CN112796511A - Supporting structure and construction method of double-layer fair-faced concrete arc-shaped roof formwork - Google Patents
Supporting structure and construction method of double-layer fair-faced concrete arc-shaped roof formwork Download PDFInfo
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- CN112796511A CN112796511A CN202110161363.3A CN202110161363A CN112796511A CN 112796511 A CN112796511 A CN 112796511A CN 202110161363 A CN202110161363 A CN 202110161363A CN 112796511 A CN112796511 A CN 112796511A
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- 238000009415 formwork Methods 0.000 title claims abstract description 74
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 85
- 239000010959 steel Substances 0.000 claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000009435 building construction Methods 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 13
- 239000004570 mortar (masonry) Substances 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 239000002023 wood Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000001680 brushing effect Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 93
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
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- 239000002344 surface layer Substances 0.000 description 2
- 238000005056 compaction Methods 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
- 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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B7/00—Roofs; Roof construction with regard to insulation
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Abstract
The invention discloses a supporting structure and a construction method of a double-layer fair-faced concrete arc-shaped roof template, which comprises a top layer template unit, a secondary pouring concrete layer, a roof building construction method layer, a primary pouring concrete layer, a bottom layer template unit, a supporting frame body and a blanking port template closure unit, wherein the top layer template unit, the secondary pouring concrete layer, the roof building construction method layer, the primary pouring concrete layer, the bottom layer template unit and the supporting frame body are sequentially connected from top to bottom; the top layer template unit comprises a top layer double-spliced channel steel main keel, a top layer n-shaped beam secondary keel and a top layer arc clear water template which are sequentially connected from top to bottom, the bottom layer template unit comprises a bottom layer arc clear water template, a bottom layer n-shaped beam secondary keel, a bottom layer double-spliced channel steel main keel and a double steel pipe keel which are sequentially connected from top to bottom, the support frame body comprises a plurality of frame body cross rods and frame body vertical rods which are mutually buckled, the top end of each frame body vertical rod is connected with the double steel pipe keel through a top support, and the bottom end of each frame body vertical rod is; the invention has the advantages of simple processing, high installation precision and high rigidity, can meet the precision requirement of the bare concrete on the formwork erection, and further improves the construction efficiency.
Description
Technical Field
The invention belongs to the technical field of concrete roof formwork erection, and particularly relates to an erection structure and a construction method of a double-layer fair-faced concrete arc-shaped roof formwork.
Background
Due to attractive appearance, the slope roof is beneficial to drainage, is widely applied to the field of building design, particularly to some stadium buildings, and is designed into arc slope roofs even by adopting fair-faced concrete for construction in order to create special building atmosphere. However, the formwork support and assembly of the cast-in-place structure of the arc-shaped roof are relatively complex, and the cast-in-place structure is designed to be a fair-faced concrete roof, so that the construction period of the roof structure is long, and particularly, the support construction of the fair-faced concrete formwork of the surface layer of the arc-shaped roof becomes a key factor of the fair-faced concrete construction of the roof under the condition that the exposed concrete surfaces of the upper layer and the lower layer of the roof are required to achieve the effect of the fair-faced concrete.
Ordinary concrete sloping roof surface course concrete construction is the manual work receive the face press polish can, the roof concrete upper surface need not to add horizontal template, but double-deck clear water concrete roof then need add the clear water concrete surface effect of concrete upper template in order to reach the designing requirement, how to install and consolidate roof upper clear water concrete surface arc template is vital to accomplishing the pouring of enclosure space concrete, must solve the problem that the template of roofing upper concrete pouring feed opening department erected.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a supporting structure and a construction method of a double-layer fair-faced concrete arc-shaped roof formwork, which solve the problems that the traditional roof formwork supporting system is small in rigidity and difficult to ensure the quality, and provide a supporting method of a formwork closure unit at a concrete feed opening when secondary pouring of roof fair-faced concrete is performed, so that the roof surface layer concrete is poured in a closed space.
