CN111827278A

CN111827278A - Prefabricated part connecting piece and concrete prefabricated part connecting structure

Info

Publication number: CN111827278A
Application number: CN201910330094.1A
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-10-27

Abstract

The invention discloses a prefabricated part connecting piece and a concrete prefabricated part connecting structure, wherein the connecting piece comprises a stop piece, a positioning clamping ring, a plug connector and an elastic component for supporting the positioning clamping ring; the plug connector comprises a connecting end and a plug end, and the plug end is provided with a necking part, an upper diameter-changing part and a lower diameter-changing part; the outer diameter of the upper diameter-changing part is gradually increased downwards along the axial direction, and the outer diameter of the lower diameter-changing part is gradually decreased downwards along the axial direction; the upper reducing part is provided with at least one circumferential annular groove which is inwards recessed from the outer surface of the upper reducing part to form; the inner wall of the positioning snap ring is provided with a contact part used for being tightly held on the outer surface of the upper diameter-changing part, and a supporting part formed at the lower end of the inner wall and used for being abutted to the inner part of the lower groove edge of the circumferential annular groove. The connecting piece can increase the resistance to pulling and reduce the moving distance of the plug connector, thereby reducing the gap between the two prefabricated pieces.

Description

Prefabricated part connecting piece and concrete prefabricated part connecting structure

Technical Field

The invention relates to the technical field of prefabricated parts, in particular to a connecting piece for connecting concrete prefabricated parts. The invention also relates to a connecting structure of concrete prefabricated parts connected through the connecting piece.

Background

When concrete prefabricated parts such as concrete prefabricated piles are connected, a connecting piece capable of being inserted can be used.

As shown in figure 1, the connecting piece comprises a plug assembly and a slot assembly, the plug assembly comprises a plug base fixed in a prefabricated member and a plug 1 ' extending out of the plug base, the slot assembly comprises a slot fixed in the prefabricated member and a stop member 2 ' fixedly connected with the opening of the slot, a spring 3 ' and a split type snap ring 4 ' are arranged in the slot, under the action of the elastic force of the spring 3 ', the snap ring 4 ' is supported at the stop part at the lower end of the stop member 2 ', the insertion end of the plug 1 ' is in a drum shape with two small ends and a large middle part, when the plug 1 ' passes through the stop member 2 ' and is inserted into the slot, the snap ring 4 ' is pushed to downwards move to overcome the elastic force of the spring 3 ' and radially expand the snap ring, after the maximum diameter part of the plug 1 ' passes through the snap ring 4 ', the snap ring 4 ' is reset upwards and radially folded under the action of the, thereby preventing the plug 1' from being pulled out of the socket and realizing quick connection.

The two precast piles connected by the connecting member have resistance to pulling in addition to resistance to compression, and the connecting member can achieve the expected effect in terms of compression, but when the connecting member is subjected to tensile force, the gap between the two precast piles is increased.

To this, can form the mechanism of preventing pulling out that constitutes by a plurality of sawtooth rings at snap ring 4' inner wall, the sawtooth ring actually forms the barb, through the frictional force that produces when sawtooth ring and plug toper surface relative slip, can prevent to a certain extent that the plug from breaking away from the snap ring, nevertheless because the plug position with sawtooth ring matched with is glossy surface, it is comparatively limited to lead to this kind to prevent pulling out the effect of mechanism in the aspect of reducing the space, two precast piles are connecting the back, still can appear great space.

As shown in figure 2, in order to reduce the gap generated when the plug is subjected to the tensile force, one or more than one ring of annular convex rings 5 'can be arranged on the conical inserting neck of the plug 1', the height of each annular convex ring is 0.1-0.5 mm, one or more than one ring of annular friction convex rings are arranged on the clamping surface of the split type clamping ring 4 ', the height of each annular friction convex ring is 0.1-0.5 mm, and the plug and the clamping ring are prevented from sliding relatively through the friction force generated between the annular convex rings 5' and the annular friction convex rings. However, the annular convex ring 5 ' and the annular friction convex ring need to be matched in a large area to form a friction pair, the bearing capacity of the convex ring is limited, the generated friction force is relatively small, the limiting capacity for resisting the relative sliding of the plug 1 ' and the snap ring 4 ' is weak, once the plug slides, the plug becomes invalid integrally, and the plug cannot slide step by step, so that a large gap between precast piles cannot be avoided.

Another way to reduce the clearance is shown in fig. 3, where the plug 1 'for a connector is provided with an inwardly recessed recess between the mating end and the connecting end, the outer wall of the mating end being provided with at least one collar 6' projecting out of the recess, so that the outer wall of the recess is stepped. Therefore, the inner wall of the clamping ring 4 'can be abutted against the step of the clamping ring 6' through the sawtooth ring, and the anti-skid purpose is achieved.

