CN221118465U

CN221118465U - Centrifugal formed concrete U-shaped sheet pile

Info

Publication number: CN221118465U
Application number: CN202323007115.7U
Authority: CN
Inventors: 王树峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-11-08
Filing date: 2023-11-08
Publication date: 2024-06-11
Anticipated expiration: 2033-11-08

Abstract

The utility model discloses a centrifugally-formed concrete U-shaped sheet pile, which comprises a sheet pile body, wherein a semicircular cavity is formed in the center along the axial direction of the sheet pile body, and the sheet pile body is formed by prefabricating concrete and a U-shaped steel reinforcement cage by adopting a centrifugal method; the cross section of sheet pile body personally submits U type structure, and the fender face of enclosing of sheet pile body is a plane, and the side of two linking arms of sheet pile body is an inclined plane, and the contained angle between inclined plane and the fender face of enclosing is greater than 95 degrees, and the tip shaping of two linking arms has the unsmooth screens structure that is used for making two sections sheet piles transversely splice formation stake wall. The forming die comprises an upper die and a lower die, wherein the upper die and the lower die are two unit U-shaped plate dies with the same structure, and each unit U-shaped plate die is provided with a combined cavity for forming 3/4 parts of one section of U-shaped plate pile and 1/4 parts of the other section of U-shaped plate pile; after the two unit U-shaped plate molds are assembled, the two combined type cavities are matched to form a U-shaped plate pile cavity capable of centrifugally forming two sections of U-shaped plate piles at a time.

Description

Centrifugal formed concrete U-shaped sheet pile

Technical Field

The utility model relates to the technical field of concrete precast piles, in particular to a centrifugally formed concrete U-shaped sheet pile.

Background

The concrete sheet pile is a concrete prefabricated part for replacing a steel sheet pile, and is widely applied to the fields of underwater bearing platform cofferdam, silt and sand infiltration prevention engineering, various deep foundation enclosures, underground garage supporting engineering, pump station house cofferdam, large-scale pipeline support, high-speed railway pier enclosures, embankment reconstruction cofferdam, foundation pit enclosures and other relevant engineering enclosures. The traditional concrete sheet piles are produced by a vibration forming method, the production method is low in efficiency, the concrete density is not high, and the safety and stability are relatively insufficient.

Disclosure of Invention

Aiming at the current state of the art, the utility model provides the centrifugal formed concrete U-shaped sheet pile which has high density, good bending resistance and low production cost and is suitable for mass production.

The technical scheme adopted for solving the technical problems is as follows:

a centrifugally formed concrete U-shaped sheet pile comprises a sheet pile body with a semicircular cavity formed in the center along the axial direction, wherein the sheet pile body is formed by prefabricating concrete and a U-shaped steel reinforcement cage by a centrifugal method; the cross section of the sheet pile body is of a U-shaped structure, the enclosing and blocking surface of the sheet pile body is a plane, the side surfaces of the two connecting arms of the sheet pile body are inclined planes, the inner included angle between the inclined planes and the enclosing and blocking surface is larger than 95 degrees, and the end parts of the two connecting arms are formed with concave-convex clamping structures for transversely splicing the two section sheet piles to form a pile wall; the concave-convex clamping structure extends along the whole length of the sheet pile body.

In order to optimize the technical scheme, the specific measures adopted further comprise:

The concave-convex clamping structure consists of a clamping convex block and a clamping groove which can clamp the clamping convex block; the clamping convex block is formed on the inner half side of the end part of the connecting arm, and the clamping groove is formed on the outer half side of the end part of the connecting arm; when two sections of sheet piles are transversely spliced, the clamping convex blocks of one section of sheet pile are clamped into the clamping grooves of the other section of sheet pile.

The side surface of the clamping convex block, which is positioned in the clamping groove, is provided with a semicircular water stopping groove, and the water stopping grooves of the two section of sheet piles can be combined into a circular grouting water stopping hole for injecting water stopping materials when the pile piles are transversely spliced; or the side surface of the clamping convex block in the clamping groove is pre-embedded with a steel groove connecting key, and the steel groove connecting keys of the two sections of sheet piles are matched with each other in a unhook-preventing way when the piles are transversely spliced.

Pile end plates are arranged at two ends of the sheet pile body.

