CN108505645B - CL composite concrete shear wall cast-in-place construction method - Google Patents

CL composite concrete shear wall cast-in-place construction method Download PDF

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Publication number
CN108505645B
CN108505645B CN201810260251.1A CN201810260251A CN108505645B CN 108505645 B CN108505645 B CN 108505645B CN 201810260251 A CN201810260251 A CN 201810260251A CN 108505645 B CN108505645 B CN 108505645B
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China
Prior art keywords
concrete
wall
plate
self
sealing
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CN201810260251.1A
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CN108505645A (en
Inventor
宋梦
刘保林
余恩
王强
潘俊波
卢东伟
刘允才
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Huanghe Science and Technology College
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Huanghe Science and Technology College
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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
    • E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E04B2/56—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members
    • 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
    • E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
    • E04G11/08—Forms, which are completely dismantled after setting of the concrete and re-built for next pouring
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast

Abstract

The construction method for the CL composite concrete shear wall in-situ pouring comprises the following steps: (1) lifting the CL net rack plate; (2) placing the CL net rack plate on a temporary field adjacent to a construction site; (3) a plurality of positioning and adjusting components are uniformly arranged on two side surfaces of the CL net rack plate; (4) the CL net rack plates provided with the positioning and adjusting assemblies are conveyed to a wall construction site by using a trolley, and are sequentially hoisted into CL net rack plate installation control lines by using a tower crane and are butted; (5) installing a wall formwork; (6) and pouring self-sealing concrete downwards from the top of the wall formwork. The invention is suitable for the construction of CL composite concrete shear walls with different thicknesses, ensures the levelness of the upper end edge of the wall body template of the inner wall of the wall body, improves the construction quality, and avoids the defects of external thermal insulation of the outer wall and insufficient durability of the internal thermal insulation of the outer wall; realizing the modernization of the building industry and the factory production of building products.

Description

CL composite concrete shear wall cast-in-place construction method
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a cast-in-place construction method for a CL composite concrete shear wall.
Background
The CL building system is a brand-new composite concrete shear wall building system, and a core component of the CL composite concrete shear wall is a wall body which integrates stress and heat preservation and is formed by pouring concrete on two sides of a CL net frame plate (a net frame which is formed by clamping EPS heat preservation plates in two layers of steel bar welding nets in a deviated middle way and then fixing the two layers of steel bar welding nets by using split bolts). The system has the following characteristics: replacing clay bricks; the defects of external thermal insulation of the outer wall and insufficient durability of the internal thermal insulation of the outer wall are solved; the thickness of the wall body is reduced, and the use area is enlarged by 5-8 percent; realizing the modernization of the building industry and the factory production of building parts.
In the construction process of the existing cast-in-place reinforced concrete shear wall, the CL net rack plate also needs to be carried, the existing carrying process completely depends on manual work, the labor intensity is high, the efficiency is low, and because the two sides of the CL net rack are both provided with steel wire meshes, workers are easy to touch the steel wire meshes to be injured in the carrying process; the height of the template is not easy to adjust when the template is supported; and because the design size of the outer protective layer of the wall body can not be accurately controlled, the problems that the building quality is influenced by rib leakage, fracture, bulging and the like of the wall body after the template is removed can be caused, so that the quality of the cast-in-place reinforced concrete wall body is seriously influenced, and the problems are not well solved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the CL composite concrete shear wall cast-in-place construction method which has the advantages of low labor intensity, safe carrying, high construction efficiency, capability of ensuring the cast thickness of the wall body, capability of adjusting the cast thickness of the wall body, easiness in adjusting the height of the template and good construction quality.
In order to solve the technical problems, the invention adopts the following technical scheme: the cast-in-place construction method of the CL composite concrete shear wall comprises the following steps,
(1) lifting the CL net rack plate: the CL rack plate is a nonstandard block, the CL composite shear wall is decomposed according to the arrangement condition of the CL composite shear wall in the construction drawing and according to a node detail drawing in the construction drawing and a related technical specification and a construction joint reservation condition, the specification, the size, the peripheral node characteristics, the number and the position of the CL rack plate are expressed in detail, and the CL rack plate is communicated with a professional manufacturer in advance through an order form to produce and supply a goods plan;
(2) placing the purchased CL net rack plate in a temporary field adjacent to a construction site;
(3) uniformly arranging a plurality of positioning and adjusting components on two side surfaces of the CL net rack plate in the leveled construction site; meanwhile, ejecting a wall form in-place control line and a CL grid plate installation control line on a construction site;
(4) the CL net rack plates provided with the positioning and adjusting assemblies are conveyed to a wall construction site by using a trolley, the CL net rack plates are sequentially hoisted into CL net rack plate installation control lines by using a tower crane and are butted, a temporary protection frame is erected by using steel pipes to temporarily position the CL net rack plates, and the temporary protection frame is fixed on a steel bar prefabricated from the foundation to the top in the shear wall;
(5) wall formworks are respectively installed on the inner side and the outer side of the CL net frame plate according to a formwork in-place control line, a formwork leveling device is arranged on the lower side edge of the wall formwork, and the leveling device is operated to level the upper edge of the wall formwork so as to ensure the levelness of the top edge of the wall surface; an operation platform is erected above the wall formwork by adopting a scaffold, the operation platform consists of a platform plate, a guardrail and a ladder, the temporary protective frame is gradually removed in the process of installing the wall formwork, so that the positioning adjusting components arranged on the inner side and the outer side of the CL net frame plate are respectively contacted with the wall formwork, and a wall penetrating bolt and a plastic sleeve are arranged at a preset position;
the template leveling device comprises a horizontally arranged channel steel, the open side of the channel steel is downwards arranged, the lower surface of the channel steel is fixedly connected with at least two fixing nuts, the fixing nuts are uniformly arranged at intervals along the length direction of the channel steel, round holes corresponding to the screw holes of the fixing nuts are formed in the channel steel up and down, the inner diameter of each round hole is larger than or equal to the inner diameter of each screw hole of each fixing nut, a leveling bolt is connected to the screw hole of each fixing nut in a threaded manner, the head of each leveling bolt is positioned above the channel steel, and the lower end of each leveling bolt is; the lower end edge of the wall template is supported outside the upper surface of the channel steel;
the hinged support comprises a ball head and a supporting block, the width of the supporting block is smaller than the width of an opening at the bottom of the channel steel, the bottom of the supporting block is a plane, a ball head socket is arranged on the upper surface of the supporting block, the lower end of the leveling bolt is fixedly connected with the top of the ball head, and the ball head is rotatably connected in the ball head socket; a reinforcing rib is arranged between the side part of the fixed nut and the inside of the channel steel; the upper bolt of the leveling nut is connected with a fastening nut, and the lower end surface of the fastening nut is in top pressure contact with the upper surface of the channel steel;
the process of operating the template leveling device to adjust the levelness of the wall template comprises the following steps: firstly, loosening the fastening nut by using a wrench, then clamping the head of the leveling bolt by using the wrench, screwing the leveling bolt, driving the channel steel to move up and down by using the fixing nut in threaded connection with the leveling bolt, driving the wall body template to realize height adjustment by using the channel steel, and screwing the fastening nut to be in jacking contact with the channel steel after the top edge of the wall body template is kept horizontal, wherein the wall body template is in seamless connection with a horizontal template arranged at the bottom of a roof;
(6) and pouring self-sealing concrete into the cavity between the CL net frame plate and the wall formwork at the inner side and the cavity between the CL net frame plate and the wall formwork at the outer side from the top of the wall formwork.
