CN110439286A - A kind of liner is put more energy into joint steel pipe concrete column drag reduction jack-up construction method of weakening - Google Patents

A kind of liner is put more energy into joint steel pipe concrete column drag reduction jack-up construction method of weakening Download PDF

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Publication number
CN110439286A
CN110439286A CN201910782527.7A CN201910782527A CN110439286A CN 110439286 A CN110439286 A CN 110439286A CN 201910782527 A CN201910782527 A CN 201910782527A CN 110439286 A CN110439286 A CN 110439286A
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CN
China
Prior art keywords
concrete
column
steel
pipe
jacking
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CN201910782527.7A
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Chinese (zh)
Inventor
柯麟质
郭桥
杨君
曾峥
侯超
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CHONGQING JIANGONG THIRD CONSTRUCTION Co Ltd
Chongqing Construction Engineering Group Co Ltd
No 3 Construction Co Ltd of Chongqing Construction Engineering Group
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CHONGQING JIANGONG THIRD CONSTRUCTION Co Ltd
Chongqing Construction Engineering Group Co Ltd
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Priority to CN201910782527.7A priority Critical patent/CN110439286A/en
Publication of CN110439286A publication Critical patent/CN110439286A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02Conveying or working-up concrete or similar masses able to be heaped or cast
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04Devices for both conveying and distributing
    • E04G21/0418Devices for both conveying and distributing with distribution hose
    • E04G21/0427Devices for both conveying and distributing with distribution hose on a static support, e.g. crane
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04Devices for both conveying and distributing
    • E04G21/0418Devices for both conveying and distributing with distribution hose
    • E04G21/0445Devices for both conveying and distributing with distribution hose with booms

Abstract

It puts more energy into joint steel pipe concrete column drag reduction jack-up construction method of weakening the invention discloses a kind of liner, comprising the following steps: preparation of construction;Steel column axis, absolute altitude are checked;Steel column aperture, weld nipple and erection center rest;Pump truck is simultaneously connect by installation flow-stop valve with delivery pipe;Pumping jacking cement mortar lubricates tube wall;Charging pumping jacking;Concrete stops jacking after overflowing;Remove jacking apparatus, cleaning steel pipe column;It inspects for acceptance.The present invention it is possible to prevente effectively from steel pipe column interior concrete leakiness, isolation the defects of, reduce process links, reduce labor intensity, accelerate construction progress.

Description

A kind of liner is put more energy into joint steel pipe concrete column drag reduction jack-up construction method of weakening
Technical field
The invention belongs to building and construction engineering technical fields, specifically, it is mixed to be related to a kind of liner joint steel pipe of putting more energy into Solidifying jack-up construction method of earth pillar drag reduction weakening.
Background technique
In recent years, with the development of material industry, various large spans, Super High, highly difficult architectural engineering are generallyd use Concrete filled steel tube, to drive the extensive use of long strands.Steel core concrete column is exactly wherein main builds One of component is built, steel core concrete column concrete lift-up technique is that filling plain concrete is filled out in thin-wall steel tube, defeated using concrete The pumping pressure of pump is sent to pour into self-compacting concrete from steel pipe column bottom, until a kind of concrete for filling whole steel pipe column is exempted from It vibrates construction method.Currently, the domestic general height of steel pipe column interior concrete jack-up construction is at 30 meters hereinafter, a small number of height are 30 Meter or more superelevation steel pipe column interior concrete jack-up construction mostly use section jacking method, the success rate disposably jacked is not high;And And when jacking concrete, the weld seam between joint steel pipe column and feed pipe is torn that jacking is caused to fail sometimes, because This improves concrete filled steel tubular column concrete lift-up construction technique, further to push concrete filled steel tubular column concrete lift-up to apply The problems in the application range of work technique and solution work progress are extremely urgent.
Summary of the invention
In view of this, the present invention is directed to above-mentioned problem, provides a kind of liner and put more energy into joint steel pipe concrete column drag reduction Jack-up construction method of weakening.
In order to solve the above-mentioned technical problem, it puts more energy into joint steel pipe concrete column drag reduction weakening the invention discloses a kind of liner Jack-up construction method, comprising the following steps:
Step 1, preparation of construction;
Step 2, steel column axis, absolute altitude are checked;
Step 3, steel column aperture, weld nipple and erection center rest;
Pump truck is simultaneously connect by step 4, installation flow-stop valve with delivery pipe;
Step 5, pumping jacking cement mortar lubricate tube wall;
Step 6, charging pumping jacking;
Step 7, concrete stop jacking after overflowing;
Step 8 removes jacking apparatus, cleaning steel pipe column;
Step 9 is inspected for acceptance.
