CN113266148A - Installation method of large-section beam template - Google Patents

Installation method of large-section beam template Download PDF

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Publication number
CN113266148A
CN113266148A CN202110600337.6A CN202110600337A CN113266148A CN 113266148 A CN113266148 A CN 113266148A CN 202110600337 A CN202110600337 A CN 202110600337A CN 113266148 A CN113266148 A CN 113266148A
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China
Prior art keywords
template
column
laid
floor
elevation
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陈敏
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Nantong University
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Nantong University
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Priority to CN202110600337.6A priority Critical patent/CN113266148A/en
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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
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, 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
    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, 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
    • E04G11/48—Supporting structures for shutterings or frames for floors or roofs
    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, 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
    • E04G11/48—Supporting structures for shutterings or frames for floors or roofs
    • E04G11/483—Supporting heads

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)

Abstract

The invention discloses a method for installing a large-section beam template, which comprises the following steps of: measuring, erecting a steel pipe support frame, installing a beam template, laying a floor slab template and supporting the lower part of a large-section beam. After the girder beam slab concrete pouring of the invention is finished, the upper frame structure is still constructed, therefore, the girder beam slab concrete strength must reach 100% of the design strength standard value, and the concrete member is required to be dismantled after reaching 28 days of age.

Description

Installation method of large-section beam template
Technical Field
The invention belongs to the field of building construction, and particularly relates to a method for installing a large-section beam formwork.
Background
In normal building construction, a larger section is adopted at a position with larger bending moment, and a smaller section is adopted at a position with smaller bending moment. Such a beam with a cross section varying along the axis is called a variable cross section beam. In the construction process, the inner side formworks of two close-distance large-section beams cannot be effectively reinforced, and the extruded polystyrene board is generally filled between the adjacent beams in the traditional method, so that the reinforcement is very difficult when the templates are removed.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the defects of the prior art, the invention provides a method for installing a large-section beam formwork.
The technical scheme is as follows: a method for installing a large-section beam formwork comprises the following steps: measuring, erecting a steel pipe support frame, installing a beam template, laying a floor slab template and supporting the lower part of a large-section beam; the specific operation is as follows:
the steel pipe support frame is erected as follows:
according to a beam plate layout drawing and a column positioning drawing, a support frame is erected, when an upright column is supported, firstly, a batten is padded at the bottom of a steel pipe, then a middle horizontal pull rod is erected, then a sweeping rod is erected, the sweeping rod is 200mm high away from the ground, so that the upright column is aligned in the longitudinal and transverse directions, meanwhile, the intervals of the upright column are uniform, the upright column is lengthened, except for the top step of a top layer, the top step can be lapped, and other joints of each step need to be connected by adopting butt fasteners;
the butt joint and the lap joint meet the following regulations: the butt fasteners on the vertical rods should be arranged in a staggered manner: joints of two adjacent vertical rods are not required to be arranged in synchronization, and the staggered distance of two spaced joints separating one vertical rod in the height direction is not required to be less than 500 mm; 1/3, the distance from the center of each joint to the main node is not more than the step distance; the lap length is not less than 1m, the lap length is fixed by not less than 2 rotary fasteners, and the distance from the edge of the end fastener cover plate to the rod end is not less than 100 mm;
four sides of the template bracket and the middle of the template bracket are provided with a longitudinal and transverse cross brace every four rows of vertical rods, phi 48 multiplied by 3.Omm steel pipes are selected, and the vertical rods for supporting the main beam are provided with the cross braces with the spacing not more than 5 meters so as to ensure the integral stability; the longitudinal and transverse shear braces are continuously arranged from bottom to top, have an inclination angle of 45 degrees with the ground, are firmly connected with the upright posts, and are not more than 150mm away from the column edge of the first row of upright posts at the beam end;