The CL rack plate comprises a polystyrene board with a rectangular structure, an inner steel wire mesh and an outer steel wire mesh are respectively arranged on the inner side and the outer side of the polystyrene board and are connected through oblique inserted steel bars penetrating through the polystyrene board, a convex rib is arranged on one side edge of the polystyrene board in the vertical direction, and a sealing positioning groove is formed in the other side edge of the polystyrene board in the vertical direction; the cross sections of the convex edge strips and the sealing positioning grooves are the same in shape and size;
the positioning and adjusting component in the step (3) comprises an inner concrete block and an outer concrete block, the outer side of the inner concrete block is in contact with the inner side face of the polyphenyl plate, the inner side of the outer concrete block is in contact with the outer side face of the polyphenyl plate, the positioning sleeve penetrates through the polyphenyl plate along the inner horizontal direction and the outer horizontal direction, the inner end portion of the positioning sleeve is embedded in the inner concrete block, the outer end portion of the positioning sleeve is embedded in the outer concrete block, the portion, in contact with the inner concrete block, of an inner steel wire mesh is embedded in the inner concrete block, the portion, in contact with the outer concrete block, of the outer steel wire mesh is embedded in the outer concrete block, the outer end portion of the inner adjusting rod extends into and is in threaded connection with the inner port of the positioning sleeve, the inner end portion of the outer adjusting rod extends into and is in threaded connection with the outer port of the positioning sleeve, an inner limiting plate is fixedly arranged at the inner end of the inner adjusting rod; the outer concrete block is in a circular truncated cone-shaped structure with thick inside and thin outside, and the inner concrete block is in a circular truncated cone-shaped structure with thick outside and thin inside;
the specific manufacturing and installation process for setting the positioning and adjusting assembly in the step (3) is as follows: firstly, horizontally placing a CL net rack plate in a field, enabling the inner side of a polyphenyl plate to face upwards, uniformly forming a plurality of through holes in the polyphenyl plate, enabling a positioning sleeve to penetrate through the through holes, enabling the length of the positioning sleeve to be slightly larger than the distance between an inner steel wire mesh and an outer steel wire mesh, enabling the lower end of the positioning sleeve to be in contact with the ground, coaxially sleeving a mould which is in a circular truncated cone shape and is provided with two through ends, outside the positioning sleeve, enabling the edge of the upper end of the mould to be flush with the positioning sleeve, enabling the edge of the lower end of the mould to be in contact with the polyphenyl plate, forming a through seam for penetrating through the steel wire mesh on the mould, adding concrete into the mould, tamping, scraping off redundant concrete, leveling the top surface of; inserting positioning sleeves into other through holes on the polystyrene board in sequence according to the operation process and manufacturing an inner concrete block; after the inner concrete blocks are completely manufactured, watering and curing the inner concrete blocks, turning up the polystyrene board after at least two days, and manufacturing the outer concrete module according to the manufacturing process of the inner concrete module; after the outer concrete module is watered and maintained, the outer end part of the inner adjusting rod extends into and is in threaded connection with the inner port of the positioning sleeve, and the inner end part of the outer adjusting rod extends into and is in threaded connection with the outer port of the positioning sleeve.
The cart in the step (4) comprises a bottom plate, universal wheels with locking mechanisms are arranged on the bottom surface of the bottom plate, a vertical frame is fixedly arranged on the rear side of the upper surface of the bottom plate, the front side of the vertical frame is arranged in a manner that the front side is low in front and high in back, handrails are arranged on the left side and the right side of the middle part of the rear side of the vertical frame, a support frame is arranged on the upper part of the rear side of the vertical frame, a small hydraulic station is arranged on the support frame, a pushing oil cylinder is fixedly arranged at the top of the small hydraulic station along the front-back horizontal direction, a hooking oil cylinder is fixedly arranged at the front end of a piston rod of the pushing oil cylinder along the vertical direction, a positioning nail is arranged at the lower end of the piston rod of the hooking oil cylinder, the pushing oil cylinder and the hooking oil cylinder are both connected with the small hydraulic station;
the process that the cart in the step (4) conveys the CL net rack plate provided with the positioning and adjusting assembly to a wall construction site comprises the following steps: placing a plurality of CL net frame plates on a bottom plate side by side, enabling a CL net frame plate on the last side to lean against a vertical frame in an inclined mode, enabling other CL net frame plates to lean against adjacent CL net frame plates on the back side in sequence, operating an operation panel, pushing a piston rod of an oil cylinder to extend forwards to a position right above the CL net frame plate on the foremost side to stop, enabling a piston rod of a hook oil cylinder to extend downwards, positioning and pinning the piston rod inside the upper end face of a polystyrene board, and enabling a worker to hold an armrest to push a cart to convey the CL net frame plates to a wall construction site; two annular steel wire ropes are connected to a lifting hook of the tower crane, a piston rod of a pushing oil cylinder is controlled to extend firstly, the upper part of a CL net frame plate at the foremost side is pushed to move forwards to a vertical state through a hooking oil cylinder and a positioning nail, one annular steel wire rope is hung on two inner concrete blocks or outer concrete blocks at the same height at the front side of the CL net frame plate, a worker holds the CL net frame plate in the vertical state firstly, then the piston rod of the hooking oil cylinder is controlled to retract upwards, a positioning needle is separated from the polystyrene plate, the piston rod of the pushing oil cylinder is controlled to move backwards to the upper side of the next polystyrene plate, the piston rod of the hooking oil cylinder extends downwards, the positioning nail is fixed into the polystyrene plate, then the other annular steel wire rope is hung on the two outer concrete blocks or inner concrete blocks at the rear side of the CL net frame plate, the outer concrete blocks and the inner concrete blocks hung by the two annular steel wire, hoisting the CL rack plate to the specified position of the CL rack plate installation control line; sequentially hoisting all CL net rack plates on the cart in place according to the process; in the tower crane operation process, the other cart is provided with the CL net frame plate and pushed to a construction site, the two carts transport the CL net frame plate in turn, and the tower crane does not stop hoisting the CL net frame plate in place; in the process of hoisting the CL rack plate in place, the two adjacent polystyrene boards are matched with the sealing positioning groove through the convex ribs to achieve the effect of positioning and sealing, and meanwhile, the two adjacent and connected inner steel wire meshes and the two adjacent and connected outer steel wire meshes are connected into a whole by using the lapping net sheets and the iron wires, and the inner steel wire meshes are also connected with the steel bars prefabricated in the shear wall body.
Before the wall body formwork is installed in the step (5), a release agent is coated on the inner wall of the wall body formwork, the inner limiting plate and the outer limiting plate are rotated in advance according to the thickness of the wall body, the inner adjusting rod moves inwards while rotating in the positioning sleeve, the outer adjusting rod moves outwards while rotating in the positioning sleeve until the distance between the inner limiting plate and the outer limiting plate is equal to the thickness of the wall body, and then the wall body formwork on the inner side is in contact with the inner limiting plate and the wall body formwork on the outer side is in contact with the outer limiting plate.
