Oblique crossing two-way prestress cement concrete prefabricated slab structure

Abstract

The oblique-crossing bidirectional prestressed cement concrete prefabricated slab structure comprises concrete, longitudinal prestressed tendons, transverse prestressed tendons and special-shaped anchor bearing plates, the special-shaped anchor bearing plates are fixed in the four side faces of a cement concrete prefabricated slab, and the two ends of the longitudinal prestressed tendons and the two ends of the transverse prestressed tendons are anchored to the special-shaped anchor bearing plates through anchorage devices; the anti-cracking structure is characterized in that a plurality of longitudinal anti-cracking ribs and transverse anti-cracking ribs are arranged on the periphery, close to the edge, of the cement concrete prefabricated slab, and anchor inner spiral ribs penetrating through the ends of the longitudinal prestressed ribs and the transverse prestressed ribs are fixed to the inner side face of the special-shaped anchor bearing plate. According to the cement concrete prefabricated slab structure, the longitudinal anti-cracking ribs, the transverse anti-cracking ribs and the anchor inner spiral ribs effectively increase the tensile strength and the compressive strength of the edge position of the prefabricated slab, cracking of the cement concrete prefabricated slab can be effectively avoided, corrosion of steel bars in the prefabricated slab is avoided, and the service life of the prefabricated slab is guaranteed.

Description

Technical Field

[0001] The utility model relates to a cement concrete prefabricated board structure, in particular to an oblique bidirectional prestressed cement concrete prefabricated board structure. Background Art

[0002] With the rapid development of my country's economy, heavy-load traffic continues to grow. Non-rectangular oblique reinforced concrete slabs (i.e. reinforced concrete precast slabs) are needed at the connection points between the front wall of the bridge and the road. At present, obliquely staggered non-prestressed steel bars are used in the oblique reinforced concrete slabs. If the roadbed under the precast slab settles, the non-prestressed bars in the precast slab cannot guarantee good tensile strength.

[0003] However, in actual use, the road surface composed of oblique reinforced concrete slabs is prone to cracking under the action of vehicle loads, and the steel bars in the cracked reinforced concrete precast panels are prone to corrosion, thereby shortening the service life of the precast panels. Therefore, there is an urgent need for an oblique bidirectional prestressed cement concrete precast panel structure with strong bearing capacity, which is not prone to cracks during use, thereby extending the service life of the precast panels. At present, there is still a lack of corresponding solutions for the oblique bidirectional prestressed cement concrete precast panel structure. Summary of the invention

[0004] In order to overcome the disadvantages of the above technical problems, the utility model provides an oblique bidirectional prestressed cement concrete prefabricated board structure.

[0005] The utility model discloses an oblique bidirectional prestressed cement concrete precast plate structure, comprising concrete and longitudinal prestressed tendons, transverse prestressed tendons and special-shaped anchor pads cast in the concrete, wherein the longitudinal prestressed tendons and transverse prestressed tendons are arranged at equal intervals and parallel to the longitudinal edges and transverse edges of the cement concrete precast plate, and the special-shaped anchor pads are fixed in the concrete on the inner sides of the four side surfaces of the cement concrete precast plate, and both ends of the longitudinal prestressed tendons and transverse prestressed tendons are anchored on the special-shaped anchor pads through anchors; the utility model is characterized in that: a plurality of longitudinal anti-cracking tendons and transverse anti-cracking tendons are arranged near the edges around the cement concrete precast plate, and the plurality of longitudinal anti-cracking tendons and transverse anti-cracking tendons are tied and fixed by stirrups arranged at equal intervals; and an inner spiral anchor bar through which the ends of the longitudinal prestressed tendons and transverse prestressed tendons pass is fixed on the inner side surface of the special-shaped anchor pad.