The U-shaped steel reinforcement cage consists 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 steel bars and the longitudinal main steel bars are fixedly connected into a whole by adopting a welding or binding mode; the two ends of the auxiliary steel bar are held to form an anti-unhooking hook which is matched with the longitudinal main steel bar hook arranged at the uppermost end of the U-shaped opening in a positioning way.

The utility model also provides a forming die of the centrifugally formed concrete U-shaped sheet pile, which comprises an upper die and a lower die which are matched; the upper die and the lower die are two unit U-shaped plate dies with identical structures, and each unit U-shaped plate die is provided with a combined cavity for forming 3/4 parts of one section of U-shaped plate pile and forming 1/4 parts of the other section of U-shaped plate pile; after the two unit U-shaped plate molds are assembled, the two combined type cavities are matched to form a U-shaped plate pile cavity capable of centrifugally forming two sections of U-shaped plate piles at a time.

The unit U-shaped plate die consists of two cavity plates, a plurality of supporting plates and a plurality of semicircular unit running wheel rings; the two cavity plates are welded and connected into a whole to form the combined cavity, and a baffle plate for separating two sections of U-shaped piles is arranged on one of the two cavity plates for forming the inclined plane of the U-shaped pile connecting arm; a plurality of supporting plates are welded on the outer surfaces of the two cavity plates in an equal radian manner, and a plurality of unit running wheel rings are welded at the outer ends of the supporting plates at equal intervals in the length direction; after the unit running wheel rings of the two unit U-shaped plate molds are assembled, a complete annular running wheel is formed; the partition plate consists of a clamping groove partition plate for simultaneously forming clamping grooves of two sections of U-shaped sheet piles and a connecting arm partition plate connected to the center of the clamping groove partition plate and used for separating connecting arms of the two sections of U-shaped sheet piles; a plurality of partition connectors are arranged between the partition plates on the two unit U-shaped plate molds at equal intervals in the length direction of the partition plates (9).

The clamping groove partition plate is provided with an arc-shaped lug for forming the water stop groove; or the clamping groove separating plate is provided with an accommodating groove which is matched with the shape of the steel groove connecting key.

The two cavity plates comprise a rectangular flat cavity plate and an inclined surface cavity plate with inclined surfaces with the inclination angle larger than 5 degrees, wherein the inclined surfaces and the flat cavity plate are welded, and the inner included angle between the inclined surfaces and the flat cavity plate is larger than 95 degrees.

The two cavity plates are rectangular flat cavity plates, and the two sides of one of the two flat cavity plates are symmetrically welded with a modifying plate for forming the inclined plane of the connecting arm; the modified plate is a right triangle steel plate with an acute angle of more than 5 degrees.

Compared with the comparison document, the sheet pile is a U-shaped sheet pile which is prefabricated and formed by concrete and a U-shaped steel reinforcement cage by adopting a centrifugal method. The U-shaped sheet pile formed by adopting the centrifugal method has the advantages of high density, good bending resistance and low production cost. The utility model also forms concave-convex clamping structures at the end parts of the two connecting arms of the sheet pile body, and the two sections of U-shaped sheet piles can be spliced in the transverse direction conveniently through the concave-convex clamping structures, so that the pile wall for enclosure is formed. The utility model also discloses a forming die for forming the U-shaped sheet pile, which consists of two unit U-shaped sheet dies with identical structures, wherein the two unit U-shaped sheet dies are matched to form an upper die and a lower die of the die, and each unit U-shaped sheet die is provided with a combined die cavity for forming 3/4 parts of one section of U-shaped sheet pile and 1/4 parts of the other section of U-shaped sheet pile; after the two unit U-shaped plate molds are assembled, the two combined type cavities are matched to form a U-shaped plate pile cavity capable of centrifugally forming two sections of U-shaped plate piles at a time. The die disclosed by the utility model has the advantages of high production efficiency, good safety and stability and suitability for mass production.

Drawings

FIG. 1 is a schematic perspective view of a U-shaped sheet pile according to the present utility model;

FIG. 2 is a cross-sectional view of the U-shaped sheet pile of FIG. 1;

FIG. 3 is a plan view of the U-shaped sheet pile of FIG. 1 transversely spliced to form a pile wall;

FIG. 4 is a schematic diagram showing a U-shaped sheet pile according to the second embodiment of the present utility model;

FIG. 5 is a plan view of the U-shaped sheet pile of FIG. 4 transversely spliced to form a pile wall;

FIG. 6 is a schematic cross-sectional view of a U-shaped sheet pile die of the present utility model;

