CN107227814A - A kind of large cantilever concrete structure section construction method - Google Patents

A kind of large cantilever concrete structure section construction method Download PDF

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Publication number
CN107227814A
CN107227814A CN201710465270.3A CN201710465270A CN107227814A CN 107227814 A CN107227814 A CN 107227814A CN 201710465270 A CN201710465270 A CN 201710465270A CN 107227814 A CN107227814 A CN 107227814A
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CN
China
Prior art keywords
section
encorbelmenting
concrete structure
construction
footing
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CN201710465270.3A
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Chinese (zh)
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CN107227814B (en
Inventor
徐小洋
季文涛
刘兴军
白贺昶
王伟
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China Construction Second Engineering Bureau Co Ltd
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China Construction Second Engineering Bureau Co Ltd
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Priority to CN201710465270.3A priority Critical patent/CN107227814B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32Floor structures wholly cast in situ with or without form units or reinforcements
    • 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
    • E04G11/00Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/40Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings for coffered or ribbed ceilings
    • 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
    • E04G11/00Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48Supporting structures for shutterings or frames for floors or roofs
    • 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
    • E04G17/00Connecting or other auxiliary members for forms, falsework structures, or shutterings
    • 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
    • E04G17/00Connecting or other auxiliary members for forms, falsework structures, or shutterings
    • E04G17/16Members, e.g. consoles, for attachment to the wall to support girders, beams, or the like carrying forms or moulds for floors, lintels, or transoms

Abstract

A kind of large cantilever concrete structure section construction method includes step following steps one:According to the size of encorbelmenting for concrete structure of encorbelmenting, concrete structure to be onstructed of encorbelmenting is divided into the first construction section and the second construction section;Step 2:In the agent structure below concrete structure to be onstructed of encorbelmenting, scaffold support is laid along the frame edge of agent structure;Step 3:Carry out the construction of the first construction section concrete structure to be onstructed of encorbelmenting;Step 4:The pre-buried anchor ring on the lateral surface of concrete structure upper body structure to be onstructed of encorbelmenting;Step 5:Drawn between agent structure and scaffold support above concrete structure of encorbelmenting and set suspension cable;Step 6:Support member is set between scaffold support and the frame column of agent structure;Step 7:Carry out the construction of the second construction section concrete structure to be onstructed of encorbelmenting.Section that the present invention solves scaffold support in conventional construction method is big, the scaffold scale of construction is big, uneconomical and the too big irrealizable technical problem of height.

Description

A kind of large cantilever concrete structure section construction method
Technical field
The invention belongs to building field, more particularly to large cantilever concrete structure construction method.
Background technology
Large-scale high-rise public building sets the concrete large cantilever concrete of prominent exterior wall in order to meet building requirements, often Structure, its form bracing system turns into the construction Difficulties of total.Because concrete structure of encorbelmenting is high apart from ground, using falling Ground formula support system is all infeasible in economy, technology, using choosing support frame or the pure supporting construction of encorbelmenting of shaped steel outside simple steel pipe Limited again by cantilever span;Traditional method is usually the method for once adding support or wire rope inclined-pulling with shaped steel, but traditional Construction method haves the shortcomings that following:1. shaped steel is encorbelmented completes as formwork platform one-time-concreting of encorbelmenting, and so to meet pin hand The strength and stiffness requirement of frame transmission load, shaped steel section is big, and transport and processing difficulties, end reaction are big, and easily structure is made Into destruction;2. the full hall scaffold scale of construction is big, long in time limit, uneconomical and can not be simultaneously in lower section construction, and height can not be realized greatly very much; 3. the form of section steel beam is added using multiple tracks bearing diagonal, this scheme steel using amount is big, and built-in fitting is more, the supported underneath welding in high-altitude is tired Hardly possible is, it is necessary to set up process operation frame;4. multiple tracks drag-line form is used, top node pulling force is big, generally requires to be divided into multiple drawknots Point, pre-buried dowel is more, needs to set up excessive linking beam drag-line more.
The content of the invention
The present invention proposes a kind of large cantilever concrete structure section construction method, to solve in conventional construction method to pin The section of hand cradle support is big, easily agent structure is damaged, the full hall scaffold scale of construction of use is big, long in time limit, uneconomical, Height can not be realized greatly very much, it is necessary to set up process operation frame and need to use the technical problem of multiple tracks drag-line form.
To achieve the above object, the present invention is adopted the following technical scheme that.
A kind of large cantilever concrete structure section construction method, including step are as follows.
Step one:According to the size of encorbelmenting for concrete structure of encorbelmenting, concrete structure to be onstructed of encorbelmenting is divided into first and applied Workshop section and the second construction section;Wherein the first construction section is outwards encorbelmented 2.5m ~ 3.5m, the second construction section along main structural frame edge Outwards encorbelmented 3.0m ~ 3.5m along the outward flange of the first construction section.
Step 2:In the agent structure below concrete structure to be onstructed of encorbelmenting, spread along the frame edge of agent structure If scaffold support, one end of scaffold support is fixed on the body construction, and the other end of scaffold support exceeds agent structure Frame edge, encorbelments in outside the side of agent structure, and encorbelment size and the concrete structure to be onstructed of encorbelmenting of scaffold support Encorbelment size be adapted.
Step 3:Carry out the construction of the first construction section concrete structure to be onstructed of encorbelmenting;It is as follows that specific method includes step.