However, the anti-pulling mechanism has the problems that on one hand, the anti-pulling mechanism mainly depends on the fact that a certain sawtooth ring on the inner wall of the clamping ring is abutted with the step to prevent slipping, the structural strength of the sawtooth ring is limited, the possibility of slipping still exists after the sawtooth ring and the step are abutted, and the sufficient connection reliability cannot be guaranteed; on the other hand, in order to ensure that the sawtooth ring can be abutted against the steps, the steps of the sawtooth ring must be designed to be in a mode of protruding out of the concave part, namely, the steps of each stage on the conical insertion neck of the sawtooth ring need to protrude out of the surface of the concave part, if the insertion head is machined on a lathe in a cutting mode, metal materials in a large area above each step need to be cut in order to form the protruding steps, the cutting amount is large, the cutting time is long, the loss of a cutting tool is large, and the sawtooth ring is not only large in machining difficulty and low in production efficiency, but also high in manufacturing cost; on the other hand, in order to form the outwardly protruding steps, the diameter of the tapered collar above each step is inevitably reduced, which affects the structural strength of the socket end and the stability after connection.

Disclosure of Invention

Based on the research on the anti-pulling mechanisms of the connecting pieces, the invention provides the connecting piece which can increase the anti-pulling performance between the connecting pieces, reduce the moving distance of the plug connector and further reduce the gap between two prefabricated pieces.

Another object of the present invention is to provide a connecting structure of concrete prefabricated parts connected by the connecting member.

In order to achieve the purpose, the invention provides a prefabricated part connecting piece which comprises a stop piece, a split type positioning clamping ring, a plug-in connector capable of being clamped in the positioning clamping ring and an elastic component for supporting the positioning clamping ring; the plug connector comprises a connecting end and a plug end which are integrally formed, and the plug end is provided with a necking part, an upper diameter-changing part and a lower diameter-changing part; the outer diameter of the upper diameter-changing part is gradually increased downwards along the axial direction, and the outer diameter of the lower diameter-changing part is gradually decreased downwards along the axial direction; the upper reducing part is provided with at least one circumferential annular groove which is inwards recessed from the outer surface of the upper reducing part to form; the inner wall of the positioning snap ring is provided with a contact part which can be tightly held on the outer surface of the upper diameter-changing part, and a supporting part which is formed at the lower end of the inner wall and is used for abutting against the inner part of the lower groove edge of the circumferential annular groove.

Preferably, the support portion is a ridge portion formed between an inner wall at the lower end of the positioning snap ring and the lower end surface of the inner wall.

Preferably, the included angle of the edge part on the longitudinal section is an acute angle, a right angle or an obtuse angle less than or equal to 120 degrees.

Preferably, the outer surface of the upper diameter-changing part is provided with two or more circumferential annular grooves; when the positioning snap ring is at the upper limit position relative to the plug connector, the supporting part of the positioning snap ring is abutted against the inner side part of the lower groove edge of the first circumferential annular groove at the top.

Preferably, the distance between the lower groove edge of the last circumferential groove located at the lowermost position and the lower groove edge of the first circumferential groove located at the uppermost position is less than or equal to C +5mm, where C is a standard clearance error value of the prefabricated part.

Preferably, the center of the end face of the connecting end is provided with a first positioning part which is used for matching and positioning in the process of preparing the plug-in connector so as to enable the axes of the connecting end and the plug-in end of the plug-in connector to coincide; and/or

The center of the end face of the plug end is provided with a second positioning part which is used for matching and positioning in the process of preparing the plug so as to enable the axis of the connecting end of the plug and the axis of the plug end to coincide.

Preferably, the first positioning portion is a first positioning hole formed by inward recessing along the center of the end face of the connecting end or a first positioning column formed by outward protruding along the center of the end face of the connecting end; and/or

The second positioning part is a second positioning hole formed by inwards sinking along the center of the end face of the inserting end or a second positioning column formed by outwards bulging along the center of the end face of the inserting end.

Preferably, the inner wall of the positioning snap ring is provided with a plurality of sawtooth rings forming the contact part.

Preferably, the circumferential annular groove is in a shape of a circular arc, a trapezoid or a triangle, one side of which is open and the opening of which faces outward, in the longitudinal section.

Preferably, the supporting portion protrudes from the contact portion.

