CN217679045U

CN217679045U - Novel mechanical connection device for precast pile

Info

Publication number: CN217679045U
Application number: CN202221710461.4U
Authority: CN
Inventors: 金忠良; 李永波; 陈巧
Original assignee: Jianhua Construction Materials China Co Ltd
Current assignee: Jianhua Construction Materials China Co Ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2022-10-28
Anticipated expiration: 2032-07-05

Abstract

The utility model relates to a mechanical connection technical field specifically is a novel mechanical connection device of precast pile. The pile forming die comprises an upper pile section, a lower pile section, a die box and a connecting rod, wherein the die box is arranged at the lower part of the upper pile section, and an opening of the die box faces the periphery of a tubular pile; the lower end of the connecting rod is connected in the lower pile, and the upper end of the connecting rod penetrates through the lower surface of the mold box and is connected to the upper pile. And the rear wall of the die box is provided with a radial stiffening rib. The utility model discloses the scene need not extra welding, and the installation effectiveness is higher, and receives weather and constructor level to influence lessly.

Description

Novel mechanical connection device for precast pile

Technical Field

The utility model relates to a mechanical connection technical field specifically is a novel mechanical connection device of precast pile.

Background

The precast piles are commonly used supporting members in the field of constructional engineering, the connection mode among the precast piles mainly comprises welding, flange connection, thread type or meshing type mechanical quick connection, in the existing connection mode, the welding mainly adopts a mode of arranging steel end plates at two ends of a pile connecting part and then welding the steel end plates, the influence of weather and the operation level of constructors is large, the field welding quality is difficult to control, and when the pile diameter is large, the welding time is long, and the pile connecting efficiency is influenced; the flange connection is mainly a connection mode that flange plates are arranged at two ends of a pile splicing part, a flange pad is added between the two flange plates, and finally the two flange plates are tightened by bolts to be tightly combined, so that the requirement on the flatness of the end faces of the flange plates is high, and the manufacturing cost is high; the thread type or meshing type mechanical connection is mainly characterized in that thread teeth and meshing teeth are arranged at a pile splicing part, and then a connecting pin is inserted into a connecting groove shell, so that the requirement on the flatness of an end plate is high, and a plurality of mechanical joints cannot be effectively and completely inserted at the same time.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel mechanical connection device of precast pile that installation effectiveness is high, easy and simple to handle, installation stability is good.

The novel mechanical connection of the precast pile comprises an upper pile section, a lower pile section, a die box and a connecting rod, wherein the die box is arranged at the lower part of the upper pile section, and the opening of the die box faces to the periphery of the tubular pile; the lower end of the connecting rod is connected in the lower pile, and the upper end of the connecting rod penetrates through the lower surface of the die box and is connected to the upper pile.

Preferably, the rear wall of the mould box is provided with radial stiffening ribs.

Preferably, a hoop is further arranged on the upper section of pile, and a hole corresponding to the opening of the die box is formed in the outer side face of the hoop.

Preferably, the lower end of the upper pile is provided with an end plate, and the end plate is provided with a through hole for a connecting rod to pass through; the bottom surface of the die box is cancelled to be in an opening shape.

Preferably, the size of the opening of the mold box is larger than that of the face opposite to the opening.

Preferably, the inner edge of the mould box is a straight line edge or an arc line edge.

Preferably, when the internal thread sleeve is pre-embedded in the lower section of pile, the connecting rod is a bolt, and a nut is screwed into the die box for installation; and when the connecting rod in the lower section of pile is an exposed bolt, the die box is screwed with a nut for installation.

Preferably, the diameter of the distribution circle of the connecting rod is not less than that of the distribution circle of the prestressed tendons in the upper pile section and the lower pile section.

Preferably, the connecting rod is a high-strength bolt of 8.8 grade or 10.9 grade or 12.9 grade; the equal strength alternative form of 1 is taken to the prestressing tendons in connecting bolt and the upper and lower section stake, evenly arranges when prestressing tendons quantity is the even number, needs additionally to add a set of bolt when prestressing tendons is the odd number.

Preferably, after the connecting rod is installed, the mold box is filled and sealed with concrete.

The novel mechanical connecting device for the precast pile only needs to align the upper section pile and the lower section pile in place during installation and then screw in bolts or nuts, so that the novel mechanical connecting device is simple to operate and convenient to construct; extra welding is not needed on site, the installation efficiency is high, and the influence of weather and the level of constructors is small; and the installation effect is stable.