Step a:Set up the first paragraph beam footing hand cradle and first of the first construction section concrete structure bottom to be onstructed of encorbelmenting Section plate footing hand cradle;Wherein first paragraph plate footing hand cradle be inclined at the plate of concrete structure to be onstructed of encorbelmenting with it is to be onstructed outstanding Choose between the agent structure below concrete structure;First paragraph beam footing hand cradle is arranged on the beam of concrete structure to be onstructed of encorbelmenting Between the scaffold support below the beam of concrete structure to be onstructed of encorbelmenting.
Step b:The template die plate and the first construction section for setting up the first construction section concrete structure to be onstructed of encorbelmenting are to be onstructed outstanding Choose the beam forms of concrete structure.
Step c:Pour the board concrete and beam concrete of the first construction section concrete structure to be onstructed of encorbelmenting.
Step 4:The pre-buried anchor ring on the side of concrete structure upper body structure to be onstructed of encorbelmenting.
Step 5:Treat that the first construction section in step c is encorbelmented the board concrete intensity and beam concrete of concrete structure Drawn when intensity reaches design strength, between the agent structure and scaffold support above concrete structure of encorbelmenting and set oblique pull Rope, the upper end of suspension cable is fixed on anchor ring, and the lower end of suspension cable is connected to the end of scaffold support.
Step 6:Support member is set between scaffold support and the frame column of agent structure;The lower end of support member is connected It is connected on frame column, the upper end of support member is supported on the bottom of scaffold support.
Step 7:Carry out the construction of the second construction section concrete structure to be onstructed of encorbelmenting;It is as follows that specific method includes step.
Step A:Set up the second segment beam footing hand cradle and second of the second construction section concrete structure bottom to be onstructed of encorbelmenting Section plate footing hand cradle;
The second segment beam footing hand cradle and second segment plate footing hand cradle are full hall frame;And second segment beam footing hand cradle and the One section of beam footing hand cradle connection, second segment plate footing hand cradle is connected with first paragraph plate footing hand cradle.
Step B:The template die plate and the second construction section for setting up the second construction section concrete structure to be onstructed of encorbelmenting are to be onstructed outstanding Choose the beam forms of concrete structure.
Step C:Pour the board concrete and beam concrete of the second construction section concrete structure to be onstructed of encorbelmenting.
Step D:Seam between first construction section and the second construction section beam concrete is handled, while being applied to first Seam between workshop section and the second construction section board concrete is handled, and so far construction is finished.
It is preferred that, scaffold support includes along the spaced one group of type of main structural frame sides aligned parallel in step 2 Girder steel, the springboard being laid on section steel beam and enclose the protection network being located at below section steel beam;The anchoring section of the section steel beam passes through The U-shaped dowel that hoop sets above it is fixed on the body construction, and the section of encorbelmenting of section steel beam is vertically encorbelmented in the side of agent structure Outside;The U-shaped dowel is provided with one group, set along the long axis direction parallel interval of section steel beam, and two free ends of U-shaped dowel It is embedded in the floor of agent structure;The section steel beam bottom is provided with antiskid part;The antiskid part is correspondingly arranged at master The side wall both sides at body structural framing edge, and side wall is stuck in the groove of its composition.
It is preferred that, step 3 is before first paragraph beam footing hand cradle and first paragraph plate footing hand cradle is set up, in section steel beam Transversely parallel interval is connected with first paragraph beam bottom coupling beam, described first at top, the position of correspondence first paragraph beam footing hand cradle The top of Duan Liang bottoms coupling beam, vertical plug-in unit is interval with along its long axis direction;In the top of section steel beam, correspondence first paragraph plate footing Transversely parallel interval is connected with first paragraph plate bottom coupling beam at the position of hand cradle.
It is preferred that, the first paragraph plate footing hand cradle includes bearing diagonal, the first transverse horizontal bar, first longitudinal direction horizon bar With the first scissors strut;The bottom of the bearing diagonal is fixed on main structural frame edge, the upper end of bearing diagonal is outward-dipping, It is supported on the bottom of the template die plate of concrete structure to be onstructed of encorbelmenting;The first transverse horizontal bar parallel interval is connected to oblique branch Between support, the first transverse horizontal bar is connected with bearing diagonal at position of intersecting point by cruciform fastening for falsework;The first longitudinal direction horizon bar Parallel interval is connected between the first transverse horizontal bar and the intersection point of bearing diagonal, first longitudinal direction horizon bar and the first transverse horizontal bar Connected at position of intersecting point by cruciform fastening for falsework.
It is preferred that, the bearing diagonal is made up of steel pipe;It is provided with the top of the section steel beam, at the link position of correspondence bearing diagonal Plug-in unit is tilted, the bottom noose of the bearing diagonal is on plug-in unit is tilted.
It is preferred that, first paragraph beam footing hand cradle includes the first vertical rod, the second transverse horizontal bar, second longitudinal direction in step 3 Horizon bar and the second scissors strut;The bottom correspondence noose of first vertical rod is inserted in the vertical of the top of first paragraph beam bottom coupling beam On part.
It is preferred that, suspension cable described in step 5 has one group, arrangement corresponding with section steel beam, and the lower end of suspension cable is connected to Section steel beam is encorbelmented the end of section;Before drawing sets suspension cable, provided with prevention at a section bottom surface of encorbelmenting for section steel beam, close end position The antiskid part of suspension cable movement.
It is preferred that, support member described in step 6 is connected between section steel beam and the frame column of agent structure;The support The upper end of part is supported on the bottom of section steel beam.
