CN115387233A - Construction method for large-span and large-volume bent cap of transition pier of composite beam cable-stayed bridge - Google Patents

Abstract

The present application relates to a construction method of a large-span and large-volume cover beam for a transitional pier of a composite girder cable-stayed bridge. 1. Install the first embedded part, the second bracket and the second embedded part; Step 4, install the first distribution beam; Step 5, install the Bailey beam; Step 6, install the second distribution beam, the third distribution beam and the bottom Formwork installation; step 7, installation of cover beam reinforcement skeleton and side formwork; step 8, concrete pouring in layers; step 9, removal of brackets. In this application, by setting the first bracket and the second bracket as the support of the whole bracket, the construction of the Bailey beam is located on the first bracket and the second bracket, so that the stability of the Bailey beam is guaranteed, and the construction of the whole bracket Not affected by the terrain, it can provide good support for the construction of major cover beams.

Description

A construction method of large-span and large-volume cover beams for transition piers of composite girder cable-stayed bridges

technical field

The invention relates to the technical field of bridge construction, in particular to a large-span and large-volume cover beam construction method for a transition pier of a composite girder cable-stayed bridge.

Background technique

A cable-stayed bridge is a bridge in which the main girder is directly pulled on the bridge tower by many cables. It is very suitable for long-span bridges. In bridge construction, the bridge bracket is the main supporting structure of the integral cast-in-place cap beam construction, which has the advantages of convenient transportation, simple installation and disassembly, and good integrity, and is widely used in the construction of long-span bridges. During the construction of large-span transition piers of cable-stayed bridges, it is necessary to set up cover beams between transition piers. The cover beams support, distribute and transmit the load of the superstructure. big effect. The cover beam of the transition pier is heavy, and there is danger in the construction of the cover beam of the transition pier in a steep place, so the construction of the bridge support is particularly important.

The bridge support in the related art usually adopts a steel pipe column Bailey beam structure, which includes a steel pipe column supported on the ground and a Bailey beam located on the steel pipe column for carrying the cover beam. The steel pipe column is fixed and set Between the two transition piers, the Bailey beam is erected on the transition piers and steel pipe columns. After the bridge bracket is built, the steel formwork and the steel frame of the cover beam are placed, and the side formwork and the bottom form are arranged around the steel frame of the cover beam to connect with the bottom form, so as to form the cover beam by on-site pouring. This kind of bridge construction mainly uses steel pipe columns and Bailey beams as bridge supports to carry out on-site pouring of cap beams, which is more suitable for general bridge construction.

However, in the construction of long-span cap beams, due to the steep terrain, when steel pipe columns are used to support Bailey beams, the installation position of steel pipe columns is affected by the terrain, and sometimes it may need to be supported underwater, which is greatly affected by water flow. Moreover, the load of the cast-in-place cap beam is large, which makes the support of the Bailey beam on the steel pipe column unstable, thereby affecting the stability of the entire bridge support.

Contents of the invention

In order to improve the lack of stability of the bridge support in the related art for the major support of the cover beam, the present application provides a construction method for the large-span and large-volume cover beam of the transition pier of a composite girder cable-stayed bridge.

The construction method of a composite girder cable-stayed bridge transition pier large-span and large-volume cap beam construction method provided by the application adopts the following technical scheme:

A method for constructing a large-span and large-volume cover beam for a transition pier of a composite girder cable-stayed bridge, comprising:

Step 1, chiseling the tops of pier columns: chiseling the tops of the two pier columns that need to be constructed, and removing the cement mortar on the tops of the two pier columns;

Step 2, bracket installation: the bracket includes a first bracket, a second bracket, a first distribution beam, a Bailey beam, a second distribution beam and a third distribution beam, and the first bracket, the second distribution beam The second bracket, the first distribution beam, the Bailey beam, the second distribution beam and the third distribution beam are sequentially installed between the two piers;

Step 3, installation of the first bracket, the first embedded part, the second bracket, and the second embedded part: welding the first embedded part on the two piers, and the first embedded part After the parts are pre-embedded, the first bracket is welded between the first embedded parts, and the horizontal limiting plate is fixed by bilateral right-angle welding between the first bracket and the first embedded parts; Both sides of the pier column are welded to the second embedded part, and the second bracket is welded to the second embedded part;

Step 4, installation of the first distribution beam: install the sand box on the first bracket, and set up the first distribution beam on the sand box, the intersection of the first bracket and the first distribution beam Sand boxes are placed;

Step 5, Bailey beam installation: hoisting the Bailey beam to the first distribution beam with a tower crane;

