CN113832828A - Cast-in-place box girder side form back rib and bracing sleeve pipe support system - Google Patents
Cast-in-place box girder side form back rib and bracing sleeve pipe support system Download PDFInfo
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- CN113832828A CN113832828A CN202111173311.4A CN202111173311A CN113832828A CN 113832828 A CN113832828 A CN 113832828A CN 202111173311 A CN202111173311 A CN 202111173311A CN 113832828 A CN113832828 A CN 113832828A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
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Abstract
The invention discloses a cast-in-place box girder side form back rib and diagonal bracing sleeve supporting system, which comprises a double-limb channel steel and a telescopic sleeve; the double-limb channel steel comprises an upper double-limb channel steel, a lower double-limb channel steel and an inclined double-limb channel steel; the telescopic sleeve comprises a vertical telescopic sleeve and an inclined strut telescopic sleeve; n vertical telescopic sleeves are arranged between the double-limb channel steel and the lower double-limb channel steel; both ends are provided with an inclined strut telescopic sleeve; the upper end and the lower end of the telescopic sleeve are both provided with sleeve bolt connecting holes. The invention has the beneficial effects that: the construction operability is strong, and the engineering quality of the cast-in-place box girder is ensured. And a green construction idea is implemented, and energy-saving and environment-friendly measures of replacing wood with steel are implemented. The stress system is more stable. Through the transverse bridge direction arrangement of the double-limb channel steel as supporting points, the inclined strut casing supporting systems are symmetrically arranged on two sides of the cast-in-place box girder, so that the supporting rigidity of the web side form is improved, and the risk of sliding of the side form is reduced.
Description
The technical field is as follows:
the invention relates to the field of building construction, in particular to a cast-in-place box girder side form back rib and an inclined strut casing pipe supporting system.
Background art:
with the rapid development of bridge construction, the cast-in-place box girder construction process is basically mature, and a standardized construction process is adopted. Traditional cast-in-place box girder web side form supports mainly adopt scaffold steel pipe diagonal bracing to construct on full hall support, because full hall support side direction holding power is restricted, often makes the support rigidity of web side form not enough, leads to behind pouring web side form concrete, the web side form appears warping, the concrete appears leaking the thick liquid scheduling problem. This project adopts the combination of double limb channel-section steel and bracing sleeve pipe to be under construction, even if be convenient for the construction, raises the efficiency, has ensured construction quality again. In order to ensure the correct use of the new process and the engineering quality, the construction method is specially made to be beneficial to the engineering implementation.
The invention content is as follows:
the invention provides a cast-in-place box girder side form back rib and an inclined strut casing pipe supporting system for solving the problems.
The technical scheme of the invention is as follows: a back rib and diagonal brace supporting system for a side form of a cast-in-situ box girder comprises double-limb channel steel and a telescopic sleeve
The double-limb channel steel comprises an upper double-limb channel steel, a lower double-limb channel steel and an inclined double-limb channel steel; the upper double-limb channel steel and the lower double-limb channel steel are horizontally arranged; the upper double-limb channel steel is arranged above and the lower double-limb channel steel is arranged below; two ends of the upper double-limb channel steel and the lower double-limb channel steel are respectively connected with an inclined double-limb channel steel;
the telescopic sleeve comprises a vertical telescopic sleeve and an inclined strut telescopic sleeve;
n vertical telescopic sleeves are arranged between the upper double-limb channel steel and the lower double-limb channel steel; both ends are provided with an inclined strut telescopic sleeve;
the upper end and the lower end of the telescopic sleeve are provided with sleeve bolt connecting holes;
channel steel bolt connecting holes are formed in the upper double-limb channel steel and the lower double-limb channel steel;
the telescopic sleeve is fixedly connected with channel steel bolt connecting holes arranged on the upper double-limb channel steel and the lower double-limb channel steel through sleeve bolt connecting holes by bolts;
the inclined double-limb channel steel is obliquely arranged at two ends of the upper double-limb channel steel and the lower device channel steel; the lower end of the upper double-limb channel steel is fixedly connected with the lower double-limb channel steel through a lower connecting plate and a bolt, and the upper end of the upper double-limb channel steel is fixedly connected with the upper double-limb channel steel through an upper connecting plate and a bolt; a channel steel bolt connecting hole is formed in the position 1/4 of the inclined double-limb channel steel and is connected with the upper part of an inclined strut telescopic sleeve through a bolt, the lower part of the inclined strut telescopic sleeve is fixedly connected with a channel steel bolt connecting hole in the lower double-limb channel steel through a sleeve bolt connecting hole, and the inclined angle between the inclined strut telescopic sleeve and the lower double-limb channel steel is 45-60 degrees;
the double-limb channel steel is national standard 12 channel steel.
