CN106284341A

CN106284341A - A kind of prestress anchorage cable hillside wall construction technology

Info

Publication number: CN106284341A
Application number: CN201610698133.XA
Authority: CN
Inventors: 包新永; 姚亮; 杜景阳; 李建林; 庞炯和
Original assignee: NANJING BRANCH CHINA 19TH METALLURGICAL Corp
Current assignee: China 19th Metallurgical Corp
Priority date: 2016-08-21
Filing date: 2016-08-21
Publication date: 2017-01-04
Anticipated expiration: 2036-08-21
Also published as: CN106284341B

Abstract

The present invention relates to provide a kind of civil engineering construction field, it is provided that a kind of prestress anchorage cable hillside wall construction technology, for building prestress anchorage cable hillside wall on hillside；A kind of prestress anchorage cable hillside wall construction technology, carries out earth's surface and cuts, after pumping equipment, carries out in the following order: a. massif side slope stage excavation from top to bottom, each layer height 2～3m；After the most each stage excavation, carry out this grade of hillside construction prestressed cable immediately；C., after the construction prestressed cable of every one-level hillside, this grade of hillside wall construction is carried out immediately；D., after every one-level hillside wall is all constructed, repeat a c and enter the wall construction of next stage hillside.

Description

A kind of prestress anchorage cable hillside wall construction technology

Technical field

The present invention relates to provide a kind of civil engineering construction field, it is provided that a kind of prestress anchorage cable hillside wall construction technology, For building prestress anchorage cable hillside wall on hillside.

Background technology

Hillside wall is widely used in civil engineering, refer to be arranged on the soil body one end bearing Roadbed Soil or the hillside soil body, Prevent from banketing or the structure of soil deformation unstability.According to hillside wall to arrange position different, be divided into curb wall, embankment wall, road Moat wall and hillside wall etc..It is arranged on hillside, the cover layer soil body that supporting hillside may cave in or the retaining wall of broken rock It is referred to as hillside wall.

Hillside wall, because its safety classes of building structures requires higher, basic environment classification is poor, and earthquake resistant engineering is set up defences strong Degree, basic seismic acceleration are relatively big, and site category has the features such as substantially restriction for construction, has higher for construction technology Requirement.

By drilling through soft stratum or sliding surface, one end (anchor pole) is anchored in hard rock stratum (title Inner bolt head), Then carry out stretch-draw at another free end (claiming outer anchor head), thus rock stratum applied pressure unstable rock mass is anchored, This method claims prestress anchorage cable.Obviously, prestress anchorage cable be fixed on by outer end domatic, the other end be anchored at sliding surface with Through the prestress wire in slope sliding face in interior rock mass stability, on sliding surface, directly produce sliding resistance, increase antiskid Frictional resistance, makes structural plane be in impaction state, to improve the globality of slope rock mass, thus fundamentally improves the power of rock mass Learn performance, efficiently control the displacement of rock mass, promote to stabilize it, reach to renovate concordant, landslide and crag, the purpose of danger stone.By In prestress anchorage cable, there is above-mentioned good action effect, widely should obtain during especially hillside is built by force in civil engineering With.

Summary of the invention

It is an object of the invention to provide a kind of prestress anchorage cable hillside wall construction technology, for building prestressing force on hillside Anchor cable hillside wall.

It is an object of the invention to be achieved through the following technical solutions: a kind of prestress anchorage cable hillside wall construction technology is to do Good earth's surface is cut, after pumping equipment, carry out in the following order:

A. massif side slope stage excavation from top to bottom, each layer height 2～3m；

After the most each stage excavation, carry out this grade of hillside construction prestressed cable immediately；Specific construction flow process is, by fixed Position, preparation of construction, anchor hole bore make, anchor cable system peace, anchor hole slip casting, construction of frame beam, tensioning fixation, examination sealing off and covering anchorage are sequentially carried out；

C., after the construction prestressed cable of every one-level hillside, this grade of hillside wall construction is carried out immediately: hillside wall includes being cast in Basis on hillside, the wallboard on the basis of being connected in, it is positioned at the rib post that wallboard side and wallboard are connected；The work of hillside wall construction Process flow is: unwrapping wire, positioning rib post position, and anchor cable rib post is reinforced, and colligation makes rib post reinforcing bar and hillside wall reinforcing bar, formwork Plate, cast-in-situ reinforced concrete hillside wall；Wallboard should be layered in above section above ground level and arrange spilled water hole；

D., after every one-level hillside wall is all constructed, repeat a-c and enter the wall construction of next stage hillside.

The invention has the beneficial effects as follows: carry out this grade of hillside after using massif side slope stage excavation from top to bottom immediately and in advance should Power anchor cable construction, fundamentally improves the mechanical property of rock mass, efficiently controls the displacement of rock mass, promotees to stabilize it, and reaches whole Control concordant, landslide and crag, the purpose of danger stone, provide solid for follow-up this grade of hillside wall construction on this excavation layer carried out Physical basis；Excavate one layer, construct one layer, in order to the construction quality of grading control hillside wall.

As the technical scheme that the present invention is improved, location, unwrapping wire:

Execution State Bureau of Technical Supervision, the Ministry of Construction combine the certainty of measurement standard of " Code for engineering surveying " defined of issue, abide by Follow and overall control local, high-grade control low-grade plane control principle, carry out positioning, unwrapping wire；Location, unwrapping wire comprise as follows Content:

Control point is set up and is measured: during plane control, releases each major axis point with total powerstation, then surveys with theodolite Angle；Combine steel ruler with theodolite to carry out checking and correct, meet the Controling network axle nomographic chart that compilation after construction precision needs is detailed；Root Control point is set up according to needs；

Measure the control of main shaft: when survey sets main shaft, use method of polar coordinates, use tape measure to measure minor axis, after bed course pours By theodolite, axis is thrown on bed course；

Surveying setting-out: measure unwrapping wire according to design drawing, the data determined by drawing release foundation ditch sideline on the spot, in construction Middle measurement must also tracing and monitoring, each layer has dug all tackles cross dimensions and absolute altitude carries out a repetition measurement；

Test line: after surveying setting-out, line should be tested by special messenger, test line qualified rear notice survey supervision scene repetition measurement；

The protection at control point: be provided for going along with sb. to guard him the guardrail at control point in control point surrounding.