In the step (6), because the inner steel wire mesh and the outer steel wire mesh are dense, the distance between the outer side of the polystyrene board and the wall body template is small, and the self-compacting concrete with the designed strength grade is adopted, and the self-compacting concrete can reach the following working performance: within 5 seconds, the slump is 260-280 mm, the expansion degree is 600-750 mm, the workability is good, and no visual bleeding or segregation phenomenon exists;
the material of the self-compacting concrete should meet the following requirements:
cementing materials: cement; the cement adopts 42.5 silicate, ordinary silicate cement and slag silicate cement;
coarse aggregate: stones; the stones are continuous graded pebbles or gravels with the grain diameter of 5-10 mm;
fine aggregate: sand; the sand is medium sand with a larger fineness modulus which is more than or equal to 2.6;
water: clean drinking water is adopted;
blending materials: fly ash I and fly ash II or ground slag and a small amount of expanding agent are added into self-sealing concrete, the admixture is well prepared before use, and the fly ash with small water ratio is used as much as possible;
additive: the common water reducing agent can not reach the water reducing degree and the improved workability required by high-performance concrete, and a superplasticizer or a high-efficiency water reducing agent is generally required to be added; the naphthalene-based superplasticizers of different manufacturers are compounded and used according to a proportion, the interaction among the components of the blended product is mutually adjusted, the respective advantages are exerted, and the super-superposition effect is obtained; besides the water reducing agent, an air entraining agent, an early strength agent or a retarder and a pumping aid are added in a proper amount according to the actual engineering situation.
The concrete process of pouring the self-sealing concrete in the step (6) is as follows: when the self-sealing concrete is pumped, a funnel or a baffle is arranged at the upper opening of the wall body template after the self-sealing concrete falls from the opening of the delivery pipe, so that the concrete enters a mold at a slow speed, the height difference h of the liquid level of the self-sealing concrete generated by different resistance and flow rates of the self-sealing concrete at any section in the wall body template at two sides of the polystyrene board is not more than 400 mm, namely the size of the self-sealing concrete slurry level at the outer side higher than the self-sealing concrete slurry level at the inner side is controlled within 400 mm; in the process of pouring the self-sealing concrete, a specially-assigned person is arranged to observe the liquid level height of the concrete of each section, the liquid level height can be measured through flashlight irradiation and inserted rod during observation, and when the liquid level height difference of the self-sealing concrete at a certain section is close to 400 mm, the self-sealing concrete is poured at the point immediately.
In order to control the flow rate of self-sealing concrete on the inner side and the outer side of the CL net frame plate, a steel pipe for a scaffold is vertically inserted into the thicker side to control the section in the pouring process of the self-sealing concrete, a hook is welded on the steel pipe so as to be conveniently drawn out, and the inner limiting plate and the outer limiting plate play a role of limiting the polystyrene board to keep a vertical state when the polystyrene board is subjected to the pressure of the self-sealing concrete; the mold-entering temperature of the self-sealing concrete is controlled to be 5-35 ℃, and the self-sealing concrete pouring point is arranged at the intersection part of the cross-shaped, T-shaped or L-shaped wall body so as to facilitate the uniform flow of the self-sealing concrete; the same pouring point is preferably used for the push type continuous pouring, and when the pouring points are switched, the next layer of self-sealing concrete is poured before the initial setting of the self-sealing concrete of the front layer.
In the step (6), in order to achieve the purpose of smooth surface when the self-sealing concrete is poured, auxiliary vibration is carried out outside the wall formwork, and a leather hammer, a small flat vibrator or a vibrating rod vibrates from bottom to top along with the pouring of the self-sealing concrete in an auxiliary vibration mode; when the hidden column with a complex steel bar structure or the middle part of the composite shear wall is poured, a small vibrating rod is adopted for proper inserting and tamping, and the obliquely inserted steel bars of the CL net rack plate cannot be touched during inserting and tamping.
When the wall body formwork is in place in the step (5), mortar is paved on the lower part of the wall body formwork or mortar joints are hooked after the wall body formwork is in place, so that mortar return on the lower part of the wall body formwork is prevented;
the wall template frame of the door and window opening is fixedly provided with steel plate corner protectors by wood screws, and the overall rigidity of the door and window frame is ensured and the corners are prevented from deforming and leaking slurry by adopting thickened frames and increased diagonal supports;
sealing the splicing seams of all the wall formworks by adopting a sponge sealing strip pressing measure; auxiliary measures of sticking plastic adhesive tapes or applying sealant can be adopted at local parts as necessary, so that the leakage of cement mortar is practically avoided;
air vents are reserved at internal corners or other dead corners of the opening, the self-sealing concrete is timely observed during pouring, and the self-sealing concrete is immediately plugged after being filled to prevent mortar from losing.
By adopting the technical scheme, the invention adopts the mode that at least two trolleys transport and install the CL net rack plate of the positioning and adjusting assembly, and the tower crane does not stop hoisting operation, thereby not only reducing the labor intensity of workers, but also improving the construction efficiency. The small hydraulic station is arranged on the rear side of the top of the vertical frame on the rear side of the cart, and the positioning needle is pricked at the top of the polystyrene board on the last side through the coordinated operation of the pushing oil cylinder and the hooking oil cylinder, so that the position of the polystyrene board can be limited, the stability of the CL net rack board is ensured in the transportation process of the cart, and the CL net rack board is prevented from falling off the cart. In addition, the coordinated operation of the pushing oil cylinder and the hooking oil cylinder can push the CL net rack plate forwards to a vertical state when the tower crane hoists the CL net rack plate, so that the labor intensity of workers can be fully reduced, and the annular steel wire rope can be conveniently hooked. The limiting block plays a role in limiting the backward slipping when the plurality of CL net rack plates are placed on the bottom plate. Because the small hydraulic station and the pushing oil cylinder are both arranged at the top of the rear side of the cart, when the CL net rack plate is not placed on the bottom plate, in order to keep the stability of the cart, a balancing weight is specially arranged at the front side of the lower surface of the bottom plate.
According to the invention, the CL net rack plate is additionally provided with the positioning and adjusting assembly near the construction site, and the positioning and adjusting assembly is used for limiting the positions of the CL net rack plate in the wall formwork at the inner side and the wall formwork at the outer side, so that the phenomena of rib leakage, cracking and bulging caused by the bending of the CL net rack plate due to pressure difference generated at two sides of the CL net rack plate during concrete pouring are avoided. Interior concrete piece and outer concrete piece pass through the position sleeve and are connected as an organic wholely with the polyphenyl board respectively, and inside the concrete piece including the steel wire net is pre-buried in the part, and the steel wire net is pre-buried outside inside the concrete piece partially, also makes interior steel wire net, polyphenyl board and outer steel wire net fixed connection as an organic whole like this, fully strengthens CL rack board's intensity. The inner adjusting rod and the outer adjusting rod are in threaded connection in the positioning sleeve, the length can be adjusted along the axis direction, so that the CL net rack plate is suitable for walls with different thicknesses, and the application range of the CL net rack plate is widened.