The distance between the upper double-limb channel steel and the lower double-limb channel steel is determined according to different beam heights of the cast-in-place box beam; the distance between the vertical telescopic sleeves is 10 cm; the distance between the channel steel bolt connecting holes arranged on the double-limb channel steel is 10 cm;
the telescopic sleeve is characterized in that the diameter of the outer tube is 60mm, the thickness of the outer tube is 3.2mm, and the diameter of the inner telescopic rod is 48mm, and the thickness of the inner telescopic rod is 3.2 mm; the telescopic sleeve is connected with the support through the height adjustment of the steel pipe fastener.
The specific construction method comprises the following steps:
the method comprises the following steps: support erection
Determining the distance between the brackets through the force checking calculation of the bracket system; after the foundation treatment meets the bearing capacity requirement, leveling a concrete cushion layer, integrally arranging points on the concrete cushion layer before the vertical rods are installed, determining the positions of bottom supports of adjustable screw rods, checking the verticality of the vertical rods by using a plumb bob during installation of the vertical rods, preventing the vertical rods from being stressed eccentrically, and fixing the connection parts of rod pieces by using connecting pins;
placing adjustable screw rod bottom supports on the concrete cushion layer according to the transverse and longitudinal intervals, measuring and determining the elevation of the adjustable screw rod bottom supports by using a level gauge on site, adjusting the positions of adjustable screw caps and ensuring the uniform plane of the frame body; the kneading length of the adjustable base screw rod and the nut is not less than 4-5 buttons, and the length of the adjustable base screw rod and the nut inserted into the vertical rod is not less than 150 mm; the maximum height of the first-layer longitudinal and transverse sweeping rod of the bracket from the ground is not more than 55 cm;
after the top layer vertical rods are assembled, the adjustable jacking of the top layer is installed, the top surface of each jacking is adjusted to the designed elevation position according to the designed elevation, and the extending distance of the jacking is not more than 35 cm;
step two: laying main keel
After the top surface of the jacking support is adjusted to the designed elevation position, double-limb channel steel is laid, and the double-limb channel steel is transversely connected end to end by using a connecting piece to form a whole, and joints are staggered along the bridge direction; the laying distance is strictly carried out according to the design, the box girder pre-camber is reserved, the elevation is checked by using a level gauge, and the next procedure can be carried out after no error exists; the main keel is made of double-limb channel steel;
step three: laying secondary keel
After the main joist was laid and is accomplished, carry out the secondary joist and lay, this project utilizes square pipe as the secondary joist, and the horizontal bridge of square pipe should stagger the seam to arranging. The laying distance is strictly carried out according to the design, the box girder pre-camber is reserved, the elevation is checked by using a level gauge, and the next procedure can be carried out after no error exists;
step four: laying bottom die
The bottom die usually uses high-quality bamboo plywood, after the secondary joist is laid and adjusted, a square timber is placed at the bottom of the splicing seam of the bamboo plywood according to the size and the laying position of the bamboo plywood and is used for splicing, the square timber is consistent with the square pipe in thickness and direction, after the bottom die is laid, a level gauge is used for checking elevation, and the next procedure can be carried out after the elevation is correct.
