CN110805256A - Construction process of flower basket pull rod tool type overhanging scaffold - Google Patents
Construction process of flower basket pull rod tool type overhanging scaffold Download PDFInfo
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- CN110805256A CN110805256A CN201910914220.8A CN201910914220A CN110805256A CN 110805256 A CN110805256 A CN 110805256A CN 201910914220 A CN201910914220 A CN 201910914220A CN 110805256 A CN110805256 A CN 110805256A
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- Prior art keywords
- scaffold
- pull rod
- steel
- rod
- flower basket
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 6
- 238000010408 sweeping Methods 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
- E04G3/18—Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by cantilevers or other provisions mounted in openings in the building, e.g. window openings
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
- E04G3/20—Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by walls
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/04—Means for fastening, supporting, or bracing scaffolds on or against building constructions
- E04G5/046—Means for fastening, supporting, or bracing scaffolds on or against building constructions for fastening scaffoldings on walls
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/16—Struts or stiffening rods, e.g. diagonal rods
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a construction process of a flower basket pull rod tool type overhanging scaffold, which comprises the following steps of firstly, designing a scheme of the overhanging scaffold; step two, carrying out factory processing on the I-steel, the turn-buckle bolts and the steel pull rods; step three, reserving screw holes and installing high-strength bolts in the structural construction; step four, checking and installing I-shaped steel, turn buckle and steel pull rod in the field; and step five, after the structural strength of the cantilever layer concrete reaches C15, erecting the first to third vertical rods. The construction process of the flower basket pull rod tool type overhanging scaffold is convenient to construct, low in construction cost and capable of reducing water seepage of an outer wall.
Description
The technical field is as follows:
the invention relates to the field of buildings, in particular to a construction process of a flower basket pull rod tool type overhanging scaffold.
Background art:
with the development and popularization of high-rise and super high-rise buildings, the cantilever scaffold is more and more widely applied. The traditional cantilever scaffold has some problems in the use process, such as large input of turnover materials (mainly I-shaped steel), water seepage caused by the fact that the I-shaped steel penetrates through a wall, and the like.
The invention content is as follows:
the invention aims to solve the technical problem of providing a flower basket pull rod tool type overhanging scaffold construction process which is convenient to construct, low in construction cost and capable of reducing water seepage of an outer wall.
The technical proposal of the invention is to provide a construction process of a flower basket pull rod tool type overhanging scaffold, which comprises the following steps,
step one, designing a cantilever scaffold scheme;
step two, carrying out factory processing on the I-steel, the turn-buckle bolts and the steel pull rods;
step three, reserving screw holes and installing high-strength bolts in the structural construction;
step four, checking and installing I-shaped steel, turn buckle and steel pull rod in the field;
fifthly, after the structural strength of the cantilever layer concrete reaches C15, erecting first-third vertical rods;
constructing an upper layer structure, reserving screw holes and installing high-strength bolts;
step seven, installing a turn buckle and a pull rod, and connecting the turn buckle with the outer end of the I-shaped steel through the turn buckle;
step eight, erecting a scaffold upwards along with the floor;
and step nine, dismantling the scaffold.
Preferably, in step seven, the scaffold erection procedure is as follows: first step upright rod → longitudinal floor sweeping rod is placed → transverse floor sweeping rod → first step longitudinal horizontal rod → first step transverse horizontal rod → wall connecting member → second step longitudinal horizontal rod → second step transverse horizontal rod … … are lifted step by step in this order, while the lateral side is made with the scissors stay.
Preferably, in the step eight, after the flower basket pull rod tool type overhanging scaffold is used, the scaffold is sequentially dismantled from top to bottom, the I-shaped steel beam is dismantled, the reserved screw holes in the beam are filled and repaired by cement mortar doped with an expanding agent after the high-strength bolts are taken out, and water seepage is prevented.
Compared with the prior art, the invention has the following advantages after adopting the scheme: the scaffold is suitable for the position of a traditional overhanging scaffold, is convenient to construct, has lower construction cost and reduces the water seepage of an outer wall.
