CN-121492217-B - Device for producing concrete hollow pile by core pulling method

CN121492217BCN 121492217 BCN121492217 BCN 121492217BCN-121492217-B

Abstract

The invention discloses a device for producing a concrete hollow pile by a core pulling method, which comprises a die shell, wherein two stretching plates and pile end plates are respectively arranged on two sides of the interior of the die shell, a plurality of first bolt holes, first hanging rib holes and a first center hole are arranged on the pile end plate, a stretching steel rod penetrates into the first hanging rib holes, a core mould structure for supporting the concrete hollow pile is arranged between the pile end plates, a rigid-flexible combined core mould is formed by adopting a lining steel pipe and a flexible first rubber cloth cladding, a transition flange is adopted to separate a stretching head from the pile end plates for a distance, so that the core mould and the pile end plates can relatively slide and ensure sealing, the lining steel pipe is firstly extracted after the prestressed ribs are released, and the flexible first rubber cloth cladding loses support and is separated from the inner wall of the hollow pile.

Inventors

SUN DIE
GU QING
WU ZHIHONG
Zhou Xingxiong

Assignees

宁波建工广天构件有限公司

Dates

Publication Date: 20260508
Application Date: 20260114

Claims (3)

1. The device for producing the concrete hollow pile by the core pulling method is characterized by comprising a mold shell (1), wherein two tension plates and pile end plates (2) are respectively arranged on two sides of the interior of the mold shell (1), a plurality of first bolt holes (6), first rib hanging holes (5) and a first center hole (24) are formed in the pile end plates (2), tension steel rods (4) penetrate through the first rib hanging holes (5), a core mold structure for supporting the concrete hollow pile is arranged between the pile end plates (2), the core mold structure comprises lining steel pipes (12) inserted into the first center holes (24) of the pile end plates (2), first rubber cloth (13) is wrapped outside the lining steel pipes (12), and the first rubber cloth (13) is just clung to the first center holes (24) and is matched with the lining steel pipes (12) to form sealing; the tensioning plates are first tensioning plates (3), one of the first tensioning plates (3) is clung to one of the pile end plates (2), a plurality of first through holes (10) are formed in the first tensioning plates (3) in a penetrating mode, and first tensioning bolts (9) which are connected to the first bolt holes (6) in a threaded mode are inserted into the first through holes (10); a transition flange (7) is arranged between the other first pulling plate (3) and the other pile end plate (2), a second through hole (11) is arranged on the transition flange (7), and an extension pulling bolt (8) which is in threaded connection with the first bolt hole (6) is inserted into the first through hole (10) and the second through hole (11) on the same side; The lining steel tube (12) and the first rubber cloth (13) can be inserted into a second central hole (25) of the transition flange (7).
2. The device for producing the concrete hollow pile by the core pulling method according to claim 1, wherein a plurality of sleeves (26) are arranged between the other first pulling plate (3) and the other pile end plate (2), and extension pulling bolts (8) penetrating through the sleeves (26) and being inserted into and in threaded connection with the first bolt holes (6) are inserted into the first through holes (10) on the same side.
3. The device for producing the concrete hollow pile by the core pulling method is characterized by comprising a mold shell (1), wherein two tension plates and pile end plates (2) are respectively arranged on two sides of the interior of the mold shell (1), a plurality of first bolt holes (6), first rib hanging holes (5) and a first center hole (24) are formed in the pile end plates (2), tension steel rods (4) penetrate through the first rib hanging holes (5), a core mold structure for supporting the concrete hollow pile is arranged between the pile end plates (2), the core mold structure comprises a core mold traction plate (14) arranged in the first center hole (24), a plurality of second bolt holes (22) and second rib hanging holes (23) penetrate through the core mold traction plate (14), a plurality of annular array core mold steel rods (18) are inserted between the second rib hanging holes (23) on two sides, and a second rubber rod (19) is coated on the outer side of the core mold traction plate (14) and the inner circle surface of the first center hole (24); The stretching plate is a second stretching plate (15), a plurality of third through holes (20) and fourth through holes (21) are formed in the second stretching plate (15) in a penetrating mode, and second stretching bolts (16) which are connected with the second bolt holes (22) in a threaded mode penetrate through the third through holes (20); The second tensioning plate (15) is tightly attached to the pile end plate (2), and a third tensioning bolt (17) which can be connected with the first bolt hole (6) in a threaded mode is inserted into the fourth through hole (21).