Step five: installation side form back of body rib and bracing sleeve pipe
After the plane position lofting is finished through measurement, mounting a web side die back rib and a flange template back rib by using double-limb channel steel according to positioning points, connecting two ends of the web side die back rib with a main keel at the top of a support and the flange template back rib respectively by using connecting plates, connecting a back rib support with a telescopic diagonal bracing sleeve through bolts, connecting the bottom of the telescopic diagonal bracing sleeve with the main keel at the top of the support through bolts, determining the distance between longitudinal telescopic diagonal bracing sleeves through force checking, and after the mounting is finished, connecting at least one steel pipe fastener in the longitudinal direction of the telescopic sleeve support at the outermost side to increase the stability of the telescopic sleeve support; the side die back ribs are made of double-limb channel steel materials;
step six: mounting side form
After the installation of the web side die back rib, the flange template back rib and the support system is finished, the installation of the web side die and the flange template is carried out through measurement and rechecking, whether cracks exist in the template before use and the appearance quality meets the requirements, a release agent is coated on the surface, and the release agent is of the same type; double-sided adhesive tapes are padded at the joint of the butt joint openings before installation to prevent slurry leakage; and during the installation of the template, the overall structure size of the cast-in-place box girder is noticed. And after the template is installed, the plane position, the top elevation, the node relation and the longitudinal and transverse stability of the template are rechecked.
Step seven: side form dismantling
After the concrete pouring is finished, the poured concrete can be disassembled after reaching the form removal strength by checking the test block strength report under the same condition of the concrete; when the flange formwork is dismantled, the telescopic sleeve (2) and the double-limb channel steel (1) are firstly loosened, the side formwork is dismantled after the flange formwork is dismantled, the formwork is dismantled in blocks, and the flange formwork is manually matched with a truck-mounted crane to be dismantled.
Compared with the prior art, the invention has the beneficial effects that:
(1) the construction operability is strong, and the reinforcing and supporting construction progress of the web side mold can be rapidly improved.
(2) The construction operation difficulty of bad phenomena such as seams, wrong stubbles and the like caused by different rigidity and deflection of the template and the frame body is solved, and the engineering quality of the cast-in-place box girder is ensured.
(3) The main keels, the telescopic sleeves and the back ribs of the side molds are connected to form triangular stress, so that a stress system is more stable.
(4) The main keels are arranged in the transverse bridge direction to serve as supporting points, and diagonal bracing sleeve supporting systems are symmetrically arranged on two sides of the cast-in-place box girder, so that the supporting rigidity of the web side die is improved, and the risk of sliding of the side die is reduced.
(5) A green construction idea is implemented, and energy-saving and environment-friendly measures of replacing wood with steel are implemented by taking double-limb channel steel as a main keel and a template back rib.
Description of the drawings:
FIG. 1: the invention has a structure schematic diagram.
FIG. 2: the construction flow chart of the invention.
FIG. 3: the invention discloses a schematic structural diagram of an adjustable screw rod bottom support.
FIG. 4: the invention discloses a schematic installation diagram of a transverse and longitudinal upright rod.
In the figure: the adjustable screw rod comprises a double-limb channel steel 1, a telescopic diagonal bracing sleeve 2, an upper double-limb channel steel 11, a lower double-limb channel steel 12, a side double-limb channel steel 13, a bolt connecting hole 3, a connecting plate 4, an adjustable screw rod bottom support 5 and a vertical rod 6.
