CN113374209B - UHPC external wall panel and back attached steel frame connection method - Google Patents
UHPC external wall panel and back attached steel frame connection method Download PDFInfo
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- CN113374209B CN113374209B CN202110700146.7A CN202110700146A CN113374209B CN 113374209 B CN113374209 B CN 113374209B CN 202110700146 A CN202110700146 A CN 202110700146A CN 113374209 B CN113374209 B CN 113374209B
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- external wall
- steel frame
- wall panel
- embedded bolt
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 80
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 7
- 239000004567 concrete Substances 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 230000008602 contraction Effects 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000012209 synthetic fiber Substances 0.000 claims description 3
- 229920002994 synthetic fiber Polymers 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 4
- 239000010440 gypsum Substances 0.000 description 16
- 229910052602 gypsum Inorganic materials 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 239000004744 fabric Substances 0.000 description 12
- 239000011347 resin Substances 0.000 description 11
- 229920005989 resin Polymers 0.000 description 11
- 239000000741 silica gel Substances 0.000 description 9
- 229910002027 silica gel Inorganic materials 0.000 description 9
- 238000007790 scraping Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- 230000001680 brushing effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 238000004018 waxing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
- E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
- E04F13/0801—Separate fastening elements
- E04F13/0803—Separate fastening elements with load-supporting elongated furring elements between wall and covering elements
- E04F13/0805—Separate fastening elements with load-supporting elongated furring elements between wall and covering elements with additional fastening elements between furring elements and the wall
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
- E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
- E04F13/0801—Separate fastening elements
- E04F13/0803—Separate fastening elements with load-supporting elongated furring elements between wall and covering elements
- E04F13/081—Separate fastening elements with load-supporting elongated furring elements between wall and covering elements with additional fastening elements between furring elements and covering elements
Abstract
The invention provides a connection method of an UHPC external wall board and a back attached steel frame, which comprises the following steps: step one, manufacturing a back attached steel frame; the back-attached steel frame is slightly smaller than the UHPC outer wall and comprises two longitudinal square steels arranged in parallel and a plurality of transverse square steels arranged between the two longitudinal square steels; step two, mounting the corner connector on the back-attached steel frame; one end of the angle bracket is pre-connected with the back-attached steel frame through a bolt and a nut, an embedded bolt is arranged at the other end of the angle bracket, an embedded sleeve is arranged at the nut end of the embedded bolt, and the embedded bolt is fixed on the angle bracket through the embedded sleeve and a fixing nut; pouring the UHPC external wall panel; and fourthly, fixing the embedded bolts in the UHPC external wall panel. The UHPC external wall panel is cast by adopting an ultra-high performance concrete (UHPC) material with good working performance, self-leveling can be realized after casting, the use of vibrating equipment is reduced, and the construction period and the production cost are saved.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a method for connecting an UHPC external wall panel with a back attached steel frame.
Background
Ultra-high performance concrete, namely UHPC (Ultra-High Performance Concrete), is the most innovative cement-based engineering material in the past three decades, and has good durability and excellent wear resistance and anti-riot performance, so that the UHPC is suitable for the field of building decoration.
The fixing modes of the UHPC outer wall decorative plate are various, when the back-attached steel frame is adopted for connection, the problem that the connection firmness of the back-attached steel frame and the UHPC outer wall plate and the positioning accuracy of the back-attached steel frame are required to be guaranteed, and the research on the connection mode of the back-attached steel frame and the UHPC outer wall plate exists in the prior art, so that a new method for realizing firm connection between the UHPC outer wall plate and the back-attached steel frame is needed.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to providing a method for connecting a UHPC external wall panel with a back-attached steel frame, so as to solve the problem of the prior art that the connection between the back-attached steel frame and the UHPC external wall panel is not firm.