FIG. 7 is a schematic cross-sectional view of the unit U-shaped plate mold constituting the upper mold or the lower mold of FIG. 6;

FIG. 8 is a schematic diagram of a cross-sectional structure of a U-shaped sheet pile mold according to the present utility model;

FIG. 9 is a schematic view of the mold of FIG. 8 with a spacer mounted thereon;

FIG. 10 is a schematic cross-sectional view of the unit U-shaped plate mold constituting the upper or lower mold of FIG. 8;

FIG. 11 is a schematic cross-sectional view of a die and formed U-shaped sheet pile of the present utility model;

FIG. 12 is a schematic view of the structure of the separator of the present utility model;

FIG. 13 is a schematic perspective view of the connection of the bulkhead to the bulkhead connector according to the utility model;

FIG. 14 is a schematic cross-sectional view of a bulkhead connector according to the utility model;

FIG. 15 is a schematic cross-sectional view of another five separator plates according to the present utility model.

Detailed Description

Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 15 are schematic structural views of a U-shaped sheet pile and a forming mold thereof according to the present utility model.

Wherein the reference numerals are as follows: the inner included angle alpha, the grouting water stop hole K, the upper die M1, the lower die M2, the sheet pile body 1, the semicircular cavity 1a, the enclosing surface 11, the connecting arm 12, the inclined surface 121, the concrete 2, the U-shaped reinforcement cage 3, the longitudinal main rib 31, the auxiliary reinforcement 32, the unhook 321, the concave-convex clamping structure 4, the water stop groove 4a, the clamping convex block 41, the clamping groove 42, the unit U-shaped plate 5, the combined die cavity 5a, the die cavity plate 6, the flat die cavity plate 61, the inclined surface die cavity plate 62, the inclined angle inclined surface 621, the refitting plate 63, the supporting plate 7, the running wheel 8, the unit running wheel ring 81, the partition plate 9, the clamping groove partition plate 91, the arc convex block 91a, the connecting arm partition plate 92 and the partition plate connector 93.

As shown in fig. 1 and 5, the utility model discloses a centrifugally formed concrete U-shaped sheet pile, which comprises a sheet pile body 1 with a semicircular cavity 1a formed in the center along the axial direction, wherein the sheet pile body 1 consists of concrete 2 and a U-shaped reinforcement cage 3 pre-buried in the concrete 2, and the sheet pile body 1 is preformed by a centrifugal method by utilizing a centrifugal die. The sheet pile body 1 formed by adopting 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 of the enclosure required by the pile wall, and the cross section of the sheet pile body is of a U-shaped structure shown in fig. 2. The enclosing and blocking surface 11 of the sheet pile body 1 is a rectangular plane, the sheet pile body 1 with a U-shaped structure is provided with two connecting arms 12, the outer side surfaces of the connecting arms 12 are inclined planes 121, and the inner included angle alpha between the inclined planes 121 and the enclosing and blocking surface 11 is more than 95 degrees, and is optimally less than 102 degrees. The ends of the two connecting arms 12 of the sheet pile body 1 are provided with concave-convex clamping structures 4, and the concave-convex clamping structures 4 extend along the whole length of the sheet pile body 1. According to the utility model, two sections of U-shaped plate piles can be easily spliced in the transverse direction through the concave-convex clamping matching of the concave-convex clamping structure 4, so that a pile wall for enclosure is formed.

As can be seen from fig. 2, 3 and 5, the concave-convex clamping structure 4 of the present utility model is composed of a clamping convex block 41 and a clamping groove 42 which can clamp the clamping convex block 41; the clamping projection 41 is formed on the inner half side of the end part of the connecting arm 12, and the clamping groove 42 is formed on the outer half side of the end part of the connecting arm 12; the detent projections 41 of one sheet pile snap into the detent recesses 42 of the other sheet pile when the two U-shaped sheet piles are transversely spliced.

As shown in fig. 1, 2 and 3, a semicircular water stopping groove 4a is formed on the side surface of the clamping projection 41 in the clamping groove 42, and the water stopping grooves 4a of two section of sheet piles can be combined into a circular grouting water stopping hole K for injecting water blocking materials when the piles are transversely spliced. Of course, the water stop groove 4a may be formed on the top surface of the locking projection 41 and the bottom surface of the locking groove 42. When the water stopping grooves 4a are formed on the top surface of the clamping protruding block 41 and the bottom surface of the clamping groove 42, when two sections of piles are transversely spliced, the water stopping grooves 4a formed on the top surface of the clamping protruding block 41 can be matched with the water stopping grooves 4a formed on the bottom surface of the clamping groove 42 to form a circular grouting water stopping hole K for injecting water blocking materials.

