A plug-in stop structure and prefabricated component combination

Abstract

The present invention discloses a plug-in stop structure and a prefabricated component combination, wherein the plug-in stop structure comprises an outer sleeve, an insert rod, an annular retainer and a guide ring, wherein the outer sleeve has an accommodating cavity, an axial end of the insert rod forms a reducer plug joint that can be inserted into the accommodating cavity, the annular retainer is sleeved on the periphery of the reducer plug joint and is sealed in the accommodating cavity by the guide ring, and the annular retainer is provided with two or more notches at intervals along the circumferential direction at one end portion close to the guide ring, and an arc-shaped clamping block with an outer circumferential width greater than an inner circumferential width is accommodated in the notch for reverse clamping of the reducer plug joint; the inner width of the notch is smaller than the outer width of the arc-shaped clamping block and larger than the inner width of the arc-shaped clamping block so that the arc-shaped clamping block can move axially and / or radially along the annular retainer. The plug-in stop structure can prevent the card and spring from falling or tipping over, can ensure the plug-in success rate and the anti-pullout stop effect, and has better connection convenience and connection strength.

Description

Technical Field

[0001] The invention belongs to the technical field of construction, and in particular relates to a plug-in anti-retraction structure and a prefabricated component combination. Background Art

[0002] Precast concrete piles are widely used pile foundation materials in the construction industry. Due to production and transportation conditions, the length of a single section of a precast concrete pile is often less than the design length requirement of the precast concrete pile. Therefore, in the actual construction process, multiple precast concrete piles need to be axially connected together to achieve the overall length required by the design. The traditional connection method of precast concrete piles is generally to align the end plates of the upper and lower sections of the precast concrete piles and weld them together. The specific method is to align the end plates of the upper and lower sections of the pipe piles, adjust the verticality, and then connect them by electric welding. This connection method is greatly affected by human factors and meteorological factors, and because of the high requirements for the verticality and connection quality of the pipe piles, the construction difficulty and construction cost are high. In addition, this welding method does not connect the steel bars in the upper and lower pipe piles, so the stress transfer effect between the upper and lower pipe piles is not strong, resulting in the connection strength between the upper and lower sections of the precast concrete piles being less than ideal.

[0003] In view of the above-mentioned traditional precast concrete pile connection method of end plate alignment welding, the applicant previously provided a strong pull buckle structure, such as Fig.18 As shown, the strong pull buckle structure includes an intermediate nut 301 and an insertion rod 302 inserted into the intermediate nut 301. The end of the intermediate nut 301 has a collar composed of a plurality of cards 303. When the insertion rod 302 is inserted into the intermediate nut 301, the collar can clamp the insertion rod 302 so that the insertion rod 301 and the intermediate nut 302 are engaged with each other. The card 303 has at least one clamping tooth inside, and the insertion rod 302 has at least one tensioning step 3022 on the top. The tensioning step 3022 can be engaged with the clamping tooth to form a step-shaped buckle structure. The reducer plug connector 3021 of the insertion rod 302 has a recessed portion 3023 that matches the shape of the collar, and the tensioning step 3022 is located on the outer wall of the recessed portion 3023. The tensioning step 3022 is annular, and the clamping teeth on the plurality of cards 303 are enclosed to form an annular structure.

[0004] Compared with the traditional welding type precast pile connection method, the above-mentioned strong pull buckle structure eliminates the connection end plate at the end of the pile, and thus has the advantages of less metal consumption, fast docking construction speed, and high connection strength. However, the disadvantage is that before the above-mentioned strong pull buckle structure is plugged in, the plug rod 302 is usually installed in the nut sleeve 306 at one end of the upper pile, and the middle nut 301, support ring 304, card 303, elastic member 305 and other components are installed in the nut sleeve 306 at one end of the lower pile. Since the precast concrete pile inevitably has a certain amount of pile end face inclination and / or nut sleeve positioning error and / or the upper and lower precast concrete piles are not aligned axially, therefore, in order to ensure that the multiple strong pull buckle structures between the upper and lower precast concrete piles can complete the plug-in action, A sufficiently large radial clearance must be left between the inner hole 3011 of the middle nut 301 and the middle section 3021 of the rod 302 to adjust the above-mentioned error. This cannot avoid the situation where the center axis of the rod 302 is tilted or offset relative to the center axis of the middle nut in the early stage of contacting the card 303. In this case, the reducer 3021 will knock over some of the cards 303 on the support ring 304, so only a part of the cards 303 can play the role of reversely stopping the rod 302, resulting in the connection strength of the upper and lower sections of the precast concrete piles failing to meet the design standard requirements. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a plug-in anti-retraction structure to solve the problem that the plug-in rod of the existing mechanical joints for precast concrete components is easy to knock down the card during assembly, resulting in plug-in failure, thereby ensuring the success rate of plug-in and the connection strength.

