CN109468958A - A kind of king-tower king-post construction technology - Google Patents

A kind of king-tower king-post construction technology Download PDF

Info

Publication number
CN109468958A
CN109468958A CN201811402688.0A CN201811402688A CN109468958A CN 109468958 A CN109468958 A CN 109468958A CN 201811402688 A CN201811402688 A CN 201811402688A CN 109468958 A CN109468958 A CN 109468958A
Authority
CN
China
Prior art keywords
king
construction
post
tower
strand wires
Prior art date
Application number
CN201811402688.0A
Other languages
Chinese (zh)
Inventor
李业勋
汪涛
项勇
韩立勤
姜荣华
莫亚思
Original Assignee
中交第三航务工程局有限公司
中交第三航务工程局有限公司上海分公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中交第三航务工程局有限公司, 中交第三航务工程局有限公司上海分公司 filed Critical 中交第三航务工程局有限公司
Priority to CN201811402688.0A priority Critical patent/CN109468958A/en
Publication of CN109468958A publication Critical patent/CN109468958A/en

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/14Towers; Anchors ; Connection of cables to bridge parts; Saddle supports

Abstract

The invention discloses a kind of king-tower king-post construction technologies, comprising the following steps: king-tower king-post is divided into two construction sections from bottom to top, the construction section includes the first construction section positioned at bottom and the second construction section more than the first construction section;First construction section carries out king-post construction by setting up bracket;Second construction section carries out king-post construction by setting up stiff skeleton, the stiff skeleton constitutes the whole bar construction of the second construction section of king-post, the side of the stiff skeleton is made of several reinforcing bars interconnected, the installation space of the inside setting steel strand wires of the stiff skeleton;Hydraulic climbing formwork and formwork reinforcement: being arranged several pieces of inner and outer templates on the outside of stiff skeleton, and inner and outer template is fixed by bolts, and casting chamber is formed between the external mold and the stiff skeleton;Concrete placings: the casting concrete between inner and outer template forms thin-walled king-post.Using above-mentioned technique, it is easy for construction, positioning it is easy to operate, without installing interim steel bracket.

Description

A kind of king-tower king-post construction technology

Technical field

The invention mainly relates to king-post technical field of construction more particularly to a kind of king-tower king-post construction technologies.

Background technique

Clear China's main tower of bridge king-post uses the yeast of outside sweep 325m, inside curve radius 270m, 300m composition Line lotus flower moulding, high 100.8m, 23 construction segments of single pier point, standard knot high 4.5m, concrete grade C55, and for substantially Product concrete works, construction time cross over winter, and concrete control splits that difficulty of construction is big;King-post construction uses hydraulic climbing mould construction work Skill, and since whole king-post is arc, considerably increase climbing formwork for construction difficulty;Vertical prestressing steel strand wires are set in king-post, it is single For up to 52.54m most weighs about 6t.

King-post construction, after vertical steel strand wires need to be made generally vertical, can just construct, since original designs steel strand wires length Greatly, weight is big, so that it is kept vertical more difficult, need to set up interim steel bracket, fall within steel strand wires weight on steel bracket, then The installation of strength type skeleton and framework of steel reinforcement is carried out,

The installation of interim steel bracket not only consumable material and labour, but also belong to high altitude operation, risk is higher.

The positioning of conventional bellows uses groined type reinforcing bar, by bellows and steel strand wires weight transmitting to framework of steel reinforcement, this After kind technique will require framework of steel reinforcement to install, bellows positioning can be carried out, groined type reinforcing bar just has impetus, only for wall thickness One meter of king-post, bellows positioning operation personnel need to enter framework of steel reinforcement inside processing, and operating space is very narrow, construction efficiency It is extremely inefficient.

Summary of the invention

It is an object of the invention to overcome above-mentioned technological deficiency, provide it is a kind of it is easy for construction, positioning is easy to operate, without peace Fill the king-tower king-post construction technology of interim steel bracket.

In order to realize that said effect, the present invention are achieved using following technological means:

A kind of king-tower king-post construction technology, comprising the following steps:

King-tower king-post is divided into two construction sections from bottom to top, the construction section include positioned at bottom the first construction section with And the second construction section more than the first construction section;

First construction section carries out king-post construction by setting up bracket;

Second construction section carries out king-post construction by setting up stiff skeleton, and the stiff skeleton constitutes the of king-post The side of the whole bar construction of two construction sections, the stiff skeleton is made of several reinforcing bars interconnected, the stiffness The installation space of the inside setting steel strand wires of skeleton;

Hydraulic climbing formwork and formwork reinforcement: being arranged several pieces of inner and outer templates on the outside of stiff skeleton, and inner and outer template uses bolt It is fixed, casting chamber is formed between the external mold and the stiff skeleton;

Concrete placings: the casting concrete between inner and outer template forms thin-walled king-post.

Since king-tower king-post height of the invention is higher, if therefore it is single interim steel bracket need to be set up using the first construction section, Interim steel bracket construct more than on the middle and senior level than relatively hazardous therefore the second construction section of introducing in high altitude operation;Second construction Section is mainly constructed using stiff skeleton combination steel strand wires, and integral construction is convenient, is saved into without installing interim steel bracket This, improves safety.

It in a preferred embodiment of the invention, further include steel strand wires construction procedure, steel strand wires construction procedure position Before the hydraulic climbing formwork and formwork reinforcement, the steel strand wires section construction, individual steel strand wires apply pre- after being installed Stress is fixed, and wherein steel strand wires and steel strand wires are connected with each other using connector.