[0006] The utility model discloses an oblique bidirectional prestressed cement concrete precast panel structure, wherein the longitudinal prestressed tendons are arranged in upper and lower double rows with equal transverse spacing, and the transverse prestressed tendons are arranged in a single row with equal longitudinal spacing, and the transverse prestressed tendons are located below the central axis of the cement concrete precast panel; the longitudinal anti-cracking tendons and the transverse anti-cracking tendons are composed of three rows and three columns, totaling 9 secondary steel bars.

[0007] The utility model discloses an oblique bidirectional prestressed cement concrete prefabricated plate structure, wherein the spiral reinforcement in the anchor is a spiral reinforcement with a spiral diameter of 6 cm to 8 cm, a spiral pitch of 3 cm to 5 cm, and a length of not less than 20 cm.

[0008] The utility model discloses an oblique bidirectional prestressed cement concrete prefabricated slab structure, wherein the special-shaped anchor pad is composed of a bottom plate, a long vertical plate, a short vertical plate, an upper flat plate and a lower flat plate, the bottom plate is vertically arranged, the long vertical plate and the short vertical plate are welded to the left and right edge positions of the outer side surface of the bottom plate, the long vertical plate is perpendicular to the bottom plate, and the angle between the short vertical plate and the bottom plate is an obtuse angle; the upper flat plate and the lower flat plate are vertically welded to the upper and lower edge positions of the outer side surface of the bottom; the angle between the short vertical plate and the bottom plate is equal to the obtuse angle of the cement concrete prefabricated slab, the two opposite angles of the upper flat plate and the lower flat plate are right angles, and the other two opposite angles are acute angles and obtuse angles, and the obtuse angles and acute angles of the upper flat plate and the lower flat plate are respectively equal to the acute angle and obtuse angle of the cement concrete prefabricated slab; a circular hole through which the end of the longitudinal prestressed tendon or the end of the transverse prestressed tendon passes is opened at the middle edge of the bottom plate.

[0009] The utility model discloses an oblique bidirectional prestressed cement concrete prefabricated plate structure, wherein the bottom plate is square, the thickness of the bottom plate is not less than 1 cm, the side length is not less than 8 cm, and the diameter of the circular hole is 1.6 cm; the embedded position of the bottom plate on the special-shaped anchor pad is perpendicular to the longitudinal prestressed tendons or the transverse prestressed tendons.

[0010] The utility model discloses an oblique bidirectional prestressed cement concrete prefabricated plate structure, wherein four anchoring bars with hooks at the ends are fixed on the inner side surface of the bottom plate on the special-shaped anchor pad.

[0011] The utility model discloses an oblique bidirectional prestressed cement concrete prefabricated plate structure, wherein the strength grade of the concrete is 35MPa-45MPa.

[0012] The beneficial effects of the utility model are as follows: the cement concrete precast panel structure of the utility model is provided with longitudinal and transverse prestressed tendons, longitudinal and transverse anti-cracking tendons, special-shaped anchor pads and spiral tendons cast in concrete, the longitudinal and transverse prestressed tendons are respectively parallel to the longitudinal and transverse edges of the precast panel and are anchored to the special-shaped anchor pads through anchors, so that when tensile stress is applied to the longitudinal and transverse prestressed tendons, the longitudinal and transverse prestressed tendons will apply stress to the precast panel through the special-shaped anchor pads, and the precast panel with compressive prestress can offset the stress of the vehicle during driving. The tensile stress it generates makes the cement concrete precast slabs usable as road slabs or claddings; by burying multiple longitudinal and transverse anti-cracking bars near the edges around the precast slabs, the tensile and compressive strengths at the edges of the precast slabs are effectively increased, which can effectively avoid cracking of the cement concrete precast slabs, avoid corrosion of the steel bars in the precast slabs, and ensure the service life of the precast slabs; at the same time, by fixing the spiral reinforcement in the anchor on the inner side of the special-shaped anchor pad, the compressive strength of the concrete in the spiral reinforcement under the special-shaped anchor pad is increased, avoiding cracking of the concrete under the anchor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the oblique bidirectional prestressed cement concrete prefabricated slab structure of the utility model;

[0014] Figure 2 It is a bottom view of the oblique bidirectional prestressed cement concrete prefabricated panel structure of the utility model;

[0015] Figure 3 It is a left view of the oblique bidirectional prestressed cement concrete prefabricated slab structure of the utility model;

[0016] Figure 4 This is a front view of the special-shaped anchor pad in the utility model;

[0017] Figure 5 It is a top view of the special-shaped anchor pad in the utility model.