It is preferred that, the step 7 is before second segment beam footing hand cradle and second segment plate footing hand cradle is set up, in shaped steel Transversely parallel interval is connected with second segment beam bottom coupling beam at the top of beam, the position of corresponding first paragraph beam footing hand cradle, described The top of second segment beam bottom coupling beam, vertical plug-in unit is interval with along its long axis direction;In the top of section steel beam, correspondence second segment plate Transversely parallel interval is connected with second segment plate bottom coupling beam at the position of footing hand cradle;It is vertical in the second segment beam footing hand cradle Bar bottom correspondence noose is on the vertical plug-in unit at the top of the coupling beam of second segment beam bottom;Vertical rod bottom in the second segment plate footing hand cradle End is supported at the top of the section steel beam of the second construction section.
It is preferred that, the suspension cable includes oblique pull cable elements, lower suspension cable unit and is connected to two skew cables Flower basket bolt between unit;The lower end of wherein upper oblique pull cable elements is connected with the pull bar on flower basket bolt top, lower suspension cable list The upper end of member is connected with the pull bar of flower basket bolt bottom.
Compared with prior art the invention has the characteristics that and beneficial effect.
1st, therefore section steel beam is divided into multistage continuous beam support model to the method in the present invention by method, greatly optimizes biography The stress form of support beam in the cantilevered system of system, therefore the section steel beam of the present invention is optional compared to support beam in traditional cantilevered system The small shaped steel in shaped steel section selected, shaped steel steel using amount is reduced.
2nd, in the present invention when the first construction section is constructed, because first paragraph plate footing hand cradle uses bearing diagonal, below Section steel beam directly relies on frame beam of the bearing diagonal power transmission to the edge of agent structure without stress, the load of top transmission, its Stress form rationally, saves the material usage of scaffold support system.
3rd, being applied in combination using bearing diagonal and drag-line of the scaffold support in the present invention, compared to traditional scaffold support again Play bottom and the form that multiple tracks bearing diagonal reinforces section steel beam is installed, the steel using amount brought is big, built-in fitting is more, the weldering of high-altitude supported underneath Connect difficulty, need to set up the shortcoming of process operation frame;Early stage of the present invention processing arrangement is convenient, and later stage dismounting is easy, and the When two construction sections are constructed, the section steel beam below beam, plate draws the shaped steel beam model below steel wire rope, second segment plate footing hand cradle to be Two span continuous beams, and shaped steel beam model below second segment beam footing hand cradle is three-span continuous beam, scaffold support Stability Analysis of Structures, Stress performance is good and high safety.
4th, bar dowel head is set to consolidate as plug-in unit, steel bar end one end is tilted in the present invention on the corresponding section steel beam in bearing diagonal bottom It is scheduled on the other end on section steel beam and exposes section steel beam upper surface, prevents bearing diagonal from producing sliding because of the effect of horizontal component.
5th, suspension cable includes oblique pull cable elements, lower suspension cable unit and is connected to two skew cables in the present invention Flower basket bolt between unit;The lower end of wherein upper oblique pull cable elements is connected with the pull bar on flower basket bolt top, lower suspension cable list The upper end of member is connected with the pull bar of flower basket bolt bottom;Due to suspension cable fixing end be buckled under load action have it is certain Sliding, therefore before the construction of the second construction section concrete structure to be onstructed of encorbelmenting is carried out, flower basket bolt is tightened up, makes section steel beam Encorbelment end keep horizontality, section steel beam bottom flexibility is such as caused because of the sliding of suspension cable, can continue to tighten up gaily decorated basket spiral shell Untill bolt makes its level, stabilization, so making the amount of deflection adjustment work of section steel beam becomes convenient.
6th, the beam construction joint of agent structure concrete structure to be onstructed of encorbelmenting does reinforcement processing in the present invention, is applied second The beam of workshop section vibrates again after the completion of vibrating, at the construction joint of middle part, and this construction method prevents section steel beam in deflection deformation Lower construction joint is cracking, it is ensured that the globality of beam.
7th, the shape that the scaffold in the present invention is combined using bearing diagonal scaffold of encorbelmenting with full hall pin scaffold of encorbelmenting Formula, in conventional construction method only with full hall scaffold, the scale of construction is small, short time limit, economy and energy be applied in lower section simultaneously Work, height can also be realized greatly very much.
8th, the present invention is encorbelmented concrete structure using builder's jack Construction of Supporting, and builder's jack support is encorbelmented in main body The side of structure, can construct car ramp and waterproof simultaneously below, relative to shorten the construction period.
Brief description of the drawings
Fig. 1 is the structural representation that section steel beam of the present invention is connected with agent structure.
Concrete structure to be onstructed of encorbelmenting is divided into the schematic diagram of the first construction section and the second construction section for the present invention by Fig. 2.
The positive structure schematic that Fig. 3 completes for first paragraph plate bottom scaffold building in the present invention.
Fig. 4 is the A point mplifying structure schematic diagrams in Fig. 3.
Fig. 5 is the bridging arrangement schematic diagram in the present invention during the first transverse horizontal bar spreading.
The positive structure schematic that Fig. 6 completes for first paragraph beam bottom scaffold building in the present invention.
The side structure schematic diagram that Fig. 7 completes for first paragraph beam bottom scaffold building in the present invention.
The positive structure schematic that Fig. 8 completes for second segment plate bottom scaffold building in the present invention.
Fig. 9 is first paragraph plate footing hand cradle in the present invention and the amplification of second segment plate footing hand cradle and the attachment structure of section steel beam Schematic diagram.
Figure 10 is laid on the structural representation on section steel beam for first paragraph plate bottom coupling beam and second segment plate bottom coupling beam in the present invention Figure.
The positive structure schematic that Figure 11 completes for second segment beam bottom scaffold building in the present invention.