When steel strand wires are for the first construction section, a steel strand wires one end is anchored on king-post ground, the other end Next steel strand wires are connected by connector;When steel strand wires are for the second construction section, steel strand wires, which are beaten, to be ridden upon by stiffness bone On the angle steel that frame extends internally, guarantee steel strand wires in the construction process vertically upward;When the first construction section or/and the second construction section After steel strand wires are constructed, prestressing force stretching is carried out to steel strand wires by prestressing force strainer.

In a preferred embodiment of the invention, the side of the steel strand wires is also surrounded with bellows.In addition pacify After dress, U-shaped reinforcing bar navigates to bellows on the angle steel of mounted strength type skeleton, in addition to reducing bellows Disrepair phenomenon increases spiral wire gum sleeve, again by protection sleeve pipe when respective stage bellows positions outside bellows Removal.This measure effectively avoids the damaging problem of bellows.

It in a preferred embodiment of the invention, further include curing in the mold and demoulding step;

The curing in the mold is to be applied to concrete surface by healthy liquid to be conserved;The demoulding is using release agent Demoulding, that is, form king-tower king-post.

It in a preferred embodiment of the invention, further include the heat preservation to template outer surface in the concrete placings step And the cooling of concrete.By carrying out heat preservation and concrete cooling to template, the concrete formed after pouring can be reduced Component internal-external temperature difference improves the intensity of concrete component.

In a preferred embodiment of the invention, the heat preservation to template outer surface is specially to work as construction environment temperature When lower than 5 DEG C, in the fixed insulating layer of outer mould surface, while in insulation layer surface covering and heat insulating plate.I.e. when the temperature is too low, externally Mould surface carries out isothermal holding, avoids surface temperature from being lost too fast, reduces internal-external temperature difference, prevent concrete cracking.

In a preferred embodiment of the invention, the cooling of the concrete, specially when construction environment temperature is higher than At 35 DEG C, ice water mix is carried out using cooling-water machine when concrete is poured.Concrete component molding temperature is mainly reduced at this time, is made It differs less with surface low-temperature.

In a preferred embodiment of the invention, the king-tower king-post is mutually spliced by several straightway king-posts At, and constitute the arcuate structure of king-tower king-post.By adjusting the length of straight-line segment, it is on the one hand easy construction, on the other hand, Arcuate structure easy to form.

In a preferred embodiment of the invention, each straightway king-post passes through the first construction segment process or Two construction segment process pour.

In a preferred embodiment of the invention, 4.5 meters of the standard knot length of the king-post of each straightway, it is whole King-tower king-post passes through the angle change of 23 straightways, forms arcuate structure.

Beneficial effects of the present invention are as follows:

In the present invention, by adjusting form of construction work, high-altitude construction steel strand wires are more convenient, furthermore such that bellows is located in After the installation of strength type skeleton, is carried out before framework of steel reinforcement installation, more well-to-do operating space is provided for operating personnel, improve construction Efficiency.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of king-post of the invention.

Fig. 2 is the sectional view of stiff skeleton of the invention.

Fig. 3 is the settlement observation curve graph of pre-buried prism of the invention.

Specific embodiment

In order to make the present invention realize technological means, innovative characteristics, complete effect it can be readily appreciated that this hair is further described It is bright.It realizes that technological means of the invention should not be limited to following instance, can be adjusted in the range of foregoing invention content.

Embodiment 1

A kind of king-tower king-post construction technology in the present invention, comprising the following steps: king-tower king-post is divided into two from bottom to top Construction section, the construction section include the first construction section positioned at bottom and the second construction section more than the first construction section;

First construction section carries out king-post construction by setting up bracket;

Second construction section carries out king-post construction by setting up stiff skeleton, and the stiff skeleton constitutes the of king-post The side of the whole bar construction of two construction sections, the stiff skeleton is made of several reinforcing bars interconnected, the stiffness The installation space of the inside setting steel strand wires of skeleton;

Hydraulic climbing formwork and formwork reinforcement: being arranged several pieces of inner and outer templates on the outside of stiff skeleton, and inner and outer template uses bolt It is fixed, casting chamber is formed between the external mold and the stiff skeleton;

Concrete placings: the casting concrete between inner and outer template forms thin-walled king-post.

Since king-tower king-post height of the invention is higher, if therefore it is single interim steel bracket need to be set up using the first construction section, Interim steel bracket construct more than on the middle and senior level than relatively hazardous therefore the second construction section of introducing in high altitude operation;Second construction Section is mainly constructed using stiff skeleton combination steel strand wires, and integral construction is convenient, is saved into without installing interim steel bracket This, improves safety.

Above-mentioned further includes steel strand wires construction procedure, and the steel strand wires construction procedure is located at the hydraulic climbing formwork and formwork reinforcement Before, the steel strand wires section construction, individual steel strand wires be installed after apply prestressing force be fixed, wherein steel strand wires with Steel strand wires are connected with each other using connector.

When steel strand wires are for the first construction section, a steel strand wires one end is anchored on king-post ground, the other end Next steel strand wires are connected by connector;When steel strand wires are for the second construction section, steel strand wires, which are beaten, to be ridden upon by stiffness bone On the angle steel that frame extends internally, guarantee steel strand wires in the construction process vertically upward;When the first construction section or/and the second construction section After steel strand wires are constructed, prestressing force stretching is carried out to steel strand wires by prestressing force strainer.