In order to achieve the purpose, the supporting structure of the double-layer fair-faced concrete arc-shaped roof template provided by the invention comprises a top layer template unit, a secondary pouring concrete layer, a roof building construction method layer, a primary pouring concrete layer, a bottom layer template unit, a supporting frame body and a blanking port template closure unit which are sequentially connected from top to bottom; top layer template unit includes from last to the top layer double-pin channel-section steel main joist, the nearly word roof beam secondary joist of top layer and the clear water template of top layer arc that connects gradually down, bottom template unit includes from last to the bottom arc clear water template, the nearly word roof beam secondary joist of bottom, the two-pin channel-section steel main joist and two steel pipe fossil fragments of bottom that connect gradually down, support the support body and include support body horizontal pole and support body pole setting that a plurality of mutual lock joints set up, the top of support body pole setting is held in the palm and is linked to each other and the bottom links to each other with the wood springboard with two steel pipe.
Preferably, the support frame body is provided with a cross brace and a reinforced inclined brace for reinforcing the horizontal stability of the support frame body;
preferably, the bottom of the bottom double-spliced channel steel main keel is provided with a keel fulcrum piece connected with the double steel pipe keels, the bottom double-spliced channel steel main keel and the bottom inverted-V-shaped beam secondary keel are connected through an inverted-V-shaped beam connecting piece, and the bottom inverted-V-shaped beam secondary keel is connected with the bottom arc clear water template through a self-tapping screw;
preferably, hook bolts for reinforcing the top formwork unit are pre-embedded in the primary poured concrete layer, and the hook bolts sequentially penetrate through the roof building construction method layer, the secondary poured concrete layer and the top formwork unit from bottom to top and then are fixedly connected with nuts;
preferably, the bottom-layer double-spliced channel steel main keels are connected through horizontally arranged connecting bolts, connecting steel plates are arranged at the connecting ends of the bottom-layer double-spliced channel steel main keels, and two bolt holes for bolt connection are respectively formed in the connecting steel plates and flange plates of the bottom-layer double-spliced channel steel main keels;
preferably, the roof structure further comprises a feed opening template closure unit arranged on one side of the ridge, wherein the width of the feed opening template closure unit is 500-700mm, and the feed opening template closure unit comprises a top-layer double-spliced channel steel main keel, a top-layer cross beam secondary keel and a top-layer arc-shaped clear water template which are sequentially arranged from top to bottom and are fixed through bolts;
preferably, the eave formwork unit further comprises an eave formwork unit, the eave formwork unit comprises a bottom layer double-spliced channel steel main keel, a bottom layer inverted-V-shaped beam secondary keel, a vertical formwork I, a primary poured concrete layer, a vertical formwork II, a bottom layer inverted-V-shaped beam secondary keel and a bottom layer double-spliced channel steel main keel which are sequentially connected from outside to inside through a three-section screw, and two ends of the three-section screw are fixed through screw mountain-shaped nuts;
preferably, the construction method of the erecting structure of the double-layer fair-faced concrete arc-shaped roof formwork comprises the following steps:
step 1: (1) processing a bottom double-spliced channel steel main keel: the arc-shaped annular ribs are uniformly blanked by a plasma numerical control cutting machine, the other straight-section components adopt a cutting form, all the components are uniformly assembled and welded and corrected after being finished, and then a plurality of keel fulcrum components are uniformly welded below the bottom double-spliced channel steel main keel; (2) processing a bottom layer arc-shaped clear water template: notches with the notch depth of 9mm and the interval of 5cm are formed in the back surface of the bottom layer arc-shaped clear water template;
step 2: horizontally placing the bottom double-spliced channel steel main keels on a template operation platform according to bolt hole intervals, placing the bottom inverted V-shaped beam secondary keels at intervals, and firmly fixing the inverted V-shaped beam secondary keels by using the inverted V-shaped beam connecting pieces; fixing the bottom layer arc-shaped clear water template and the bottom layer inverted T-shaped beam secondary keel together by using the self-tapping screws, and reinforcing from the rear side;
and step 3: before the frame body upright stanchion is erected, paying off and positioning are carried out on the position of the frame body upright stanchion on a structural surface in advance, the space keeps one-to-one correspondence with the top layer double-spliced channel steel main keel, a wood springboard is laid at the bottom end, a top support is placed at the top end of the frame body upright stanchion, and a double steel pipe keel is placed on the top support; the frame body cross rods and the frame body vertical rods are synchronously erected and connected into a whole, and meanwhile, the cross braces are arranged;