To achieve the above and other related objects, the present invention provides a method for connecting a UHPC external wall panel with a back-attached steel frame, comprising the steps of:
step one, manufacturing a back attached steel frame; the back-attached steel frame is slightly smaller than the UHPC outer wall and comprises two longitudinal square steels arranged in parallel and a plurality of transverse square steels arranged between the two longitudinal square steels;
step two, mounting the corner connector on the back-attached steel frame; one end of the angle bracket is pre-connected with the back-attached steel frame through a bolt and a nut, an embedded bolt is arranged at the other end of the angle bracket, an embedded sleeve is arranged at the nut end of the embedded bolt, and the embedded bolt is fixed on the angle bracket through the embedded sleeve and a fixing nut;
pouring the UHPC external wall panel; pouring UHPC concrete pouring materials from one side of a pouring die to the other side, and finishing one-time pouring;
fixing the embedded bolts in the UHPC external wall panel; before the initial setting of concrete, the back-attached steel frame is hoisted to the UHPC external wall panel after pouring, the part of the embedded bolt provided with the embedded sleeve is placed in the UHPC external wall panel, so that the upper surface of the embedded sleeve is flush with the upper surface of the UHPC external wall panel, and then the embedded bolt and the corner brace connected with the UHPC external wall panel are loosened, so that the embedded bolt freely moves in a plane along with the hardening process of the concrete within the range of the reserved hole of the corner brace.
As the preferred technical scheme, in the step two, offer the little round hole, big round hole, vertical rectangular hole, the horizontal rectangular hole that are used for installing embedded bolt on the angle sign indicating number, the diameter of little round hole slightly is greater than embedded bolt's diameter, the diameter of big round hole is greater than the diameter of little round hole, the width of vertical rectangular hole slightly is greater than embedded bolt's diameter, the width of horizontal rectangular hole slightly is greater than embedded bolt's diameter.
As a preferable technical scheme, the diameter d=a+b+e=8+2+2=12 mm of the small round hole;
the diameter d=a+2b+2c=8+2×2+2×5=22 mm of the large circular hole;
the length l=a+2b+2c=8+2×2+2×5=22 mm and the width d=a+b+e=8+2+2=12 mm of the vertically elongated holes;
the length l=a+2b+2c=8+2×2+2×5=22 mm and the width d=a+b+e=8+2+2=12 mm of the transverse elongated hole;
wherein a is the diameter of the mounting embedded bolt, and the diameter is 8mm;
b is the positioning deviation of the embedded bolt, and the positioning deviation is + -2 mm;
e is the punching precision of the embedded bolt, and the punching precision is + -2 mm;
c is the maximum expansion or contraction value in the plane under the temperature load, and takes + -5 mm.
As the preferable technical scheme, the small round hole is arranged at the central position of the corner brace, the transverse strip hole and the small round hole are arranged side by side transversely, the vertical strip hole and the small round hole are arranged side by side longitudinally, and the large round hole is arranged outside the transverse strip hole and the longitudinal strip hole.
In the second step, a plurality of corner brackets are uniformly arranged along the length direction of the longitudinal square steel, and the middle part of the transverse square steel is provided with the corner brackets.
In the third step, the UHPC concrete casting material comprises the following components in parts by weight: 100 parts of UHPC premixed powder, 1.82 parts of synthetic fiber, 1.19 parts of water reducer and 7.5 parts of water
As a preferable technical scheme, the preparation method of the UHPC concrete casting material comprises the following steps: adding the weighed premixed powder into a stirring barrel, starting up and stirring for 1min, adding the water reducer and water by a metering pump, continuously stirring uniformly, manually adding fibers after 6 min, stirring for 3-5 min, and stopping.
As described above, the present invention has the following advantageous effects:
(1) The UHPC external wall panel is cast by adopting an ultra-high performance concrete (UHPC) material with good working performance, self-leveling can be realized after casting, the use of vibrating equipment is reduced, and the construction period and the production cost are saved.
(2) The UHPC external wall panel is cast by adopting an ultra-high performance concrete (UHPC) material, has good mechanical property and durability, can reduce the thickness of the wall panel on the premise of meeting the safety requirement, is connected with a main body structure through a back-attached steel frame, transfers load to the main body structure of a building through the back-attached steel frame, has small stress, can be used for manufacturing an external wall panel with light weight, high strength and attractive appearance, and solves the problems of high manufacturing cost, difficult hoisting construction and connection with the main body structure and the like caused by heavy weight of the external wall panel.
(3) According to the invention, the back-attached steel frame is integrally hoisted and positioned after concrete pouring, and the embedded bolts are placed into the UHPC wallboard before initial setting, so that the efficient and accurate positioning of the multi-point embedded connecting piece is realized, and the problem that the embedded sleeve in the UHPC external wallboard is difficult to be connected with the bolts on the steel frame due to the embedded positioning error in the post-connection method is avoided.
