Prestressed square pile hoop and manufacturing method thereof

Abstract

The present invention discloses a prestressed square pile hoop and a manufacturing method, and relates to the technical field of prestressed concrete pile manufacturing. The square pile hoop comprises a hoop body and an angle steel, the hoop body is bent into a closed ring shape, the angle steel is arranged at the connection of the steel plate of the hoop body, and the hoop body is also provided with a groove and an air outlet. The manufacturing steps include: firstly, bending the body of the prestressed square pile hoop into a closed rectangular ring structure, and three right-angle bending positions are arc-shaped; secondly, bending two grooves on two long sides respectively, and the right-angle bending positions of the grooves are also arc-shaped; then welding and fixing the grooves and the prestressed tendons of the prestressed square pile; finally, arranging the angle steel at the joint position of the pile hoop to fix the head and tail ends of the pile hoop body; the prestressed square pile hoop manufactured by this method can increase the stability of the pile body structure and the closure integrity of the pile hoop, and can also save materials and costs.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed concrete pile manufacturing, in particular to a prestressed square pile sleeve and a manufacturing method thereof. Background Art

[0002] There are many methods for making prestressed square piles. When making the pile body, stirrups are made first, then the prestressed main bars are inserted, and finally the stirrups and the prestressed main bars are tied together. This is not only troublesome and inefficient, but also difficult to ensure that the stirrups and the prestressed main bars fit together. In addition, since the steel cage adopts the binding process, according to the design requirements, the diameter of the prestressed main bars of the steel cage must be more than 20% larger than the diameter of the prestressed main bars of the steel cage using the welding process. The amount of prestressed main bars of the steel cage is large and the consumables are large, which greatly increases the manufacturing cost.

[0003] Usually, the cross section of a prestressed square pile is generally 400mm×400mm. A pile collar is set at the end of the pile body. The pile collar height is 360mm, the width is 400mm, and the thickness is 6mm. The pile collar of the corresponding square pile is rectangular ring-shaped, and the cross section of the pile collar is rectangular. The four end angles of the pile collar are 90o. Two 40×130×35mm pads are set in the two symmetrical directions of the inner side of the pile collar. The pads are connected to the prestressed tendons of the prestressed square pile. An angle steel (L63×6-340) is set at one end angle at the intersection of the pile collar steel plate. Only a φ40 air outlet is set on the pile collar on the side where concrete is poured. The pile collar made by this method has insufficient structural stability, and its closure is not good and it is easy to leak. In order to avoid using the method of pre-embedded pads to make pile collars, the purpose of saving costs and increasing the reliability and stability of the overall structure of the prestressed square pile is achieved by improving the method of making pile collars for prestressed square piles. Summary of the invention

[0004] In order to increase the stability of the pile body structure and the closure integrity of the pile sleeve, avoid using a pre-embedded pad to make the pile sleeve, no longer need to connect the pre-embedded pad with the prestressed tendons, and achieve the purpose of saving materials and costs, the present invention provides a prestressed square pile sleeve and a method for making it, and the specific technical solution is as follows.

[0005] A prestressed square pile hoop comprises a hoop body and an angle steel. The hoop body is bent into a closed ring shape. The angle steel is arranged at the connection of the hoop body steel plate. The hoop body is also provided with a groove and an air outlet.

[0006] Preferably, rubber plugs are respectively provided at the groove positions.

[0007] Also preferably, the groove is located on the inner side surrounded by the hoop body and is connected to a square pile prestressed reinforcement.

[0008] A method for manufacturing a prestressed square pile hoop, the manufacturing steps comprising:

[0009] Step 1. Bend the body of the prestressed square pile hoop into a closed rectangular ring structure;

[0010] Step 2. Bend two grooves on the two long sides of the rectangular ring structure respectively;

[0011] Step 3. Weld the prestressed tendons of the fixed grooves and prestressed square piles;

[0012] Step 4. Set angle steel at the joint position of the pile sleeve to fix the head and tail ends of the pile sleeve body.

[0013] Furthermore, the pile sleeve body is bent into a closed rectangular ring structure through three right-angle bends, and the right-angle bends are in an arc shape.

[0014] Furthermore, the groove is formed into an open groove by four right-angle bends, and the positions of the right-angle bends are arc-shaped.

[0015] Furthermore, the pile collar is fixed to the end of the prestressed square pile body.

[0016] Furthermore, the right-angle bend is an arc bend with a radius of R6mm, and the four grooves on the pile sleeve are symmetrically arranged.

[0017] Still further, the angle steel is welded and fixed to the outside of the fixed pile hoop body.

[0018] Furthermore, the welding positions of the connection points of the angle steel and the connection points of the prestressed tendons are square and straight, and the welds are full.