Reference numerals

FIG. 1 is a three-dimensional schematic view of a mechanical connection of precast piles;

FIG. 2 is a schematic view of a prefabricated pile connecting elevation using bolts;

FIG. 3 is a schematic view of a prefabricated pile connecting elevation with exposed bolts;

FIG. 4 is a three-dimensional schematic view of a mold box;

FIG. 5 is a diagram of the upper pile mould box layout;

FIG. 6 is a first schematic view of a lower pile section with an end plate;

FIG. 7 is a second schematic view of a lower pile section with an end plate;

FIG. 8 is a schematic view of an endless plate lower pile section;

FIG. 9 is a layout view of upper piles in case of odd tension holes;

FIG. 10 is a view showing the arrangement of upper piles in an even number of tension holes;

FIG. 11 is a schematic view of a mold box with straight inner edges;

FIG. 12 is a schematic view of a mold box with an arc inside;

wherein the reference numbers:

the die comprises a hoop 1, a die box 2, an upper end plate 3, a lower end plate 4, an internal thread sleeve 5, a threaded hole 6, a bolt 7, an exposed bolt 8, a nut 9, a stiffening rib 10, an upper tensioning hole 11, a lower tensioning hole 12 and a lower tensioning sleeve 13.

Detailed Description

As shown in fig. 1-8, the novel mechanical connecting device of precast pile, including upper segment stake and lower segment stake, the upper segment stake adopts and contains the end plate stake, contains upper end plate 3, diaphragm capsule 2, cuff 1 and stiffening rib 10, and lower segment stake adopts and contains the end plate stake or do not have the end plate stake, only need during the installation with the centering of upper and lower segment stake take one's place the back, twist bolt or nut can. In the upper section pile, the upper end plate 3 comprises an upper tensioning hole 11 and a threaded hole 6, the tensioning hole is used for tensioning the prestressed reinforcing steel, and the threaded hole 6 is used for installing a connecting bolt.

As shown in fig. 4, the structure diagram of the mold box 2 is shown, the mold box 2 is installed on the upper end plate 3 of the upper section pile, after the mold box 2 is installed, the mold box is a hollow plastic box which is kept closed on the outer side and the rest surfaces, the size of the opening of the mold box is larger than that of the surface opposite to the opening in the form of the outer height and the inner height, the embedded space required by installing the connecting bolt from the outside is not influenced, and meanwhile, the inner concrete is guaranteed to be poured compactly during subsequent hole filling without generating excessive cavities; utilize the short reinforcement to fix a position on the end plate during the installation of diaphragm capsule 2, and with the 6 centering of screw hole of up end plate 3, diaphragm capsule 2 is used for providing the required space of construction bolt, and the limit can adopt straight line limit or pitch arc limit (shown as fig. 11, fig. 12 respectively) in diaphragm capsule 2. In the upper pile section, the rear wall of each mould box 2 is provided with a radial stiffening rib 10, and the stiffening ribs 10 are welded on the upper end plate 3 and used for preventing bending instability outside the plane of the upper end plate 3. In the upper pile section, the outer side surface of the hoop 1 is provided with a plurality of holes and is arranged corresponding to the outer side surface of the die box 2, and the hoop and the die box are arranged outside the mounting position of the upper pile section and the lower pile section, so that direct detection is facilitated.

As shown in fig. 6-7, when the lower pile section adopts the pile containing the end plate, the lower end plate 4 is provided with a lower tension hole 12; as shown in fig. 8, when the lower pile is an endless pile, a lower tension sleeve 13 is provided. The upper section of pile and the lower section of pile are connected in a bolt-screwing and nut-screwing mode, when the internal thread sleeve 5 is embedded in the lower section of pile, the lower section of pile is aligned with the threaded hole 6 of the upper end plate 3 in place, and then the lower section of pile is screwed in the bolt 7 through the reserved mounting space of the die box 2 and is screwed tightly to realize connection; when the exposed bolt 8 is preset in the lower pile section, after the lower pile section and the threaded hole 6 of the upper end plate 3 are centered and positioned in place, the nut 9 is screwed in and screwed down to realize connection through the reserved installation space of the die box 2. When the connection mode of screwing the bolts is adopted, in order to reduce the weakening of a concrete area at the end part of the pile, the space of the die box is not too large, and the bolts 7 adopt hexagon socket head cap bolts; when the connection mode of screwing the nut is adopted, the reserved installation height of the die box 2 is low in requirement, the die box is small in height, the required height of the hoop 1 is small, and the material cost is low.