Step 6, installation of the second distribution beam, the third distribution beam and the bottom form: laying the second distribution beam longitudinally on the Bailey beam, laying the third distribution beam transversely on the Bailey beam, and placing the The bottom mold is installed on the third distribution beam;

Step 7, installation of the steel bar frame of the cover beam and the side form: after the preloading of the bracket, the steel bar frame of the cover beam is installed on the bottom form, and the side forms are installed on the four side edges of the steel bar frame of the cover beam , the side form is installed in close contact with the bottom form;

Step 8, Concrete layered pouring: Concrete is layered to pour the support, and after the concrete pouring is completed and the initial setting is completed, the concrete is maintained by drip irrigation;

Step 9, remove the support: after the construction is completed, the support can be removed, and the support can be removed after the sand box is lowered to a certain height.

By adopting the above-mentioned technical scheme, before the on-site pouring of the cover beam, it is necessary to build a support between the two pier columns to be constructed. First, the first embedded parts are pre-embedded on the two pier columns. After the first embedded parts are pre-embedded, the first bracket is transported between the first embedded parts by tower crane, and the second bracket is placed between the first embedded parts through the horizontal limit plate. One embedded part and the first bracket are welded and fixed; the second embedded part is installed on both sides of the pier column, and after the second embedded part is installed, the second bracket is installed on the second embedded part and welded Fixed; after the installation of the first bracket and the second bracket is completed, place the sand box on the first bracket, and erect the first distribution beam on the sand box; place the Bailey beam on the first distribution beam, and the Bailey beam passes through the tower crane Lifted to the first distribution beam to support the on-site pouring of the cover beam; after the Bailey beam is installed, the second distribution beam and the third distribution beam are respectively laid on the Bailey beam, and the entire bracket is installed; the bracket is completed Finally, set up the base form on the support, and place the steel frame of the cover beam on the base form, and set side forms around the steel frame of the cover beam to limit the shape of the cover beam, and then pour the steel frame of the cover beam on site. The cover beam is formed, and the support can be removed after the cover beam is formed and reaches the standard structural strength. The removal of the support is through the sand box of a certain height to make the support move down, so as to dismantle the entire support. So far the cover beam Construction completed. By setting the first bracket and the second bracket to support the Bailey beam, the support of the Bailey beam is strengthened, and the load-bearing capacity of the on-site pouring of the cover beam is further provided to ensure the safety of the large cover beam during construction. Stable and good construction effect.

Preferably, the Bailey beam is arranged along the length direction of the first bracket, and the two ends of the Bailey beam are respectively erected on the second brackets of the two piers.

By adopting the above technical scheme, the two ends of the Bailey beam are erected on the second brackets of the two pier columns respectively, and the Bailey beam is placed on the first bracket along the length direction of the first bracket, and the first bracket The frame and the second bracket provide good support for the Bailey beam, so that the support of the Bailey beam is not affected by the terrain, and can better provide stable support for the on-site pouring of the cover beam.

Preferably, there are multiple groups of the first embedded parts on the pier column, and multiple groups of the first embedded parts are arranged along the width direction of the pier column, and the first embedded parts face toward the pier One side of the column is provided with a pre-embedded steel plate, and the side of the pre-embedded steel plate facing away from the first embedded part is provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are all pierced in the pier column.

By adopting the above-mentioned technical solution, the pre-embedded steel plate and the reinforcing rib enable the first embedded part to be more firmly embedded in the pier column, so that the first embedded part has a better load-bearing capacity for the first bracket, making the first embedded part more stable. The bracket can be firmly erected between two piers as the most basic support in the bracket.

Preferably, a first steel bracket is provided under the first embedded part, the top of the first steel bracket is welded to the bottom of the first embedded part, and the first steel bracket faces One side of the pier is welded and fixed to the pier.

By adopting the above technical solution, the first steel bracket provided at the bottom of the first embedded part can support the first embedded part, thereby strengthening the support for the first bracket.

Preferably, there are multiple horizontal limiting plates, the multiple horizontal limiting plates are vertically welded on the first embedded part, and the side of the horizontal limiting plate is away from the first embedded part Weld with the first bracket.

By adopting the above technical solution, the connection between the first embedded part and the first bracket is welded and fixed by a plurality of horizontal limiting plates, and the horizontal limiting plates can limit the first bracket, thereby preventing The phenomenon that the first bracket slides off the first embedded part occurs.

Preferably, the second embedded part includes a second steel corbel welded to the side wall of the pier column and a supporting steel plate arranged on the second steel corbel, and the side wall of the pier column is penetrated by the first steel corbel. A threaded steel, the two ends of the first threaded steel pass through the supporting steel plates on both sides of the pier respectively.