[0018] In the figure: 1 longitudinal prestressed tendons, 2 transverse prestressed tendons, 3 longitudinal anti-cracking tendons, 4 transverse anti-cracking tendons, 5 special-shaped anchor pads, 6 spiral tendons in anchors, 7 notches, 8 anchors, 9 concrete, 10 stirrups, 11 bottom plates, 12 long vertical plates, 13 short vertical plates, 14 upper flat plates, 15 lower flat plates, 16 round holes, 17 anchoring tendons. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 , Figure 2 and Figure 3As shown, the front view, top view and left view of the oblique bidirectional prestressed cement concrete precast panel structure of the utility model are respectively given. The bidirectional prestressed cement concrete precast panel structure shown is composed of concrete 9 and longitudinal prestressed tendons 1, transverse prestressed tendons 2, longitudinal anti-cracking tendons 3, transverse anti-cracking tendons 4, special-shaped anchor pads 5 and anchor internal spiral tendons 6 cast in the concrete 9. The cement concrete precast panel shown is a non-rectangular parallelogram. This oblique cement concrete precast panel is required at the connection between the front wall of the bridge and the road. The directions of the longitudinal prestressed tendons 1 and transverse prestressed tendons 2 are respectively parallel to the longitudinal side and transverse side of the precast panel. Multiple longitudinal prestressed tendons 1 are arranged at equal transverse intervals, and multiple transverse prestressed tendons 2 are arranged at equal longitudinal intervals. Special-shaped anchor pads 5 are arranged on the inner sides of the four sides of the precast panel, and the special-shaped anchor pads 5 are cast in concrete 9. Both ends of the longitudinal prestressed tendons 1 and the transverse prestressed tendons 2 are anchored on the special-shaped anchor pads 5 through anchors 8; in this way, obliquely distributed longitudinal prestressed tendons 1 and transverse prestressed tendons 2 are formed in the precast panel.

[0021] During the production process of precast panels, the longitudinal prestressed tendons 1 and the transverse prestressed tendons 2 are tensioned by a tensioning device. After the precast panels are solidified, the tensioning is released and the panels are anchored by anchors 8. The tensioned longitudinal prestressed tendons 1 and the transverse prestressed tendons 2 are tensioned through the special-shaped anchor pads 5, so that the precast panels are in a compressive state both longitudinally and transversely. In this way, when the precast panels are laid and serve as road surfaces, the compressive stresses generated by the longitudinal prestressed tendons 1 and the transverse prestressed tendons 2 will offset the tensile stresses generated on the precast panels during vehicle driving, so that the bidirectional prestressed cement concrete precast panels are suitable for use as road panels.

[0022] The precast panel shown is provided with longitudinal anti-cracking ribs 3 and transverse anti-cracking ribs 4 near the edge positions around it, and the longitudinal anti-cracking ribs 3 and transverse anti-cracking ribs 4 are parallel to the longitudinal side and transverse side of the precast panel, respectively. There are multiple longitudinal anti-cracking ribs 3 and transverse anti-cracking ribs 4, which are tied together by stirrups 10 distributed at equal intervals. In this way, by providing multiple longitudinal anti-cracking ribs 3 and transverse anti-cracking ribs 4 at the edge positions of the precast panel, the strength at the edge positions of the precast panel is effectively increased, so that the edge positions of the precast panel will not crack during its service as a road panel, thereby avoiding the corrosion of the steel bars in the precast panel caused by water ingress, and effectively extending the life of the precast panel.