Reference:1-agent structure, 2-section steel beam, 3-first paragraph beam footing hand cradle, 3.1-the first vertical rods, 3.2-the second transverse horizontal bars, 3.3-second longitudinal direction horizon bar, 3.4-the second scissors struts, 4-first paragraph plate footing hand Frame, 4.1-bearing diagonal, 4.2-the first transverse horizontal bars, 4.3-first longitudinal direction horizon bar, 4.4-the first scissors struts, 5- Anchor ring, 6-suspension cable, 7-second segment beam footing hand cradle, 8-second segment plate footing hand cradle, 9-U-shaped dowel, 10-antiskid Part, 11-frame column, 12-support member, 13-first paragraph beam bottom coupling beam, 14-first paragraph plate bottom coupling beam, 15-second segment beam bottom Coupling beam, 16-second segment plate bottom coupling beam, 17-the first cushion blocks, 18-the second cushion blocks, 19-frame beam.
Embodiment
As depicted in figs. 1 and 2, the agent structure 1 of the present embodiment is a Ge Liuxing hotels project, five layers of east of hotel's podium Balcony structure beam floor elevation is encorbelmented for 27.15m in side, and concrete structure of encorbelmenting goes out the 6200mm of the size of agent structure 1, is big outstanding Choose concrete structure;The beam section size of concrete structure of encorbelmenting has in six, the mm of respectively 400 mm × 1200,600 mm The mm of the mm of the mm of the mm of × 1300 mm, 300 mm × 1200,500 mm × 1300,400 mm × 1300,200 mm × 1300, most Heavy in section is 600 × 1300mm, and liftoff lower room overhead height reaches 32.1m, hotel at this four layers be swimming pool, bottom of pond absolute altitude 20m, pond top 21.2m(With the beam slab absolute altitude of four layer main body structures), four layers and five layers of floor height is 6m;To coagulation of encorbelmenting When soil structure is constructed, using the scheme of section construction;First construction section:Pre-buried U-shaped dowel 9, sets up section steel beam 2, while using pin Hand cradle sets up the formwork system for concrete structure of encorbelmenting;Second construction section:In the pre-buried anchor ring 5 in layer 6 relevant position, construct And reach after some strength, stretching wire rope, while adding type steel support part 12 under beam, taken in the second construction section of section steel beam 2 Beam, the hardened structure of concrete structure if the full other 3.2m of hall supporting frame construction encorbelments.
The specific construction procedure of this large cantilever concrete structure section construction method is as follows.
Step one:According to the size of encorbelmenting for concrete structure of encorbelmenting, concrete structure to be onstructed of encorbelmenting is divided into first and applied Workshop section and the second construction section;Wherein the first construction section is outwards encorbelmented 3m along the frame edge of agent structure 1, by four layers set up it is oblique Support scaffolding is as support system, and outwards encorbelment 3.2m for outward flange of second construction section along the first construction section;Four layers of main body The frame edge structure of structure 1 includes being connected to the frame beam 19 on the outside of curtain wall, as depicted in figs. 1 and 2.
Step 2:In the agent structure 1 below concrete structure to be onstructed of encorbelmenting, along the frame edge of agent structure 1 Scaffold support is laid, one end of scaffold support is fixed in agent structure 1, the other end of scaffold support exceeds body junction The frame edge of structure 1, encorbelments in outside the side of agent structure 1, and encorbelment size and the concrete to be onstructed of encorbelmenting of scaffold support The size of encorbelmenting of structure is adapted;Scaffold support includes the one group of type set along the frame edge parallel interval of agent structure 1 Girder steel 2, the springboard being laid on section steel beam 2 and enclosing is located at the protection network of the lower section of section steel beam 2;The anchoring section of the section steel beam 2 It is fixed on by binding round the U-shaped dowel 9 set above it in agent structure 1, the section of encorbelmenting of section steel beam 2 is vertically encorbelmented in agent structure Outside 1 side;The U-shaped dowel 9 is provided with one group, set along the long axis direction parallel interval of section steel beam 2, and U-shaped dowel 9 Two free ends are embedded in the floor of agent structure 1;Wherein close to the U-shaped dowel 9 and type of the anchoring section end of section steel beam 2 The second cushion block 18 is provided with gap between the top of girder steel 2, provided with the first pad between the bottom of 19 top section steel beam of frame beam 2 Block 17;The bottom of section steel beam 2 is provided with antiskid part 10;The antiskid part 10 is correspondingly arranged at the frame edge of agent structure 1 Basin side wall both sides, and by basin side wall be stuck in its composition groove in, as depicted in figs. 1 and 2.
As shown in Fig. 3-Fig. 7, step 3:Carry out the construction of the first construction section concrete structure to be onstructed of encorbelmenting;Specific side It is as follows that method includes step.
Step a:Set up the first paragraph beam footing hand cradle 3 and first of the first construction section concrete structure bottom to be onstructed of encorbelmenting Section plate footing hand cradle 4;Wherein first paragraph plate footing hand cradle 4 be inclined at the plate of concrete structure to be onstructed of encorbelmenting with it is to be onstructed Between the agent structure 1 encorbelmented below concrete structure;First paragraph beam footing hand cradle 3 is arranged on concrete structure to be onstructed of encorbelmenting Beam and concrete structure to be onstructed of encorbelmenting beam below scaffold support between;The type of the bottom of first paragraph plate footing hand cradle 4 Girder steel 2 is not stressed, and the operating platform and protection of a net, Dense mesh screen and springboard as people are widened on section steel beam 2.
Step b:The template die plate and the first construction section for setting up the first construction section concrete structure to be onstructed of encorbelmenting are to be onstructed outstanding Choose the beam forms of concrete structure.