(4) According to the invention, bolt positioning deviation and hole opening precision are considered, and the hardening shrinkage deformation of concrete in the manufacturing process and the collision shrinkage deformation caused by temperature change in the using process are considered, and the constraint release is realized by arranging the strip-shaped holes and the large round holes on the corner brace, so that the problem that the UHPC external wall panel is cracked due to the internal stress concentration caused by the over constraint of the embedded bolt is avoided.
(5) According to the invention, after the embedded bolt is placed in the UHPC external wall panel after pouring, the embedded bolt and the corner brace connected with the UHPC external wall panel are loosened, so that the embedded bolt can freely move in a plane along with the concrete hardening process within the range of the reserved hole of the corner brace, and the damage to the embedded bolt caused by the stress generated by the hardening shrinkage of the concrete is avoided.
Drawings
FIG. 1 is a schematic view showing the structure of the UHPC outer wall decorative plate of the present invention.
FIG. 2 shows a second schematic structural view of the UHPC exterior wall decoration board of the present invention.
Fig. 3 is a schematic view of a structure of the back-attached steel frame of the present invention.
Fig. 4 is a schematic view showing an installation structure of the embedded bolt of the present invention.
Fig. 5 shows a schematic view of the structure of the corner bracket hole according to the present invention.
Wherein, the reference numerals specifically explain as follows: UHPC external wall panel 1, back attached steel frame 2, angle sign indicating number 3, pre-buried bolt 4, pre-buried sleeve 5, fixation nut 6, little round hole 7, big round hole 8, horizontal rectangular hole 9, vertical rectangular hole 10.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1 to 5. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
The invention provides a connection method of an UHPC external wall board and a back-attached steel frame, wherein the UHPC external wall board and the back-attached steel frame are combined to form an UHPC external wall decorative board. The UHPC external wall panel 1 is connected with the building main body through the back attached steel frame 2. The UHPC external wall panel 1 is a strip-shaped rough surface texture panel, the concave-convex rough surface effect shows the texture of manual chiseling, the length is 5870mm, the width is 1405mm, the thickness of the bottom plate is 25mm, and the protruding height of the surface strip shape is 25mm. The back-attached steel frame 2 comprises two longitudinal square steels arranged in parallel and a plurality of transverse square steels arranged between the two longitudinal square steels. The angle brace 3 evenly is provided with a plurality of along the length direction of vertical square steel, and the middle part of horizontal square steel is provided with angle brace 3. The back-attached steel frame 2 adopts 120X60X4 hot dip galvanized rectangular steel pipes, M8X 25 bolts are arranged in the plates, and the bolts are connected with the steel frame by L50X 5 corner brackets 3. The manufacturing of the UHPC outer wall decorative plate comprises the following steps:
step one, manufacturing a gypsum master model, and manually chiseling out surface textures on the surface of the gypsum master model. The method specifically comprises the following steps:
s1.1, placing a PVC board on a flat table top, and drawing a scraper diagram on the PVC board by using tools such as a T-square, a triangular square, a nicking tool and the like according to a sectional view of the UHPC external wall board 1;
s1.2, cutting off the scraper blade shape along the drawing line by using a curve saw;
s1.3, vertically clamping the sawed scraping plate on a file platform, and polishing the working surface of the scraping plate with a rigid file and a sand skin until the surface is smooth;
s1.4, manufacturing a wood frame according to the size of the scraping plate, and nailing the scraping plate on the wood frame;
s1.5, taking smooth and clean marble as a table top, taking straight aluminum alloy as a datum line of gypsum drawing, fixing one surface, and waxing the table top and the aluminum alloy;
s1.6, putting a certain amount of water in a container, uniformly spraying gypsum powder, and naturally soaking gypsum for 5-10 minutes;
s1.7, uniformly stirring the soaked gypsum and then pouring the gypsum on a table top;
s1.8, tightly abutting one side of the scraping plate with nails against aluminum alloy, pushing out the gypsum body for multiple times by taking the aluminum alloy as a datum line, enabling the plane of the scraping plate to be perpendicular to a table board during scraping, and pouring gypsum slurry on a model once for each pushing until the surface of a gypsum female die is smooth and flat and meets the requirements;
s1.9, manually knocking out the concave-convex texture on the gypsum surface after scraping and forming by using an axe according to the requirements of the surface texture of the UHPC external wall panel 1.