[0006] To achieve the above-mentioned purpose, the present invention provides a plug-in stop structure, comprising: an outer sleeve having an accommodating cavity; an insert rod, one axial end of which forms a reducer plug connector that can be inserted into the accommodating cavity; and an annular retainer, which is sleeved on the periphery of the reducer plug connector and is sealed in the accommodating cavity by a guide ring;

[0007] The annular retainer has two or more notches spaced apart in the circumferential direction at one end portion close to the guide ring, and the notches contain arc-shaped clamping blocks with an outer circumference width greater than an inner circumference width for reverse clamping the reducer plug connector;

[0008] The inner width of the notch is smaller than the outer width of the arc-shaped clamping block and larger than the inner width of the arc-shaped clamping block so that the arc-shaped clamping block can move along the axial direction and / or radial direction of the annular retainer.

[0009] Preferably, the annular retaining frame has a built-in elastic element, one end of the elastic element extends into the notch and pushes the arc-shaped clamping block toward the guide ring.

[0010] Preferably, the annular retaining frame is provided with a guide groove or a guide hole at the bottom of the notch which can partially accommodate the elastic element.

[0011] Preferably, the elastic element is composed of a support plate and elastic legs integrally formed with both side ends of the support plate, and the elastic legs include at least one bending section and / or arc section.

[0012] Preferably, in the radial direction away from the central axis of the annular retainer, the two side walls of the notch are in an outward-facing "X" shape;

[0013] And / or in the axial direction of the annular retainer, the two side walls of the notch are in an outward-facing "X" shape.

[0014] Preferably, in the radial direction away from the central axis of the annular retainer, the two side walls of the notch are in an outward-facing "X" shape;

[0015] In the direction from the notch bottom to the notch top, the notch has at least one notch width maintaining section and at least one notch width increasing section.

[0016] Preferably, the peripheral surface of one end of the annular retainer close to the guide ring is an outer conical surface;

[0017] And / or, the difference between the radius of the inner peripheral wall of the outer sleeve and the radius of the outer peripheral wall of the annular retainer is smaller than the radial thickness of the bottom of the arc-shaped clamping block.

[0018] Preferably, it also includes: a screw-on body screwed to fix the other end of the plug rod;

[0019] A chamfer or rounded corner is formed between one or both circumferential ends of the arc-shaped clamping block and the inner wall of the arc-shaped clamping block;

[0020] And / or a chamfer or rounded corner is formed between one or both circumferential ends of the arc-shaped clamping block and the outer wall of the arc-shaped clamping block.

[0021] Preferably, in a radial direction away from the central axis of the annular retainer, the notch has at least one notch width increasing ring portion and at least one notch width maintaining ring portion;

[0022] And / or, in the direction from the bottom of the notch to the top of the notch, the notch has at least one notch width maintaining section and at least one notch width increasing section.

[0023] Compared with the prior art, the plug-in stop structure provided by the present invention has made further improvements on the plug-in locking structure. An annular retaining frame is sleeved on the periphery of the plug connector, and a plurality of notches for accommodating arc-shaped clamping blocks are arranged on the upper end of the annular retaining frame. The inner width of the notch is smaller than the outer width of the arc-shaped clamping block and larger than the inner width of the arc-shaped clamping block to ensure that the arc-shaped clamping block can only move but cannot tip over in the direction of the central axis, and the arc-shaped clamping block is limited in radial movement stroke and circumferential movement stroke, ensuring that the arc-shaped clamping block will not fall or tilt due to uneven force during the insertion of the plug connector and cannot form an effective clamping connection with the plug connector. At the same time, before the annular retaining frame is placed in the outer sleeve, the positions of the arc-shaped clamping block and the elastic element can be manually adjusted to ensure that the arc-shaped clamping block can be effectively in the optimal position after installation, and the shape of the notch limits the path of the arc-shaped clamping block moving up and down. After the plug connector is inserted, the arc-shaped clamping block moves along the optimal path, and can form the largest contact area with the plug connector after the clamping connection is formed, which has a better anti-pullout effect and makes the connection more stable.

