CN109577650B - Assembled steel hanger for auxiliary prefabrication of large-scale steel reinforcement framework on construction site and construction method for auxiliary prefabrication of large-scale steel reinforcement framework - Google Patents
Assembled steel hanger for auxiliary prefabrication of large-scale steel reinforcement framework on construction site and construction method for auxiliary prefabrication of large-scale steel reinforcement framework Download PDFInfo
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- CN109577650B CN109577650B CN201811650461.8A CN201811650461A CN109577650B CN 109577650 B CN109577650 B CN 109577650B CN 201811650461 A CN201811650461 A CN 201811650461A CN 109577650 B CN109577650 B CN 109577650B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 244
- 239000010959 steel Substances 0.000 title claims abstract description 244
- 230000002787 reinforcement Effects 0.000 title claims abstract description 119
- 238000010276 construction Methods 0.000 title claims abstract description 51
- 238000009417 prefabrication Methods 0.000 title description 10
- 238000000034 method Methods 0.000 claims description 22
- 238000009434 installation Methods 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 238000003466 welding Methods 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000009194 climbing Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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Abstract
The assembled steel hanger comprises a plurality of single U-shaped door frames and a cross beam, wherein the adjacent single U-shaped door frames are connected into a cuboid framework through a pull rod; the single U-shaped portal frame comprises a base, a vertical rod and an inclined strut; the base comprises a base steel beam, and two ends of the base steel beam are connected with the upright bolts through upright connectors; two ends of the diagonal brace are respectively connected with the vertical rod and the base steel beam; hooks which are parallel to each other are respectively arranged on the two upright posts; the cross beam is placed on two hooks which are parallel to each other and is positioned at the upper part of each single U-shaped portal frame. The assembled steel hanger disclosed by the invention has the advantages that the geometric structure of the hanger is unchanged, the bearing capacity and the stability of the hanger are improved, the self weight and the construction load of a large-sized steel reinforcement framework can be born, and the construction requirement is met.
Description
Technical Field
The invention relates to a hanger in the technical field of building construction, in particular to an assembled steel hanger for assisting in prefabricating a large-scale steel reinforcement framework on a construction site and a construction method for assisting in prefabricating the large-scale steel reinforcement framework.
Background
The existing technology for prefabricating the large-scale steel rib frame is as follows: and a fastener type steel pipe operation frame is erected to assist the manufacture of the large-sized steel rib frame. The construction process comprises the following steps:
1. after the field is leveled, the cross section size of the steel bar framework is correspondingly arranged on the ground according to the width of the steel bar framework: 200 x 50mm wood pad.
2. And erecting a fastener type steel pipe operation frame on the wood base plate. The dead weight of the large-scale steel reinforcement framework is supported by the steel pipe cross rod and the vertical rod of the operation frame.
3. The steel reinforcement framework sheet, the stirrups and the constructional ribs are positioned, installed, bound and adjusted to be formed on the erected fastener type steel pipe operation frame.
4. After the large-sized steel rib frame is manufactured, the frame is lifted by a crane to be separated from the fastener type steel tube operation frame, and after the related rod piece of the fastener type steel tube operation frame is removed, the large-sized steel rib frame is lifted to a preset position.
The actual construction summary shows that the construction process has the following defects:
1. the support force of the fastener type steel pipe prefabricated frame is insufficient:
the steel pipe with phi of 48.3 mm and the corresponding fastener are used as the operation frame of the main supporting piece, and are limited by the rigidity of the steel pipe, the fastening connection of the fastener and the like, so that excessive load is difficult to bear, and the dead weight of the large-sized steel reinforcement framework cannot be supported.
2. Stability is poor:
the key nodes of the fastener type steel pipe operation frame are connected by fasteners, and the steel pipes are connected and fixed together by the holding power and the friction force of the fasteners to play a role together. The friction effect between the fastener and the steel pipe is not well ensured and the stability is poor under the influence of the level of operators and the surface roughness of materials.
3. The dismantling is inconvenient:
the beam steel pipe can be pulled out of the steel reinforcement framework only by dismantling all beam fasteners, so that the hoisting time of the large-scale steel reinforcement framework is prolonged.
4. The manufacturing period of the fastener type steel pipe prefabricated frame is longer:
the rod pieces and the connecting pieces of the fastener type steel pipe prefabricated frame are numerous, and professional shelf workers are required to manufacture and install the fastener type steel pipe prefabricated frame, and the time for erection is long.