By adopting the above technical solution, the second steel corbel provides stable support for the second embedded part, and the supporting steel plate and the first threaded steel make the second embedded part fixed on the pier column, so that the second embedded part Connectivity to piers is guaranteed.

Preferably, one side of the second bracket is welded and fixed to the pier, the bottom of the second bracket is welded and fixed to the top of the supporting steel plate, and the second bracket is provided with a Fixed components of the Bailey beam.

By adopting the above technical solution, the second bracket is connected with the second embedded part so that the support structure for the bracket is increased on both sides of the pier column, so that the second bracket supports the bracket, and the fixing component on the second bracket makes When the Bailey beam is erected on the second bracket, it can fix the Bailey beam.

Preferably, the fixing assembly includes an installation limiting plate arranged on the side of the second bracket away from the pier column and a limiting block passing through the installation limiting plate, and the installation limiting plate The side part of the opening is provided with accommodating groove, and the said limiting block is slidably arranged in said accommodating groove, and one side of said limiting block abuts against the side part of said Bailey beam, said limiting block and The installation limiting plates are fixed by bolts.

By adopting the above technical scheme, the installation of the limit plate can limit the Bailey beam to prevent the Bailey beam from slipping from the second bracket, and the limit block inserted in the installation limit plate can be hoisted on the Bailey beam to For the second bracket, fine-tune the installation position of the Bailey beam, and knock the limit block with a tool by hand, so that the limit block abuts against the side of the Bailey beam, so that the Bailey beam is close to the pier column direction to move.

Preferably, the top of the installation limiting plate is provided with a guide surface, the guide surface faces the side of the pier, the guide surface is perforated, and the pier faces one side of the guide surface. The side is pierced with an opening for aligning with the perforation, the opening runs through the side of the pier, the through hole and the opening pass through a second threaded steel, and the second threaded steel A nut is sheathed on the end of the guide surface through the guide surface, and a hooking assembly for hooking the Bailey beam is also provided on the second bracket.

By adopting the above technical solution, the guide surface can guide the falling of the Bailey beam, so that the Bailey beam can be installed on the second bracket along the direction of the guide surface, and the second threaded steel pierced on the side of the pier column passes through the guide After the perforation of the surface, the nuts are tightened, so that the Bailey beams on both sides of the pier column are fixed by the second threaded steel.

Preferably, the hooking assembly includes a third threaded steel threaded on the side of the pier column and right-angle hooks respectively hinged to both ends of the third threaded steel, and a rotating shaft is provided at the end of the third threaded steel , the right-angle hook is hinged on the rotating shaft, and the right-angle hook can rotate horizontally around the rotating shaft.

By adopting the above technical scheme, the third threaded steel pierced on the side of the pier column plays a role of fixing the rotating shaft and the right-angle hook. The right-angle hook can rotate horizontally around the rotating shaft. When the Bailey beam is suspended, the right-angle hook rotates around the rotating shaft to the top surface far away from the second bracket, so that the Bailey beam is lowered to the second bracket, and after abutting against the side of the Bailey beam through the limit block, the right-angle hook is rotated around the rotating shaft until it is hooked One side of the Bailey beam, so that the position of the Bailey beam is initially fixed, so that the Bailey beam is fixed on the second bracket, and it is convenient to fix the position of the Bailey beam through the second threaded steel later.

In summary, the present application includes at least one of the following beneficial technical effects:

1. Before the on-site pouring of the cover beam, set up a bracket between the two pier columns that need to be constructed. The first bracket and the second bracket used in the bracket are used as the most basic support structure of the bracket, and the Bailey beam is erected on the second On the first bracket and the second bracket, the support of the Bailey beam is not affected by the terrain, so that the construction of the entire bracket is not greatly affected by the terrain, and it can provide good support for the poured cover beam. Able to support the construction work of major cap beams;

2. The installation limit plate and the limit block on the second bracket limit the position of the Bailey beam and can fine-tune the position of the Bailey beam, so that the installation position of the Bailey beam is accurate; the right angle on the second bracket The hook hooks the Bailey beam to initially position the Bailey beam, so that the second threaded steel can fix the Bailey beam after the location of the Bailey beam is determined.

Description of drawings

Fig. 1 is a kind of flow chart of superimposed girder cable-stayed bridge transition pier large-span, large-volume cap beam construction method;

Fig. 2 is the overall structure schematic diagram of the embodiment of the present application;

Fig. 3 is an enlarged schematic diagram of part A in Fig. 2;

Fig. 4 is a structural schematic diagram of another perspective of the embodiment of the present application;

Fig. 5 is a schematic diagram of the assembly of the Bailey beam and the installation limit plate and the limit block in the embodiment of the present application;

Figure 6 is an enlarged schematic view of part B in Figure 5;

Fig. 7 is a schematic cross-sectional structure diagram of an embodiment of the present application.