The installation of steel strand wires: by steel strand wires end anchorage in cushion cap;Specifically, it before Construction of Pylon, needs to lay the foundations Deng at this point it is possible to first steel strand wires one end is fixed in cushion cap, with the increase of construction height, steel strand wires length increases, finally Steel strand wires be fixed at the top of king-post.

It is not easy to operate in order to avoid steel strand wires are too long in construction in the present embodiment, therefore steel strand wires are divided into multistage, every section Length be 12m-18m, in other words 15m or so.It is connected between steel strand wires segmentation using connector.

In the present embodiment, when several steel strand wires are connected, it is provided with connector.Specifically, in the biggish junction of radian Connector is set, so that every section of steel strand wires, at 15 meters or so, segmentation is installed and tensioning.

In addition the side of steel strand wires is also surrounded with bellows.After additionally mounted, U-shaped reinforcing bar positions bellows Onto the angle steel of mounted strength type skeleton, in addition to reducing the disrepair phenomenon of bellows, increased outside bellows Spiral wire gum sleeve, respective stage bellows again remove protection sleeve pipe when positioning.This measure effectively avoids wave The damaging problem of line pipe.By angle steel and U-shaped steel muscle detent, construction efficiency is improved, while in terms of outer surface, construction is compared It is beautiful.

In the present embodiment, since king-post vertical prestressing steel strand wires are using anchor formula is split, steel strand wires is caused to be in exposure shape State is influenced by rainy season and Hunan wet weather, and common steel strand wires are easy to appear corrosion problem, once steel strand wires corrode, it is difficult to it repairs It is multiple.In order to preferably avoid the corrosion problem of steel strand wires, original common steel strand wires are adjusted to epoxy spray steel strand, effectively Avoid the corrosion problem of steel strand wires.

It further include curing in the mold and demoulding step finally after concrete placings step finishes;The curing in the mold is logical It crosses healthy liquid and is applied to concrete surface and conserved;The demoulding forms king-tower king-post to demould using release agent.

It further include the cooling of the heat preservation and concrete to template outer surface wherein in concrete placings step.By to template Heat preservation and concrete cooling are carried out, the concrete component internal-external temperature difference formed after pouring can be reduced, improves concrete component Intensity.

Heat preservation to template outer surface is specially to fix insulating layer in outer mould surface when construction environment temperature is lower than 5 DEG C, Simultaneously in insulation layer surface covering and heat insulating plate.I.e. when the temperature is too low, isothermal holding is carried out to outer mould surface, avoids surface temperature Be lost it is too fast, reduce internal-external temperature difference, prevent concrete cracking.

The cooling of concrete, specially when construction environment temperature be higher than 35 DEG C when, concrete be poured when using cooling-water machine into Row ice water mix.Concrete component molding temperature is mainly reduced at this time, it is made to differ less with surface low-temperature.

By the above implementation steps, king-tower king-post of the invention can be formed, the king-tower king-post after forming is by several A straightway king-post is mutually spliced, and constitutes the arcuate structure of king-tower king-post.By adjusting the length of straight-line segment, one Aspect is easy construction, on the other hand, arcuate structure easy to form.

Each straightway king-post passes through the first construction segment process or the second construction segment process pours.And each straight line 4.5 meters of standard knot length of the king-post of section, whole king-tower king-post pass through the angle change of 23 straightways, form arcuate structure. Such as the structural schematic diagram that Fig. 1 is whole king-post.

Embodiment 2

In the present embodiment, need to construct to clear magnificent main tower of bridge king-post mechanical energy, clear China's main tower of bridge king-post uses outside The big curve lotus flower moulding of sweep 325m, inside curve radius 270m, 300m composition, high 100.8m, 23, single pier point are applied Work segment, standard knot high 4.5m, concrete grade C55, and be mass concrete engineering, the construction time crosses over winter, mixes Solidifying soil control splits that difficulty of construction is big;King-post construction uses construction process of hydraulic climbing form, and interior outside king-post Curve Design is different, increases Climbing formwork for construction difficulty is added;Vertical prestressing steel strand wires are set in king-post, single for up to 52.54m most weighs about 6t.

The Xiang Tan G320 is located at xiangtan, hunan province city around city line first stage of the project, is Hunan Province's key project, and overall length 5.1km is total It is divided into three contract sections, the first and third contract section is major urban arterial highway, and the second contract section is clear magnificent Xiangjiang River Bridge.In conjunction with Xiangtan City The saying of " one scape of a bridge, Xiang Tan are also known as Lian Cheng ", clear China's Xiangjiang River Bridge are designed as single-tower self-anchored asymmetric suspended-cable structure, wherein Bridge main tower integrally uses lotus flower moulding.

Clear China's Xiangjiang River Bridge overhead is steel construction ornamental blocks, and main body is C55 prestressed reinforced concrete portal frame Structure, the high 100.8m of king-post, curve is radius 325m circular curve on the outside of king-post, and king-post inside curve is radius 270m circular curve. King-post section is using anisotropic variable cross-section form.Vertical 270 grades of 19s15.2 low relaxed prestress steel strands, same section are set in king-post Most 17, single prestressing force is for up to 53.534m, and most weigh 1119.878kg.