As to further improved technical scheme of the present invention, anchor hole bores and makes:

Anchor hole bores makes employing anchoring drilling machine pore-forming, air DTH drilling, air deslagging；

According to position, measuring hole, hillside, accurate rigging up, carry out seat in the plane adjustment；

In drilling process to the formation variation in each hole, creep into state, groundwater condition performs construction note；In case of with caving in body When layer is loose, broken, uses the drilling technology of sleeve pipe follow-up, make boring not collapse；When creeping into phenomenon such as collapse hole shrinkage cavity, vertical I.e. stopping to bore, carry out grouting for braced wall process (grouting pressure 0.1～0.2MPa) in time, after cement mortar initial set, cleaning bottom of hole bores again Enter；

Drilling hole position, hole depth, gradient meet design requirement, and hole position error is not more than 20mm, aperture tolerance 0～10mm；For Guaranteeing hole depth, hole depth should exceed Soil Anchor Design length and be not more than 2% not less than 0.5m, boring gradient；

Creep into after reaching projected depth, it is impossible to stop immediately to bore, it is desirable to steady brill 1～2 minute；After boring completes, use high pressure empty Rock dust in hole and water body are all removed outside portalling by gas (blast 0.2～0.4MPa)；In addition to the rock mass that relative rigid is complete, must not Use high pressure water washing；If chance anchor hole has artesian water to flow out, dowel and slip casting can be pacified down after hydraulic pressure, the water yield diminish, must When wanting, suitable position arranges osculum process around；When designing requirement and processing anchor hole accumulated inside water body, use grouting envelope Stifled secondary drilling method processes；

Verifying under conditions of using the other station of design aperture, drill bit and standard drill pipe management at the scene in aperture, hole depth inspection, it is desirable to tests During hole, drill bit smooth-going advances, and does not produce impact or shake, and drilling tool is tested and sent length to meet design hole depth, moves back brill and requires suitable Freely, test with high pressure wind do not exist obvious splashing dirt quarrel and water body phenomenon；Require check position, anchor hole hole, inclination angle and orientation simultaneously, After all anchor hole construction subitem work are qualified, i.e. it is believed that anchor hole bores, to make inspection qualified.

As to further improved technical scheme of the present invention, anchor cable system is pacified, i.e. anchor pole makes and installs:

Anchor rod body carries out oil removing, processing of rust removing before assembling；Anchor rod body free segment carries out preservative treatment by following requirement for anticorrosion: Brush bituminous ship bottom paint uses pitch fibers cloth to load in sleeve pipe after swathing three layers；In the 200mm length range of free segment sleeve pipe two ends Use butter filling, outer grafting engineering immobilization with adhesive tape；

Steel strand wires flat arrangement, is respectively provided with lock ring ring and each one of isolating frame along body of rod axis direction at interval of 1.0m-1.5m, Making anchoring section steel strand wires is nodular；Anchor cable overcoat sets bit slice, makes the steel strand wires can in boring between two parties, it is ensured that the sand of anchor rod body Slurry protective layer, not less than 25mm, makes anchor cable and mortar form an entirety with hole wall；Anchor cable head is burn-on and is customized steel anchor head guide cone；

Pulling force decentralized anchor rod body should first be fabricated to unit bolt, then is assembled into composite anchor-rod by 2 unit bolts；Respectively The exposed junction of unit bolt, should carry out labelling, and before anchor pole stretch-draw, this labelling must not damage；

Supporting body should be firm with steel strand wires fixing, and must not damage anticorrosion oils and fats and the outsourcing protective material of steel strand wires；

Finished product anchor pole must carry out fundamental test and proof test before use；Basic experiment, every kind of anchor pole for fundamental test Quantity the most should be less than 3；Proof test, the anchor pole quantity for proof test takes the 5% of each type anchor pole sum, and all Must not be less than 5, maximum finder charge takes 1.5 times of anchor pole axial tension standard value Nak；

When laying the body of rod, should prevent from turning round pressure and bending, Grouting Pipe should together put into boring with the body of rod；Must not damage when laying the body of rod Bad anticorrosive coat, must not affect normal slip casting operation.

As to further improved technical scheme of the present invention, anchor hole slip casting:

Should be in time to anchor hole cement injection mortar, i.e. anchor hole slip casting after laying the body of rod；

Selecting the cement mortar of corresponding label as required, cement mortar each component match ratio passes through experimental configuration, as required Appropriate early strength agent can be participated in；Making cement mortar specimen strength test is answered before perfusion；

Anchor hole slip casting uses hole-bottom slurry-injection method, midway must not stop slurry, and grouting pressure is 0.6～0.8MPa, and mortar injection should be full Closely knit, when aperture has serosity to emerge, stop slip casting；Slip casting is complete for the first time, and after cement mortar solidification shrinkage, aperture should be carried out Mend slurry；Grouting serous fluid should stir, with stir with, and be finished before initial set；

After slip casting terminates, clean Grouting Pipe, grouting gun and slip casting sleeve pipe, in work progress, carry out slip casting record；

It is anchoring body that cement mortar after solidification and the cement mortar after solidification wrap up in the component of deposited anchor pole formation.

As to further improved technical scheme of the present invention, anchor pole stretch-draw and rock bolt, i.e. tensioning fixation:

The anchor head pedestal bearing plate being embedded in the wall of hillside should be installed smooth, firm, and pressure-bearing surface should be vertical with anchor hole axis；

Anchor pole stretch-draw should be carried out after anchoring body reaches the 80% of design strength, and anchor pole tension sequence should avoid close anchor pole mutual Impact；

Before the formal stretch-draw of anchor pole, by 0.1-0.2 times of axial tension standard value Nak to steel strand wires stretch-draw 1-2 time one by one, make steel strand wires Straight by root, each location contacts is tight, then carries out the overall first stretch-draw of whole bundle；Integral tension multistage can be carried out, just by twice Secondary final tension tonnage is the 50%-70% of Soil Anchor Design anchoring load；When mortar strength reaches design strength in hole, carry out end Secondary stretch-draw, anchor pole is stretched to during 1.10Nak keep 10min, and then off-load carries out rock bolt to 1.0Nak；

After last anchor pole stretch-draw completes, carry out rock bolt immediately, i.e. with intermediate plate, anchor cable is locked on anchorage；Tensioning lock After Ding, anchor cable exposing steel strand wires and reserves 5cm length, remaining uses hand-held abrasive wheel cutting machine to cut and according to anchor pole anchor head drawing Seal anchor head；The anchorage of anchor head should eliminate rust, be coated with corrosion resistant coating three degree；Sealing off and covering anchorage concrete is the most bonding with concrete members, sealing off and covering anchorage end And each connecting portion should be able to bear the hydrostatic pressure of 10kPa.