the beam formwork is installed as follows: the space between the square timbers at the bottom of the beam is not more than 200mm, the beam bottom die is laid immediately after the square timbers are laid orderly, the beam bottom die is arranged from two ends to the middle when in installation, a stay wire is straight, the beam bottom die is butted with a column head first when in laying and is nailed, the side die is sealed in time after the bottom die is laid, the longitudinal space between the beam side die and the column head is 250mm, the square timbers with the size of 45 multiplied by 90mm are used for erecting a stop, and when the beam span is more than 4 meters, the arching height is 1/1000 of the span;
the floor slab template is laid as follows: measuring the height of the index → paving the square timber → paving the template → checking and accepting; popping up a portal frame elevation control line on an upright column, erecting a portal frame, nailing horizontal large corrugated wood on two sides of a beam according to elevation, directly paving square wood on the portal frame, and checking by using a pull wire until the square wood is level; 2. when the span of the plate is more than 4m, the arching height of the plate is the same as that of the adjacent beam; when the floor template is laid, only the joints and the warping parts are nailed firmly, the middle part is not nailed so as to be convenient for removing the template, the joints and the warping parts are nailed firmly by iron nails with the length of 40mm, if the width of the floor slab does not meet the template modulus, the floor slab is laid from the periphery to the middle part when the floor slab is laid, the middle patch plate is closed, and the slab seams are well stained by adhesive tape paper; 3. checking the elevation and the flatness of the board surface, and cleaning the board surface;
the lower part of the large-section beam is supported as follows: the large-section beam is supported on the surface of the lower beam plate, and the support frame body needs more steel pipes and battens, so that the bearing capacity is larger; in order to strengthen the supporting force of the floor, the lower first layer of formwork support needs to be disassembled when the concrete strength of the large-section beam reaches 100%, and the lower second layer of formwork support needs to be disassembled when the concrete strength of the large-section beam reaches 50% or above.
As an optimization: the measurements are as follows:
a. paying off the floor: after the newly poured concrete of the floor slab is hardened, a measurer puts in cross control lines according to the positioning piles, and then measures and releases the control lines of each eccentric axis 200 through the cross control lines; the woodworker and the quality inspector check the control line, and after checking the control line accurately, the woodworker draws the side line of the beam, the wall and the column out according to the design drawing and the design change data to control the side line of the template;
b. and (3) elevation guiding and measuring: according to the control level point, a level gauge is used for guiding and measuring the elevation of the plate surface plus 1m of the control point, the control point is marked on a fixed outer frame, and then a steel ruler or a horizontal pipe is used for guiding and measuring the elevation of the beam bottom and the plate bottom according to the point; and (4) checking the accuracy of the beam column template before the floor template is laid and is not fixed with the beam column template by matching a level gauge and a steel tape.
Has the advantages that: after the girder beam slab concrete pouring of the invention is finished, the upper frame structure is still constructed, therefore, the girder beam slab concrete strength must reach 100% of the design strength standard value, and the concrete member is required to be dismantled after reaching 28 days of age.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Examples
The embodiment is a super high-rise civil building integrating office and commercial hotels, 36 floors are arranged on the ground, and a refuge layer and a roof helicopter parking apron are arranged according to the standard requirements. Skirt house part: the side skirt room in southwest is 3 layers, and the basement totally has 2 layers, and is used as a garage and a room for equipment. The total building area of the present embodiment is 47175m2Wherein: aboveground 44554m2Underground 2620m2The height difference between indoor and outdoor is 0.30m, the building height is 148m, the height of refuge storey is 4.2 m, the height of standard storey is 3.8m, and the heights of one-three storeys of the undaria are 5m, 5m and 4.0m respectively. The structure type is as follows: the frame core tube structure is characterized in that refuge layers are designed on 12 th and 24 th floors of a building, and a helicopter apron is arranged on a roof. According to construction drawings, the large-section beam is mainly arranged in 33, 35 and 36 conversion layers, and the section size is as follows: 600 × 850-950 × 1200 are different, the floor height of the three floors is 3.8 meters, and the thickness of the floor slabs is 120 and 150. Concrete strength grades C35, C40. And (4) according to the actual situation, supporting the steel pipes to be erected on the three layers of girders.