[0023] In order to prevent the special-shaped anchor pad 5 from being damaged due to excessive compressive stress generated by the tensioned special-shaped anchor pad 5 at the contact part with the concrete 9, an anchor inner spiral rib 6 is fixed on the inner side of the special-shaped anchor pad 5, and the anchor inner spiral rib 6 is located at the periphery of the ends of the longitudinal prestressed tendons 1 and the transverse prestressed tendons 2, that is, the ends of the longitudinal prestressed tendons 1 and the transverse prestressed tendons 2 pass through the anchor inner spiral rib 6. After the anchor inner spiral rib 6 is fixed on the inner side of the special-shaped anchor pad 5, not only the contact part of the special-shaped anchor pad 5 and the precast panel is subjected to force, but also the anchor inner spiral rib 6 and the concrete 9 in the precast panel are subjected to force concentration on the precast panel, and the firmness of the edge of the precast panel is further ensured, so that the precast panel is not easy to crack.

[0024] The longitudinal prestressed tendons 1 are arranged in double rows, and the transverse prestressed tendons 2 are arranged in a single row. The transverse prestressed tendons 2 are located below the central axis of the cement concrete precast slab. The longitudinal anti-cracking tendons 3 and transverse anti-cracking tendons 4 are composed of three rows and three columns, totaling 9 secondary steel bars, and are tied and fixed at equal intervals using stirrups 10. The spiral reinforcement 6 in the anchor is a spiral reinforcement with a spiral diameter of 6cm~8cm, a spiral spacing of 3cm~5cm, and a length of not less than 20cm. The strength grade of concrete 9 is 35MPa~45MPa.

[0025] like Figure 4 and Figure 5 As shown, the front view and top view of the special-shaped anchor pad in the utility model are respectively given. The special-shaped anchor pad 5 shown is composed of a bottom plate 11, a long vertical plate 12, a short vertical plate 13, an upper flat plate 14 and a lower flat plate 15. The bottom plate 11 is vertically arranged in the prefabricated plate. The long vertical plate 12 and the short vertical plate 13 are welded at the left and right edge positions of the outer side surface of the bottom plate 11, and the long vertical plate 12 is perpendicular to the bottom plate 11. The angle between the short vertical plate 13 and the bottom plate 11 is an obtuse angle, and the angle between the short vertical plate 13 and the bottom plate 11 is equal to the obtuse angle of the prefabricated plate. The upper flat plate 14 and the lower flat plate 15 are respectively welded at the upper and lower edge positions of the outer side surface of the bottom plate 11. The two opposite angles of the upper flat plate 14 and the lower flat plate 15 are right angles, and the remaining two angles are an obtuse angle and an acute angle. The acute angle and the obtuse angle on the upper flat plate 14 and the lower flat plate 15 are equal to the acute angle and the obtuse angle of the prefabricated plate.

[0026] In this way, a notch 7 is formed between the bottom plate 11, the long vertical plate 12, the short vertical plate 13, the upper flat plate 14 and the lower flat plate 15. The special-shaped anchor plate 5 with the notch 7 not only has the function of an anchor plate, but also has the function of a template, and the anchor 8 is located in the notch 7. A circular hole 16 is opened at the central position of the bottom plate 11, and the ends of the longitudinal prestressed tendons 1 and the transverse prestressed tendons 2 pass through the circular hole 16. Four anchoring bars 17 are fixed on the inner side surface of the bottom plate 11, and the ends of the anchoring bars 17 are hook-shaped. In this way, after the anchoring bars 17 are cast and anchored in the concrete 9, the firmness of the special-shaped anchor plate 5 fixed in the concrete 9 is further increased. The bottom plate 11 is square, the thickness of the bottom plate 11 is not less than 1 cm, the side length is not less than 8 cm, and the hole diameter of the circular hole 16 is 1.6 cm.