Step c:Pour the board concrete and beam concrete of the first construction section concrete structure to be onstructed of encorbelmenting.
Step 5:Treat that the first construction section in step c is encorbelmented the board concrete intensity and beam concrete of concrete structure When intensity reaches design strength 100%, draw and set between the agent structure 1 and scaffold support above concrete structure of encorbelmenting Suspension cable 6, the upper end of suspension cable 6 is fixed on anchor ring 5, and the lower end of suspension cable 6 is connected to the end of scaffold support.
Step 6:Support member 12 is set between scaffold support and the frame column of agent structure 1 11;By support member 12 Lower end is connected on frame column 11, and the upper end of support member 12 is supported on the bottom of scaffold support;
As shown in figures s-11, step 7:Carry out the construction of the second construction section concrete structure to be onstructed of encorbelmenting;Specific method bag Include step as follows.
Step A:Set up the second segment beam footing hand cradle 7 and second of the second construction section concrete structure bottom to be onstructed of encorbelmenting Section plate footing hand cradle 8;First paragraph plate footing hand cradle 4 and first paragraph beam footing hand cradle 3 are not removed simultaneously;Now first paragraph plate footing The load of hand cradle 4 is supported without section steel beam 2, but by the use of agent structure 1 frame beam 19 as bearing diagonal 4.1 stress point, Vierendeel girder, the floor one-time-concretings of concrete structure leading portion 3m with five layer main body structures 1 to be onstructed of encorbelmenting, such construction joint is stayed in The middle part of concrete structure of encorbelmenting;It is full hall frame by second segment beam footing hand cradle 7 and second segment plate footing hand cradle 8;And Second segment beam footing hand cradle 7 is connected with first paragraph beam footing hand cradle 3, second segment plate footing hand cradle 8 and first paragraph plate footing hand cradle 4 Connection.
Step B:The template die plate and the second construction section for setting up the second construction section concrete structure to be onstructed of encorbelmenting are to be onstructed outstanding Choose the beam forms of concrete structure.
Step C:Pour the board concrete and beam concrete of the second construction section concrete structure to be onstructed of encorbelmenting.
Step D:Seam between first construction section and the second construction section beam concrete is handled, while being applied to first Seam between workshop section and the second construction section board concrete is handled, and so far construction is finished.
In the present embodiment, the agent structure 1 in step 2 below concrete structure to be onstructed of encorbelmenting is four layers of swimming pool Structure, twice HPB300 diameters 18mm dowel is stayed as the anchoring of section steel beam 2 when swimming pool structure is constructed on bottom of pond secondary beam The U-shaped dowel 9 of section, the benefit that U-shaped dowel 9 is anchored in bottom of pond secondary beam is to prevent leak, and section steel beam 2 is less than basin side wall beam 50mm, thus will be at the marginal position of agent structure 1 frame beam 19 on, the first cushion block of bottom pad 17 of section steel beam 2 be flitch As bearing, and bearing is set to be higher than basin side wall beam 20mm, subsequently installing scaffold support body will consider that this highly will be to be onstructed outstanding Choose the absolute altitude accurate positioning of the beam, plate of concrete structure, and the gap between the bottom of section steel beam 2 and agent structure 1 is in shaped steel It is flitch wedging with the second cushion block 18 after beam 2 is installed.
In the present embodiment, section steel beam 2 is made of 22a# I-steel, and square-section steel can be also used in other embodiments Or the shaped steel of the other forms such as H-shaped steel is made.
In the present embodiment, step 3 is before first paragraph beam footing hand cradle 3 and first paragraph plate footing hand cradle 4 is set up, in type Transversely parallel interval is connected with first paragraph beam bottom coupling beam at the top of girder steel 2, the position of corresponding first paragraph beam footing hand cradle 3 13, the top of the first paragraph beam bottom coupling beam 13 is interval with vertical plug-in unit along its long axis direction, and vertical plug-in unit is column herein Reinforcing bar;Transversely parallel interval is connected with first paragraph at the top of section steel beam 2, the position of correspondence first paragraph plate footing hand cradle 4 Plate bottom coupling beam 14;The first paragraph beam bottom coupling beam 13 and first paragraph plate bottom coupling beam 14 are that channel-section steel is made.
As shown in Figure 3 and Figure 4, in the present embodiment, the first paragraph plate footing hand cradle 4 includes bearing diagonal 4.1, and first is horizontal To horizon bar 4.2, the scissors strut 4.4 of first longitudinal direction horizon bar 4.3 and first;The bottom of the bearing diagonal 4.1 is fixed on main body In the frame edge of structure 1, the upper end of bearing diagonal 4.1 is outward-dipping, be supported on the template die plate of concrete structure to be onstructed of encorbelmenting Bottom;The parallel interval of first transverse horizontal bar 4.2 is connected between bearing diagonal 4.1, the first transverse horizontal bar 4.2 and tiltedly branch Support 4.1 is connected at position of intersecting point by cruciform fastening for falsework;The parallel interval of first longitudinal direction horizon bar 4.3 is connected to first laterally Between the intersection point of horizon bar 4.2 and bearing diagonal 4.1, the transverse horizontal bar 4.2 of first longitudinal direction horizon bar 4.3 and first is in position of intersecting point Place is connected by cruciform fastening for falsework.
In the present embodiment, the bearing diagonal 4.1 is made up of steel pipe;The top of section steel beam 2, the company of correspondence bearing diagonal 4.1 Connect provided with plug-in unit is tilted at position, the bottom noose of the bearing diagonal 4.1 is on plug-in unit is tilted.
