Forming die for longitudinal variable cross-section prestressed concrete pile

Abstract

The utility model discloses a forming die of a longitudinal variable cross-section prestressed concrete pile, which comprises an upper die and a lower die which are matched for use, the upper die and the lower die have the same longitudinal variable cross-section size position, and the upper die and the lower die are provided with longitudinal matchboards required by die assembly according to use requirements. Cylinder bodies of the upper die and the lower die are composed of steel plates and non-metal composite steel plates in a segmented mode, the non-metal composite steel plates are adopted on the pressed side faces of die protruding sections of the upper die and the lower die according to the variable cross-section longitudinal requirement of the concrete pile, and common die steel plates are adopted along the invariable portions of the longitudinal cross section. Due to the fact that the prestressed reinforcement generates pre-pressure on the concrete, when the pile body concrete shrinks, shrinkage stress generated by the variable cross section is absorbed by the non-metal material with the small elasticity modulus in the non-metal composite steel plate, and it is guaranteed that the variable cross section part of the concrete pile can be demolded completely.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engineering construction, in particular to a forming die equipment technology of longitudinal variable cross section prestressed concrete pile. BACKGROUND

[0002] The existing longitudinal variable cross section prestressed concrete pile of the mould generally has two kinds, one is that the longitudinal section of the mould cylinder is not changed, the steel lining plate is welded in the mould cylinder, the concrete pile appearance is changed to reach the design size, the other is that the variable cross section cylinder is directly used, the size of the concave-convex section of the cylinder is designed according to the design size of the concrete pile, due to the compression of the prestressed concrete when demoulding, the two methods can only produce the prestressed concrete precast pile with low convex height of the pile body and large included angle between the convex side of the pile body and the pile body. CN101143465B is in the form of welding steel lining plate, and CN101143465B is in the form of directly using variable cross section cylinder.

[0003] CN116079865A and CN102825658A are both in the form of double-layer mould, the outer mould is made of thick steel plate as a steel mould, and the inner mould is made of thin steel plate as a flexible mould, the surface of the inner mould is matched with the outer surface of the prestressed concrete variable cross section pile. The double-layer steel mould has high requirements for the travelling crane in the production process, the inner mould is easy to deform and be clamped, and the cost is high.

[0004] There is also a solution of embedding elastic material and rigid material, but the design is not reasonable, the materials and methods are not suitable, and practical production and application are not realized. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problems in the prior art, and provides a forming die for longitudinal variable cross section prestressed concrete pile, which is simple to manufacture, light in weight, widely applicable, low in production cost, and has the unique design of combining the strength of the steel plate and the flexibility of the non-metal composite steel plate, so that the variable cross section part of the pile body can be smoothly formed in the manufacturing process, and damage in the tensioning process is avoided.

[0006] The utility model solves the technical problems by adopting the following technical scheme:

[0007] A forming die for longitudinal variable cross-section prestressed concrete pile, comprising an upper die and a lower die formed by a die cylinder, the die cylinder (1) is segmented and longitudinally distributed by a steel plate (2) with constant cross-section and a non-metallic composite steel plate (3); the surface of the non-metallic composite steel plate is a convex part corresponding to the recessed variable cross-section of the prefabricated pile, and the elastic modulus of the non-metallic composite steel plate is less than that of steel; the upper die and the lower die are provided with a longitudinal tongue and groove rib plate composed of a steel plate and a non-metallic composite steel plate at the die closing position, and when the longitudinal variable cross-section prestressed concrete pile is released, the non-metallic composite steel plate deforms with the pile body;

[0008] The non-metallic convex part of the non-metallic composite steel plate adopts a steel plate to form a convex shape smaller than the size of the pile recess, and the size difference between the two is filled with a non-metallic composite steel plate with an elastic modulus less than that of steel, or only the side of the corresponding convex part at the release end is provided with a non-metallic composite steel plate;

[0009] The upper die and the lower die formed by the die cylinder are distributed according to the shape and size of the formed pile, the size of the convex part of the cylinder is smaller than the size of the recess of the pile, and the size difference between the two is filled with a non-metallic composite steel plate with an elastic modulus less than that of steel, and only the side of the corresponding convex part at the release end is provided with a non-metallic composite steel plate.

