CN113374254A - Construction method for improving forming quality of junction of new and old cast-in-place concrete walls - Google Patents
Construction method for improving forming quality of junction of new and old cast-in-place concrete walls Download PDFInfo
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- CN113374254A CN113374254A CN202110720361.3A CN202110720361A CN113374254A CN 113374254 A CN113374254 A CN 113374254A CN 202110720361 A CN202110720361 A CN 202110720361A CN 113374254 A CN113374254 A CN 113374254A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/005—Strips for covering joints between form sections, e.g. to avoid burring or spilling of laitance
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/06—Tying means; Spacers ; Devices for extracting or inserting wall ties
- E04G17/065—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/06—Tying means; Spacers ; Devices for extracting or inserting wall ties
- E04G17/065—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning
- E04G17/0651—One-piece elements
- E04G17/0652—One-piece elements fully recoverable
Abstract
The invention discloses a construction method for improving the forming quality of a cast-in-place concrete new and old wall junction, which comprises the steps of firstly supporting a lower-layer wall body wall template, completing the concrete pouring of the lower-layer wall body, and removing the wall template positioned at the top of the lower-layer wall body after solidification forming to expose the top of the lower-layer wall body; the forming control template comprises a rigid back plate, wherein the lower side edge of the rigid back plate is outwards bent to form a lower folded edge and abutted against the top of a lower-layer wall body wall template, the lower folded edge is bent to form a lower protective edge abutted against the outer side surface of the lower-layer wall body wall template, the lower folded edge compresses the wall template on a lower-layer wall body through a lower opposite pull rod, an upper-layer wall body wall template is installed and placed at the upper folded edge and abutted against the upper protective edge, and the upper protective edge supports the wall template through the upper opposite pull rod. The invention has simple and convenient construction, better sealing performance for concrete pouring at the junction of the new wall and the old wall, avoids the occurrence of mold explosion and improves the concrete molding quality.
Description
Technical Field
The invention relates to the field of wall concrete pouring, in particular to a construction method for improving the forming quality of a junction of a new wall and an old wall of cast-in-place concrete.
Background
In the concrete wall construction, the construction is carried out up and down in sections according to the construction height and the construction difficulty, after the construction of the lower wall is finished, the upper wall steel bars are bound, and the concrete pouring is carried out after the support of the upper wall formwork is finished. When pouring upper wall body concrete, because the wall form of upper wall body bottom is installed in the top position of lower floor's wall body, when the installation, if fixed insecure, the later stage just appears exploding the mould phenomenon easily then, influences the shaping quality that the wall body was pour.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a concrete new and old wall junction forming construction method which is convenient to construct and can improve the wall body pouring forming quality.
In order to solve the technical problems, the invention adopts the following technical scheme:
a construction method for improving the forming quality of a junction of a new wall and an old wall of cast-in-place concrete comprises the following steps:
(1) supporting a wall template of the lower-layer wall body, completing concrete pouring of the lower-layer wall body, and removing the wall template positioned at the top of the lower-layer wall body after the concrete of the lower-layer wall body is solidified and formed, so that the top of the lower-layer wall body is exposed;
(2) the method comprises the steps of obtaining a forming control template for the junction of a cast-in-place concrete new wall and an old wall, wherein the forming control template comprises a rectangular rigid back plate, a lower side edge of the rigid back plate is outwards bent to form a lower folding edge, a plane where the lower folding edge is located is perpendicular to a plane where the rigid back plate is located, a side edge, far away from the rigid back plate, of the lower folding edge is downwards bent to form a lower protective edge, the plane where the lower protective edge is located is parallel to the plane where the rigid back plate is located, an upper folding edge is outwards bent to form an upper folding edge, a plane where the upper folding edge is located is perpendicular to the plane where the rigid back plate is located, a side edge, far away from the rigid back plate, of the upper protective edge is upwards bent to form an upper protective edge, a plane where the upper protective edge is located is parallel to the plane where the rigid back plate is located, the distance between the inner side surface of the rigid back plate and the inner side surface of the upper protective edge and the inner side surface of the lower protective edge is respectively consistent with the thickness of a wall template, and a plurality of perforations are respectively arranged along the length direction of the side edge of the rigid back plate at the side where the upper protective edge and the lower protective edge are evenly spaced;
