Centrifugally formed concrete u-shaped sheet pile and forming mold thereof

Abstract

The application discloses centrifugal forming concrete U-shaped sheet pile, including center along the axial forming semicircular cavity's sheet pile body, the sheet pile body is by concrete and U-shaped reinforcement cage adopts centrifugal method prefabricated forming, the cross section of sheet pile body is U-shaped structure, the sheet pile body's surrounding face is a plane, the side of two connecting arms of sheet pile body is an inclined plane, the inner angle between inclined plane and surrounding face is greater than 95 degrees, the end of two connecting arms is formed with the concave-convex clamping structure for making two sections of sheet pile transverse splicing forms the pile wall, its forming die includes upper die and lower die, the upper die and lower die are two same units U-shaped plate mould, the unit U-shaped plate mould all has the combined type cavity of forming 3 / 4 part of one section of U-shaped sheet pile and 1 / 4 part of another section of U-shaped sheet pile, two unit U-shaped plate moulds are closed after two combined type cavities cooperate and form U-shaped sheet pile cavity that can centrifugal forming two sections of U-shaped sheet pile once.

Description

Technical Field

[0001] The invention relates to the technical field of precast concrete piles, in particular to a centrifugally formed concrete U-shaped sheet pile and a forming mould thereof. Background Art

[0002] Concrete sheet piles are precast concrete components that replace steel sheet piles. They are widely used in underwater cap cofferdams, silt and sand infiltration prevention projects, various deep foundation retaining systems, underground garage support projects, pump station cofferdams, large pipeline support, high-speed railway pier support, embankment reconstruction cofferdams, foundation pit retaining systems, and other related projects. Traditional concrete sheet piles are often produced using a vibrating molding method, which is inefficient, has low concrete density, and is relatively insecure and unstable. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a centrifugally formed concrete U-shaped sheet pile and its forming mold with high density, good bending resistance, low production cost and suitable for mass production in response to the current status of the above-mentioned existing technology.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A centrifugally formed concrete U-shaped sheet pile comprises a sheet pile body with a semicircular cavity formed axially in the center. The sheet pile body is prefabricated by a centrifugal method from concrete and a U-shaped steel cage. The cross section of the sheet pile body is a U-shaped structure. The retaining surface of the sheet pile body is a plane. The side surfaces of the two connecting arms of the sheet pile body are inclined surfaces. The internal angle between the inclined surface and the retaining surface is greater than 95 degrees. The ends of the two connecting arms are formed with concave and convex retaining structures for horizontally splicing two sections of sheet piles to form a pile wall. The concave and convex retaining structures extend along the entire length of the sheet pile body.

[0006] To optimize the above technical solutions, specific measures taken also include:

[0007] The above-mentioned concave-convex locking structure consists of a locking protrusion and a locking groove that can lock the locking protrusion; the locking protrusion is formed on the inner half of the end of the connecting arm, and the locking groove is formed on the outer half of the end of the connecting arm; when two sections of sheet piles are spliced ​​horizontally, the locking protrusion of one section of sheet pile is locked into the locking groove of the other section of sheet pile.

[0008] The above-mentioned locking protrusion is located in the locking groove and has a semicircular water stop groove formed on its side surface. The water stop grooves of the two sections of sheet piles can be combined into a circular grouting water stop hole for injecting water-blocking material when the piles are horizontally spliced; or, the locking protrusion is located in the locking groove and has a steel groove connecting key embedded on its side surface. The steel groove connecting keys of the two sections of sheet piles cooperate with each other to prevent them from being unhooked when the piles are horizontally spliced.

[0009] The pile end plate is arranged at the two ends of the pile body.

[0010] The U-shaped reinforcement cage is composed of a plurality of longitudinal main reinforcements arranged in a U shape and a plurality of auxiliary reinforcements arranged at equal intervals in the length direction of the longitudinal main reinforcements; the auxiliary reinforcements are fixedly connected to the longitudinal main reinforcements in a welded or tied manner to form an integral body; the two ends of the auxiliary reinforcements are formed with anti-unhooking hooks; and the anti-unhooking hooks are hooked and positioned with the longitudinal main reinforcement arranged at the upper end of the U-shaped opening.