The specific implementation mode is as follows:
examples
As shown in the figure: 1. the utility model provides a cast-in-place case roof beam side form back of body rib and bracing sleeve pipe support system which characterized in that: comprises a double-limb channel steel 1 and a telescopic sleeve 2;
the double-limb channel steel 1 comprises an upper double-limb channel steel 11, a lower double-limb channel steel 12 and an inclined double-limb channel steel 13; the upper double-limb channel steel 11 and the lower double-limb channel steel 12 are horizontally arranged; the upper double-limb channel steel 11 is arranged above the lower double-limb channel steel 12; two ends of the upper double-limb channel steel 11 and the lower double-limb channel steel 12 are respectively connected with an inclined double-limb channel steel 13;
the telescopic sleeve 2 comprises a vertical telescopic sleeve 21 and an inclined strut telescopic sleeve 22;
n vertical telescopic sleeves 21 are arranged between the double-limb channel steel 11 and the lower double-limb channel steel 12; both ends are provided with an inclined strut telescopic sleeve 22;
the upper end and the lower end of the telescopic sleeve 2 are both provided with sleeve bolt connecting holes 31;
channel steel bolt connecting holes 32 are formed in the upper double-limb channel steel 11 and the lower double-limb channel steel 12;
the telescopic sleeve 2 is fixedly connected with channel steel bolt connecting holes 32 arranged on the upper double-limb channel steel 11 and the lower double-limb channel steel 12 through sleeve bolt connecting holes 31 by bolts;
the inclined double-limb channel steel 13 is obliquely arranged at two ends of the upper double-limb channel steel 11 and the lower device channel steel 12; the lower end of the lower double-limb channel steel is fixedly connected with the lower double-limb channel steel 12 through a lower connecting plate 41, and the upper end of the lower double-limb channel steel is fixedly connected with the upper double-limb channel steel 11 through an upper connecting plate 42; the 1/4 department of the oblique double-limb channel steel 13 is provided with a channel steel bolt connecting hole 32 which is connected with the upper part of the diagonal bracing telescopic tube 22 through a bolt, the lower part of the diagonal bracing telescopic tube 22 is fixedly connected with a channel steel bolt connecting hole 31 on the lower double-limb channel steel 12 through a sleeve tube bolt connecting hole 31, and the inclination angle between the diagonal bracing telescopic tube 22 and the lower double-limb channel steel is 45-60 degrees.
The double-limb channel steel 1 is a national standard 12 channel steel.
The distance between the upper double-limb channel steel and the lower double-limb channel steel is determined according to different beam heights of the cast-in-place box beam; the distance between the vertical telescopic pipes 21 is 10 cm; the distance between the channel steel bolt connecting holes 32 arranged on the double-limb channel steel 1 is 10 cm;
the telescopic tube 2 is a telescopic tube with the diameter phi of 60mm and the thickness of 3.2mm of an outer tube and the diameter phi of 48mm and the thickness of 3.2mm of an inner telescopic rod; the telescopic tube 2 is connected with a support through the height adjustment of a steel tube fastener 5.
The specific construction method comprises the following steps:
the method comprises the following steps: support erection
1) Determining the distance between the brackets through the force checking calculation of the bracket system; after the foundation treatment meets the bearing capacity requirement, leveling a concrete cushion layer, integrally arranging points on the concrete cushion layer before installing the vertical rods, determining the positions of adjustable screw rod bottom supports 5, checking the verticality of the vertical rods by using a plumb bob during installation of the vertical rods, preventing the vertical rods from being stressed eccentrically, and fixing the rod piece joints by using connecting pins;
2) placing bases of adjustable screw bottom supports 5 on the concrete cushion layer according to the transverse and longitudinal intervals, measuring and determining the elevation of the adjustable screw bottom supports 5 by using a level gauge on site, adjusting the positions of adjustable screw caps and ensuring the uniform plane of the frame body; the kneading length of the adjustable base screw rod and the nut is not less than 4-5 buttons, and the length of the adjustable base screw rod and the nut inserted into the vertical rod 6 is not less than 150 mm; the maximum height of the first-layer longitudinal and transverse sweeping rod of the bracket from the ground is not more than 55 cm;
3) after the top layer vertical rods are assembled, the adjustable jacking of the top layer is installed, the top surface of each jacking is adjusted to the designed elevation position according to the designed elevation, and the extending distance of the jacking is not more than 35 cm; step two: laying main keel
After the top surface of the jacking support is adjusted to a designed elevation position, the double-limb channel steel 1 is laid, and the bolts of the connecting pieces which are transversely connected end to end of the double-limb channel steel 1 are locked by the connecting pieces to form a whole, and the joints are arranged along the bridge direction and are suitable to be staggered; the laying distance is strictly carried out according to the design, the box girder pre-camber is reserved, the elevation is checked by using a level gauge, and the next procedure can be carried out after no error exists; the main keel is made of double-limb channel steel;
step three: laying secondary keel
After the main joist was laid and is accomplished, carry out the secondary joist and lay, this project utilizes square pipe as the secondary joist, and the horizontal bridge of square pipe should stagger the seam to arranging. The laying distance is strictly carried out according to the design, the box girder pre-camber is reserved, the elevation is checked by using a level gauge, and the next procedure can be carried out after no error exists;
step four: laying bottom die
The bottom die usually uses high-quality bamboo plywood, after the secondary joist is laid and adjusted, a square timber is placed at the bottom of the splicing seam of the bamboo plywood according to the size and the laying position of the bamboo plywood and is used for splicing, the square timber is consistent with the square pipe in thickness and direction, after the bottom die is laid, a level gauge is used for checking elevation, and the next procedure can be carried out after the elevation is correct.