Claims

1. An oblique bidirectional prestressed cement concrete precast panel structure, comprising concrete (9) and longitudinal prestressed tendons (1), transverse prestressed tendons (2) and a special-shaped anchor pad (5) cast in the concrete, wherein the longitudinal prestressed tendons and the transverse prestressed tendons are arranged at equal intervals and parallel to the longitudinal edges and transverse edges of the cement concrete precast panel, respectively, the special-shaped anchor pad is fixed in the concrete on the inner sides of the four side surfaces of the cement concrete precast panel, and both ends of the longitudinal prestressed tendons and the transverse prestressed tendons are anchored to the special-shaped anchor pad via anchors (8); characterized in that: A plurality of longitudinal anti-cracking tendons (3) and transverse anti-cracking tendons (4) are arranged near the edges of the cement concrete precast slab, and the plurality of longitudinal anti-cracking tendons and transverse anti-cracking tendons are tied and fixed by stirrups arranged at equal intervals; an inner side surface of the special-shaped anchor pad is fixed with an anchor inner spiral tendon (6) through which the ends of the longitudinal prestressed tendons and the transverse prestressed tendons pass.

2. The oblique bidirectional prestressed cement concrete precast panel structure according to claim 1 is characterized in that: The longitudinal prestressed tendons (1) are arranged in double rows at equal transverse intervals, and the transverse prestressed tendons (2) are arranged in a single row at equal longitudinal intervals. The transverse prestressed tendons are located below the central axis of the cement concrete precast slab. The longitudinal anti-cracking tendons (3) and transverse anti-cracking tendons (4) are both composed of three rows and three columns, a total of 9 secondary steel bars.

3. The oblique bidirectional prestressed cement concrete precast panel structure according to claim 1 or 2, characterized in that: The spiral reinforcement (6) in the anchor is a spiral reinforcement with a spiral diameter of 6 cm to 8 cm, a spiral pitch of 3 cm to 5 cm, and a length of not less than 20 cm.

4. The oblique bidirectional prestressed cement concrete precast panel structure according to claim 1 or 2, characterized in that: The special-shaped anchor pad (5) is composed of a bottom plate (11), a long vertical plate (12), a short vertical plate (13), an upper flat plate (14) and a lower flat plate (15). The bottom plate is arranged vertically, and the long vertical plate and the short vertical plate are welded to the left and right edge positions of the outer side surface of the bottom plate. The long vertical plate is perpendicular to the bottom plate, and the angle between the short vertical plate and the bottom plate is an obtuse angle. The upper flat plate and the lower flat plate are vertically welded to the upper and lower edge positions of the outer side surface of the bottom. The angle between the short vertical plate and the bottom plate is equal to the obtuse angle of the cement concrete precast plate. Two opposite angles of the upper flat plate and the lower flat plate are right angles, and the other two opposite angles are acute angles and obtuse angles. The obtuse angle and acute angle of the upper flat plate and the lower flat plate are respectively equal to the acute angle and obtuse angle of the cement concrete precast plate. The middle edge of the bottom plate is provided with a circular hole (16) through which the end of the longitudinal prestressed tendon (1) or the transverse prestressed tendon (2) passes.

5. The oblique bidirectional prestressed cement concrete precast panel structure according to claim 4 is characterized in that: The bottom plate (11) is square, has a thickness of not less than 1 cm, a side length of not less than 8 cm, and a diameter of the circular hole (16) of 1.6 cm; the embedded position of the bottom plate (11) on the special-shaped anchor pad (5) is perpendicular to the longitudinal prestressed tendons (1) or the transverse prestressed tendons (2).

6. The oblique bidirectional prestressed cement concrete precast panel structure according to claim 4 is characterized in that: Four anchoring bars (17) with hooks at their ends are fixed on the inner side surface of the upper base plate (11) of the special-shaped anchor pad (5).

7. The oblique bidirectional prestressed cement concrete precast panel structure according to claim 1 or 2, characterized in that: The strength grade of the concrete (9) is 35 MPa-45 MPa.

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