As shown in Figure 6 and Figure 7, in the present embodiment, in step 3 first paragraph beam footing hand cradle 3 include the first vertical rod 3.1, Second transverse horizontal bar 3.2, the scissors strut 3.4 of second longitudinal direction horizon bar 3.3 and second;The bottom pair of first vertical rod 3.1 Noose is answered on the vertical plug-in unit at the top of first paragraph beam bottom coupling beam 13.
As shown in Figure 8 and Figure 11, in the present embodiment, suspension cable 6 described in step 5 has one group, with the corresponding cloth of section steel beam 2 Put, and the lower end of suspension cable 6 is connected to section steel beam 2 and encorbelmented the end of section;Before drawing sets suspension cable 6, the section of encorbelmenting of section steel beam 2 Bottom surface, the antiskid part 10 moved at end position provided with prevention suspension cable 6.
In the present embodiment, support member 12 described in step 6 is connected to section steel beam 2 and the master of the position both sides of frame column 11 Between the frame column 11 of body structure 1;The upper end of the support member 12 is supported on the bottom of section steel beam 2, apart from the bottom of section steel beam 2 Bearing horizontal range be 2000mm;The lower end of support member 12 is connected on frame column 11, apart from the bottom support bracket of section steel beam 2 Vertical distance is 2000mm;Support member 12 is made up of 12.6 channel-section steel.
Shown in Figure 11, in the present embodiment, the step 6 is setting up second segment beam footing hand cradle 7 and second segment plate footing hand Before frame 8, transversely parallel interval is connected with second at the top of section steel beam 2, the position of correspondence first paragraph beam footing hand cradle 3 Duan Liang bottoms coupling beam 15, the top of the second segment beam bottom coupling beam 15, vertical plug-in unit is interval with along its long axis direction;In section steel beam Transversely parallel interval is connected with second segment plate bottom coupling beam 16 at 2 top, the position of the scaffold 8 at corresponding second segment plate bottom; Vertical rod bottom correspondence noose in the second segment beam footing hand cradle 7 is on the vertical plug-in unit at the top of second segment beam bottom coupling beam 15; Vertical rod bottom in the second segment plate footing hand cradle 8 is supported on the top of section steel beam 2 of the second construction section;
The second segment beam bottom coupling beam 15 and second segment plate bottom coupling beam 16 are that channel-section steel is made.
As shown in Figure 8 and Figure 11, in the present embodiment, the suspension cable 6 includes oblique pull cable elements, lower suspension cable unit And it is connected to the flower basket bolt between two skew cables units;The lower end and flower basket bolt top of wherein upper oblique pull cable elements Pull bar is connected, and the upper end of lower suspension cable unit is connected with the pull bar of flower basket bolt bottom;Due to being buckled in for the fixing end of suspension cable 6 Certain sliding is had under load action, therefore before the construction of the second construction section concrete structure to be onstructed of encorbelmenting is carried out, will Flower basket bolt is tightened up, and the end of encorbelmenting of section steel beam 2 is kept horizontality, is such as caused the end of section steel beam 2 because of the sliding of suspension cable 6 Downwarp, flower basket bolt should be tightened up again makes its level, untill stablizing.
In the present embodiment, whether the first construction section or the second construction section, the section steel beam 2 below beam and plate are supported to it It is different;First construction section, 120mm slabs give four layer main body knots without the stress of section steel beam 2 by the power transmission of bearing diagonal 4.1 The frame beam 19 of structure 1, and the first vertical rod 3.1 is supported on section steel beam 2 under the beam of the cantilevered structure to be onstructed of the first construction section, type The bottom of girder steel 2 will weld 12.6 channel steel support parts 12 and be supported on frame column 11, and now the model of section steel beam 2 is two across one end Overhanging continuous beam;Second construction section, beam, the plate lower section section steel beam 2 of cantilevered structure to be onstructed draw and set the steel wire rope of suspension cable 6, The model of 3.2m section steel beams 2 of the lower section of second segment plate footing hand cradle 8 is two span continuous beams, and the lower section of second segment beam footing hand cradle 7 The model of section steel beam 2 is three-span continuous beam.
In the present embodiment, to ensure the safety of large cantilever concrete structure formwork, the frame inside four layers of agent structure 1 Set a roof beam in place, on floor using conventional vertical rod spacing 800*800mm formwork system, the body junction of the anchoring segment limit of section steel beam 2 Vertical rod step distance adjustment on structure 1 is unanimously 1200mm with the vertical rod step pitch that section steel beam 2 is encorbelmented in section, in agent structure 1 Supported, connected between horizon bar and vertical rod with cruciform fastening for falsework with horizon bar on the pond of the bottom of section steel beam 2.
As shown in Figure 4 and Figure 5, the bearing diagonal 4.1 of first paragraph plate footing hand cradle 4 is toppled due to unstable in the present embodiment Torque, by above result of calculation, the axle power of top the first transverse horizontal bar 4.2 is maximum, therefore the node of the first transverse horizontal bar 4.2 It should be noted that during the first transverse horizontal 4.2 spreading of bar, forbidding using docking, using joint form, the connection of three rotary buckles.Tiltedly Support 4.1 and the connecting node of first longitudinal direction horizon bar 4.3 and the first transverse horizontal bar 4.2 should be:Bearing diagonal 4.1 and first Vertical equity bar 4.3 is connected with cruciform fastening for falsework, and cross buckle is used between the transverse horizontal bar 4.2 of first longitudinal direction horizon bar 4.3 and first Part is connected, and forbids to be connected with rotary buckle, it is ensured that bearing diagonal 4.1 is not rotated at node.