Explanation of reference signs: 1. Pier column; 2. First bracket; 3. First embedded part; 31. Embedded steel plate; 32. Reinforcing rib; 33. First steel corbel; 34. Connecting plate; 4 , horizontal limiting plate; 5, the second embedded part; 51, the second steel corbel; 52, supporting steel plate; 53, the first threaded steel; 6, the second bracket; 61, installing the limiting plate; 611, 612, guide surface; 6121, perforation; 62, limit block; 621, contact part; 622, guide part; 7, sand box; 8, first distribution beam; 9, Bailey beam; 10, 11, the second threaded steel; 111, the nut; 12, the third threaded steel; 121, the rotating shaft; 13, the right angle hook; 14, the second distribution beam; 15, the third distribution beam.

Detailed ways

The present application will be described in further detail below in conjunction with accompanying drawings 1-6.

A method for constructing a transition pier of a composite girder cable-stayed bridge with a large-span and large-volume cover beam, comprising the following steps:

Step 1, chiseling the top of the pier 1: chiseling the tops of the two pier 1 to be constructed, and removing the cement mortar on the top of the two pier 1;

Step 2, bracket installation: the bracket includes the first bracket 2, the second bracket 6, the first distribution beam 8, the Bailey beam 9, the second distribution beam 14 and the third distribution beam 15, and the first bracket 2, The second bracket 6, the first distribution beam 8, the Bailey beam 9, the second distribution beam 14 and the third distribution beam 15 are sequentially installed between the two piers 1;

Step 3, install the first bracket 2, the first embedded part 3, the second bracket 6, and the second embedded part 5: weld the first embedded part 3 on the two piers 1, and the first embedded part After the part 3 is pre-embedded, the first bracket 2 is welded between the first pre-embedded parts 3, and a horizontal limit plate 4 is fixed between the first bracket 2 and the first pre-embedded part 3 by bilateral right-angle welding; Weld the second embedded part 5 on both sides, and weld and fix the second bracket 6 and the second embedded part 5;

Step 4, installation of the first distribution beam 8: install the sand box 7 on the first bracket 2, and set up the first distribution beam 8 on the sand box 7, the intersection of the first bracket 2 and the first distribution beam 8 Place the sand box 7;

Step 5, installation of Bailey beam 9: hoisting Bailey beam 9 onto the first distribution beam 8 by tower crane;

Step 6, installation of the second distribution beam 14, the third distribution beam 15 and the bottom mold: laying the second distribution beam 14 longitudinally on the Bailey beam 9, laying the third distribution beam 15 horizontally on the Bailey beam 9, and Bottom form is installed on the 3rd distribution beam 15;

Step 7, installation of cover beam reinforcement frame and side form: install the cover beam reinforcement frame on the bottom form after the bracket is preloaded, and install side forms on the four sides of the cover beam reinforcement frame, and the side forms are attached to the bottom form for installation ;

Step 8, Concrete is poured in layers: Concrete is poured in layers to support the bracket. After the concrete is poured and initially set, the concrete is maintained by drip irrigation;

Step 9, remove the support: after the construction is completed, the support can be removed, and the support can be removed after lowering the sand box 7 to a certain height.

Wherein, in the above-mentioned step 2, the first embedded part 3 is welded by three short H350 type steels side by side, and the first bracket 2 is welded by I45b I-beam and steel plate. The second embedded part 5 is welded by section steel and I-beam, and the second bracket 6 is welded by I45b I-beam. The first distribution beam 8 is welded by two H594-shaped steel grooves. The Bailey beam 9 is formed by assembling a single layer of 23 rows of Bailey sheets, and the Bailey sheets are connected by standard flower windows. The second distribution beam 14 is made of I20b steel, and the third distribution beam 15 is made of I14b steel.

Among them, the first embedded parts 3 on each pier column 1 are three groups. Evenly distributed, the side of the first embedded part 3 close to the pier column 1 is welded and fixed to the pier column 1 . The side of the first embedded part 3 facing the pier 1 is provided with an embedded steel plate 31 , and the first embedded part 3 and the embedded steel plate 31 are vertically arranged. The side of the embedded steel plate 31 facing away from the first embedded part 3 is provided with a plurality of reinforcing ribs 32. When installing between the first embedded part 3 and the pier column 1, the reinforcing ribs 32 on the embedded steel plate 31 will into the pier column 1, and the first embedded part 3 and the pier column 1 are welded and fixed, thereby ensuring the connection strength between the first embedded part 3 and the pier column 1. In this embodiment, three sets of first embedded parts 3 are arranged on the two pier columns 1, and the three sets of first embedded parts 3 on the two pier columns 1 are arranged oppositely, and the two ends of the first bracket 2 Correspondingly arranged between a group of first embedded parts 3 .

