Pre-bending construction device for steel-concrete composite beam

Abstract

The utility model belongs to the technical field of bridge construction, and particularly provides a pre-bending construction device of a steel-concrete composite beam, which comprises a counter-force device, two tensioning pieces and a steel wire rope, the left end and the right end of a steel beam are connected with one end of one tensioning piece, the counter-force piece is connected with the middle of the steel beam, and the other ends of the two tensioning pieces are connected through the steel wire rope penetrating through the counter-force device. The problems that an existing self-balancing type pre-bending method is limited in effect and affected by the weight of a structure and distribution of the internal force state of a steel beam is solved, cable penetrating jacks on the two sides are adopted for symmetrical tensioning in the overall pre-bending construction process, a midspan counter-force jack is used for counteracting the dead weight of bridge deck concrete, overall pre-bending of the steel beam is achieved, and the construction efficiency is improved. The stress continuity of the steel beam is ensured, the pre-bending state of the steel beam is not influenced by the concrete pouring process, and the combination quality of the steel-concrete composite beam is effectively ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, and in particular relates to a pre-bending construction device for a steel-concrete composite beam. Background Art

[0002] Steel-concrete composite beams are widely used in small and medium span bridges due to their superior performance and strong bearing capacity. The pre-bending construction technology of steel beams has been mature in cladding beams, but it is still not perfect for upper and lower composite steel-concrete composite beams. The traditional construction method is to set a temporary support at the mid-span of the steel beam as the force application point for the anti-bending steel beam, but due to geological and topographical conditions, traffic under the bridge, etc., the pre-bending construction of composite beams has great limitations. Some scholars have also envisioned arranging supports and shoulder beams at the mid-span of the bottom of the steel beam, and applying prestress to the steel beam through pre-bending supports and pre-bending tensioning members to achieve the effect of local pre-bending of the steel beam, but due to the large stiffness of the steel beam itself, this self-balancing pre-bending method has limited effect, and is affected by the weight of the structure itself, which affects the distribution of the internal force state of the steel beam.

[0003] The Chinese patent document with the publication number CN108457195A discloses a pre-bending construction method for a steel-concrete composite beam bridge, which is used in the field of bridge construction technology and includes the following steps: S10. Installing a steel beam, setting a pre-bending beam along the longitudinal direction of the bridge under the steel beam, and directly or indirectly connecting the two ends of the pre-bending beam to the steel beam through pre-bending tensioning members; S20. Setting a pre-bending support member on the pre-bending beam at the mid-span position of the steel beam; S30. Pre-bending the steel beam by tensioning the pre-bending tensioning member and / or lifting the pre-bending support member; S40. Pouring concrete on the steel beam to form a concrete bridge deck. A pre-bending beam is set under the bridge, and the pre-bending beam is connected to the steel beam through the pre-bending tensioning member. A pre-bending support member is set between the span of the pre-bending beam and the steel beam. The pre-bending tensioning members at both ends of the pre-bending beam and / or the prestressed force-applying members on the pre-bending support member are used to give the steel beam a pre-bending force, thereby avoiding the erection of temporary brackets (piers) and not causing excessive impact on the passage of vehicles under the bridge, which provides great convenience for construction. This document does not solve the problem that the self-balancing pre-bending method in the prior art has limited effect and is affected by the weight of the structure itself, which affects the distribution of the internal force state of the steel beam. Utility Model Content

[0004] The utility model provides a pre-bending construction device for a steel-concrete composite beam, which aims to overcome the problem that the self-balancing pre-bending method in the prior art has limited effect and is affected by the weight of the structure itself, thus affecting the distribution of the internal force state of the steel beam.

[0005] To this end, the utility model provides a pre-bending construction device for a steel-concrete composite beam, the pre-bending construction device is connected with a steel beam, the steel beam includes an upper plate and a web, the upper plate is horizontally arranged, and the middle lower part of the upper plate is vertically connected to the web, the pre-bending construction device includes a reaction device, two tensioning members and a steel wire rope, the left and right ends of the steel beam are connected to one end of a tensioning member, the reaction member is connected to the middle part of the steel beam, and the other ends of the two tensioning members are connected by a steel wire rope passing through the reaction device.

[0006] Preferably, the reaction device includes two reaction members, and the two reaction members are symmetrically distributed front and back with the web as the center.