The specific implementation mode is as follows:
the invention is further illustrated with respect to specific embodiments below:
example 1
A construction process of a flower basket pull rod tool type overhanging scaffold comprises the following steps,
step one, designing a cantilever scaffold scheme; specifically, familiarity with construction drawings: the building is mainly familiar with the plane and elevation views and the structural plan view. The design of the structure of the building peripheral beam slab, peripheral lines, balconies, holes and the like needs to be known; preliminary design: the device comprises a starting position of the overhanging scaffold, an overhanging height of each time and an overhanging length of I-steel. In consideration of the pursuit of individuality in modern building design, the planes and the vertical surfaces are changed greatly, and difficulty is increased for scaffold arrangement. Therefore, during the primary design of the scheme, processing methods of some special parts, such as external corners, stairs, balconies and the like, are considered, and corresponding reinforcement measures are made for some large overhanging parts through calculation; designing a construction scheme;
and step two, carrying out factory processing on the I-shaped steel, the turn-buckle bolts and the steel pull rods, calculating the length and the number of the section steel according to a scheme and a construction drawing, and ensuring the size of the base of the scaffold. After the processing is finished, the product can be put into use after being qualified by field reinspection;
step three, reserving screw holes in the structural construction, installing high-strength bolts, reserving the high-strength bolt screw holes in the frame beams outside the overhanging layer structure in a pre-buried mode in a 30PVC pipe mode, installing M27-10.9-level high-strength bolts, and arranging the bolts in a plane layout according to a special scheme, wherein each group of two bolts are positioned at the upper part of the beam in the height direction; the screw hole is reserved at the middle upper part of the beam in the height direction and is not reserved at the lower part of the beam, otherwise, the load cannot be effectively transferred; after pre-buried PVC pipes are reserved in the screw holes, quality testing personnel and technical personnel check and accept the pre-buried PVC pipes and then concrete is poured accurately;
step four, checking and installing I-shaped steel, turn buckle and steel pull rod in the field; and after entering the field, the I-shaped steel, the turn buckle and the steel pull rod are subjected to total inspection according to the design size requirement, and can be installed after being qualified through the re-inspection. And after the cantilever layer structure concrete is poured, after the curing strength reaches C15, the I-shaped steel is installed. Installation personnel stand and install on the operation platform of lower floor scaffold frame, avoid unsettled operation and probe operation. The method comprises the following steps that (1) beam side concrete at a contact part of the I-shaped steel is inspected before installation, the beam side concrete needs to be dense, flat and vertical in surface, and when the concrete at the contact part cannot meet installation requirements, concrete repair, polishing and the like are carried out;
fifthly, after the structural strength of the cantilever layer concrete reaches C15, erecting first-third vertical rods; after the I-steel is installed, erecting first-third-step upright rods of an overhanging scaffold, wherein the load must be strictly controlled and the stacking load is strictly forbidden due to the fact that no tie rod exists; when the cantilever scaffold is erected for the first to third steps, because the upper layer structure is not constructed or the strength of concrete does not meet the requirement, the tension of the pull rod is not considered, so that the load of the scaffold body in the above 3 steps is born by the I-shaped steel independently, and the I-shaped steel, the welding seam and the steel plate need to be safely calculated. In order to ensure the construction safety, no stacking load is required in the above 3 steps, and the uniformly distributed live load is 1KN/m2Calculating the axial load of a single vertical rod to be 2.32KN through sample safety software, considering the I-steel according to the cantilever beam of the fixed support, and calculating the maximum bending moment M of the supportmax＝2.32×1.1+2.32×0.25+0.205×1.12/2＝3.26KN·m
And (3) calculating the bending moment of the I-steel: sigma-M/gammaxW＝3.26KN·m/1.05×141cm3＝22.02N/mm2≤[f]＝215N/mm2The requirements are met;
calculating the welding seam bending moment: sigma mf＝M/Wf＝3.26KN·m/141cm3＝23.12N/mm2≤fwf＝160N/mm2The requirements are met;
and (3) calculating the shearing force of the welding seam: tau isv f＝V/Af＝4640N/(2×(0.7×5)mm×140mm)＝4.73N/mm2≤fw f＝160N/mm2The requirements are met;
then calculating the welded steel plate, wherein the steel plate is sheared at the bolt, the outward tension of the bolt is 2.32 multiplied (0.25+1.1)/0.1 which is 31.32KN according to the rotation moment principle, and the outer diameter of the nut is 40mm
τ＝F/(πd×10mm×2)＝31.32KN/(3.14×40mm×10mm×2)＝12.5N/mm2<fv＝125N/mm2The requirements are met; through the calculation, the overhanging scaffold can meet the use requirement, and is safe and reliable;
constructing an upper layer structure, reserving screw holes and installing high-strength bolts; in the step, screw holes are reserved in the same overhanging layer, but two screw holes are reserved in the overhanging layer, and one screw hole is reserved in the upper-layer pulling joint point;
step seven, installing a turn buckle and a pull rod, and connecting the turn buckle with the outer end of the I-shaped steel through the turn buckle;
step eight, erecting a scaffold upwards along with the floor; the scaffold is set up according to a conventional method, and the procedure is as follows: the first step of upright rod → the placement of the longitudinal floor sweeping rod → the transverse floor sweeping rod → the first step of longitudinal horizontal rod → the first step of transverse horizontal rod → the wall connecting member → the second step of longitudinal horizontal rod → the second step of transverse horizontal rod. Wherein the pole setting foundation treatment mode does: and welding 10cm long and diameter 25 short reinforcing steel bar heads at the drop points of the vertical rods on the I-shaped steel so as to fix the position of the scaffold. The construction steps of the content are the same as those of a common scaffold.
And step nine, dismantling the scaffold, after the flower basket pull rod tool type overhanging scaffold is used, dismantling the scaffold from top to bottom in sequence, dismantling the I-shaped steel beam, taking out the high-strength bolt, and filling and repairing the reserved screw hole on the beam by using cement mortar mixed with an expanding agent to prevent water seepage.