Step five: installation side form back of body rib and bracing sleeve pipe
After the plane position lofting is finished through measurement, mounting a web side die back rib and a flange template back rib by using a double-limb channel steel 1 according to a positioning point, connecting two ends of the web side die back rib with a main keel at the top of a support and the flange template back rib respectively by using a connecting plate, connecting a back rib support with a telescopic diagonal bracing sleeve through bolts, connecting the bottom of the telescopic diagonal bracing sleeve with the main keel at the top of the support through bolts, determining the distance between longitudinal telescopic diagonal bracing sleeves through force checking, and after the mounting is finished, connecting at least one steel pipe fastener in the longitudinal direction of the telescopic sleeve support at the outermost side to increase the stability of the telescopic sleeve support; the side die back ribs are made of double-limb channel steel materials;
step six: mounting side form
After the installation of the web side die back rib, the flange template back rib and the support system is finished, the installation of the web side die and the flange template is carried out through measurement and rechecking, whether cracks exist in the template before use and the appearance quality meets the requirements, a release agent is coated on the surface, and the release agent is of the same type; double-sided adhesive tapes are padded at the joint of the butt joint openings before installation to prevent slurry leakage; and during the installation of the template, the overall structure size of the cast-in-place box girder is noticed. And after the template is installed, the plane position, the top elevation, the node relation and the longitudinal and transverse stability of the template are rechecked.
Step seven: side form dismantling
After the concrete pouring is finished, the poured concrete can be disassembled after reaching the form removal strength by checking the test block strength report under the same condition of the concrete; when the flange formwork is dismantled, the telescopic sleeve 2 and the double-limb channel steel 1 are firstly loosened, the side formwork is dismantled after the flange formwork is dismantled, the formwork is dismantled in blocks, and the flange formwork is manually matched with a truck-mounted crane to be dismantled.
Practices prove that the side die back rib and the inclined strut casing supporting system are adopted, so that the economic benefit and the social benefit are remarkable.
(1) The economic benefit is remarkable
Taking the construction of a cast-in-place box beam support of a general contract project of the construction of a tribute No. 42 road (Huangma high-speed tribute south overpass connecting line) in a tribute zone in Kunming city in Yunnan province as an example:
A. the socket joint formula dish is buckled the support in this project, compares the selection and receives the force to check and calculate through the scheme, and horizontal pole, vertical pole interval are 120cm, are different from multiple intervals such as traditional support horizontal pole 60cm or 90cm, and the arrangement and allotment of the horizontal pole of being convenient for, vertical pole material improve the support and set up speed, and whole construction period shortens greatly.
B. According to the project, 63t of the side die template is purchased according to the resource allocation condition, the purchase price is 6950 yuan/ton, and due to the fact that a side die back rib and an inclined strut sleeve supporting system are used and a support is matched, the side die and the flange template do not use an outer side truss, the weight of the template is reduced by 50%, and the cost is saved by about 47850 yuan.
(2) Remarkable social benefit
A. The cross bridge of the double-limb channel steel (main keel) is arranged in the transverse direction to serve as a supporting point, and the inclined strut casing supporting systems are symmetrically arranged on the two sides of the cast-in-place box girder, so that the supporting rigidity of the web side form is improved, the risk of sliding of the side form is reduced, and the structural size and the impression quality requirements of the cast-in-place box girder are met.