[0007] Preferably, the reaction member comprises a reaction frame, a reaction jack and a joint, the rear of the reaction frame is connected to the web, and the bottom of the reaction frame is connected to the joint through the reaction jack.

[0008] Preferably, the reaction frame includes multiple transverse ribs, multiple vertical ribs, a connecting plate and a bottom transverse rib, the back of the connecting plate is connected to the web, the front of the connecting plate is connected to the multiple vertical ribs, the multiple vertical ribs are vertically distributed from left to right, the multiple vertical ribs are connected by multiple transverse ribs, the multiple transverse ribs are distributed from top to bottom, the bottom of the multiple vertical ribs are connected to the bottom transverse ribs, the multiple transverse ribs and the bottom transverse ribs are both transversely connected to the connecting plate, and the bottom transverse ribs are connected to the reaction jack.

[0009] Preferably, a plurality of connection holes are provided on the connection plate.

[0010] Preferably, the reaction frame further includes shear bolts, which are connected in the connecting holes.

[0011] Preferably, the connecting plate and the web are connected by bolt welding.

[0012] Preferably, the tensioning member includes an anchor plate and two cable jacks, the rear of the anchor plate is connected to the left end or the right end of the steel beam, the front of the anchor plate is connected to the two cable jacks, and the two cable jacks are symmetrically distributed front and back with the web as the center.

[0013] Preferably, the steel wire rope is anchored to a wire-threading jack.

[0014] Preferably, the tensioning member further includes an anchor clamp, and the steel wire rope is connected to the cable jack via the anchor clamp.

[0015] Beneficial effects of the utility model:

[0016] 1. The pre-bending construction device for the steel-concrete composite beam provided by the utility model includes a reaction device, two tensioning members and a steel wire rope. The left and right ends of the steel beam are connected to one end of a tensioning member, the reaction member is connected to the middle of the steel beam, and the other ends of the two tensioning members are connected by a steel wire rope passing through the reaction device. When in use, the steel beam is symmetrically tensioned by the tensioning members on both sides until it reaches the designed pre-bending height, and the bridge deck concrete in the mid-span area is poured. During the pouring process, the reaction device is used to eliminate the influence of the concrete deadweight load on the pre-bending state of the steel beam, effectively ensuring the bonding quality of the steel-concrete composite beam. The effect of pre-bending the steel beam is achieved by tensioning the steel wire rope, which is convenient to construct, not restricted by environmental factors, has little interference with construction, and has no impact on traffic. The utility model can pre-bend the steel beam, which can be assembled in advance and installed on site, with a high degree of automation and economical and efficient operation; the device itself has a small weight and has little impact on the initial state of the steel beam before the pre-bending construction; the overall pre-bending of the steel beam can be achieved to ensure the continuity of the force on the steel beam; the pre-bending of the steel beam can effectively improve the force condition of the steel-concrete composite beam, form a pre-pressure on the bridge deck, and optimize the internal force state of the structure.

[0017] 2. In the pre-bending construction device for the steel-concrete composite beam provided by the utility model, the connecting plate and the web are connected by bolt welding to increase the overall shear resistance effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] Figure 1 It is the structural front view of the pre-bending construction device of the steel-concrete composite beam;

[0020] Figure 2 yes Figure 1 Sectional view of AA in the middle;

[0021] Figure 3 It is the right side view of the steel beam connected with the tension member;

[0022] Figure 4 It is a structural stereogram of the reaction member;

[0023] Figure 5 It is a three-dimensional diagram of the structure where the tension member connects the steel beam;

[0024] Figure 6 It is the structural front view of the reaction frame.

[0025] Description of reference numerals: 1. steel beam; 2. reaction member; 3. tension member; 4. steel wire rope;

[0026] 1.1. Upper plate; 1.2. Web plate;

[0027] 2.1. Reaction frame; 2.2. Reaction jack; 2.3. Connector;

[0028] 2.11, transverse rib; 2.12, vertical rib; 2.13, connecting plate; 2.14, bottom transverse rib; 2.15, shear bolt;

[0029] 2.131, connection hole;

[0030] 3.1. Anchor plate; 3.2. Rope jack; 3.3. Anchor clamp. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] Embodiment 1:

[0033] like Figure 1 As shown, a pre-bending construction device for a steel-concrete composite beam is connected with a steel beam 1, the steel beam 1 includes an upper plate 1.1 and a web 1.2, the upper plate 1.1 is arranged horizontally, and the lower middle part of the upper plate 1.1 is vertically connected to the web 1.2, the pre-bending construction device includes a reaction device, two tensioning members 3 and a steel wire rope 4, the left and right ends of the steel beam 1 are connected to one end of a tensioning member 3, the reaction member 2 is connected to the middle part of the steel beam 1, and the other ends of the two tensioning members 3 are connected by a steel wire rope 4 passing through the reaction device.