and 4, step 4: integrally hoisting a large template assembly unit formed by connecting the bottom layer inverted T-shaped beam secondary keel and the bottom layer double-assembly channel steel main keel to the double-steel-pipe keel in the step 3, and fixing the large template assembly unit through a connecting bolt; then, a reinforcing diagonal brace is additionally arranged at the bottom of the main keel of the bottom double-spliced channel steel;
and 5: uniformly brushing a release agent on the surface of the bottom layer arc-shaped clear water template, then performing reinforcement binding, hook bolt embedding and concrete pouring operation to form a primary poured concrete layer, constructing a roof building construction method layer on the roof primary poured concrete layer, and performing special waterproof treatment on the root of the hook bolt;
step 6: the method for assembling the top layer arc-shaped clear water template is the same as the step 2, and the installation position of the template is controlled by utilizing the conical plug arranged on the hook bolt, so that the secondary pouring concrete thickness of the roof is ensured; installing a template box pre-embedded at a roof drainage eaves gutter in advance before installing a large template assembly unit, and accurately reserving the position of a blanking port template closure unit along one side of a ridge;
and 7: pouring the secondary concrete pouring layer on the roof, slowly pouring the concrete at the discharge opening, manually and uniformly paving stone-removing mortar with the thickness of 20mm and the same mixing ratio as the concrete on the concrete surface, and then installing discharge opening template closure units piece by piece along the direction of the ridge and fixing the discharge opening template closure units by using connecting bolts;
preferably, the step 4 further comprises a construction method of a supporting structure of the formwork unit at the eave position, and the bottom double-spliced channel steel main keel, the bottom n-shaped beam secondary keel, the vertical formwork I, the once poured concrete layer, the vertical formwork II, the bottom n-shaped beam secondary keel and the bottom double-spliced channel steel main keel are oppositely pulled by using a three-section type screw and are integrally reinforced through a screw steel gasket and a screw mountain-shaped nut.
The invention provides a supporting structure and a construction method of a double-layer fair-faced concrete arc-shaped roof template, which have the following beneficial effects:
the invention has the advantages of simple processing and manufacturing, high installation precision and large rigidity of the large formwork system, and can meet the precision requirement of the bare concrete on the formwork erection. Meanwhile, the lower opening template closure unit arranged at the concrete lower opening of the ridge provides a solution for secondary pouring of roof surface concrete under the closed space, and the method is simple to operate and convenient to install, and can further improve the construction efficiency.
Drawings
Fig. 1 is a structural schematic diagram of a combination of a bottom formwork unit and a support frame body of a supporting structure of a double-layer fair-faced concrete arc-shaped roof formwork provided by the invention;
FIG. 2 is a schematic view of a fastening structure of a bottom layer arc-shaped fair-faced formwork of a bottom layer formwork unit of the erecting structure of the double-layer fair-faced concrete arc-shaped roof formwork, a bottom layer double-spliced channel steel main keel and a bottom layer inverted V-shaped beam secondary keel;
FIG. 3 is a schematic structural diagram of a pre-buried hook bolt of the erecting structure of the double-layer fair-faced concrete arc-shaped roof formwork provided by the invention;
FIG. 4 is a schematic connection diagram of a main keel of a roof concrete formwork of a supporting structure of a double-layer fair-faced concrete arc-shaped roof formwork provided by the invention;
FIG. 5 is a schematic structural diagram of a combination of a top formwork unit and a bottom formwork unit of a supporting structure of a double-layer fair-faced concrete arc-shaped roof formwork provided by the invention;
FIG. 6 is a schematic structural diagram of a feed opening template closure unit of the erecting structure of the double-layer fair-faced concrete arc-shaped roof template provided by the invention;
in the figure:
1-wood gangplank 2-frame upright stanchion 3-frame cross bar 4-cross brace 5-reinforced diagonal brace 6-top support 7-keel pivot piece 8-double steel pipe keel 9-bottom double-spliced channel steel main keel 10-bottom I-beam secondary keel 11-I-beam connecting piece 12-three-section screw 13-conical plug 14-bottom arc clear water template 15-self-tapping screw 17-screw steel gasket 18-screw E-nut 19-connecting steel plate 20-connecting bolt 21-hook bolt 22-once pouring concrete layer 23-roof building construction method layer 24-template box 25-top arc clear water template 26-top I-beam secondary keel 27-top double-spliced channel steel main keel 28-twice pouring concrete layer 29-blanking concrete layer 29 Die plate closure unit 30-bolt hole.