A set of first brackets 2 is installed between each set of first embedded parts 3 of the two pier columns 1. There are three sets of first brackets 2, and angle steel and section steel are fixed between the three sets of first brackets 2 by welding. Therefore, the three sets of first brackets 2 are connected as a whole, and the first brackets 2 are hoisted and transported as a whole by a tower crane to be installed and fixed between two piers 1 .

Both ends of the first bracket 2 are respectively arranged on the first embedded parts 3 of the two piers 1, and the first bracket 2 and the first embedded parts 3 are fixed by welding. The horizontal limiting plate 4 is vertically arranged on the first embedded part 3, and the side of the horizontal limiting plate 4 away from the first embedded part 3 is welded and fixed to the first bracket 2. The two outer parts of the first bracket 2 Both are provided with a horizontal limiting plate 4, which plays a role of limiting and fixing the first bracket 2.

A first steel corbel 33 for strengthening the support of the first bracket 2 is also arranged below the first embedded part 3, one side of the first steel corbel 33 is welded and fixed to the pier 1, and the first steel corbel The side of the leg 33 facing the first embedded part 3 is welded and fixed to the bottom of the first embedded part 3 .

The first steel brackets 33 under the three first embedded parts 3 on the pier column 1 are also provided with a connecting plate 34 for connection and fixing. The connecting plate 34 is I-shaped steel, and the two ends of the connecting plate 34 are respectively welded On the sides of the first steel brackets 33 facing each other, the connecting plate 34 is used to strengthen the connection strength between the first steel brackets 33 so as to better support the first bracket 2 .

The second embedded part 5 is pre-welded on the two outer walls of the pier column 1, and the second embedded part 5 includes a second steel corbel 51 welded on the pier column 1 and a steel corbel 51 arranged on the second steel corbel 51. The supporting steel plate 52 is welded by H350 steel, and the supporting steel plate 52 and the second steel corbel 51 are integrally formed. The two side walls of the pier column 1 are reserved with reserved square holes, and the first threaded steel 53 is pierced between the supporting steel plates 52 of the two side walls of the pier column 1, and the first threaded steel 53 runs through the reserved square hole. In the hole, and the two ends of the first threaded steel 53 pass through the two supporting steel plates 52 respectively, which strengthens the connection and fixation between the second embedded part 5 and the pier column 1 .

The second bracket 6 is installed on the second embedded part 5, the height of the second bracket 6 is equal to the height of the first bracket 2 on the horizontal plane, and the cross section of the second bracket 6 is arranged in a right triangle. One side of the frame 6 is welded and fixed to the pier 1 , and the bottom side of the second bracket 6 is welded and fixed to the top of the supporting steel plate 52 . The middle positions of the second brackets 6 on the two outer sides of the pier 1 are also fixed with a first threaded steel 53 , so that the second bracket 6 is fixedly connected to the pier 1 .

There are multiple sand boxes 7 on the top of the first bracket 2, and a plurality of sand boxes 7 are evenly distributed on the first bracket 2 at the main support point between the first distribution beam 8, and each first bracket 2 There are sand boxes 7 at both ends and in the middle of the top, and the sand boxes 7 play the role of supporting the distribution beam and the Bailey beam 9, and it is convenient to remove the support later.

After the multiple sand boxes 7 are placed on the first bracket 2, the first distribution beam 8 and the sand boxes 7 are fixed. There are multiple groups of first distribution beams 8, and multiple groups of first distribution beams 8 are evenly distributed along the length direction of the first bracket 2, and the first distribution beams 8 play a role in transferring the weight of the Bailey beam 9 to the first bracket 2 role.

Bailey beams 9 are placed above the first distribution beam 8, wherein there are three groups of Bailey beams 9, and the three groups of Bailey beams 9 are all arranged along the length direction of the first bracket 2, and the three groups of Bailey beams 9 are arranged along the transverse direction. Evenly distributed across the direction of the three sets of first brackets 2 . The Bailey beams 9 on both sides are respectively located on two opposite sides of the pier 1 . Two ends of the two sets of Bailey beams 9 located on both sides of the pier 1 are respectively located on the second bracket 6 on the same side of the two pier 1 . Each group of Bailey beams 9 is hoisted to the first bracket 2 and the second bracket 6 in turn by a tower crane, thereby realizing the installation of Bailey beams 9, and the two ends of Bailey beams 9 are erected on the second bracket 6 , so that the Bailey beam 9 is firmly supported, and the phenomenon of shaking is not easy to occur.