[0011] The application also provides a forming mold for centrifugal forming of the U-shaped concrete sheet pile, which comprises a matched upper mold and lower mold; the upper mold and the lower mold are two unit U-shaped plate molds which are completely identical in structure; each unit U-shaped plate mold has a combined cavity for forming 3 / 4 of one U-shaped sheet pile and 1 / 4 of another U-shaped sheet pile; after the two unit U-shaped plate molds are closed, the two combined cavities cooperatively form a U-shaped sheet pile cavity for centrifugal forming of two U-shaped sheet piles at one time.

[0012] The unit U-shaped plate mold is composed of two cavity plates, a plurality of support plates and a plurality of semicircular unit running wheel rings; the two cavity plates are welded to form an integral body to form the combined cavity; and a partition plate for separating the two U-shaped sheet piles is installed on the cavity plate with the inclined surface for forming the connecting arm of the U-shaped sheet pile; the plurality of support plates are welded on the outer surfaces of the two cavity plates with equal curvature; and the plurality of unit running wheel rings are welded on the outer ends of the support plates at equal intervals in the length direction; after the unit running wheel rings of the two unit U-shaped plate molds are closed, a complete circular running wheel is formed; the partition plate is composed of a clamping groove partition plate for simultaneously forming the clamping grooves of the two U-shaped sheet piles and a connecting arm partition plate connected at the center of the clamping groove partition plate for separating the connecting arms of the two U-shaped sheet piles; a plurality of partition plate connectors are arranged at equal intervals in the length direction of the partition plate (9) between the partition plates on the two unit U-shaped plate molds.

[0013] The clamping groove partition plate is provided with an arc-shaped protrusion for forming a water stop groove; or the clamping groove partition plate is provided with a receiving groove matched with the shape of the steel groove connecting key.

[0014] The two cavity plates include a rectangular flat cavity plate and a beveled cavity plate with two symmetrical bevels with an inclination angle greater than 5 degrees; after the bevel and the flat cavity plate are welded, the included angle between the bevel and the flat cavity plate is greater than 95 degrees.

[0015] The two cavity plates are both rectangular flat cavity plates, and one of the two flat cavity plates is symmetrically welded with a modified plate for forming a connecting arm bevel; the modified plate is a right-angled triangular steel plate with an acute angle greater than 5 degrees.

[0016] Compared with the prior art, the sheet pile of the present application is a U-shaped sheet pile prefabricated by concrete and U-shaped reinforcement cage by centrifugal method. The U-shaped sheet pile formed by centrifugal method has the advantages of high density, good bending resistance and low production cost. The present application further forms a concave-convex clamping structure at the end of the two connecting arms of the sheet pile body, and the two U-shaped sheet piles can be conveniently spliced in the transverse direction through the concave-convex clamping structure, thereby forming a pile wall for enclosure. The present application further discloses a forming mold for the U-shaped sheet pile, which is composed of two unit U-shaped sheet molds with the same structure. The two unit U-shaped sheet molds cooperate to form the upper mold and the lower mold of the mold. Each unit U-shaped sheet mold has a combined cavity for forming 3 / 4 of one U-shaped sheet pile and 1 / 4 of another U-shaped sheet pile. After the two unit U-shaped sheet molds are closed, the two combined cavities cooperate to form a U-shaped sheet pile cavity for centrifugally forming two U-shaped sheet piles at one time. The mold of the present application has high production efficiency, good safety and stability, and is suitable for large-scale batch production. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the sectional structure of the U-shaped sheet pile in the present application;

[0018] Figure 2 is Figure 1 a sectional structure of the U-shaped sheet pile in the present application;

[0019] Figure 3 is Figure 1 a plan view of the U-shaped sheet pile in the present application spliced in the transverse direction to form a pile wall;

[0020] Figure 4 is a schematic diagram of the sectional structure of the U-shaped sheet pile in the present application;