[0019] The beneficial effects of the present invention are that a method for manufacturing a pile sleeve of a prestressed square pile is provided, and the pile sleeve body is directly connected to the prestressed tendons of the prestressed square pile by directly bending the pile sleeve body into a predetermined closed ring structure, thereby better increasing the stability of the pile body structure; two grooves are provided to facilitate the connection between the prestressed tendons and the pile sleeve, and the closed integrity of the pile sleeve can be ensured to prevent leakage of slurry; in addition, by providing arc bending, angle steel connection, and correct welding, the purpose of saving materials and costs is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the design of the pile hoop of the prestressed square pile;

[0021] Figure 2 It is a design diagram of prestressed tendons and square pile hoops.

[0022] Figure 3 It is a schematic diagram of the construction design of the prestressed square pile hoop in Example 2;

[0023] Figure 4 yes Figure 3 Side view of

[0024] Figure 5 It is the design diagram of the upper steel plate;

[0025] Figure 6 yes Figure 5 Side view of

[0026] Figure 7 This is the design diagram of the left steel plate;

[0027] Figure 8 yes Figure 7 Side view of

[0028] Fig. 9 It is the relationship diagram between the prestressed square pile sleeve and the prestressed tendon structure.

[0029] In the figure: 1-pile sleeve body; 11-upper steel plate; 12-lower steel plate; 13-left steel plate; 14-right steel plate; 2-prestressed tendons; 3-grooves; 4-angle steel; 5-rubber plug; 6-air holes. DETAILED DESCRIPTION

[0030] Combination Figures 1 to 9 As shown, the specific implementation methods of a prestressed square pile hoop and a manufacturing method provided by the present invention are as follows.

[0031] Example 1

[0032] A prestressed square pile hoop specifically includes a hoop body and an angle steel, wherein the hoop body is bent into a closed ring shape, and the prestressed square pile hoop is arranged at the end of the square pile body. The angle steel is arranged at the connection of the hoop body steel plate, and the hoop body is also provided with a groove and an air outlet, wherein the air outlet is only arranged on one side of the poured concrete, so as to ensure the exhaust of gas and complete grouting, and two grooves can be respectively arranged on the two adjacent sides where the air outlet is arranged. Rubber plugs are respectively arranged at the groove positions to prevent grout leakage, and the arrangement of the groove avoids the use of a pre-embedded pad to make the pile hoop, and it is no longer necessary to connect the pre-embedded pad with the prestressed tendon. The position of the groove is connected to the square pile prestressed tendon on the inner side surrounded by the hoop body, and the prestressed tendon and the hoop body are fixed by welding. The hoop body is an integral steel plate, and the shape of the steel plate is changed during production to form a closure and a groove.

[0033] A method for manufacturing a prestressed square pile hoop, the manufacturing steps comprising:

[0034] Step 1. Bend the main body of the prestressed square pile hoop into a closed rectangular ring structure. The pile hoop body is bent into a closed rectangular ring structure through three right angles, and the right angle bending position is arc-shaped. The pile hoop body is a plate with a certain thickness and is bendable. The plate is closed into a ring structure through three right angle bends, and the ends are fixed together at the closed position; by directly bending the pile hoop body into a predetermined closed ring structure, it is directly connected to the prestressed tendons of the prestressed square pile, thereby better increasing the stability of the pile body structure.

[0035] Step 2. Bend two grooves on the two long sides of the rectangular ring structure respectively. After bending the two grooves, the overall length of the long side is equal to the short side, so as to form a square that fits the square pile hoop; the groove is made into an open groove by four right-angle bends, and the right-angle bend position is arc-shaped. In the prestressed square pile, the shape of the groove can be square, or set to other shapes such as arc, equilateral polygon, etc. according to needs.

[0036] Step 3. Weld the fixed grooves and the prestressed tendons of the prestressed square piles. Set two grooves to facilitate the connection between the prestressed tendons and the pile sleeves, and ensure the closure integrity of the pile sleeves to prevent leakage.

[0037] Step 4. Angle steel is set at the joint position of the pile hoop to fix the first and last ends of the pile hoop body. The angle steel is welded and fixed to the outside of the fixed pile hoop body.

[0038] The right-angle bend is an arc bend with a radius of R6mm. The bend with this radius performs well in actual use. The four grooves on the pile collar are arranged symmetrically to ensure the stability of the structure as a whole. The welding positions of the angle steel connection and the prestressed tendon connection are square and straight, and the welds are full. The pile collar is fixed to the end of the prestressed square pile body and is used for the production of prestressed square piles.