And step two, turning over the gypsum master model to prepare the silica gel mould. The method specifically comprises the following steps:
s2.1, blocking the intersection with aluminum alloy or other materials to enable the intersection to be completely matched with the gypsum female die or to be repaired to achieve matching;
s2.2, waxing the intersecting opening and the gypsum female die by using a brush to serve as an isolation layer;
s2.3, stirring silica gel;
s2.4, pouring the evenly stirred silica gel on the gypsum female die, and standing, curing and forming after the silica gel completely covers the gypsum female die for forming.
And step three, manufacturing a pouring die formed by combining the glass fiber reinforced plastic bottom die and the silica gel die. The method specifically comprises the following steps:
s3.1, placing a silica gel mold at the bottom of the glass fiber reinforced plastic bottom mold, and shearing fine mesh cloth, coarse mesh cloth and binding bands according to the size of the silica gel mold and the thickness and layering requirements of the glass fiber reinforced plastic bottom mold;
s3.2, preparing surface layer resin (the resin proportion is shown in table 1), uniformly stirring, and brushing the surface layer resin on the surface of the silica gel mold by using a hairbrush uniformly;
s3.3, after the surface layer resin is solidified, preparing fine mesh cloth resin, uniformly stirring, and uniformly brushing the fine mesh cloth resin on the surface of the silica gel mold by using a hairbrush;
s3.4, uniformly spreading the fine mesh cloth on the model, uniformly coating the fine mesh cloth with brush fine mesh cloth resin while using the brush fine mesh cloth resin to uniformly soak the fine mesh cloth, and using a batch knife and a brush to drive and press the fine mesh cloth to be smooth and remove bubbles;
s3.5, brushing a layer of coarse mesh cloth resin, brushing thoroughly each time, and continuously finishing 4-5 layers of mesh cloth according to the mould and production requirements;
s3.6, standing and curing the die, wherein the time is generally not less than 24 hours;
s3.7, polishing and removing attachments in the die by using a steel wire ball, checking if holes and holes are leaked and pitted surfaces exist, and polishing by using sand skin after repairing resin; polishing with water sand belt until the surface of the die is smooth and clean and lines are smooth; and finally, the die is washed clean, and burrs at the intersection of the die are cut by a cutting machine.
TABLE 1 conventional resin formulation
And fourthly, stirring the UHPC concrete casting material. The UHPC concrete pouring material is prepared from Ductal NaW3 UHPC premixed powder, kuraray RF350 x 12 synthetic fibers and F4 water reducer, which are produced by Lafaji Haorei investment Co., ltd, and the mixing ratio is NaW3: RF350: f4: water = 100:1.82:1.19: mixing at a ratio of 7.5. The preparation method comprises the following steps: adding the weighed premixed powder into a stirring barrel, starting up and stirring for 1min, adding a water reducing agent and water by a metering pump, continuously stirring uniformly, manually adding fibers after 6 min, stopping stirring for 3-5 min, and checking whether ultra-high performance concrete (UHPC) is uniformly stirred. The stirred slurry should be poured within 40 minutes, and the secondary water addition is strictly forbidden.
And fifthly, pouring UHPC concrete pouring materials to form the UHPC external wall panel 1. Pouring the uniformly mixed slurry from one side of the die to the other side, and finishing one-time pouring; in the forming process, workers use clean scrapers and shovels to carry out preliminary trowelling, and pay attention to keep clean and strictly prevent pollution; pouring molding is preferably carried out by adopting self-leveling or self-compacting slurry or adopting an internal and external auxiliary vibration process to carry out compaction, and the plugging and tamping are strictly forbidden; after the UHPC external wall panel is molded, a plastic film is covered immediately, so that the surface of the external wall panel is prevented from water loss cracking. The concrete produced by the same batch of raw materials, the same proportion and the same process should be kept with compressive strength test pieces per shift, and the concrete comprises a group of demoulding strength test pieces and a group of 28d standard curing test pieces.