In order to achieve the other purpose, the invention provides a concrete prefabricated part connecting structure, which comprises a first prefabricated part and a second prefabricated part, wherein the first prefabricated part and the second prefabricated part are connected through a connecting piece, the connecting piece is the prefabricated part connecting piece, a plug connector of the prefabricated part connecting piece is arranged on the first prefabricated part, and an elastic part, a positioning clamping ring and a stop part of the prefabricated part connecting piece are arranged on the second prefabricated part.

The prefabricated part connecting piece further improves the anti-pulling mechanism between the plug connector and the positioning snap ring, after improvement, an inward concave circumferential annular groove is formed on the outer surface of the upper diameter-changing part of the plug connector, and a supporting part is formed at the lower end of the inner wall of the positioning snap ring. Therefore, under the dual functions of clamping and holding, the plug connector can be prevented from sliding outwards relative to the positioning snap ring, so that the pulling resistance between the connecting pieces is improved, and gaps generated during connection of the connecting pieces are reduced.

The connecting structure of the concrete prefabricated part provided by the invention is provided with the prefabricated part connecting piece, and the connecting structure of the concrete prefabricated part provided with the prefabricated part connecting piece also has corresponding technical effects due to the technical effects of the prefabricated part connecting piece.

Drawings

FIG. 1 is a schematic diagram of a typical prefabricated component connection;

FIG. 2 is a schematic view of the insertion end of the prefabricated part connecting piece and the clamping ring forming a friction type anti-pulling mechanism through the annular convex ring;

FIG. 3 is a schematic view of the insertion end of the prefabricated component connecting piece forming an anti-pulling mechanism with the snap ring through a step protruding from the outer surface;

FIG. 4 is a schematic structural diagram of a prefabricated part connecting piece according to the first embodiment of the present invention;

FIG. 5 is a schematic structural view of the connector of FIG. 4;

fig. 6 is a bottom view of the plug of fig. 5;

FIG. 7 is a schematic longitudinal cross-sectional view of the retaining collar shown in FIG. 4;

FIG. 8 is a schematic illustration of the plugging process of the prefabricated element connectors shown in FIG. 4;

FIG. 9 is a schematic view of the positioning snap ring of the prefabricated component connecting piece shown in FIG. 4 abutting against the first circumferential groove of the plug connector;

FIG. 10 is a schematic structural view of the positioning snap ring of the prefabricated component connecting piece shown in FIG. 4 abutting against the second circumferential annular groove of the plug;

fig. 11 is a schematic structural diagram of a plug connector of a prefabricated part connecting piece according to a second embodiment of the invention;

fig. 12 is a schematic structural diagram of a plug connector of a prefabricated part connecting piece according to a third embodiment of the invention;

fig. 13 is a schematic structural diagram of a plug connector of a prefabricated part connecting piece according to a fourth embodiment of the invention.

In fig. 1 to 3:

plug-1 'stopper-2' spring-3 'snap ring-4' annular convex ring-5 'collar-6'

In fig. 4 to 13:

1. the plug 10, the connection end 11, the connection part 111, the external thread 12, the positioning part 13, the matching part 14, the first positioning part 141, the first positioning hole 141A, the first positioning post 20, the plug end 21, the necking part 22, the upper diameter changing part 221, the circumferential annular groove 23, the lower diameter changing part 24, the second positioning part 241, the second positioning hole 241A, the second positioning post 50, the positioning snap ring 60, the middle nut 70, the spring 80, the sleeve nut 90, the support part 100, the sawtooth ring 50

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In this specification, terms such as "upper, lower, inner, and outer" are established based on positional relationships shown in the drawings, and the corresponding positional relationships may vary depending on the drawings, and therefore, the terms are not to be construed as absolutely limiting the scope of protection; moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

Referring to fig. 4 to 7, fig. 4 is a schematic structural view of a prefabricated member connecting piece according to a first embodiment of the present invention; FIG. 5 is a schematic structural view of the connector of FIG. 4; fig. 6 is a bottom view of the plug of fig. 5.

As shown in the drawings, in the first embodiment, the prefabricated part connecting member is provided, which is mainly composed of the middle nut 60 as a stopper, the split type positioning snap ring 50, the connector 1 capable of being snapped to the positioning snap ring 50, and the spring 70 supporting the positioning snap ring 50, and the split type snap ring 50 has a plurality of snap pieces for split, for example, four, five or six, which may be a completely separated structure or a structure in which the upper portions are separated from each other and the bottom portions are connected.