Disclosure of Invention
The invention aims to provide an assembled steel hanger for an auxiliary prefabricated large steel reinforcement framework on a construction site and a manufacturing and construction method for the auxiliary prefabricated large steel reinforcement framework, which have higher bearing capacity and stability, form an assembled structure and improve production efficiency; to solve the above problems existing in the prior art.
The technical scheme for solving the problems is as follows: the assembled steel hanger comprises a plurality of single U-shaped door frames and a cross beam, wherein the adjacent single U-shaped door frames are connected into a cuboid framework through a pull rod; the single U-shaped portal frame comprises a base, a vertical rod and an inclined strut; the base comprises a base steel beam, and two ends of the base steel beam are connected with the upright bolts through upright connectors; the two ends of the base steel beam are also provided with lower diagonal bracing connecting pieces, the lower end of the vertical rod is provided with an upper diagonal bracing connecting piece, and the two ends of the diagonal bracing are respectively connected with the upper diagonal bracing connecting piece and the lower diagonal bracing connecting piece through bolts; hooks which are parallel to each other are respectively arranged on the two upright posts; the cross beam is placed on two hooks which are parallel to each other and is positioned at the upper part of each single U-shaped portal frame.
The further technical scheme is as follows: a plurality of hooks are arranged on the vertical rod.
The further technical scheme is as follows: the pull rod comprises a horizontal pull rod and an oblique scissor pull rod.
The further technical scheme is as follows: the hook is a U-shaped hook made of steel bars.
The further technical scheme is as follows: an upper horizontal pull rod, a lower horizontal pull rod and two oblique scissor pull rods which form an X shape are arranged between the adjacent single U-shaped door frames.
Another related technical scheme is as follows: the construction method for prefabricating the large-scale steel reinforcement framework is that the construction method for prefabricating the large-scale steel reinforcement framework in an auxiliary manner is adopted, the large-scale steel reinforcement framework is hung on an assembled steel reinforcement framework, after being positioned and fixed, the arrangement of upper stirrups, lacing wires, prestressed pipelines and the like is configured, and then the construction of binding, mounting and hoisting is carried out, so that the prefabrication of the large-scale steel reinforcement framework is realized; the specific working flow is as follows:
a: and (3) preparation of construction: comprises the steps of designing an assembled steel hanger, site selection and site leveling;
b: mounting a base, a vertical rod and an inclined strut of the assembled steel hanger: sequentially installing a base, a vertical rod and an inclined strut of the assembled steel hanger to form a single U-shaped portal;
b1: processing and manufacturing a base of the assembled steel hanger;
b2, processing and manufacturing an upright rod of the assembled steel hanger;
b3, installing the vertical rod of the assembled steel hanger on the base;
b4: installing diagonal braces on the base to form a single U-shaped portal;
c: pull rod installation of assembled steel hanger: after a plurality of U-shaped door frames are continuously erected, welding and tying the plurality of U-shaped door frames with each other by using a pull rod; the installation sequence is as follows: firstly, installing a middle horizontal pull rod, and then installing an oblique scissor pull rod;
d: installing a steel reinforcement framework sheet and a beam: each U-shaped portal upper portion all sets up a crossbeam, and crossbeam installation time goes on with the installation time of framework of steel reinforcement piece in step, and this installation construction order is: the method comprises the steps of entering a steel reinforcement framework sheet, positioning an automobile crane, lifting the steel reinforcement framework sheet into a U-shaped portal for positioning, penetrating a cross beam, standing the cross beam on a hanger upright rod hook, falling the steel reinforcement framework sheet, standing on the cross beam, and unhooking the automobile crane;
e: manufacturing and forming a reinforcement cage;
f: and hoisting the steel reinforcement framework.
The further technical scheme is as follows: the step F: the skeleton hoisting comprises the following steps:
f1, lifting and hanging two automobile cranes and 4 lifting points together to exert force on the whole crane of the large steel rib frame; two pairs of hanging points are selected on the top surface main ribs, the steel wire ropes are tied on the two main ribs, and the stability of the framework in the hanging process is controlled;
f2: the crane vertically lifts the whole steel reinforcement framework, the lifting height is not more than 100mm, and the steel reinforcement framework is ensured to be completely out of contact with the cross beam;
f3: manually boarding a small-sized operation table to check the movable condition of the cross beam;
f4: the beam is pulled out from one side of the steel reinforcement framework by artificial force; the extracted construction sequence is as follows: one end of the reinforcement cage is pulled out to the other end in sequence;
and F5: continuously vertically lifting the whole reinforcement cage and moving to a working surface;
f6: before the steel bar is lowered, the positions of the steel bars of the vertical bars are compared, and the positions of the steel bars of the vertical bars and the bottom hoops are correspondingly adjusted;
f7: when the reinforcement cage is lowered, the high-side upright rods are calibrated firstly, then the high-side upright rods are calibrated from the high side to the low side, after three upright rods are deep, the protection layer is finely adjusted, and the protection layer is placed after the thickness of the protection layer meets the design requirement;
f8: after the steel reinforcement framework is stably installed, manually climbing to the upper surface of the steel reinforcement framework, and removing the lifting hook;
f9: and (3) removing the assembled hanger according to the sequence of 'first assembling and then disassembling, then assembling and first disassembling', oiling and maintaining, and continuing to use the next project.