According to the invention, two adjacent polystyrene boards are in plug fit with each other through the convex ribs and the convex-concave parts between the sealing and positioning grooves, and the two adjacent and connected inner steel wire meshes and the two adjacent and connected outer steel wire meshes are connected into a whole through the lapping net sheets and the iron wires, so that the connection strength between the CL net frame plates is improved, the stability is enhanced during pouring, and the heat insulation effect of the poured wall body is fully enhanced.
Because the ground or the roof after pouring is uneven, the height of the top end edge of the assembled wall body formwork is uneven, and after concrete is poured, the levelness of the top end edge of the wall body can be influenced, so that the height of the upper edge of the inner side of the wall body is deviated. Therefore, the invention is characterized in that the template leveling device is arranged at the bottom edge of the wall template, and the operation and the adjustment are carried out before the wall template is supported and fixed. The reinforcing ribs play a role in enhancing the connection strength between the fixing nuts and the channel steel, and meanwhile, the supporting strength of the channel steel is also enhanced. Because the lower end of the adjusting bolt is fixedly provided with the ball head which is rotatably connected in the supporting block, the leveling bolt can be rotated easily by using a wrench, and the leveling bolt can be kept in a vertical state no matter whether the bottom beam or the poured roof is flat or not, so that the radial stress generated among the leveling bolt, the fixing nut and the fastening nut is avoided, and the service life of the adjusting bolt is ensured. The width of supporting shoe is less than the open width in channel-section steel bottom, can make the supporting shoe stretch into the channel-section steel inside like this, improves the control range.
In conclusion, the invention has scientific principle, low labor intensity of workers, high construction efficiency, good heat preservation effect, more energy saving and environmental protection, is suitable for the construction of CL walls with different thicknesses, ensures the levelness of the upper end edge of the wall template on the inner wall of the wall, improves the construction quality, and avoids the defects of external heat preservation of the outer wall and insufficient heat preservation durability of the inner wall of the outer wall; realizing the modernization of the building industry and the factory production of building products.
Drawings
Fig. 1 is a schematic structural view of the cart in transporting CL net rack boards;
fig. 2 is a schematic view of a CL net rack plate disposed inside a wall form;
fig. 3 is a schematic view of the connection between two adjacent CL net rack plates;
FIG. 4 is a schematic structural view of a form leveling device;
fig. 5 is a sectional view a-a in fig. 4.
Detailed Description
The invention discloses a cast-in-place construction method of a CL composite concrete shear wall, which comprises the following steps,
(1) lifting the CL net rack plate: the CL rack plate is a nonstandard block, the CL composite shear wall is decomposed according to the arrangement condition of the CL composite shear wall in the construction drawing and according to a node detail drawing in the construction drawing and a related technical specification and a construction joint reservation condition, the specification, the size, the peripheral node characteristics, the number and the position of the CL rack plate are expressed in detail, and the CL rack plate is communicated with a professional manufacturer in advance through an order form to produce and supply a goods plan;
(2) placing the purchased CL net rack plate in a temporary field adjacent to a construction site;
(3) uniformly arranging a plurality of positioning and adjusting components on two side surfaces of the CL net rack plate in the leveled construction site; meanwhile, ejecting a wall form in-place control line and a CL grid plate installation control line on a construction site;
(4) the CL net rack plates provided with the positioning and adjusting assemblies are conveyed to a wall construction site by using a trolley, the CL net rack plates are sequentially hoisted into CL net rack plate installation control lines by using a tower crane and are butted, a temporary protection frame is erected by using steel pipes to temporarily position the CL net rack plates, and the temporary protection frame is fixed on a steel bar prefabricated from the foundation to the top in the shear wall;
(5) wall formworks are respectively installed on the inner side and the outer side of the CL net frame plate according to a formwork in-place control line, a formwork leveling device is arranged on the lower side edge of the wall formwork, and the leveling device is operated to level the upper edge of the wall formwork so as to ensure the levelness of the top edge of the wall surface; an operation platform is erected above the wall formwork by adopting a scaffold, the operation platform consists of a platform plate, a guardrail and a ladder, the temporary protective frame is gradually removed in the process of installing the wall formwork, so that the positioning adjusting components arranged on the inner side and the outer side of the CL net frame plate are respectively contacted with the wall formwork, and a wall penetrating bolt and a plastic sleeve are arranged at a preset position;
as shown in fig. 4 and 5, the template leveling device comprises a horizontally arranged channel steel 1, the open side of the channel steel 1 is arranged downwards, the lower surface of the channel steel 1 is fixedly connected with at least two fixing nuts 2, the fixing nuts 2 are uniformly arranged along the length direction of the channel steel 1 at intervals, round holes corresponding to the screw holes of the fixing nuts 2 up and down are formed in the channel steel 1, the inner diameter of each round hole is larger than or equal to the inner diameter of the screw hole of the fixing nut 2, a leveling bolt 3 is connected to the screw hole of the fixing nut 2 in an internal thread manner, the head of the leveling bolt 3 is positioned above the channel steel 1, and the lower end of the leveling bolt 3; the lower end edge of the wall template is supported outside the upper surface of the channel steel 1;
the hinged support comprises a ball head 4 and a supporting block 5, the width of the supporting block 5 is smaller than the width of an opening at the bottom of the channel steel 1, the bottom of the supporting block 5 is a plane, a ball head socket is arranged on the upper surface of the supporting block 5, the lower end of the leveling bolt 3 is fixedly connected with the top of the ball head 4, and the ball head 4 is rotatably connected into the ball head socket; a reinforcing rib 6 is arranged between the side part of the fixing nut 2 and the inside of the channel steel 1; the upper bolt of the leveling nut is connected with a fastening nut 7, and the lower end face of the fastening nut 7 is in top pressure contact with the upper surface of the channel steel 1;
the process of operating the template leveling device to adjust the levelness of the wall template 8 comprises the following steps: firstly, loosening the fastening nut 7 by using a wrench, then clamping the head of the leveling bolt 3 by using the wrench, screwing the leveling bolt 3, driving the channel steel 1 to move up and down by using the fixing nut 2 in threaded connection with the leveling bolt 3, driving the wall formwork 8 by using the channel steel 1 to realize height adjustment, screwing the fastening nut 7 to be in jacking contact with the channel steel 1 until the top edge of the wall formwork 8 is kept horizontal, and keeping the wall formwork 8 in seamless connection with a horizontal formwork arranged at the bottom of a roof;
(6) pouring self-sealing concrete into the cavity between the CL net frame plate 9 and the wall formwork 8 on the inner side and the cavity between the CL net frame plate 9 and the wall formwork 8 on the outer side from the top of the wall formwork 8;
