CN211897803U - Continuous new construction of composite beam structure using UHPC beam-with stud steel end plates - Google Patents

Abstract

The utility model relates to a continuous new structure of a composite beam structure adopting UHPC beams-steel end plates with studs, comprising a first steel beam whose first ends are close to each other, a second steel beam, and a temporary steel beam arranged below the first end. Supports, permanent supports and substructures. Vertical studs are arranged on the upper surfaces of the first steel beam and the second steel beam, and steel end plates are respectively fixed on the first ends of the first steel beam and the second steel beam. Horizontal bolts are arranged on the opposite surfaces of the plates, and UHPC beams are poured in the space enclosed by the opposite surfaces of the two steel end plates and the upper end surface of the permanent support. The upper surface of the steel girder is respectively extended to cast a section of the UHPC bridge deck, and the reinforced concrete bridge deck is respectively poured on the side of the UHPC deck deck on the upper surfaces of the first steel girder and the second steel girder; the utility model solves the problem of It solves the problem of easy cracking of the concrete slab in the negative bending moment area of the continuous beam, facilitates construction, and improves the economy.

Description

Continuous new construction of composite beam structure using UHPC beam-with stud steel end plates

Technical field:

The utility model relates to a new continuous structure of a composite beam structure using UHPC beams and steel end plates with bolts.

Background technique:

In recent years, steel-concrete composite beams have been widely used in engineering practice, which has many advantages compared with traditional concrete beams and steel beams. However, the steel-concrete composite continuous girder bridge has a large negative bending moment at the support, the concrete bridge deck is prone to cracking due to the large tensile stress, and the concrete slab in the negative bending moment area quits work due to cracking , the stiffness of the composite beam is weakened. If the cracks are large, harmful substances may penetrate into the concrete through the cracks, which will seriously corrode and corrode the steel bars, reduce the durability of the composite beam, and increase the difficulty of maintenance work; secondly, the steel-concrete composite The construction method of girder bridges is usually to prefabricate the main steel girder in the prefabrication field, then weld and assemble the main girder on site, erect the steel main girder, and finally pour the concrete bridge deck; at the same time, in order to improve the stability and torsional performance of the girder, usually Lateral stiffeners are arranged at the seat to maintain the local stability of the beam and transmit the reaction force of the support. A large number of welding work has caused the uneconomical performance of the composite beam bridge.

Invention content:

The purpose of this utility model is to provide a continuous new structure of the composite beam structure using UHPC beam-steel end plates with studs, which is beneficial to solve the problem of steel - The concrete slab in the negative moment area of the concrete composite continuous beam is easy to crack, and it is convenient for construction and improves the economy.

The utility model adopts a new continuous structure of UHPC beam-combined beam structure with steel end plates with studs, and is characterized in that: the utility model comprises a first steel beam and a second steel beam whose first ends are close to each other, and are arranged below the first ends. The temporary support, the permanent support and the substructure, the upper surfaces of the first steel beam and the second steel beam are arranged with vertical pegs, and the first ends of the first steel beam and the second steel beam are Steel end plates are fixed respectively, horizontal bolts are arranged on the opposite surfaces of the two steel end plates, and UHPC beams are cast in the space enclosed by the opposite surfaces of the two steel end plates and the upper end surface of the permanent support. The upper part of the UHPC beam extends to the upper surfaces of the first steel girder and the second steel girder to respectively cast a section of UHPC bridge deck layer, on the upper surfaces of the first steel girder and the second steel girder are located on the side of the UHPC bridge deck layer respectively A reinforced concrete bridge deck is poured.

Further, the above-mentioned vertical pegs and horizontal pegs are both cylindrical head pegs.

Further, the above-mentioned vertical studs, steel end plates and horizontal studs and the first steel beam or the second steel beam are all prefabricated.

Further, the distance between the two steel end plates on the first steel beam and the second steel beam is smaller than the width of the upper end of the lower structure.