This engineering using vertical prestressing and hydraulic climbing formwork synchronize climb arrangement and method for construction, wherein concrete quality, it is vertical in advance Prestress steel strand construction, lotus-shaped flower king-post line type control are construction Difficulties, and vertical prestressing is promoted, stretching construction difficulty is big.

Single-tower self-anchored suspension bridge case history is relied on, big curve lotus-shaped flower thin-walled Construction of Pylon key technology is ground Study carefully.According to field laboratory's model test and field test data, summer and the winter construction match ratio of thin-walled king-post are determined, it is excellent Select the maintenance plan of release agent, curing fluid and heat insulation formwork;Pass through the equitable subsection Optimizing construction to vertical prestressing steel strand wires Length, scientific selection improve anti-corrosion ability, the protection of construction innovation strengthening process, it is ensured that steel strand wires do not occur in the construction process Corrosion and destruction;The numerical model that king-post is established using Midas numerical value software for calculation determines every pre- deviator of section king-post in advance, and The lotus flower moulding guaranteed with the bent section construction of straight generation is used, final king-post position deviation controls within 1cm.By to big curve lotus Flower pattern thin-walled Construction of Pylon key technology research effectively ensures concrete perception, vertical prestressing construction and the lotus of king-post Flower moulding has accumulated experience for the construction of subsequent similar engineering.

In the present embodiment, king-tower king-post uses the construction technology of hydraulic climbing formwork, main working procedure: stiff skeleton installation → Reinforcement installation → presstressed reinforcing steel fixes → hydraulic climbing formwork and formwork reinforcement → concrete placings → curing in the mold → demoulding.

The cambered design of king-post mainly passes through the construction method " with straight Dai Qu ", and king-tower king-post short transverse is divided into 23 Section, standard knot height 4.5m, each segment are straightway, form circle arc curve by the angle change of 23 straightways.

King-tower king-post is constructed there are more construction Difficulties, by analysis, is summarized as follows:

(1) for king-tower king-post using arc, section abnormal shape, variable cross-section form, the particularity difficulty of construction of structure is larger.

(2) more vertical prestressing is set inside king-post, and prestressing force uses the form for splitting anchor, needs first lashing after-pouring mixed Solidifying soil.Positioning, support and the protection of vertical steel strand wires are more difficult,

(3) king-post construction is high altitude operation, and security risk is high.

(4) Construction of Pylon is project critical task, and the construction duration directly affects Project duration, schedule requirement It is high.

Steps are as follows for Specific construction:

King-post construction is carried out according to the prior art for the first construction section of bottom, the second construction section is described in detail.

The first step, stiff skeleton installation: using the arch stiffness steel truss first installed as construction bracket, and by stiffness bone Each, frame perpendicular, transverse truss packet forms king-post cross-sectional configuration, the stiff skeleton cross-sectional configuration includes several straight lines with concrete Section, angle is formed between adjacent straightway;

Specifically, stiff skeleton installation the following steps are included: (1) at the scene by design carry out skeleton 1:1 setting-out, blanking, Processing and segmented assembly molding.(2) installation, the arching of skeleton are carried out using erection with cableway.To steel tube concrete soil skeleton at It also needs to pour pipe inner concrete using pumping method after steel pipe skeleton, to form final skeleton structure.(3) mould is hung on skeleton Plate casting concrete arch ring (divides ring, segmentation, Multi-working-surface to carry out).

In the present embodiment, the 2nd~21 high 4.5m of segment standard knot of stiff skeleton.Always high 4.9m (is wrapped for the segment stiff skeleton head It is pre-buried to include coxopodite), the pre-buried bottom end of coxopodite is embedded to 0.3m in tower seat, stretches out the outer 0.2m of tower seat.Stiff skeleton should meet receiving steel The requirement of the structure stresses such as twisted wire and reinforcing bar weight will more ensure that king-post line style meets design requirement, realize the interior of lotus-shaped flower king-post The requirement of outside camber line line style.

King-post facade is curved shape Sarasota, and outside curve is the circular curve of radius 325m, and king-post inside curve is radius The circular curve of 270m, 300m, interior outside king-post Curve Design is different, and difficulty of construction is larger.

In the present embodiment, king-tower uses variable cross-section form, i.e. its cross-section diagram 2 is as follows.So-called variable cross-section, refers in cross-section diagram A value can constantly become larger with the increase of king-post absolute altitude.Stain in Fig. 2 is the steel strand wires in stiff skeleton.

Second step, the installation of steel strand wires: by steel strand wires end anchorage on king-post ground;

In this step, due to steel strand wires can getting higher with king-post height, continue growing, for reasonable construction, this implementation In example, 24 connectors (YJ15-19) are increased in the position of absolute altitude 77.8m, 96.8m, 113m by design alteration, divide 3 sections The construction of (18m, 18m, 16.2m) progress N3, N4 steel strand wires.

King-post construction, need to make vertical steel strand wires generally vertical, and since original design steel strand wires length is big, weight is big, makes its guarantor Vertical more difficulty is held, interim steel bracket need to be set up, fall within steel strand wires weight on steel bracket, then carry out strength type skeleton and steel The installation of tendons skeleton.And the installation of interim steel bracket not only consumable material and labour, but also belong to high altitude operation, risk compared with It is high.By design alteration, 8~20 section steel strand wires will be divided into three sections, the weight of steel strand wires is relatively small, can be by steel strand wires weight Amount is directly fallen on strength type skeleton.The installation for avoiding steel bracket improves safety coefficient and construction efficiency,

King-tower vertical prestressing steel strand wires design length is 31.5m~52.3m, and lifting link has mill in work progress Consumption;Common steel strand wires corrosion-vulnerable, influences steel strand wires performance in prestress wire work progress.To ensure that king-tower is vertically answered in advance The vertical steel strand wires of king-tower are used epoxy spray steel strand by design alteration, improve steel strand wires by the safety and quality of power construction Anti-corrosion ability, to ensure smooth construction.