Detailed Description
The present invention will be further described with reference to the following specific embodiments and accompanying drawings to assist in understanding the contents of the invention.
As shown in fig. 1-6, the supporting structure of the double-layer fair-faced concrete arc-shaped roof formwork provided by the invention comprises a top formwork unit, a secondary pouring concrete layer 28, a roof building construction layer 23, a primary pouring concrete layer 22, a bottom formwork unit, a support frame body and a blanking opening formwork closure unit 29 which are sequentially connected from top to bottom; as shown in fig. 5, the top formwork unit includes a top double-spliced channel main joist 27, a top cross beam secondary joist 26 and a top arc-shaped clear formwork 25 connected in sequence from top to bottom. As shown in fig. 2, the bottom formwork unit comprises a bottom arc-shaped clear water formwork 14, a bottom beam secondary joist 10, a bottom double-spliced channel steel main joist 9 and a double steel pipe joist 8 which are sequentially connected from top to bottom. As shown in fig. 1, the support frame body comprises a plurality of frame body cross rods 3 and frame body upright rods 2 which are arranged in a staggered mode, the top ends of the frame body upright rods 2 are connected with double steel pipe keels 8 through top supports 6, and the bottom ends of the frame body upright rods are connected with the wood springboard 1. The supporting frame body is provided with a cross brace 4 and a reinforced inclined brace 5 which are used for reinforcing the horizontal stability of the supporting frame body.
As shown in fig. 1 and 2, the bottom of bottom two-piece channel steel main joist 9 is provided with a joist fulcrum piece 7 connected with a double steel pipe joist 8, the bottom two-piece channel steel main joist 9 and the bottom n-shaped beam secondary joist 10 are connected through a n-shaped beam connecting piece 11, and the bottom n-shaped beam secondary joist 10 is connected with a bottom arc clear water template 14 through a self-tapping screw 15. Connecting bolt 20 that sets up through the level between the bottom double pin channel-section steel main joist 9 links to each other, and the link of bottom double pin channel-section steel main joist 9 is provided with steel connecting plate 19, sets up two bolt holes 30 that are used for bolted connection on steel connecting plate 19 and the flange board of bottom double pin channel-section steel main joist 9 respectively.
As shown in fig. 3, hook bolts 21 for reinforcing the top formwork unit are embedded in the primary poured concrete layer 22, and the hook bolts 21 sequentially penetrate through the roof construction method layer 23, the secondary poured concrete layer 28 and the top formwork unit from bottom to top and then are fixedly connected with nuts.
As shown in fig. 6, the lower opening template closure unit 29 is arranged on one side of the ridge, the width of the lower opening template closure unit 29 is 500-700mm, and the lower opening template closure unit comprises a top-layer double-spliced channel steel main keel 27, a top-layer cross beam secondary keel 26 and a top-layer arc clear water template 25 which are sequentially arranged from top to bottom and are fixed through bolts.
As shown in fig. 1 and 5, the eave formwork unit is further included, the eave formwork unit comprises a bottom double-spliced channel steel main keel 9, a bottom n-shaped beam secondary keel 10, a first vertical formwork, a once-poured concrete layer 22, a second vertical formwork, a bottom n-shaped beam secondary keel 10 and a bottom double-spliced channel steel main keel 9 which are sequentially connected from outside to inside through a three-section screw 12, and two ends of the three-section screw 12 are fixed through a screw mountain-shaped nut 18.