[0024] Another object of the present invention is to provide a prefabricated component combination connected by the plug-in stop structure.

[0025] To achieve the above-mentioned object, the present invention provides a prefabricated component combination, which comprises two or more prefabricated components that are sequentially butted together in one direction, characterized in that when two adjacent prefabricated components are spliced ​​together, the end of one prefabricated component is butted with the end of another prefabricated component by the plug-in stop structure described in any one of claims 1 to 9;

[0026] Preferably, each prefabricated component comprises a concrete body with a built-in rigid skeleton, wherein the rigid skeleton has a plurality of stress-bearing bars distributed in an array;

[0027] At least part of the stress-bearing bars in a prefabricated component are fixedly connected to a threaded body at one end, and / or at least part of the stress-bearing bars in another prefabricated component are fixedly connected to a nut sleeve at the other end.

[0028] The prefabricated component combination provided by the present invention has the above-mentioned technical effects due to the plug-in anti-retraction structure. Therefore, the concrete prefabricated component connection structure provided with the pre-plug-in anti-retraction structure should also have the corresponding technical effects, and also have the effects of high connection strength, good stability and good durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is an assembly diagram of the plug-in anti-retraction structure disclosed in the first embodiment of the present invention;

[0030] Figure 2 for Figure 1 An exploded view of the plug-in stop structure shown;

[0031] Figure 3It is a schematic diagram of the first structure of the annular retainer in the first embodiment of the present invention;

[0032] Figure 4 It is a schematic diagram of the second structure of the annular retainer in the first embodiment of the present invention;

[0033] Figure 5 A third structural schematic diagram of the annular retainer in the first embodiment of the present invention;

[0034] Figure 6 A fourth structural schematic diagram of the annular retainer according to the first embodiment of the present invention;

[0035] Figure 7 is a cross-sectional view of the notches of different annular retainers in the first embodiment of the present invention;

[0036] Figure 8 for Figure 1 A cross-sectional view of the guide ring shown;

[0037] Fig. 9 for Figure 8 Enlarged view of point A in the middle;

[0038] Fig.10 for Figure 1 A longitudinal cross-sectional view of the arc-shaped card block shown;

[0039] Fig.11 for Figure 1 A top view of the arc-shaped card block shown;

[0040] Fig.12 for Figure 1 A schematic diagram of a chamfered arc-shaped card block is shown;

[0041] Fig.13 for Figure 1 The schematic diagram of the process of the arc-shaped block moving downward when the insertion rod is inserted is shown;

[0042] Fig.14 for Figure 1 The schematic diagram of the elastic element structure shown;

[0043] Fig.15 for Figure 1 A schematic diagram of the structure of the plunger shown;

[0044] Fig.16 It is a schematic structural diagram of an annular retainer disclosed in a second embodiment of the present invention;

[0045] Fig.17 A cross-sectional view of a prefabricated component assembly in a third embodiment of the present invention;

[0046] Fig.18 It is a strong pull buckle structure in the prior art.

[0047] Figures 1 to 17 middle:

[0048] 100. Insertion stop structure 1. Outer sleeve 11. Accommodating cavity 12. Pier head clamp 2. Insert rod 3. Guide ring 4. Arc clamp 5. Elastic element 6. Ring retainer 12. Pier head clamp 21. First external thread 22. Insert joint 221. Upper reducer 222. Lower reducer 31. Second external thread 32. Horizontal surface 33. First inclined surface 34. Second inclined surface 41. Upper surface 42. Outer side surface 43. Bottom surface 51. Support plate 511. First side 512. Second side 52. Elastic leg 53. Horizontal flat plate section 61. Notch 62. Guide hole 63. Notch width maintaining section 64. Notch width increasing section 65. Second notch width increasing section 66. Third notch width increasing section 67. Guide groove 68. Notch width increasing ring 69. Notch width maintaining ring 200. Prefabricated component assembly 201. Prefabricated component 202. Forced ribs 203. Screw connection

[0049] Fig.18 middle:

[0050] 301. Intermediate nut 302. Insert rod 303. Card 304. Support ring 305. Elastic member 3022. Tensioning step 3021. Reducer plug connector 3023. Recessed portion 306. Nut sleeve 3011. Inner hole DETAILED DESCRIPTION

[0051] In order to facilitate the understanding of the technical solution of the present invention, a detailed description is given below in conjunction with the accompanying drawings and specific embodiments.