As to further improved technical scheme of the present invention, during the construction of hillside wall, bracket, bracket should be set at construction joint End face should be 50cm with the discrepancy in elevation of construction joint, should be cut in time by bracket after the wall form removal of hillside, and with mortar by roughened surface Floating process；Rib post, when the pre-buried transition conduit in anchor cable hole position is conflicted with reinforcing bar, adjusts bar spacing and ensures anchor cable preformed hole position Accurate.

As to further improved technical scheme of the present invention, when colligation makes rib post reinforcing bar and hillside wall reinforcing bar, in advance Leave the reinforcing bar of an aspect, in order to reinforcement welding.

As to further improved technical scheme of the present invention, as required, select the concrete of corresponding label, carry out and mix Solidifying soil pouring cast-in-situ reinforced concrete hillside wall；

Concrete is forbidden directly to impact template during concreting；Make firm by ramming and vibrate with plug-in type dither, remove in time and shake Smash the bleeding that process produces；

Before pouring vertical xoncrete structure, bottom should first be filled out with thick the connecing with the cement mortar of label with concrete of 50～100 mm Seam (in case " rotten foot ")；

The watering of concrete is smash layering and is carried out, and every layer thickness, less than 1.5 times of vibrating head effective length, connects raft up and down and must not exceed The concrete presetting period, strict control heavy in real time between, the intensive place of reinforcing bar, should avoid pouring and rest or relieve, it is ensured that concrete water puddling Real；

After concrete placings, water seasoning.

As to further improved technical scheme of the present invention, wallboard should be layered in above section above ground level and arrange sluicing Hole, is crisscross arranged up and down, pre-buried diameter 100mmPVC pipe in hole, a length of 500mm, and outer oblique 5%, spilled water hole level interval For 2.0m, vertical interval is 1.5m, and spilled water hole penetrates concrete body, loaded filter disposed behind, makees the diameter cobble filter not less than 50mm Water-water reactor capsule, the outlet of next row spilled water hole 300mm above ground level；Expose spilled water hole layout and meet drawing requirement, must not occur The phenomenon that height differs, spacing is uneven.

Accompanying drawing explanation

Fig. 1 is the site plan of prestress anchorage cable hillside wall；

Fig. 2 is the facade layout drawing of prestress anchorage cable hillside wall；

Fig. 3 is prestress anchorage cable hillside wall site layout project schematic diagram in mine；

Fig. 4 is that anchor pole protects full-page proof schematic diagram；

Fig. 5 is enlarged drawing at 1 in Fig. 4；

Fig. 6 is the structural representation of A type anchor pole；

Fig. 7 is the structural representation of c-type anchor pole；

Fig. 8 is structural representation during spacer installation；

Fig. 9 is 1-1 section construction schematic diagram in Fig. 2；

Figure 10 is 2-2 section construction schematic diagram in Fig. 2；

Figure 11 is 2a-2a section construction schematic diagram in Fig. 2；

Figure 12 is 3-3 section construction schematic diagram in Fig. 2；

Figure 13 is 4-4 section construction schematic diagram in Fig. 2；

Figure 14 is 5-5 section construction schematic diagram in Fig. 2；

Figure 15 is 6-6 section construction schematic diagram in Fig. 2；

Figure 16 is 7-7 section construction schematic diagram in Fig. 2；

Figure 17 is 8-8 section construction schematic diagram in Fig. 2；

Figure 18 is 9-9 section construction schematic diagram in Fig. 2；

Figure 19 is 10-10 section construction schematic diagram in Fig. 2；

Figure 20 is 11-11 section construction schematic diagram in Fig. 2；

Figure 21 is 12-12 section construction schematic diagram in Fig. 2；

Figure 22 is 13-13 section construction schematic diagram in Fig. 2；

Figure 23 is 14-14 section construction schematic diagram in Fig. 2；

Figure 24 be basis one section, two-stage nitration, five sections, six sections of arrangement of reinforcement schematic diagrams；

Figure 25 is three sections, four sections of arrangement of reinforcement schematic diagrams on basis；

Figure 26 is the arrangement of reinforcement schematic diagram of wallboard；

Figure 27 is the arrangement of reinforcement schematic diagram of capping beam.

Detailed description of the invention

The wall construction of factory's thick grading hillside is selected to be tool with regard to certain distance tape transport system and ore-sorting system civil engineering below Body example, combining accompanying drawing, the invention will be further described:

Seeing shown in Fig. 1, Fig. 2, Fig. 3, selecting factory's thick grading hillside wall is that prestress anchorage cable hillside below wall 1(can be also simply referred to as mountain Slope wall), the design life of this engineering is 50 years, and safety classes of building structures is two grades, and superstructure environment category is two A () class, basic environment classification is two (a) class, and basic engineering grade is second class；This earthquake resistant engineering fortification intensity is 8 degree, designs base This seismic acceleration is 0.25g, and classification of providing fortification against earthquakes is Class C, and classification of design earthquake is first group, and site category is II class；Not Through technical appraisement or design license, the purposes of structure must not be changed and use environment.

Hillside is complete middle air slaking strata structure.

Prestress anchorage cable hillside wall 1 is positioned on the hillside in southern side, mine 2, is generally folded to east again by north to south.Select factory thick Grading hillside wall northeast side is between coarse crushing 3, and side, southwest is raw ore stockyard, unloads ore deposit platform 4, and between coarse crushing, the west side of 3 is 2 trestles 8, between coarse crushing 3, raw ore stockyard, west side to the prestress anchorage cable hillside wall 1 that unloads ore deposit platform 4 be 1 trestle 9.

Prestress anchorage cable hillside wall 1, the long 96.154m of axial dimension, high 15.8m.The rib post 6 of hillside wall, wallboard 5, basis 12 is reinforced concrete structure, and anchor pole 7 uses dispersed pressure anchor.

The elastic deformation that may cause because of the active force by hillside in view of hillside wall and prestress anchorage cable free segment Elastic deformation, hillside wall tilts to direction, hillside with the gradient of 1:0.05.