The further technical scheme is as follows: in step E: the binding method in the process of manufacturing the steel reinforcement framework adopts a cross buckle binding method.
By adopting the technical scheme, the assembled steel hanger for the auxiliary prefabricated large-scale steel reinforcement framework in the construction site and the construction method for the auxiliary prefabricated large-scale steel reinforcement framework have the following beneficial effects compared with the prior art:
1. the bearing capacity and the stability are improved:
because the whole hanger adopts the cuboid skeleton that shaped steel was made, by base, pole setting, crossbeam, bracing and pull rod constitute, form a detachable, the geometry invariant of equipment through bolted connection, increase the bearing capacity and the stability of hanger, let the hanger can bear large-scale shaped steel framework's dead weight and construction load, satisfy the construction needs. The large-scale steel reinforcement framework formed by the auxiliary binding of the section steel hanger is not easy to deform; the construction quality is better controlled.
2. Forming an assembled structure
The hanger comprises a hanger base, a vertical rod, an inclined strut, a pull rod, a cross beam and other components. The connecting pieces are connected with the bolts, so that rapid assembly and disassembly can be realized. Each component of the hanger is made of profile steel with considerable strength and rigidity. And because the hanger can be split into simple rod pieces, the hanger can be reassembled and formed in different places, so that the pressure and difficulty in material transportation are reduced, the condition of non-ideal traffic conditions is overcome, and the hanger can be used in places with poor environments.
3. Improving production efficiency
Under the existing human resource condition, the installation and dismantling speeds of the prefabricated frame are increased. The movable cross beam is placed on the hanger of the hanger, so that the on-site rapid disassembly function is realized in the process of lifting the large-scale steel reinforcement framework, the large-scale steel reinforcement framework is rapidly separated from the hanger, and the steel reinforcement framework is more beneficial to efficiently carrying out the work of lifting, removing the hanger, positioning and installing. Under the traditional technology, each large-sized steel reinforcement framework needs 28 working days manually, and 1.25 shifts are needed to be matched with machinery; in the construction process of prefabricating large-scale steel reinforcement frameworks by adopting the assembled steel hanger, the labor required by each large-scale steel reinforcement framework is 22.5 working days, and 0.85 working stations are required in cooperation. Compared with the prior art, the technology saves labor by 20% and saves mechanical shifts by 32%; the whole skeleton hoisting construction can be completed within 7 days from the installation of the hanging frame to the installation of the large-sized steel skeleton, and the traditional process can be completed only in 8.5 days, so that the whole construction period is advanced by 1.5 days.
4. The invention relates to a technology for auxiliary prefabrication of a large-scale steel reinforcement framework by an assembled hanger, which comprises the following steps: the large-sized steel bar framework sheet is hung on the hanging frame, and after being in place and fixed, the large-sized steel bar framework sheet is provided with stirrups, lacing wires, prestressed pipelines and the like and then is subjected to binding, mounting and hoisting construction, so that the large-sized steel bar framework prefabricated industry is realized. The application range is wide: for example, a rectangular reinforcement cage can be prefabricated in an auxiliary manner; auxiliary prefabricated ship-shaped steel reinforcement frameworks; and (5) prefabricating special-shaped steel reinforcement frameworks such as L-shaped steel reinforcement frameworks and T-shaped steel reinforcement frameworks in an auxiliary mode.
5. Wide application range
According to the specification and the weight of the reinforcement cage to be prefabricated, the hanger materials with different specifications and hanger sizes can be selected through stress checking calculation. The engineering of the application includes: (1) Manufacturing, binding and installing a large-scale reinforcement cage;
(2) Manufacturing engineering of the assembled operation frame;
(3) Manufacturing a reinforcement cage and a reinforcement cage on site;
(4) The poor site conditions can not realize the engineering of prefabricating the large-scale reinforcement cage outside the site;
(5) And an operation platform made of I-steel and other section steel.