The utility model welds vertical bolts on the upper surface of the steel beam located in the negative bending moment area of the steel-concrete composite continuous beam and pours the UHPC bridge deck; The steel-concrete composite beam solves the problem of easy cracking of the concrete slab in the negative moment area of the steel-concrete composite continuous beam. Under the vertical load, the steel end plate of the steel-concrete composite beam transfers the pressure of the lower steel girder flange to the UHPC beam, and the UHPC beam and the UHPC bridge deck are used to resist the upper surface tension of the negative bending moment area of the steel-concrete composite continuous beam. In addition, the horizontal studs welded to the steel end plates transmit shear loads, which can meet the requirements of mechanical properties. Thus, the occurrence and development of cracks in the negative moment area of the steel-concrete composite continuous beam are avoided. At the same time, the use of steel end plates, horizontal bolts and UHPC beams to connect adjacent steel-concrete composite beams is simple and convenient.

The utility model adopts the construction method of the continuous new structure of the UHPC beam-combined beam structure with stud steel end plates, wherein the continuous new structure of the UHPC beam-combined beam structure with stud steel end plates includes the first ends approaching each other. a first steel beam, a second steel beam, a temporary support, a permanent support and a substructure arranged below the first end, the upper surfaces of the first steel beam and the second steel beam are arranged with vertical studs, Steel end plates are respectively fixed on the first ends of the first steel beam and the second steel beam, and horizontal bolts are respectively arranged on the opposite surfaces of the two steel end plates. A UHPC beam is poured in the space enclosed by the upper end face of the permanent support. The upper part of the UHPC beam extends to the upper surface of the first steel beam and the second steel beam to cast a section of the UHPC bridge deck layer. On the upper surface of the second steel beam, a reinforced concrete bridge deck is respectively poured on the side of the UHPC bridge deck;

The construction steps are as follows:

(1) Construction of the substructure, establishment and installation of temporary supports and permanent supports.

(2) Prefabrication of the first steel beam and the second steel beam, welding steel end plates at the ends of the first steel beam and the second steel beam, welding vertical studs on the upper surfaces of the first steel beam and the second steel beam, Weld horizontal studs on the outer surfaces of the steel end plates of the first steel beam and the second steel beam, and install and debug hoisting equipment;

(3) Hoist the first and second steel beams with steel end plates, vertical studs and horizontal studs; place the first and second steel beams on the temporary supports, and the structure is Simple state.

(4) Weld the transverse connection of the first steel beam and the second steel beam, use the first steel beam and the second steel beam as supports, set up a template, and pour steel bars on the upper surfaces of the first steel beam and the second steel beam respectively. Concrete bridge deck, there is a gap between the reinforced concrete deck decks poured on both sides;

(5) The UHPC bridge deck layer is poured in the interval between the reinforced concrete bridge deck layers poured on both sides, and the UHPC beam is poured in the space enclosed by the opposite surfaces of the two steel end plates and the upper end surface of the permanent support.

(6) Remove temporary supports, complete system transformation, and organize bridge deck construction.

The advantage of the structure of the utility model is that the vertical studs are welded on the upper surface of the steel beam located in the negative bending moment area of the steel-concrete composite continuous beam and the UHPC bridge deck is poured; The stud is connected to the UHPC beam. This connection method has a simple structure and clear force. It not only has suitable stiffness, but also has good seismic performance. The steel-concrete composite beam can achieve structural continuity without welding, which saves a lot of money. The construction cost and construction period are reduced; UHPC has good tensile performance, and for steel-concrete continuous girder bridges, the generation and development of reinforced concrete deck cracks in the negative moment area can be avoided; at the same time, UHPC reduces the thickness of concrete beams, reducing the weight of the bridge.