Concrete: rib post 6, wallboard 5, basis 12 use C35 concrete.

Reinforcing bar: HPB300(has φ 8, φ 10, φ 12) and HRB400(have 13,16,22,25,29).

Anchor hole is in the milk: anchor hole uses the grouting of M30 cement mortar, and sand preferably uses medium sand, the normal silicate of cement 32.5MPa Cement.

One. preparation of construction

1, technique preparation

It is familiar with construction drawing, understands field condition, work out detailed arrangement and method for construction.

Conscientiously examine construction drawing, query present in record drawing, carry out drawing and record from audits and compliance.

Site operation personnel and director are carried out safety and environmental protection tell somebody what one's real intentions are and confide a technological secret.

Establishment construction material plan also reports ministry of materials.

Test prepares: anchorage cable materials performance test, reinforcement property are tested；Slightly, fine aggregate performance test；Mortar, concrete coordinate Than test.Anchor pole spare and accessory parts are tested by criticizing by regulation, and anchor pole to make in building site job shop, and trial assembly is joined, to guarantee Quality.

2, on-the-spot preparation

Production facility is by specialty Relatively centralized, and arranges close proximity to construction point, performs the pool rule of construction as possible in the venue Draw.

Planning position, circulation material stockyard, reinforcing bar, carpenter process place.

Carry out on-the-spot handing-over to prepare, set up SURVEYING CONTROL NETWORK, conscientiously carry out axis and absolute altitude controls, draw the survey of building Amount location figure, the department such as journalism master, management appraises and decides accreditation.

3, material and facility prepare

Before going into operation, good material is marched into the arena preparation, specifies material and concentrates stowed location.

Cubic metre of earth facility, cargo carrier, machining machine and tool, concrete placings facility, reinforcement installation instrument and the selection of facility, quantity, Report to a higher authorities for approval, preparedness plan of marching into the arena.

4, spot plane is arranged

Site layout project

Hurt sb.'s feelings for preventing high-altitude object from falling, and stop idler's crossing construction region, take selecting factory's thick grading hillside surrounding If security isolation enclosure wall, enclosure wall uses steel pipe to set up, and safety net is isolated, and fixedly secures, and hangs striking caution board.

Concrete uses own mixing plant to produce concrete, and concreting uses concrete hopper auxiliary to pour.

Construction road

Construction road utilizes Ore Transportation main line and construction temporary road to be transported to job site, will keep that the road is clear.

Construction water

Construction industrial water is mainly used in concrete curing, job site hydromining water pipe artesian water.

Power supply for construction

Site operation electricity consumption is mainly used in reinforcing bar, form work engineering, concrete placings and illumination, and construction temporary electricity uses own diesel oil to send out Motor (100kw) generates electricity.

Two, main construction method (seeing again shown in Fig. 9-Figure 23)

1, carry out earth's surface to cut, after pumping equipment, carry out in the following order:

A. massif side slope stage excavation from top to bottom, each layer height 2～3m.In diagram, by terrace line 10 before the wall wall of hillside Down, along substrate excavation line 11 stage excavation；

After the most each stage excavation, carry out this grade of hillside wall construction prestressed cable immediately；Specific construction flow process is, by fixed Position, preparation of construction, anchor hole bore make, anchor cable system peace, anchor hole slip casting, construction of frame beam, tensioning fixation, examination sealing off and covering anchorage are sequentially carried out；

C., after the construction prestressed cable of every one-level hillside, this grade of hillside wall construction is carried out immediately: hillside wall includes being cast in Basis 12 on hillside, is connected in the wallboard 5 on basis 12, is positioned at wallboard 5 side and the connected rib post 6 of wallboard 5；Hillside wall The technological process of construction is: unwrapping wire, positioning rib post position, and anchor cable rib post is reinforced, and colligation makes rib post reinforcing bar and hillside wall steel Muscle, formwork supporting plate, cast-in-situ reinforced concrete hillside wall；Wallboard should be layered in above section above ground level and arrange spilled water hole.

When anchor cable rib post is reinforced, by associated specifications, anchor cable is carried out stretch-draw.

When carrying out colligation rib post and barricade reinforcing bar, it should be noted that the reinforcing bar of next aspect reserved, in order to reinforcement welding.

In this case, the wall top of hillside wall is additionally provided with capping beam 16.According to design bearing requirements, adaptation to the ground, basis 12 One section 1201 from left to right, two-stage nitration 1202, three sections 1203, four sections 1204, five sections 1205, six sections 1206, Qi Zhongyi can be divided into Section 1201, three section 1203 and five section 1205 is horizontal segment, and two-stage nitration 1202 is downward with the gradient 18 of 15:100, and four section 1204 with 15: Upwards, six section 1206 with the gradient of 15:100 upwards for the gradient of 100.Corresponding, the wallboard 5 based on above-mentioned six sections is divided into Six sections from left to right, the expansion joint 17 having width to be 30mm between adjacent two ends, expansion joint 17 is outer along wall, the very useful Colophonium of wall Flax silk (not shown) is clogged, and the filling degree of depth is not less than 200mm.

2, the certainty of measurement mark that State Bureau of Technical Supervision, the Ministry of Construction combine " Code for engineering surveying " defined of issue is performed Accurate, it then follows overall to control local, high-grade control low-grade plane control principle, carry out positioning, unwrapping wire；Certainty of measurement standard Execution State Bureau of Technical Supervision, the Ministry of Construction combine the standard of " Code for engineering surveying " defined of issue；Initial data is using Front through verification, various source of data should be clear；

Position, unwrapping wire comprises following content:

Control point is set up and measuring method

Plane control

Release each major axis point with TCR802 total powerstation, then carry out angle measurement with J2 theodolite, check and correct；Use J2 theodolite In conjunction with 50,100m steel ruler carry out checking and correct, until meeting construction precision needs, the Controling network axle nomographic chart that compilation is detailed.

Set up control point 13 as required.

Measure the control of main shaft

The survey of main shaft sets employing method of polar coordinates, then uses tape to measure minor axis.Bed course passes through theodolite handle after pouring Axis is thrown on bed course.

Measuring unwrapping wire according to design drawing, the data determined by drawing release foundation ditch sideline on the spot, survey in construction Amount must also tracing and monitoring, in order to and find and correct the deviation being likely to occur in construction and excavation, prevent later rework.Each layer digs Complete all tackle cross dimensions and absolute altitude carries out a repetition measurement.