As shown in fig. 4 and 5, the present utility model also provides another U-shaped sheet pile, which is designed with a steel groove connection key J in the clamping groove 42, and the steel groove connection key J is pre-buried on the side surface of the clamping projection 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 matched with each other in an anti-unhook manner. The steel groove connecting key J is provided with a bent hook head body, a hook groove is formed between the hook head body and the side face of the clamping projection 41, which is positioned in the clamping groove 42, and when two sections of piles are transversely spliced, the hook head body of one section of piles is hooked into the hook groove of the other section of piles, so that the two sections of piles can form a whole. The pile wall formed by connecting the steel groove connecting keys J can bear large thrust, the problem that a certain position falls off does not exist, and water blocking materials can be injected into a gap formed by hooking the two sections of piles at the connecting position.

Pile end plates are arranged at two ends of the sheet pile body 1, are made of steel plates, and can be welded with a U-shaped steel reinforcement cage 3 in the U-shaped sheet pile into a whole before the U-shaped sheet pile is prefabricated and formed. Of course, the two ends of the U-shaped sheet pile of the utility model can be provided with no pile end plate, and the pile end plate has the advantages of preventing the pile end from damaging and affecting the use quality of the pile.

As can be seen from fig. 2, the U-shaped reinforcement cage 3 of the present utility model is composed of a plurality of longitudinal main bars 31 arranged in a U-shape and a plurality of auxiliary bars 32 arranged at equal intervals in the length direction of the longitudinal main bars 31. The auxiliary steel bars 32 and the longitudinal main steel bars 31 are fixedly connected into a whole by adopting a welding or binding mode; the two ends of the auxiliary steel bar 32 are held to form an anti-unhooking hook 321, and the anti-unhooking hook 321 is hooked and positioned with the longitudinal main steel bar 31 arranged at the uppermost end of the U-shaped opening.

The utility model relates to a forming die for a centrifugally formed concrete U-shaped sheet pile, which comprises two unit U-shaped sheet dies 5 with identical structures, wherein the two unit U-shaped sheet dies 5 are matched to form an upper die M1 and a lower die M2 of a die for forming the U-shaped sheet pile. Each unit U-shaped sheet mould 5 has a combined mould cavity 5a for forming 3/4 of a section of U-shaped sheet piles and 1/4 of another section of U-shaped sheet piles. After the two unit U-shaped plate molds 5 are assembled, the two combined type cavities 5a are matched to form a U-shaped plate pile cavity capable of centrifugally forming two sections of U-shaped plate piles at a time. The U-shaped plate mould 5 of each unit can form 3/4 parts of one section of U-shaped plate pile and 1/4 parts of the other section of U-shaped plate pile, and the design of the combined type cavity 5a is more beneficial to demoulding after the forming of the plate pile due to the inclined planes 121 on the two sides of the U-shaped plate pile.

In the embodiment, the unit U-shaped plate die 5 of the utility model consists of two cavity plates 6, a plurality of supporting plates 7 and a plurality of semicircular unit running rings 81; the two cavity plates 6 are welded together to form the combined cavity 5a, and the partition 9 for separating the two sections of U-shaped piles is mounted on the one of the two cavity plates 6 for forming the inclined surface 121 of the U-shaped pile connecting arm 12 (as shown in fig. 9 and 11). A plurality of support plates 7 are welded on the outer surfaces of the two cavity plates 6 in an equal radian manner, and a plurality of unit running rings 81 are welded on the outer ends of the support plates 7 at equal intervals 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 mold closing. Five support plates 7 are welded on each unit U-shaped plate die 5, and one support plate 7 is welded at the die clamping positions at two ends of the unit U-shaped plate die 5.

As shown in fig. 12, 13 and 14, the partition 9 of the present utility model is composed of a slot partition plate 91 for simultaneously forming the detent grooves 42 of two sections of U-shaped sheet piles and a connecting arm partition plate 92 connected to the center of the slot partition plate 91 for separating the connecting arms 12 of the two sections of U-shaped sheet piles. A plurality of partition connectors 93 are provided between the partition plates 9 on the two unit U-shaped plate molds 5 at equal intervals in the longitudinal direction of the partition plates 9. The bulkhead 9 of the present utility model may be applied to the separation of any centrifugally formed concrete preform.