B. The traditional square timber is optimized into channel steel serving as the back rib, so that the use and consumption of a large amount of timber are reduced, the material turnover use frequency is improved, the defect of inconsistent quality of the square timber is avoided, and the measures of replacing the steel for the timber, saving energy and protecting environment are realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (3)
1. The utility model provides a cast-in-place case roof beam side form back of body rib and bracing sleeve pipe support system which characterized in that: comprises a double-limb channel steel (1) and a telescopic sleeve (2);
the double-limb channel steel (1) comprises an upper double-limb channel steel (11), a lower double-limb channel steel (12) and an inclined double-limb channel steel (13); the upper double-limb channel steel (11) and the lower double-limb channel steel (12) are horizontally arranged; the upper double-limb channel steel (11) is arranged above the lower double-limb channel steel (12); two ends of the upper double-limb channel steel (11) and the lower double-limb channel steel (12) are respectively connected with an inclined double-limb channel steel (13);
the telescopic sleeve (2) comprises a vertical telescopic sleeve (21) and an inclined strut telescopic sleeve (22);
n vertical telescopic sleeves (21) are arranged between the upper double-limb channel steel (11) and the lower double-limb channel steel (12); both ends are provided with an inclined strut telescopic sleeve (22);
the upper end and the lower end of the telescopic sleeve (2) are provided with sleeve bolt connecting holes (31);
channel steel bolt connecting holes (32) are formed in the upper double-limb channel steel (11) and the lower double-limb channel steel (12);
the telescopic sleeve (2) is fixedly connected with channel steel bolt connecting holes (32) arranged on the upper double-limb channel steel (11) and the lower double-limb channel steel (12) through sleeve bolt connecting holes (31) by bolts;
the inclined double-limb channel steel (13) is obliquely arranged at two ends of the upper double-limb channel steel (11) and the lower device channel steel (12); the lower end of the upper double-limb channel steel is fixedly connected with the lower double-limb channel steel (12) through a lower connecting plate (41) by bolts, and the upper end of the upper double-limb channel steel is fixedly connected with the upper double-limb channel steel (11) through an upper connecting plate (42) by bolts; a channel steel bolt connecting hole (32) is formed in the position 1/4 of the inclined double-limb channel steel (13) and is connected with the upper portion of an inclined strut telescopic sleeve (22) through a bolt, the lower portion of the inclined strut telescopic sleeve (22) is fixedly connected with a channel steel bolt connecting hole (31) in the lower double-limb channel steel (12) through a sleeve pipe bolt connecting hole (31), and the inclined angle between the inclined strut telescopic sleeve (22) and the lower double-limb channel steel is 45-60 degrees.
2. The cast-in-place box girder side form back rib and bracing sleeve pipe support system of claim 1, characterized in that: the double-limb channel steel (1) is a national standard 12-channel steel;
the distance between the upper double-limb channel steel (11) and the lower double-limb channel steel (12) is determined according to different beam heights of the cast-in-situ box beam; the distance between the vertical telescopic sleeves (21) is 10 cm; the distance between the channel steel bolt connecting holes (32) arranged on the double-limb channel steel (1) is 10 cm;
the telescopic sleeve (2) is a telescopic sleeve with the diameter phi of 60mm and the thickness of 3.2mm of an outer pipe and the diameter phi of 48mm and the thickness of 3.2mm of an inner telescopic rod; the telescopic sleeve (2) is connected with the support through the height adjustment of a steel pipe fastener (5).
3. A construction method of a cast-in-situ box girder side form back rib and diagonal brace sleeve supporting system is used for constructing the cast-in-situ box girder side form back rib and diagonal brace sleeve supporting system according to any one of claims 1-2, and is characterized in that: the specific construction method comprises the following steps:
the method comprises the following steps: support erection
(1) Determining the distance between the brackets through the force checking calculation of the bracket system; after the foundation treatment meets the bearing capacity requirement, leveling a concrete cushion layer, integrally arranging points on the concrete cushion layer before the vertical rods are installed, determining the positions of adjustable screw rod bottom supports (5), checking the verticality of the vertical rods by using a plumb bob during installation of the vertical rods, preventing the vertical rods from being stressed eccentrically, and fixing the rod piece joints by using connecting pins;
(2) placing bases of adjustable screw bottom supports (5) on the concrete cushion layer according to the transverse and longitudinal intervals, determining the elevation of the adjustable screw bottom supports (5) by using a leveling instrument for field measurement, adjusting the positions of adjustable screw caps and ensuring the uniform plane of the frame body; the kneading length of the adjustable base screw rod and the nut is not less than 4-5 buttons, and the length of the adjustable base screw rod and the nut inserted into the vertical rod (6) is not less than 150 mm; the maximum height of the first-layer longitudinal and transverse sweeping rod of the bracket from the ground is not more than 55 cm;
(3) after the top layer vertical rods are assembled, the adjustable jacking of the top layer is installed, the top surface of each jacking is adjusted to the designed elevation position according to the designed elevation, and the extending distance of the jacking is not more than 35 cm;
step two: laying main keel
After the top surface of the jacking support is adjusted to a designed elevation position, double-limb channel steel (1) is laid, and the double-limb channel steel (1) are transversely connected end to end (the bolt of the connecting piece must be locked) by using the connecting piece to form a whole, and joints are arranged along the bridge direction and are easy to stagger; the laying distance is strictly carried out according to the design, the box girder pre-camber is reserved, the elevation is checked by using a level gauge, and the next procedure can be carried out after no error exists; the main keel is made of double-limb channel steel;
step three: laying secondary keel
After the main joist was laid and is accomplished, carry out the secondary joist and lay, this project utilizes square pipe as the secondary joist, and the horizontal bridge of square pipe should stagger the seam to arranging. The laying distance is strictly carried out according to the design, the box girder pre-camber is reserved, the elevation is checked by using a level gauge, and the next procedure can be carried out after no error exists;
step four: laying bottom die
The bottom die usually uses high-quality bamboo plywood, after the secondary joist is laid and adjusted, a square timber is placed at the bottom of the splicing seam of the bamboo plywood according to the size and the laying position of the bamboo plywood and is used for splicing, the square timber is consistent with the square pipe in thickness and direction, after the bottom die is laid, a level gauge is used for checking elevation, and the next procedure can be carried out after the elevation is correct.
Step five: installation side form back of body rib and bracing sleeve pipe
After the plane position lofting is finished through measurement, a web side die back rib and a flange template back rib are installed by using a double-limb channel steel (1) according to a positioning point, two ends of the web side die back rib are respectively connected with a support top main keel and a flange template back rib through a connecting plate, a back rib support is connected with the web side die back rib through a telescopic diagonal bracing sleeve through bolts, the bottom of the telescopic diagonal bracing sleeve is connected with the support top main keel through bolts, the distance between the longitudinal telescopic diagonal bracing sleeves is determined through force checking, after the installation is finished, at least one steel pipe fastener is adopted in the longitudinal direction of the outermost telescopic sleeve support to connect the outermost telescopic sleeve support to increase the stability of the telescopic sleeve support, and the side die back rib is made of a double-limb channel steel material;
step six: mounting side form
After the installation of the web side die back rib, the flange template back rib and the support system is finished, the installation of the web side die and the flange template is carried out through measurement and rechecking, whether cracks exist in the template before use and the appearance quality meets the requirements, a release agent is coated on the surface, and the release agent is of the same type; double-sided adhesive tapes are padded at the joint of the butt joint openings before installation to prevent slurry leakage; and during the installation of the template, the overall structure size of the cast-in-place box girder is noticed. After the template is installed, the plane position, the top elevation, the node relation and the longitudinal and transverse stability of the template are rechecked;
step seven: side form dismantling
After the concrete pouring is finished, the poured concrete can be disassembled after reaching the form removal strength by checking the test block strength report under the same condition of the concrete; when the flange formwork is dismantled, the telescopic sleeve (2) and the double-limb channel steel (1) are firstly loosened, the side formwork is dismantled after the flange formwork is dismantled, the formwork is dismantled in blocks, and the flange formwork is manually matched with a truck-mounted crane to be dismantled.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117802913A (en) * | 2024-02-29 | 2024-04-02 | 北京城建集团有限责任公司 | Cast-in-situ box girder support frame, preparation method and installation method |
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