Test lineman to make: after surveying setting-out, line should be tested by surveyor and full-time Quality Inspector, test the qualified rear notice of line and measure prison The on-the-spot repetition measurement of reason, to ensure precision, to prevent mistake.

The protection at control point: control point 13 surrounding formwork-support steel pipe is gone along with sb. to guard him, goes along with sb. to guard him a size of 1m, high 1.2m, often Individual direction vertical rod 3, horizon bar 3.

3, construction prestressed cable (seeing again shown in Fig. 4-Fig. 8, Fig. 9-Figure 12)

Construction prestressed cable Specific construction flow process is, by location, preparation of construction, anchor hole bore make, anchor cable system peace, anchor hole slip casting, Construction of frame beam, tensioning fixation, examination sealing off and covering anchorage order is carried out.Its main construction link has two: one to be that anchor hole brill is made, and anchor hole bores The key problem in technology made is how to prevent hole wall collapse, bit freezing；Two is anchor hole slip casting, and how the key problem in technology of anchor hole slip casting is by anchor Outside air, rock (native) sediment and body of groundwater tap at the bottom of hole, hole, it is ensured that slip casting is full closely knit.

Anchor hole 14 aperture is Φ 200mm, and anchorage cable materials uses the high strength low relaxed prestress steel strand of Φ 15.2, and steel twists Line strength Rb=1860MPa；And using the anchorage series supporting with it, perfusion M30 cement (sand) slurry in anchor hole, cement uses PO32.5 level Portland cement.

Anchor hole bores and makes

Use the boring of MGL-150 anchoring drilling machine, air DTH drilling, air deslagging.The gradient according to hillside determines anchor hole Gradient, in this case, the gradient 1401 of anchor hole 14 is 15 °.

Rig is in place: MGL-150 anchoring drilling machine is crawler type traveling machine, according to position, domatic measuring hole, accurate installing drill Machine, carries out seat in the plane adjustment, it is ensured that anchor hole error in length and breadth in place of spudding in meets code requirement.

Drilling process: in drilling process to the formation variation of each anchor hole 14, creep into state (the pressure of the drill, drilling speed), subsoil water Construction note is performed etc. situation.Time as loose in the body stratum that caves in, broken, the drilling technology that sleeve pipe should be used to follow up, make anchor hole 14 completely do not collapse；In case of collapse hole shrinkage cavity etc. is bad creep into phenomenon time, stop immediately to bore, carry out grouting for braced wall process (grouting pressure in time Power 0.1～0.2Mpa), after cement mortar initial set, cleaning bottom of hole creeps into again.

Position, hole hole depth: position, anchor hole hole, hole depth, gradient meet design requirement.Hole position error is not preferably greater than 20mm, and aperture allows Deviation 0～10mm.For guaranteeing the degree of depth of anchor hole 14, anchor hole hole depth should exceed anchor pole 7 design length not less than 0.5m, the brill of anchor cable Hole deviation degree not should be greater than 2%.

Anchor hole is cleared up: creep into after reaching projected depth, it is impossible to stop immediately to bore, it is desirable to steady brill 1～2 minute, prevents anchor hole hole Vertex (vertices) goes out, does not reaches design aperture.After boring completes, use pressure-air (blast 0.2～0.4MPa) by rock in anchor hole 14 Powder and water body are all removed outside portalling, in order to avoid reducing the adhesion strength of cement mortar and hole wall Rock And Soil.Except relative rigid is complete Rock mass outside, high pressure water washing must not be used.Have artesian water to flow out if meeting in anchor hole 14, after hydraulic pressure, the water yield diminish can under Peace anchor cable and slip casting, suitable position arranges osculum process the most around.If design requirement processes anchor hole 14 inner product Polywater body, uses grout sealing secondary drilling method to process.

Anchor hole is checked: anchor hole 14 bores to make and terminates and through on-site supervision engineer after the assay was approved, can carry out next procedure. Verify under conditions of using the other station of design aperture, drill bit and standard drill pipe management at the scene in aperture, hole depth inspection, it is desirable to anchor hole is examined During testing, drill bit smooth-going advances, and does not produce impact or shake, and drilling tool is tested and sent length to meet design hole depth, moves back brill and requires suitable Freely, test with high pressure wind do not exist obvious splashing dirt quarrel and water body phenomenon.Require check position, anchor hole hole, inclination angle and orientation simultaneously, After all anchor hole construction subitem work is qualified, can think that inspection made by anchor hole brill qualified.

The i.e. anchor pole of anchor cable system peace makes and installs

In this case, anchor pole 7 body of rod uses steel strand wires, and steel strand wires are sometimes referred to as anchor cable.Anchor pole 7 body of rod should first remove before assembling Oil, processing of rust removing；Anchor pole 7 body free segment carries out preservative treatment by following requirement for anticorrosion: brush bituminous ship bottom paint and pitch fibers cloth Swathe three layers, be then charged in sleeve pipe；The free segment sleeve pipe two ends interior preservative of 200mm length range (this case is selected butter, Not shown in figure) filling, outer grafting engineering immobilization with adhesive tape.The composite anchor-rod that diagram is assembled into by 2 unit bolts 707,708 In 7, the free segment 701 of unit bolt 707, unit bolt 707 free segment 702 on all brush bituminous ship bottom paint and pitch fibers cloth Swathing three layers, during then correspondence loads sleeve pipe 705,706 respectively, in the present case, the anchor pole of this structure is referred to as A type anchor pole.Separately Outward, this case also uses the anchor pole being made up of three root unit anchor poles: c-type anchor pole, its structure sees shown in figure.A type anchor pole and c-type Anchor pole only has the quantitative difference of unit bolt forming anchor pole.Therefore be only discussed in detail as a example by A type anchor pole in this example.

Flat arrangement answered by steel strand wires, i.e. the axis of steel strand wires is parallel.Divide along body of rod axis direction at interval of 1.0m-1.5m Lock ring ring is not set and isolating frame 709 1 (is respectively provided with lock ring ring and isolation along body of rod axis direction at interval of 1m in this case One, frame), make steel strand anchoring section 703,704 in nodular to increase the adhesion of anchor cable and cement mortar.Anchor cable overcoat sets Bit slice 710, makes the steel strand wires can be placed in the middle in anchor hole 14, it is ensured that the mortar cover of anchor rod body is not less than 25mm, make anchor cable and Mortar forms an entirety with hole wall.In diagram, two spacers 710 are respectively welded on steel strand wires, and during use, two fixed Angle between bit slice 710 is that 2 × 45° angle is downward and symmetrical about the perpendicular comprising anchor pole 7 axis.Anchor cable head is burn-on fixed Steel anchor head guide cone (not shown) processed.