The second bracket 6 is provided with a fixing assembly for auxiliary fixing when the Bailey beam 9 is lifted. The limit block 62 in the position plate 61 is installed and connected to the side wall of the second bracket 6 near the upper end surface, and the limit plate 61 is installed vertically to the top of the second bracket 6 .

A receiving groove 611 is provided on the side of the installation limiting plate 61 , the receiving groove 611 is arranged in a rectangular shape, and the accommodating groove 611 runs through the side of the installation limiting plate 61 . The limiting block 62 is slidably disposed in the accommodating groove 611 . The limiting block 62 includes an abutting portion 621 and a guiding portion 622 , the abutting portion 621 is arranged in a rectangular shape, and the abutting portion 621 is located on a side where the limiting plate 61 is installed close to the pier 1 . The guide part 622 is connected to the side of the abutment part 621 away from the pier column 1. The guide part 622 is arranged in a trapezoidal shape. Tap to push the stopper 62. After the Bailey beam 9 is transported to the second bracket 6 by the tower crane, because there is a certain deviation between the hanging position of the tower crane and the installation position of the Bailey beam 9, the Bailey beam 9 is hoisted to the second bracket 6 Finally, the guide part 622 is knocked by hand with a tool to make the abutment part 621 move toward the side close to the pier column 1, thereby pushing the Bailey beam 9 to approach the pier column 1, so as to fine-tune the position of the Bailey beam 9 After fine-tuning the position of the Bailey beam 9, the limiting block 62 and the installation limiting plate 61 are fixed by bolts.

The top of the installation limiting plate 61 is provided with an inclined downward guide surface 612 , and the guiding surface 612 is located on the side of the installation limiting plate 61 facing the pier 1 . The guide surface 612 is used to guide the Bailey beam 9 to fall so as to be installed on the second bracket 6. The guide surface 612 is perforated with a perforation 6121, and the side of the pier 1 facing the guide surface 612 is perforated with a hole corresponding to the perforation 6121. The opening 10 runs through the side of the pier 1 . Between the opening 10 and the perforation 6121, there is a second threaded steel 11, and the two ends of the second threaded steel 11 pass through the opening 10 respectively and pass through the perforation 6121 of the guide surface 612 on both sides of the pier column 1. Two threaded steel bars 11 pass through the guide surface 612 and cover with nuts 111 , and the Bailey beams 9 on both sides of the pier column 1 are fixed by tightening the nuts 111 .

The side of the pier column 1 facing the Bailey beam 9 is also provided with a hooking assembly for hooking and fixing the Bailey beam 9. The hooking assembly includes a third threaded steel 12 pierced on the side of the pier column 1 and respectively hinged on the first Right angle hook 13 at three rebar 12 two ends. The third threaded steel 12 is located on the side of the pier 1 away from the first bracket 2 . The two ends of the third threaded steel 12 pass through both sides of the pier column 1 respectively, and one end of the third threaded steel 12 passing through the side of the pier column 1 is connected with a rotating shaft 121, the rotating shaft 121 is vertically arranged, and the right-angle hook 13 is hinged on the rotating shaft 121, the right-angle hook 13 can rotate horizontally relative to the rotating shaft 121, and the right-angle hook 13 is arranged at a right angle. When the Bailey beam 9 is suspended, the right-angle hook 13 rotates around the rotating shaft 121 away from the top surface of the second bracket 6, so that the Bailey beam 9 is suspended on the second bracket 6, and is abutted by the limit block 62 Behind the side of the Bailey beam 9, the position of the Bailey beam 9 is initially fixed by rotating the right-angle hook 13 around the rotating shaft 121 to the side holding the Bailey beam 9, so that the Bailey beam 9 is fixed on the On the second bracket 6, it is convenient to fix the position of the Bailey beam 9 through the second threaded steel 11 later.

After the Bailey beam 9 is fixedly connected, the second distribution beam 14 is installed on the Bailey beam 9 along the longitudinal direction of the Bailey beam 9 . There are multiple second distribution beams 14, and the plurality of second distribution beams 14 are uniformly distributed along the length direction of the Bailey beam 9, and the second distribution beams 14 and the Bailey beam 9 are welded and fixed.

The 3rd distribution beam 15 is positioned on the 2nd distribution beam 14, and the 3rd distribution beam 15 has many roots, and a plurality of 3rd distribution beams 15 are arranged along the length direction of Bailey beam 9, and the 3rd distribution beam 15 and the 2nd distribution beam 14 The joints are fixed by welding.