The plug 1 comprises a connecting end 10 and a plug end 20, the connecting end 10 and the plug end 20 are integrally formed, the connecting end 10 is provided with an external thread 111, and the plug end 20 is provided with a necking part 21, an upper diameter-changing part 22 and a lower diameter-changing part 23; necking portion 21 forms and connects between 10 and the last reducing portion 22, the external diameter of going up reducing portion 22 is crescent along the axial direction downwards, it is little to form the upper end external diameter, the big circular cone frustum shape joint position of lower extreme external diameter, the surface of going up reducing portion 22 has upper and lower twice circumference ring channel 221 that indent and then formed, two circumference ring channel 221 are along axial interval distribution at the surface of going up reducing portion 22, accessible car processing or other machining mode machine-shaping on bayonet joint 1, have multichannel serration ring 100 on the inner wall of location snap ring 50, form and be used for embracing tightly the contact site on the surface of last reducing portion 22, location snap ring 50 is formed with supporting part 90 in the lower extreme department of inner wall.

The edge portion that the supporting part 90 formed between the lower terminal surface of the inner wall and the inner wall for location snap ring 50 lower extreme department, the lower groove limit diameter of circumference ring channel 221 is greater than the diameter of its upper groove limit, and the diameter less than or equal to of the deepest of circumference ring channel 221 is the diameter of its upper groove limit, the supporting part 90 can butt in the inboard position on the lower groove limit of circumference ring channel 221 when bayonet joint 1 and location snap ring 50 relative slip, thereby prevent that bayonet joint 1 from receiving to fix a position snap ring 50 along the outer peripheral face relative slip of last reducing portion 22 under the effect of upward pulling force.

The lower diameter-changing portion 23 and the upper diameter-changing portion 22 are integrally formed, a small constant diameter portion may be provided therebetween, the outer diameter of the lower diameter-changing portion 23 is gradually decreased downward along the axial direction to form an insertion end, and the lower diameter-changing portion 23 is shown in a spherical segment shape having a flattened lower end surface.

Specifically, the circumferential annular groove 221 is in the shape of a circular arc with an opening on one side facing outward in the longitudinal section, the width value may be 0.1mm to 3mm, and further may be 0.2mm to 0.5mm, and the included angle of the support portion 90 on the longitudinal section is an acute angle, so as to more reliably abut against the circumferential annular groove 221. In addition, the circumferential annular groove 221 may have a trapezoidal or triangular shape with an opening on one side and an opening facing outward in the longitudinal section, and the circumferential annular groove 221 with a trapezoidal or triangular section, for example, the circumferential annular groove 221 with a right trapezoid or right triangle section, may have a horizontal supporting surface on the inner side portion of the lower groove side, compared to the circumferential annular groove 221 with an arc shape, so as to form a surface-to-surface contact structure with the lower surface of the supporting portion 90 of the positioning snap ring 50, and may bear a large axial force, and for better contact, an included angle of the supporting portion 90 in the longitudinal section may be an acute angle or an obtuse angle less than or equal to 120 °.

The connection end 10 includes a connection portion 11 formed at one end of the connection end 10 and a fitting portion 13 formed at the other end of the connection end 10, the connection portion 11 has an external thread 111 thereon, wherein the external thread 111 may be formed by thread rolling and may be detachably coupled to the prefabricated member, the fitting portion 13 integrally extends from the connection portion 11, and an outer diameter thereof becomes gradually smaller from one end of the connection portion 11 in a direction away from the connection portion 11 to better fit and fit the middle nut 60 in the connection member. In other words, the fitting portion 13 has an inverted truncated cone shape with a large outer diameter at the upper end and a small outer diameter at the lower end, and is disposed between the connecting portion 11 and the constricted portion 21, wherein the one end of the constricted portion 21 and the fitting portion 13 smoothly transition.

The connection end 10 further comprises a positioning portion 12, the positioning portion 12 is integrally formed between the connection portion 11 and the matching portion 13 and protrudes from the matching portion 13 in the radial direction, wherein the positioning portion 12 is used for adapting to an installation tool to install the plug in the prefabricated component, the position where the positioning portion 12 is arranged depends on the length of the connection portion 11, so as to ensure that the external thread 111 of the connection portion 11 is installed in place and ensure that the plug end 20 of the plug can be clamped in the positioning clamping ring 50. In addition, in order to facilitate the fitting of the positioning portion 12 to the installation tool or the intermediate nut 60, the cross section of the positioning portion 12 has a regular polygonal structure, for example, the cross section of the positioning portion 12 has a nonagon or an undegon. Here, the radial protrusion of the positioning portion 12 means that the maximum outer diameter of the positioning portion 12 is larger than the maximum outer diameter of the fitting portion 13.

