CN103215894B - Portable interim prestressed stretch-draw anchor block - Google Patents

Abstract

The invention relates to a mobile temporary prestressed tension anchor block. Concrete anchor blocks are used for temporary prestressed tensioning of conventional segmental prefabricated assembled bridges, which cannot be moved and reused for many times. The anchor block of the present invention is provided with a bottom plate, and the bottom plate is fixed on the prefabricated segmental box girder through pre-embedded fasteners. Two opposite anchor plates are welded upright on the upper surface of the bottom plate, and two ribs perpendicular to the anchor plates are welded between the anchor plates. The anchor plate is provided with the through hole of the anchor plate through which the prestressed thick steel bar is pierced; the prestressed thick steel bar is pierced in the four anchor plates of the two anchor blocks on the two adjacent prefabricated segmental box girders, and the ends pass through The prestressed thick steel wire tie anchor is fixed on the anchor plate at the far end of two adjacent anchor blocks. The invention has simple structure, high rigidity, low cost, convenient construction, can be disassembled, moved and reused for many times, and has good versatility.

Description

Movable temporary prestressed tension anchor block

technical field

    The invention belongs to the technical field of road traffic construction, and in particular relates to a mobile temporary prestressed tension anchor block.

Background technique

The construction method of the glue joint segmental prefabricated assembled bridge is to divide the beam body into several segmental units along the longitudinal direction of the bridge for factory production, and then transport them to the bridge site segment by segment, and build them on the mobile bracket bridge building machine or the mobile hanging basket. For assembly, the joints between the segments are sealed with epoxy resin, and the epoxy resin sealant is squeezed between the segments by tensioning temporary prestressing, and then the prefabricated segments are connected into a whole by tensioning permanent prestressing. The temporary tension prestress is removed to complete the construction of a segment or one-hole beam, and so on until the construction of the whole bridge is completed.

At present, concrete anchor blocks are used for temporary prestressed tensioning of conventional segmental prefabricated assembled bridges, which cannot be moved and reused many times. In the concrete anchor block, it is necessary to bury anchors, spiral bars and reserve channels. The construction sequence is complicated, the equipment utilization rate is low, the economy is not high, the bridge is not easy to dismantle after forming, the aesthetics is poor, and it is not conducive to environmental protection.

Contents of the invention

The object of the present invention is to provide a removable temporary prestressed tension anchor block for segmental prefabricated and assembled bridges, which can be disassembled, moved and reused.

The technical scheme adopted in the present invention is:

A mobile temporary prestressed tension anchor block, characterized in that:

The anchor block is provided with a bottom plate, and the bottom plate is fixed on the prefabricated segmental box girder through embedded fasteners. Two opposite anchor plates are welded upright on the upper surface of the bottom plate, and two rib plates perpendicular to the anchor plates are welded between the anchor plates. , the anchor plate is provided with the anchor plate through hole through which the prestressed thick steel bar is pierced.

The embedded fasteners include embedded leveling steel plates, U-shaped embedded bolts and bolt nuts;

The pre-embedded leveling steel plate is preset in the prefabricated segmental box girder under the bottom plate, and the base plate and the pre-embedded leveling steel plate are provided with corresponding bolt holes, and the pre-embedded bolts preset in the prefabricated segmental box girder pass through The bolt holes of the two are fixed with the bolt nuts on the top of the base plate.

The ribs are fixed to the bottom plate by welding.

The prestressed thick steel bars are installed in the four anchor plates of the two anchor blocks on the two adjacent prefabricated section box girders, and the ends of the prestressed thick steel bars are fixed on the adjacent two anchor blocks by the prestressed thick steel bars. anchor plate on the distal end of the anchor block.

The present invention has the following advantages:

The anchor block adopted in the present invention is simple in structure, high in rigidity, can be disassembled and moved for repeated use, convenient in construction, high in economy, good in versatility, saves prestressed anchor pads and spiral tendons, and the prestressed anchor is directly placed on the anchor block. Anchoring on the anchor plate saves steel consumption, which is more conducive to environmental protection and saves investment.

Description of drawings

Figure 1 is a cross-sectional layout diagram of the anchor block tensioned and anchored in the prefabricated segmental box girder.

Fig. 2 is a side layout diagram of the anchor block tensioned and anchored in the prefabricated segmental box girder.

Figure 3 is the front view of the anchor block (II-II sectional view).

Figure 4 is a side view of the anchor block (I-I sectional view).

In the figure, 1-rib plate, 2-bolt nut, 3-bottom plate, 4-embedded leveling steel plate, 5-embedded bolt, 6-prefabricated segmental box girder, 7-anchor plate, 8-prestressed rough Reinforcement wire tie anchor, 9- prestressed thick steel bar.

Detailed ways

The present invention will be described in detail below in combination with specific embodiments.

A mobile temporary prestressed tension anchor block involved in the present invention is provided with a bottom plate 3, and the bottom plate 3 is fixed on the prefabricated segmental box girder 6 through pre-embedded fasteners. The pre-embedded firmware includes a pre-embedded leveling steel plate 4, U-shaped pre-embedded bolts 5 and bolts and nuts 2. The pre-embedded leveling steel plate 4 is preset in the prefabricated segmental box girder 6 below the bottom plate 3, and the bottom plate 3 and the pre-embedded The leveling steel plates 4 are provided with corresponding bolt holes, and the pre-embedded bolts 5 preset in the prefabricated segmental box girder 6 pass through the bolt holes of both, and are fixed with the bolt nuts 2 above the bottom plate 3 . Multiple groups of embedded bolts 5 can be provided, such as four groups as shown in FIG. 2 , to strengthen the fixing effect of the anchor block on the prefabricated segmental box girder 6 .