After the brackets are fixed and installed, the bottom form is installed on the third distribution beam 15. The cross section of the bottom form is set in a similar shape. The bottom form is located on the top of the two piers 1, and the bottom form is fixedly placed on the third distribution beam 15. After being installed, the whole bracket is preloaded, and the bracket preloading can eliminate the inelastic deformation of the bracket.

The steel frame of the cover beam is placed on the bottom form. The cross section of the steel frame of the cover beam is L-shaped.

Side forms are installed on the four outer edges of the steel frame of the cover beam. The side forms are made of wood formwork. One side of the side form is closely fixed to the bottom form, and the side forms are connected and fixed.

After the bottom form, the steel frame of the cover beam and the side form are installed and fixed, the steel frame of the cover beam is poured on site to form the cover beam.

After the structural strength of the cover beam reaches 100% of the design, the support can be removed. After the sand box 7 is lowered to a certain height, the second distribution beam 14, the third distribution beam 15 and the Bailey beam 9 are removed, and then the first bracket 2 is removed. , the second bracket 6, the first embedded part 3 and the second embedded part 5, so as to complete the construction work of pouring on-site cap beam.

The implementation principle of the present application is: before the on-site pouring of the cover beam, a support needs to be erected between the two pier columns 1 to be constructed. First, the first embedded parts 3 are pre-embedded on the two pier columns 1, so that the first bracket 2 is installed between the first embedded parts 3 and connected with the pier column 1; Two embedded parts 5, the second bracket 6 is installed on the second embedded part 5, and fixed by welding; the first bracket 2 and the second bracket 6 are used as the most basic support of the bracket, and the first bracket 2 By placing the sand box 7 and the first distribution beam 8 to support the Bailey beam 9; laying the second distribution beam 14 and the third distribution beam 15 respectively on the Bailey beam 9, so that the installation of the bottom form; Set up the bottom formwork on top, and place the cover beam steel skeleton on the bottom mold, and set side forms around the cover beam steel skeleton to limit the shape of the cover beam, and then pour the cover beam steel skeleton on site to make the cover beam take shape After the cover beam is formed and reaches the standard structural strength, the support can be removed, and the support is removed by lowering the sand box 7 to remove the entire support, so far the construction of the cover beam is completed. By arranging the first bracket 2 and the second bracket 6 to support the Bailey beam 9, the support to the Bailey beam 9 is strengthened, and the load-bearing capacity is further provided for the on-site pouring of the cover beam, so as to ensure the support of the large cover beam. The beam is stable during construction and the construction effect is good.

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

Claims (10)

1. The utility model provides a coincide roof beam cable-stay bridge transition mound long span, bulky bent cap construction method which characterized in that includes:

step one, roughening the top of the pier stud (1): performing chiseling treatment on the tops of the two pier columns (1) to be constructed, and chiseling cement mortar on the tops of the two pier columns (1);

step two, mounting a bracket: the support comprises a first bracket (2), a second bracket (6), a first distribution beam (8), a Bailey beam (9), a second distribution beam (14) and a third distribution beam (15), the first bracket (2), the second bracket (6), the first distribution beam (8), the Bailey beam (9), the second distribution beam (14) and the third distribution beam (15) are sequentially mounted between two pier studs (1);

step three, installing the first bracket (2), the first embedded part (3), the second bracket (6) and the second embedded part (5): the first embedded parts (3) are welded on the two pier studs (1), the first bracket (2) is welded between the first embedded parts (3) after the first embedded parts (3) are embedded, and a horizontal limiting plate (4) is arranged between the first bracket (2) and the first embedded parts (3) for double-side right-angle welding and fixing; welding the second embedded parts (5) on two sides of the pier stud (1), and welding and fixing the second bracket (6) and the second embedded parts (5);

step four, installing a first distribution beam (8): installing a sand box (7) on the first bracket (2), erecting a first distribution beam (8) on the sand box (7), and placing the sand box (7) at the intersection of the first bracket (2) and the first distribution beam (8);

step five, installing the Bailey beam (9): hoisting the Bailey beam (9) to the first distribution beam (8) by adopting a tower crane;

step six, installing a second distribution beam (14), a third distribution beam (15) and a bottom die: -laying said second distribution beams (14) on said bery beams (9) in longitudinal direction, -laying said third distribution beams (15) on said bery beams (9) in transverse direction, and-mounting said counter-forms to said third distribution beams (15);

seventhly, installing a cover beam steel reinforcement framework and a side mold: after the support is pre-pressed, the bent cap steel reinforcement framework is installed on the bottom die, the side dies are installed on the four side edges of the bent cap steel reinforcement framework, and the side dies are tightly attached to the bottom die for installation;

step eight, concrete layered pouring: pouring the support by concrete layers, and curing the concrete by adopting a drip irrigation curing mode after the concrete is poured and initially set;

step nine, dismantling the support: after construction is completed, the support can be detached, and the support is detached after the sand box (7) is lowered to a certain height.