[0010] Preferably, the convex part is provided with a whole die or only a part of the length of the die, and the other part of the die is not provided with a variable cross-section convex part inside.

[0011] Preferably, the convex part is provided with a whole die or only a part of the length of the die, and the other part of the die is not provided with a variable cross-section convex part inside.

[0012] Preferably, the non-metallic composite steel plate is directly bonded to the steel plate of the die cylinder, or is fixed by bolts.

[0013] Preferably, the non-metallic material part of the non-metallic composite steel plate inside the die is directly in contact with the concrete, or a thin steel plate is bonded or fixed by bolts on the non-metallic material part.

[0014] Preferably, the thickness of the non-metallic material part of the non-metallic composite steel plate provided only on the side of the corresponding convex part at the release end is calculated and determined to be the minimum thickness according to the elastic modulus and the pre-stress value of the pile body.

[0015] Preferably, the angle between the convex side of the non-metallic composite steel plate and the longitudinal surface is not less than 90°, and the height of the convex part is determined according to the design size of the pile appearance.

[0016] Compared with the prior art, the mold of the utility model is composed of steel mold and non-metal elastic material. The single-layer mold is light in weight, easy to design different variable cross-section pile types, low in production cost, can ensure the pile quality, has high durability and can be used for many times without being damaged, and can be adjusted according to the needs of different pile types, so it has wide applicability and broad market prospect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a forming mold schematic view of the longitudinal variable cross-section prestressed concrete pile of the utility model;

[0018] Figure 2 is a forming mold schematic view of the longitudinal variable cross-section prestressed concrete pile of the utility model;

[0019] Figure 3 is a forming mold schematic view of the longitudinal variable cross-section prestressed concrete pile of the utility model;

[0020] Figure 4 is a forming mold schematic view of the longitudinal variable cross-section prestressed concrete pile of the utility model;

[0021] Figure 5 is a forming mold schematic view of the longitudinal variable cross-section prestressed concrete pile of the utility model;

[0022] Figure 6 is a forming mold schematic view of the longitudinal variable cross-section prestressed concrete pile of the utility model;

[0023] Figure 7 is a forming mold schematic view of the longitudinal variable cross-section prestressed concrete pile of the utility model;

[0024] Figure 8 is a sectional structure schematic view of the non-metal composite steel plate of the utility model;

[0025] Figure 9 is a sectional structure schematic view of the non-metal composite steel plate of the utility model;

[0026] Figure 10 is a sectional structure schematic view of the non-metal composite steel plate of the utility model. DETAILED DESCRIPTION

[0027] The embodiments of the utility model are further described in detail below with reference to the drawings.

[0028] Figures 1 to 10 is a structure schematic view of the forming mold of the longitudinal variable cross-section prestressed concrete pile of the utility model.

[0029] The reference numerals in the drawing are: included angle a, cylinder 1, cylinder steel plate 2 with constant cross section, inner lining convex steel plate 21 with constant cross section, variable cross section cylinder steel plate 22, non-metallic composite steel plate 3, non-metallic composite steel plate 31 of variable cross section side, upper die 4, lower die 5, longitudinal tongue and groove rib plate 6, die bolt 7, longitudinal rib plate 8, ring rib plate 9, spread end 10, thin steel plate 11, composite steel plate 12, non-metallic material 13, fixing bolt 14, and minimum distance L of fixing bolt edge.

[0030] Referring to Figure 1 , Figure 8 , Figure 9 , Figure 10 , Figure 1 The utility model discloses a kind of longitudinal variable cross section prestressed concrete pile's forming mould, including mould cylinder 1 forms completely symmetrical and can be used cooperatively upper die 4 and lower die 5, the longitudinal section size of cylinder 1 outside formed after upper die 4 and lower die 5 combination is unchanged, upper die 4 and lower die 5 are spaced apart and distributed in cylinder 1 steel plate interior by non-metallic material 13, form by steel plate 2 and non-metallic composite steel plate 3 sectional longitudinal design distribution convex shape according to the size of forming pile, by this setting, the longitudinal variable cross section precast pile can be formed.