(3) installing a cast-in-place concrete new and old wall junction forming control template on the inner side and the outer side of the top of a lower wall body respectively, when the cast-in-place concrete new and old wall junction forming control template is installed, abutting the inner side surface of a rigid back plate on the side where the rigid back plate is located and the side surface of the exposed lower wall body, abutting the bottom surface of a lower folded edge of the rigid back plate on the top of an adjacent wall template below, abutting the inner side surface of a lower protective edge of the rigid back plate on the outer side surface of a lower wall body middle wall template abutted with the lower folded edge, positioning an upper folded edge of the rigid back plate above the top of the lower wall body, installing the cast-in-place concrete new and old wall junction forming control templates located on the inner side and the outer side of the top of the lower wall body, enabling through holes on the two lower protective edges located on the inner side and the outer side of the lower wall body to be arranged oppositely, and drilling lower through holes with the same central line as the through holes on the wall template between the two opposite through holes and the lower wall body, installing a lower opposite stay bar, wherein two ends of the lower opposite stay bar respectively penetrate out of the lower protective edges at two sides, screwing a lower pressing nut in threaded fit with the lower opposite stay bar on a bar body of the lower opposite stay bar positioned outside the lower protective edges, pressing a wall template of a lower-layer wall body corresponding to the lower protective edges on the lower-layer wall body through the lower pressing nut, and then removing the wall templates of the other lower-layer wall bodies;
(4) after all cast-in-place concrete new and old wall junction forming control templates are installed, binding upper wall body steel bars above a lower wall body, installing wall templates of an upper wall body adjacent to the cast-in-place concrete new and old wall junction forming control templates on the top of the cast-in-place concrete new and old wall junction forming control templates, arranging the bottom of the wall templates of the upper wall body on the top surface of an upper folded edge, leveling the inner side surface of the wall templates of the upper wall body with the inner side surface of a rigid back plate to enable the outer side surface of the bottom of the wall templates of the upper wall body to be abutted against the inner side surface of the upper protective edge, drilling upper through holes with the same center line as the through holes at positions corresponding to the through holes on the upper protective edge at the bottom of the wall templates of the upper wall body, installing diagonal rods, respectively penetrating the two ends of the upper diagonal rods outside the upper protective edges at the two sides, screwing upper diagonal rods on rods outside the upper protective edges to be abutted against nuts in threaded fit with the upper diagonal rods, the upper abutting nut abuts against the outer side face of the upper protective edge, the inner side face of the upper protective edge abuts against the outer side face of the upper-layer wall body middle wall formwork in abutting connection with the upper folded edge, the wall formwork of the upper-layer wall body adjacent to the upper side of the rigid back plate is supported, then the wall formworks of the other upper-layer wall bodies are installed and supported simultaneously, upper-layer wall body concrete is poured, and the upper-layer wall body concrete is solidified and molded.
In the invention, the upper and lower side edges of the rigid back plate respectively form an upper folded edge, an upper protective edge, a lower folded edge and a lower protective edge, and the distance between the inner side surface of the upper protective edge and the inner side surface of the lower protective edge to the inner side surface of the rigid back plate is consistent with the thickness of the wall formwork, so that when the rigid back plate is installed, the lower folded edge abuts against the top of the wall formwork of the lower wall body, and simultaneously, when the lower protective edge abuts against the outer side surface of the wall formwork of the lower wall body, the inner side surface of the rigid back plate not only abuts against the side surface of the lower wall body, but also ensures that the inner side surface of the rigid back plate is flush with the inner side surface of the wall formwork of the lower wall body; in addition, the lower folded edge and the lower protective edge which are formed after bending and the opposite tension rod on the lower protective edge can be firmly fixed, and meanwhile, the wall template of the lower-layer wall body can be clamped on the lower-layer wall body, so that the mold explosion condition is effectively prevented. The wall form installation of upper wall body, the butt is on last hem, and the butt retrains on last safe edge medial surface simultaneously, and the effectual shaping quality of pouring that has improved.
