CN111576232A - Linear control construction method for precast beam top plate - Google Patents
Linear control construction method for precast beam top plate Download PDFInfo
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- CN111576232A CN111576232A CN202010474052.8A CN202010474052A CN111576232A CN 111576232 A CN111576232 A CN 111576232A CN 202010474052 A CN202010474052 A CN 202010474052A CN 111576232 A CN111576232 A CN 111576232A
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a linear control construction method for a precast beam top plate; the method is suitable for prefabricating bridges with flange plates, such as T-shaped beams, box beams and the like. The method has the following characteristics: (1) the devices such as the plane linear adjustment of the precast beam, the beam top cross slope adjustment scale and the like are easy to process and convenient to install; (2) compared with the traditional method for measuring and adjusting the beam top cross slope by using a level gauge, the method is more convenient and safer, and reduces the construction and measurement cost; (3) the method has the advantages of simple and quick operation, high template control precision, capability of greatly improving the linear quality of the top plate of the precast beam, no cross interference with template installation and construction and the like; (4) the bridge deck pavement structure can effectively prevent the precast beams from invading the bridge deck pavement structure layer due to insufficient linear control of the precast beam top plate, the quality problems that the width of the joints between the precast beams of adjacent bridge spans is different, the side lines of the bridge are not in accordance with the design linear requirement and the like, and the safety risk of the bridge structure caused by the quality problems is reduced.
Description
Technical Field
The invention relates to the field related to bridge prefabrication construction, in particular to a prefabricated beam top plate linear control construction method.
Background
In the construction of highway bridge engineering, the superstructure of most bridges is prefabricated and installed. The linear quality of the top plate of the precast beam is often neglected easily in the process of prefabricating the bridge, when the straight-line bridge is prefabricated, because the transverse slope of the top of the precast beam is consistent and unchanged, the outer edge of the edge beam is linear and parallel to the axis of the beam, the side line of the beam end structure is vertical to the axis of the beam, and the linear quality of the top plate is easy to control; however, when a flat-curve section bridge is prefabricated, the beam top cross slope changes due to the fact that the designed height is ultrahigh or the height gradually changes, the outer edge of the edge beam is in a curve shape and is not parallel to the beam axis, and the side line of the beam end structure and the beam axis have a certain oblique intersection angle.
Disclosure of Invention
Therefore, in order to solve the above-mentioned disadvantages, the present invention provides a method for controlling the line shape of a top plate of a precast beam; the method is suitable for prefabricating bridges with flange plates, such as T-shaped beams, box beams and the like. The method designs devices for plane linear adjustment of the top plate of the precast beam, beam top cross slope adjustment scales and the like and a construction method thereof, improves the linear quality of the top plate of the precast beam, summarizes and forms the construction method at present, and is convenient to popularize and use.
The invention is realized in this way, construct a precast beam roof linear control construction method, characterized by that; the construction process flow is as follows;
1) designing and installing a top plate plane linear control device: the plane linear control device of the precast beam top plate mainly comprises two devices of beam end inclination adjustment and edge beam top plate outer edge linear adjustment;
2) designing and manufacturing a beam top cross slope adjusting scale device;
and step 10, realizing the operation of moving, transporting and installing the precast beam.
The linear control construction method for the precast beam top plate is characterized by comprising the following steps of (1) carrying out linear control construction on the precast beam top plate; in step 3, the linear control parameters of the top plate plane are determined according to the following method:
searching and recording bridge flat curve parameters through a design drawing, and generating a bridge flat curve CAD drawing by using software; introducing plane coordinates of structures such as bent cap, precast beam and the like and bridge width data in a bridge design drawing into a flat curve CAD drawing, and drawing a plane relation drawing of the precast beam and the bridge in a flat curve section;
and measuring and determining the length and the inclination of the beam end of each precast beam and the cantilever parameters of the center beam and the edge beam corresponding to each adjusting device in the AutoCAD.
The linear control construction method for the precast beam top plate is characterized by comprising the following steps of (1) carrying out linear control construction on the precast beam top plate; in the step 1, the beam end inclination adjusting device is structurally provided with a full-thread screw, a hexagon nut, a mountain nut, a punching steel plate, a clamping groove, a steel ball and a beam end plug plate; the diameter of the full-thread screw is phi 22mm, 1 steel ball with the diameter phi 30mm is arranged at the end of the full-thread screw, and the steel ball end screw is arranged in a clamping groove at the outer side of the beam end plug plate to form a hinged fulcrum; the clamping groove is made of No. 8 channel steel, is 100mm high, is opened at the upper part and is welded and connected with the outer side of the beam end plug plate; the thickness of the perforated steel plate is 8mm, and the perforated steel plate is perpendicular to the screw rod and welded on a top plate template at the end of the precast beam; hexagonal nut, chevron nut are installed on full silk screw rod and are distributed in the steel sheet both sides that punch, and the screw rod is connected the clamping through hexagonal nut, chevron nut between the steel sheet with punching, through rotatory hexagonal nut, chevron nut control plug board and the screw rod length between the steel sheet that punches during the use, make plug board remove to the design position.
The linear control construction method for the precast beam top plate is characterized by comprising the following steps of (1) carrying out linear control construction on the precast beam top plate; in the step 1, the adjusting device for the outer edge line shape of the top plate of the boundary beam has the following structure and is provided with a full-thread screw rod, a perforated steel plate, a mountain-shaped nut, a hexagonal nut and a side baffle of the boundary beam; the diameter of the full-thread screw is phi 22mm, and the end head of the full-thread screw is vertically welded on the side baffle of the boundary beam; the thickness of the punched steel plate is 8mm, and the punched steel plate is perpendicular to the screw rod and is welded on the side die stand column; hexagonal nut, chevron nut are installed on full screw rod and are distributed in the steel sheet both sides that punch, and through hexagonal nut, chevron nut connection clamping between full screw rod and the steel sheet that punches, through rotatory hexagonal nut and chevron nut control side shield and the screw length between the steel sheet that punches during the use, make the boundary beam side shield remove to the design position.
The linear control construction method for the precast beam top plate is characterized by comprising the following steps of (1) carrying out linear control construction on the precast beam top plate; in the step 1, the beam top cross slope adjusting and scaling device is structurally provided with a cross slope scale, angle steel measuring points and a magnetic level bar; a cross slope graduated scale is additionally arranged on a column of a side die of the precast beam, an angle steel measuring point is arranged on the lower brim of a top plate die plate, and after the column is positioned by adopting a magnetic level bar method, the existing cross slope adjusting screw is adjusted to enable the angle steel measuring point to be tightly attached to the level bar, so that the beam top meets the requirement of designing the cross slope; the device is provided with 1 part on each side of the template according to the position of each side form stand column along the length direction of the precast beam, and meets the requirements of strength and rigidity required by the precast beam top plate concrete pouring;
according to the advancing direction of the route, the bridge positioned on the left side of the center line of the road is called a left bridge, and the bridge positioned on the right side of the center line of the road is called a right bridge. For convenience of construction management, according to the left side and the right side of the bridge, the cross slope is a positive value when ascending, and the cross slope is a uniform mark of a negative value when descending.
The linear control construction method for the precast beam top plate is characterized by comprising the following steps of (1) carrying out linear control construction on the precast beam top plate; the angle steel measuring point adopts angle steel with the length of 100mm and the angle steel is 20 multiplied by 3mm and is welded on the lower eave of the roof template;
the linear control construction method for the precast beam top plate is characterized by comprising the following steps of (1) carrying out linear control construction on the precast beam top plate; the method for manufacturing and installing the cross slope graduated scale comprises the following steps:
measuring the horizontal distance between the inner side of a side form stand column and the center line of the precast beam in the same section as the calculated width of a cross slope, calculating the required height difference according to each adjusted 1% of the cross slope, drawing a graduated scale according to the accuracy of 0.1%, and setting the cross slope range value of the graduated scale according to the requirements of different bridges;
after the template trial assembly is completed, measuring the template cross slope by using a level gauge, and adjusting the precast beam template cross slope to a standard cross slope (generally 2%) through level control; and then, a magnetic horizontal ruler is used for flatly pasting the side mould stand column, an angle steel measuring point is tightly leaned, a leveling bubble is adjusted to be centered, a transverse line is drawn above the horizontal ruler, and the graduated scale is pasted on the side mould stand column after being aligned with the transverse line according to the standard transverse gradient.
The linear control construction method for the precast beam top plate is characterized by comprising the following steps of (1) carrying out linear control construction on the precast beam top plate; in step 3, beam top cross slope parameter parameters are determined according to the following method:
and according to the pile number and the framing position of the bridge where the precast beam is located, corresponding to the bridge cross slope and the ultrahigh variation data in the design drawing, and calculating and determining the beam top cross slope parameters corresponding to the pile number according to the position of each side form stand column.
The invention has the following advantages: the invention provides a linear control construction method for a precast beam top plate through improvement; the construction method is suitable for prefabricating bridges with flange plates, such as T-shaped beams, box beams and the like. The method has the following characteristics:
(1) the devices such as the plane linear adjustment of the precast beam, the beam top cross slope adjustment scale and the like are easy to process and convenient to install;
(2) compared with the traditional method for measuring and adjusting the beam top cross slope by using a level gauge, the method is more convenient and safer, and reduces the construction and measurement cost;
(3) the method has the advantages of simple and quick operation, high template control precision, capability of greatly improving the linear quality of the top plate of the precast beam, no cross interference with template installation and construction and the like;
(4) the bridge deck pavement structure can effectively prevent the precast beams from invading the bridge deck pavement structure layer due to insufficient linear control of the precast beam top plate, the quality problems that the width of the joints between the precast beams of adjacent bridge spans is different, the side lines of the bridge are not in accordance with the design linear requirement and the like, and the safety risk of the bridge structure caused by the quality problems is reduced.
Drawings
FIG. 1 is a flow chart of the construction process for controlling the alignment of the top plate of the precast beam according to the present invention;
FIG. 2 is a plan view of a flat curve section precast beam and a bridge;
FIG. 3 is a plan view of a precast beam end inclination adjusting device (a center beam end inclination adjusting device configuration diagram on the left side, and a side beam end inclination adjusting device configuration diagram on the right side);
FIG. 4 is a structural view of a beam-end inclination adjusting apparatus;
FIG. 5 is a front view of the card slot;
FIG. 6 is a view showing the structure of the adjusting device for the outer edge line shape of the top plate of the side sill (T-shaped beam);
FIG. 7 is a view showing the structure of the adjusting device for the outer edge line shape of the roof panel of the side sill (a view showing the structure of the adjusting device for the outer edge line shape of the roof panel of the side sill of the box girder);
FIG. 8 is a schematic view of the adjustment device for the edge line shape of the top plate of the side sill (a schematic view in FIG. 6);
FIG. 9 is a schematic illustration of bridge framing and deck cross-slope;
FIG. 10 is a beam top cross slope adjustment scale device (T-beam top adjustment scale device);
FIG. 11 is a roof cross slope adjustment scale device (box girder roof adjustment scale device);
FIG. 12 is a view showing a large scale B in FIG. 11;
FIG. 13 is a cross slope scale decal effect diagram (left side template cross slope scale);
FIG. 14 is a cross-slope scale sticker effect diagram (right side template cross-slope scale);
FIG. 15 is a bridge plan graph;
fig. 16 is a precast beam cantilever parameter diagram.
Wherein: the steel ball type cross slope angle measuring device comprises a full-threaded screw rod 1, a hexagon nut 2, a hill-shaped nut 3, a punching steel plate 4, a clamping groove 5, a steel ball 6, a beam end plug plate 7, a full-threaded screw rod 8, a punching steel plate 9, a hill-shaped nut 10, a hexagon nut 11, a side beam side baffle 12, a cross slope scale 13, angle steel 14, an angle steel measuring point 15, a magnetic level ruler 16, a side mold stand column 17, a top plate mold plate 18 and a cross slope adjusting screw rod 19.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 16, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a linear control construction method for a precast beam top plate through improvement; the method is suitable for prefabricating bridges with flange plates, such as T-shaped beams, box beams and the like.
The method has the following characteristics:
(1) the devices such as the plane linear adjustment of the precast beam, the beam top cross slope adjustment scale and the like are easy to process and convenient to install;
(2) compared with the traditional method for measuring and adjusting the beam top cross slope by using a level gauge, the method is more convenient and safer, and reduces the construction and measurement cost;
(3) the method has the advantages of simple and quick operation, high template control precision, capability of greatly improving the linear quality of the top plate of the precast beam, no cross interference with template installation and construction and the like;
(4) the bridge deck pavement structure can effectively prevent the precast beams from invading the bridge deck pavement structure layer due to insufficient linear control of the precast beam top plate, the quality problems that the width of the joints between the precast beams of adjacent bridge spans is different, the side lines of the bridge are not in accordance with the design linear requirement and the like, and the safety risk of the bridge structure caused by the quality problems is reduced.
The process principle is as follows: the end part of the precast beam is provided with a plug plate of the beam top plate which is of a structure rotating by taking the center of the beam end as a vertical axis, and the plane position of the plug plate of the beam top plate is controlled by respectively installing 1 adjusting device at the two sides of the precast beam so as to adjust the inclination of the top plate at the beam end. The side baffle of the precast beam is arranged above the boundary beam template of the bridge to be a structure capable of moving along the bridge in the transverse direction, and the plane position of the side baffle is controlled by installing 1 adjusting device at each fixed distance along the length direction of the precast beam so as to adjust the outer edge line shape of the boundary beam. Before prefabricating the bridge, firstly drawing a plane relation graph of the precast beam and the bridge by software such as AutoCAD (auto computer aided design), measuring the sizes of cantilevers corresponding to all adjusting devices on the outer edge of the boundary beam and the sizes and directions of plug plates corresponding to beam end adjusting devices, and adjusting the side baffles and the plug plates to the designed positions when the template is installed, so that the plane line shape of the top plate of the precast beam meets the line shape requirement of the design.
The angle steel measuring point is arranged on the lower brim of the prefabricated beam top plate template, the magnetic level ruler is installed, the cross slope scale ruler is accurately pasted on the corresponding position on the beam template stand column, the designed cross slope of the prefabricated beam top is calculated before the bridge is prefabricated, and the beam top cross slope adjusting screw is adjusted to the angle steel measuring point to be tightly attached to the level ruler installed at the designed cross slope scale, so that the beam top cross slope of the prefabricated beam meets the design requirement.
As shown in FIG. 1, the construction process flow and the operation key points of the invention are as follows;
1) designing and installing a top plate plane linear control device:
referring to fig. 2, the precast girders installed at both sides of the bridge are called as side girders and the precast girders located between the two side girders are called as center girders, which are divided according to the plane positions of the precast girders in the same bridge. In the control of the top plate plane line shape of the precast beam, the middle beam only relates to the control of the beam end inclination, and the edge beam controls the top plate outer edge line shape according to the designed bridge edge line besides controlling the beam end inclination. Therefore, the plane linear control device for the precast beam top plate mainly comprises two devices of beam end inclination adjustment and edge beam top plate outer edge linear adjustment.
(1) Designing and manufacturing a beam end inclination adjusting device:
as shown in fig. 3-5, the beam end inclination adjusting device is composed of a full-thread screw 1, a hexagon nut 2, a hill-shaped nut 3, a perforated steel plate 4, a clamping groove 5, a steel ball 6, a beam end blanking plate 7 and the like; the diameter of the full-thread screw rod 1 is phi 22mm, 1 steel ball 6 with the diameter phi 30mm is arranged at the end head of the full-thread screw rod, and the screw rod 1 at the end of the steel ball 6 is arranged in a clamping groove 5 at the outer side of the beam-end plug plate 7 to form a hinged fulcrum; the clamping groove 5 is made of 8# channel steel, is 100mm high, is provided with an opening at the upper part (shown in figure 5), and is welded and connected with the outer side of the beam end plug plate 7; the thickness of the perforated steel plate is 4 mm, the perforated steel plate is perpendicular to the screw rod 1 and is welded on a top plate template 18 at the end of the precast beam; hexagonal nut 2, chevron nut 3 are installed on full silk screw rod 1 and are distributed in 4 both sides of punching the steel sheet, and screw rod 1 with punch and connect the clamping through hexagonal nut 2, chevron nut 3 between the steel sheet 4, through rotatory hexagonal nut 2, chevron nut 3 control blanking plate 7 and the 1 length of screw rod between the steel sheet 4 that punches during the use, make blanking plate 7 remove to the design position.
(2) The design and the system of the edge beam top plate outer edge linear adjusting device are as follows:
referring to fig. 6-8, the adjusting device for the outer edge line shape of the top plate of the boundary beam comprises a full-thread screw 8, a perforated steel plate 9, a hill-shaped nut 10, a hexagon nut 11 and the like. The diameter of the full-thread screw rod 8 is phi 22mm, and the end head of the full-thread screw rod is vertically welded on the side baffle 12 of the boundary beam; the perforated steel plate 9 is 8mm thick, is vertical to the screw 8 and is welded on the side die upright post 17; hexagonal nut 11, chevron nut 10 are installed on full screw rod 8 and are distributed in the steel sheet 9 both sides that punch, and through hexagonal nut 11, chevron nut 10 connection clamping between full screw rod 8 and the steel sheet 9 that punches, through rotatory hexagonal nut 11 and chevron nut 10 control side shield 12 and the screw rod 8 length between the steel sheet 9 that punches during the use, make boundary beam side shield 12 remove to the design position.
The planar linear adjusting device is arranged corresponding to the prefabricated beam side mold upright post 17.
2) Beam top cross slope adjusting scale device
As shown in fig. 9, the bridge has a bridge deck transverse gradient of i%, the bridge on the flat curve mostly has the ultrahigh change characteristics that the bridge deck transverse gradient and the slope direction change, and the transverse gradient of the top of the precast beam is always consistent with the bridge deck transverse gradient. The beam top cross slope adjusting and scaling device is characterized in that a cross slope scale 13 is additionally arranged on a prefabricated beam side die stand column 17, an angle steel measuring point 15 is arranged on the lower brim of a top plate template, after the positioning is carried out by adopting a magnetic level ruler method, an existing cross slope adjusting screw rod is adjusted to enable the angle steel measuring point 15 to be tightly attached to a level ruler 16, and therefore the beam top meets the requirement of designing the cross slope. The device is respectively provided with 1 part at two sides of a template according to the position of each side die stand column 17 along the length direction of a precast beam, and meets the requirements of strength and rigidity required by precast beam top plate concrete pouring.
According to the advancing direction of the route, the bridge positioned on the left side of the center line of the road is called a left bridge, and the bridge positioned on the right side of the center line of the road is called a right bridge. For convenience of construction management, according to the left side and the right side of the bridge, the cross slope is a positive value when ascending, and the cross slope is a uniform mark of a negative value when descending.
As shown in fig. 10-12, the beam top cross slope adjustment scale device is composed of a cross slope scale 13, an angle steel measuring point 15, a magnetic level bar 16 and the like. The angle steel measuring point adopts angle steel 14 with the length of 100mm and the length of 20 multiplied by 3mm, and the angle steel measuring point is welded on the lower eave of the roof template 18.
And measuring the horizontal distance between the inner side of the side die stand column 17 in the same section and the central line of the precast beam as the calculated width of the cross slope, calculating the required height difference according to each adjusted 1% of the cross slope, drawing a graduated scale 13 (see figures 13 and 14) according to the accuracy of 0.1%, and setting the range value of the cross slope of the graduated scale 13 according to the requirements of different bridges.
After the template trial assembly is completed, the template cross slope is measured by a level gauge, and the precast beam template cross slope is adjusted to a standard cross slope (generally 2%) through level control. Then, a magnetic horizontal ruler 16 is used for flatly pasting the side mold upright post 17, the angle steel measuring point 15 is tightly leaned, the leveling bubble is adjusted to be centered, a transverse line is drawn above the horizontal ruler 16, and the graduated scale 13 is pasted on the side mold upright post 17 after being aligned with the transverse line according to the standard transverse gradient.
after the precast beam template arrives at the field, the template is firstly assembled and inspected.
1) When the templates are assembled, each design size of the templates is strictly checked again, and the size, the joint, the strength, the rigidity and the like of the templates are ensured to meet the construction requirements.
2) After the templates are assembled, parameters required by beam top plate linear control are measured and recorded, and a top plate linear adjusting device is installed.
1) determining a linear control parameter of a top plate plane;
(1) and searching and recording bridge flat curve parameters through a design drawing.
(2) And (3) establishing a new project in the latitude and land software, inputting bridge flat curve parameters, and generating a CAD (computer-aided design) graph of the bridge flat curve as shown in the figure 15.
(3) And (3) introducing plane coordinates of structures such as bent cap, precast beam and the like in the bridge design drawing and bridge width data into a flat curve CAD drawing, and drawing a plane relation drawing of the precast beam and the bridge in a flat curve section as shown in figure 2.
(4) And measuring the length of each precast beam, the inclination of the beam end and the cantilever parameters of the middle beam and the boundary beam corresponding to each adjusting device.
Firstly, the length of the precast beam refers to the length of the beam on the center line, and the width of the precast beam joint between bridge spans is reduced according to the design.
Secondly, as shown in fig. 2, after the values of the & lt alpha & gt and & lt beta & gt are obtained from the relation graph of the precast beam and the bridge plane, the adjustment distance x value of the beam end plug plate 7 is calculated and is shown in fig. 3.
③ the denser the cantilever parameter points, the more smooth the line shape, taking one cantilever parameter according to the position of each side form upright post 17 after comprehensively considering the convenience of site construction and the overall line shape effect, as shown in fig. 16, the cantilever parameters are divided into left side beam cantilever parameters and right side beam cantilever parameters according to the advancing direction of the route, and respectively take CZ (CZ) i And CY i And (4) showing. As shown in FIGS. 6 and 7, from CZ i 、CY i The value is further calculated to calculate the distance SZ between the inner side of the side baffle 5 (or the comb plate) and the side mould upright post 17 i And SY i The outer edge line of the top plate of the side beam is convenient to measure and adjust by taking the upright post 17 as a reference point.
And fourthly, filling a linear parameter record table of the top plate of the precast beam for later use.
2) Determining beam top cross slope parameters
And according to the pile number and the framing position of the bridge where the precast beam is located, corresponding to the bridge cross slope and the ultrahigh variation data in the design drawing, calculating the beam top cross slope parameters corresponding to the pile number according to the position of each side form upright post, and filling a precast beam top plate linear parameter record table.
the corrugated pipe and the reinforcing steel bar are manufactured according to the designed length. When the corrugated pipe is connected for a long time, the joint is tightly wound by using an adhesive tape to prevent slurry leakage. The steel bar joint adopts arc welding, and the overlapping length is not less than the standard requirement.
1) mounting process flow;
(1) a T beam: installing a horseshoe and a web steel bar → installing a corrugated pipe → installing a template → adjusting the linear shape of a top plate → installing the steel bar of the top plate → the next procedure.
(2) A box girder: installing bottom plate and web steel bar → installing corrugated pipe → installing core mold and side mold → linear adjustment of top plate → installing top plate steel bar → next procedure
2) Construction requirements;
(1) the stressed steel bar welding or binding joint is arranged at the position with smaller internal force and is arranged in a staggered manner. And when the reinforcing steel bars and the corrugated pipe are in cross interference, the reinforcing steel bars are adjusted according to the principle of avoiding the corrugated pipe.
(2) And arranging the prestressed pipeline according to the design coordinate, and installing the corrugated pipe positioning steel bar.
(3) The steel bar protective layer cushion blocks are arranged on the steel bars in a quincunx shape.
(4) When the template is assembled, the hanging wire is straightened, and the upper opening and the end part of the template are fixed by using the counter pull rod.
(5) After the template is installed, a web plate and a blanking plate 7 at the lower part of the web plate are accurately installed according to the calculated length size of the precast beam, and the beam end inclination, the top plate edge line and the beam top transverse gradient of the precast beam are adjusted according to the top plate linear parameter table.
Firstly, the knobs of all devices are sequentially rotated, and the inclination of the beam end and the edge position of the top plate are adjusted one by one according to data listed in the parameter table, so that the top plate of the precast beam meets the linear requirement of a design plane.
Secondly, finding the designed cross slope position on the cross slope graduated scale 13, and correspondingly placing a magnetic level bar 16 to level the cross slope position. The knob of the cross slope adjusting device is rotated to make the angle steel measuring point 15 tightly attached to the level ruler 16.
(6) And (4) installing the top plate steel bars, and carrying out template and steel bar review and inspection to ensure that the installation meets the design requirements.
1) after the concrete is transported to the site by a tank truck, a gantry crane lifts a discharge hopper and enters a mold, and a high-frequency attached vibrator vibrates and is matched with an inserted vibrating rod to tamp.
2) And after the concrete pouring is finished, beam top leveling and surface folding work are well carried out, and then covering and curing are carried out in time.
1) when the form is removed, the upper and lower tie rods and the cross arm are loosened, and then the bolts between the forms are loosened to separate the forms from the beam body.
2) And after the mould is removed, roughening the part needing to be poured with the secondary concrete in time.
3) And the size and the line shape of the precast beam are checked, so that the deviation correction is facilitated during subsequent construction.
The benefit of the present invention was analyzed as follows;
(1) economic benefits are as follows: compared with the traditional roof linear control scheme, the roof linear control construction scheme has the advantages of less labor investment, short installation time and cost and time saving (see table 1).
Table 1 cost comparison table for different schemes of each casting of a beam
As can be seen from Table 1, the cost of the traditional cross slope control scheme for pouring one beam is about 3900 yuan, the cost of the top plate linear control scheme is about 2500 yuan, the cost is saved by about 1400 yuan, and the time is saved by about 1 hour. The method mainly comprises the following steps that a traditional top plate linear control scheme needs to measure and adjust a template by a level gauge before each pouring, work efficiency is low, engineering progress is seriously influenced, and a scheme of adopting a beam top cross slope adjusting and scaling device can accurately adjust the beam top cross slope of the precast beam in a scaling mode; the top plate plane linear control scheme can be used for quickly positioning the cantilever position of the precast beam, so that the construction time is saved, the adjustment precision is improved, and the economic benefit and the practicability are obvious.
(2) Social benefits are as follows: the linear control construction method for the top plate of the precast beam is a technical innovation in the precast beam construction process, and has a good application prospect in the field of flat-curve section bridge engineering construction.
The novel technology can accurately and quickly adjust the line shape of the top plate of the precast beam, improves the construction efficiency, effectively prevents the precast beam from invading into a bridge deck pavement structure layer and quality problems that the width of a seam between precast beams of adjacent bridge spans is different, the side line of the bridge does not accord with the line shape requirement of design and the like caused by insufficient line shape control of the top plate of the precast beam, and reduces the safety risk of the bridge structure brought by the quality problems. The technology is safe and environment-friendly in application, and has good social benefits and practical value.
Engineering example: a Lien Yangshan New City road LJ15 standard section for construction carried out by the Limited liability company of Sichuan navigation construction engineering is located in the town of Yanshan county of Yibin City, and the standard section is provided with 3 bridges such as a Zhongdu river super bridge, a Huangjue dam bridge and a water drainage post bridge, wherein the Zhongdu river super bridge and the Huangjue dam bridge are flat curve section bridges with small radius and large radian. In the bridge prefabricating process, the project part carries out innovative transformation on a precast beam template, and a beam end inclination adjusting device, a side beam top plate outer edge linear adjusting device, a beam top cross slope adjusting and scaling device and the like are designed and manufactured for precast beam top plate linear control, so that the precast beam top plate linear control construction method is formed. After the construction method is adopted, the line shape of the top plate of the precast beam is obviously improved, the construction procedure is simplified, and the operation is simple, convenient and quick. The construction method accelerates the engineering progress and is beneficial to improving the appearance quality of the bridge. After the construction method is implemented, the linear effect of the LJ15 standard precast beam roof is commented by companies, owners and supervisors.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A linear control construction method for a precast beam top plate is characterized in that; the construction process flow is as follows;
step 1, construction preparation:
1) designing and installing a top plate plane linear control device: the plane linear control device of the precast beam top plate mainly comprises two devices of beam end inclination adjustment and edge beam top plate outer edge linear adjustment;
2) designing and manufacturing a beam top cross slope adjusting scale device;
step 2, realizing the assembling and checking operation of the precast beam template;
step 3, determining linear parameters of the top plate; determining a top plate plane linear control parameter and a beam top cross slope parameter;
step 4, manufacturing the precast beam steel bars and the corrugated pipes;
step 5, realizing the installation operation of the precast beam steel bars, the corrugated pipes and the templates; the template installation comprises the operations of top plate cross slope adjustment, beam end inclination adjustment, edge beam outer edge line adjustment and the like of the precast beam;
step 6, pouring operation of the precast beam is achieved;
step 7, realizing the operation of demoulding and dimension checking of the precast beam;
step 8, realizing the maintenance operation of the beam body;
step 9, realizing prestress construction operation;
and step 10, realizing the operation of moving, transporting and installing the precast beam.
2. The precast beam top plate alignment control construction method according to claim 1, wherein; in step 3, the linear control parameters of the top plate plane are determined according to the following method:
searching and recording bridge flat curve parameters through a design drawing, and generating a bridge flat curve CAD drawing by using software; introducing plane coordinates of structures such as bent cap, precast beam and the like and bridge width data in a bridge design drawing into a flat curve CAD drawing, and drawing a plane relation drawing of the precast beam and the bridge in a flat curve section;
and measuring and determining the length and the inclination of the beam end of each precast beam and the cantilever parameters of the center beam and the edge beam corresponding to each adjusting device in the AutoCAD.
3. The precast beam top plate alignment control construction method according to claim 1, wherein; in the step 1, the beam end inclination adjusting device is structurally provided with a full-thread screw (1), a hexagon nut (2), a mountain nut (3), a punching steel plate (4), a clamping groove (5), a steel ball (6) and a beam end plug plate (7); the diameter of the full-thread screw (1) is 22mm, 1 steel ball (6) with the diameter of 30mm is arranged at the end of the full-thread screw, and the screw (1) at the end of the steel ball (6) is arranged in a clamping groove (5) at the outer side of the beam-end plug plate (7) to form a hinged fulcrum; the clamping groove (5) is made of 8# channel steel, is 100mm high, is opened at the upper part and is welded and connected with the outer side of the beam end plug plate (7); the thickness of the perforated steel plate (4) is 8mm, and the perforated steel plate is perpendicular to the screw rod (1) and welded on a top plate template (18) at the end of the precast beam; hexagonal nut (2), mountain-shaped nut (3) are installed on full-thread screw rod (1) and are distributed in punching steel sheet (4) both sides, screw rod (1) with punch between steel sheet (4) through hexagonal nut (2), mountain-shaped nut (3) connect the clamping, through rotatory hexagonal nut (2), mountain-shaped nut (3) control end plug board (7) and punch screw rod (1) length between steel sheet (4) during the use, make end plug board (7) remove to the design position.
4. The precast beam top plate alignment control construction method according to claim 1, wherein; in the step 1, the adjusting device for the outer edge line shape of the edge beam top plate is structurally provided with a full-thread screw rod (8), a punching steel plate (9), a mountain-shaped nut (10), a hexagonal nut (11) and an edge beam side baffle (12); the diameter of the full-thread screw (8) is phi 22mm, and the end of the full-thread screw is vertically welded on the side baffle (12) of the boundary beam; the thickness of the perforated steel plate (9) is 8mm, is vertical to the screw rod (8) and is welded on the side die upright post (17); hexagonal nut (11), mountain-shaped nut (10) are installed on full screw rod (8) and are distributed in punching steel sheet (9) both sides, through hexagonal nut (11), mountain-shaped nut (10) connection clamping between full screw rod (8) and punching steel sheet (9), through rotatory hexagonal nut (11) and mountain-shaped nut (10) control side shield (12) and screw rod (8) length between punching steel sheet (9) during the use, make boundary beam side shield (12) remove to the design position.
5. The precast beam top plate alignment control construction method according to claim 1, wherein; in the step 1, the beam top cross slope adjusting and scaling device is structurally provided with a cross slope scale (13), angle steel (14), an angle steel measuring point (15) and a magnetic level ruler (16); a cross slope graduated scale (13) is additionally arranged on a prefabricated beam side mold upright post (17), an angle steel measuring point (15) is arranged on the lower brim of a top plate template (18), and after the prefabricated beam side mold upright post is positioned by adopting a magnetic level bar method, an existing cross slope adjusting screw rod (19) is adjusted to enable the angle steel measuring point (15) to be tightly attached to a level bar (16), so that the beam top meets the requirement of designing the cross slope; the device is provided with 1 part on each side of a template according to the position of each side form upright post (17) along the length direction of a precast beam, and meets the requirements of strength and rigidity required by precast beam top plate concrete pouring;
according to the advancing direction of the route, a bridge positioned on the left side of the center line of the road is called a left bridge, and a bridge positioned on the right side of the center line of the road is called a right bridge;
for convenience of construction management, according to the left side and the right side of the bridge, the cross slope is a positive value when ascending, and the cross slope is a uniform mark of a negative value when descending.
6. The precast beam top plate alignment control construction method according to claim 5, wherein; the angle steel measuring point (15) is welded to the lower eave of the roof template (18) by angle steel (14) with the length of 100mm and the angle steel is 20 multiplied by 3 mm.
7. The precast beam top plate alignment control construction method according to claim 5, wherein; the manufacturing and mounting method of the cross slope graduated scale (13) is as follows:
measuring the horizontal distance between the inner side of a side die stand column (17) in the same section and the central line of the precast beam as the calculated width of a cross slope, calculating the required height difference according to each adjusted 1% of the cross slope, drawing a graduated scale (13) according to the accuracy of 0.1%, and setting the cross slope range value of the graduated scale (13) according to the requirements of different bridges;
after the template trial assembly is completed, measuring the cross slope of the template (18) by using a level gauge, and adjusting the cross slope of the precast beam template (18) to a standard cross slope (generally 2%) by level control; and then, a magnetic horizontal ruler (16) is used for flatly attaching the side mold upright post (17), the angle steel measuring point (15) is tightly leaned, the leveling bubble is adjusted to be centered, a transverse line is drawn above the horizontal ruler (16), and the graduated scale (13) is aligned to the transverse line according to the standard transverse gradient and then is attached to the side mold upright post (17).
8. The precast beam top plate alignment control construction method according to claim 1, wherein; in step 3, beam top cross slope parameter parameters are determined according to the following method:
and according to the pile number and the framing position of the bridge where the precast beam is located, corresponding to the bridge cross slope and ultrahigh variation data in the design drawing, and calculating and determining the beam top cross slope parameters corresponding to the pile number according to the position of each side form stand column (17).
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| CN111576232B (en) | 2022-03-04 |
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