2. The construction method of the large-span and large-volume capping beam of the transition pier of the composite beam cable-stayed bridge according to claim 1, characterized in that: the Bailey beam (9) is arranged along the length direction of the first bracket (2), and two ends of the Bailey beam (9) are erected on the second brackets (6) of the two pier studs (1) respectively.

3. The construction method of the large-span and large-volume capping beam of the transition pier of the composite beam cable-stayed bridge according to claim 1, characterized in that: on pier stud (1) first built-in fitting (3) have the multiunit, the multiunit first built-in fitting (3) are followed the width direction setting of pier stud (1), first built-in fitting (3) orientation one side of pier stud (1) is provided with pre-buried steel sheet (31), pre-buried steel sheet (31) deviate from one side of first built-in fitting (3) is provided with many strengthening ribs (32), many strengthening rib (32) all wear to locate in pier stud (1).

4. The construction method of the large-span and large-volume capping beam of the transition pier of the composite beam cable-stayed bridge according to claim 3, characterized in that: the lower part of first built-in fitting (3) is provided with first steel bracket (33), the top of first steel bracket (33) with the bottom welded fastening of first built-in fitting (3), first steel bracket (33) orientation one side of pier stud (1) with pier stud (1) welded fastening.

5. The construction method of the large-span and large-volume capping beam of the transition pier of the composite beam cable-stayed bridge according to claim 1, characterized in that: the horizontal limiting plates (4) are multiple, the horizontal limiting plates (4) are perpendicularly welded to the first embedded part (3), and one side, far away from the first embedded part (3), of each horizontal limiting plate (4) is welded to the first bracket (2).

6. The construction method of the large-span and large-volume capping beam of the transition pier of the composite beam cable-stayed bridge according to claim 1, characterized in that: second built-in fitting (5) including weld in second steel bracket (51) of pier stud (1) lateral wall and set up in supporting steel sheet (52) on second steel bracket (51), the lateral wall of pier stud (1) runs through there is first screw-thread steel (53), wear out respectively at the both ends of first screw-thread steel (53) pier stud (1) both sides outside supporting steel sheet (52).

7. The construction method of the large-span and large-volume capping beam of the transition pier of the composite beam cable-stayed bridge according to claim 6, characterized in that: one side of second bracket (6) with pier stud (1) welded fastening, the bottom of second bracket (6) with the top welded fastening of supporting steel plate (52), be provided with on second bracket (6) and be used for fixing the fixed subassembly of bailey roof beam (9).

8. The construction method of the large-span and large-volume capping beam of the transition pier of the composite beam cable-stayed bridge according to claim 1, characterized in that: fixed subassembly including set up in second bracket (6) are kept away from installation limiting plate (61) of pier stud (1) one side and are worn to locate stopper (62) in installation limiting plate (61), storage tank (611) have been seted up to the lateral part of installation limiting plate (61), stopper (62) slide set up in storage tank (611), one side butt of stopper (62) in the lateral part of beiLei roof beam (9), stopper (62) with pass through the bolt fastening between installation limiting plate (61).

9. The construction method of the large-span and large-volume capping beam of the transition pier of the composite beam cable-stayed bridge according to claim 8, characterized in that: the top of installation limiting plate (61) is provided with guide face (612), guide face (612) orientation the lateral part of pier stud (1), wear to be equipped with on guide face (612) perforation (6121), pier stud (1) orientation one side of guide face (612) wear to be equipped with be used for with trompil (10) of perforation (6121) counterpoint, trompil (10) run through the lateral part of pier stud (1), perforation (6121) with it has second screw-thread steel (11) to run through in trompil (10), the tip of second screw-thread steel (11) passes guide face (612) back cover is equipped with nut (111), still be provided with on second bracket (6) and be used for colluding holding the subassembly is held to colluding of beiLei liang (9).

10. The construction method of the large-span and large-volume capping beam of the transition pier of the composite beam cable-stayed bridge according to claim 9, characterized in that: collude and hold the subassembly including wearing to locate third screw-thread steel (12) of pier stud (1) lateral part and articulate respectively in right angle hook (13) at third screw-thread steel (12) both ends, the tip of third screw-thread steel (12) is provided with pivot (121), right angle hook (13) articulate in on pivot (121), right angle hook (13) can wind pivot (121) carry out the horizontal rotation.

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