Preferably, the rigid back plate comprises an upper folded plate and a lower folded plate which are rectangular, the upper folded edge is positioned at the upper side edge of the upper folded plate, the lower folded edge is positioned at the lower side edge of the lower folded plate, the lower side edge of the upper folded plate is opposite to and hinged with the upper side edge of the lower folded plate, the outer side surface of the upper folded plate and the outer side surface of the lower folded plate are respectively provided with a plurality of shaping seats which are uniformly spaced and oppositely arranged along the length direction parallel to the hinged edges of the upper folded plate, the bottom surface of each shaping seat is concavely provided with a through groove, a shaping mounting hole is formed between each through groove and the corresponding upper folded plate or lower folded plate, when the upper folded plate and the lower folded plate rotate to the inner side surfaces thereof are positioned on the same plane, the shaping holes positioned on the upper folded plate are opposite to the corresponding shaping holes positioned on the lower folded plate, a shaping support rod is arranged between the two corresponding shaping holes, and two ends of the shaping support rod respectively penetrate through the two corresponding shaping holes, the shaping support rods are respectively abutted against the outer side surfaces of the upper folding plate and the lower folding plate, one side of the shaping base, which is opposite to the corresponding upper folding plate or lower folding plate, is provided with a shaping screw hole communicated with the shaping mounting hole, the central line direction of the shaping screw hole is vertical to the plane of the corresponding upper folding plate or lower folding plate, a shaping bolt is arranged on the shaping base, a screw section of the shaping bolt penetrates through the corresponding shaping screw hole and extends into the shaping mounting hole, the shaping bolt is in threaded fit with the shaping screw hole, and one end of the shaping bolt, which extends into the shaping mounting hole, is abutted against the corresponding shaping support rods so that the shaping support rods are respectively abutted against the upper folding plate and the lower folding plate;
after all the cast-in-place concrete new and old wall junction forming control templates are installed, the upper folding plates are respectively rotated outwards, then upper layer wall body steel bars are bound, after the upper layer wall body steel bars are bound, the upper folding plates are rotated, the inner side surfaces of the upper folding plates and the inner side surfaces of the lower folding plates are located on the same plane, the shaping support rods penetrate through the two corresponding shaping holes, the shaping support rods are respectively abutted to the outer side surfaces of the upper folding plates and the lower folding plates, and then the shaping bolts located at two ends of the shaping support rods are respectively screwed, so that the shaping bolts are abutted to the shaping support rods. The upper folded plate is turned outwards, so that the steel bars can be conveniently bound.
As optimization, the design vaulting pole towards in seted up on one side of design screw along design vaulting pole central line direction by the spacing spout that the one end of design vaulting pole extended to the other end, spacing spout is logical groove, the screw rod section of design bolt is kept away from the one end of design bolt head stretches into in spacing spout and butt at spacing spout groove bottom, the screw rod section of design screw rod can follow spacing spout extending direction and spacing spout sliding fit. Can retrain the design vaulting pole, it is better to last folded plate and lower folded plate's support nature.
As an optimization, the lower wall body is close to the top and the position corresponding to the lower folding plate is provided with a plurality of lower tightening screws at uniform intervals along the length direction of the lower wall body, the central line direction of the lower tightening screws is vertical to the plane of the lower wall body, the two ends of the lower tightening screws respectively penetrate through the lower folding plate on the side where the lower tightening screws are located, the two ends of the lower tightening screws and the rod bodies respectively located outside the lower folding plate are in threaded fit with lower tightening nuts, the lower tightening nuts are tightly abutted against the lower folding plate on the side where the lower tightening screws are located so as to enable the lower folding plate to be tightly abutted against the lower wall body, a plurality of upper tightening screws are evenly arranged at intervals along the length direction of the lower wall body at the position above the lower wall body and corresponding to the upper folding plate, the central line direction of the upper tightening screws is vertical to the plane of the lower wall body, and the two ends of the upper tightening screws respectively penetrate through the upper folding plate on the side where the upper tightening screws are located, and the two ends of the upper tensioning screw rod are respectively positioned on the upper tensioning nuts in threaded fit on the rod body outside the upper folding plate, and the upper tensioning nuts are abutted against the outer side surface of the upper folding plate on the side where the upper tensioning nuts are positioned. The stability of the upper folded plate and the lower folded plate is improved, and the concrete forming quality is favorably improved.
In conclusion, the beneficial effects of the invention are as follows: the invention has simple and convenient construction, better sealing performance for concrete pouring at the junction of the new wall and the old wall, avoids the occurrence of mold explosion and improves the concrete molding quality.