[0052] In this article, the terms "upper, lower, inside, outside" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0053] Embodiment 1

[0054] like Figure 1-2 As shown, in the first embodiment, the plug-in stop structure 100 provided therein comprises: an outer sleeve 1, an insert rod 2, a guide ring 3, an arc-shaped block 4, an elastic element 5 and an annular retainer 6. In this embodiment, the direction away from the central axis in any radial direction along the annular retainer 6 is first defined as the outside, and the opposite direction is defined as the inside; the inside and outside directions of the other components are preferably referred to this defined direction in the absence of specific descriptions.

[0055] Specifically, the outer sleeve 1 has a receiving cavity 11, and one axial end of the insertion rod 2 forms a reducer plug joint 22 that can be inserted into the receiving cavity 11. The annular retainer 6 is sleeved on the outer periphery of the reducer plug joint 22 and is sealed in the receiving cavity by the guide ring 3. The guide ring 3 and the outer sleeve 1 are fixed by screwing. The upper and lower end faces of the annular retainer 6 are respectively abutted against the lower end face of the guide ring 3 and the pier head clamp 12 at the bottom of the receiving cavity 11 to prevent the annular retainer 6 from displacement or shaking when the plug-in stop structure 100 is in use, thereby affecting the accuracy of the plug-in. The annular retainer 6 is at one end close to the guide ring 3 (i.e. Figure 1 The upper end portion of the ring retainer 6 is provided with two or more notches 61 at intervals along the circumferential direction. The number of notches 61 is preferably 4, and each notch 61 is preferably provided at equal intervals and has the same specifications. Of course, in the annular retainer 6 provided by the present invention, the number of notches 61 can also be 2, 3, 5, 6, etc. The notch 61 contains an arc-shaped clamping block 4 whose outer circumferential width L2 is greater than the inner circumferential width L1 for reverse clamping the reducer plug connector 22, such as Fig.11 In this embodiment, the width of the two ends of the component in the circumferential direction is defined as the circumferential width.

[0056] When the inner width L of the notch 61 is smaller than the outer width L2 of the arc-shaped block 4 and larger than the inner width L1 of the arc-shaped block 4, the arc-shaped block 4 can move in the radial direction of the annular retainer 6 in the notch 61 without falling or tipping over toward the central axis, wherein the inner width L of the notch 61 is the minimum width in the radial direction of the annular retainer 6, which can be the width of the innermost side of the notch 61 or the width of any part between the inner and outer sides, and there must be an outer width with a larger width value in any radial direction away from the central axis of the annular retainer 6. And the outer width is larger than the inner width L of the notch 61. Similarly, the outer width of the notch is larger than the outer circumferential width L2 of the arc-shaped block 4. When the arc-shaped block 4 moves radially toward the axis of the annular retainer 6 to a certain position, the side wall of the notch 61 where the inner width L is located forms a resistance with the side wall of the arc-shaped block 4 to prevent the arc-shaped block 4 from continuing to move inward and then falling. In the radial direction away from the central axis of the annular retainer 6, the notch 6 has at least one notch width increasing ring portion 68 and / or at least one notch width maintaining ring portion 69. Figure 7 Two of these cases are shown; Figure 7 In (a), the width of the transition between the notch width enlarged ring portion 68 and the inner notch enlarged ring portion 69 is the smallest, which is the notch inner width L, and acts as a radial stop; Figure 7(b), the inner side width of the notch width increasing ring portion 68 is the smallest, which is the notch inner width L, and acts as a radial stop. In this embodiment, the notch 61 has only one notch width increasing portion 68 in the radial direction away from the central axis of the annular retaining frame 6, and the two side walls are in an outward eight-shaped shape, which matches the arc-shaped block 4, and the outward eight-shaped shape can be symmetrical or asymmetrical.