The technical characteristics of the assembled steel hanger for the auxiliary prefabrication of the large-scale steel reinforcement framework on the construction site and the construction method for the auxiliary prefabrication of the large-scale steel reinforcement framework are further described below with reference to the accompanying drawings and the embodiment.
Drawings
FIG. 1 is a front view of an assembled steel hanger structure for assisting in prefabricating a large-scale steel reinforcement cage at a construction site in accordance with the present invention;
FIG. 2 is a side view of an assembled steel hanger structure for assisting in prefabricating a large-scale steel reinforcement cage at a construction site in accordance with the present invention;
fig. 3-1 to 12-5 are step diagrams of a construction method for assisting in prefabricating a large-sized reinforcing cage:
FIG. 3-1 is a schematic view of a base of a fabricated hanger; FIG. 3-2 is a schematic view of a hanger pole; fig. 3-3 is a side view of fig. 3-2.
FIG. 4-1 is a schematic view of a mounting hanger pole; fig. 4-2 is a side view of fig. 4-1.
Fig. 5 is a schematic view of the installation of a diagonal brace (also a schematic view of a single U-shaped portal).
FIG. 6-1 is a schematic view (plan) of a second U-shaped portal erected; fig. 6-2 is a schematic view (side view) of a second U-shaped portal erected.
FIG. 7-1 is a schematic view (front side) of a mounting tie rod; FIG. 7-2 is a schematic view (plan) of a mounting tie rod; fig. 7-3 are schematic views (side) of the mounting tie rod.
FIG. 8-1 is a schematic view (plan) of a third U-shaped portal; fig. 8-2 is a schematic view (side view) of a third U-shaped portal erected.
FIG. 9-1 is a schematic view (plan) of three U-shaped portal erection ties; and 9-2 is a schematic drawing (side surface) of a three-truss U-shaped portal frame vertical pull rod.
FIG. 10-1 is a schematic view (plan) of an erected multi-truss U-shaped portal; fig. 10-2 is a schematic view (side view) of a plurality of U-shaped frames.
Fig. 11 is a schematic view (plane) of a plurality of U-shaped portal mounting beams.
FIG. 12-1 is a schematic view of the principle of use of the hanger of the present invention (with the reinforcement cage sheet in place); 12-2 is a schematic diagram of the use principle of the hanger (penetrating into a cross beam); fig. 12-3 are schematic diagrams of the use principle of the hanger of the present invention (binding the remaining reinforcing bars); fig. 12-4 are schematic diagrams of the use principle of the hanger of the present invention (the formed reinforcement cage is lifted off the hanger beam); fig. 12-5 are schematic views of the principle of use of the hanger of the present invention (drawing out the cross beam).
In the figure:
1-base, 11-base steel beams, 12-lower diagonal bracing connectors, 13-upright rod connectors and 14-bolts;
2-vertical rods and 21-upper diagonal bracing connectors;
3-diagonal bracing; 4-pull rod, 41-horizontal pull rod and 42-oblique scissor pull rod;
5-hooking; 6, a cross beam; 7-single U-shaped portal frames; 8-assembling type steel hanger; 9-a steel reinforcement framework sheet; 10-a steel reinforcement framework.
Detailed Description
The definition of the hanger is as follows: the operation frame for assisting the large-sized steel rib frame is made into a door-type frame, and the steel rib frame is hung on the operation frame for installation and binding molding, so the operation frame is named as: and (5) hanging a rack.
As shown in fig. 1 and 2, an assembled steel hanger 8 for auxiliary prefabrication of a large-scale steel reinforcement framework on a construction site is a cuboid framework made of steel, and is composed of a base 1, a vertical rod 2, a cross beam 6, a diagonal brace 3 and a pull rod 4, and is connected through bolts to form a detachable and assembled geometric structure invariant. Then hanging the steel reinforcement framework on the section steel hanger, and carrying out working procedures such as positioning, binding and mounting, thereby realizing the purpose of prefabricating the steel reinforcement framework.
The concrete structure of the assembled steel hanger 8 is as follows: the assembled steel hanger 8 comprises a plurality of single U-shaped door frames 7 and a cross beam 6, and the adjacent single U-shaped door frames 7 are connected into a cuboid framework through a pull rod 4; the single U-shaped portal frame 7 comprises a base 1, a vertical rod 2 and an inclined strut 3; the base 1 comprises a base steel beam 11, and two ends of the base steel beam 11 are connected with the upright 2 through upright connecting pieces 13 by bolts; the two ends of the base steel beam 11 are also provided with lower diagonal bracing connecting pieces 12, the lower end of the vertical rod 2 is provided with an upper diagonal bracing connecting piece 21, and the two ends of the diagonal bracing 3 are respectively connected with the upper diagonal bracing connecting piece 21 and the lower diagonal bracing connecting piece 12 through bolts; hooks 5 which are parallel to each other are respectively arranged on the two upright posts 2; the cross beam 6 is placed on two hooks 5 which are parallel to each other and positioned at the upper part of each single U-shaped portal frame 7.