Description of drawings:

Fig. 1 is the structural representation of the present utility model;

Fig. 2-Fig. 7 is the structural representation of the construction process of the present utility model;

Figure 8a is a front view of the first steel beam or the second steel beam;

Figure 8b is a top view of the first steel beam or the second steel beam;

Figure 8c is a left side view of Figure 8a;

Figure 8d is a right side view of Figure 8a;

Description of symbols in the figure: 1-steel beam, 101-first steel beam, 102-second steel beam, 2-vertical stud, 3-reinforced concrete deck, 4-UHPC deck, 5-steel end Plate, 6-horizontal stud, 7-UHPC beam, 8-permanent bearing, 9-temporary bearing, 10-substructure.

Detailed ways:

The present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

The present utility model adopts the UHPC beam-combined beam structure with stud steel end plate, and the new continuous structure includes a first steel beam 101, a second steel beam 102 with the first ends A close to each other, a temporary steel beam 102 arranged below the first end The support 9, the permanent support 8 and the substructure 10, the upper surfaces of the first steel beam 101 and the second steel beam 102 are arranged with vertical pegs 2, the first steel beam 101 and the second steel beam 102 Steel end plates 5 are respectively fixed on the first end A of the two steel end plates, horizontal bolts 6 are respectively arranged on the opposite surfaces of the two steel end plates, and the opposite surfaces of the two steel end plates are surrounded by the upper end surface of the permanent support. A UHPC beam 7 is poured in the formed space, and the upper part of the UHPC beam 7 extends to the upper surface of the first steel girder and the second steel girder to cast a section of UHPC bridge deck layer 4 respectively. On the upper surface of 102 , reinforced concrete bridge deck layers 3 are respectively poured on the sides of the UHPC bridge deck layer 4 .

Further, in order to make the reinforced concrete bridge deck layer 3, the UHPC bridge deck layer 4 and the UHPC beam 7 firmly connected with the first steel beam 101 and the second steel beam 102, the above-mentioned vertical bolts and horizontal bolts are cylindrical heads. The small end of the cylinder head bolt is welded and fixed on the first steel beam 101 or the second steel beam 102, the distance between the two cylinder head bolts is 10-15 cm, and the height of the cylinder head bolt is 10-15 cm .

Further, in order to design rationally, a substructure 10, a permanent support 8 and a temporary support 9 on the upper surface of the substructure are provided. The substructure 10 is an existing conventional reinforced concrete structure, and the permanent support 8 can be a steel support or rubber. The support, the temporary support 9 may be a concrete block.

Further, in order to realize on-site construction conveniently and quickly, the above-mentioned vertical studs, steel end plates and horizontal studs and the first steel beam or the second steel beam are all prefabricated and welded in the factory, and only need to be welded on site. It can be lifted, installed and poured, which can greatly save construction time.

Further, for good support, the distance between the two steel end plates on the first steel beam and the second steel beam is smaller than the width of the upper end of the lower structure.

The utility model adopts the construction method of the continuous new structure of the UHPC beam-combined beam structure with stud steel end plates, wherein the continuous new structure of the UHPC beam-combined beam structure with stud steel end plates includes the first ends approaching each other. a first steel beam, a second steel beam, a temporary support, a permanent support and a substructure arranged below the first end, the upper surfaces of the first steel beam and the second steel beam are arranged with vertical studs, Steel end plates are respectively fixed on the first ends of the first steel beam and the second steel beam, and horizontal bolts are respectively arranged on the opposite surfaces of the two steel end plates. A UHPC beam is poured in the space enclosed by the upper end face of the permanent support. The upper part of the UHPC beam extends to the upper surface of the first steel beam and the second steel beam to cast a section of the UHPC bridge deck layer. On the upper surface of the second steel beam, a reinforced concrete bridge deck is respectively poured on the side of the UHPC bridge deck;

The construction steps are as follows:

(1) Construction of the substructure 10, establishment and installation of the temporary support 9 and the permanent support 8 (as shown in Figure 2);