Optionally, the preparation of construction in the step 1 specifically:
Step 1.1, equipment prepare: towed pump is set in choosing, is debugged before construction;
Step 1.2 works to the pre-control of concrete, checks the slump of concrete, controls in 210 ± 10mm;
Step 1.3 collects weather forecast information, and pouring the time cannot be rainy weather, guarantees concrete forming quality.
Optionally, the steel column axis in the step 2, absolute altitude are checked specifically:
Step 2.1 drafts measurement coordinate system according to established, calculates the reason of steel column center and control point under the coordinate By coordinate, steel column is corrected with polar coordinates principle;
Step 2.2 beats absolute altitude control line on the steel column corrected, carries out inlet aperture positioning, makes the position of aperture It sets in up 80 centimeters of elevation of floor level.
Optionally, the steel column aperture in the step 3, weld nipple and erection center rest specifically:
The lower end of the connection of step 3.1, steel pipe column and concrete pump pipe, feed pipe passes sequentially through flow-stop valve and concrete pump Conveying high-pressure sebific duct is connect with pump line;Feed pipe and steel pipe column are in 45 °, and the exit face for the tube head that discharges is in a horizontal state, to reduce Concrete is directly injected to column wall after entering steel pipe column, increases the upward top lift of concrete;
Step 3.2 is uniformly welded with 6 stiffener plates around feed pipe, prevents from shaking acutely at feed inlet when construction, By the weld seam tear between feed pipe and steel pipe column, stiffened panel and weld seam are according to " Steel Structural Design standard " progress strength checking;
Step 3.3, concrete pump conveying high-pressure sebific duct upper end are equipped with flow-stop valve, install concrete between feed pipe and pump line additional Pump conveying high-pressure sebific duct;
Below step 3.4, pump line be arranged center rest structure, reduce whole device because charging caused by vibration, Center rest carries out intensity and Stability Checking according to " Steel Structural Design standard ".
Optionally, the installation flow-stop valve in step 4 and pump truck is connect with delivery pipe specifically:
Step 4.1, installation flow-stop valve: being arranged a flow-stop valve on pump line, and flow-stop valve forward flange and concrete pump convey High-pressure rubber pipe connection, flow-stop valve rear flange are connect with feed pipe;
Step 4.2, pump truck and delivery pipe connect: when connecing reducer pipe from the discharge port of concrete pump, selecting ratio Longer reducer pipe, the pipe of serious wear cloth as far as possible should be excluded from concrete pump remote position when plugging occurs in time.
Optionally, the pumping jacking cement mortar in the step 5 lubricates tube wall specifically: cement mortar is leading in front Jacking, subsequent concrete is immediately after.
Optionally, the charging in the step 6 pumps jacking specifically:
Step 6.1, concrete slump detection: slump cylinder is put in the stiffener plate not absorbed water, funnel is placed on slump On cylinder, foot pedal, mix divides in three layers of loading cylinder;Lift slump cylinder immediately immediately, slump cylinder is placed on cone concrete On one side, cylinder top lays flat the ruler towards mix to sample, with steel ruler measure ruler bottom surface to sample highest point it is vertical away from From;Ensure the slump in 210 ± 10mm;
Step 6.2 adds water-reducing agent and swelling agent simultaneously in plastic concrete;
Step 6.3, production concrete test block: two layers of loading die trial of concrete mix point, tamper are smash several times more, are then answered Die trial surrounding is touched with rubber hammer, last smooth out surface, mark is feeding and same feeding while carrying out;
Step 6.4, the sealing plate of steel pipe top are preceding without installation on concrete liquid level liter top, finish to a liter top and pacify again later Dress;
Concrete vehicle must be all on board or cannot have interruption when step 6.5, jacking concrete, and pump truck was suppressed It cannot be interrupted in journey, it is necessary to which continuous jacking concrete to top side can stop.
Optionally, stop jacking after the concrete in the step 7 overflows specifically: stop in time after concrete overflows Pump truck, flow-stop valve are closed, and after concrete pumping jacking pours, control pump pressure 2-3min, then the bolt of slightly loose flashboard, is beaten Enter fluid stopping valve plate.