The upright posts are provided with a plurality of hooks 5, so that the height of the cross beam from the ground can be conveniently adjusted to meet the requirements of steel reinforcement frameworks of different specifications and models. The U-shaped hook made of steel bars is adopted for the hook 5 to connect the cross beam and the upright rod, and the load is transferred to the lower structure. The cross beam is directly placed on the hook, so that the flexible mounting and dismounting functions of the cross beam can be realized.
The pull rod 4 comprises a horizontal pull rod 41 and an oblique scissor pull rod 42. An upper horizontal pull rod 41 and a lower horizontal pull rod 41 and two oblique scissor pull rods 42 which form an X shape are arranged between the adjacent single U-shaped door frames 7.
According to the prefabricated steel skeleton, the assembled steel skeleton can be subjected to stress checking calculation according to the specification and the weight of the steel skeleton to be prefabricated, and hanger materials with different specifications and hanger sizes can be selected. The maximum span control, the longest assembling balance length, the specific technical parameters such as each component of the single U-shaped portal, the connecting piece and the like, and the specification and the size can be set by checking calculation according to the physical design of the steel reinforcement framework.
For example, specific parameters are as follows: the vertical rods are transversely spaced by 3 meters and longitudinally spaced by 4 meters; the beam is 2.5 m from the ground and the pull rod is 1.5m from the ground. The large-scale reinforcement cage with the weight of 3.5 tons, the length of 24 meters, the width of 2.1 meters and the height of 1.5 meters can be prefabricated in an auxiliary mode.
The specifications of the components are as follows: the base adopts 25a I-steel, the upright rod adopts 25a I-steel, the cross beam adopts 25a I-steel, the hook adopts screw steel with the diameter more than 22, and the diagonal bracing adopts 10a channel steel. The base is connected with the vertical rod, the diagonal bracing is connected with the vertical rod and the diagonal bracing is connected with the base through M18 bolts.
The invention relates to a construction method for prefabricating a large-scale steel skeleton, in particular to a construction method for prefabricating the large-scale steel skeleton in an auxiliary manner by an assembled steel hanger for assisting in prefabricating the large-scale steel skeleton, which is characterized in that large-scale steel skeleton sheets are hung on the assembled steel hanger, are arranged in position and fixed, are provided with upper stirrups, lacing wires, prestressed pipelines and the like, and are then subjected to binding, mounting and hoisting construction, so that the prefabrication of the large-scale steel skeleton is realized; the working flow is as follows: A. construction preparation, B, mounting of a hanger base, a vertical rod and a diagonal brace, C, mounting of a hanger pull rod, D, mounting of a steel reinforcement framework sheet, E, manufacturing and forming of a steel reinforcement framework, F and hoisting of the steel reinforcement framework.
The operation key points are as follows:
a: and (3) preparation of construction: comprises the steps of designing an assembled steel hanger, site selection and site leveling;
a1: designing an assembled steel hanger:
(1) And obtaining the plane size and the load parameter of the framework according to the dead weight and the geometric size of the large-scale steel reinforcement framework.
(2) According to the functions and site conditions of the hanging frame, the material, the component specification parameters and the structural arrangement of the hanging frame are set. Through strict structural stress calculation, an operation frame structure system with stable structure, feasible installation and perfect function is formed.
(3) And a safety protection device, an operation platform, a positioning mark and the like are additionally arranged in the outer space of the hanging frame.
A2: site selection and site leveling:
(1) The method comprises the steps of selecting the ground with higher site elevation, smooth drainage, flat topography and smooth water circuit as a hanger installation area.
(2) The place of the hanging frame needs to be arranged in the range of the operable radius of the automobile crane. The working radius of the steel bar framework needs to be set by referring to the dead weight of the steel bar framework, and the steel bar framework can be covered on a working surface.
(3) Mechanically leveling the field and making a field hardening and drainage system.