Third step, prestressed positioning: steel strand wires are positioned by angle steel, keep steel strand wires vertical;Adjacent prestressing force position Between positioned by bellows;

4th step, prestressed application: the fixed steel strand wires of stiff skeleton vertical direction apply prestressing force, by pre- Stress strainer carries out prestressing force stretching to steel strand wires.

In the present embodiment, to avoid epoxy coating prestress wire that breakdown of coating occurs in work progress, and lead to steel Twisted wire corrosion, the bellows of king-post pre-stress construction is using high-intensitive, high tenacity corrugated conduit, and ripple tube thickness is by common It is 5mm that the 3mm of bellows, which thickeies,;Bellows is protected using the plastic protective sleeve of steel wire, is formed on the outside of bellows One layer of protective case with certain rigidity and toughness, avoids the bellows with steel strand wires from destroying in hoisting process.

Specifically, above-mentioned protective case is spiral wire gum sleeve, effectively avoids the damaging problem of bellows.

In the prior art, bellows positioning uses groined type reinforcing bar, by bellows and steel strand wires weight transmitting to reinforcing bar On frame.After this technique will require framework of steel reinforcement to install, bellows positioning can be carried out, groined type reinforcing bar just has impetus, right In wall thickness, only one meter of king-post, bellows positioning operation personnel need to enter framework of steel reinforcement inside processing, and operating space is very narrow, Construction efficiency is extremely inefficient.

On the basis of carrying out site inspection and analysis, both sides process modification is proposed in the present embodiment:

(1) vertical angle steel auxiliary positioning.When stiff skeleton is installed, by surveyor's positioning vertical prestressing position, at it A straight ∠ 80*10 angle steel is fixed in corresponding position, and bellows smoothly positions upwards along angle steel, and positioning bar spacing is according to setting Count 80cm setting together, positioning bar uses U-shaped steel muscle detent.

(2) construction adjustment.Traditionally, bellows positioning should construct after framework of steel reinforcement installation, cause to make Industry personnel operating space is narrow.After vertical angle steel auxiliary positioning, bellows positioning can be after the installation of strength type skeleton, reinforcing bar It is carried out before frame installation, more well-to-do operating space is provided for operating personnel.

By the process optimization in terms of two above, bellows installation speed is not only increased, also improves bellows peace Fill precision and straight degree.

The reinforcement installation of stiff skeleton: 5th step along arch ring cross-sectional configuration, constructs outer cloth in the arch ring whole cross section If reinforcing bar, reinforcing bar is laid on the outside of stiff skeleton by binding;

6th step, hydraulic climbing formwork and formwork reinforcement: being arranged external mold on the outside of reinforcing bar, along the arch ring cross-sectional configuration, every 2-3 One piece of external mold is arranged in a straightway, and the external mold is fixed, and is formed and is poured between the external mold and the arch ring cross-sectional configuration Infuse chamber

King-post is constructed using hydraulic climbing formwork method.To guarantee king-post line style, use with the arrangement and method for construction of straight Dai Qu, king-post clear height 108m work point is 23 each segments, and every section vertical height is 4.5m, according to king-post line style radian, template configuration Height Standard height 4.67m, frame body uses ZPM-100 type hydraulic self-creeping formwork, can effectively guarantee the duration, safe and effective to construct.

The general thinking of installing engineering stencil design, according to cross-section diagram, each straightway is designed as one piece of template, segmental arc by In too long, it is divided into two sections.According to this mentality of designing, king-post external mold need to be designed as 9 pieces, and (every section of king-post refers to vertical direction merogenesis One group of external mold is arranged in section, every section king-post, and every group of external mold is divided into 9 pieces of templates).Every section tower column formwork construction is both needed to 9 pieces of templates point Is not positioned and reinforced, larger workload, and segment template piecemeal is smaller.

Piecemeal optimization can be carried out to template in order to facilitate construction, smaller piecemeal is merged, i.e., by number 3,8 piecemeal templates point It is not incorporated to number 2, in 9 piecemeal templates.So that template system is divided into 7 pieces, reduce the piecemeal of template, improves the installation speed of template Degree.

In the present embodiment, according to former design requirement, for the vertical steel strand wires of king-post at 50 meters or more, this gives site operation band Problems are carried out.In order to facilitate construction, my portion is linked up with designing unit, is proposed with regard to the prestress wire between tower 8-20 section Modification application.King-tower upper king-post strut prestressing force is changed to 4 sections, increases connector at 12 sections, 16 sections respectively, so that every section of steel twists Line is at 15 meters or so, segmentation installation and tensioning.

Concrete placings: 7th step carries out casting shape to formation casting chamber between template and stiff skeleton construction by concrete At thin-walled king-post;

In the present embodiment, king-tower is generally big curve lotus-shaped flower thin-walled king-post, concrete C55, and top absolute altitude is 124.8m, clear Hua Da bridge big curve lotus-shaped flower thin-walled king-post construction time cross over summer and winter, face river surface in construction work The adverse weathers stake holes situation such as strong wind, altitude low temperature be easy to cause concrete strength loss and outer surface cracking.