General setup of the support system of the large section beam formwork: (1) the templates are made of 1800mm multiplied by 900mm multiplied by 14mm (thick) plywood, and the cage bones are 45mm multiplied by 90 mm; (2) a support system: selecting phi 48X 3.0mm steel pipe; (3) longitudinal and transverse horizontal pull rods: selecting phi 48 multiplied by 3, Omm steel tube with the maximum vertical spacing not exceeding 1.0 mm; the free height of the top end of the vertical rod is not more than 200mm, and a sweeping cross rod is arranged at a position 200mm away from the ground; (4) longitudinally and transversely bracing: the four sides of the bracket, the two sides of the bottom of the main beam and the middle of the main beam are provided with a longitudinal cross brace at intervals of 4 vertical rods, the cross braces are continuously arranged from bottom to top, the span of the cross braces is not less than 3 spans and not less than 6m, and one cross brace is longitudinally arranged at each 15 m. All steel pipe connections are connected by matching fasteners.
In the embodiment, all the templates are 14-thick multi-layer templates, beam bottom and beam side keels are 45-90 battens, the distance between the beam bottoms is not more than 200, and the distance between the beam sides is not more than 250. The support is made of steel pipes with the diameter phi of 48mm and the wall thickness of 3.0mm, the vertical rod steel pipes are longitudinally @450mm and 900mm, the step pitch of the vertical rods is 1.4-1.5m, the number of the beam bottom bearing vertical rods is 1-2, and the bottom of each steel pipe is additionally provided with a batten seat. The beam side panel is provided with 1-2 rows of phi 12 split bolts, and the horizontal spacing of the split bolts is 450.
The related materials of this embodiment are prepared as follows:
(1) preparing materials: the main materials of the invention include 48X 3.0mm steel pipe, 45X 90X 2500 flitch, phi 12 split bolt, 1.8X 0.9X 0.014 template and fastener. Ensuring that the material quality is qualified and the goods source is sufficient, entering the field according to the material entering plan in batches in stages, storing the materials according to the specified place and well covering and protecting the materials.
The surface of the steel pipe is flat and smooth and has no cracks, scars, layering, dislocation, hard bending, burrs, indentations and deep scribes; the deviation of the outer diameter, the wall thickness, the end face and the like of the steel pipe is in accordance with the regulation of the specification; the steel pipe must be coated with a stainless-resistant paint; the new fastener should have a production license, a test report of a legal detection unit and a product quality qualification certificate; before the old fastener is used, quality inspection is carried out, the old fastener is strictly forbidden to be used due to cracks and deformation, and the large bolt with the slippery threads must be replaced; the new and old fasteners should be treated with rust-proofing treatment.
(2) Preparing a machine tool: according to the quantity plan of the construction equipment, the renting and purchasing plan of the machinery is made, and the inspection and maintenance work before the construction equipment enters the field for use is made, so that the normal operation is ensured. The main construction machines of the project are MJ104 woodworking circular saw, electric drill and the like, and the machine should be maintained before construction.
(3) Preparing a turnover material: and (4) preparing materials of turnover materials such as templates, steel pipe supports and the like, and timely entering the field.
The invention discloses a method for installing a large-section beam template, which comprises the following steps of: measuring, erecting a steel pipe support frame, installing a beam template, laying a floor slab template and supporting the lower part of a large-section beam; the specific operation is as follows:
1. the measurements are as follows:
1, paying off on the floor: after the newly poured concrete of the floor slab is hardened, a measurer puts in cross control lines according to the positioning piles, and then measures and releases the control lines of each eccentric axis 200 through the cross control lines. The woodworker and the quality inspector check the control line, and after checking the control line accurately, the woodworker draws out the side lines of the beam, the wall, the column and the like according to the design drawing, the design change and other data to control the side line of the template;
2, elevation measurement: according to the control level point, a level gauge is used for measuring the elevation of the plate surface (building elevation) plus 1m of the control point, the control point is marked on the fixed outer frame, and then the elevations of the beam bottom and the plate bottom are measured by a steel ruler or a horizontal pipe according to the control level point. Before the floor slab template is laid and is not fixed with the beam column template, checking the accuracy by matching a level gauge and a steel tape;
2. the steel pipe support frame is erected as follows:
according to the beam-slab layout drawing and the column positioning drawing, the support frame is erected, one batten is padded at the bottom of the steel pipe during the support of the stand column, then the middle horizontal pull rod is erected, the sweeping rod is erected, the distance between the sweeping rod and the ground is 200mm, the stand column is aligned in the longitudinal and transverse directions, meanwhile, the stand columns are uniform in distance, the vertical connection length is long, except for the top layer, the top layer can adopt lap joints, and all other joints must be connected through butt fasteners. The butt joint and the lap joint meet the following regulations: the butt fasteners on the vertical rods should be arranged in a staggered manner: the joints of two adjacent vertical rods are not required to be arranged in the synchronization, and the staggered distance of two spaced apart joints separating one vertical rod in the height direction is not required to be less than 500 mm; the distance from the center of each joint to the master node is preferably not greater than 1/3 for the step distance. The overlapping length is not less than 1m, at least 2 rotating fasteners are adopted for fixing, and the distance from the edge of the end fastener cover plate to the rod end is not less than 100 mm.
Four sides of the template bracket and the middle of the template bracket are provided with a longitudinal and transverse cross brace at every four rows of vertical rods, phi 48 multiplied by 3.Omm steel pipes are selected, and the vertical rods for supporting the main beam are provided with the cross braces with the space not more than 5 meters so as to ensure the integral stability. The longitudinal and transverse shear braces are continuously arranged from bottom to top, have an inclination angle of 45 degrees with the ground and are firmly connected with the vertical rods. In addition, the distance between the first row of vertical rods at the beam end and the column edge is not more than 150 mm.
3. The beam formwork is installed as follows:
the space between the square timbers at the bottom of the beam is not more than 200mm, the square timbers are required to be laid orderly, then the bottom die of the beam is laid, the beam is arranged from two ends to the middle during installation, the stay wires are straightened, the beam is butted with the column heads during laying and then nailed, the side die is sealed in time after the bottom die is laid, the longitudinal space between the beam side die and the column head is 250mm, the square timbers with the thickness of 45 multiplied by 90mm are used for erecting the stop, and when the span of the beam is more than 4 meters, the arching height is 1/1000 of the span.
4. The floor slab template is laid as follows:
1. the process flow comprises the following steps: measuring the height of the index → paving the square timber → paving the template → checking and accepting.
2. Popping up a portal frame elevation control line on the stand column, erecting the portal frame, nailing horizontal large stupefied wood on two sides of the beam according to the elevation, then directly paving square wood on the portal frame, and checking a stay wire until the square wood is leveled.
3. When the span of the slab is more than 4 meters, the arching height of the slab is the same as that of the adjacent beams. When the floor formwork is laid, only the joints and the warping positions are nailed, the middle is nailed as little as possible, so that the formwork can be disassembled, the joints and the warping positions are nailed by iron nails with the length of 40mm, if the width of the floor slab does not meet the formwork modulus, the floor slab is laid from the periphery to the middle when the floor slab is laid, and the middle slab is repaired to close up. The plate seams were taped with adhesive tape.
4. And checking the elevation and the flatness of the board surface and cleaning the board surface.
5. The lower part of the large-section beam is supported as follows:
the large-section beam is supported on the surface of the lower beam plate, and the support frame body needs more steel pipes and battens, so that the bearing capacity is larger; in order to strengthen the supporting force of the floor, the lower first layer of formwork support needs to be disassembled when the concrete strength of the large-section beam reaches 100%, and the lower second layer of formwork support needs to be disassembled when the concrete strength of the large-section beam reaches 50% or above.
The dismantling process flow of the large-section beam template comprises the following steps: the method comprises the steps of loosening a steel pipe support top (separating a keel and a beam bottom template) → loosening split bolts (beams) → dismantling supports and side molds and a plate bottom template → dismantling primary and secondary keels → dismantling horizontal pull rods, cross supports and the steel pipe support top.
2. The concrete cast-in-place structure formwork is dismantled and required:
a. because the formwork support is supported on the reinforced concrete (the design strength of concrete is determined according to a construction drawing) floor of a corresponding floor, in order to ensure the stability of the beam and the quality safety of a concrete structure, the next layer of formwork support by the large-section beam is required to be dismantled after the large-section concrete beam reaches 100% of the design strength.
b. After the girder beam slab concrete pouring is finished, the upper frame structure is still constructed, so the girder beam slab concrete strength must reach 100% of the design strength standard value, and the concrete member is required to be dismantled after the concrete member reaches 28 days of age.