[0031] The non-metallic surface of the non-metallic composite steel plate 3 used in the utility model is a convex part, corresponding to the recessed variable cross section of the precast pile, the elastic modulus of the non-metallic material is less than that of steel, which can follow the compression deformation of the pile body when being spread, avoiding the convex part being crushed by the steel plate.

[0032] The non-metallic material in the non-metallic composite steel plate 3 used in the utility model is generally directly bonded as shown in Figure 8 , bonding method, with the emergence of new cold adhesive materials, generally low-cost cold bonding can be used, which can meet the production process requirements, vulcanization hot bonding and other methods can also be used, which are relatively high in cost; also directly fixed with screws as shown in Figure 9 , Figure 10 According to the elastic modulus and Hooke's law, if bolt fixation is used, the minimum edge distance L of the bolt fixation point on the non-metallic material is about 20mm when the elastic modulus of the non-metallic material is 2000N / mm².

[0033] Figure 2The utility model provides a longitudinal variable cross section prestressed concrete pile forming die's implementation scheme provided by the utility model, including mould cylinder 1 forms completely symmetrical and can cooperate with using upper die 4 and lower die 5, the external longitudinal section size of the cylinder 1 formed after upper die 4 and lower die 5 combination is invariable, the inside of upper die 4 and lower die 5 is by steel sheet 21 and separates out convex shape, its shape size especially length is slightly smaller than the corresponding length of the variable cross section prefabricated pile formed by using the utility model, height can be same with the size of variable cross section prefabricated pile, the size difference of both adopts nonmetallic composite steel sheet 31, the size of the convex shape separated out by steel sheet 21 and smaller than the corresponding length of the variable cross section prefabricated pile formed by using the utility model is determined according to the elastic modulus of nonmetallic material and the determination of hooke's law, if the elastic modulus of nonmetallic material is 2000N / mm2, the minimum thickness of nonmetallic material of nonmetallic composite steel sheet 31 is about 20mm. Figure 3 For Figure 2 The optimization of the implementation scheme provided, according to the stress analysis of the stress shrinkage of prestressed concrete when tensioning, on the basis of the implementation scheme of Figure 2 The implementation scheme can be optimized, as shown in Figure 3 The nonmetallic composite steel sheet can be used on the corresponding convex side of the tensioning end 10, and it is not necessary to use the nonmetallic composite steel sheet 3 on both sides of the convex shape. The selection and arrangement of the nonmetallic composite steel sheet are the same as those in the implementation scheme. Figure 1

[0034] Figure 4 Another implementation scheme of the longitudinal variable cross section prestressed concrete pile forming die provided by the utility model, in the scheme, a variable cross section cylinder 1 is used, the cylinder steel sheet 22 is in a variable cross section shape, and the shape size, especially the length, is slightly longer than the corresponding length of the variable cross section prefabricated pile formed by using the utility model, the convex height can be the same as the size of the variable cross section prefabricated pile, and the size difference is used to adopt a nonmetallic composite steel sheet 31. The size of the convex shape separated by the cylinder steel sheet 22 and smaller than the corresponding length of the variable cross section prefabricated pile formed by using the utility model is determined according to the elastic modulus of nonmetallic material and the determination of hooke's law, if the elastic modulus of nonmetallic material is 2000N / mm2, the minimum thickness of nonmetallic material of nonmetallic composite steel sheet 31 is about 20mm. Figure 5 For Figure 4 The optimization of the implementation scheme provided, according to the stress analysis of the stress shrinkage of prestressed concrete when tensioning, on the basis of the implementation scheme of Figure 4 The implementation scheme can be optimized, as shown in Figure 5 The nonmetallic composite steel sheet can be used on the corresponding convex side of the tensioning end 10, and it is not necessary to use the nonmetallic composite steel sheet 3 on both sides of the convex shape. The selection and arrangement of the nonmetallic composite steel sheet are the same as those in the implementation scheme. Figure 1

[0035] On the basis of the above embodiment, Figure 6 ​​Another embodiment of the mold is provided, the barrel steel plate 2 of the upper mold 4 and the lower mold 5 of the mold is formed with a constant cross section, and the convex shape is arranged in the mold, only one section of the mold can be arranged according to the engineering application requirements, and the mold of the other section is not arranged with the convex shape. Figure 7 According to the embodiment of the mold, the barrel steel plate 22 of the upper mold 4 and the lower mold 5 of the mold can be directly designed according to the appearance of the pile, the shape and size of the pile are formed, the barrel convex is designed, only one section of the mold can be arranged according to the engineering application requirements, and the barrel of the mold of the other section is smooth without the convex.