Drawings
For purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings, in which:
FIG. 1 is a schematic view of an installation structure of a control template for forming at the junction of a new and old cast-in-place concrete wall according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the construction method for improving the forming quality of the junction of the new and old cast-in-place concrete walls in the present embodiment includes the following steps:
(1) supporting a wall formwork of the lower-layer wall body 1, completing concrete pouring of the lower-layer wall body 1, and removing the wall formwork at the top of the lower-layer wall body 1 after concrete of the lower-layer wall body 1 is solidified and formed to expose the top of the lower-layer wall body 1;
(2) the control template comprises a rectangular rigid back plate, a lower side edge of the rigid back plate is outwards bent to form a lower folded edge 2, the plane of the lower folded edge 2 is perpendicular to the plane of the rigid back plate, one side edge of the lower folded edge 2, which is far away from the rigid back plate, is downwards bent to form a lower protective edge 3, the plane of the lower protective edge 3 is parallel to the plane of the rigid back plate, an upper folded edge 4 is outwards bent to form an upper side edge 4, the plane of the upper folded edge 4 is perpendicular to the plane of the rigid back plate, one side edge of the upper folded edge 4, which is far away from the rigid back plate, is upwards bent to form an upper protective edge 5, the plane of the upper protective edge 5 is parallel to the plane of the rigid back plate, the distances between the inner side surface of the rigid back plate and the inner side surfaces of the upper protective edge 5 and the lower protective edge 3 are respectively consistent with the thickness of a wall template, and the upper protective edge 5 and the lower protective edge 3 are respectively uniformly spaced along the length direction of the side edge of the rigid back plate at the side where the rigid back plate is located A plurality of through holes are arranged;
(3) installing forming control templates at the junction of the new and old cast-in-place concrete walls on the inner side and the outer side of the top of the lower wall body 1 respectively, when the forming control templates at the junction of the new and old cast-in-place concrete walls are installed, abutting the inner side surface of a rigid back plate on the side where the rigid back plate is located and on the exposed side surface of the lower wall body 1, abutting the bottom surface of a lower folded edge 2 of the rigid back plate on the top of an adjacent wall template below, abutting the inner side surface of a lower protective edge 3 of the rigid back plate on the outer side surface of a wall template in the lower wall body 1 abutting against the lower folded edge 2, positioning an upper folded edge 4 of the rigid back plate above the top of the lower wall body 1, completing the forming control templates at the junction of the new and old cast-in-place concrete walls on the inner side and the outer side of the top of the lower wall body 1, enabling through holes on the two lower protective edges 3 on the inner side and the outer side of the lower wall body 1 to be oppositely arranged, and drilling lower through holes with the same center line as the through holes on the wall template between the lower wall body 1, installing a lower opposite stay bar 6, wherein two ends of the lower opposite stay bar 6 respectively penetrate out of the lower protective edges 3 at two sides, screwing a lower pressing nut 7 in threaded fit with the lower opposite stay bar 6 on a bar body of the lower opposite stay bar 6 positioned outside the lower protective edges 3, pressing a wall formwork of the lower-layer wall 1 corresponding to the lower protective edges 3 on the lower-layer wall 1 through the lower pressing nut 7 by the lower protective edges 3, and then removing the wall formworks of the other lower-layer walls 1;
(4) after all cast-in-place concrete new and old wall juncture molding control templates are installed, binding upper wall body reinforcing steel bars above a lower wall body 1, then installing wall templates of an upper wall body adjacent to the cast-in-place concrete new and old wall juncture molding control templates at the top of the cast-in-place concrete new and old wall juncture molding control templates, arranging the bottom of the wall templates of the upper wall body on the top surface of an upper folded edge 4, flushing the inner side surface of the wall templates of the upper wall body with the inner side surface of a rigid back plate, enabling the outer side surface of the bottom of the wall templates of the upper wall body to abut against the inner side surface of the upper protected edge 5, drilling upper through holes with the same central line as the through holes at positions corresponding to the through holes on the bottom of the wall templates of the upper wall body and the upper protected edge 5, installing a diagonal pull rod 8, enabling two ends of the diagonal rod 8 to respectively penetrate out of the upper protected edges 5 at two sides, and rotating a rod body of the diagonal rod 8 positioned outside the upper protected edge 5 to abut against the diagonal rod 8 in threaded fit with the diagonal rod 8 And the upper abutting nut 9 abuts against the outer side of the upper protective edge 5, the inner side of the upper protective edge 5 abuts against the outer side of the upper wall middle wall formwork in abutting connection with the upper folded edge 4, the wall formwork of the upper wall adjacent to the upper side of the rigid backboard is supported, then the wall formworks of the other upper wall bodies are installed and supported simultaneously, the upper wall body concrete is poured, and the upper wall body concrete is solidified and molded.