The invention provides a supporting structure and a construction method of a double-layer fair-faced concrete arc-shaped roof template, which comprises the following steps:
step 1: (1) processing a bottom double-spliced channel steel main keel 9: according to a system deepening design drawing, performing stereotyped processing, in order to ensure the processing precision, uniformly blanking arc-shaped annular ribs by using a plasma numerical control cutting machine to ensure that the arc-shaped annular ribs completely accord with a building design modeling curve, uniformly assembling and welding and correcting other straight-section components in a cutting mode after the components are finished, and correcting deformation generated in the welding process; then, uniformly welding a plurality of keel pivot parts 7 below the bottom double-spliced channel steel main keel 9; (2) processing a bottom layer arc-shaped clear water template 14: considering that the radius of the arc section is smaller, in order to facilitate the arc of the template to follow the arc and prevent the surface of the panel from cracking and reduce the tension after the panel is installed, the template needs to be processed, and notches with the depth of 9mm and the distance of 5cm are formed in the back surface of the bottom layer arc-shaped clear water template 14;
step 2: horizontally placing the bottom double-spliced channel steel main keels 9 on a template operation platform according to the intervals of the bolt holes 30, placing bottom inverted V-shaped beam secondary keels 10 at intervals, and firmly fixing the inverted V-shaped beam secondary keels by using inverted V-shaped beam connecting pieces 11; fixing the bottom layer arc-shaped clear water template 14 and the bottom layer inverted T-shaped beam secondary keel 10 together by using self-tapping screws 15, and reinforcing from the rear side to avoid the occurrence of nail lines on the front side;
and step 3: before the frame body upright stanchion 2 is erected, paying off and positioning are carried out on the frame body upright stanchion position 2 on the structural surface in advance, the space and the top layer double-spliced channel steel main keel 27 keep a one-to-one correspondence relationship, a wood springboard 1 is laid at the bottom end, a top support 6 is placed at the top end of the frame body upright stanchion 2, and a double steel pipe keel 8 is placed on the top support 6; the frame body cross rod 3 and the frame body upright stanchion 2 are synchronously erected and connected into a whole, and meanwhile, a cross brace 4 is arranged; the height of the frame body upright stanchion 2 is calculated in advance, the heights of a bottom layer arc clear water template 14, a bottom layer template n-shaped beam secondary keel 10, a bottom layer template double-spliced channel steel main keel 9 and a top support 6 are deducted, the length of a double steel pipe keel 8 is selected and matched, and the joint with the frame body upright stanchion 2 is prevented from being in the same position;
and 4, step 4: integrally hoisting a large template assembly unit formed by connecting a bottom layer inverted T-shaped beam secondary keel 10 and a bottom layer double-assembly channel steel main keel 9 to the double-steel-pipe keel 8 in the step 3, fixing the large template assembly unit through a connecting bolt 20, and controlling the height of the integral template through the elevations at two ends of the arc-shaped large template assembly unit; then, after the large template assembly units are installed block by block, a reinforcing inclined strut 5 is additionally arranged at the bottom of the main keel 9 of the bottom layer double-assembly channel steel;
and 5: uniformly brushing a release agent on the surface of the bottom layer arc-shaped clear water template 14, then performing reinforcement binding, hook bolt 21 pre-embedding and concrete pouring operation to form a primary poured concrete layer 22, constructing a roof building construction method layer 23 on the roof primary poured concrete layer 22, and performing special waterproof treatment on the root of the hook bolt 21 to ensure the roof waterproof effect;
step 6: the method for assembling the large formwork unit of the top-layer arc-shaped clear water formwork 25 is the same as the step 2, and the formwork installation position is controlled by utilizing the conical plug 13 arranged on the hook bolt 21, so that the thickness of secondary roof pouring concrete 28 is ensured; a template box 24 pre-embedded at a roof drainage eaves gutter is installed in advance before a large template is installed, and the position of a blanking hole template closure unit is accurately reserved along one side of a ridge;
and 7: and (3) carrying out pouring construction of a secondary concrete layer 28 of the roof, slowly pouring concrete at the discharge port, then manually and uniformly paving stone-removing mortar with the thickness of 20mm and the same mixing ratio as the concrete on the concrete surface, and then installing discharge port template closure units 29 piece by piece along the direction of the ridge and fixing the discharge port template closure units by using connecting bolts 20. During installation, the feed opening template closing unit 29 is firstly contacted with mortar on one side far away from the ridge to form a certain angle, and then the installation angle is gradually reduced to gradually drive the mortar on the surface of the concrete to the ridge. When the installation angle can not be reduced, namely the feed opening template closure unit 29 is completely contacted with the mortar, a flat vibrator is used for vibrating the back of the feed opening template closure unit 29 to gradually compact the mortar on the surface of the concrete, and the excess mortar is extruded along with the vibration and the compaction of the feed opening template closure unit, so that the concrete pouring in the closed space is completed, and meanwhile, the concrete surface is ensured to achieve the effect of fair-faced concrete.