[0039] The method for manufacturing the pile hoop of the prestressed square pile directly bends the pile hoop body into a predetermined closed ring structure, and directly connects it with the prestressed tendons of the prestressed square pile, thereby better increasing the stability of the pile body structure; two grooves are provided to facilitate the connection between the prestressed tendons and the pile hoop, and the closed integrity of the pile hoop can be ensured to prevent leakage of slurry; in addition, the purpose of saving materials and costs is achieved by providing arc bending, angle steel connection, and correct welding.

[0040] In addition, to further illustrate the method, a specific design is also disclosed. The cross-section of the prestressed square pile is 400mm×400mm. A pile hoop is set at the end of the pile body. The pile hoop has a height of 360mm, a width of 400mm, and a thickness of 6mm. The pile hoop body is an irregular ring structure, specifically, an approximately rectangular outline with 4 grooves. The four end corners of the pile hoop are bent into an integral body with an arc of R6mm radius. When the pile hoop is made, the steel plate is symmetrically bent at a distance of 70.5mm along the end corners on two symmetrical sides to form two grooves of 36×35mm, ensuring that the pile hoop is a complete ring structure, and the groove is connected to the prestressed tendons of the prestressed square pile. There is an angle steel (size L63×6-340) at the intersection of the pile sleeve steel plate. The pile sleeve can increase the stability of the pile body structure and the closure integrity of the pile sleeve; and it breaks through the traditional practice of connecting the embedded pad with the prestressed tendons, saving materials, saving costs, and increasing the reliability and stability of the overall structure of the prestressed square pile.

[0041] Example 2

[0042] This embodiment provides another specific embodiment, specifically, the sleeve body adopts a split structure, and the specific structure of the sleeve for a prestressed square pile includes a rubber plug 5, an upper steel plate 11, a lower steel plate 12, a left steel plate 13 and a right steel plate 14. The upper steel plate 11, the lower steel plate 12, the left steel plate 13 and the right steel plate 14 form an outer contour adapted to the prestressed square pile and have 4 grooves, and rubber plugs are arranged in the grooves. Among them, the upper steel plate 11 and the lower steel plate 12 are symmetrical, and the left steel plate 13 and the right steel plate 14 are symmetrical, and their shapes and sizes are exactly the same, and they can be interchanged and swapped, which is convenient for production. The upper steel plate 11, the lower steel plate 12, the left steel plate 13 and the right steel plate 14 are connected end to end to form a closed ring, and four rubber plugs are provided at the positions where the upper steel plate 11, the lower steel plate 12, the left steel plate 13 and the right steel plate 14 are connected, and two right-angle bends are provided at both ends of the upper steel plate 11, the lower steel plate 12, the left steel plate 13 and the right steel plate 14. The prestressed square pile hoop is set to a shape corresponding to the prestressed square pile and is provided with a rubber plug, so as to avoid the problem of slurry leakage. The pile hoop is surrounded by the upper steel plate, the lower steel plate, the left steel plate and the right steel plate, and it is no longer necessary to embed a pad to connect with the prestressed square pile prestressed tendons, thereby saving materials and costs.

[0043] The right-angled bending positions at both ends of the upper steel plate 11, the lower steel plate 12, the left steel plate 13 and the right steel plate 14 are arc-shaped, thereby increasing the reliability and stability of the overall structure of the prestressed square pile. The upper steel plate 11 or the lower steel plate 12 is an integral structure in a "U" shape and has an inward folding part. That is to say, both the upper steel plate 11 and the lower steel plate 12 are made by bending a single steel plate. The shape of the upper steel plate 11 or the lower steel plate 12 is also similar to a U shape and has an inner folding part at both ends. This inner folding part is also the inner flange, and the final shape is similar to that with an opening in the middle of the lower side of a rectangle. The left steel plate 13 or the right steel plate 14 is an integral structure in a "U" shape and has an outward folding part. The left steel plate and the right steel plate are also made by bending a single steel plate. The prestressed square pile sleeve hoop is arranged at the end of the square pile body and is used for the production of prestressed square piles. When in use, the prestressed square pile sleeve hoop does not need to weld the embedded backing plate and the prestressed square pile prestressing tendons together with angle steel like the traditional square pile sleeve hoop.

[0044] A method for manufacturing a prestressed square pile sleeve hoop, which is used for manufacturing the above-mentioned prestressed square pile sleeve hoop, and the steps include:

[0045] A. Manufacture the upper steel plate and the lower steel plate. The two ends of the horizontal section of the upper steel plate or the lower steel plate are vertically bent to the same side respectively, and the right-angled bending position is an arc with a radius of R6mm, and then it is folded along the inner horizontal direction with the same arc.

[0046] B. Manufacture the left steel plate and the right steel plate. The two ends of the horizontal section of the left steel plate or the right steel plate are vertically bent to the same side respectively, and the right-angled bending position is an arc with a radius of R6mm, and then it is folded along the outer horizontal direction with the same arc.