After being combined into anchor pole, the right-hand member of the sleeve pipe that each unit free section is sheathed is concordant, and left end seals.The right-hand member of anchor pole Sheathed transition conduit 711, inserts butter in transition conduit 711.The left end of transition conduit 711 uses seal plug 712 by sleeve pipe and transition Pipe 711.The right-hand member of transition conduit 711 matches with bearing plate 712.

With the bearing plate 712 that is embedded in the wall of hillside for supporting, use anchor head 713, middle pad with anchor head pedestal 714 by anchor Rope is connected on bearing plate 712.

Obviously, the bearing plate 712 being embedded in the wall of hillside is vertically arranged, owing to the gradient of anchor hole 14 is 15 °, therefore bearing plate 712 is 75 ° with the angle of anchor pole, and the oblique angle of the oblique section of anchor head pedestal 714 left end should be 15 °, the bevel of transition conduit 711 right-hand member The oblique angle in face also should be 15 °, anchor head pedestal 714 be correspondingly arranged with transition conduit 711, pressure-bearing surface 716 can be made to hang down with anchor hole axis Directly, i.e. the right-hand member of transition conduit 711 matches with bearing plate 712.

At the exposed junction of each unit anchor pole, should carry out labelling, before anchor pole stretch-draw, this labelling must not damage.

The supporting body being made up of bearing plate 712, anchor head 713, anchor head pedestal 714 should be firm with steel strand wires fixing, and must not Damage anticorrosion oils and fats and outsourcing plastics (PVC) the flexible pipe (not shown) of steel strand wires.Anchor head 713, anchor head pedestal 714 and use In intermediate plate (not shown) composition anchorage anchor cable being locked on anchor head 713.

When laying the body of rod, should prevent from turning round pressure and bending, Grouting Pipe should together put into anchor hole 14 with the body of rod；During the security protection body of rod Anticorrosive coat must not be damaged, normal slip casting operation must not be affected.

Anchor hole slip casting

Anchor pole uses M30 cement mortar 1402 to irrigate, and sand preferably uses medium sand, and cement uses the Portland cement of PO32.5； Match ratio passes through experimental configuration, can participate in appropriate early strength agent, with the shortening stretching waiting time；Mortar specimen intensity should be done before perfusion Test, paste materials 28d unconfined compressive strength is not less than 30MPa.

Putting into anchor cable Shu Houying and irrigate M30 cement mortar in time, slip casting uses hole-bottom slurry-injection method, midway must not stop slurry, note Slurry pressure is preferably 0.6～0.8MPa, and mortar injection should be full closely knit, when aperture has serosity to emerge, stops slip casting.Note for the first time Starching complete, after cement mortar solidification shrinkage, aperture should carry out mending slurry.Injection slurry should stir, with stir with, and before initial set It is finished.

After slip casting terminates, Grouting Pipe, grouting gun and slip casting sleeve pipe are cleaned up, in work progress, carry out slip casting record.

Tensioning fixation

The bearing plate 712 being embedded in barricade should be installed smooth, firm, and pressure-bearing surface 716 should be vertical with anchor hole 14 axis.

Anchor pole stretch-draw should be carried out after anchoring body reaches the 80% of design strength, and anchor pole tension sequence should avoid close anchor pole Influence each other.

Before the formal stretch-draw of anchor pole, by 0.1-0.2 times of axial tension standard value Nak to steel strand wires stretch-draw 1-2 time one by one, make steel Twisted wire is straight by root, and each location contacts is tight, then carries out the overall first stretch-draw of whole bundle.Integral tension can be by grading more than twice OK, first final tension tonnage is the 50%-70% of Soil Anchor Design anchoring load；When in anchor hole, mortar strength reaches design strength Time, carrying out last stretch-draw, anchor pole is stretched to during 1.10Nak keep 10min, and then off-load locks to 1.0Nak.

After each last stretch-draw completes, being locked on anchor head 713 by anchor cable with intermediate plate immediately, last stretch-draw completes also After locking, anchor cable exposing steel strand wires and reserves 5cm length, remaining uses hand-held abrasive wheel cutting machine to cut, and forbids electricity to cut, oxyacetylene metal-cutting, And seal anchor head according to anchor pole anchor head drawing.The anchorage of anchor head should eliminate rust, be coated with corrosion resistant coating three degree；Sealing off and covering anchorage concrete and component coagulation Soil is the most bonding, and sealing off and covering anchorage end and each connecting portion should be able to bear the hydrostatic pressure of kPa.

Check and accept sealing off and covering anchorage

Basic experiment: must carry out basic experiment according to code requirement before anchor bolt construction, every kind of test anchor pole quantity the most should not be lacked In 3.

Proof test: the quantity of proof test anchor pole takes the 5% of each type anchor pole sum, and all must not be less than 5, Big finder charge takes 1.5 times of anchor pole axial tension standard value Nak.

During sealing off and covering anchorage, the revealed section of anchorage and anchor pole is sealed in protection steel cage 715 by the protection steel cage 715 that is connected on the wall of hillside In, protection steel cage 715 uses the C35 concreting thickness protection shell 717 not less than 100mm.For ensureing protection steel cage 715 Having enough intensity, in this case, the wall thickness of protection steel cage 715 is 10mm.

The structure of stage clip 718 and set-up mode be prior art this do not repeat.

4, hillside wall construction

Construction method

Hillside wall construction uses " contrary sequence method " construction, segmentation excavation by troughs, construction from top to bottom.

After the domatic anchor cable of every one-level has been in the milk, i.e. carrying out the construction line-putting, positioning rib post 6 position, colligation makes wallboard Reinforcing bar and rib post reinforcing bar, spilled water hole 15 installs, model sheetinstallat, concreting.

Full closely knit for ensureing the concrete of the construction joint contact surface between every layer of hillside wall and last layer hillside wall, Ying Construction joint arranges bracket (not shown), and bracket end face should be 50cm with the discrepancy in elevation of construction joint, should be by after barricade form removal Bracket cuts in time, and with mortar by floating for roughened surface process.