And step six, placing and positioning the back-attached steel frame 2. The angle code 3 is installed on the back attached steel frame 2, a small round hole 7, a large round hole 8, a vertical strip hole 10 and a horizontal strip hole 9 for installing the embedded bolt 4 are formed in the angle code 3, the diameter of the small round hole 7 is slightly larger than that of the embedded bolt 4, the diameter of the large round hole 8 is larger than that of the small round hole 7, the width of the vertical strip hole 10 is slightly larger than that of the embedded bolt 4, and the width of the horizontal strip hole 9 is slightly larger than that of the embedded bolt 4. The whole plate is centered on the middle small round hole 7 (the small round hole 7 is fixed and does not allow shrinkage), the transverse strip hole 9 does not allow vertical shrinkage (collision) because of being parallel to the small round hole 7, only the shrinkage (collision) value in the horizontal direction is considered, the vertical strip hole 10 is the same, the transverse shrinkage (expansion) is not allowed, only the shrinkage (expansion) value in the vertical direction is considered, the large round hole 8 simultaneously considers the shrinkage (expansion) in the horizontal direction and the shrinkage (expansion) in the vertical direction, and the size of the open holes in different shapes is calculated as follows:
(1) the diameter of the small round hole 7 mainly considers the positioning deviation + -2 mm and the perforating precision + -2 mm of the M8 bolt, and is tentatively set
(2) Theoretical estimation of the diameter of the large round hole 8:
D＝a+2b+2c＝8+2×2+2×5＝22mm
wherein, the diameter of the a-M8 bolt is 8mm;
b- -positioning deviation of M8 bolts is considered according to +/-2 mm;
c- -maximum expansion (contraction) value in plane under temperature load, maximum air temperature at 60℃and minimum air temperature at-17℃at 1.05X10× (60 ℃ to (-17 ℃) at) 6000=4.9mm.apprxeq.5 mm.
(3) The length direction theory of the vertical strip hole 10 is as above, and is 22mm; the positioning deviation and the hole opening precision of the M8 bolt are mainly considered in the width direction, and the width direction is tentatively 12mm;
(4) the expansion (contraction) value can be theoretically calculated according to the 2 nd strip according to the plate width of 1.4m along the length direction of the transverse strip hole 9, and the positioning deviation is about 15mm, and the uniformity of angle steel processing is considered to be 22mm; the positioning deviation and the hole forming precision of the M8 bolt are mainly considered in the width direction, and the width direction is tentatively 12mm.
One end of the angle bracket 3 is pre-connected with the back-attached steel frame 2 through a bolt nut, an embedded bolt 4 is pre-installed at the other end of the angle bracket 3, an embedded sleeve 5 is fixedly installed at the nut end of the embedded bolt 4, the embedded bolt 4 is fixed on the angle bracket 3 through a fixing nut 6, the embedded bolt 4 is positioned at the center of a strip hole or a large round hole 8, the back-attached steel frame 2 is hoisted onto the UHPC external wall board 1 before the initial setting of concrete, the part of the embedded bolt 4 provided with the embedded sleeve 5 is placed into the poured UHPC external wall board 1, after the pouring of concrete is completed, the embedded bolt 4 and the angle bracket 3 are loosened, the embedded bolt 4 is in a completely loose state between the angle bracket 3, and the embedded bolt 4 and the concrete are in cooperative deformation.
Step seven, standing and maintaining; after the component is molded, a plastic film is covered on the surface of the die immediately to avoid water loss; the average temperature of the environment is preferably higher than 10 ℃ during natural maintenance, and when the average temperature of the environment is lower than 10 ℃ or the minimum temperature is lower than 5 ℃, the construction treatment is carried out according to the winter, and heat preservation measures are adopted. The UHPC external wall panel is preferably naturally cured to reduce surface color difference.