The working principle of the cantilever scaffold is that bolt holes are reserved in an outer frame beam of a cantilever layer of the cantilever scaffold, 2M 27-10.9-level high-strength bolts penetrate through the bolt holes, a welding steel plate at one end of an I-steel is connected with the high-strength bolts through screw holes, and therefore the I-steel is installed on the cantilever layer. When the upper-layer structure is constructed, bolt holes are reserved in the outer frame beam in the same way and penetrate through 1M 27-10.9-level high-strength bolt. Two M22 steel pull rods with lug plates welded at one ends are connected through a turn buckle, one ends of the M22 steel pull rods are connected with the high-strength bolt on the upper layer, the other ends of the M22 steel pull rods are connected with the outer end of the I-shaped steel, and both sides of the outer end of the I-shaped steel are welded with steel plates, and the middle of each steel plate is perforated and connected with the lug plates of the pull. Thus, an integral triangular stress frame is formed and used as a vertical rod base of the overhanging scaffold to support the upper system.
The following is the comparison of the material cost of the tool type cantilever frame and the common cantilever frame, which are all considered according to the national standard material market price.
The direct cost of each overhanging steel beam adopting the basket pull rod type can be saved by about 80 yuan, the labor cost of the basket pull rod type overhanging steel beams is not greatly different in the field engineering installation process, and the labor cost of the basket pull rod type overhanging steel beams is still relatively high due to a large amount of welding work in the processing and manufacturing process of the previous material of the pull rod type outrigger, but the basket pull rod type outrigger is disposable after all and can be recycled for multiple times.
Therefore, the construction method has considerable economic benefit, particularly has more remarkable economic value under the condition of slight benefit of the current building construction, and is worthy of popularization.
The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the claims. All the equivalent structures or equivalent process changes made by the description of the invention are included in the scope of the patent protection of the invention.
Claims (3)
1. The utility model provides a flower basket pull rod instrument formula scaffold construction technology that encorbelments, its characterized in that: comprises the following steps of (a) carrying out,
step one, designing a cantilever scaffold scheme;
step two, carrying out factory processing on the I-steel, the turn-buckle bolts and the steel pull rods;
step three, reserving screw holes and installing high-strength bolts in the structural construction;
step four, checking and installing I-shaped steel, turn buckle and steel pull rod in the field;
fifthly, after the structural strength of the cantilever layer concrete reaches C15, erecting first-third vertical rods;
constructing an upper layer structure, reserving screw holes and installing high-strength bolts;
step seven, installing a turn buckle and a pull rod, and connecting the turn buckle with the outer end of the I-shaped steel through the turn buckle;
step eight, erecting a scaffold upwards along with the floor;
and step nine, dismantling the scaffold.
2. The construction process of the flower basket pull rod tool type overhanging scaffold according to claim 1, characterized in that: in the seventh step, the scaffold setting program is as follows: first step upright rod → longitudinal floor sweeping rod is placed → transverse floor sweeping rod → first step longitudinal horizontal rod → first step transverse horizontal rod → wall connecting member → second step longitudinal horizontal rod → second step transverse horizontal rod … … are lifted step by step in this order, while the lateral side is made with the scissors stay.
3. The construction process of the flower basket pull rod tool type overhanging scaffold according to claim 1, characterized in that: and step eight, after the flower basket pull rod tool type overhanging scaffold is used, sequentially removing the scaffold from top to bottom, removing the I-shaped steel beam, taking out the high-strength bolt, and filling and repairing reserved screw holes in the beam by using cement mortar doped with an expanding agent to prevent water seepage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910914220.8A CN110805256A (en) | 2019-09-26 | 2019-09-26 | Construction process of flower basket pull rod tool type overhanging scaffold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910914220.8A CN110805256A (en) | 2019-09-26 | 2019-09-26 | Construction process of flower basket pull rod tool type overhanging scaffold |
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| Publication Number | Publication Date |
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| CN110805256A true CN110805256A (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910914220.8A Pending CN110805256A (en) | 2019-09-26 | 2019-09-26 | Construction process of flower basket pull rod tool type overhanging scaffold |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111851987A (en) * | 2020-08-30 | 2020-10-30 | 陕西建工第一建设集团有限公司 | Construction method of attached short-limb I-steel flower basket pull rod knot type cantilever frame |
-
2019
- 2019-09-26 CN CN201910914220.8A patent/CN110805256A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111851987A (en) * | 2020-08-30 | 2020-10-30 | 陕西建工第一建设集团有限公司 | Construction method of attached short-limb I-steel flower basket pull rod knot type cantilever frame |
| CN111851987B (en) * | 2020-08-30 | 2023-11-03 | 陕西建工第一建设集团有限公司 | Construction method of attached short-limb I-shaped steel basket pull rod pull-knot type cantilever frame |
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| PB01 | Publication | ||
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Application publication date: 20200218 |