B: mounting a base, a vertical rod and an inclined strut of the assembled steel hanger: sequentially installing a base, a vertical rod and an inclined strut of the assembled steel hanger to form a single U-shaped portal;
b1: processing and manufacturing a base of the assembled steel hanger: the base steel beam is directly placed on the ground, fully contacts with the ground, is stably and firmly installed, and the vertical rod connecting piece 13 and the lower diagonal bracing connecting piece 12 are welded on the base steel beam 11, see fig. 3-1. The base and the base are arranged in parallel, and the distance between the base and the base is balanced.
B2, processing and manufacturing the vertical rod of the assembled steel hanger: the hooks 5 and the upper diagonal bracing connectors 21 are welded to the uprights, see fig. 3-2; multiple hooks can be arranged on the vertical rod, so that the height of the cross beam from the ground can be conveniently adjusted to meet the requirements of steel bar frameworks of different specifications and models. The hook is a U-shaped connecting piece manufactured by adopting phi 25 deformed steel bars. The blanking length is about 900mm, one end of the U shape is longer than 450mm and welded with the vertical rod (the single-sided welding length is longer than 10 d), the other end is not longer than 250mm, and the length of the horizontal section is about 200mm. The couple mounted position is located the upper portion of pole setting, and concrete position is decided by the height of framework of steel, guarantees that the framework of steel hangs when operating on the crossbeam, and the clearance of framework of steel bottom and stores pylon base is greater than 150mm. The hook is welded and fixed with the vertical rod, and the length of a welding line of single-sided lap welding is not less than 400mm.
B3, mounting the vertical rod of the assembled steel hanger on the base: the upright posts are connected with the base by hexagonal bolts, see fig. 4-1 and fig. 4-2.
B4: installing diagonal braces to form a single U-shaped portal frame on the base: placing the base laterally, tightly attaching the upright rod and the base on the ground, butting and positioning, and putting on bolts for fixation; and a diagonal bracing member is arranged between the upright rod and the base and is fixed by threading a bolt, so that an assembled single U-shaped portal frame is formed, and the assembled single U-shaped portal frame is shown in fig. 5. The single U-shaped portal of the hanging rack lying on the ground is erected manually, and is temporarily supported and fixed by using the section steel.
C: pull rod installation of assembled steel hanger: after a plurality of U-shaped door frames are continuously erected, welding and tying the plurality of U-shaped door frames with each other by using a pull rod; the installation sequence is as follows: firstly, installing a middle horizontal pull rod, and then installing an oblique scissor pull rod; see fig. 6-1 to 11.
D: reinforcement cage sheet 9, beam mounting (see FIGS. 12-1 and 12-2):
d1: and welding and forming the steel reinforcement framework sheet in a steel reinforcement processing area, and transporting to the site after marking.
And D2, the upper part of each upright rod is provided with a hook made of deformed steel bars. The size of the hook is matched with the dead weight of the cross beam and the steel reinforcement framework.
And D3, arranging a cross beam on the upper part of each U-shaped portal frame, wherein the mounting time of the cross beam is synchronous with the mounting time of the steel reinforcement framework sheet.
And D4, installing and constructing the steel reinforcement framework sheet and the cross beam in the following sequence: the method comprises the steps of entering a steel reinforcement framework sheet, positioning an automobile crane, lifting the steel reinforcement framework sheet into a U-shaped portal for positioning, penetrating a cross beam, standing the cross beam on a hanger upright rod hook, falling the steel reinforcement framework sheet, standing on the cross beam, and unhooking the automobile crane.
E: the reinforcement cage 10 is manufactured and molded (see fig. 12-3):
e1: the steel reinforcement framework sheets are accurately distributed according to the positions of the design drawings.
E2: and processing the rest steel bars in a steel bar processing shed according to each numbered steel bar on the design drawing, and then transporting each numbered semi-product steel bar to a framework sheet of the hanger for installation.
E3: and marking out the positions of stirrups on the steel reinforcement framework sheets by using chalks according to design requirements, and binding the stirrups one by one.
E4: when the steel bars are bound, the stirrups are perpendicular to the stressed steel bars, and the directions of the stressed steel bars at the joint positions of the stirrups are staggered.
E5: the method for binding the reinforcement cage is preferably a cross buckle binding method, and a sequential buckle is not required to be adopted, so that the reinforcement is prevented from deforming.
E6: and after the binding of the reinforcing steel bars is finished, a protective layer cushion block is padded on the outer sides of the bottom and the reinforcing steel bars so as to ensure the thickness of the concrete protective layer and no exposed reinforcing steel bars.
F: the reinforcement cage 10 is hoisted (see fig. 12-4).
F1: the whole crane of the large-scale steel rib frame is installed by adopting two automobile cranes to lift and hang, and 4 lifting points exert force together. Two pairs of hanging points are selected on the top surface main ribs, the steel wire ropes are tied on the two main ribs, and the stability of the framework in the hanging process is controlled.
