Arch bridge hanging basket prepressing device

Abstract

The utility model relates to an arch bridge hanging basket pre-pressing device which solves the safety problems that a 0 # section cracks, a hanging basket and a pre-pressing block fall off and the like possibly caused by the adoption of a traditional method. I-shaped steel of the two tower-shaped supports is connected with the two ends of second channel steel respectively, the upper ends of four third channel steel are connected with the middle of the second channel steel, the lower ends of the four third channel steel are connected with the lower ends of the four first channel steel on the inner sides of the two tower-shaped supports respectively, two opposite side faces of the arch bridge hanging basket are vertically symmetrical isosceles triangles, and the other two opposite side faces of the arch bridge hanging basket are obliquely symmetrical rectangles. The top corners of the isosceles triangle are connected with the two ends of the main beam, the bottom edge of the isosceles triangle is connected with the tower-shaped support, and the upper face of the I-shaped steel is connected with the lower face of the main beam through the jack.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hanging basket pre -pressing technical field, especially 1# segment concrete construction's arch bridge hanging basket's pre -pressing device. BACKGROUND

[0002] The cast-in-place arch bridge is one of the most competitive bridge types for crossing deep ditch, river and the like. Due to the influence of the bridge site topography, the hanging basket cantilever casting construction becomes one of the main construction methods. The arch bridge hanging basket is mainly composed of profiled steel, and according to the specification requirements, pre -pressing needs to be carried out. The purpose of the arch bridge hanging basket pre -pressing is mainly to eliminate the inelastic deformation of the hanging basket, determine the elastic deformation (the formwork height is considered by adding the pre-arch value), and secondly, the pre -pressing is also to verify the safety and stability of the arch bridge hanging basket. At present, the common method of conventional hanging basket pre -pressing is to install the hanging basket after the 0# segment concrete construction is completed, and finally, the pre -pressing is carried out under the most unfavorable working condition (1.2 times of the weight of 1# segment) of the whole bridge. Since the weights of the segments of the cast-in-place arch bridge are inconsistent, and the heaviest segment is not 1# segment, if the simulated pre -pressing is carried out on the 0# segment, and the pre -pressing is carried out under the most unfavorable working condition of the whole bridge, due to the excessive pre -pressing weight, the problems such as cracking of the 0# segment, falling of the hanging basket and the pre -pressing block and the like may be caused. In order to overcome the shortcomings of the above construction method, it is necessary to research a device which can simulate the pre -pressing of 1# segment hanging basket, so that the arch bridge hanging basket pre -pressing can adopt the most unfavorable working condition, ensure the pre -pressing safety, and the device has low manufacturing cost and simple structure. SUMMARY

[0003] The utility model aims at providing an arch bridge hanging basket pre -pressing device which can simulate pre -pressing on the abutment and will not cause the 0# segment to crack, the hanging basket and the pre -pressing block to fall.

[0004] The utility model is implemented in this way:

[0005] The arch bridge hanging basket pre -pressing device is characterized in that the lower surface of the I-shaped steel 5 is connected with the upper end of the four first channel steels 1 to form a tower-shaped support, the I-shaped steel 5 of the two tower-shaped supports is connected with the two ends of the second channel steel 4 respectively, the upper end of the four third channel steels 3 is connected with the middle part of the second channel steel 4, and the lower end is connected with the lower end of the four first channel steels 1 in the inner side of the two tower-shaped supports respectively, the two opposite sides of the arch bridge hanging basket 6 are vertical symmetrical isosceles triangles, and the other two opposite sides are oblique symmetrical rectangles, the upper edge of the symmetrical rectangle is connected with the main beam, the top angle of the isosceles triangle is connected with the two ends of the main beam, and the bottom edge of the isosceles triangle is connected with the tower-shaped support, the upper surface of the I-shaped steel 5 is connected with the lower surface of the main beam through the jack 7, the lower edge of one symmetrical rectangle extends above the abutment and is connected with the upper end of the threaded steel 8 through the nut, the lower end of the threaded steel 8 is connected with the nut 11 through the fourth channel steel 10, and the fourth channel steel 10 is connected with the embedded steel bar 9 on the outer side of the abutment. The lower edges of the two symmetrical rectangles are connected to form a bearing frame through a plurality of steel bars.

[0006] The utility model discloses a technical scheme is first need to place the steel structure support device that is composed of channel steel, angle steel, I-beam and jack on the abutment concrete foundation, this device simulates 0# segment concrete, supports arch bridge hanging basket, makes arch bridge hanging basket 50cm from the ground.

[0007] The utility model discloses the beneficial effect

[0008] The utility model discloses a steel structure support, reverse anchor device composition. Use the device to support, reverse anchor to arch bridge hanging basket. By steel structure support and reverse anchor device simulate the support and anchoring effect of the formed 0# segment concrete to arch bridge hanging basket, make arch bridge hanging basket reach simulation construction state.

[0009] First need to place the steel structure support device that is composed of channel steel, angle steel, I-beam and jack on the abutment concrete foundation, support arch bridge hanging basket, make arch bridge hanging basket 50cm from the ground. Secondly set up the reverse anchor device that is composed of steel bar, fine twist steel, channel steel and fine twist steel connector on the abutment concrete foundation, form the back anchor system. Finally by the jack on the steel structure support leveling, carry out preloading. The device is applicable to the preloading of highway, municipal engineering and railway engineering suspension pouring arch bridge hanging basket, and the device has the advantages of low production cost, simple structure, convenient and flexible use and the like.

[0010] Before the device is applied, arch bridge hanging basket generally needs to be preloaded in 0# segment, which is high-altitude operation, and the preloading material (concrete precast block) hoisting, 0# segment concrete and personnel installation all have certain risks.