And step 4, a construction method of a supporting structure of the template unit at the eave position is further included, and the bottom layer double-spliced channel steel main keel 9, the bottom layer inverted V-shaped beam secondary keel 10, the vertical template I, the once-poured concrete layer 22, the vertical template II, the bottom layer inverted V-shaped beam secondary keel 10 and the bottom layer double-spliced channel steel main keel 9 are oppositely pulled by using the three-section type screw 12 and are integrally reinforced through the screw steel gasket 17 and the screw mountain-shaped nut 18.
The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. A supporting structure of a double-layer fair-faced concrete arc-shaped roof template is characterized by comprising a top layer template unit, a secondary pouring concrete layer, a roof building construction method layer, a primary pouring concrete layer, a bottom layer template unit, a supporting frame body and a lower opening template closure unit which are sequentially connected from top to bottom; top layer template unit includes from last to the top layer double-pin channel-section steel main joist, the nearly word roof beam secondary joist of top layer and the clear water template of top layer arc that connects gradually down, bottom template unit includes from last to the bottom arc clear water template, the nearly word roof beam secondary joist of bottom, the two-pin channel-section steel main joist and two steel pipe fossil fragments of bottom that connect gradually down, support the support body and include support body horizontal pole and support body pole setting that a plurality of mutual lock joints set up, the top of support body pole setting is held in the palm and is linked to each other and the bottom links to each other with the wood springboard with two steel pipe.
2. The erecting structure of a double-deck fair-faced concrete arc-shaped roof formwork as claimed in claim 1, wherein the support frame body is provided with a cross brace and a reinforcing diagonal brace for reinforcing the horizontal stability of the support frame body.
3. The supporting structure of the double-layer fair-faced concrete arc-shaped roof formwork as claimed in claim 1, wherein the bottom of the bottom double-spliced channel steel main keel is provided with a keel fulcrum piece connected with the double-steel-pipe keel, the bottom double-spliced channel steel main keel and the bottom cross beam secondary keel are connected through a cross beam connecting piece, and the bottom cross beam secondary keel and the bottom arc-shaped fair-faced formwork are connected through self-tapping screws.
4. The erecting structure of the double-layer fair-faced concrete arc-shaped roof formwork as claimed in claim 1, wherein hook bolts for reinforcing the top formwork unit are pre-embedded in the primary poured concrete layer, and the hook bolts sequentially penetrate through the roof building construction method layer, the secondary poured concrete layer and the top formwork unit from bottom to top and then are fixedly connected with nuts.
5. The erecting structure of the double-layer fair-faced concrete arc-shaped roof formwork as claimed in claim 1, wherein the bottom double-spliced channel steel main keels are connected through horizontally arranged connecting bolts, connecting steel plates are arranged at the connecting ends of the bottom double-spliced channel steel main keels, and two bolt holes for bolt connection are respectively formed in the flange plates of the connecting steel plates and the bottom double-spliced channel steel main keels.
6. The erecting structure of the double-layer fair-faced concrete arc-shaped roof formwork as claimed in claim 1, wherein the lower opening formwork closure unit is arranged on one side of a ridge, the length of the lower opening formwork closure unit is 1.2m, the width of the lower opening formwork closure unit is 500-700mm, and the upper opening formwork closure unit comprises a top-layer double-assembly channel steel main keel, a top-layer cross beam secondary keel and a top-layer arc-shaped fair-faced formwork which are sequentially arranged from top to bottom and are fixed through hook bolts.
