake as claimed in claim 1, is characterized in that, the freedom length of described anchor pole is different, and gradually passs Increase.
7. the construction technology of the Composite Bolt stake as described in any one of claim 1-6, is characterized in that, comprise the following steps:
Step 1: exploration place, determine the angle of inclination of anchor pile depth, aperture and domatic anchor pile, determine that reinforcing area is multiple Close particular location, the pile spacing crossbeam size of anchor pile;
Step 2: holed, vertical form anchor pile boring should be vertical with road surface, and angle of inclination not can exceed that 1 degree;
Step 3: the free segment of anchor pole is wrapped up with geotextiles, places anchor pole to foot of hole;
Step 4: after placing anchor pole, the anchoring section of anchor pole is in the milk, Grouting Pipe is connected with slip casting machine, reaches in injecting cement paste During free segment, stop slip casting;
Step 5: grouting treatment is carried out to the free segment of anchor pole, carries out prestressed tensioning afterwards, first carry out preliminary tensioning and enter again Row locking tensioning, tensioning is anchored after completing;
Step 6: after the free segment injecting cement paste of anchor pole reaches preset strength, excavate crossbeam pit, set up template, welding cage bar and pre- Stay reinforcing bar, casting concrete, complete the making of crossbeam.
CN201410772933.2A 2014-12-12 2014-12-12 Composite bolt pile used for slope strengthening and construction technique of composite bolt pile Expired - Fee Related CN104452784B (en)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
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CN107034903B (en) * 2017-03-30 2019-05-28 赣州有色冶金研究所 A kind of construction method of reinforcement device
CN108104854B (en) * 2018-01-05 2019-06-28 中铁五局集团第四工程有限责任公司 A kind of grouting construction method of quick tensioning anchor cable
CN110747813B (en) * 2019-10-23 2021-08-24 郴州市水电建设公司 Waterproof construction method for hydraulic engineering
CN112878358A (en) * 2020-09-13 2021-06-01 湖南城市学院 Existing retaining wall reinforcing construction method and reinforcing structure thereof
CN113279416A (en) * 2021-04-23 2021-08-20 游永华 Highway side slope reinforcing apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289626A (en) * 1989-03-27 1994-03-01 Kajima Corporation Foundation anchor and method for securing same to a foundation
CN1319152A (en) * 1998-08-06 2001-10-24 安东尼·唐纳德·巴利 Ground anchorage
CN201272968Y (en) * 2008-09-25 2009-07-15 中国京冶工程技术有限公司 Combined anchorage system
CN102352632A (en) * 2011-07-29 2012-02-15 重庆大学 Anchor rod sheet pile combined structure and method for reinforcing high filling body on one side of slope
CN103603369A (en) * 2013-12-09 2014-02-26 中国石油集团工程设计有限责任公司 Construction method of anchor pile counterfort retaining wall
CN204311463U (en) * 2014-12-12 2015-05-06 山东大学 A kind of Composite Bolt stake for slope reinforcement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289626A (en) * 1989-03-27 1994-03-01 Kajima Corporation Foundation anchor and method for securing same to a foundation
CN1319152A (en) * 1998-08-06 2001-10-24 安东尼·唐纳德·巴利 Ground anchorage
CN201272968Y (en) * 2008-09-25 2009-07-15 中国京冶工程技术有限公司 Combined anchorage system
CN102352632A (en) * 2011-07-29 2012-02-15 重庆大学 Anchor rod sheet pile combined structure and method for reinforcing high filling body on one side of slope
CN103603369A (en) * 2013-12-09 2014-02-26 中国石油集团工程设计有限责任公司 Construction method of anchor pile counterfort retaining wall
CN204311463U (en) * 2014-12-12 2015-05-06 山东大学 A kind of Composite Bolt stake for slope reinforcement

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