Optionally, the dismounting jacking apparatus in the step 8, cleaning steel pipe column specifically:
After step 8.1, fluid stopping valve plate are closed, i.e. dismantling concrete delivery pipe moves on to lower limb pipe, and steel pipe column is remained Concrete washing it is clean, after core concrete intensity up to after 70%, remove flow-stop valve;
Step 8.2, excision connection short tube, repair welding hole tube wall polish, touch-up paint, and after concrete curing 28 days, welding is bound Plate.
Optionally, inspecting for acceptance in the step 9 specifically: stress wave pulse-echo method is carried out to steel column and is gone directly The detection of wave method carries out reinforcement using bored grouting method to uncompacted position, then will drilling repair welding closing.
Compared with prior art, the present invention can be obtained including following technical effect:
1) present invention can reduce process ring disposably by the concrete lift-up in steel core concrete column to desired height Section reduces labor intensity, accelerates construction progress, compared with high dropping without vibration method, can effectively avoid steel pipe column interior concrete The defects of leakiness, isolation, it is ensured that concrete quality meets design requirement.
2) present invention uses jacking construction process, and pollution of the cement slurry to steel construction in concrete casting can be reduced or avoided, Be conducive to finished product protection.
3) steel pipe column of the present invention is effectively connected by liner connecting pipe of putting more energy into, in addition jacking apparatus and flow-stop valve, Biggish jacking resistance can be overcome, the primary jacking for completing whole concrete in superelevation reducing steel tube column.
4) present invention has lubricated the inner surface of steel pipe column by using the method that first jacking cement mortar is cleared the way in front, The frictional resistance for largely reducing concrete Yu steel pipe column inner surface enables to follow closely in the subsequent concrete of cement mortar Enough swimmingly to be jacked, therefore, this method can be realized the primary jacking of superelevation reducing steel tube column inner concrete, construction efficiency Height, construction quality are easily guaranteed that.
5) construction method of the present invention is realized by jacking apparatus, by using the knot that center rest is arranged below pump line Structure reduces whole device because of vibration caused by feeding.By using the welding stiffener plate between feed pipe and steel pipe column Structure, the connection between Lai Jiaqiang feed pipe and steel pipe column can be avoided the weld seam tear between feed pipe and steel pipe column, guarantee Construction safety can be mixed by installing concrete pump conveying high-pressure sebific duct additional between feed pipe and pump line into steel pipe column Solidifying soil is buffered, and vibration damping is played the role of.Realize disposably successfully jacking for steel pipe column interior concrete.
Certainly, it implements any of the products of the present invention it is not absolutely required to while reaching all the above technical effect.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is that steel pipe column liner of the present invention is put more energy into connection schematic diagram;
Fig. 2 is that liner of the present invention is put more energy into the process flow of a joint steel pipe concrete column drag reduction jack-up construction method of weakening Figure;
Fig. 3 is the connection figure of steel pipe column and concrete delivery pipe of the present invention.
Specific embodiment
Carry out the embodiment that the present invention will be described in detail below in conjunction with embodiment, whereby to the present invention how application technology hand Section solves technical problem and reaches the realization process of technical effect to fully understand and implement.
It puts more energy into joint steel pipe concrete column drag reduction jack-up construction method of weakening the invention discloses a kind of liner, work Skill principle is as follows: steel pipe column is segmental hoisting, and is effectively connected by liner connecting pipe of putting more energy into, and after the completion of lifting, is indulged Steel pipe column interior concrete can be carried out after being installed in place to horizontal vertical support to pour.One is opened on the lower part tube wall of steel pipe column The outlet of concrete pump is connected with inlet with high-pressure delivery pump line, is being jacked by the inlet of 3mm more bigger than delivery pipe Increase pumping cement mortar step before concrete, to open lubrication steel pipe inner wall, largely reduces concrete and steel pipe column And the effect of the frictional resistance of ring flange.Concrete is injected continuously into steel pipe column by being pumped by delivery pipe after above-mentioned steps, By lifting principle, concrete is by lower end in steel pipe column until upper end fills concrete in managing.Overflow gas vent is set at the top of steel pipe column, To reduce pumping pressure.In steel pipe column lower interface connecting tube, using the method for setting flow-stop valve, prevent concrete from flowing backwards. After the concrete lift-up of steel pipe column, quality determining method is lossless using concrete filled steel tube hammering method, ultrasonic Detection Method etc. Detection method.