In the present embodiment, the described bottom of bearing diagonal 4.1 bores the hole of 16mm diameters using electric drill on section steel beam 2, squeezes into The long 200mm of diameter 16mm bar dowel head exposes 100mm as plug-in unit, steel bar end driving depth 100mm is tilted, and prevents tiltedly branch Support 4.1 produces sliding because of the effect of horizontal component.
In the present embodiment, the free height that horizon bar is extended through at the top of vertical rod cannot be greater than 300mm;The calculating branch of section steel beam 2 Seat is on the frame beam 19 at the edge of agent structure 1, because frame Liang19Ding is than the low 50mm in swimming pool side wall top, thus apply flitch by its Pave and become real bearing;8# channel-section steels should be welded on section steel beam 2 at first construction section marginal position along longitudinal direction to connect Binder, the middle part and end of the second construction section section steel beam 2 should also weld elongated 8# channel-section steels coupling beam increase resistance to overturning, reduce The Out-of-plane Effective Length of section steel beam 2, and three row's vertical rods of the full hall frame on the second construction section at the end position set up Bottom of upright rod and the 22a I-steel edge of a wing are welded afterwards, in the case of sweep the floor bar and scissors strut, can be considered overall.
, should be with concrete to be onstructed of encorbelmenting outside hotel lobby at the beam stage casing construction joint of agent structure 1 in the present embodiment The beam construction joint of structure does reinforcement processing, and beam both sides separately add the reinforcing bars of 14@of HRB400 diameters 150(Non-anti- sprains), to inner frame Position anchors into 2000mm, outwards encorbelments and anchors into 1500mm, and the beam of the second construction section, should at the construction joint of middle part after the completion of vibrating Vibrate again, prevent leakiness of the section steel beam 2 under deflection deformation at concrete construction joint.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention Scope is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention covers people in the art Member according to present inventive concept it is conceivable that equivalent technologies mean.

Claims (10)

1. a kind of large cantilever concrete structure section construction method, it is characterised in that as follows including step:
Step one:According to the size of encorbelmenting for concrete structure of encorbelmenting, concrete structure to be onstructed of encorbelmenting is divided into the first construction section With the second construction section;Wherein the first construction section is along agent structure(1)Frame edge is outwards encorbelmented 2.5m ~ 3.5m, the second construction section Outwards encorbelmented 3.0m ~ 3.5m along the outward flange of the first construction section;
Step 2:Agent structure below concrete structure to be onstructed of encorbelmenting(1)On, along agent structure(1)Frame edge Scaffold support is laid, one end of scaffold support is fixed on agent structure(1)On, the other end of scaffold support exceeds main body Structure(1)Frame edge, encorbelments in agent structure(1)Side outside, and the size of encorbelmenting of scaffold support encorbelments with to be onstructed The size of encorbelmenting of concrete structure is adapted;
Step 3:Carry out the construction of the first construction section concrete structure to be onstructed of encorbelmenting;It is as follows that specific method includes step:
Step a:Set up the first paragraph beam footing hand cradle of the first construction section concrete structure bottom to be onstructed of encorbelmenting(3)And first paragraph Plate footing hand cradle(4);Wherein first paragraph plate footing hand cradle(4)The plate for being inclined at concrete structure to be onstructed of encorbelmenting is applied with waiting The agent structure that work is encorbelmented below concrete structure(1)Between;First paragraph beam footing hand cradle(3)It is arranged on coagulation to be onstructed of encorbelmenting Between scaffold support below the beam of the beam of soil structure and concrete structure to be onstructed of encorbelmenting;
Step b:Set up the first construction section concrete structure to be onstructed of encorbelmenting template die plate and the first construction section it is to be onstructed encorbelment it is mixed The beam forms of Xtah Crude Clay structure;
Step c:Pour the board concrete and beam concrete of the first construction section concrete structure to be onstructed of encorbelmenting;
Step 4:In concrete structure upper body structure to be onstructed of encorbelmenting(1)Side on pre-buried anchor ring(5);
Step 5:Treat that the first construction section in step c is encorbelmented the board concrete intensity of concrete structure and the intensity of beam concrete When reaching design strength, the agent structure above concrete structure of encorbelmenting(1)Drawn between scaffold support and set suspension cable (6), suspension cable(6)Upper end be fixed on anchor ring(5)On, suspension cable(6)Lower end be connected to the end of scaffold support;
Step 6:In scaffold support and agent structure(1)Frame column(11)Between support member is set(12);By support member (12)Lower end be connected to frame column(11)On, support member(12)Upper end be supported on the bottom of scaffold support;
Step 7:Carry out the construction of the second construction section concrete structure to be onstructed of encorbelmenting;It is as follows that specific method includes step:
Step A:Set up the second segment beam footing hand cradle of the second construction section concrete structure bottom to be onstructed of encorbelmenting(7)And second segment Plate footing hand cradle(8);
The second segment beam footing hand cradle(7)With second segment plate footing hand cradle(8)It is full hall frame;And second segment beam footing hand Frame(7)With first paragraph beam footing hand cradle(3)Connection, second segment plate footing hand cradle(8)With first paragraph plate footing hand cradle(4)Connection;
Step B:Set up the second construction section concrete structure to be onstructed of encorbelmenting template die plate and the second construction section it is to be onstructed encorbelment it is mixed The beam forms of Xtah Crude Clay structure;
Step C:Pour the board concrete and beam concrete of the second construction section concrete structure to be onstructed of encorbelmenting;
Step D:Seam between first construction section and the second construction section beam concrete is handled, while to the first construction section And the second seam between construction section board concrete is handled, so far construction is finished.