The connecting bolts can adopt 8.8-grade, 10.9-grade or 12.9-grade high-strength bolts, and the connecting bolts and the prestressed tendons adopt a one-to-many equal-strength substitution mode, so that the number of connecting joints can be reduced; in order to reduce the weakening of the end plate, the ratio of the number of the connecting bolts to the number of the prestressed tendons is preferably 0.5, namely, a mode that 1 connecting bolt is matched with every 2 prestressed tendons is adopted, the specification of the bolt obtained by equal-strength replacement is shown in a table 1, the minimum space size of annular installation of the bolt is shown in a table 2, and accordingly the requirement of installation specifications of bolts with multiple sizes can be effectively met. The connecting bolt not only satisfies the tensile strength, but also satisfies the bending strength requirement, and the bending resistance bearing capacity is related to the length of the inner force arm, so the diameter of the bolt 7 distribution circle is not less than the diameter of the prestressed tendon distribution circle, namely the bolt 7 is properly arranged outwards, so that the length of the inner force arm is not reduced on the basis of satisfying the tensile strength, and the requirement of the cross section bending strength is satisfied.

TABLE 1 connecting bolt specifications corresponding to different tendons

TABLE 2 minimum space size (mm) of inner hexagon bolt installed annularly

Bolt specification	Minimum margin	Outer side length L	Length of inner edge L ₁	Radial distance E	Hexagonal edge distance S	Circumferential distance A
							12	4.6	35	30	14	10	42
14	4.5	40	35	15	12	48
							16	4.0	45	40	16	14	55
18	4.4	45	40	19	14	62
							20	5.0	50	45	20	17	68
22	5.4	55	50	24	17	76
							24	4.2	55	50	24	19	80
27	5.5	65	60	26	19	90

As shown in fig. 9-10, when 1; after the connecting bolt 7 is installed, the excess cavity needs to be sealed by concrete.

Claims

1. A novel mechanical connecting device for precast piles is characterized by comprising an upper pile, a lower pile, a die box and a connecting rod, wherein the die box is arranged at the lower part of the upper pile, and the opening of the die box faces to the periphery of a pipe pile; the lower end of the connecting rod is connected in the lower pile, and the upper end of the connecting rod penetrates through the lower surface of the die box and is connected to the upper pile.

2. The novel mechanical connection device for precast piles according to claim 1, wherein the rear wall of the mold box is provided with radial stiffening ribs.

3. The novel mechanical connecting device for the precast pile as claimed in claim 1, wherein a hoop is further arranged on the upper pile, and a hole corresponding to the opening of the die box is arranged on the outer side surface of the hoop.

4. The novel mechanical connecting device for the precast pile as claimed in claim 1, wherein the lower end of the upper pile is provided with an end plate, and the end plate is provided with a through hole for a connecting rod to pass through; the bottom surface of the die box is cancelled to be in an opening shape.

5. A novel mechanical connection device for precast piles as claimed in claim 1, wherein the opening of the mould box is larger in size than the face opposite thereto.

6. The novel mechanical connecting device for precast piles according to claim 1, wherein the inner edges of the mould boxes are straight edges or arc edges.

7. The novel mechanical connecting device for the precast pile as claimed in any one of claims 1 to 6, wherein when the internal thread sleeve is embedded in the lower section of pile, the connecting rod is a bolt, and a nut is screwed into a die box for installation; and when the connecting rod in the lower pile section is an exposed bolt, a nut is screwed into the die box for installation.

8. The novel mechanical connecting device for the precast pile as claimed in claim 7, wherein the diameter of the distribution circle of the connecting rod is not less than the diameter of the distribution circle of the prestressed tendons in the upper and lower piles.

9. The novel mechanical connecting device for the precast pile is characterized in that the connecting rod is a high-strength bolt of 8.8 grade, 10.9 grade or 12.9 grade; the equal strength alternative form of 1 is taken with the prestressing tendons in the upper and lower section stake to the bolt, evenly arranges when prestressing tendons quantity is the even number, needs additionally to add a set of bolt when prestressing tendons is the odd number.

10. The novel mechanical connecting device for precast piles according to claim 7, wherein the mould box is filled and closed with concrete after the connecting rods are installed.