Rib post 6, when the pre-buried transition conduit in anchor hole 14 position is conflicted with reinforcing bar, adjusts bar spacing and ensures anchor cable preformed hole position Accurate.

Formwork supporting plate, is also called form work engineering.

Formwork erection all uses plank sheathing, and template all uses 12mm nine clamping plate, and 50 × 100 flitches install.Whole mould Plate support system uses φ 48*3.5 steel pipe, fastener to connect.

Operator are when form erecting operation, it is necessary to first select template and check, reject the mould not being inconsistent prescription Plate, template use front surface all should brushing releasing agent.

Model sheetinstallat

This engineering uses plank sheathing, back of the body side and support all to use the steel pipe scaffolding of Φ 48 × 3.5, and steel pipe scaffolding is supported on foundation ditch limit Time on slope, with soil contact position chock block, it is ensured that template has enough rigidity, intensity and stability.Install spacing compliant Requirement, reaches mould indeformable during concrete placings, the most swollen.

Form work engineering points for attention

Should clean out before model sheetinstallat, reconditioning is tied, full coat interleaving agent, model sheetinstallat must have enough intensity, rigidity and Stability, seam should be tight, and mortar leakage prevention causes the concrete appearance defects such as honeycomb, pitted skin or hole.

Before model sheetinstallat, design drawing and structure drawing, unwrapping wire figure and relevant absolute altitude should be familiar with.

Should check during model sheetinstallat more, note perpendicularity, centrage, absolute altitude and the size at each position, it is ensured that structure With the shape of component each several part, size and mutual correct, and there is enough stability, rigidity and bearing capacity, seam Should not spillage, must not have foreign material in template.

With surrounding structures neighbor distance less than 500 and cannot at formwork, with surrounding structures close vicinity malthoid every Open.

Model sheetinstallat should be with reinforcing bar binding, and installation of embedded parts close fit creates conditions mutually, should first corresponding in template Labelling is made in position line, then, is fixed by built-in fitting in template.

Go through each placement members after model sheetinstallat is good the most firm, during pouring concrete, want running check, as sent out The phenomenon such as now deforming, loosen, will repair reinforcing in time, the scope that the deviation compliant of model sheetinstallat specifies, such as following table.

The tolerance (mm) of cast-in-place structural model sheetinstallat

It is noted that the situation after observing template load-bearing finds that displacement, expansion, spillage, support loosen when pouring concrete, basis sinking etc. Phenomenon should be adopted an effective measure in time and be processed.

During form removal, concrete surface or template should be avoided to be damaged as far as possible.Concrete strength when side form is removed should be able to meet Can guarantee that its surface and corner angle are injury-free.The circulation material pulled down to be transported in time, to clear up.

Colligation makes rib post reinforcing bar and hillside wall reinforcing bar (seeing again shown in Figure 24-Figure 27)

Colligation makes rib post reinforcing bar and the hillside i.e. colligation of wall reinforcing bar makes rib post reinforcing bar and hillside wall reinforcing steel bars of wallboards is also called Arrangement of reinforcement, this engine request is higher, and structure is complicated, and arrangement of reinforcement should meet design requirement.

For basis 12, one section 1201, two-stage nitration 1202, five sections 1205, six sections 1206 with reference to arrangement of reinforcement shown in Figure 24, three sections 1203, arrangement of reinforcement shown in four section of 1204 reference Figure 25.In diagram: side 20 within the walls, hillside, outside the wall of hillside 21.

For wallboard, with reference to arrangement of reinforcement shown in Figure 26.

For capping beam 16, with reference to arrangement of reinforcement shown in Figure 27.

Necessary two cards of the reinforcing bar semi-finished product (report of raw material material and product certificate or reinspection are reported) entering scene are neat Entirely；After a material is marched into the arena, typing number, classification to list stacking.

Ensureing reinforcing bar kind and specification, welding rod, the trade mark of solder flux, performance have to comply with design requirement and the rule about standard Fixed, conscientiously it is familiar with construction drawing, specifies design idea, construction in line with the drawings.

The array pitch of reinforcing bar binding, Steel Reinforcing Bar Material, molding have to carry out lower material list requirement and national regulation, meet construction reference Requirement.

Owing to this earthquake resistant engineering grade is two grades, concrete uses C35, and anchorage length of steel bar is: 37d, and bar splicing is: 45d, splice all uses lap joint, and in a cross section, the area of tension reinforcement lap joint accounts for the permission hundred of the gross area Point rate is not more than 50%.Distance at the end of splice and bar bending, cannot be less than 10 times of bar diameter, and joint is suitable It is arranged on stress smaller part.At bar splicing, Ying center and two ends iron wire fasten.

Shaping reinforcing bar and must not have lamellar, granular rust, the earth that colligation is bonded on reinforcing bar after shaping to be rinsed well, prevents Concrete shrinkage crack.

Cover to reinforcement must with the cushion block pad higher than design concrete strength just, it is ensured that protective layer thickness.

Strict by the test of national standard witness sampling, submit test report to.

Bar-mat reinforcement, in addition to the joining near peripheral rows reinforcing bar all fastens, mid portion cross point can interleaved Fasten, but must assure that steel bar stress does not produce position skew；The reinforcing bar of bidirectional stress, it is necessary to all fasten.

When installing reinforcing bar, reinforcing bar rank, diameter, radical and the spacing of configuration all should meet design requirement.Colligation or welding Bar-mat reinforcement and framework of steel reinforcement, must not have deformation, get loose and snap.

Checking and accepting emphasis is to control the kind of reinforcing bar, specification, quantity, firm, the lap of splice of colligation etc., and fills in reinforcing bar in time Hidden record and self-inspection record, the most attached relevant quality guarantee data is handed over and is specially examined check.After specially inspection check is qualified, above-mentioned data report is supervised Reason engineer confirms, when proceeding to next procedure construction after signature.Reinforcement installation position tolerance table is as follows:

The tolerance table (mm) of reinforcement installation position

Cast-in-situ reinforced concrete hillside wall

Wallboard, rib post, basis all use C35 concrete.