2. a kind of large cantilever concrete structure section construction method according to claim 1, it is characterised in that:In step 2 Scaffold support includes along agent structure(1)One group of section steel beam that frame edge parallel interval is set(2), be laid on section steel beam (2)On springboard and enclose and be located at section steel beam(2)The protection network of lower section;The section steel beam(2)Anchoring section by hoop be located at it The U-shaped dowel of top(9)It is fixed on agent structure(1)On, section steel beam(2)Section of encorbelmenting vertically encorbelment in agent structure(1)'s Side is outer;The U-shaped dowel(9)It is provided with one group, along section steel beam(2)Long axis direction parallel interval set, and U-shaped dowel (9)Two free ends be embedded in agent structure(1)Floor in;The section steel beam(2)Bottom is provided with antiskid part(10); The antiskid part(10)It is correspondingly arranged at agent structure(1)The side wall both sides of frame edge, and side wall is stuck in its composition In groove.
3. a kind of large cantilever concrete structure section construction method according to claim 2, it is characterised in that:Step 3 exists Set up first paragraph beam footing hand cradle(3)With first paragraph plate footing hand cradle(4)Before, in section steel beam(2)Top, correspondence first paragraph Beam footing hand cradle(3)Position at transversely parallel interval be connected with first paragraph beam bottom coupling beam(13), the first paragraph beam bottom connects Beam(13)Top, be interval with vertical plug-in unit along its long axis direction;In section steel beam(2)Top, correspondence first paragraph plate footing Hand cradle(4)Position at transversely parallel interval be connected with first paragraph plate bottom coupling beam(14).
4. a kind of large cantilever concrete structure section construction method according to claim 3, it is characterised in that:Described first Section plate footing hand cradle(4)Include bearing diagonal(4.1), the first transverse horizontal bar(4.2), first longitudinal direction horizon bar(4.3)With One scissors strut(4.4);The bearing diagonal(4.1)Bottom be fixed on agent structure(1)In frame edge, bearing diagonal(4.1) Upper end it is outward-dipping, be supported on the bottom of the template die plate of concrete structure to be onstructed of encorbelmenting;The first transverse horizontal bar (4.2)Parallel interval is connected to bearing diagonal(4.1)Between, the first transverse horizontal bar(4.2)With bearing diagonal(4.1)In position of intersecting point Place is connected by cruciform fastening for falsework;The first longitudinal direction horizon bar(4.3)Parallel interval is connected to the first transverse horizontal bar(4.2)With Bearing diagonal(4.1)Intersection point between, first longitudinal direction horizon bar(4.3)With the first transverse horizontal bar(4.2)Lead at position of intersecting point Cross cruciform fastening for falsework connection.
5. a kind of large cantilever concrete structure section construction method according to claim 4, it is characterised in that:The oblique branch Support(4.1)It is made up of steel pipe;The section steel beam(2)Top, correspondence bearing diagonal(4.1)Link position at provided with tilt plug-in unit, The bearing diagonal(4.1)Bottom noose tilt plug-in unit on.
6. a kind of large cantilever concrete structure section construction method according to claim 5, it is characterised in that:In step 3 First paragraph beam footing hand cradle(3)Include the first vertical rod(3.1), the second transverse horizontal bar(3.2), second longitudinal direction horizon bar (3.3)With the second scissors strut(3.4);First vertical rod(3.1)Bottom correspondence noose in first paragraph beam bottom coupling beam(13) Top vertical plug-in unit on.
7. a kind of large cantilever concrete structure section construction method according to claim 5 or 6, it is characterised in that:Step Suspension cable described in rapid five(6)There is one group, with section steel beam(2)Correspondence arrangement, and suspension cable(6)Lower end be connected to section steel beam (2)The end for section of encorbelmenting;Suspension cable is set in drawing(6)Before, section steel beam(2)A section bottom surface of encorbelmenting, be provided with the end position Prevent suspension cable(6)Mobile antiskid part(10).
8. a kind of large cantilever concrete structure section construction method according to claim 7, it is characterised in that:In step 6 The support member(12)It is connected to section steel beam(2)With agent structure(1)Frame column(11)Between;The support member(12)It is upper End is supported on section steel beam(2)Bottom.
9. a kind of large cantilever concrete structure section construction method according to claim 8, it is characterised in that:The step Seven are setting up second segment beam footing hand cradle(7)With second segment plate footing hand cradle(8)Before, in section steel beam(2)Top, correspondence the One section of beam footing hand cradle(3)Position at transversely parallel interval be connected with second segment beam bottom coupling beam(15), the second segment beam Bottom coupling beam(15)Top, be interval with vertical plug-in unit along its long axis direction;In section steel beam(2)Top, correspondence second segment plate Footing hand cradle(8)Position at transversely parallel interval be connected with second segment plate bottom coupling beam(16);The second segment beam footing hand Frame(7)In vertical rod bottom correspondence noose in second segment beam bottom coupling beam(15)On the vertical plug-in unit at top;The second segment plate bottom Scaffold(8)In vertical rod bottom be supported on the section steel beam of the second construction section(2)Top.
10. a kind of large cantilever concrete structure section construction method according to claim 8, it is characterised in that:It is described oblique Drag-line(6)Include oblique pull cable elements, lower suspension cable unit and the flower basket bolt being connected between two skew cables units; The lower end of wherein upper oblique pull cable elements is connected with the pull bar on flower basket bolt top, under the upper end and flower basket bolt of lower suspension cable unit The pull bar connection in portion.
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