Step eight, lifting and demoulding; the demoulding test piece is needed to be made when the UHPC external wall panel is manufactured, and the demoulding test piece can be demoulded when the measured compressive strength of the demoulding test piece reaches more than 40% of the design strength of the UHPC. After demolding, the surface of the UHPC external wall panel is required to be treated, a part higher than the mold is polished and leveled by a polishing machine, and the back-covered steel frame and the embedded bolts 4 are required to be screwed up before demolding, so that the UHPC external wall panel and the back-covered steel frame 2 are reliably connected, and the safety of hoisting and transportation is ensured.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (4)
1. The connection method of the UHPC external wall panel and the back attached steel frame is characterized by comprising the following steps of:
step one, manufacturing a back attached steel frame; the back-attached steel frame is slightly smaller than the UHPC outer wall and comprises two longitudinal square steels arranged in parallel and a plurality of transverse square steels arranged between the two longitudinal square steels;
step two, mounting the corner connector on the back-attached steel frame; one end of the angle bracket is pre-connected with the back-attached steel frame through a bolt and a nut, an embedded bolt is arranged at the other end of the angle bracket, an embedded sleeve is arranged at the nut end of the embedded bolt, and the embedded bolt is fixed on the angle bracket through the embedded sleeve and a fixing nut; the angle code is provided with a small round hole, a large round hole, a vertical strip hole and a transverse strip hole for installing the embedded bolt, the diameter of the small round hole is slightly larger than that of the embedded bolt, the diameter of the large round hole is larger than that of the small round hole, the width of the vertical strip hole is slightly larger than that of the embedded bolt, and the width of the transverse strip hole is slightly larger than that of the embedded bolt; the small round hole is arranged at the center of the corner brace, the transverse strip hole and the small round hole are arranged side by side in the transverse direction, the vertical strip hole and the small round hole are arranged side by side in the longitudinal direction, and the large round hole is arranged outside the transverse strip hole and the longitudinal strip hole; the angle brackets are uniformly arranged along the length direction of the longitudinal square steel, and the middle part of the transverse square steel is provided with the angle brackets;
pouring the UHPC external wall panel; pouring UHPC concrete pouring materials from one side of a pouring die to the other side, and finishing one-time pouring;
fixing the embedded bolts in the UHPC external wall panel; before the initial setting of concrete, the back-attached steel frame is hoisted to the UHPC external wall panel after pouring, the part of the embedded bolt provided with the embedded sleeve is placed in the UHPC external wall panel, so that the upper surface of the embedded sleeve is flush with the upper surface of the UHPC external wall panel, and then the embedded bolt and the corner brace connected with the UHPC external wall panel are loosened, so that the embedded bolt freely moves in a plane along with the hardening process of the concrete within the range of the reserved hole of the corner brace.
2. The method for connecting UHPC external wall panel and back-attached steel frame as claimed in claim 1, wherein,
the diameter d=a+b+e=8+2+2=12 mm of the small circular hole;
the diameter d=a+2b+2c=8+2×2+2×5=22 mm of the large circular hole;
the length l=a+2b+2c=8+2×2+2×5=22 mm and the width d=a+b+e=8+2+2=12 mm of the vertically elongated holes;
the length l=a+2b+2c=8+2×2+2×5=22 mm and the width d=a+b+e=8+2+2=12 mm of the transverse elongated hole;
wherein a is the diameter of the mounting embedded bolt, and the diameter is 8mm;
b is the positioning deviation of the embedded bolt, and the positioning deviation is + -2 mm;
e is the punching precision of the embedded bolt, and the punching precision is + -2 mm;
c is the maximum expansion or contraction value in the plane under the temperature load, and takes + -5 mm.
3. The method for connecting the UHPC external wall panel and the back-attached steel frame according to claim 1, wherein in the third step, the UHPC concrete casting material comprises the following components in parts by weight: 100 parts of UHPC premixed powder, 1.82 parts of synthetic fiber, 1.19 parts of water reducer and 7.5 parts of water.
4. The method for connecting the UHPC external wall panel and the back-attached steel frame as claimed in claim 3, wherein the preparation method of the UHPC concrete casting material is as follows: adding the weighed premixed powder into a stirring barrel, starting up and stirring for 1min, adding the water reducer and water by a metering pump, continuously stirring uniformly, manually adding fibers after 6 min, stirring for 3-5 min, and stopping.
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| CN105128132A (en) * | 2015-07-28 | 2015-12-09 | 捷雅石建材工业（苏州）有限公司 | Manufacturing method for novel glass fiber reinforced cement external wall plate |
| CN109049294A (en) * | 2018-08-03 | 2018-12-21 | 上海住信住宅工业有限公司 | A kind of concrete prefabricated wallboard and its production technology |
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| CN110984246A (en) * | 2020-01-17 | 2020-04-10 | 贵州省建筑设计研究院有限责任公司 | Anti-floating anchor rod structure of concrete bottom plate of super-long basement |
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| CN105128132A (en) * | 2015-07-28 | 2015-12-09 | 捷雅石建材工业（苏州）有限公司 | Manufacturing method for novel glass fiber reinforced cement external wall plate |
| CN109049294A (en) * | 2018-08-03 | 2018-12-21 | 上海住信住宅工业有限公司 | A kind of concrete prefabricated wallboard and its production technology |
| CN110056097A (en) * | 2019-03-07 | 2019-07-26 | 上海君道住宅工业有限公司 | A kind of fiberglass gridding ultra-high performance concrete heat preservation decoration integrative assembling type outer wall plate |
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