[0036] On the basis of the above-mentioned embodiments,

[0037] The side surface of the non-metal composite steel plate convex arranged in the forming mold of the longitudinal variable cross-section prestressed concrete pile is not less than 90 degrees with the longitudinal horizontal angle of the mold, and the height of the convex is determined according to the appearance design size of the pile.

[0038] The best embodiment of the utility model has been illustrated, various changes or modifications made by ordinary skilled persons in the art without departing from the method and scope of the disclosure will not deviate from the scope of the utility model.

Claims

1. A molding die for a longitudinally variable cross-section prestressed concrete pile, comprising an upper die (4) and a lower die (5) formed by a die cylinder (1), characterized in that: The mold cylinder (1) is composed of steel plate (2) with constant cross section and non-metallic composite steel plate (3) arranged in a longitudinal distribution. The surface of the non-metallic composite steel plate (3) is a raised part, which corresponds to the concave cross section of the precast pile. Its elastic modulus is less than that of steel. The upper mold (4) and lower mold (5) are provided with a longitudinal tongue and groove reinforcement plate (6) composed of steel plate and non-metallic composite steel plate. When the longitudinally variable cross section prestressed concrete pile is released, the non-metallic composite steel plate (3) is compressed and deformed along with the pile body. The non-metallic protrusion of the non-metallic composite steel plate (3) is formed by steel plate into a protrusion shape smaller than the pile depression size. The part with the size difference is made of non-metallic composite steel plate with an elastic modulus smaller than that of steel, or non-metallic composite steel plate (3) is only set on the side of the corresponding protrusion at the tensioning end. The upper mold (4) and lower mold (5) formed by the mold cylinder (1) are designed and distributed according to the shape and size of the formed pile. The size of the protruding part of the cylinder is smaller than the size of the recessed part of the pile. The part with the size difference is made of non-metallic composite steel plate with an elastic modulus less than that of steel. Non-metallic composite steel plate is only set on the side of the corresponding protrusion at the tensioning end.

2. The forming mold for longitudinally variable cross-section prestressed concrete piles according to claim 1, characterized in that: The protrusions are set along the entire length of the mold, or only a portion of the mold is set, and the protrusions in other parts of the mold do not need to have variable cross-sections.

3. The forming mold for longitudinally variable cross-section prestressed concrete piles according to claim 1, characterized in that: The protrusions are set along the entire length of the mold, or only a portion of the mold cylinder is set, and the other parts of the mold cylinder do not have protrusions with varying cross-sections.

4. The forming mold for longitudinally variable cross-section prestressed concrete piles according to claim 2 or 3, characterized in that: it is non-metallic. The composite steel plate (3) is directly bonded to the steel plate of the mold cylinder (1) or fixed with bolts.

5. The forming mold for longitudinally variable cross-section prestressed concrete piles according to claim 4, characterized in that: it is non-metallic. The composite steel plate (3) is in direct contact with the concrete in the non-metallic material part inside the mold, or a thin steel plate is bonded or bolted to the non-metallic material part.

6. The forming mold for longitudinally variable cross-section prestressed concrete piles according to any one of claims 1-3, characterized in that: The thickness of the non-metallic material portion of the non-metallic composite steel plate (3) set only on the side of the protrusion at the tensioning end is determined by calculating the minimum thickness based on its elastic modulus and the prestress value of the pile body.

7. The forming mold for longitudinally variable cross-section prestressed concrete piles according to any one of claims 1-3, characterized in that: The angle between the raised side and the longitudinal surface of the non-metallic composite steel plate (3) is not less than 90°, and the height of the raised side is determined according to the design dimensions of the pile type.

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