[0034] Specifically, when in use, the steel beam 1 is symmetrically tensioned by the tensioning members 3 on both sides until it reaches the designed pre-bending height, and the bridge deck concrete is poured in the mid-span area. During the pouring process, the reaction device is used to eliminate the influence of the concrete deadweight load on the pre-bending state of the steel beam 1, effectively ensuring the bonding quality of the steel-concrete composite beam. The effect of pre-bending the steel beam 1 is achieved by tensioning the steel wire rope 4, and the construction is convenient, not restricted by environmental factors, and the interference to the construction is small, and there is no impact on traffic. The utility model can pre-bend the steel beam, which can be assembled in advance and installed on site, with a high degree of automation and economic efficiency; the device itself has a small weight, and has little effect on the initial state of the steel beam before the pre-bending construction; it can achieve overall pre-bending of the steel beam to ensure the continuity of the force on the steel beam; the pre-bending of the steel beam can effectively improve the force condition of the steel-concrete composite beam, form a pre-stress on the bridge deck, and optimize the internal force state of the structure.

[0035] Embodiment 2:

[0036] On the basis of Example 1, Figure 2 and Figure 4 As shown, the reaction device comprises two reaction members 2, and the two reaction members 2 are symmetrically distributed front and back with the web 1.2 as the center.

[0037] This structure ensures that after the reaction device is connected to the web plate 1.2, the entire device is subjected to balanced force, thereby improving the overall stability and stability during use.

[0038] Preferably, the reaction member 2 comprises a reaction frame 2.1, a reaction jack 2.2 and a joint 2.3, the rear of the reaction frame 2.1 is connected to the web 1.2, and the bottom of the reaction frame 2.1 is connected to the joint 2.3 through the reaction jack 2.2.

[0039] Specifically, this structure facilitates the reaction frame 2.1 to provide support for the reaction jack 2.2. The piston of the reaction jack 2.2 is provided with a joint 2.3, and the joint 2.3 facilitates the limiting and guiding of the steel wire rope.

[0040] Preferably, the reaction frame 2.1 includes a plurality of transverse ribs 2.11, a plurality of vertical ribs 2.12, a connecting plate 2.13 and a bottom transverse rib 2.14, the back of the connecting plate 2.13 is connected to the web 1.2, the front of the connecting plate 2.13 is connected to the plurality of vertical ribs 2.12, the plurality of vertical ribs 2.12 are vertically distributed from left to right, the plurality of vertical ribs 2.12 are connected by a plurality of transverse ribs 2.11, the plurality of transverse ribs 2.11 are distributed at intervals from top to bottom, the bottom of the plurality of vertical ribs 2.12 is connected to the bottom transverse rib 2.14, the plurality of transverse ribs 2.11 and the bottom transverse rib 2.14 are both laterally connected to the connecting plate 2.13, and the bottom transverse rib 2.14 is connected to the reaction jack 2.2.

[0041] Specifically, the reaction frame 2.1 of this structure is simple in structure, light in weight and good in stability, and the bottom transverse rib 2.14 is convenient for providing support for the reaction jack 2.2.

[0042] Embodiment 3:

[0043] On the basis of Example 2, Figure 6 As shown, the connecting plate 2.13 is provided with a plurality of connecting holes 2.131.

[0044] Specifically, the plurality of connection holes 2.131 facilitates the connection of the bolted web 1.2.

[0045] Preferably, the web 1.2 is provided with a plurality of holes, which facilitate bolting of the connecting plate 2.13.

[0046] Preferably, the reaction frame 2.1 further comprises a shear bolt 2.15, and the shear bolt 2.15 is connected in the connecting hole 2.131.

[0047] Specifically, when in use, after the connection hole 2.131 is aligned with the hole on the web 1.2, the shear bolt 2.15 is passed through to tighten and fix.