as shown in fig. 2, the CL mesh frame plate 9 includes a polystyrene board 10 having a rectangular structure, an inner steel wire mesh 11 and an outer steel wire mesh 12 are respectively disposed on the inner side and the outer side of the polystyrene board 10, the inner steel wire mesh 11 and the outer steel wire mesh 12 are connected by an oblique steel bar 13 penetrating through the polystyrene board 10, a convex rib 14 is disposed on one side of the polystyrene board 10 along the vertical direction, and a sealing and positioning groove 15 is disposed on the other side of the polystyrene board 10 along the vertical direction; the cross sections of the convex ribs 14 and the sealing and positioning grooves 15 are the same in shape and size;
the positioning and adjusting assembly in the step (3) comprises an inner concrete block 16, an outer concrete block 17, a positioning sleeve 18, an inner adjusting rod 19 and an outer adjusting rod 20, wherein the outer side of the inner concrete block 16 is contacted with the inner side surface of the polystyrene board 10, the inner side of the outer concrete block 17 is contacted with the outer side surface of the polystyrene board 10, the positioning sleeve 18 penetrates through the polystyrene board 10 along the inner and outer horizontal directions, the inner end part of the positioning sleeve 18 is embedded in the inner concrete block 16, the outer end part of the positioning sleeve 18 is embedded in the outer concrete block 17, the part of the inner steel wire mesh 11, which is contacted with the inner concrete block 16, is embedded in the inner concrete block 16, the part of the outer steel wire mesh 12, which is contacted with the outer concrete block 17, is embedded in the outer concrete block 17, the outer end part of the inner adjusting rod 19 extends into and is in the inner port of the positioning sleeve 18 in a threaded manner, the inner end part of the outer adjusting, an inner limiting plate 21 is fixedly arranged at the inner end of the inner adjusting rod 19, and an outer limiting plate 22 is fixedly arranged at the outer end of the outer adjusting rod 20;
the specific manufacturing and installation process for setting the positioning and adjusting assembly in the step (3) is as follows: firstly, horizontally placing a CL net rack plate 9 in a field, enabling the inner side of a polyphenyl plate 10 to face upwards, uniformly forming a plurality of through holes in the polyphenyl plate 10, enabling a positioning sleeve 18 to penetrate through the through holes, enabling the length of the positioning sleeve 18 to be slightly larger than the distance between an inner steel wire mesh 11 and an outer steel wire mesh 12, enabling the lower end of the positioning sleeve 18 to be in contact with the ground, coaxially sleeving a mould which is in a circular truncated cone shape and is provided with two through ends outside the positioning sleeve 18, enabling the edge of the upper end of the mould to be flush with the positioning sleeve 18, enabling the edge of the lower end of the mould to be in contact with the polyphenyl plate 10, forming through seams for penetrating the steel wire mesh on the mould, adding concrete into the mould and tamping, scraping off redundant concrete, leveling the top surface of the concrete in the; inserting positioning sleeves 18 into other through holes on the polystyrene board 10 in sequence according to the operation process and manufacturing an inner concrete block 16; after the inner concrete block 16 is completely manufactured, watering and curing the inner concrete block 16, turning up the polystyrene board 10 at least two days later, and manufacturing the outer concrete module according to the manufacturing process of the inner concrete module; after the outer concrete 17 module is watered and cured, the outer end part of the inner adjusting rod 19 extends into and is in threaded connection with the inner port of the positioning sleeve 18, and the inner end part of the outer adjusting rod 20 extends into and is in threaded connection with the outer port of the positioning sleeve 18. The outer concrete block 17 is in a circular truncated cone structure with a thick inner part and a thin outer part, and the inner concrete block 16 is in a circular truncated cone structure with a thick outer part and a thin inner part, so that the demoulding of the mould is convenient.
As shown in fig. 1, the cart in step (4) includes a bottom plate 23, universal wheels 24 having a locking mechanism are provided on the bottom surface of the bottom plate 23, a vertical frame 25 is fixedly provided on the rear side of the upper surface of the bottom plate 23, the front side of the vertical frame 25 is inclined from front to back, handrails 26 are provided on the left and right sides of the rear middle portion of the vertical frame 25, a support frame 27 is provided on the upper portion of the rear side of the vertical frame 25, a small hydraulic station 28 is provided on the support frame 27, a push cylinder 29 is fixedly provided on the top of the small hydraulic station 28 along the front-back horizontal direction, a hook cylinder 30 is fixedly provided on the front end of the piston rod of the push cylinder 29 along the vertical direction, a positioning pin 31 is provided on the lower end of the piston rod of the hook cylinder 30, the push cylinder 29 and the hook cylinder 30 are both connected to the small hydraulic station 28 through a high pressure oil pipe, an operation panel 32 of the small hydraulic station 28, a balancing weight 34 is arranged on the front side of the lower surface of the bottom plate 23;
the process of conveying the CL net rack plate 9 provided with the positioning and adjusting assembly to the wall construction site by the cart in the step (4) comprises the following steps: placing a plurality of CL net frame plates 9 on a bottom plate 23 side by side, enabling one CL net frame plate 9 on the last side to lean against a vertical frame 25 in an inclined mode, enabling other CL net frame plates 9 to lean against adjacent CL net frame plates 9 on the rear side in sequence, operating an operation panel 32, pushing a piston rod of an oil cylinder 29 to extend forwards to the position right above the foremost CL net frame plate 9 to stop, enabling a piston rod of a hook oil cylinder 30 to extend downwards, enabling a positioning nail 31 to be pricked into the upper end face of a polystyrene board 10, and enabling a worker to hold an armrest 26 to push a cart to convey the CL net frame plates 9 to a wall construction site; two annular steel wire ropes are connected to a lifting hook of the tower crane, a piston rod of a pushing cylinder 29 is controlled to extend firstly, the upper part of a CL net frame plate 9 at the forefront side is pushed to move forwards to a vertical state through a hooking cylinder 30 and a positioning nail 31, one annular steel wire rope is hung on two inner concrete blocks 16 or outer concrete blocks 17 at the same height at the front side of the CL net frame plate 9, a worker holds the CL net frame plate 9 at the vertical state firstly, then the piston rod of the hooking cylinder 30 is controlled to retract upwards, a positioning needle is separated from a polyphenyl plate 10, the piston rod of the pushing cylinder 29 is controlled to move backwards to the upper part of the next polyphenyl plate 10, the piston rod of the hooking cylinder 30 extends downwards, the positioning nail 31 is pricked into the polyphenyl plate 10, then the other annular steel wire rope is hung on two outer concrete blocks 17 or inner concrete blocks 16 at the rear side of the CL net frame plate 9, the outer concrete blocks 17 and the inner concrete blocks 16 hung by the two annular steel wire ropes, finally, starting the tower crane, and hoisting the CL net frame plate 9 to the designated position of the CL net frame plate 9 for installing the control line; sequentially hoisting all CL net rack plates 9 on the cart in place according to the process; in the tower crane operation process, the other cart is provided with the CL net frame plate 9 and pushed to a construction site, the two carts transport the CL net frame plate 9 in turn, and the tower crane does not stop hoisting the CL net frame plate 9 in place; in the process of hoisting the CL rack plate 9 in place, the two adjacent polystyrene boards 10 are matched with the sealing positioning groove 15 through the convex ribs 14 to achieve the effect of positioning and sealing, and meanwhile, the two adjacent and connected inner steel wire nets 11 and the two adjacent and connected outer steel wire nets 12 are connected into a whole through the lapping net piece 35 and the iron wires, and the inner steel wire nets are also connected with the steel bars prefabricated in the shear wall body. As shown in fig. 3.