As shown in fig. 12, the groove partition plate 91 of the present utility model is provided with an arc-shaped projection 91a for molding the water stop groove 4 a. A, b, c, d, e in fig. 15 shows a design structure diagram of another five partition boards 9 according to the present utility model, and the position of the arc-shaped protruding block 91a on the partition board 9 can determine the position of the grouting water stop hole K formed after pile splicing. Of course, as in d in fig. 15, the arc-shaped projection 91a may not be provided.

When the steel groove connection key J is designed in the clamping groove 42 of the U-shaped sheet pile, as shown in fig. 12, the partition 9 at this time is changed into a concave containing groove which can be matched with the shape of the steel groove connection key J, that is, the clamping groove partition 91 is provided with a containing groove which is matched with the shape of the steel groove connection key J.

In the embodiment, as shown in fig. 6 and 7, the two cavity plates 6 are composed of a rectangular flat cavity plate 61 and a sloping cavity plate 62. The inclined cavity plate 62 is made of rectangular steel plate, and inclined surfaces 621 are symmetrically bent and formed on two sides of the inclined cavity plate 62, wherein the bent and held angle of the inclined surfaces 621 is more than 5 degrees and less than 12 degrees. The inner angle alpha between the inclined surface 621 and the flat cavity plate 61 is greater than 95 degrees and less than 102 degrees after the inclined surface 621 is welded to the flat cavity plate 61.

In the embodiment, as shown in fig. 8 to 10, the two cavity plates 6 of the present utility model may be two flat cavity plates 61 with the same structure, the two flat cavity plates 61 are rectangular steel plates, the two flat cavity plates 61 are welded and connected into a whole at 90 degrees, and two sides of one flat cavity plate 61 in the two flat cavity plates 61 are symmetrically welded with the modified plates 63 for forming the inclined surfaces 121 of the connecting arms 12. The retrofit plate 63 is a right triangle steel plate having an acute angle greater than 5 degrees and less than 12 degrees.

The utility model relates to a forming method of a centrifugally formed concrete U-shaped sheet pile, which comprises the steps of temporarily fixing a U-shaped reinforcement cage 3 and a partition plate 9 in an upper die M1 and a lower die M2 of a centrifugal die, separating two sections of precast piles by utilizing the partition plate 9, distributing concrete 2 into the die, hanging the die on a centrifugal machine to manufacture piles in a centrifugal mode, and finally obtaining the U-shaped sheet pile through the processes of standing, steaming, demoulding and the like after the centrifugation is finished.

The preferred embodiments of this utility model have been described so far that various changes or modifications may be made by one of ordinary skill in the art without departing from the scope of this utility model.

Claims

1. The utility model provides a centrifugal shaping's concrete U type sheet pile, has sheet pile body (1) of semicircular cavity (1 a), characterized by including the center along axial shaping: the sheet pile body (1) is prefabricated and formed by concrete (2) and a U-shaped reinforcement cage (3) by adopting a centrifugal method; the cross section of the sheet pile body (1) is of a U-shaped structure, the enclosing surface (11) of the sheet pile body (1) is a plane, the side surfaces of two connecting arms (12) of the sheet pile body (1) are inclined planes (121), the inner included angle (alpha) between the inclined planes (121) and the enclosing surface (11) is larger than 95 degrees, and the end parts of the two connecting arms (12) are formed with concave-convex clamping structures (4) for transversely splicing two section sheet piles to form a pile wall; the concave-convex clamping structure (4) extends along the whole length of the sheet pile body (1).

2. A centrifugally formed concrete U-shaped sheet pile in accordance with claim 1 wherein: the concave-convex clamping structure (4) consists of a clamping convex block (41) and a clamping groove (42) which can clamp the clamping convex block (41); the clamping convex blocks (41) are formed on the inner half side of the end part of the connecting arm (12), and the clamping grooves (42) are formed on the outer half side of the end part of the connecting arm (12); when two sections of sheet piles are transversely spliced, the clamping convex blocks (41) of one section of sheet pile are clamped into the clamping grooves (42) of the other section of sheet pile.