[0048] Preferably, the connecting plate 2.13 and the web 1.2 are connected by bolt welding.

[0049] Specifically, the anti-connecting plate 2.13 and the web 1.2 are connected by bolt welding, that is, a hole is pre-drilled at the web 1.2 position in the middle of the steel beam 1, and after the connecting plate 2.13 is installed in place, it is fixed with shear bolts 2.15, and then the released part between the steel beam 1 and the connecting plate 2.13 is welded to increase the overall shear resistance effect.

[0050] Preferably, Figure 3 and Figure 5 As shown, the tensioning member 3 includes an anchor plate 3.1 and two cable jacks 3.2. The rear of the anchor plate 3.1 is connected to the left end or the right end of the steel beam 1, and the front of the anchor plate 3.1 is connected to the two cable jacks 3.2. The two cable jacks 3.2 are symmetrically distributed front and back with the web 1.2 as the center.

[0051] Specifically, the anchor plate 3.1 is fixed to the end section of the steel beam by welding. The anchor plate 3.1 is arranged in the upper area of ​​the steel beam. In order to increase the bearing capacity of the steel beam, multiple groups of transverse and longitudinal ribs welded on the top and web of the steel beam can be appropriately added to increase the pressure-bearing area of ​​the steel beam section. The anchor plate 3.1 provides support for the cable jack 3.2.

[0052] Preferably, the steel wire rope 4 is anchored to the wire jack 3.2. The anchoring connection ensures that the steel wire rope 4 contracts evenly, protects the steel wire rope, and prolongs the service life of the steel wire rope.

[0053] Preferably, the steel wire rope 4 is a prestressed steel strand, which is composed of a plurality of steel wire bundles. According to the cross-sectional size of the steel beam, the number of wire strands can be appropriately increased or decreased to ensure the pre-bending quality.

[0054] Specifically, there is a set of steel wire ropes 4 on both the front and rear sides of the web 1.2; one end of one set of steel wire ropes is connected to a cable jack 3.2 in front of the web 1.2, and the other end of one set of steel wire ropes is connected to another cable jack 3.2 in front of the web 1.2 after passing through the front joint 2.3 of the web 1.2; one end of another set of steel wire ropes is connected to a cable jack 3.2 behind the web 1.2, and the other end of another set of steel wire ropes is connected to another cable jack 3.2 behind the web 1.2 after passing through the rear joint 2.3 of the web 1.2. Before installing the steel wire ropes, perform initial marking and tensioning end marking, adjust the steel wire ropes to the initial position before tensioning, keep the mid-span position unchanged, tension symmetrically on both sides in batches, and stop tensioning when the tensioning end mark is reached.

[0055] Preferably, the tensioning member 3 further comprises an anchor clamp 3.3, and the steel wire rope 4 is connected to the cable jack 3.2 via the anchor clamp 3.3. The structure is simple, the anchoring is convenient, and the stability is good.

[0056] The construction method of the utility model comprises the following steps:

[0057] 1) Hoist the steel beam 1 and drill a hole at the marked position of the web 1.2 (the position for installing the reaction piece 2);

[0058] 2) Install the reaction piece 2: Install the reaction piece 2 at the hole, use bolts (shear bolts 2.15) to install the hole, and weld the contact part between the connecting plate 2.13 and the web 1.2 to increase the strength;

[0059] 3) Install the tensioning member 3: install the tensioning member 3 at the left and right ends of the steel beam 1; specifically, the tensioning member 3 is integrally welded to the two ends of the steel beam near the upper plate 1.1;

[0060] 4) Install the steel wire rope 4: one end of one set of steel wire ropes is connected to a wire jack 3.2 in front of the web 1.2, and the other end of one set of steel wire ropes is connected to another wire jack 3.2 in front of the web 1.2 after passing through the joint 2.3 in front of the web 1.2; one end of another set of steel wire ropes is connected to a wire jack 3.2 behind the web 1.2, and the other end of another set of steel wire ropes is connected to another wire jack 3.2 behind the web 1.2 after passing through the joint 2.3 behind the web 1.2; after adjusting to the initial position, install the anchor clamp and clamp it;

[0061] 5) Use cable jacks 3.2 at both ends to symmetrically tension the steel beam until it reaches the designed pre-bending height, and then tighten the anchor clamps for temporary fixation;

[0062] 6) Pour the bridge deck concrete in the mid-span area, and use the reaction jack 2.2 during the pouring process to eliminate the influence of the concrete deadweight load on the pre-bending state of the steel beam 1;

[0063] 7) After the construction of the composite beam is completed, the reaction jack 2.2 is first unloaded, and then the cable jacks 3.2 at both ends are unloaded synchronously and symmetrically. Finally, the pre-bending tensioning equipment is removed to reinforce the holes in the steel beam.