The following steps are included:
Step 1, preparation of construction:
Step 1.1, equipment prepare: drag pump is set in choosing, is debugged before construction.Pump truck has automotive pump and towed currently on the market Pump two types: 1. towed pump pumping pressure is high, and pumping elevation can achieve 180m (related with delivery pipe caliber), but towed Pump installing and dismounting conveyance conduit is more troublesome, and flexibility is not strong enough, constructs slower;Its advantage mainly has: occupied area compared with Small, to live cross-operation there are certain space, One-Shift Costs are smaller;Concrete pumping discharge capacity is small, and flow velocity is smaller, damages to resistance Mistake is smaller, has larger assurance to once pouring successfully.2. automotive pump pumping pressure is pumped lower than towed, but flexibility is stronger, no With installing and removing delivery pipe, feed pipe only need to be installed, but One-Shift Costs are higher, occupied area is larger, and pillar can be continuous Construction, but the sealing performance of delivery pipe is required strictly, to be unable to spillage, otherwise will appear and generate isolation because of spillage;Concrete Pump displacement is big, and flow velocity is very fast, larger to drag losses, and disposably pouring successfully needs actual verification, final true through comprehensively considering Determine the Lifting Equipment that towed pump is this jack-block.
Step 1.2 works to the pre-control of concrete, checks the slump of concrete, controls in 210 ± 10mm.For this Secondary concrete filled steel tube has done claimed below: 1. preferable workability;2. the presetting period is appropriately extended, meets pumping procedure and taken Between (it according to measuring and calculating, stirs from concrete to pumping to finish and needs 4h, and be added to after retarder, the presetting period extends to 8h, Fully meet actual requirement);3. Concrete Mixing Station ingredient must satisfy the design requirement of match ratio;4. being added appropriate swollen Swollen dose, prevent concrete setting from shrinking and generating the gap between concrete and steel pipe walls;5. self compacting ability.
Step 1.3 collects weather forecast information, adjusts the time that pours of concrete, guarantees concrete forming quality, pours Time is the weather that do not rain.
Step 2, steel column axis, absolute altitude are checked:
Step 2.1 drafts measurement coordinate system according to established, calculates the reason of steel column center and control point under the coordinate By coordinate, steel column is corrected with polar coordinates principle.
Step 2.2 beats absolute altitude control line on the steel column corrected, carries out inlet aperture positioning, makes the position of aperture It sets in up 80 centimeters of elevation of floor level.
Step 3, steel column aperture, weld nipple and erection center rest:
The lower end of the connection of step 3.1, steel pipe column and concrete pump pipe, feed pipe passes sequentially through flow-stop valve and concrete pump Conveying high-pressure sebific duct is connect with pump line.Feed pipe and steel pipe column are in 45 °, and the exit face for the tube head that discharges is in a horizontal state, to reduce Concrete is directly injected to column wall after entering steel pipe column, increases the upward top lift of concrete;
Step 3.2 is uniformly welded with 6 stiffener plates around feed pipe, prevents from shaking acutely at feed inlet when construction, By the weld seam tear between feed pipe and steel pipe column, stiffened panel and weld seam should carry out intensity according to " Steel Structural Design standard " and test It calculates;
Step 3.3, concrete pump conveying high-pressure sebific duct upper end are equipped with flow-stop valve, install concrete between feed pipe and pump line additional Conveying high-pressure sebific duct is pumped, the concrete for entering steel pipe column can be buffered, play the role of vibration damping.
Below step 3.4, pump line be arranged center rest structure, reduce whole device because charging caused by vibration, Center rest carries out intensity and Stability Checking according to " Steel Structural Design standard ", guarantees that its is solid and reliable.Steel pipe column and coagulation Fig. 3 is shown in the connection of native delivery pipe.
Pump truck is simultaneously connect by step 4, installation flow-stop valve with delivery pipe:
Step 4.1, installation flow-stop valve: to prevent the concrete when removing delivery pipe from flowing back, one need to be arranged on pump line Fluid stopping device, this method use flow-stop valve, and flow-stop valve forward flange is connect with concrete pump conveying high-pressure sebific duct, flow-stop valve rear flange It is connect with feed pipe.
Step 4.2, pump truck and delivery pipe connect:
When connecing reducer pipe from the discharge port of concrete pump, two sections of reducer pipes are selected, plugging can be both greatly reduced Frequency, reduce to the greatest extent using bend pipe, the pipe of serious wear should cloth as far as possible from concrete pump remote position, in order to avoid pressure Excessively high booster should exclude in time when plugging occurs.