As shown in fig. 7, in at least one embodiment, the height of the supporting portion 90 may be higher than the inner surface of the contact portion, that is, the supporting portion 90 protrudes from the contact portion, and there is a height difference H between the supporting portion 90 and the surface where the tooth crest of the sawtooth ring 100 is located, so that when the plug 1 and the retainer ring 50 slide relatively, the supporting portion can more easily abut against the inner portion of the lower groove edge of the circumferential annular groove 221, and the contact area of the abutting contact is increased, thereby improving the anti-pulling performance.

Referring to fig. 8, fig. 8 is a schematic diagram illustrating a plugging process of the prefabricated part connector shown in fig. 4.

As shown in the figure, the spring 70, the spring washer, the positioning snap ring 50 and the middle nut 60 of the prefabricated part connecting piece are sequentially installed in a sleeve nut 80, the sleeve nut 80 can be pre-embedded in a concrete prefabricated part (such as a concrete prefabricated pile) and connected with a stress rib in the concrete prefabricated part, under the elastic force of the spring 70, the positioning snap ring 50 is supported on an inner conical surface of the lower end of the middle nut 80, the plug-in connector 1 is connected with another concrete prefabricated part (another concrete prefabricated pile), when the connection is performed, the plug-in end 20 of the plug-in connector 1 is inserted into the middle nut 60, so that the lower diameter part 23 of the plug-in end 20 is contacted with and penetrates through the positioning snap ring 50, the positioning snap ring 50 is pushed to move downwards to overcome the elastic force of the spring 70 and simultaneously radially expand the positioning snap ring 50, as the plug-in end 20 continues downwards, after the position with the maximum, the positioning snap ring 50 is reset upward and radially folded under the elastic force of the spring 70, and a necking part is formed at the lower end of the middle nut 60, so that the upper reducing part 22 of the insertion end 20 and the positioning snap ring 50 are in butt fit, thereby preventing the insertion head 1 from being pulled out from the sleeve nut 80 and realizing quick connection.

Referring to fig. 9 and 10, fig. 9 is a schematic structural view illustrating the positioning snap ring of the prefabricated part connecting piece shown in fig. 4 abutting against the first circumferential annular groove of the plug; fig. 10 is a schematic structural view of the positioning snap ring of the prefabricated part connecting piece shown in fig. 4 abutting against the second circumferential annular groove of the plug.

When the plug 1 is pulled upwards, it tends to slide upwards, and the positioning snap ring 50 tends to slide downwards, and the support portion 90 at the lower end of the positioning snap ring 50 will abut against the circumferential annular groove 221 on the outer circumferential surface of the upper diameter-changing portion 22, so as to prevent the positioning snap ring 50 from continuously sliding relative to the upper diameter-changing portion 22.

On the other hand, even if the positioning snap ring 50 slips from one of the circumferential annular grooves 221, in the continuous sliding process, the positioning snap ring 50 is clamped into the next circumferential annular groove 221, and the circumferential annular groove 221 can form a multi-stage tensile structure which is abutted and fixed with the positioning snap ring 50, so that the gap generated when the prefabricated members are connected by the connecting piece is reduced, namely the pulling resistance between the upper reducing part 22 of the plug-in connector and the positioning snap ring 50 can be obviously improved, the moving distance of the plug-in connector is reduced, the gap between the two prefabricated members is reduced, and the connection between the two prefabricated members is firmer and more stable.

Specifically, when the connecting member is used for a concrete precast pile, axial acting force is generally borne during pile sinking, during use after pile sinking, and during uplift detection or experiments.

In the pile sinking process, two prefabricated parts (such as precast piles) are connected axially through the connecting piece in the embodiment, then a pile driver is needed to apply downward force to the prefabricated member positioned above to realize that the connected prefabricated member moves downwards in the soil body, after the downward force applied by the pile driver has disappeared, the preform will have an upward rebound, namely, an upward impact force to the connected prefabricated parts can be formed on the contact surface of the end surface of the prefabricated part below and the soil body in the piling process of the pile driver, the impact force can be transmitted to the prefabricated member above, and because the soil layers are different, the frictional resistance of the soil layers on the side surfaces of the upper prefabricated member and the lower prefabricated member is different, so that the upward movement distances of the upper prefabricated member and the lower prefabricated member are different in the rebounding process, this results in the connection being subjected to an axial tensile force, so that the upper diameter-changing portion 22 of the plug 1 is subjected to an upward force.

In the use, like the concrete precast pile of basement below, because the weight of basement itself is lighter, the volume is great, groundwater can have a buoyancy to the basement, on this buoyancy can apply the concrete precast pile be connected with the basement, and then has a power that lasts upwards to the concrete precast pile, connecting piece between traditional stake can produce when receiving this power and slide, and then has increased the clearance between the stake.