[0064] In the description of the present invention, it should be understood that the terms "left", "inside", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations on the present invention.

[0065] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A pre-bending construction device for a steel-concrete composite beam, the pre-bending construction device being connected with a steel beam (1), the steel beam (1) comprising an upper plate (1.1) and a web plate (1.2), the upper plate (1.1) being arranged transversely, and the lower middle portion of the upper plate (1.1) being vertically connected to the web plate (1.2), characterized in that: The pre-bending construction device comprises a reaction device, two tensioning members (3) and a steel wire rope (4); the left and right ends of the steel beam (1) are connected to one end of a tensioning member (3); the reaction member (2) is connected to the middle of the steel beam (1); and the other ends of the two tensioning members (3) are connected via a steel wire rope (4) passing through the reaction device.

2. The pre-bending construction device for steel-concrete composite beams according to claim 1, characterized in that: The reaction force device comprises two reaction force members (2), and the two reaction force members (2) are symmetrically distributed front and back with the web (1.2) as the center.

3. The pre-bending construction device for steel-concrete composite beams according to claim 2, characterized in that: The reaction member (2) comprises a reaction frame (2.1), a reaction jack (2.2) and a joint (2.3); the rear of the reaction frame (2.1) is connected to the web (1.2), and the bottom of the reaction frame (2.1) is connected to the joint (2.3) via the reaction jack (2.2).

4. The pre-bending construction device for steel-concrete composite beams according to claim 3, characterized in that: The reaction frame (2.1) comprises a plurality of transverse ribs (2.11), a plurality of vertical ribs (2.12), a connecting plate (2.13) and a bottom transverse rib (2.14); the rear of the connecting plate (2.13) is connected to the web (1.2); the front of the connecting plate (2.13) is connected to the plurality of vertical ribs (2.12); the plurality of vertical ribs (2.12) are vertically distributed at intervals from left to right; the plurality of vertical ribs (2.12) are connected to each other via a plurality of transverse ribs (2.11); the plurality of transverse ribs (2.11) are distributed at intervals from top to bottom; the bottom of the plurality of vertical ribs (2.12) is connected to the bottom transverse rib (2.14); the plurality of transverse ribs (2.11) and the bottom transverse rib (2.14) are both transversely connected to the connecting plate (2.13); and the bottom of the bottom transverse rib (2.14) is connected to the reaction jack (2.2).

5. The pre-bending construction device for steel-concrete composite beams according to claim 4, characterized in that: The connecting plate (2.13) is provided with a plurality of connecting holes (2.131).

6. The pre-bending construction device for steel-concrete composite beams according to claim 5, characterized in that: The reaction frame (2.1) further comprises a shear bolt (2.15), wherein the shear bolt (2.15) is connected to the connection hole (2.131).

7. The pre-bending construction device for steel-concrete composite beams according to claim 4, characterized in that: The connecting plate (2.13) and the web (1.2) are connected by bolt welding.

8. The pre-bending construction device for steel-concrete composite beams according to claim 1, characterized in that: The tensioning member (3) comprises an anchor plate (3.1) and two cable-threading jacks (3.2); the rear of the anchor plate (3.1) is connected to the left end or the right end of the steel beam (1); the front of the anchor plate (3.1) is connected to the two cable-threading jacks (3.2); the two cable-threading jacks (3.2) are symmetrically distributed front and back with the web (1.2) as the center.

9. The pre-bending construction device for steel-concrete composite beams according to claim 8, characterized in that: The steel wire rope (4) is anchored and connected to the wire-threading jack (3.2).

10. The pre-bending construction device for steel-concrete composite beams according to claim 9, characterized in that: The tensioning member (3) further comprises an anchor clamp (3.3), and the steel wire rope (4) is connected to the wire-threading jack (3.2) via the anchor clamp (3.3).

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