[0021] Figure 5 is Figure 4 a plan view of the U-shaped sheet pile in the present application spliced in the transverse direction to form a pile wall;

[0022] Figure 6 is a schematic diagram of the sectional structure of the U-shaped sheet pile mold in the present application;

[0023] Figure 7 is Figure 6 a schematic diagram of the sectional structure of the unit U-shaped sheet mold constituting the upper mold or the lower mold in the present application;

[0024] Figure 8 is a schematic diagram of the sectional structure of the U-shaped sheet pile mold in the present application;

[0025] Figure 9 is Figure 8 a schematic diagram of the structure of the mold with a partition plate;

[0026] Figure 10 is Figure 8The schematic diagram of the sectional structure of the unit U-shaped sheet pile mold constituting the upper mold or the lower mold;

[0027] Figure 11 The schematic diagram of the sectional structure of the mold and the formed U-shaped sheet pile of the present application;

[0028] Figure 12 The schematic diagram of the structure of the partition sheet of the present application;

[0029] Figure 13 The schematic diagram of the three-dimensional structure of the connection of the partition sheet and the partition sheet connector of the present application;

[0030] Figure 14 The schematic diagram of the sectional structure of the connection of the partition sheet and the partition sheet connector of the present application;

[0031] Figure 15 The schematic diagram of the sectional structure of the other five kinds of partition sheets of the present application. DETAILED DESCRIPTION

[0032] The embodiments of the present application are further described in detail below with reference to the accompanying drawings.

[0033] Figures 1 to 15 The schematic diagram of the structure of the U-shaped sheet pile and the forming mold of the present application.

[0034] The reference signs in the drawings are as follows: inner included angle α, grouting water stop hole K, upper mold M1, lower mold M2, sheet pile body 1, semicircular cavity 1a, enclosing surface 11, connecting arm 12, inclined surface 121, concrete 2, U-shaped reinforcement cage 3, longitudinal main reinforcement 31, auxiliary reinforcement 32, anti-unhooking device 321, concave-convex clamping structure 4, water stop groove 4a, clamping protrusion 41, clamping recess 42, unit U-shaped sheet pile mold 5, combined cavity 5a, cavity plate 6, flat cavity plate 61, inclined cavity plate 62, inclined angle inclined surface 621, modified plate 63, support plate 7, running wheel 8, unit running wheel ring 81, partition sheet 9, clamping groove partition sheet 91, arc-shaped protrusion 91a, connecting arm partition sheet 92, partition sheet connector 93.

[0035] As shown in Figure 1 and Figure 5 The present application discloses a centrifugally formed concrete U-shaped sheet pile, which comprises a sheet pile body 1 having a semicircular cavity 1a formed in the center along the axial direction, the sheet pile body 1 being composed of concrete 2 and a U-shaped reinforcement cage 3 embedded in the concrete 2, and the sheet pile body 1 being prefabricated and formed by using a centrifugal mold through a centrifugal method. The sheet pile body 1 formed by using the centrifugal method has the advantages of high density, good bending resistance, and low production cost. The length of the sheet pile body 1 can be designed according to the height required for the enclosure of the sheet wall, and the cross section of the sheet pile body 1 is Figure 2The shown U-shaped structure. The enclosing surface 11 of the sheet pile body 1 is a rectangular plane, the U-shaped structure sheet pile body 1 has two connecting arms 12, the outer side of the connecting arm 12 is an inclined inclined surface 121, the inner angle α between the inclined surface 121 and the enclosing surface 11 is greater than 95 degrees, and the best is less than 102 degrees. The end of the two connecting arms 12 of the sheet pile body 1 is formed with a concave-convex clamping structure 4, and the concave-convex clamping structure 4 extends along the entire length of the sheet pile body 1. The concave-convex clamping structure 4 can easily splice two U-shaped sheet piles in the transverse direction, thereby forming a pile wall for enclosure.