The intensity of concrete when in order to reinforce casting, the concrete in the present embodiment, match ratio use winter and summer two Kind formula, winter match ratio are shown in Table winter match ratio in 1 based on increasing the heat of hydration and keep the temperature;It is more according to Hunan locality high temperature The climatic characteristic of rain, hot weather construction match ratio, using the scheme for reducing the heat of hydration, are shown in Table 1 under the premise of guaranteeing concrete strength Middle summer match ratio.

Table 1

When casting and constructing, according to season difference, different working measures is taken:

Do the following in hot weather construction: (1) summer uses cooling-water machine, concrete molding temperature is reduced, using ice The concrete heating etc. of water mix, reduction in transit;(2) cooling tube is buried in the mass concrete component of king-post bottom, By the circulation of cooling water, the heat of hydration of inside concrete is taken away in time;(3) temperature measuring equipment is buried in inside concrete, at any time Monitored concrete internal-external temperature difference.

Clear Hua Da bridge tower pillar height degree 108m, by the big wind effect in high-altitude in work progress, concrete surface dehydration is too fast, thus Generate cracking;It in winter in work progress, is influenced by upper air current, concrete surface cooling is very fast, causes in thin wall concrete The outer temperature difference is larger, and generates Temperature Cracks.

In order to solve this problem of king-post face crack, project management department takes two o'clock measure: (1) heat insulation formwork.It is hydraulic to climb Mould is made of template, wooden H-beam and annular back cord, in order to increase the thermal insulation property of template, hydraulic climbing formwork wooden H-beam it Between template on the outside of paste geotechnological cotton with a thickness of 2cm, covering fixation is carried out using three-ply board on the outside of geotechnological cotton, by giving template The method of " wearing cotton-wadded quilt " is kept the temperature, and the temperature for reducing concrete outer surface is scattered and disappeared.(2) extend striking time.According to site operation temperature Degree and construction need, and when temperature is less than 5 DEG C, the time of king-post curing in the mold is no less than 72 hours, reduce surface temperature and are lost.

Curing in the mold: 8th step conserves the thin-walled king-post formed after casting by healthy liquid hair;

If being conserved not in time after concrete casting, moisture can evaporate too fast in concrete, can make to have formed gelinite Cement granules cannot abundant aquation, influence the intensity of concrete.In order to ensure the appearance matter of big curve lotus-shaped flower thin-walled king-post Amount carries out field test, test result such as table 2 to natural curing, covering watering, steam curing, healthy liquid method;Test result table Bright: healthy liquid method is relatively adapted to big curve lotus-shaped flower thin-walled king-post construction.

Table 2

Demoulding: 9th step is demoulded using release agent, that is, forms king-tower king-post.

In this city embodiment, in order to ensure the presentation quality of big curve lotus-shaped flower thin-walled king-post, template paint, aqueous de- is selected Mould agent, hydraulic oil, salad oil carry out field test, and being compared analysis by model pier block, the results are shown in Table 3:

Table 3

Serial number Release agent Presentation quality Blibbing Construction Applicability 1 Template paint It is best At least It is difficult to clean off It is not applicable 2 The release agent self-sufficient and strategically located region (TF-9) Preferably It is less It is convenient to construct It is applicable in 3 Hydraulic oil Color difference is obvious It adds Binding dust It is not applicable 4 Salad oil Quality is general It is more Binding dust It is not applicable

Show by site-models Experimental Comparison: the self-sufficient and strategically located region (TF-9) bridge new type release agent release agent is relatively suitable for lotus flower The construction of type king-post, concrete perception is preferable, and presentation quality is stablized.

In the present embodiment, before construction, the numerical model of king-post is established using Midas numerical value software for calculation, is calculated every The offset generated after king-post concreting with the king-post after vertical prestressing tensioning is saved, so that it is determined that the final offset of king-post Numerical quantity.According to numerical result, pre- deviator is set in king-post setting-out, outside camber line in the king-post effectively ensured, really Protect the shape of lotus-shaped flower king-post.

It is as shown in table 4 that the specific pre- deviator computation model of king-post and 1-20 save pre- deviator calculated value:

Table 4:

In construction, Intensified Observation is used in the present embodiment, the mode of dynamic guidance is specific as follows:

(1) surveying and locating

Every section king-post measuring sequence is followed successively by king-post stiff skeleton positioning → king-post creeping formwork Corner character → king-post creeping formwork mould Plate repetition measurement → king-post concrete angle point review.According to king-post cross sectional shape, select 7 angle points of variable cross-section as plane setting-out control It is processed, in setting-out and compound nucleus process, setting-out is carried out using method of polar coordinates by 4 control points of Xiang River two sides using total station, King-post is checked using double backsight methods.

(2) day and night temperature

Since temperature and sunlight irradiation cause king-post two sides temperature difference to be expanded with heat and contract with cold so as to cause concrete in the daytime, King-tower proceeds to Section 17, and selection is measured under night measuring condition stable case and is compared with measurement data in the daytime;Number It is to meet oxygen evolution rate requirement within 3mm according to comparison display error.