Two opposite anchor plates 7 are welded upright on the upper surface of the bottom plate 3, and two ribs 1 perpendicular to the anchor plates 7 are welded between the anchor plates 7. The ribs 1 can also be welded and fixed with the bottom plate 3 to strengthen the anchor block. stiffness. Anchor plate 7 is provided with anchor plate through holes through which prestressed thick steel bars 9 are laid, and is arranged in a staggered manner. Both sides can be tensioned and temporarily prestressed, which can be used as both tension end anchor block and fixed end anchor block. As shown in Figure 3, the diamond-shaped arrangement adopted by the four anchor plate through holes. The two prestressed thick steel bars 9 are installed in the four anchor plates 7 of the two anchor blocks on the two adjacent prefabricated section box girders 6, and the ends of the prestressed thick steel bars 9 are tied to the anchor 8 by the prestressed thick steel bars. Be fixed on the anchor plates 7 at the far ends of two adjacent anchor blocks. For example, the three prefabricated segmental box girders of a, b, and c, if a group of prestressed thick steel bars 9 between the prefabricated segmental box girders of a and b are arranged in the vertical direction, then the prefabricated segmental box girders of b and c A group of prestressed thick steel bars 9 between the beams 6 are arranged horizontally.

The construction steps of the mobile temporary prestressed tension anchor block involved in the present invention are as follows:

1. The embedded bolts 5 and the embedded leveling steel plates 6 are preset during the prefabrication of the box girder segment.

2. Drill holes according to the designed positions on the bottom plate 3 and anchor plate 7 prepared by blanking, and weld the bottom plate 3, rib plate 1, and anchor plate 7 into a whole anchor block.

3. The combined steel anchor block is installed on the top and bottom plates of the prefabricated segmental box girder requiring tension and prestress through embedded bolts 5 and bolts and nuts 2.

4. The prefabricated segmental box girder is pre-assembled in place, and after epoxy resin is applied on the joint surface, the prestressed thick steel bar 9 is worn, and the prestressed thick steel bar is stretched to the design tension, and the prestressed thick steel bar is tied with wire anchor 8.

5. After the assembly of the whole hole beam is completed, after the permanent prestressing is tensioned, the overall anchor block is removed, and the cycle is followed in step 2 until all the segmental beams are assembled.

When tensioning temporary prestressing, the mobile anchor block is fixed on the prefabricated segmental box girder through embedded fasteners. After the tensioning is completed, it is removed and moved to the next segment where temporary prestressing is required.

The content of the present invention is not limited to the examples listed, and any equivalent transformation of the technical solution of the present invention adopted by those of ordinary skill in the art by reading the description of the present invention is covered by the claims of the present invention.

Claims (1)

1. portable interim prestressed stretch-draw anchor block, is characterized in that:

Described anchor block is provided with base plate (3), base plate (3) is fixed on prefabricated subsection case beam (6) by pre-buried firmware, base plate (3) upper surface is uprightly welded with two pieces of relative anchor slabs (7), be welded with two pieces of floors (1) perpendicular to anchor slab (7) between anchor slab (7), anchor slab (7) be provided with the anchor slab through hole wearing prestressed thick reinforcement (9);

Described pre-buried firmware comprises pre-buried leveling steel plate (4), the pre-embedded bolt (5) of U-shaped and bolt nut (2);

Pre-buried leveling steel plate (4) is preset in the prefabricated subsection case beam (6) of base plate (3) below, base plate (3) and pre-buried leveling steel plate (4) are provided with bolt duct corresponding to position, be preset in pre-embedded bolt (5) in prefabricated subsection case beam (6) the bolt duct through both, and the bolt nut (2) of base plate (3) top fixes;

Described floor (1) and base plate (3) are welded and fixed;

Described anchor block is provided with four on single-unit prefabricated subsection case beam (6), and wherein two are positioned at the position of the corresponding web of prefabricated subsection case beam (6) top board, lateral symmetry, and two other is positioned at prefabricated subsection case beam (6) base plate, lateral symmetry;

Be provided with two between the corresponding anchor block of adjacent two joints prefabricated subsection case beam (6) vertically or the prestressed thick reinforcement (9) of horizontal arrangement, the termination of prestressed thick reinforcement (9) is fixed on the anchor slab (7) of corresponding anchor block far-end by prestressed thick reinforcement tied silk anchor (8);

One joint prefabricated subsection case beam (6) be positioned at two prestressed thick reinforcements (9) arranged between the corresponding anchor block of the prefabricated subsection case beam (6) of its side and vertically arrange, then this joint prefabricated subsection case beam (6) be positioned at two prestressed thick reinforcement (9) horizontal arrangement arranged between the corresponding anchor block of the prefabricated subsection case beam (6) of its opposite side;

The termination of the prestressed thick reinforcement (9) of vertical layout is positioned between floor (1), and the termination of the prestressed thick reinforcement (9) of horizontal arrangement is positioned at outside floor (1) two.