[0036] From Figure 2 、 Figure 3 and Figure 5 It can be seen that the concave-convex clamping structure 4 of the present application is composed of a clamping convex block 41 and a clamping recess 42 capable of clamping the clamping convex block 41; the clamping convex block 41 is formed on the inner side of the end of the connecting arm 12, and the clamping recess 42 is formed on the outer side of the end of the connecting arm 12; when two U-shaped sheet piles are transversely spliced, the clamping convex block 41 of one sheet pile is clamped into the clamping recess 42 of the other sheet pile.

[0037] As Figure 1 、 Figure 2 and Figure 3 The clamping convex block 41 of the present application is formed with a semicircular water stop groove 4a on the side surface in the clamping recess 42, and the water stop grooves 4a of the two sheet piles can be combined into a circular grouting water stop hole K for injecting water-blocking material when the piles are transversely spliced. Of course, the water stop groove 4a can also be formed on the top surface of the clamping convex block 41 and the bottom surface of the clamping recess 42. When the top surface of the clamping convex block 41 and the bottom surface of the clamping recess 42 are both formed with the water stop groove 4a, the water stop groove 4a formed on the top surface of the clamping convex block 41 can cooperate with the water stop groove 4a formed on the bottom surface of the clamping recess 42 to form a circular grouting water stop hole K for injecting water-blocking material when the two piles are transversely spliced.

[0038] As Figure 4 and Figure 5As shown, the present application also provides another U-shaped sheet pile which is designed with a steel groove connecting key J in the clamping groove 42, and the steel groove connecting key J is pre-buried on the side of the clamping protrusion 41 located in the clamping groove 42. When two sections of piles are transversely spliced, the steel groove connecting keys J of the two sections of U-shaped sheet piles are prevented from unhooking and are hung in cooperation. The steel groove connecting key J of the present application is designed with a bent hook head body which forms a hook groove with the side of the clamping protrusion 41 located in the clamping groove 42. When two sections of piles are transversely spliced, the hook head body of one section of pile is hung into the hook groove of the other section of pile, so that the two sections of piles can form an integral whole. The pile wall formed by the connection of the steel groove connecting key J can bear a large thrust without the problem of falling off at a certain place, and the gap formed at the hooking connection of the two sections of piles can also be injected with water-blocking material.

[0039] The both ends of the sheet pile body 1 of the present application are provided with pile end plates made of steel plates, which can be welded and connected with the U-shaped reinforcement cage 3 in the U-shaped sheet pile to form an integral whole before the U-shaped sheet pile is prefabricated and formed. Of course, the both ends of the U-shaped sheet pile of the present application can also not be provided with pile end plates. The advantage of providing the pile end plates is that the pile end plates can prevent the pile end from being damaged and affecting the quality of the pile.

[0040] From Figure 2 It can be seen that the U-shaped reinforcement cage 3 of the present application is composed of a plurality of longitudinal main reinforcements 31 arranged in a U-shaped manner and a plurality of auxiliary reinforcements 32 arranged at equal intervals in the length direction of the longitudinal main reinforcements 31. The auxiliary reinforcements 32 are fixedly connected with the longitudinal main reinforcements 31 in a welded or tied manner to form an integral whole; the both ends of the auxiliary reinforcements 32 are formed with anti-unhooking hooks 321 which are hooked and positioned in cooperation with the longitudinal main reinforcement 31 arranged at the uppermost end of the U-shaped opening.

[0041] The forming mold of the centrifugal formed concrete U-shaped sheet pile of the present application comprises two unit U-shaped sheet molds 5 which are completely identical in structure and are matched to form an upper mold M1 and a lower mold M2 of the mold for forming the U-shaped sheet pile. Each unit U-shaped sheet mold 5 has a combined cavity 5a for forming 3 / 4 of one section of U-shaped sheet pile and 1 / 4 of another section of U-shaped sheet pile. After the two unit U-shaped sheet molds 5 are closed, the two combined cavities 5a are matched to form a U-shaped sheet pile cavity which can centrifugally form two sections of U-shaped sheet pile at a time. Each unit U-shaped sheet mold 5 of the present application can form 3 / 4 of one section of U-shaped sheet pile and 1 / 4 of another section of U-shaped sheet pile. Since the both sides of the U-shaped sheet pile of the present application are inclined surfaces 121, the design of such combined cavities 5a is more conducive to the demolding of the sheet pile after forming.