(2) Prefabrication of the first steel beam 101 and the second steel beam 102, the ends of the first steel beam and the second steel beam are welded with steel end plates 5, and the upper surfaces of the first steel beam and the second steel beam are welded vertically. Bolt 2, the outer surfaces of the steel end plates of the first steel beam and the second steel beam are welded with horizontal bolts 6 (as shown in Figure 8), and the hoisting equipment is installed and debugged (as shown in Figure 3);

(3) Lift the first steel beam 101 and the second steel beam 102 with the steel end plate 5, the vertical bolt 2 and the horizontal bolt 6; place the first steel beam 101 and the second steel beam 102 on the temporary support On the seat 9, the structure is in a simply supported state at this time (as shown in Figure 4);

(4) Weld the horizontal connection between the first steel beam and the second steel beam, use the first steel beam and the second steel beam as supports, set up a formwork, and pour on the upper surfaces of the first steel beam and the second span steel beam respectively. Reinforced concrete bridge deck layer 3, there is an interval between the reinforced concrete bridge deck layers poured on both sides, and the interval can be 2-5 times the distance between the two steel end plates (as shown in Figure 5);

(5) The UHPC bridge deck layer 4 is poured in the interval between the reinforced concrete bridge deck layers poured on both sides, and the UHPC beam 7 is poured in the space enclosed by the opposite surfaces of the two steel end plates and the upper end surface of the permanent support (As shown in Figure 6);

(6) Remove the temporary support 9, complete the system conversion, and organize the construction of the bridge deck system (as shown in Figure 7).

The advantage of the structure of the utility model is that the vertical studs are welded on the upper surface of the steel beam located in the negative bending moment area of the steel-concrete composite continuous beam and the UHPC bridge deck is poured; The stud is connected to the UHPC beam. This connection method has a simple structure and clear force. It not only has suitable stiffness, but also has good seismic performance. The steel-concrete composite beam can achieve structural continuity without welding, which saves a lot of money. The construction cost and construction period are reduced; UHPC has good tensile performance, and for steel-concrete continuous girder bridges, the generation and development of reinforced concrete deck cracks in the negative moment area can be avoided; at the same time, UHPC reduces the thickness of concrete beams, reducing the weight of the bridge.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than limit them; although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still The specific embodiments of the present invention can be modified or some technical features can be equivalently replaced; without departing from the spirit of the technical solutions of the present invention, all of them should be included in the scope of the technical solutions claimed in the present invention.

Claims (4)

1. a kind of continuous new structure of composite beam structure adopting UHPC cross beam-with stud steel end plate, it is characterized in that: comprise the first steel beam, the second steel beam that the first end is close to each other, be located in the first end The lower temporary support, permanent support and substructure, the upper surface of the first steel beam and the second steel beam are arranged with vertical pegs, the first end of the first steel beam and the second steel beam Steel end plates are respectively fixed on the upper surface, horizontal studs are respectively arranged on the opposite surfaces of the two steel end plates, and UHPC beams are cast in the space enclosed by the opposite surfaces of the two steel end plates and the upper end surface of the permanent support , the upper part of the UHPC beam extends to the upper surface of the first steel girder and the second steel girder to cast a section of UHPC bridge deck layer, which is located on the side of the UHPC bridge deck layer on the upper surface of the first steel girder and the second steel girder Reinforced concrete bridge decks are poured separately. 2 . The continuous new structure of the composite beam structure using the UHPC beam-steel end plate with studs according to claim 1 , wherein the vertical studs and the horizontal studs are both cylindrical-head studs. 3 . 3. The continuous new structure of the composite beam structure using UHPC beam-steel end plate with studs according to claim 1 is characterized in that: the vertical studs, the steel end plates and the horizontal studs are the same as the first steel studs. Either the beam or the second steel beam is prefabricated. 4. The continuous new structure of the composite beam structure using UHPC beam-steel end plate with studs according to claim 1, characterized in that: the two steel end plates on the first steel beam and the second steel beam The distance is less than the width of the upper end of the substructure.

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