3. A centrifugally formed concrete U-shaped sheet pile in accordance with claim 2, wherein: the side surface of the clamping convex block (41) in the clamping groove (42) is provided with a semicircular water stopping groove (4 a), and the water stopping grooves (4 a) of the two sections of sheet piles can be combined into a circular grouting water stopping hole (K) for injecting water blocking materials when the piles are transversely spliced; or the side surface of the clamping convex block (41) in the clamping groove (42) is pre-embedded with a steel groove connecting key (J), and the steel groove connecting keys (J) of the two sections of sheet piles are matched with each other in an anti-unhooking manner when the piles are transversely spliced.

4. A centrifugally formed concrete U-shaped sheet pile according to claim 3, wherein: pile end plates are arranged at two ends of the sheet pile body (1).

5. A centrifugally formed concrete U-shaped sheet pile in accordance with claim 4 wherein: the U-shaped reinforcement cage (3) consists of a plurality of longitudinal main ribs (31) which are arranged in a U shape and a plurality of auxiliary reinforcing bars (32) which are arranged at equal intervals in the length direction of the longitudinal main ribs (31); the auxiliary steel bars (32) and the longitudinal main steel bars (31) are fixedly connected into a whole by adopting a welding or binding mode; the two ends of the auxiliary steel bar (32) are held to form an anti-unhooking hook (321), and the anti-unhooking hook (321) is in hooking and positioning fit with a longitudinal main bar (31) arranged at the uppermost end of the U-shaped opening.

6. A centrifugally formed concrete U-shaped sheet pile in accordance with claim 5 wherein: comprises an upper die (M1) and a lower die (M2) which are matched with each other; the upper die (M1) and the lower die (M2) are two unit U-shaped plate dies (5) with identical structures, and each unit U-shaped plate die (5) is provided with a combined die cavity (5 a) for forming 3/4 parts of one section of U-shaped plate piles and 1/4 parts of the other section of U-shaped plate piles; after the two U-shaped plate molds (5) are assembled, the two combined mold cavities (5 a) are matched to form a U-shaped plate pile mold cavity capable of centrifugally forming two sections of U-shaped plate piles at one time.

7. A centrifugally formed concrete U-shaped sheet pile in accordance with claim 6 wherein: the unit U-shaped plate die (5) consists of two cavity plates (6), a plurality of supporting plates (7) and a plurality of semicircular unit running rings (81); the two cavity plates (6) are welded and connected into a whole to form the combined cavity (5 a), and a baffle plate (9) for separating two sections of U-shaped piles is arranged on the cavity plate (6) of the two cavity plates (6) for forming the inclined surface (121) of the U-shaped pile connecting arm (12); a plurality of supporting plates (7) are welded on the outer surfaces of the two cavity plates (6) in an equal radian manner, and a plurality of unit running rings (81) are welded at the outer ends of the supporting plates (7) at equal intervals in the length direction; after the two unit running wheel rings (81) of the unit U-shaped plate mold (5) are assembled, a complete annular running wheel (8) is formed; the partition plate (9) consists of a clamping groove partition plate (91) for simultaneously forming clamping grooves (42) of two sections of U-shaped sheet piles and a connecting arm partition plate (92) connected to the center of the clamping groove partition plate (91) and used for separating connecting arms (12) of the two sections of U-shaped sheet piles; a plurality of partition connectors (93) are provided between the partition plates (9) on the two unit U-shaped plate molds (5) at equal intervals in the longitudinal direction of the partition plates (9).

8. A centrifugally formed concrete U-shaped sheet pile in accordance with claim 7 wherein: the clamping groove partition plate (91) is provided with an arc-shaped lug (91 a) for forming the water stop groove (4 a); or the clamping groove separating plate (91) is provided with an accommodating groove which is matched with the shape of the steel groove connecting key (J).

9. A centrifugally formed concrete U-shaped sheet pile in accordance with claim 8 wherein: the two cavity plates (6) comprise a rectangular flat cavity plate (61) and an inclined surface cavity plate (62) with two sides symmetrically bent to be more than 5 degrees of inclined surface (621), and an inner included angle (alpha) between the inclined surface (621) and the flat cavity plate (61) is more than 95 degrees after the inclined surface (621) is welded with the flat cavity plate (61).

10. A centrifugally formed concrete U-shaped sheet pile in accordance with claim 9, wherein: the two cavity plates (6) are rectangular flat cavity plates (61), and refitted plates (63) for forming inclined surfaces (121) of the connecting arms (12) are symmetrically welded on two sides of one flat cavity plate (61) of the two flat cavity plates (61); the modified plate (63) is a right triangle steel plate with an acute angle of 10 degrees.