Strict implementation concrete casting makes system, through the every preparation of technology, quality and safety inspection, such as: construction Technical scheme prepares, technology is told somebody what one's real intentions are to installation, facility and labour force's preparation, the handing-over of steel bar template engineering, water power, the corresponding skill of illumination Art measure preparation etc., the most qualified after can sign and issue concrete casting order and carry out watering of concrete and smash.

Concreting

Concrete is forbidden directly to impact template during concreting.Making firm by ramming and vibrate with plug-in type dither, process of vibrating is produced Raw bleeding must be removed in time.

Before pouring vertical xoncrete structure, bottom should first fill out with 50～100 mm thick with concrete with the cement bonded sand of label Slurry seam as bed course (not shown) in case " rotten foot ".

The watering to smash strictly to be layered of concrete is carried out, and every layer thickness is less than 1.5 times of vibrating head effective length, up and down Connect raft and must not exceed the concrete presetting period, between strict control is sunk in real time, the intensive place of reinforcing bar, should avoid pouring and rest or relieve, really Protect pouring dense of concrete.

Special messenger should be set during concreting and observe the situation of change of template, support system, reinforcing bar etc., when being found to have deforming position Stop immediately during shifting pouring, carry out again after Chu Liwan.

After concrete placings, water seasoning.

Test block is stayed and is set

Standard maintaining test block: test block indwelling is less than 100m³The concrete of same match ratio, sampling must not be less than once；One-time continuous Pour concrete more than 1000m³Time, the every 200m of concrete of same match ratio³Sampling must not be less than once.

Maintaining test block with same condition: this engineering stays one group of test cube in the same condition every time.

Should be layered and spilled water hole is set

Wallboard should be layered in above section above ground level and arrange spilled water hole 15, is crisscross arranged up and down, pre-buried diameter in hole 100mmPVC manages, a length of 500mm, and outer oblique 5%, spilled water hole 15 level interval is 2.0m, and vertical interval is 1.5m, spilled water hole 15 Penetrate concrete body, loaded filter disposed behind, make the diameter cobble drainage heap capsule not less than 50mm, the outlet of next row spilled water hole 15 300mm above ground level.Expose spilled water hole layout and meet drawing requirement, the phenomenon that height differs, spacing is uneven must not occur.

Being additionally provided with tank 19 in the outside of hillside wall, for prior art, this does not repeats.

The invention has the beneficial effects as follows:

Carry out this grade of hillside construction prestressed cable immediately after using massif side slope stage excavation from top to bottom, fundamentally improve The mechanical property of rock mass, efficiently controls the displacement of rock mass, promotees to stabilize it, and reaches to renovate concordant, landslide and crag, danger stone Purpose, for the follow-up physical basis that this grade of hillside wall construction offer is solid on this excavation layer carried out；Excavate one layer, construction one Layer, in order to the construction quality of grading control hillside wall.

Claims

1. a prestress anchorage cable hillside wall construction technology, is characterized in that, carry out earth's surface cut, after pumping equipment, in the following order Carry out:

Prestress anchorage cable hillside the most according to claim 1 wall construction technology, is characterized in that, location, unwrapping wire:

Prestress anchorage cable hillside the most according to claim 1 wall construction technology, is characterized in that, anchor hole bores and makes:

In drilling process to the formation variation in each hole, creep into state, groundwater condition performs construction note；In case of with caving in body When layer is loose, broken, uses the drilling technology of sleeve pipe follow-up, make boring not collapse；When creeping into phenomenon such as collapse hole shrinkage cavity, vertical I.e. stopping to bore, carry out grouting for braced wall process in time, after cement mortar initial set, cleaning bottom of hole creeps into again；

Creep into after reaching projected depth, it is impossible to stop immediately to bore, it is desirable to steady brill 1～2 minute；After boring completes, use high pressure empty Rock dust in hole and water body are all removed outside portalling by gas；In addition to the rock mass that relative rigid is complete, high pressure water washing must not be used；If Meeting in anchor hole has artesian water to flow out, and can pacify down dowel and slip casting, the most around suitable position after hydraulic pressure, the water yield diminish Arrange osculum to process；When designing requirement and processing anchor hole accumulated inside water body, grout sealing secondary drilling method is used to process；

Prestress anchorage cable hillside the most according to claim 1 wall construction technology, is characterized in that, anchor cable system is pacified, i.e. anchor pole system Make and install:

Prestress anchorage cable hillside the most according to claim 1 wall construction technology, is characterized in that, anchor hole slip casting:

Prestress anchorage cable hillside the most according to claim 1 wall construction technology, is characterized in that, anchor pole stretch-draw is locked with anchor pole Fixed, i.e. tensioning fixation:

Prestress anchorage cable hillside the most according to claim 1 wall construction technology, is characterized in that, during the construction of hillside wall, and Ying Construction joint arranges bracket, and bracket end face should be 50cm with the discrepancy in elevation of construction joint, should be dug in time by bracket after the wall form removal of hillside Remove, and with mortar by floating for roughened surface process；Rib post, when the pre-buried transition conduit in anchor cable hole position is conflicted with reinforcing bar, adjusts between reinforcing bar Away from ensureing the accurate of anchor cable preformed hole position.

Prestress anchorage cable hillside the most according to claim 1 wall construction technology, is characterized in that, colligation make rib post reinforcing bar with And during the wall reinforcing bar of hillside, the reinforcing bar of next aspect reserved, in order to reinforcement welding.

Prestress anchorage cable hillside the most according to claim 1 wall construction technology, is characterized in that, as required, selects corresponding The concrete of label, implementation concrete casting cast-in-situ reinforced concrete hillside wall；

Before pouring vertical xoncrete structure, bottom should first be filled out with thick the connecing with the cement mortar of label with concrete of 50～100 mm Seam；

After concrete placings, water seasoning.

Prestress anchorage cable hillside the most according to claim 1 wall construction technology, is characterized in that, wallboard above ground level with Upper part should be layered and arrange spilled water hole, is crisscross arranged up and down, pre-buried diameter 100mmPVC pipe in hole, a length of 500mm, outward Oblique 5%, spilled water hole level interval is 2.0m, and vertical interval is 1.5m, and spilled water hole penetrates concrete body, loaded filter disposed behind, makees diameter Cobble drainage heap capsule not less than 50mm, the outlet of next row spilled water hole 300mm above ground level；Expose spilled water hole layout to meet , must not there is the phenomenon that height differs, spacing is uneven in drawing requirement.