[0011] The arch bridge hanging basket preloading device is applied in the implementation of the Minjiagou super-large bridge project of Naihe Expressway, and good effect is obtained. The problems of preventing 0# segment cracking and hanging basket and preloading block falling are solved, the cost of preloading material transportation and tower crane use is saved, construction is convenient and safe, and certain economic benefits are obtained. DRAWINGS

[0012] Figure 1 It is the front view of preloading steel structure support device.

[0013] Figure 2 It is the left view of Figure 1 .

[0014] Figure 3 It is the plan view of Figure 1 .

[0015] Figure 4 It is the front view of arch bridge hanging basket 6.

[0016] Figure 5 is a plan view. Figure 4

[0017] Figure 6 is a front view of the arch bridge hanging basket pre-pressing device installation.

[0018] Figure 7 is a left view. Figure 6

[0019] Figure 8 is a partial view. Figure 7 DETAILED DESCRIPTION

[0020] The arch bridge hanging basket pre-pressing device is characterized in that the lower surface of the I-beam 5 is connected with the upper end of the four first channel steels 1 to form a tower-shaped support, the I-beam 5 of the two tower-shaped supports is connected with the two ends of the second channel steel 4 respectively, the upper end of the four third channel steels 3 is connected with the middle part of the second channel steel 4, and the lower end is connected with the lower end of the four first channel steels 1 inside the two tower-shaped supports respectively, the two opposite sides of the arch bridge hanging basket 6 are vertically symmetrical isosceles triangles, and the other two opposite sides are obliquely symmetrical rectangles, the upper edge of the symmetrical rectangle is connected with the main beam, the top angle of the isosceles triangle is connected with the two ends of the main beam, the bottom edge of the isosceles triangle is connected with the tower-shaped support, the upper surface of the I-beam 5 is connected with the lower surface of the main beam through the jack 7, the lower edge of one symmetrical rectangle extends above the abutment and is connected with the upper end of the threaded steel 8 through a nut, the lower end of the threaded steel 8 is connected with the nut 11 through the fourth channel steel 10, the fourth channel steel 10 is connected with the pre-buried steel bar 9 on the outer surface of the abutment. The lower edges of the two symmetrical rectangles are connected to form a load-bearing frame through a plurality of steel strips. The lower end of the channel steel 1 is connected with the steel plate 12.

[0021] The operation procedure of the arch bridge hanging basket pre-pressing device is as follows:

[0022] First stage (preparation work):

[0023] In order to ensure the cleanliness of the pre-pressing site and reduce other foundation concrete construction, the pre-pressing is selected to be carried out on the abutment.

[0024] Firstly, the pre-pressing steel structure support device is processed and manufactured on site on the abutment, and after the processing is completed, a 25t truck crane is used for installation. The installation position is determined according to the size of the arch bridge hanging basket. During installation, the wedge-shaped steel plate 12 is used to ensure that the steel structure support 4 is in close contact with the concrete surface of the abutment.

[0025] Secondly, a core drilling machine is used to drill holes horizontally on the abutment, the hole depth is 100cm, and the φ90 steel bar 9 is pre-buried with 50cm exposed.

[0026] Second stage (hanging basket installation):

[0027] ​​​First, install two jacks of steel structure support device structure, and in the jacks according to the arch bridge hanging basket installation scheme, install the arch bridge hanging basket, the arch bridge hanging basket is 50 cm from the ground. The two symmetrical rectangular lower symmetrical groove of the arch bridge hanging basket is installed with several steel bars to form a bearing frame. The lower end of the channel steel 1 is connected with the steel plate 12.

[0028] After the arch bridge hanging basket is installed, adjust the two jacks to keep the arch bridge hanging basket horizontal.

[0029] Secondly, install two φ32 precision threaded steel 8 at the tail of the arch bridge hanging basket, connect the hanging basket with φ90 steel bar 8 with channel steel 10 and nut 11 to form a rear anchor system;

[0030] Third stage (hanging basket preloading):

[0031] According to the 10%, 50%, 100%, 120% four levels of self weight, preloading, the concrete precast block is directly stacked on the hanging basket bearing frame.

[0032] Fourth stage (hanging basket disassembly):

[0033] After the arch bridge hanging basket preloading material is unloaded, the hanging basket and the preloading support and the rear anchor are removed.

Claims

1. A device for preloading a hanging basket of an arch bridge, characterized in that, The lower surface of the I-shaped steel (5) is connected with the upper end of the four first channel steels (1) to form a tower-shaped support, the I-shaped steels (5) of the two tower-shaped supports are connected with the two ends of the second channel steel (4) respectively, the upper end of the four third channel steels (3) is connected with the middle part of the second channel steel (4), the lower end is connected with the lower end of the four first channel steels (1) inside the two tower-shaped supports respectively, the two opposite side surfaces of the arch bridge hanging basket (6) are vertical symmetrical isosceles triangles, the other two opposite side surfaces are oblique symmetrical rectangles, the upper edge of the symmetrical rectangle is connected with the main beam, the top angle of the isosceles triangle is connected with the two ends of the main beam, the bottom edge of the isosceles triangle is connected with the tower-shaped support, the upper surface of the I-shaped steel (5) is connected with the lower surface of the main beam through the jack (7), the lower edge of one symmetrical rectangle extends above the abutment and is connected with the upper end of the threaded steel (8) through the nut, the lower end of the threaded steel (8) is connected with the nut (11) through the fourth channel steel (10), the fourth channel steel (10) is connected with the embedded steel bar (9) on the outer surface of the abutment, the lower edges of the two symmetrical rectangles are connected to form a bearing frame through a plurality of steel strips.

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