7. The supporting structure of the double-layer fair-faced concrete arc-shaped roof formwork as claimed in claim 1, further comprising an eave formwork unit, wherein the eave formwork unit comprises a bottom double-spliced channel steel main keel, a bottom beam secondary keel, a first vertical formwork, a one-step poured concrete layer, a second vertical formwork, a bottom beam secondary keel and a bottom double-spliced channel steel main keel which are sequentially connected from outside to inside through a three-section screw, and two ends of the three-section screw are fixed through screw mountain-shaped nuts.
8. The construction method of the erecting structure of the double-layer fair-faced concrete arc-shaped roof formwork as claimed in any one of claims 1 to 7, wherein the construction method comprises the following steps:
step 1: (1) processing the bottom double-spliced channel steel main keel: the arc-shaped annular ribs are uniformly blanked by a plasma numerical control cutting machine, the other straight-section components adopt a cutting form, all the components are uniformly assembled and welded and corrected after being finished, and then a plurality of keel fulcrum components are uniformly welded below the bottom double-spliced channel steel main keel; (2) processing a bottom layer arc-shaped clear water template: notches with the notch depth of 9mm and the interval of 5cm are formed in the back surface of the bottom layer arc-shaped clear water template;
step 2: horizontally placing the bottom double-spliced channel steel main keels on a template operation platform according to bolt hole intervals, placing the bottom inverted V-shaped beam secondary keels at intervals, and firmly fixing the inverted V-shaped beam secondary keels by using the inverted V-shaped beam connecting pieces; fixing the bottom layer arc-shaped clear water template and the bottom layer inverted T-shaped beam secondary keel together by using the self-tapping screws, and reinforcing from the rear side;
and step 3: before the frame body upright stanchion is erected, paying off and positioning are carried out on the position of the frame body upright stanchion on a structural surface in advance, the space keeps one-to-one correspondence with the top layer double-spliced channel steel main keel, a wood springboard is laid at the bottom end, a top support is placed at the top end of the frame body upright stanchion, and a double steel pipe keel is placed on the top support; the frame body cross rods and the frame body vertical rods are synchronously erected and connected into a whole, and meanwhile, the cross braces are arranged;
and 4, step 4: integrally hoisting a large template assembly unit formed by connecting the bottom layer inverted T-shaped beam secondary keel and the bottom layer double-assembly channel steel main keel to the double-steel-pipe keel in the step 3, and fixing the large template assembly unit through a connecting bolt; then, a reinforcing diagonal brace is additionally arranged at the bottom of the main keel of the bottom double-spliced channel steel;
and 5: uniformly brushing a release agent on the surface of the bottom layer arc-shaped clear water template, then performing reinforcement binding, hook bolt embedding and concrete pouring operation to form a primary poured concrete layer, constructing a roof building construction method layer on the roof primary poured concrete layer, and performing special waterproof treatment on the root of the hook bolt;
step 6: the method for assembling the top layer arc-shaped clear water template is the same as the step 2, and the installation position of the template is controlled by utilizing the conical plug arranged on the hook bolt, so that the secondary pouring concrete thickness of the roof is ensured; installing a template box pre-embedded at a roof drainage eaves gutter in advance before installing a large template assembly unit, and accurately reserving the position of a blanking port template closure unit along one side of a ridge;
and 7: and (3) carrying out pouring construction of the secondary pouring concrete layer on the roof, slowly pouring concrete at the discharge opening, then manually and uniformly paving stone-removing mortar with the thickness of 20mm and the same mixing ratio as the concrete on the concrete surface, and then installing discharge opening template closure units piece by piece along the direction of the ridge and fixing the discharge opening template closure units by using connecting bolts.
9. The construction method of the erecting structure of the double-layer fair-faced concrete arc-shaped roof formwork as claimed in claim 8, wherein the step 4 further comprises a construction method of the erecting structure of the formwork unit at the eave position, and the bottom double-spliced channel steel main keel, the bottom cross beam secondary keel, the vertical formwork I, the primary concrete pouring layer, the vertical formwork II, the bottom cross beam secondary keel and the bottom double-spliced channel steel main keel are oppositely pulled by using a three-section screw and integrally reinforced by a screw steel gasket and a screw mountain nut.
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