[0057] like Figure 3 As shown, along the axial direction of the annular retainer 6, the width of the notch 61 can be kept consistent, as long as its inner width is smaller than the outer width L2 of the arc-shaped block 4 and larger than the inner width L1 of the arc-shaped block 4, the arc-shaped block 4 can move up and down in the notch 61 without tilting, falling or tipping. Fig.15 As shown, due to the reduced diameter portion at the lower end of the insertion rod 2, the arc-shaped block 4 moves inwardly along the radial direction of the annular retainer 6 while moving axially upward along the annular retainer 6, so the width of the notch 61 can also be gradually increased from bottom to top, that is, the two side walls of the notch 61 are upwardly shaped like an outward figure eight, as shown in FIG. Figure 4 Preferably, in the direction from the bottom of the notch 61 to the top of the notch 61, the notch 61 has at least one notch width maintaining section 63 and at least one notch width increasing section 64, such as Figure 5 shown.

[0058] In this embodiment, Figure 8-9 As shown, the lower end surface of the guide ring 3 includes a horizontal surface 32, a first inclined surface 33, and a second inclined surface 34, wherein the first lower surface 33 and the second inclined surface 34 have different inclination angles; when the insertion rod 2 is inserted and contacts the arc-shaped block 4, the arc-shaped block 4 abuts against the second inclined surface 34 of the lower end surface of the guide ring 3 under the push action of the elastic element 5. At this time, the intersection P2 of the upper surface 41 and the outer side surface 42 of the arc-shaped block 4 contacts the second inclined surface 34 on the lower end surface of the guide ring 3, and is at the maximum position that the arc-shaped block 4 can move upward, as shown in FIG. Fig.13 (a); when the insertion rod 2 is inserted into the guide ring 3 and continues to move downward, the plug connector 22 contacts the upper end surface of the arc-shaped block 4, enters the space surrounded by the arc-shaped block 4 and spreads the multiple arc-shaped blocks 4, and P2 is always in contact with the second inclined surface 34 and continues to slide downward along the second inclined surface 34, as shown in FIG. Fig.13 As shown in (b), after passing the second inclined surface 34, P2 contacts the first inclined surface 33 and slides downward along the first inclined surface 33; when P2 slides to the intersection P1 of the upper horizontal surface 32 of the guide ring 3 and the first inclined surface 33, the upper surface 41 of the arc-shaped block 4 contacts P1 and continues to move downward to the maximum expansion position of the arc-shaped block 4, as shown in FIG. Fig.13 As shown in (c), at this time, the largest diameter part of the plug connector 22 contacts the innermost part of the arc-shaped block 4.

[0059] When the plug connector 22 continues to be inserted downward, the arc-shaped clamping block 4 passes over the maximum diameter of the plug connector 22 and moves upward under the action of the elastic element 5. The upward movement path of the arc-shaped clamping block 4 is the same as the aforementioned downward movement path but in the opposite direction. The aforementioned movement path of the arc-shaped clamping block 4 is its optimal path. In order to ensure that the arc-shaped clamping block 4 does not tilt during the upward and downward movement, which affects the clamping effect between the arc-shaped clamping block 4 and the plug connector 22, a notch width maintaining section 63, a notch width increasing section 64, a second notch width increasing section 65, and a third notch width increasing section 66 are sequentially provided in the notch 61 from top to bottom, so that the side edges of the arc-shaped clamping block 4 always contact and slide with the two side walls of the notch, such as Figure 6 When the lower end surface of the guide ring 3 is in other shapes, the notch 61 can also be configured accordingly. For example, when the lower end surface of the guide ring 3 is conical, the notch 61 can be provided with a notch width maintaining section and two notch width increasing sections in sequence from top to bottom.