King-post daytime and measurement comparison at night are as shown in table 5:

Table 5

(3) line style repetition measurement

It is adopted after concreting completion and demoulding completion in order to further determine the construction quality of king-tower line style Concrete corner location is measured with Lycra total station TS30, and observation time is selected in front of the sun comes out, generally morning, specific tower Column line style repetition measurement summarizes data and is shown in Table 6, unit mm.

Table 6

(4) settlement observation

In order to observe king-post in work progress and the sedimentation situation after binding, king-post Section of five 46.4m, Section 23 Observation point is set at 124.8m, and the pre-buried prism on king-post outer side center line carries out settlement observation.End up to the present, Observation 16 times, king-post is settled between -5~4mm (such as Fig. 3), substantially can be measurement error, and king-post settles very little.

The traditional handicraft that clear China's Xiangjiang River Bridge lower king-post strut (1~8 section) uses, construction efficiency are told somebody what one's real intentions are.Since Section nine into Process optimization is gone, magnificent Xiangjiang River Bridge king-post king-post clear at present has been constructed completion, we unite to each segmental construction period Meter, such as following table.The standard knot construction period that is averaged is 14 days before process optimization, and the standard knot construction period that is averaged is after process optimization 7.3 days, work efficiency improved 92%.After process optimization, amount to 15 section king-posts of construction, so that Construction of Pylon decreased duration 15* (14-7.3)=101 day.

7 king-tower king-post standard knot construction period statistical form of table

4.2 direct economic benefit

The saving of duration, reduces the consumption of labour, while also saving the lease time of tower crane.Duration saves 101 It, the equipment leasing expense and labour cost of generation are 208.06 ten thousand yuan total.

The direct economic benefit computational chart that 8 process optimization of table generates

Serial number Project Quantity Unit price Time Expense (Wan Yuan) 1 Administrative staff 8 350 members/person/day 101 days 28.28 2 Operator 35 280 yuan/person/day 101 days 98.98 3 Tower crane 2 4000 yuan/platform/day 101 days 80.8 It is total 208.06

4.3 other benefits

(1) construction efficiency improves, and the duration is guaranteed

Construction of Pylon is project key job, and the reduction of duration directly affects Project duration.King-tower king-post is applied The raising of work work efficiency has ensured the constructing aims of clear magnificent Xiangjiang River Bridge, realizes that nine China dock with the comprehensive of Zhaoshan Hill as scheduled, effectively pushes away The development of dynamic Xiang River scenic belt along river.

(2) reduce steel bracket installation, safety coefficient is high

When steel strand wires support platform putting up platform and dismounting, hoisting and hanging operation is more, and risk is larger.Optimized using activity Have construction method, avoid platform set up and remove and cross-operation, safety coefficient are high.

(3) prestressing force is linearly more smooth, and construction quality is guaranteed

Steel strand wires are not only shortened by vertical angle steel, positioning time is installed, also improve the positioning accuracy of steel strand wires and suitable Straight degree, meanwhile, increase spiral wire rubber protecting jacket pipe on the outside of bellows, avoids the disrepair phenomenon of bellows, prestressing force Quality is guaranteed.

By lotus-shaped flower king-post pre-stress construction, the studies above of concrete construction and king-post line type control key technology, The above-mentioned construction technology of lotus-shaped flower thin-walled king-post is determined, pillar thin-wall construction king-post intensity is qualified, does not occur crack phenomenon, whole Body perception is preferable;Corrosion, bellows disrepair phenomenon do not occur for steel strand wires in king-post vertical prestressing work progress, it is determined that vertical The reliable process of pre-stress construction;Lotus-shaped flower king-post line style meets design requirement, and curve is soft, and body is graceful, in Xiangjiang embankment Pour the clear magnificent spine for having erected that a reliable in quality, technology are novel, shape is graceful.

The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its Equivalent thereof.

Claims (10)

1. a kind of king-tower king-post construction technology, which comprises the following steps:
King-tower king-post is divided into two construction sections from bottom to top, the construction section includes the first construction section and position positioned at bottom The second construction section more than the first construction section;
First construction section carries out king-post construction by setting up bracket;
Second construction section carries out king-post construction by setting up stiff skeleton, and what the stiff skeleton constituted king-post second applies The side of the whole bar construction of workshop section, the stiff skeleton is made of several reinforcing bars interconnected, the stiff skeleton Inside setting steel strand wires installation space;
Hydraulic climbing formwork and formwork reinforcement: being arranged several pieces of inner and outer templates on the outside of stiff skeleton, and inner and outer template is fixed by bolts, Casting chamber is formed between the external mold and the stiff skeleton;
Concrete placings: the casting concrete between inner and outer template forms thin-walled king-post.
2. a kind of king-tower king-post construction technology according to claim 1, which is characterized in that further include steel strand wires construction step Suddenly, the steel strand wires construction procedure is located at before the hydraulic climbing formwork and formwork reinforcement, the steel strand wires section construction, individually Steel strand wires apply prestressing force after being installed and are fixed, and wherein steel strand wires and steel strand wires are connected with each other using connector.
3. a kind of king-tower king-post construction technology according to claim 2, which is characterized in that the side of the steel strand wires also ring It is provided around bellows.
4. a kind of king-tower king-post construction technology according to claim 1, which is characterized in that further include curing in the mold and de- Mould step;
The curing in the mold is to be applied to concrete surface by healthy liquid to be conserved;The demoulding is de- using release agent Mould forms king-tower king-post.
5. a kind of king-tower king-post construction technology according to claim 1, which is characterized in that in the concrete placings step, also Cooling including heat preservation and concrete to template outer surface.
6. a kind of king-tower king-post construction technology according to claim 5, which is characterized in that the guarantor to template outer surface Temperature is specially when construction environment temperature is lower than 5 DEG C, in the fixed insulating layer of outer mould surface, while in insulation layer surface covering and heat insulating Plate.
7. a kind of king-tower king-post construction technology according to claim 5, which is characterized in that the cooling of the concrete, tool Body is to carry out ice water mix using cooling-water machine when concrete is poured when construction environment temperature is higher than 35 DEG C.
8. a kind of king-tower king-post construction technology described in one of -7 according to claim 1, which is characterized in that the king-tower king-post is logical It crosses several straightway king-posts to be mutually spliced, and constitutes the arcuate structure of king-tower king-post.
9. a kind of king-tower king-post construction technology according to claim 8, which is characterized in that each straightway king-post is equal It is poured by the first construction segment process or the second construction segment process.
10. a kind of king-tower king-post construction technology according to claim 8, which is characterized in that the tower of each straightway 4.5 meters of the standard knot length of column, whole king-tower king-post pass through the angle change of 23 straightways, form arcuate structure.
CN201811402688.0A 2018-11-23 2018-11-23 A kind of king-tower king-post construction technology CN109468958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811402688.0A CN109468958A (en) 2018-11-23 2018-11-23 A kind of king-tower king-post construction technology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811402688.0A CN109468958A (en) 2018-11-23 2018-11-23 A kind of king-tower king-post construction technology