In the specific embodiment, the rigid backboard comprises an upper folding plate 10 and a lower folding plate 11 which are rectangular, the upper folding edge 4 is positioned at the upper side edge of the upper folding plate 10, the lower folding edge 2 is positioned at the lower side edge of the lower folding plate 11, the lower side edge of the upper folding plate 10 is opposite to the upper side edge of the lower folding plate 11 and is hinged together, the outer side surface of the upper folding plate 10 and the outer side surface of the lower folding plate 11 are respectively provided with a plurality of shaping seats 12 at even intervals along the length direction parallel to the hinged edges of the upper folding plate and are opposite to each other, the bottom surface of each shaping seat 12 is concavely provided with a through groove, a shaping installation hole is formed between each through groove and the corresponding upper folding plate 10 or lower folding plate 11, when the inner side surfaces of the upper folding plate 10 and the lower folding plate 11 rotate to the same plane, the shaping hole positioned on the upper folding plate 10 is opposite to the corresponding shaping hole positioned on the lower folding plate 11, a shaping support rod 13 is arranged between the two corresponding shaping holes, two ends of each shaping support rod 13 penetrate through two corresponding shaping holes respectively, each shaping support rod 13 is abutted to the outer side surface of each upper folded plate 10 and each lower folded plate 11 respectively, one side, opposite to the corresponding upper folded plate 10 or the corresponding lower folded plate 11, of each shaping base 12 is provided with a shaping screw hole communicated with each shaping installation hole, the central line direction of each shaping screw hole is perpendicular to the plane of the corresponding upper folded plate 10 or the corresponding lower folded plate 11, each shaping base 12 is provided with a shaping bolt, the screw section of each shaping bolt penetrates through the corresponding shaping screw hole and extends into the corresponding shaping installation hole, each shaping bolt is in threaded fit with the corresponding shaping screw hole, one end, extending into each shaping installation hole, of each shaping bolt is abutted to the corresponding shaping support rod 13, so that each shaping support rod 13 is abutted to the corresponding upper folded plate 10 and the corresponding lower folded plate 11 respectively;
after all the cast-in-place concrete new and old wall junction forming control templates are installed, the upper folding plates 10 are respectively rotated outwards, then upper layer wall body steel bars are bound, after the upper layer wall body steel bars are bound, the upper folding plates 10 are rotated again, the inner side surfaces of the upper folding plates 10 and the inner side surfaces of the lower folding plates 11 are located on the same plane, the forming support rods 13 penetrate through the two corresponding forming holes, meanwhile, the forming support rods 13 are respectively abutted to the outer side surfaces of the upper folding plates 10 and the lower folding plates 11, and then forming bolts located at two ends of the forming support rods 13 are respectively screwed, so that the forming bolts are abutted to the forming support rods 13.
In this embodiment, design vaulting pole 13 towards in seted up on one side of design screw along design vaulting pole 13 central line direction by the spacing spout of the one end extension of design vaulting pole 13 to the other end, spacing spout are logical groove, the screw rod section of design bolt is kept away from the one end of design bolt head stretches into in spacing spout and butt on the spacing spout groove bottom, the screw rod section of design screw rod can follow spacing spout extending direction and spacing spout sliding fit.