F2: the crane vertically lifts the whole steel reinforcement framework, the lifting height is not more than 100mm, and the steel reinforcement framework is ensured to be completely out of contact with the cross beam.
F3: the small-sized operation table is manually stepped on to check the movable condition of the cross beam.
F4: the resultant force withdraws the beam from one side of the cage (see fig. 12-5). The extracted construction sequence is as follows: one end of the steel reinforcement framework is drawn out to the other end in sequence.
And F5: and continuously vertically lifting the whole reinforcement cage and moving to the working surface.
F6: before the steel bar is lowered, the positions of the steel bars of the vertical bars are compared, and the positions of the steel bars of the vertical bars and the bottom hoops are correspondingly adjusted.
F7: when the reinforcement cage is lowered, the high-side upright rods are calibrated firstly, then the high-side upright rods are calibrated from the high side to the low side, after three upright rods are deep, the protection layer is finely adjusted, and the protection layer is placed after the thickness of the protection layer meets the design requirement.
F8: after the steel reinforcement framework is stably installed, the steel reinforcement framework is manually climbed to the upper surface of the steel reinforcement framework, and the lifting hook is disengaged.
F9: and (3) removing the assembled hanger according to the sequence of 'first assembling and then disassembling, then assembling and first disassembling', oiling and maintaining, and continuing to use the next project.
The assembled steel hanger of the invention is preassembled when the pull rod is installed, and the assembled steel hanger is welded after all parts are preassembled and inspected to be qualified. During welding, the welding sequence should be noted, and generally, the middle node should be welded first, and then the welding sequence should be extended to the nodes at two ends of the hanger, so as to avoid the dimensional error between the nodes caused by the accumulation of the shrinkage of the welding seam to one end. The root gap of the weld joint break is more than 1.5mm larger than the standard value, and the size of the welding leg is increased according to the exceeding gap value. But when the gap is larger than 5mm, the bead welding and polishing methods are used in advance to repair the end head or weld the bead at the joint so as to reduce the gap of the weld.
The stress principle of the assembled steel hanger disclosed by the invention is as follows: the steel reinforcement framework auxiliary hanging frame is constructed to support the large-scale steel reinforcement framework and bear working loads such as binding and installation of the large-scale steel reinforcement framework by utilizing the strength and rigidity of the steel section. The dead weight of the large-sized steel reinforcement framework is transferred to the upright rod through the cross beam; the steel is transmitted to the profile steel base through the vertical rod; the base is contacted with the ground, and finally the load is transferred to the ground. The two outer sides of the vertical rod are provided with a transverse diagonal bracing and a longitudinal pull rod, so that the longitudinal and transverse deformation of the hanging frame is resisted, and the stability and the integrity of the hanging frame are improved.
Claims (3)
1. A construction method for prefabricating a large-scale steel reinforcement framework is characterized by comprising the following steps of: the construction method comprises the steps of hanging large-scale steel rib frame sheets on the assembled steel rib frame in a hanging manner, positioning and fixing the large-scale steel rib frame sheets, configuring stirrups, lacing wires and prestress pipeline settings, and then carrying out construction of binding, mounting and hoisting, so that the large-scale steel rib frame prefabricated work is realized;
the assembled steel hanger (8) comprises a plurality of single U-shaped door frames (7) and cross beams (6), and the adjacent single U-shaped door frames (7) are connected into a cuboid framework through pull rods (4); the single U-shaped portal frame (7) comprises a base (1), a vertical rod (2) and an inclined strut (3); the base (1) comprises a base steel beam (11), and two ends of the base steel beam (11) are connected with the upright (2) through upright connecting pieces (13) through bolts; the two ends of the base steel beam (11) are also provided with lower inclined strut connecting pieces (12), the lower end of the vertical rod (2) is provided with an upper inclined strut connecting piece (21), and the two ends of the inclined strut (3) are respectively connected with the upper inclined strut connecting piece (21) and the lower inclined strut connecting piece (12) through bolts; hooks (5) which are parallel to each other are respectively arranged on the two upright rods (2); the cross beam (6) is placed on two hooks (5) which are parallel to each other and positioned at the upper part of each single U-shaped portal frame (7); the pull rod (4) comprises a horizontal pull rod (41) and an oblique scissor pull rod (42); an upper horizontal pull rod (41) and a lower horizontal pull rod and two oblique scissor pull rods (42) which form an X shape are arranged between the adjacent single U-shaped door frames (7);