In the step (5), before the wall formwork 8 is installed, a release agent is coated on the inner wall of the wall formwork 8, the inner limiting plate 21 and the outer limiting plate 22 are rotated in advance according to the thickness of the wall, the inner adjusting rod 19 rotates in the positioning sleeve 18 and moves inwards, the outer adjusting rod 20 rotates in the positioning sleeve 18 and moves outwards until the distance between the inner limiting plate 21 and the outer limiting plate 22 is equal to the thickness of the wall and stops, after the wall formwork 8 is installed, the inner wall formwork 8 is in contact with the inner limiting plate 21, and the outer wall formwork 8 is in contact with the outer limiting plate 22.
In the step (6), because the inner steel wire mesh 11 and the outer steel wire mesh 12 are dense, the distance between the outer side of the polystyrene board 10 and the wall formwork 8 is small, and the self-compacting concrete with the designed strength grade is adopted, and the self-compacting concrete can achieve the following working performance: within 5 seconds, the slump is 260-280 mm, the expansion degree is 600-750 mm, the workability is good, and no visual bleeding or segregation phenomenon exists;
the material of the self-compacting concrete should meet the following requirements:
cementing materials: cement; the cement adopts 42.5 silicate, ordinary silicate cement and slag silicate cement;
coarse aggregate: stones; the stones are continuous graded pebbles or gravels with the grain diameter of 5-10 mm;
fine aggregate: sand; the sand is medium sand with a larger fineness modulus which is more than or equal to 2.6;
water: clean drinking water is adopted;
blending materials: fly ash I and fly ash II or ground slag and a small amount of expanding agent are added into self-sealing concrete, the admixture is well prepared before use, and the fly ash with small water ratio is used as much as possible;
additive: the common water reducing agent can not reach the water reducing degree and the improved workability required by high-performance concrete, and a superplasticizer or a high-efficiency water reducing agent is generally required to be added; the naphthalene-based superplasticizers of different manufacturers are compounded and used according to a proportion, the interaction among the components of the blended product is mutually adjusted, the respective advantages are exerted, and the super-superposition effect is obtained; besides the water reducing agent, an air entraining agent, an early strength agent or a retarder and a pumping aid are added in a proper amount according to the actual engineering situation.
The concrete process of pouring the self-sealing concrete in the step (6) is as follows: when the self-sealing concrete is pumped, a funnel or a baffle is arranged at the upper opening of the wall formwork 8 after the self-sealing concrete falls from the opening of the delivery pipe, so that the concrete enters the formwork at a slow speed, the height difference h of the liquid level of the self-sealing concrete generated by different resistances and flow rates of the self-sealing concrete at two sides of the polystyrene board 10 at any section in the wall formwork 8 is not more than 400 mm, namely the size of the self-sealing concrete slurry level at the outer side higher than that at the inner side is controlled within 400 mm; in the process of pouring the self-sealing concrete, a specially-assigned person is arranged to observe the liquid level height of the concrete of each section, the liquid level height can be measured through flashlight irradiation and inserted rod during observation, and when the liquid level height difference of the self-sealing concrete at a certain section is close to 400 mm, the self-sealing concrete is poured at the point immediately.
In order to control the flow rate of the self-sealing concrete on the inner side and the outer side of the CL net frame plate 9, in the pouring process of the self-sealing concrete, a steel pipe for a scaffold is vertically inserted into the thicker side to control the section, a hook is welded on the steel pipe so as to be convenient to draw out, and the inner limiting plate 21 and the outer limiting plate 22 play a role of limiting the polystyrene board 10 to keep a vertical state when the polystyrene board is stressed by the self-sealing concrete; the mold-entering temperature of the self-sealing concrete is controlled to be 5-35 ℃, and the self-sealing concrete pouring point is arranged at the intersection part of the cross-shaped, T-shaped or L-shaped wall body so as to facilitate the uniform flow of the self-sealing concrete; the same pouring point is preferably used for the push type continuous pouring, and when the pouring points are switched, the next layer of self-sealing concrete is poured before the initial setting of the self-sealing concrete of the front layer.
In order to achieve the purpose of smooth surface when the self-sealing concrete is poured in the step (6), the wall formwork 8 is vibrated in an auxiliary mode in which a leather hammer, a small flat vibrator or a vibrating rod vibrates from bottom to top along with the pouring of the self-sealing concrete; when the hidden column with a complex steel bar structure or the middle part of the composite shear wall is poured, a small vibrating rod is adopted for proper inserting and tamping, and the inclined inserted steel bars 13 of the CL net rack plate 9 cannot be touched during inserting and tamping.
When the wall formwork 8 is in place in the step (5), mortar is paved on the lower part of the wall formwork 8 or mortar joints are hooked after the wall formwork is in place, so that mortar return on the lower part of the wall formwork 8 is prevented;
fixing and additionally arranging steel plate corner protectors on the wall body template 8 frame of the door and window opening by using wood screws, and adopting thickened frames and increased diagonal supports to ensure the integral rigidity of the door and window frame and prevent the corners from deforming and leaking slurry;
sealing the splicing seams of all the wall formworks 8 by adopting a sponge sealing strip pressing measure; auxiliary measures of sticking plastic adhesive tapes or applying sealant can be adopted at local parts as necessary, so that the leakage of cement mortar is practically avoided.
Air vents are reserved at internal corners or other dead corners of the opening, the self-sealing concrete is timely observed during pouring, and the self-sealing concrete is immediately plugged after being filled to prevent mortar from losing.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (8)

  1. The field pouring construction method of the CL composite concrete shear wall is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
    (1) lifting the CL net rack plate: the CL rack plate is a nonstandard block, the CL composite shear wall is decomposed according to the arrangement condition of the CL composite shear wall in the construction drawing and according to a node detail drawing in the construction drawing and a related technical specification and a construction joint reservation condition, the specification, the size, the peripheral node characteristics, the number and the position of the CL rack plate are expressed in detail, and the CL rack plate is communicated with a professional manufacturer in advance through an order form to produce and supply a goods plan;
    (2) placing the purchased CL net rack plate in a temporary field adjacent to a construction site;
    (3) uniformly arranging a plurality of positioning and adjusting components on two side surfaces of the CL net rack plate in the leveled construction site; meanwhile, ejecting a wall form in-place control line and a CL grid plate installation control line on a construction site;
    (4) the CL net rack plates provided with the positioning and adjusting assemblies are conveyed to a wall construction site by using a trolley, the CL net rack plates are sequentially hoisted into CL net rack plate installation control lines by using a tower crane and are butted, a temporary protection frame is erected by using steel pipes to temporarily position the CL net rack plates, and the temporary protection frame is fixed on a steel bar prefabricated from the foundation to the top in the shear wall;
    (5) wall formworks are respectively installed on the inner side and the outer side of the CL net frame plate according to a formwork in-place control line, a formwork leveling device is arranged on the lower side edge of the wall formwork, and the leveling device is operated to level the upper edge of the wall formwork so as to ensure the levelness of the top edge of the wall surface; an operation platform is erected above the wall formwork by adopting a scaffold, the operation platform consists of a platform plate, a guardrail and a ladder, the temporary protective frame is gradually removed in the process of installing the wall formwork, so that the positioning adjusting components arranged on the inner side and the outer side of the CL net frame plate are respectively contacted with the wall formwork, and a wall penetrating bolt and a plastic sleeve are arranged at a preset position;
    the template leveling device comprises a horizontally arranged channel steel, the open side of the channel steel is downwards arranged, the lower surface of the channel steel is fixedly connected with at least two fixing nuts, the fixing nuts are uniformly arranged at intervals along the length direction of the channel steel, round holes corresponding to the screw holes of the fixing nuts are formed in the channel steel up and down, the inner diameter of each round hole is larger than or equal to the inner diameter of each screw hole of each fixing nut, a leveling bolt is connected to the screw hole of each fixing nut in a threaded manner, the head of each leveling bolt is positioned above the channel steel, and the lower end of each leveling bolt is; the lower end edge of the wall template is supported outside the upper surface of the channel steel;