[0042] In the embodiment, the unit U-shaped plate formwork 5 of the present invention is composed of two cavity plates 6, multiple support plates 7 and multiple semicircular unit running wheel rings 81; the two cavity plates 6 are welded together to form the above-mentioned combined cavity 5a, and the cavity plate 6 used to form the inclined surface 121 of the U-shaped sheet pile connecting arm 12 is installed with a partition 9 (such as Figure 9 and Figure 11 As shown in the figure, multiple support plates 7 are welded to the outer surfaces of the two cavity plates 6 with equal arcs, and multiple unit running wheel rings 81 are welded to the outer ends of the support plates 7 at equal intervals in the longitudinal direction. After the unit running wheel rings 81 of the two unit U-shaped plate molds 5 are molded together, a complete annular running wheel 8 is formed. Each unit U-shaped plate mold 5 of the present invention has five support plates 7 welded to it, and one support plate 7 is welded to each of the two ends of the unit U-shaped plate mold 5 at the mold joint.

[0043] like Figure 12 、 Figure 13 and Figure 14 As shown, the separator 9 of the present invention comprises a slot separator 91, which forms the retaining grooves 42 of two sections of U-shaped sheet piles simultaneously, and a connecting arm separator 92, which is connected to the center of the connecting arm 12 of the slot separator 91 to separate the two sections of U-shaped sheet piles. Multiple separator connectors 93 are provided between the separators 9 on the two unit U-shaped sheet formworks 5 at equal intervals along the length of the separator 9. The separator 9 of the present invention can be used to separate any centrifugally formed concrete prefabricated products.

[0044] like Figure 12 As shown, the slot partition plate 91 of the present invention is provided with an arc-shaped protrusion 91a for forming the water-stop groove 4a. Figure 15 a, b, c, d, e in the figure show the design structure of five other partitions 9 of the present invention. The location of the arc-shaped protrusion 91a on the partition 9 can determine the location of the grouting water stop hole K formed after the piles are spliced. Figure 15 In d, the arc-shaped protrusion 91a is not provided.

[0045] When the U-shaped sheet pile of the present invention is provided with a steel groove connecting key J in the positioning groove 42, the partition plate 9 is as follows: Figure 12 As shown, the position of the arc-shaped protrusion 91a can be changed to a concave accommodating groove that can adapt to the shape of the steel slot connecting key J, that is, the slot partition plate 91 is provided with an accommodating groove that adapts to the shape of the steel slot connecting key J.

[0046] In the embodiment, Figure 6 and Figure 7As shown, the two cavity plates 6 are composed of one rectangular flat cavity plate 61 and one inclined cavity plate 62. The inclined cavity plate 62 is made by bending a rectangular steel plate. The two sides of the inclined cavity plate 62 are symmetrically bent to form an inclined surface 621 with an angle greater than 5 degrees and less than 12 degrees. After the inclined surface 621 is welded with the flat cavity plate 61, the included angle α between the inclined surface 621 and the flat cavity plate 61 is greater than 95 degrees and less than 102 degrees.

[0047] In the embodiment, as shown, the two cavity plates 6 of the present application can also be two flat cavity plates 61 with the same structure. The two flat cavity plates 61 are both rectangular steel plates, and the two flat cavity plates 61 are connected by welding at an angle of 90 degrees. One of the two flat cavity plates 61 is symmetrically welded with two modification plates 63 for forming the inclined surface 121 of the connecting arm 12. Figures 8 to 10

[0048] The present application is a method for forming a U-shaped plate pile by centrifugal molding. The method includes temporarily fixing and installing a U-shaped reinforcement cage 3 and a partition plate 9 in an upper mold M1 and a lower mold M2 of a centrifugal mold, separating two precast piles by the partition plate 9, and then pouring concrete 2 into the mold. After that, the mold is hoisted to a centrifugal machine to produce piles by centrifugal method. After centrifugation, the piles are subjected to processes such as static stopping, steam curing, and demolding, and finally the U-shaped plate piles are obtained.