In the process, the positioning snap ring 50 is abutted to the circumferential annular groove 221 to prevent the plug connector from continuously moving upwards, the circumferential annular grooves 221 distributed at intervals up and down in multiple ways can realize the multi-section anti-pulling function, the plug connector is reduced to the maximum extent to continuously move upwards, and then the gap between two prefabricated components is reduced.

In addition, when two pile bodies have errors in the axial alignment process, the upper reducing part 22 of the insertion part is inserted into the middle nut 60 to be inclined at a certain angle, at this time, the plurality of clamping pieces of the positioning clamping ring 50 are clamped to the outer peripheral surface of the upper reducing part 22 non-uniformly, but because the supporting part 90 or the sawtooth ring 100 of each clamping piece of the positioning clamping ring 50 can be clamped in the circumferential annular groove 221 of the outer peripheral surface of the upper reducing part 22, even when the upper reducing part 22 is subjected to upward tension, each clamping piece of the positioning clamping ring 50 can be clamped in the circumferential annular groove 221, the movable distance of the insertion joint 1 is reduced, the gap between two prefabricated parts is reduced, and the connection between the two prefabricated parts is firmer and more stable.

The position of the circumferential annular groove 221 on the outer surface of the upper diameter-changing portion 22 is such that when the positioning snap ring 50 is located at the upper limit position relative to the plug connector 1, the supporting portion 90 thereof abuts against the inner side portion of the lower groove edge of the uppermost first circumferential annular groove 221, and the distance between the lower groove edge of the lowermost last circumferential annular groove 221 and the lower groove edge of the uppermost first circumferential annular groove 221 is less than or equal to C +5mm, wherein C is the standard clearance error value of the prefabricated component. For the concrete precast pile, C is 1% D +1mm, wherein D is the diameter of concrete precast pile, and D is the diameter of circular precast pile if circular precast pile, and D is the circumscribed circle diameter of square precast pile if square precast pile. Thus, when the positioning snap ring 50 is clamped in the first circumferential annular groove 221, the gap between the upper pile and the lower pile is 0, and when the positioning snap ring 50 is clamped in the last circumferential annular groove 221, the gap between the upper pile and the lower pile is smaller than or equal to the maximum allowable error range.

When the number of circumferential annular grooves 221 is greater than two, for example, three, the distance between two adjacent circumferential annular grooves 221 may be equal or unequal, and may be set as required, and when the total axial length of the N circumferential annular grooves 221 should ensure that the maximum error of the national standard exists between the pile end faces, the plug 1 may still form an effective joint with the positioning snap ring 50.

After the structure is adopted, when the plug connector 1 slides outwards relative to the positioning snap ring 50 under the action of axial tension, the contact part of the positioning snap ring 50 with the sawtooth ring 100 can be tightly held on the outer surface of the upper diameter-changing part 22 and can generate elastic or plastic deformation, and the supporting part 90 can abut against the inner part of the lower groove edge of the circumferential annular groove 221, so that the positioning snap ring 50 is connected with the plug connector 1 in a clamping way. Therefore, under the dual functions of clamping and holding, the plug connector 1 can be prevented from sliding outwards relative to the positioning snap ring 50, so that the anti-pulling performance of the connecting piece is improved, and the gap generated when the connecting piece is connected is reduced.

Compared with an anti-pulling structure formed by a sawtooth ring 100 and a protruding step, the supporting portion 90 has higher structural strength and can bear larger axial acting force, so that the anti-pulling performance is better, in addition, the processing difficulty and the manufacturing cost of the circumferential annular groove 221 are lower, the production efficiency can be obviously improved, in addition, the diameter of the circumferential annular groove 221 cannot be reduced due to the processing of the circumferential annular groove 221, and the larger diameter can enable the connection to be firmer.

Referring to fig. 11, 12 and 13, fig. 11 is a schematic structural diagram of a plug connector of a prefabricated part connector according to a second embodiment of the present invention; fig. 12 is a schematic structural diagram of a plug connector of a prefabricated part connecting piece according to a third embodiment of the invention; fig. 13 is a schematic structural diagram of a plug connector of a prefabricated part connecting piece according to a fourth embodiment of the invention.

The inventor has found that, for the connector, the machining precision of the connection end 10 and the plug end 20 of the plug 1 in the axial direction also affects the assembly precision of the connector, and when the connection end 10 and the plug end 20 are not on the same axis in the axial direction, even if the mouths of the plug 1 and the collet nut 80 are aligned, the plug 1 is obliquely inserted into the collet nut 80. That is to say, when the connection end 10 and the insertion end 20 of the plug 1 are inclined, even if the two piles are aligned, the insertion end 20 of the plug 1 is also obliquely inserted into the sleeve nut 80, so that each card of the positioning snap ring 50 cannot be uniformly clamped on the outer peripheral surface of the insertion end 20, that is, one card of the positioning snap ring 50 is excessively tightly clamped on the insertion end 20, the peripheral surface of the insertion end may be damaged when the pulling force is applied, and other cards are excessively loosely clamped on the insertion end 20 and may directly slide to the bottom of the insertion end 20, which undoubtedly reduces the tensile strength between the connection members and increases the gap between the two prefabricated members.