In the present embodiment, the lower wall 1 is close to the top and the position corresponding to the lower folding plate 11 is provided with a plurality of lower tightening screws 14 at uniform intervals along the length direction of the lower wall 1, the central line direction of the lower tightening screws 14 is perpendicular to the plane of the lower wall 1, two ends of the lower tightening screws 14 are respectively passed through the lower folding plate 11 at the side thereof, two ends of the lower tightening screws 14 are respectively in threaded fit with lower tightening nuts 15 on the rods outside the lower folding plate 11, the lower tightening nuts 15 are tightly pressed against the lower folding plate 11 at the side thereof so that the lower folding plate 11 is tightly pressed against the lower wall 1, a plurality of upper tightening screws 16 are evenly arranged at intervals along the length direction of the lower wall 1 at the position above the lower wall 1 and corresponding to the upper folding plate 10, the central line direction of the upper tightening screws 16 is perpendicular to the plane of the lower wall 1, two ends of the upper tensioning screw 16 respectively penetrate through the upper folding plate 10 on the side where the upper tensioning screw is located, two ends of the upper tensioning screw 16 are respectively located on upper tensioning nuts 17 which are in threaded fit with the rod body outside the upper folding plate 10, and the upper tensioning nuts 17 abut against the outer side surface of the upper folding plate 10 on the side where the upper tensioning nuts 17 are located.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A construction method for improving the forming quality of the junction of new and old cast-in-place concrete walls is characterized in that: the method comprises the following steps:
(1) supporting a wall template of the lower-layer wall body, completing concrete pouring of the lower-layer wall body, and removing the wall template positioned at the top of the lower-layer wall body after the concrete of the lower-layer wall body is solidified and formed, so that the top of the lower-layer wall body is exposed;
(2) the method comprises the steps of obtaining a forming control template for the junction of a cast-in-place concrete new wall and an old wall, wherein the forming control template comprises a rectangular rigid back plate, a lower side edge of the rigid back plate is outwards bent to form a lower folding edge, a plane where the lower folding edge is located is perpendicular to a plane where the rigid back plate is located, a side edge, far away from the rigid back plate, of the lower folding edge is downwards bent to form a lower protective edge, the plane where the lower protective edge is located is parallel to the plane where the rigid back plate is located, an upper folding edge is outwards bent to form an upper folding edge, a plane where the upper folding edge is located is perpendicular to the plane where the rigid back plate is located, a side edge, far away from the rigid back plate, of the upper protective edge is upwards bent to form an upper protective edge, a plane where the upper protective edge is located is parallel to the plane where the rigid back plate is located, the distance between the inner side surface of the rigid back plate and the inner side surface of the upper protective edge and the inner side surface of the lower protective edge is respectively consistent with the thickness of a wall template, and a plurality of perforations are respectively arranged along the length direction of the side edge of the rigid back plate at the side where the upper protective edge and the lower protective edge are evenly spaced;
(3) installing a cast-in-place concrete new and old wall junction forming control template on the inner side and the outer side of the top of a lower wall body respectively, when the cast-in-place concrete new and old wall junction forming control template is installed, abutting the inner side surface of a rigid back plate on the side where the rigid back plate is located and the side surface of the exposed lower wall body, abutting the bottom surface of a lower folded edge of the rigid back plate on the top of an adjacent wall template below, abutting the inner side surface of a lower protective edge of the rigid back plate on the outer side surface of a lower wall body middle wall template abutted with the lower folded edge, positioning an upper folded edge of the rigid back plate above the top of the lower wall body, installing the cast-in-place concrete new and old wall junction forming control templates located on the inner side and the outer side of the top of the lower wall body, enabling through holes on the two lower protective edges located on the inner side and the outer side of the lower wall body to be arranged oppositely, and drilling lower, installing a lower opposite stay bar, wherein two ends of the lower opposite stay bar respectively penetrate out of the lower protective edges at two sides, screwing a lower pressing nut in threaded fit with the lower opposite stay bar on a bar body of the lower opposite stay bar positioned outside the lower protective edges, pressing a wall template of a lower-layer wall body corresponding to the lower protective edges on the lower-layer wall body through the lower pressing nut, and then removing the wall templates of the other lower-layer wall bodies;
(4) after all cast-in-place concrete new and old wall junction forming control templates are installed, binding upper wall body steel bars above a lower wall body, installing wall templates of an upper wall body adjacent to the cast-in-place concrete new and old wall junction forming control templates on the top of the cast-in-place concrete new and old wall junction forming control templates, arranging the bottom of the wall templates of the upper wall body on the top surface of an upper folded edge, leveling the inner side surface of the wall templates of the upper wall body with the inner side surface of a rigid back plate to enable the outer side surface of the bottom of the wall templates of the upper wall body to be abutted against the inner side surface of the upper protective edge, drilling upper through holes with the same center line as the through holes at positions corresponding to the through holes on the upper protective edge at the bottom of the wall templates of the upper wall body, installing diagonal rods, respectively penetrating the two ends of the upper diagonal rods outside the upper protective edges at the two sides, screwing upper diagonal rods on rods outside the upper protective edges to be abutted against nuts in threaded fit with the upper diagonal rods, the upper abutting nut abuts against the outer side face of the upper protective edge, the inner side face of the upper protective edge abuts against the outer side face of the upper-layer wall body middle wall formwork in abutting connection with the upper folded edge, the wall formwork of the upper-layer wall body adjacent to the upper side of the rigid back plate is supported, then the wall formworks of the other upper-layer wall bodies are installed and supported simultaneously, upper-layer wall body concrete is poured, and the upper-layer wall body concrete is solidified and molded.