[0047] Among them, the order of steps A and B can be reversed or steps A and B can be carried out simultaneously.

[0048] C. Weld the upper steel plate, the lower steel plate, the left steel plate and the right steel plate to form a closed ring with four grooves. When welding, it is necessary to ensure that the welding positions between the upper steel plate, the lower steel plate, the left steel plate and the right steel plate are square, straight, and the welds are full.

[0049] In step A, the length of the horizontal section of the upper steel plate or the lower steel plate is 400mm, the length of the vertical bending to the same side is 82.5mm, and the length of the folding along the inner horizontal direction is 36mm; in step B, the length of the horizontal section of the left steel plate and the right steel plate is 165mm, the length of the vertical bending to the same side is 36mm, and the length of the folding along the outer horizontal direction is 35mm.

[0050] For better explanation, a specific implementation method is provided. In this embodiment, the cross section of the prestressed square pile is 400mm×400mm. A prestressed square pile hoop is set at the end of the pile body. The pile hoop has a height of 360mm, a width of 400mm, and a thickness of 6mm. The pile hoop body is a complete irregular ring structure. The four end corners of the pile hoop are bent with a radius of R6mm. The two symmetrical sides have two 36×35mm grooves at a distance of 82.5mm along the end corners of the steel plate. Rubber plugs are added to the four grooves to prevent leakage.

[0051] The prestressed square pile hoop is divided into four steel plates during production (the upper and lower steel plates are symmetrical in size and shape; the left and right steel plates are symmetrical in size and shape), and finally the four steel plates are welded together. ① Upper and lower steel plates: The horizontal length of the steel plate is 400mm, and the left and right sides of the inner R6mm radius arc are bent vertically in the same direction by 82.5mm each, and then bent horizontally inward by 36mm each along the inner R6mm radius arc. ② Left and right steel plates: The horizontal length of the steel plate is 165mm, and the left and right sides of the inner R6mm radius arc are bent vertically in the same direction by 36mm each, and then bent horizontally outward by 35mm each along the inner R6mm radius arc. The four pile hoop steel plates are welded, and the welding positions are respectively at one of the end corners of the four grooves of the pile hoop, at a right angle of 90°, to ensure that the pile hoop is a complete annular structure. The welding at the intersection of the pile sleeve and the hoop should be straight and square. No tilt, corner or warping is allowed. The weld must be full to increase the stability of the pile body structure and the closure integrity of the pile sleeve and the hoop.

[0052] The manufacturing method of the prestressed square pile hoop is more flexible, which saves manufacturing materials and manufacturing costs.

[0053] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A prestressed square pile hoop, characterized in that: It includes a hoop body and an angle steel, the hoop body is bent into a closed ring, the angle steel is arranged at the connection of the hoop body steel plate, and the hoop body is also provided with a groove and an air outlet; The grooves are respectively provided with rubber plugs; The groove is located at an inner side surrounded by the sleeve body and is connected with a square pile prestressed reinforcement.

2. A method for manufacturing a prestressed square pile hoop, manufacturing a prestressed square pile hoop according to claim 1, characterized in that: The steps include, Step 1. Bend the body of the prestressed square pile hoop into a closed rectangular ring structure; Step 2. Bend two grooves on the two long sides of the rectangular ring structure respectively; Step 3. Weld the prestressed tendons of the fixed grooves and prestressed square piles; Step 4. Set angle steel at the joint position of the pile sleeve to fix the head and tail ends of the pile sleeve body.

3. The method for manufacturing a prestressed square pile hoop according to claim 2, characterized in that: The pile sleeve body is bent at three right angles to form a closed rectangular ring structure, and the right-angle bending positions are arc-shaped.

4. The method for manufacturing a prestressed square pile hoop according to claim 2, characterized in that: The groove is formed into an open groove by four right-angle bends, and the right-angle bends are in arc shape.

5. A method for manufacturing a prestressed square pile hoop according to claim 3 or 4, characterized in that: The pile sleeve is fixed on the end of the prestressed square pile body.

6. A method for manufacturing a prestressed square pile hoop according to claim 5, characterized in that: The right-angle bend is an arc bend with a radius of R6mm, and the four grooves on the pile hoop are symmetrically arranged.

7. The method for manufacturing a prestressed square pile hoop according to claim 5, characterized in that: The angle steel is welded and fixed on the outer side of the fixed pile hoop body.

8. The method for manufacturing a prestressed square pile hoop according to claim 5, characterized in that: The welding positions of the connection points of the angle steel and the connection points of the prestressed tendons are square and straight, and the welds are full.

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