    the hinged support comprises a ball head and a supporting block, the width of the supporting block is smaller than the width of an opening at the bottom of the channel steel, the bottom of the supporting block is a plane, a ball head socket is arranged on the upper surface of the supporting block, the lower end of the leveling bolt is fixedly connected with the top of the ball head, and the ball head is rotatably connected in the ball head socket; a reinforcing rib is arranged between the side part of the fixed nut and the inside of the channel steel; the upper bolt of the leveling nut is connected with a fastening nut, and the lower end surface of the fastening nut is in top pressure contact with the upper surface of the channel steel;
    the process of operating the template leveling device to adjust the levelness of the wall template comprises the following steps: firstly, loosening the fastening nut by using a wrench, then clamping the head of the leveling bolt by using the wrench, screwing the leveling bolt, driving the channel steel to move up and down by using the fixing nut in threaded connection with the leveling bolt, driving the wall body template to realize height adjustment by using the channel steel, and screwing the fastening nut to be in jacking contact with the channel steel after the top edge of the wall body template is kept horizontal, wherein the wall body template is in seamless connection with a horizontal template arranged at the bottom of a roof;
    (6) pouring self-sealing concrete into the cavity between the CL net frame plate and the wall formwork at the inner side and the cavity between the CL net frame plate and the wall formwork at the outer side from the top of the wall formwork;
    the CL rack plate comprises a polystyrene board with a rectangular structure, an inner steel wire mesh and an outer steel wire mesh are respectively arranged on the inner side and the outer side of the polystyrene board and are connected through oblique inserted steel bars penetrating through the polystyrene board, a convex rib is arranged on one side edge of the polystyrene board in the vertical direction, and a sealing positioning groove is formed in the other side edge of the polystyrene board in the vertical direction; the cross sections of the convex edge strips and the sealing positioning grooves are the same in shape and size;
    the positioning and adjusting component in the step (3) comprises an inner concrete block and an outer concrete block, the outer side of the inner concrete block is in contact with the inner side face of the polyphenyl plate, the inner side of the outer concrete block is in contact with the outer side face of the polyphenyl plate, the positioning sleeve penetrates through the polyphenyl plate along the inner horizontal direction and the outer horizontal direction, the inner end portion of the positioning sleeve is embedded in the inner concrete block, the outer end portion of the positioning sleeve is embedded in the outer concrete block, the portion, in contact with the inner concrete block, of an inner steel wire mesh is embedded in the inner concrete block, the portion, in contact with the outer concrete block, of the outer steel wire mesh is embedded in the outer concrete block, the outer end portion of the inner adjusting rod extends into and is in threaded connection with the inner port of the positioning sleeve, the inner end portion of the outer adjusting rod extends into and is in threaded connection with the outer port of the positioning sleeve, an inner limiting plate is fixedly arranged at the inner end of the inner adjusting rod; the outer concrete block is in a circular truncated cone-shaped structure with thick inside and thin outside, and the inner concrete block is in a circular truncated cone-shaped structure with thick outside and thin inside;
    the specific manufacturing and installation process for setting the positioning and adjusting assembly in the step (3) is as follows: firstly, horizontally placing a CL net rack plate in a field, enabling the inner side of a polyphenyl plate to face upwards, uniformly forming a plurality of through holes in the polyphenyl plate, enabling a positioning sleeve to penetrate through the through holes, enabling the length of the positioning sleeve to be slightly larger than the distance between an inner steel wire mesh and an outer steel wire mesh, enabling the lower end of the positioning sleeve to be in contact with the ground, coaxially sleeving a mould which is in a circular truncated cone shape and is provided with two through ends, outside the positioning sleeve, enabling the edge of the upper end of the mould to be flush with the positioning sleeve, enabling the edge of the lower end of the mould to be in contact with the polyphenyl plate, forming a through seam for penetrating through the steel wire mesh on the mould, adding concrete into the mould, tamping, scraping off redundant concrete, leveling the top surface of; inserting positioning sleeves into other through holes on the polystyrene board in sequence according to the operation process and manufacturing an inner concrete block; after the inner concrete blocks are completely manufactured, watering and curing the inner concrete blocks, turning up the polystyrene board after at least two days, and manufacturing the outer concrete module according to the manufacturing process of the inner concrete module; after the outer concrete module is watered and maintained, the outer end part of the inner adjusting rod extends into and is in threaded connection with the inner port of the positioning sleeve, and the inner end part of the outer adjusting rod extends into and is in threaded connection with the outer port of the positioning sleeve.
  2. 2. The CL composite concrete shear wall cast-in-place construction method according to claim 1, characterized in that: the cart in the step (4) comprises a bottom plate, universal wheels with locking mechanisms are arranged on the bottom surface of the bottom plate, a vertical frame is fixedly arranged on the rear side of the upper surface of the bottom plate, the front side of the vertical frame is arranged in a manner that the front side is low in front and high in back, handrails are arranged on the left side and the right side of the middle part of the rear side of the vertical frame, a support frame is arranged on the upper part of the rear side of the vertical frame, a small hydraulic station is arranged on the support frame, a pushing oil cylinder is fixedly arranged at the top of the small hydraulic station along the front-back horizontal direction, a hooking oil cylinder is fixedly arranged at the front end of a piston rod of the pushing oil cylinder along the vertical direction, a positioning nail is arranged at the lower end of the piston rod of the hooking oil cylinder, the pushing oil cylinder and the hooking oil cylinder are both connected with the small hydraulic station;
    the process that the cart in the step (4) conveys the CL net rack plate provided with the positioning and adjusting assembly to a wall construction site comprises the following steps: placing a plurality of CL net frame plates on a bottom plate side by side, enabling a CL net frame plate on the last side to lean against a vertical frame in an inclined mode, enabling other CL net frame plates to lean against adjacent CL net frame plates on the back side in sequence, operating an operation panel, pushing a piston rod of an oil cylinder to extend forwards to a position right above the CL net frame plate on the foremost side to stop, enabling a piston rod of a hook oil cylinder to extend downwards, positioning and pinning the piston rod inside the upper end face of a polystyrene board, and enabling a worker to hold an armrest to push a cart to convey the CL net frame plates to a wall construction site; two annular steel wire ropes are connected to a lifting hook of the tower crane, a piston rod of a pushing oil cylinder is controlled to extend firstly, the upper part of a CL net frame plate at the foremost side is pushed to move forwards to a vertical state through a hooking oil cylinder and a positioning nail, one annular steel wire rope is hung on two inner concrete blocks or outer concrete blocks at the same height at the front side of the CL net frame plate, a worker holds the CL net frame plate in the vertical state firstly, then the piston rod of the hooking oil cylinder is controlled to retract upwards, a positioning needle is separated from the polystyrene plate, the piston rod of the pushing oil cylinder is controlled to move backwards to the upper side of the next polystyrene plate, the piston rod of the hooking oil cylinder extends downwards, the positioning nail is fixed into the polystyrene plate, then the other annular steel wire rope is hung on the two outer concrete blocks or inner concrete blocks at the rear side of the CL net frame plate, the outer concrete blocks and the inner concrete blocks hung by the two annular steel wire, hoisting the CL rack plate to the specified position of the CL rack plate installation control line; sequentially hoisting all CL net rack plates on the cart in place according to the process; in the tower crane operation process, the other cart is provided with the CL net frame plate and pushed to a construction site, the two carts transport the CL net frame plate in turn, and the tower crane does not stop hoisting the CL net frame plate in place; in the process of hoisting the CL rack plate in place, the two adjacent polystyrene boards are matched with the sealing positioning groove through the convex ribs to achieve the effect of positioning and sealing, and meanwhile, the two adjacent and connected inner steel wire meshes and the two adjacent and connected outer steel wire meshes are connected into a whole by using the lapping net sheets and the iron wires, and the inner steel wire meshes are also connected with the steel bars prefabricated in the shear wall body.