To this end, the first positioning portion 14 may be disposed at the central position of the end face of the connecting end portion 10, wherein the first positioning portion 14 is used for being positioned in cooperation with a processing device in the process of manufacturing the plug, so that the axis of the connecting end 10 coincides with the axis of the plug end 20, and the plug end 20 is prevented from being inclined relative to the connecting end 10, and the plug end 20 and the positioning snap ring 50 cannot be clamped uniformly.

Further, in the process of manufacturing the inserting end 20 of the inserting head, when the connecting end 10 needs to be fixed first and then the inserting end 20 needs to be turned, it is difficult to ensure that the axis of the whole inserting head is overlapped with respect to the axis of the turning device in the conventional fixing manner of the connecting end 10 by the grabbing clamp, which may cause the inserting end 20 of the inserting head 1 to be inclined with respect to the connecting end 10. Therefore, in at least one embodiment, the first positioning portion 14 of the connecting end portion 10 is cooperatively positioned, that is, in addition to fixing the connecting end portion 10 in a clamping manner, the turning device is fixedly connected to the first positioning portion 14 along the axis direction of the connecting end portion 10, so that the axis of the plug 1 and the axis of the turning device are kept coincident, the coincidence of the central axis of the connecting end portion 10 of the manufactured plug 1 and the central axis of the plug end 20 is ensured, the plug 1 itself is ensured not to be inclined, the positioning snap ring 50 can be uniformly clamped on the outer circumferential surface of the plug end 20 of the plug 1, the two prefabricated components with the connecting piece are stably connected, the pulling resistance between the two prefabricated components is increased, and the gap generated under the action of pulling force between the two prefabricated components is reduced. In some embodiments, the first positioning portion 14 may be implemented as a first positioning hole 141 formed by being recessed inwards along the center of the end surface of the connecting end portion 10, wherein the positioning hole 141 can be fixed by a turning device to ensure that the prepared and molded plug 1 is not inclined, so as to improve the yield of the plug 1. Preferably, the cross section of the first positioning hole 141 may be configured to be hexagonal, so as to facilitate disassembly during the anti-pulling test of the plug 1.

In other embodiments, the first positioning portion 14 may be implemented as a first positioning column 141A protruding outward along the center of the end surface of the connecting end portion 10, wherein the first positioning column 141A can be fixed by a turning device to ensure that the prepared and formed plug 1 does not tilt, so as to improve the yield of the plug 1. Preferably, the cross section of the first positioning column 141A may be configured to be hexagonal, so as to facilitate disassembly during a pullout test of the plug. The center of the end face of the lower diameter-changing portion 23 may further have a second positioning portion 24, wherein an axis of the second positioning portion 24 coincides with an axis of the first positioning portion 14, and the second positioning portion is used for making an axis of the connection end 10 coincide with an axis of the plug end 20 in a process of manufacturing the plug, so as to better ensure that the plug 1 does not tilt. Accordingly, the second positioning portion 24 may be implemented as a second positioning hole 241 formed along the center of the end surface of the lower diameter-changing portion 23 and recessed inwards to match with a turning device for fixing, so as to ensure that the prepared and formed plug connector is not inclined. In particular, when the first positioning portion 14 and the second positioning portion 24 at the two ends of the plug 1 are fixed at the same time, it is further ensured that the axis of the connecting end 10 and the axis of the plug end 20 coincide during the process of manufacturing the plug. The second positioning portion 24 can be implemented as a second positioning column 241A protruding outwards along the center of the end face of the insertion portion 23 to cooperate with a turning device for fixing, so as to ensure that the prepared and formed plug connector does not tilt.

The specific embodiments of the first positioning portion 14 and the second positioning portion 24 can be freely combined, for example, the first positioning hole 141 of the first positioning portion 14 can be combined with the second positioning hole 241 of the second positioning portion 24 or the second positioning post 241A of the second positioning portion 24 to facilitate fixing two ends of the plug at the same time, as shown in the figure; the first positioning hole 141A of the first positioning portion 14 may be matched with the second positioning hole 241 of the second positioning portion 24 or the second positioning post 241A of the second positioning portion 24 to be combined, so as to fix two ends of the plug at the same time, as shown in the figure, the positioning manner formed by combining them is not described again.