Publications (1)

Publication Number Publication Date
CN109468958A true CN109468958A (en) 2019-03-15

Family

ID=65673201

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811402688.0A CN109468958A (en) 2018-11-23 2018-11-23 A kind of king-tower king-post construction technology

Country Status (1)

Country Link
CN (1) CN109468958A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102561197A (en) * 2012-01-11 2012-07-11 中铁大桥局股份有限公司 Method for construction of stiff skeleton and banding of tower column rebars
CN103741601A (en) * 2013-06-28 2014-04-23 中交第三航务工程局有限公司 Tower, beam and cable synchronous bridge forming technology
KR101624627B1 (en) * 2016-01-14 2016-05-26 주식회사 성화씨앤비 Girder and bridge construction method thereof
JP2018091093A (en) * 2016-12-06 2018-06-14 三井住友建設株式会社 Bridge construction method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102561197A (en) * 2012-01-11 2012-07-11 中铁大桥局股份有限公司 Method for construction of stiff skeleton and banding of tower column rebars
CN103741601A (en) * 2013-06-28 2014-04-23 中交第三航务工程局有限公司 Tower, beam and cable synchronous bridge forming technology
KR101624627B1 (en) * 2016-01-14 2016-05-26 주식회사 성화씨앤비 Girder and bridge construction method thereof
JP2018091093A (en) * 2016-12-06 2018-06-14 三井住友建設株式会社 Bridge construction method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
卜亚君: "马鞍山长江公路大桥左汊主桥中塔下塔柱施工", 《城市建设理论研究》 *

Similar Documents

Publication Publication Date Title
CN101935987B (en) Construction method for integrally sliding large-span steel pipe arch of curved bridge
CN102587296B (en) Self-balancing external prestressing strengthening method for bridge structure
CN101781931B (en) Construction method of large-volume concrete bearing platform with one-time pouring in winter
Menn Prestressed concrete bridges
CN102561213B (en) Steel plate-concrete composite structure reinforcement method of structural negative moment region
CN100567644C (en) A kind of joist type cable arch bridge structure and job practices
CN101982629B (en) Assembly-type self-compaction steel tube and concrete composite structure
CN101538896A (en) Construction method for jettied structure at high attitude of high-rise building
CN105926444B (en) A kind of concrete arch-type bridge arching method
EP0960986A3 (en) Process and device for the construction of tall, hollow, towerlike structures of two hundred meters height and more, specially wind generator towers
CN101413251B (en) 0 type block anti-cracking construction method of high pier large across creeping formwork
CN101481930B (en) Construction structure for textile reinforced composite reinforced bar concrete and manufacturing method thereof
CN103088750B (en) Especial-big span suspension bridge of uniparted hyperboloid space rope net main cable and construction method thereof
CN106284044B (en) A kind of novel steel-concrete combined bridge and its construction method
CN102877418A (en) Stentless urban bridge anti-collision guardrail construction method and cradle vehicle and gun carrier thereof
CN101831875A (en) Precast assembly process of prestressed concrete cylindrical hollow pier
CN101845850A (en) Strengthening concrete frame structure and construction method thereof
CN102392549B (en) Construction working method for seamless prestressed-concrete self-waterproof clean water reservoir
CN102243671B (en) Method for analyzing temperature gradient effect of flat steel box girder of long-span steel bridge
CN101368371A (en) Cast-in-situ continuous beam construction method for special railway line stands
CN101864744B (en) Construction method of novel wall fence for highway
CN102041809A (en) Construction method for nuclear island raft foundation of nuclear power station
CN106702910B (en) A kind of main girder construction technique of the double rope face low-pylon cable-stayed bridges of double tower
CN103741601A (en) Tower, beam and cable synchronous bridge forming technology
CN203795291U (en) Bearing-free prestressed concrete continuous rigid frame bridge with single-wall piers

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination