A device for pre-burying and positioning an anchor tube of a cable stayed bridge and its using method

Abstract

The present invention provides a pre-buried positioning device for a cable-stayed cable anchor tube of a bridge and its usage method. Adopting the BIM full three-dimensional design concept, considering factors such as the self-weight of the anchor tube, the structural configuration of the anchor tube itself, and the longitudinal and transverse slopes of the position where the cable-stayed cable anchor block is located, by setting temporary structures at certain positions below the anchor backing plate at the bottom of the anchor tube, on both sides, and at the front end of the anchor tube, to achieve the rapid and accurate positioning of the cable-stayed cable anchor tube on the cast-in-place box girder of the cable-stayed bridge, and solve the problems of inaccurate positioning of the anchor tube with a large self-weight, a long length, and a large number of welded steel bars on the surface, or easy deviation during construction due to insecure reinforcement, and inaccurate positioning of the anchor tube caused by temperature influence. It belongs to the field of construction engineering.

Description

Technical Field

[0001] The present invention relates to a pre-embedded positioning device for a cable-stayed bridge stay cable anchor tube and a using method thereof, which is particularly suitable for controlling the elevation, left and right deviation, and angular direction during the pre-embedding of the cable-stayed bridge stay cable anchor tube before the casting of the beam body concrete, and belongs to the field of construction engineering. Background Art

[0002] At present, with the increasing maturity of bridge construction technology in China, the cable-stayed bridge construction technology has developed by leaps and bounds. However, during the construction process of pre-embedding and positioning the cable-stayed bridge stay cable anchor tube before the casting of the main bridge cast-in-place box girder concrete, it is mainly affected by the position of the vertical poles of the support erection, the stiffness of the formwork, the longitudinal and transverse slopes of the beam body, the slope of the anchor end, the self-weight of the anchor tube, the temperature, etc., which brings certain difficulties to the accurate positioning of the anchor tube pre-embedding. Especially for the anchor tube with a large self-weight, a long length, and a large number of steel bars welded on the surface, there are problems such as inaccurate positioning, or it is easy to deviate during the construction process due to insufficient reinforcement, and the anchor tube positioning is inaccurate due to the influence of temperature. Summary of the Invention

[0003] The present invention provides a pre-embedded positioning device for a cable-stayed bridge stay cable anchor tube and a using method thereof to achieve the rapid and accurate positioning of the cable-stayed bridge stay cable anchor tube on the cast-in-place box girder, and solve the problems of inaccurate positioning of the anchor tube with a large self-weight, a long length, and a large number of steel bars welded on the surface, or it is easy to deviate during the construction process due to insufficient reinforcement, and the anchor tube positioning is inaccurate due to the influence of temperature.

[0004] To achieve the above object, a pre-embedded positioning device for a cable-stayed bridge stay cable anchor tube is proposed, which includes an anchor tube bottom formwork arranged at the bottom of the designed position of the anchor tube. The anchor tube bottom steel plate is attached to the anchor tube bottom formwork. A No. 1 angle steel is arranged along the lower side of the anchor tube bottom steel plate, and the No. 1 angle steel is fixed on the anchor tube bottom formwork. The bottom of the anchor tube bottom formwork is fixedly provided with a No. 2 angle steel along the full length direction, and the No. 1 angle steel and the No. 2 angle steel are fixedly connected by a plurality of support steel bars arranged in a distributed manner. An anchor tube support is also arranged at the upper end of the designed position of the anchor tube. The anchor tube support includes a horizontal bar for erecting the upper end of the anchor tube. The horizontal bar is a height-adjustable structure, and the horizontal bar protrudes more than 10 cm above the box girder structure surface.

[0005] In the foregoing positioning device, No. 3 angle steel and No. 4 angle steel are respectively arranged on both sides and the upper side of the anchor tube bottom steel plate, and the four side surfaces of the anchor tube bottom steel plate are fixedly connected to the anchor tube bottom formwork through the No. 1 angle steel, No. 3 angle steel, and No. 4 angle steel respectively;

[0006] In the foregoing positioning device, the anchor tube support further includes two vertical poles and an inclined bar. The two vertical poles are respectively arranged at both ends of the horizontal bar. The two ends of the horizontal bar are fixedly connected to the two ends of the vertical poles through fasteners. The inclined bar is arranged obliquely and the upper end is fixed in the middle of the horizontal bar.

[0007] The specific construction method is as follows:

[0008] (1) Measurement and setting out

[0009] According to the precision requirements of the embedded anchor barrel, the center line and center point of the lower anchor point of the stay cable are released on the bottom formwork of the anchor barrel by using the total station three-dimensional coordinate method. The four peripheral lines of the bottom steel plate of the anchor barrel are divided according to the measured center point and marked. The center point position of the anchor barrel is measured on the thin steel plate welded at the top pipe orifice of the anchor barrel;

[0010] (2) Installation and positioning of the device

[0011] 1) Installation of the angle steel at the bottom of the anchor barrel:

[0012] ① Press the No. 1 angle steel against the bottom peripheral line of the bottom steel plate of the anchor barrel and pre-fix the angle steel;

[0013] ② Arrange the No. 2 angle steel along the bottom of the bottom formwork of the anchor barrel;

[0014] ③ Support steel bars are arranged between the No. 1 angle steel and the No. 2 angle steel, and the two ends of the support steel bars are welded firmly to the No. 1 angle steel and the No. 2 angle steel respectively;

[0015] 2) Erection of the anchor barrel support:

[0016] ① The anchor barrel support is erected with ordinary steel pipes and consists of two vertical poles, one horizontal pole and one inclined pole. The poles are connected by fasteners;

[0017] ② The position of the vertical poles is determined according to the actual situation on site. First, erect the two vertical poles, then erect the horizontal pole, and finally erect the inclined pole. It is required that the horizontal pole protrudes more than 10 cm above the top surface of the box girder structure;

[0018] (3) Hoisting, positioning and reinforcement of the anchor barrel

[0019] 1) Hoisting and positioning of the anchor barrel

[0020] ① Use the hoisting equipment to hoist the bottom of the anchor barrel above the No. 1 angle steel and place the upper part on the horizontal pole;

[0021] ② Use the height of the horizontal pole to preliminarily adjust the inclination angle of the anchor barrel to the designed position;

[0022] 2) Reinforcement of the bottom of the anchor barrel

[0023] After the anchor barrel is hoisted in place, install the No. 3 angle steel to reinforce both sides of the bottom steel plate of the anchor barrel. If there is a gap between the bottom steel plate of the anchor barrel and the bottom formwork of the anchor barrel, the No. 3 angle steel is arranged along the whole length and the No. 4 angle steel is added;

[0024] (4) Fine adjustment of the anchor barrel angle

[0025] After the bottom of the anchor barrel is firmly reinforced, the height of the adjusting horizontal bar is used again to adjust the angle of the anchor barrel. Fine-tune the angle according to the on-site survey data. After the angle is adjusted in place, use fasteners to fix the horizontal bar on the vertical bar at the elevation position.

[0026] Compared with the prior art, the structure of the pre-embedded positioning device of the present invention is very simple. Generally, there are materials and equipment such as angle steel, steel bars, steel pipes, cranes, tower cranes, etc. at the construction site. It can be quickly processed using the materials and tools at the construction site, with low production cost, strong on-site implementability, and high construction safety. Using this positioning device and method, the anchor barrel can be quickly and accurately positioned, with high positioning accuracy, not easily affected by the construction environment and conditions, and not easily deviated. It has good practicability and popularization in the positioning construction of similar bridge pre-embedded parts, and has been practically applied in many projects with remarkable effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural view of the present invention after installing the anchor barrel;

[0028] Figure 2 is a schematic structural view of the positioning at the bottom of the anchor barrel;

[0029] Figure 3 is a schematic structural view of the anchor barrel bottom steel plate installed on the bottom formwork of the anchor barrel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Embodiment

[0032] Refer to Figures 1 to 3 , this embodiment provides a pre-embedded positioning device for a cable-stayed bridge anchor barrel, including an anchor barrel bottom formwork 1 arranged at the bottom of the designed position of the anchor barrel 2. The anchor barrel bottom steel plate 3 is attached to the anchor barrel bottom formwork 1. A 1# angle steel 4 is arranged along the lower side of the anchor barrel bottom steel plate 3, and the 1# angle steel 4 is fixed on the anchor barrel bottom formwork 1. A 2# angle steel 5 is fixedly arranged along the entire length direction at the bottom of the anchor barrel bottom formwork 1, and the 1# angle steel 4 and the 2# angle steel 5 are fixedly connected by a plurality of support steel bars 6 arranged in a distributed manner. 3# angle steel 8 and 4# angle steel 9 are respectively arranged on both sides and the upper side of the anchor barrel bottom steel plate 3. The four side surfaces of the anchor barrel bottom steel plate 3 are fixedly connected to the anchor barrel bottom formwork 1 through the 1# angle steel 4, 3# angle steel 8 and 4# angle steel 9.

[0033] At the upper end of the designed position of the anchor barrel 2, there is also an anchor barrel support 7. The anchor barrel support 7 includes a horizontal rod 71 for supporting the upper end of the anchor barrel 2, and also includes two vertical rods 72 and an inclined rod 73. The horizontal rod 71 is a height-adjustable structure, and the horizontal rod 71 protrudes more than 10 cm above the box girder structure surface. The two vertical rods 72 are respectively arranged at both ends of the horizontal rod 71, and both ends of the horizontal rod 71 are fixedly connected to the two vertical rods 72 through fasteners, so as to adjust the height position of the horizontal rod 71 fixed on the vertical rods 72. The inclined rod 73 is obliquely arranged and its upper end is fixed to the middle of the horizontal rod 71.

[0034] The specific construction method is as follows:

[0035] (1) Measurement and layout

[0036] According to the accuracy requirements of the anchor barrel 2 embedding, the center line and center point of the cable-stayed cable lower anchor point are released on the bottom formwork 1 of the anchor barrel by using the total station three-dimensional coordinate method. The four peripheral lines of the bottom steel plate 3 of the anchor barrel are separated according to the measured center point and marked, and the center point position of the anchor barrel 2 is measured on the thin steel plate welded at the top pipe orifice of the anchor barrel 2;

[0037] (2) Installation and positioning of devices

[0038] 1) Installation of the angle steel at the bottom of the anchor barrel:

[0039] ① Press the No. 1 angle steel 4 against the bottom edge line of the bottom steel plate 3 of the anchor barrel, and the angle steel can be pre-fixed with steel nails;

[0040] ② Press the No. 2 angle steel 5 against the bottom of the bottom formwork 1 of the anchor barrel and set it along the whole length;

[0041] ③ Vertically arrange 2 supporting steel bars 6 with a specification of 20@30 cm between the No. 1 angle steel 4 and the No. 2 angle steel 5, and both ends of the supporting steel bars 6 are firmly welded to the No. 1 angle steel 4 and the No. 2 angle steel 5 respectively;

[0042] 2) Erection of the anchor barrel support:

[0043] ① The anchor barrel support is erected with ordinary steel pipes and consists of two vertical rods 72, a horizontal rod 71 and an inclined rod 73. The rods are connected by fasteners;

[0044] ② The positions of the vertical rods 72 are determined according to the actual situation on site. First, erect the two vertical rods 72, then erect the horizontal rod 71, and finally erect the inclined rod 73. It is required that the horizontal rod 71 protrudes more than 10 cm above the top surface of the box girder structure;

[0045] (3) Hoisting, positioning and reinforcement of the anchor barrel

[0046] 1) Hoisting and positioning of the anchor barrel

[0047] ① Use a hoisting device to hoist the bottom of the anchor barrel 2 to the upper side of the No. 1 angle steel 4, and place the upper part on the horizontal rod 71;

[0048] ② Use the vertical height of the horizontal rod 71 to initially adjust the inclination angle of the anchor barrel 2 to the designed position;

[0049] 2) Reinforcement at the bottom of the anchor barrel

[0050] After the anchor barrel 2 is hoisted in place, install the No. 3 angle steel 8 to reinforce both sides of the bottom steel plate 3 of the anchor barrel, with a length of 30 cm. If there is a gap between the bottom steel plate 3 of the anchor barrel and the bottom formwork 1 of the anchor barrel, the No. 3 angle steel 8 shall be arranged throughout the length and the No. 4 angle steel 9 shall be added.

[0051] (4) Fine adjustment of the anchor barrel angle

[0052] After the bottom of the anchor barrel 2 is firmly reinforced, use the vertical height of the adjusting horizontal rod 71 to adjust the angle of the anchor barrel again. Make fine adjustments to the angle according to the on-site survey data. After the angle is adjusted in place, fix the horizontal rod 71 on the vertical rod 72 at the corresponding elevation position with fasteners.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Construction method of embedded positioning device for cable-stayed cable anchor tube of bridge It is characterized in that: The device includes an anchor tube bottom formwork (1) arranged at the bottom of the designed position of the anchor tube (2). The anchor tube bottom steel plate (3) is attached to the anchor tube bottom formwork (1). A No. 1 angle steel (4) is arranged along the lower side of the anchor tube bottom steel plate (3), and the No. 1 angle steel (4) is fixed on the anchor tube bottom formwork (1). A No. 2 angle steel (5) is fixed along the whole length direction at the bottom of the anchor tube bottom formwork (1). And the No. 1 angle steel (4) and the No. 2 angle steel (5) are fixedly connected by a plurality of support steel bars (6) arranged distributively. At the upper end of the designed position of the anchor tube (2), an anchor tube support (7) is also arranged. The anchor tube support (7) includes a horizontal bar (71) for erecting the upper end of the anchor tube (2), and the horizontal bar (71) is a height-adjustable structure, and the horizontal bar (71) protrudes more than 10 cm above the box girder structure surface; The construction method of the embedded positioning device for the cable-stayed cable anchor tube of the bridge is specifically operated as follows: (1) Measuring and setting out According to the precision requirements of the embedding of the anchor tube (2), the center line and center point of the lower cable anchor point are released on the anchor tube bottom formwork (1) by using the total station three-dimensional coordinate method. The four side lines of the anchor tube bottom steel plate (3) are divided according to the measured center point and marked. The center point position of the anchor tube (2) is measured on the thin steel plate welded at the top pipe orifice of the anchor tube (2); (2) Device installation and positioning 1) Installation of anchor tube bottom angle steel ① Press the No. 1 angle steel (4) tightly against the bottom side line of the anchor tube bottom steel plate (3), and pre-fix the angle steel; ② Arrange the No. 2 angle steel (5) tightly along the whole length at the bottom of the anchor tube bottom formwork (1); ③ Arrange support steel bars (6) between the No. 1 angle steel (4) and the No. 2 angle steel (5), and the two ends of the support steel bar (6) are respectively welded firmly to the No. 1 angle steel (4) and the No. 2 angle steel (5); 2) Erection of anchor tube support ① The anchor tube support is erected by using ordinary steel pipes and is composed of two vertical rods (72), one horizontal bar (71), and one inclined bar (73). The rods are connected by fasteners; ② The positions of the vertical rods (72) are determined according to the actual situation on site. First, erect the two vertical rods (72), then erect the horizontal bar (71), and finally erect the inclined bar (73). It is required that the horizontal bar (71) protrudes more than 10 cm above the top surface of the box girder structure; (3) Hoisting, positioning and reinforcement of anchor tube 1) Hoisting and positioning of anchor tube ① Use a hoisting device to hoist the bottom of the anchor tube (2) to the upper side of the No. 1 angle steel (4), and place the upper part on the horizontal bar (71); ② Use the up and down height of the horizontal bar (71) to initially adjust the inclination angle of the anchor tube (2) to the designed position; 2) Reinforcement of anchor tube bottom After the anchor tube (2) is hoisted in place, install a No. 3 angle steel (8) to reinforce both sides of the anchor tube bottom steel plate (3). If there is a gap between the anchor tube bottom steel plate (3) and the anchor tube bottom formwork (1), the No. 3 angle steel (8) is arranged along the whole length and a No. 4 angle steel (9) is added; (4) Fine adjustment of anchor tube angle After the bottom of the anchor tube (2) is firmly reinforced, use the up and down height of the adjusting horizontal bar (71) to adjust the angle of the anchor tube again. According to the on-site survey data, make fine adjustments to the angle. After the angle adjustment is in place, fix the horizontal bar (71) on the vertical rod (72) at the corresponding elevation position by using fasteners.

2. The construction method of a construction method for a pre-embedded positioning device of a cable-stayed cable anchor tube of a bridge according to claim 1, characterized in that: On both sides and the upper side of the bottom steel plate (3) of the anchor tube, 3# angle steel (8) and 4# angle steel (9) are respectively arranged, and the four side surfaces of the bottom steel plate (3) of the anchor tube are fixedly connected to the bottom formwork (1) of the anchor tube through 1# angle steel (4), 3# angle steel (8) and 4# angle steel (9).

3. The construction method of a construction method for a pre-embedded positioning device of a cable-stayed cable anchor tube of a bridge according to claim 1, characterized in that: The anchor tube support (7) further includes two vertical rods (72) and an inclined rod (73). The two vertical rods (72) are respectively arranged at both ends of the horizontal rod (71). Both ends of the horizontal rod (71) are fixedly connected to the two end vertical rods (72) through fasteners. The inclined rod (73) is obliquely arranged and its upper end is fixed to the middle of the horizontal rod (71).

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