  3. 3. The CL composite concrete shear wall cast-in-place construction method according to claim 1, characterized in that: before the wall body formwork is installed in the step (5), a release agent is coated on the inner wall of the wall body formwork, the inner limiting plate and the outer limiting plate are rotated in advance according to the thickness of the wall body, the inner adjusting rod moves inwards while rotating in the positioning sleeve, the outer adjusting rod moves outwards while rotating in the positioning sleeve until the distance between the inner limiting plate and the outer limiting plate is equal to the thickness of the wall body, and then the wall body formwork on the inner side is in contact with the inner limiting plate and the wall body formwork on the outer side is in contact with the outer limiting plate.
  4. 4. The CL composite concrete shear wall cast-in-place construction method according to claim 1, characterized in that: in the step (6), because the inner steel wire mesh and the outer steel wire mesh are dense, the distance between the outer side of the polystyrene board and the wall body template is small, and the self-compacting concrete with the designed strength grade is adopted, and the self-compacting concrete can reach the following working performance: within 5 seconds, the slump is 260-280 mm, the expansion degree is 600-750 mm, the workability is good, and no visual bleeding or segregation phenomenon exists;
    the material of the self-compacting concrete should meet the following requirements:
    cementing materials: cement; the cement adopts 42.5 silicate, ordinary silicate cement and slag silicate cement;
    coarse aggregate: stones; the stones are continuous graded pebbles or gravels with the grain diameter of 5-10 mm;
    fine aggregate: sand; the sand is medium sand with a larger fineness modulus which is more than or equal to 2.6;
    water: clean drinking water is adopted;
    blending materials: fly ash I and fly ash II or ground slag and a small amount of expanding agent are added into self-sealing concrete, the admixture is well prepared before use, and the fly ash with small water ratio is used as much as possible;
    additive: the common water reducing agent can not reach the water reducing degree and the improved workability required by high-performance concrete, and a superplasticizer or a high-efficiency water reducing agent is generally required to be added; the naphthalene-based superplasticizers of different manufacturers are compounded and used according to a proportion, the interaction among the components of the blended product is mutually adjusted, the respective advantages are exerted, and the super-superposition effect is obtained; besides the water reducing agent, an air entraining agent, an early strength agent or a retarder and a pumping aid are added in a proper amount according to the actual engineering situation.
  5. 5. The CL composite concrete shear wall cast-in-place construction method according to claim 4, characterized in that: the concrete process of pouring the self-sealing concrete in the step (6) is as follows: when the self-sealing concrete is pumped, a funnel or a baffle is arranged at the upper opening of the wall body template after the self-sealing concrete falls from the opening of the delivery pipe, so that the concrete enters a mold at a slow speed, the height difference h of the liquid level of the self-sealing concrete generated by different resistance and flow rates of the self-sealing concrete at any section in the wall body template at two sides of the polystyrene board is not more than 400 mm, namely the size of the self-sealing concrete slurry level at the outer side higher than the self-sealing concrete slurry level at the inner side is controlled within 400 mm; in the process of pouring the self-sealing concrete, a specially-assigned person is arranged to observe the liquid level height of the concrete of each section, the liquid level height can be measured through flashlight irradiation and inserted rod during observation, and when the liquid level height difference of the self-sealing concrete at a certain section is close to 400 mm, the self-sealing concrete is poured at the point immediately.
  6. 6. The CL composite concrete shear wall cast-in-place construction method according to claim 5, characterized in that: in order to control the flow rate of self-sealing concrete on the inner side and the outer side of the CL net frame plate, a steel pipe for a scaffold is vertically inserted into the thicker side to control the section in the pouring process of the self-sealing concrete, a hook is welded on the steel pipe so as to be conveniently drawn out, and the inner limiting plate and the outer limiting plate play a role of limiting the polystyrene board to keep a vertical state when the polystyrene board is subjected to the pressure of the self-sealing concrete; the mold-entering temperature of the self-sealing concrete is controlled to be 5-35 ℃, and the self-sealing concrete pouring point is arranged at the intersection part of the cross-shaped, T-shaped or L-shaped wall body so as to facilitate the uniform flow of the self-sealing concrete; the same pouring point is preferably used for the push type continuous pouring, and when the pouring points are switched, the next layer of self-sealing concrete is poured before the initial setting of the self-sealing concrete of the front layer.
  7. 7. The CL composite concrete shear wall cast-in-place construction method according to claim 5, characterized in that: in the step (6), in order to achieve the purpose of smooth surface when the self-sealing concrete is poured, auxiliary vibration is carried out outside the wall formwork, and a leather hammer, a small flat vibrator or a vibrating rod vibrates from bottom to top along with the pouring of the self-sealing concrete in an auxiliary vibration mode; when the hidden column with a complex steel bar structure or the middle part of the composite shear wall is poured, a small vibrating rod is adopted for proper inserting and tamping, and the obliquely inserted steel bars of the CL net rack plate cannot be touched during inserting and tamping.
  8. 8. The CL composite concrete shear wall cast-in-place construction method according to claim 7, characterized in that: when the wall body formwork is in place in the step (5), mortar is paved on the lower part of the wall body formwork or mortar joints are hooked after the wall body formwork is in place, so that mortar return on the lower part of the wall body formwork is prevented;
    the wall template frame of the door and window opening is fixedly provided with steel plate corner protectors by wood screws, and the overall rigidity of the door and window frame is ensured and the corners are prevented from deforming and leaking slurry by adopting thickened frames and increased diagonal supports;
    sealing the splicing seams of all the wall formworks by adopting a sponge sealing strip pressing measure; auxiliary measures of sticking plastic adhesive tapes or applying sealant can be adopted at local parts as necessary, so that the leakage of cement mortar is practically avoided;
    air vents are reserved at internal corners or other dead corners of the opening, the self-sealing concrete is timely observed during pouring, and the self-sealing concrete is immediately plugged after being filled to prevent mortar from losing.
CN201810260251.1A 2018-03-27 2018-03-27 CL composite concrete shear wall cast-in-place construction method Expired - Fee Related CN108505645B (en)

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