the specific working flow of the construction method is as follows:
a: and (3) preparation of construction: comprises the steps of designing an assembled steel hanger, site selection and site leveling;
b: mounting a base, a vertical rod and an inclined strut of the assembled steel hanger: sequentially installing a base, a vertical rod and an inclined strut of the assembled steel hanger to form a single U-shaped portal;
b1: processing and manufacturing a base of the assembled steel hanger;
b2, processing and manufacturing an upright rod of the assembled steel hanger;
b3, installing the vertical rod of the assembled steel hanger on the base;
b4: installing diagonal braces on the base to form a single U-shaped portal;
c: pull rod installation of assembled steel hanger: after a plurality of U-shaped door frames are continuously erected, welding and tying the plurality of U-shaped door frames with each other by using a pull rod; the installation sequence is as follows: firstly, installing a middle horizontal pull rod, and then installing an oblique scissor pull rod;
d: installing a steel reinforcement framework sheet and a beam: each U-shaped portal upper portion all sets up a crossbeam, and crossbeam installation time goes on with the installation time of framework of steel reinforcement piece in step, and this installation construction order is: the method comprises the steps of entering a steel reinforcement framework sheet, positioning an automobile crane, lifting the steel reinforcement framework sheet into a U-shaped portal for positioning, penetrating a cross beam, standing the cross beam on a hanger upright rod hook, falling the steel reinforcement framework sheet, standing on the cross beam, and unhooking the automobile crane;
e: manufacturing and forming a reinforcement cage;
f: and hoisting the steel reinforcement framework.
2. The construction method of the prefabricated large-scale steel reinforcement framework according to claim 1, wherein the construction method comprises the following steps: the step F: the skeleton hoisting comprises the following steps:
f1, lifting and hanging two automobile cranes and 4 lifting points together to exert force on the whole crane of the large steel rib frame; two pairs of hanging points are selected on the top surface main ribs, the steel wire ropes are tied on the two main ribs, and the stability of the framework in the hanging process is controlled;
f2: the crane vertically lifts the whole steel reinforcement framework, the lifting height is not more than 100mm, and the steel reinforcement framework is ensured to be completely out of contact with the cross beam;
f3: manually boarding a small-sized operation table to check the movable condition of the cross beam;
f4: the beam is pulled out from one side of the steel reinforcement framework by artificial force; the extracted construction sequence is as follows: one end of the reinforcement cage is pulled out to the other end in sequence;
and F5: continuously vertically lifting the whole reinforcement cage and moving to a working surface;
f6: before the steel bar is lowered, the positions of the steel bars of the vertical bars are compared, and the positions of the steel bars of the vertical bars and the bottom hoops are correspondingly adjusted;
f7: when the reinforcement cage is lowered, the high-side upright rods are calibrated firstly, then the high-side upright rods are calibrated from the high side to the low side, after three upright rods are deep, the protection layer is finely adjusted, and the protection layer is placed after the thickness of the protection layer meets the design requirement;
f8: after the steel reinforcement framework is stably installed, manually climbing to the upper surface of the steel reinforcement framework, and removing the lifting hook;
f9: and (3) removing the assembled hanger according to the sequence of 'first assembling and then disassembling, then assembling and first disassembling', oiling and maintaining, and continuing to use the next project.
3. The construction method of the prefabricated large-scale steel reinforcement framework according to claim 1, wherein the construction method comprises the following steps: in step E: the binding method in the process of manufacturing the steel reinforcement framework adopts a cross buckle binding method.
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| CN201811650461.8A CN109577650B (en) | 2018-12-31 | 2018-12-31 | Assembled steel hanger for auxiliary prefabrication of large-scale steel reinforcement framework on construction site and construction method for auxiliary prefabrication of large-scale steel reinforcement framework |
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| CN112195801A (en) * | 2020-10-29 | 2021-01-08 | 中交路桥建设有限公司 | Variable-cross-section hollow thin-wall pier steel reinforcement framework in shape of Chinese character 'ri' and integral installation method |
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| GB629355A (en) * | 1947-03-28 | 1949-09-19 | Fordham Pryke | Improvements in or relating to the underpinning of buildings |
| CN101435276A (en) * | 2008-12-18 | 2009-05-20 | 中建二局第三建筑工程有限公司 | Hydraulic lifting and positioning device for steel beam at top of silo structure and construction method thereof |
| CN205296558U (en) * | 2015-11-30 | 2016-06-08 | 中国建筑股份有限公司 | Large -scale prefabricated externally -hanging wallboard of lightweight aggregate micropore concrete |
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