2. The construction method for improving the forming quality of the junction of the new wall and the old wall of the cast-in-place concrete according to claim 1, characterized in that: the rigid back plate comprises an upper folded plate and a lower folded plate which are rectangular, the upper folded edge is positioned at the upper side edge of the upper folded plate, the lower folded edge is positioned at the lower side edge of the lower folded plate, the lower side edge of the upper folded plate is opposite to the upper side edge of the lower folded plate and is hinged together, the outer side surface of the upper folded plate and the outer side surface of the lower folded plate are respectively provided with a plurality of shaping seats at uniform intervals and oppositely along the length direction parallel to the hinged edges, the bottom surface of each shaping seat is concavely provided with a through groove, a shaping mounting hole is formed between each through groove and the corresponding upper folded plate or lower folded plate, when the upper folded plate and the lower folded plate rotate until the inner side surfaces of the upper folded plate and the lower folded plate are positioned on the same plane, the shaping holes positioned on the upper folded plate and the corresponding shaping holes positioned on the lower folded plate are oppositely arranged, a shaping support rod is arranged between the two corresponding shaping holes, the shaping support rods are respectively abutted against the outer side surfaces of the upper folding plate and the lower folding plate, one side of the shaping base, which is opposite to the corresponding upper folding plate or lower folding plate, is provided with a shaping screw hole communicated with the shaping mounting hole, the central line direction of the shaping screw hole is vertical to the plane of the corresponding upper folding plate or lower folding plate, a shaping bolt is arranged on the shaping base, a screw section of the shaping bolt penetrates through the corresponding shaping screw hole and extends into the shaping mounting hole, the shaping bolt is in threaded fit with the shaping screw hole, and one end of the shaping bolt, which extends into the shaping mounting hole, is abutted against the corresponding shaping support rods so that the shaping support rods are respectively abutted against the upper folding plate and the lower folding plate;
after all the cast-in-place concrete new and old wall junction forming control templates are installed, the upper folding plates are respectively rotated outwards, then upper layer wall body steel bars are bound, after the upper layer wall body steel bars are bound, the upper folding plates are rotated, the inner side surfaces of the upper folding plates and the inner side surfaces of the lower folding plates are located on the same plane, the shaping support rods penetrate through the two corresponding shaping holes, the shaping support rods are respectively abutted to the outer side surfaces of the upper folding plates and the lower folding plates, and then the shaping bolts located at two ends of the shaping support rods are respectively screwed, so that the shaping bolts are abutted to the shaping support rods.
3. The construction method for improving the forming quality of the junction of the new wall and the old wall of the cast-in-place concrete according to claim 2, characterized in that: the design vaulting pole towards in seted up on one side of design screw along design vaulting pole central line direction by the one end of design vaulting pole extends to the spacing spout of the other end, and spacing spout is logical groove, the screw rod section of design bolt is kept away from the one end of design bolt head stretches into in spacing spout and butt on spacing spout groove bottom, the screw rod section of design screw rod can follow spacing spout extending direction and spacing spout sliding fit.
4. The construction method for improving the forming quality of the junction of the new wall and the old wall of the cast-in-place concrete according to claim 2, characterized in that: the lower wall body is close to the top and corresponds to the position of the lower folded plate, a plurality of lower tensioning screws penetrate through the lower folded plate at uniform intervals along the length direction of the lower wall body, the central line direction of the lower tensioning screws is vertical to the plane of the lower wall body, two ends of each lower tensioning screw penetrate through the lower folded plate at the side of the lower tensioning screw respectively, lower tensioning nuts are in threaded fit with two ends of each lower tensioning screw and are respectively positioned on the rod body outside the lower folded plate, the lower tensioning nuts are abutted against the lower folded plate at the side of the lower tensioning screws so that the lower folded plate is abutted against the lower wall body, a plurality of upper tensioning screws are uniformly arranged at intervals along the length direction of the lower wall body at the position above the lower wall body and corresponding to the upper folded plate, the central line direction of the upper tensioning screws is vertical to the plane of the lower wall body, and two ends of the upper tensioning screws penetrate through the upper folded plate, and the two ends of the upper tensioning screw rod are respectively positioned on the upper tensioning nuts in threaded fit on the rod body outside the upper folding plate, and the upper tensioning nuts are abutted against the outer side surface of the upper folding plate on the side where the upper tensioning nuts are positioned.
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