[0049] The best embodiment of the present application has been described, and various changes or modifications made by those skilled in the art will not deviate from the scope of the present application.​

Claims

1. A forming mold for a centrifugally formed concrete U-shaped sheet pile, the centrifugally formed concrete U-shaped sheet pile comprising a sheet pile body (1) with a semicircular cavity (1a) formed in the center along the axial direction, the sheet pile body (1) being prefabricated by a centrifugal method from concrete (2) and a U-shaped steel cage (3); the cross section of the sheet pile body (1) being a U-shaped structure, the retaining surface (11) of the sheet pile body (1) being a plane, the side surfaces of the two connecting arms (12) of the sheet pile body (1) being an inclined surface (121), the inner angle (α) between the inclined surface (121) and the retaining surface (11) being greater than 95 degrees, the ends of the two connecting arms (12) being formed with a concave-convex positioning structure (4) for horizontally splicing two sections of sheet piles to form a pile wall; the concave-convex positioning structure (4) extending along the entire length of the sheet pile body (1); the forming mold comprising a matching upper mold (M1) and a lower mold (M2); the characteristics are: The upper mold (M1) and the lower mold (M2) are two unit U-shaped plate molds (5) with completely identical structures. Each of the unit U-shaped plate molds (5) has a combined mold cavity (5a) for forming 3 / 4 of one section of a U-shaped sheet pile and 1 / 4 of another section of a U-shaped sheet pile. After the two unit U-shaped plate molds (5) are combined, the two combined mold cavities (5a) cooperate to form a U-shaped sheet pile cavity capable of centrifugally molding two sections of U-shaped sheet piles at one time. The unit U-shaped plate formwork (5) is composed of two cavity plates (6), multiple support plates (7) and multiple semicircular unit running wheel rings (81); the two cavity plates (6) are welded together to form a combined cavity (5a) as described above, and the cavity plate (6) used to form the inclined surface (121) of the U-shaped sheet pile connecting arm (12) is installed with a partition (9) for separating the two sections of the U-shaped sheet pile; multiple support plates (7) are welded to the outer surfaces of the two cavity plates (6) with equal arcs, and multiple unit running wheel rings (81) are arranged in the length direction. The unit running wheel rings (81) of the two unit U-shaped plate molds (5) form a complete annular running wheel (8) after the mold is closed; the partition (9) is composed of a slot partition plate (91) for forming a positioning groove (42) of two sections of U-shaped sheet piles at the same time and a connecting arm partition plate (92) connected to the center position of the slot partition plate (91) for separating the two sections of U-shaped sheet piles; a plurality of partition connectors (93) are provided between the partitions (9) on the two unit U-shaped plate molds (5) at equal intervals in the longitudinal direction of the partition (9).

2. The forming mold for a centrifugally formed concrete U-shaped sheet pile according to claim 1, characterized in that: The slot partition plate (91) is provided with an arc-shaped protrusion (91a) for forming the water stop groove (4a); or the slot partition plate (91) is provided with a receiving groove that matches the shape of the steel groove connecting key (J).

3. The forming mold for a centrifugally formed concrete U-shaped sheet pile according to claim 2, wherein: The two cavity plates (6) include a rectangular flat cavity plate (61) and an inclined cavity plate (62) with two sides symmetrically bent and inclined surfaces (621) with an inclination angle greater than 5 degrees. After the inclined surfaces (621) are welded to the flat cavity plate (61), the internal angle (α) between the inclined surfaces (621) and the flat cavity plate (61) is greater than 95 degrees.

4. The forming mold for a centrifugally formed concrete U-shaped sheet pile according to claim 2, wherein: The two cavity plates (6) are both rectangular flat cavity plates (61), and one of the two flat cavity plates (61) is symmetrically welded on both sides with a modified plate (63) for forming the inclined surface (121) of the connecting arm (12); the modified plate (63) is a right-angled triangular steel plate with an acute angle of 10 degrees.

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