In addition to the prefabricated part connecting piece, the invention also provides a concrete prefabricated part connecting structure, which comprises a first prefabricated part and a second prefabricated part which are connected, wherein the first prefabricated part and the second prefabricated part are connected through the prefabricated part connecting piece, the plug-in connector 1 of the prefabricated part connecting piece is arranged on the first prefabricated part, the plug-in connector 1 can be detachably connected with the first prefabricated part through an external thread 111, the spring 70, the positioning snap ring 50 and the middle nut 60 of the prefabricated part connecting piece are arranged in the plug-in groove (such as a sleeve nut) of the second prefabricated part, and the two prefabricated parts with the connecting piece are firmly connected through the clamping fit between the upper reducing part 22 of the plug-in connector 1 of the connecting piece and the positioning snap ring 50 in the plug-in groove.

Specifically, the connecting structure may be a connecting structure of a concrete precast pile or a concrete precast pile cap or a concrete precast slab or a concrete precast wall or a concrete precast column or a concrete precast beam or a concrete precast balcony or a concrete precast bay window or a concrete precast stair or a concrete precast elevator shaft or a concrete precast roof or a concrete precast terrace.

The prefabricated part connecting piece and the concrete prefabricated part connecting structure provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The prefabricated part connecting piece comprises a stop piece, a split type positioning clamping ring, a plug-in connector capable of being clamped in the positioning clamping ring and an elastic component for supporting the positioning clamping ring; the plug connector comprises a connecting end and a plug end which are integrally formed, and the plug end is provided with a necking part, an upper diameter-changing part and a lower diameter-changing part; the outer diameter of the upper diameter-changing part is gradually increased downwards along the axial direction, and the outer diameter of the lower diameter-changing part is gradually decreased downwards along the axial direction; the upper diameter-changing part is provided with at least one circumferential annular groove which is inwards concave from the outer surface of the upper diameter-changing part; the inner wall of the positioning snap ring is provided with a contact part which can be tightly held on the outer surface of the upper diameter-changing part, and a supporting part which is formed at the lower end of the inner wall and is used for abutting against the inner part of the lower groove edge of the circumferential annular groove.

2. The prefabricated part connecting member according to claim 1, wherein the supporting portion is a rim portion formed between an inner wall at a lower end of the retainer ring and a lower end surface of the inner wall.

3. The prefabricated member connecting piece according to claim 2, wherein the included angle of the edge portions in the longitudinal section is an acute angle, a right angle or an obtuse angle of 120 ° or less.

4. The prefabricated member connecting piece according to claim 1, wherein two or more circumferential annular grooves are formed on an outer surface of the upper diameter-changing portion; when the positioning snap ring is at the upper limit position relative to the plug connector, the supporting part of the positioning snap ring is abutted against the inner side part of the lower groove edge of the first circumferential annular groove at the top.

5. The prefabricated component connecting piece according to claim 4, wherein a distance between a lower groove edge of the last circumferential groove located at the lowermost position and a lower groove edge of the first circumferential groove located at the uppermost position is less than or equal to C +5mm, wherein C is a standard clearance error value of the prefabricated component.

6. The prefabricated part connecting piece according to claim 1, wherein the end face center of the connecting end has a first positioning portion for fitting positioning during preparation of the plug-in connector so that axes of the connecting end and the plug-in end of the plug-in connector coincide; and/or

7. The prefabricated part connecting member according to claim 6, wherein the first positioning portion is a first positioning hole formed to be inwardly depressed along a center of the end surface of the connecting end or a first positioning post formed to be outwardly raised along a center of the end surface of the connecting end; and/or

8. The prefabricated part connecting member according to claim 1, wherein the positioning snap ring has a plurality of zigzag rings on an inner wall thereof, the zigzag rings forming the contact portion.

9. The prefabricated member connecting member according to claim 1, wherein the circumferential annular groove has a circular arc shape, a trapezoidal shape or a triangular shape in longitudinal section, the circular arc shape having an opening at one side and the opening facing outward.

10. The prefabricated element connector according to any one of claims 1 to 9, wherein the supporting portion protrudes from the contact portion.

11. A concrete prefabricated part connecting structure, which comprises a first prefabricated part and a second prefabricated part, wherein the first prefabricated part and the second prefabricated part are connected through a connecting piece, the connecting piece is the prefabricated part connecting piece of any one of the claims 1 to 10, a plug connector of the prefabricated part connecting piece is arranged on the first prefabricated part, and an elastic part, a positioning clamping ring and a stop part of the prefabricated part connecting piece are arranged on the second prefabricated part.