Step 5, pumping jacking cement mortar lubricate tube wall:
Cement mortar jacks in advance in front, and subsequent concrete is immediately after.The effect of pumping jacking cement mortar is all It is largely to reduce concrete and steel pipe column to lubricate steel pipe inner wall and liner is put more energy into the frictional resistance of connecting pipe.
Step 6, charging pumping jacking:
Step 6.1, concrete slump detection: slump cylinder is put in the stiffener plate not absorbed water, funnel is placed on slump On cylinder, foot pedal, mix divides in three layers of loading cylinder.Lift slump cylinder immediately immediately, slump cylinder is placed on cone concrete On one side, cylinder top lays flat the ruler towards mix to sample, with steel ruler measure ruler bottom surface to sample highest point it is vertical away from From.Ensure the slump in 210 ± 10mm.
Step 6.2 adds water-reducing agent and swelling agent simultaneously in plastic concrete, subtracts concrete batching system bleeding rate Small, air content increases, and workability improves, to meet pumping requirements.
Step 6.3, production concrete test block: two layers of loading die trial of concrete mix point, tamper are smash several times more, are then answered Die trial surrounding is touched with rubber hammer, last smooth out surface, mark is feeding and same feeding while carrying out.
When step 6.4, traditional jack-block steel core concrete column pour, gas vent is set in steel pipe top, main function is The gas in steel pipe is excluded in concreting process.If the concrete liquid level rate of climb is too fast, gas vent cannot be timely The gas for excluding steel duct, just will increase resistance of the concrete in pumping procedure.This engineering concrete filled steel tube column diameter compared with Greatly, the concrete liquid level rate of climb is more slow, so exhaust is more unobstructed.In view of still needing to the factor of exhaust, steel pipe top Sealing plate concrete liquid level rise top before without installation, to liter top finish after install again, avoid gas vent that from cannot arranging in time Except steel inner air tube, keep steel duct atmospheric pressure excessive, forms resistance.
Concrete vehicle must be all on board or cannot have interruption when step 6.5, jacking concrete, and pump truck was suppressed It must not be interrupted in journey, it is necessary to which continuous jacking concrete to top can stop.
Step 7, concrete stop jacking after overflowing:
Stopping pump truck in time after concrete overflows, flow-stop valve is closed, after concrete pumping jacking pours, control pump 2-3min is pressed, then the bolt of slightly loose flashboard, squeezes into fluid stopping valve plate.
Step 8 removes jacking apparatus, cleaning steel pipe column:
Step 8.1, fluid stopping valve plate close after, can dismantling concrete delivery pipe, move on to lower limb pipe, and steel pipe column is residual The concrete washing stayed is clean, after core concrete intensity up to after 70%, removes flow-stop valve.
Step 8.2, excision connection short tube, repair welding hole tube wall polish, touch-up paint, and after concrete curing 28 days, welding is bound Plate.
Step 10 is inspected for acceptance:
Stress wave pulse-echo method and the detection of direct wave method are carried out to steel column, it, should be using drilling to uncompacted position Slip casting method carries out reinforcement, then will drilling repair welding closing.
This construction method is suitable for self-compacting concrete strength grade C50 or less, top lifting height 65m or less, diameter of phi 800 The primary pumping of following steel pipe column jacks.
Embodiment 1:
Steel pipe is good compression member, tube wall or reasonable resistance to side pressure template, construct concrete when can save branch Mould, demoulding artificial and material.Steel pipe is good framework of steel reinforcement and stiffness load-bearing skeleton, can simplify in construction construction technology, Scaffold is saved, shortens the construction period, reduce construction land tenure.Concrete construction is closely knit by jacking extruding nature without vibrating.It is convenient Construction, scene civilization, speed is fast, short time limit, and the pouring quality of concrete can be effectively ensured, and ensure the quality of major project And progress, and embody in the construction process technologically advanced, economical rationality, effectively shorten the duration, using environmental requirement, guarantee Quality, safety.
One, concrete filled steel tube is keeping self-respect close and bearing capacity under the same conditions compared with steel construction, can save steel About 30%;Compared with ordinary reinforced concrete, keeping rolled steel dosage close or the identical condition of bearing capacity, element cross-section Product can reduce half, so that space is increased, the concrete amount and member dead weight of corresponding reduction about 50%.