Table 1 is a concrete demold strength requirement list, wherein the "standard value of designed concrete strength" refers to the standard value of concrete cubic compressive strength corresponding to the designed strength grade.
Table 1 concrete stripping strength requirements summary
Figure RE-GDA0003161810830000071
Figure RE-GDA0003161810830000081
c. Before the support and the template are removed, the layer of concrete test piece is sent to a laboratory for detection, and the test piece can be removed when the test piece reaches 100% of the standard value of the designed strength.
3. And (4) detaching the side die of the beam the next day after the whole beam is poured and tamped, and spraying water in time for maintenance.
4. Before the template is dismantled, the safe flat net is arranged on the outer scaffold and the building edge, so that the falling accident of objects at high positions is prevented.
5. The concrete used for removing the side mould is required to ensure that the surface and the edges and corners of the concrete are not damaged.
6. When the dismounting is carried out, the dismounting is carried out block by block, and the loosening, prying or pulling-down of the formed pieces cannot be realized.
7. When the bottom moulds of the platform and the floor slab are dismantled, temporary supports are needed to prevent a large template from falling. When the upright post is disassembled, an operator should stand outside the disassembling range to pull the upright post to disassemble, so that the template is prevented from falling down suddenly and hurting people.
8. Strictly operate in the same vertical plane.
9. When the template is dismantled, impact load is not formed to the floor. The removed templates and supports are easy to be stacked dispersedly and transported in time.
10. The sequence of removal of the template and its supports is controlled strictly.
11. Before the scaffold support is dismantled, sundries such as sporadic objects and the like remained on the high formwork support are removed.
12. When the scaffold support is dismantled, a warning area and a warning sign are set, and professional staff is responsible for warning.
13. When the template and the supporting top are dismantled, the adjustable supporting top of the door type scaffold is loosened, the template is pried by a steel chisel, the template is dismantled, the template and the battens are taken down, and then the horizontal pull rod, the cross brace and the door type scaffold are dismantled. When the steel pipe support top is dismantled, the horizontal pull rod and the cross brace of the auxiliary support top are dismantled, then the adjustable support top is dismantled, and the adjustable support top and the auxiliary support top are lowered. When the lower beam support top with large span is dismantled, the lower beam support top is firstly dismantled from the middle span and towards two ends respectively, and after the template is not thrown at high altitude in the dismantling process, the template surface is cleaned and a release agent is coated. When removing the formwork, the operator should stand in a safe place. The ground is provided with a fence and a warning sign, the template is detached to be cleaned and stacked in time, and a specially-assigned person is assigned to watch, and non-operating personnel are strictly prohibited to enter the system. The demolishing template, the accessory use transport means or rope are tied firmly and are lifted, the indiscriminate throwing is avoided, the accessory should be dismantled and transported along with the transport, and the throwing from high place is strictly forbidden. When the formwork is removed, a special person commands the formwork, a working area is marked below the formwork, a rope and a red and white flag are used for fencing, people temporarily stop passing, a reserved hole person exists in the formwork, the hole opening is covered after the formwork is installed, and the hole opening is covered after the formwork is removed on the concrete slab.
14. The removal of the scaffold supports is controlled to be operated according to the sequence of removing after installation and the following requirements of safe operation under the unified command:
1) the removal of the scaffold support is carried out layer by layer from top to bottom from one end to the other end;
2) the structural parts and the reinforcing parts of the same layer are sequentially arranged from top to bottom and from outside to inside.
3) The full length horizontal bar must be removable when the scaffolding support is removed to the associated portal.
4) Workers must stand on the temporarily arranged scaffold boards to perform disassembly operation and use safety protection articles according to regulations.
5) During the dismantling work, hard objects such as hammers and the like are strictly forbidden to be used for beating and prying, the dismantled connecting rod is placed into the bag, and the cross support is firstly transmitted to the ground and placed in a room for stacking.
6) When the connecting part is disassembled, the locking plate on the lock seat and the locking plate on the clamping hook are firstly rotated to the opening position, and then the disassembling is started, so that the knocking is prohibited because the hard pulling is not needed.