Description

Device for producing concrete hollow pile by core pulling method Technical Field The invention relates to the field of concrete hollow pile production, in particular to a device for producing concrete hollow piles by a core pulling method. Background The traditional centrifugal method for producing the hollow square pile has the following defects: 1. the centrifugal force difference between the middle point and the corner points of the side edges of the hollow square pile produced by the centrifugal method is 1.4 times, so that coarse aggregate is gathered to 4 corner points in the concrete centrifugal process, and the layering and the uneven strength of the cross section are more serious than those of the tubular pile; 2. The centrifugal method is used for production, the die is required to bear the tensile counter force of hundreds of tons, a large section and stiffening members are required, the self weight is large, the cost is high, the inner diameter of the die of the hollow square pile is 1.4 times of the side length of the square pile, the self weight is larger, the electric energy consumed by centrifugal forming is higher, and the hearing damage of a worker caused by the noise of the centrifugal machine is also very large; 3. The centrifugal forming die is radially closed, so that the workload of die assembly and die disassembly is great, and automation is difficult; 4. the centrifugally formed core holes can only be circular, reducing the flexibility of the cross-sectional design of the component. While the pedestal method can solve most of the defects, the tensioning counterforce is borne by the pedestal, the die only bears the lateral pressure of concrete pouring, the die can be made of thinner steel plates, the cost is lower, the die is not required to be assembled or disassembled, and the higher automation level is easy to realize, the hollow loose core produced by the pedestal method can solve the following problems: 1. stretching by a pretensioning process, wherein the distance between two ends of a pile die and a tail plate can be prolonged, and a core die must be correspondingly prolonged to ensure no slurry leakage; 2. after the prestressed tendons are put to be stretched, pile body concrete transversely expands, and the core mould can be radially contracted to ensure demoulding; 3. before the concrete is hardened, the core mold needs to be ensured to be coincident with the square pile centroid, so that eccentric stress damage during pile sinking by hammering is avoided, and enough rigidity also needs to be ensured under the side pressure effect during concrete pouring; accordingly, the invention provides a device for producing the concrete hollow pile by the core pulling method. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a device for producing a concrete hollow pile by a core pulling method, which adopts a lining steel pipe and flexible first rubber cloth to cover the lining steel pipe and the flexible first rubber cloth to form a rigid-flexible combined core mould, adopts a transition flange to separate a tensioning head from a pile end plate for a certain distance, enables the core mould and the pile end plate to slide relatively and ensure sealing, firstly withdraws the lining steel pipe after a prestressed reinforcement is put into tension, and separates from the inner wall of the hollow pile after the flexible first rubber cloth covered outside loses support. Technical proposal The utility model provides a device of hollow pile of core-pulling method production concrete, includes the mould shell, the inside both sides of mould shell are provided with two tension plates and pile end board respectively, be provided with a plurality of first bolt hole, first string muscle hole and a first centre bore on the pile end board, penetrate on the first string muscle hole and stretch-draw steel bar, be provided with the mandrel structure that is used for supporting the hollow pile of concrete between the pile end board. Further, the core mold structure comprises a lining steel pipe inserted into the first central hole of the pile end plate, wherein the first rubber cloth is coated on the outer portion of the lining steel pipe, and the first rubber cloth is just clung to the first central hole and matched with the lining steel pipe to form a seal. Further, the tensioning plate is a first tensioning plate, one of the first tensioning plates is tightly attached to one of the pile end plates, a plurality of first through holes are formed in the first tensioning plate in a penetrating mode, and first tensioning bolts in threaded connection with the first bolt holes are inserted into the first through holes. Further, a transition flange is arranged between the first pulling plate and the pile end plate, a second through hole is formed in the transition flange, an extension tensioning bolt which is in threaded connection with the first bolt hole