Two, steel core concrete column concrete pumping jack-up construction complex art simplifies construction technology, saves labour cost, subtracts The investment of circulation material is lacked, has saved material, reduce construction land tenure, can ensure that construction quality, while shortening the construction period. It is calculated by 92 steel pipe columns in total, every column 66 × 3.14 × (0.45/2)2=10.49 cubes of concrete meters;Using tradition by Section pours the method for smashing and using jack-up construction method, and cost analysis is as follows:
A. tradition is poured smash method expense paragraph by paragraph:
30 yuan/m of concrete vibrating expense3, meter: 92 × 10 × 30=27600 member.
Every column all needs out at least four to vibrate hole, aperture and blocks 50 yuan/of expense meter: 92 × 4 × 50=18400 member.
It sets up scaffold and needs steel pipe 134960t, fastener 30960, need 22561.6 yuan of lease expenses.
B. jack-up construction method expense:
The expense of jack-block construction increase valve, each 80 yuan of shut-off valve, each 25 yuan of check valve, totally 164, check valve, Shut-off valve 2, valve expense are as follows: 92 × 25+2 × 80=2460 member.
Jack-block construction uses self-compacting concrete, adds every cube of Cost of Concrete of additive and slag powders and increases by 15 Member: 92 × 10 × 15=13800 member.
60 yuan/of expense meter of aperture, welding check valve and solder up steel plate etc.: 92 × 60=5520 member.
C. it saves money in total are as follows:
27600+18400+22561.6-2460-13800-5520=46781.6 first.
Then save the cost (27600+18400+22561.6-2460-13800-5520)/(27600+18400+ 22561.6) * 100%=68.2%.
Three, using jack-up construction method, compared to the method for smashing is poured paragraph by paragraph, the duration shortens about 20 days.
Above description has shown and described several preferred embodiments of invention, but as previously described, it should be understood that invention is not It is confined to form disclosed herein, should not be regarded as an exclusion of other examples, and can be used for various other combinations, modification And environment, and can be carried out within that scope of the inventive concept describe herein by the above teachings or related fields of technology or knowledge Change.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of invention, then it all should be in the appended power of invention In the protection scope that benefit requires.

Claims (10)

  1. A kind of jack-up construction method of joint steel pipe concrete column drag reduction weakening 1. liner is put more energy into, which is characterized in that including with Lower step:
    Step 1, preparation of construction;
    Step 2, steel column axis, absolute altitude are checked;
    Step 3, steel column aperture, weld nipple and erection center rest;
    Pump truck is simultaneously connect by step 4, installation flow-stop valve with delivery pipe;
    Step 5, pumping jacking cement mortar lubricate tube wall;
    Step 6, charging pumping jacking;
    Step 7, concrete stop jacking after overflowing;
    Step 8 removes jacking apparatus, cleaning steel pipe column;
    Step 9 is inspected for acceptance.
  2. 2. construction method according to claim 1, which is characterized in that the preparation of construction in the step 1 specifically:
    Step 1.1, equipment prepare: towed pump is set in choosing, is debugged before construction;
    Step 1.2 works to the pre-control of concrete, checks the slump of concrete, controls in 210 ± 10mm;
    Step 1.3 collects weather forecast information, and pouring the time cannot be rainy weather, guarantees concrete forming quality.
  3. 3. construction method according to claim 1, which is characterized in that steel column axis, absolute altitude in the step 2 check tool Body are as follows:
    Step 2.1 drafts measurement coordinate system according to established, calculates the theoretical seat of steel column center and control point under the coordinate Mark, is corrected steel column with polar coordinates principle;
    Step 2.2 beats absolute altitude control line on the steel column corrected, carries out inlet aperture positioning, makes at the position of aperture In up 80 centimeters of elevation of floor level.