Claims (2)

1. A method for installing a large-section beam formwork is characterized by comprising the following steps: the method comprises the following steps: measuring, erecting a steel pipe support frame, installing a beam template, laying a floor slab template and supporting the lower part of a large-section beam; the specific operation is as follows:
the steel pipe support frame is erected as follows:
according to a beam plate layout drawing and a column positioning drawing, a support frame is erected, when an upright column is supported, firstly, a batten is padded at the bottom of a steel pipe, then a middle horizontal pull rod is erected, then a sweeping rod is erected, the sweeping rod is 200mm high away from the ground, so that the upright column is aligned in the longitudinal and transverse directions, meanwhile, the intervals of the upright column are uniform, the upright column is lengthened, except for the top step of a top layer, the top step can be lapped, and other joints of each step need to be connected by adopting butt fasteners;
the butt joint and the lap joint meet the following regulations: the butt fasteners on the vertical rods should be arranged in a staggered manner: joints of two adjacent vertical rods are not required to be arranged in synchronization, and the staggered distance of two spaced joints separating one vertical rod in the height direction is not required to be less than 500 mm; 1/3, the distance from the center of each joint to the main node is not more than the step distance; the lap length is not less than 1m, the lap length is fixed by not less than 2 rotary fasteners, and the distance from the edge of the end fastener cover plate to the rod end is not less than 100 mm;
four sides of the template bracket and the middle of the template bracket are provided with a longitudinal and transverse cross brace every four rows of vertical rods, phi 48 multiplied by 3.Omm steel pipes are selected, and the vertical rods for supporting the main beam are provided with the cross braces with the spacing not more than 5 meters so as to ensure the integral stability; the longitudinal and transverse shear braces are continuously arranged from bottom to top, have an inclination angle of 45 degrees with the ground, are firmly connected with the upright posts, and are not more than 150mm away from the column edge of the first row of upright posts at the beam end;
the beam formwork is installed as follows: the space between the square timbers at the bottom of the beam is not more than 200mm, the beam bottom die is laid immediately after the square timbers are laid orderly, the beam bottom die is arranged from two ends to the middle when in installation, a stay wire is straight, the beam bottom die is butted with a column head first when in laying and is nailed, the side die is sealed in time after the bottom die is laid, the longitudinal space between the beam side die and the column head is 250mm, the square timbers with the size of 45 multiplied by 90mm are used for erecting a stop, and when the beam span is more than 4 meters, the arching height is 1/1000 of the span;
the floor slab template is laid as follows: measuring the height of the index → paving the square timber → paving the template → checking and accepting; popping up a portal frame elevation control line on an upright column, erecting a portal frame, nailing horizontal large corrugated wood on two sides of a beam according to elevation, directly paving square wood on the portal frame, and checking by using a pull wire until the square wood is level; 2. when the span of the plate is more than 4m, the arching height of the plate is the same as that of the adjacent beam; when the floor template is laid, only the joints and the warping parts are nailed firmly, the middle part is not nailed so as to be convenient for removing the template, the joints and the warping parts are nailed firmly by iron nails with the length of 40mm, if the width of the floor slab does not meet the template modulus, the floor slab is laid from the periphery to the middle part when the floor slab is laid, the middle patch plate is closed, and the slab seams are well stained by adhesive tape paper; 3. checking the elevation and the flatness of the board surface, and cleaning the board surface;
the lower part of the large-section beam is supported as follows: the large-section beam is supported on the surface of the lower beam plate, and the support frame body needs more steel pipes and battens, so that the bearing capacity is larger; in order to strengthen the supporting force of the floor, the lower first layer of formwork support needs to be disassembled when the concrete strength of the large-section beam reaches 100%, and the lower second layer of formwork support needs to be disassembled when the concrete strength of the large-section beam reaches 50% or above.
2. The method for installing a large-section beam formwork of claim 1, wherein: the measurements are as follows:
a. paying off the floor: after the newly poured concrete of the floor slab is hardened, a measurer puts in cross control lines according to the positioning piles, and then measures and releases the control lines of each eccentric axis 200 through the cross control lines; the woodworker and the quality inspector check the control line, and after checking the control line accurately, the woodworker draws the side line of the beam, the wall and the column out according to the design drawing and the design change data to control the side line of the template;
b. and (3) elevation guiding and measuring: according to the control level point, a level gauge is used for guiding and measuring the elevation of the plate surface plus 1m of the control point, the control point is marked on a fixed outer frame, and then a steel ruler or a horizontal pipe is used for guiding and measuring the elevation of the beam bottom and the plate bottom according to the point; and (4) checking the accuracy of the beam column template before the floor template is laid and is not fixed with the beam column template by matching a level gauge and a steel tape.
CN202110600337.6A 2021-05-31 2021-05-31 Installation method of large-section beam template Pending CN113266148A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115961782A (en) * 2022-12-27 2023-04-14 中铁八局集团第一工程有限公司 Formwork construction method for large-storey height and large-span building

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
A20181111: "大截面梁模板施工方案", 《豆丁建筑》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115961782A (en) * 2022-12-27 2023-04-14 中铁八局集团第一工程有限公司 Formwork construction method for large-storey height and large-span building
CN115961782B (en) * 2022-12-27 2024-09-24 中铁八局集团第一工程有限公司 Formwork construction method for large-rise and large-span building

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