  4. 4. construction method according to claim 1, which is characterized in that steel column aperture, weld nipple in the step 3 and Set up center rest specifically:
    The connection of step 3.1, steel pipe column and concrete pump pipe, the lower end of feed pipe pass sequentially through flow-stop valve and concrete pump conveying High-pressure rubber pipe is connect with pump line;Feed pipe and steel pipe column are in 45 °, and the exit face for the tube head that discharges is in a horizontal state, to reduce coagulation Soil is directly injected to column wall after entering steel pipe column, increases the upward top lift of concrete;
    Step 3.2 is uniformly welded with 6 stiffener plates around feed pipe, and vibration acutely, will be at feed inlet when preventing construction Weld seam tear between expects pipe and steel pipe column, stiffened panel and weld seam carry out strength checking according to " Steel Structural Design standard ";
    Step 3.3, concrete pump conveying high-pressure sebific duct upper end are equipped with flow-stop valve, and it is defeated to install concrete pump between feed pipe and pump line additional Send high-pressure rubber pipe;
    The structure of center rest is set below step 3.4, pump line, reduces whole device because of vibration caused by feeding, stablizes Bracket carries out intensity and Stability Checking according to " Steel Structural Design standard ".
  5. 5. construction method according to claim 1, which is characterized in that installation flow-stop valve in step 4 and by pump truck with it is defeated Pipe is sent to connect specifically:
    Step 4.1, installation flow-stop valve: a flow-stop valve, flow-stop valve forward flange and concrete pump conveying high-pressure are set on pump line Sebific duct connection, flow-stop valve rear flange are connect with feed pipe;
    Step 4.2, pump truck and delivery pipe connect: when connecing reducer pipe from the discharge port of concrete pump, selecting long Reducer pipe, the pipe of serious wear cloth as far as possible should exclude from concrete pump remote position when plugging occurs in time.
  6. 6. construction method according to claim 1, which is characterized in that the pumping jacking cement mortar profit in the step 5 Slip pipe wall specifically: cement mortar jacks in advance in front, and subsequent concrete is immediately after.
  7. 7. construction method according to claim 1, which is characterized in that the charging in the step 6 pumps jacking specifically:
    Step 6.1, concrete slump detection: slump cylinder is put in the stiffener plate not absorbed water, and funnel is placed on slump cylinder, Foot pedal, mix divide in three layers of loading cylinder;Lift slump cylinder immediately immediately, slump cylinder is placed on cone concrete sample one Side, cylinder top lay flat the ruler towards mix, with steel ruler measure ruler bottom surface to sample highest point vertical range;Ensure The slump is in 210 ± 10mm;
    Step 6.2 adds water-reducing agent and swelling agent simultaneously in plastic concrete;
    Step 6.3, production concrete test block: two layers of loading die trial of concrete mix point, tamper are smash several times more, then apply rubber Skin hammers tapping die trial surrounding into shape, and last smooth out surface, mark is feeding and same feeding while carrying out;
    Step 6.4, the sealing plate of steel pipe top are preceding without installation on concrete liquid level liter top, finish to a liter top and install again later;
    During concrete vehicle must be all on board or cannot have interruption, pump truck to suppress when step 6.5, jacking concrete It cannot interrupt, it is necessary to which continuous jacking concrete to top side can stop.
  8. 8. construction method according to claim 1, which is characterized in that the concrete in the step 7 stops top after overflowing It rises specifically: stop pump truck in time after concrete overflows, flow-stop valve is closed, after concrete pumping jacking pours, control It is pumped 2-3min, then the bolt of slightly loose flashboard, squeezes into fluid stopping valve plate.
  9. 9. construction method according to claim 1, which is characterized in that dismounting jacking apparatus, cleaning steel in the step 8 Tubing string specifically:
    After step 8.1, fluid stopping valve plate are closed, i.e. dismantling concrete delivery pipe moves on to lower limb pipe, and steel pipe column is remaining mixed Solidifying soil cleans up, and after core concrete intensity up to after 70%, removes flow-stop valve;
    Step 8.2, excision connection short tube, repair welding hole tube wall polishes, touch-up paint, after concrete curing 28 days, welds the plate that binds.
  10. 10. construction method according to claim 1, which is characterized in that inspecting for acceptance in the step 9 specifically: right Steel column carries out stress wave pulse-echo method and the detection of direct wave method, to uncompacted position, is mended using bored grouting method It by force, then will drilling repair welding closing.
CN201910782527.7A 2019-08-23 2019-08-23 A kind of liner is put more energy into joint steel pipe concrete column drag reduction jack-up construction method of weakening Pending CN110439286A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111636687A (en) * 2020-06-17 2020-09-08 中铁十四局集团建筑工程有限公司 Box steel column core-filling concrete pumping jacking mechanism and construction method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111636687A (en) * 2020-06-17 2020-09-08 中铁十四局集团建筑工程有限公司 Box steel column core-filling concrete pumping jacking mechanism and construction method

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