[0060] like Figure 6 As shown, the annular retainer 6 is provided with a guide hole 62 at the bottom of the notch 61 to partially accommodate the elastic element 5. The inner and outer side walls of the guide hole 62 are preferably parallel arcs. The guide hole 62 can be a through hole or a hole with a closed bottom. One end of the elastic element 5 extends into the notch 61 and pushes the arc-shaped clamping block 4 toward the guide ring 3. The other end passes through the guide hole 62 and is pressed onto the pier head clamping platform 12 or directly pressed onto the bottom of the guide hole 62. Fig.14 As shown, the top of the elastic element 5 is a support plate 51, and the first side edges 511 on the inner and outer sides of the support plate 51 are arcs and parallel to each other, and the second side edges 512 on the left and right sides have a certain radial width D to ensure that the elastic element 5 has a larger contact area with the bottom surface of the arc-shaped block 4; the left and right sides of the support plate 51 are respectively integrally formed with elastic legs 52, and the elastic legs 52 are formed by bending inwardly a plate having the same radial width D as the second side edges 512, and the bending parts of the two elastic legs 52 are staggered in height, and can also be multi-stage bending or S-shaped; when a downward force is applied to the support plate 51 of the elastic element 5, the elastic legs 52 slide to both sides respectively, so that the support plate 51 of the elastic element 5 moves downward, and when the downward force is withdrawn, the elastic legs 52 rebound due to the elastic effect, and the elastic element 5 returns to its original state; a flat plate section 53 can also be provided at the bottom of the elastic leg 52 to increase the contact area between the elastic element 5 and the support point and improve the bearing capacity of the elastic element; the elastic element 5 is preferably a leaf spring.

[0061] like Figure 6As shown, the circumferential surface of one end of the annular retainer 6 close to the guide ring 3 is an outer conical surface, and can also be arranged to be formed by connecting multiple sections of conical surfaces with different tapers, which matches the shape of the lower end surface of the guide ring 3, so that the annular retainer 6 can be completely fitted with the guide ring 3 after installation; the difference between the outer wall radius of the annular retainer 6 and the inner wall radius of the outer sleeve 1 is smaller than the radial thickness of the bottom of the arc 4, preventing the arc block 4 from falling into the gap between the annular retainer 6 and the outer sleeve 1.

[0062] like Fig.15 As shown, the plug connector 22 includes an upper reducing portion 221 and a lower reducing portion 222; the outer diameter of the upper reducing portion 221 gradually increases downward along the axial direction to form a truncated cone-shaped clamping portion with a small outer diameter at the upper end and a large outer diameter at the lower end. The arc-shaped clamping block 4 is sleeved on the truncated cone-shaped clamping portion on the plug connector 22 to form a reverse clamping of the plug connector to prevent the plug rod 2 from being pulled out. In order to enable the arc-shaped clamping block 4 to form an effective clamping at any position on the truncated cone-shaped clamping portion, the arc-shaped clamping block 4 The radius of the inner wall arc matches the outer diameter of the upper end of the upper reducing portion 221. When the arc-shaped clamping block 4 is clamped in the middle or lower part of the upper reducing portion 221, since the radius of the inner wall arc of the arc-shaped clamping block 4 is smaller than the radius of the contact position with the upper reducing portion 221, only the two sides of the inner wall of the arc-shaped clamping block 4 are in contact with the upper reducing portion 221. At this time, the reverse locking effect of the arc-shaped clamping block 4 on the plug connector 22 is poor. When the plug rod is subjected to a large pulling force, it is easy to slip, causing the reverse locking structure to fail.

[0063] In this regard, Fig.12 As shown, a chamfer 44 can be provided at the connection between the side wall at one or both ends of the arc block 4 and the inner wall of the arc block 4, and the chamfer 44 can also be replaced by a rounded corner to increase the contact area between the arc block 3 and the plug connector 22, and improve the anti-pullout effect of the reverse locking structure. A chamfer or rounded corner can also be provided between the side wall at one or both ends of the arc block 4 and the outer wall of the arc block 4 to prevent the arc block 4 from being stuck with the side wall of the notch 61 when it moves radially along the annular retainer 6 in the notch 61, so that the arc block 4 cannot form an effective clamping connection with the plug rod 2.

[0064] Embodiment 2

[0065] In this embodiment, the same parts as those in the first embodiment are given the same figure marks, and the same text descriptions are omitted.

[0066] The principle and structure of this embodiment are basically the same as those of the first embodiment, except that Fig.16As shown, the annular retainer 6 is provided with a guide groove 67 at the bottom of the notch 61, which can partially accommodate the elastic element 5. The guide groove 67 opens radially outward along the annular retainer 6, and the guide groove 67 penetrates axially along the annular retainer 6. A support portion can also be provided at the lower part of the guide groove 67. One end of the elastic element 5 extends into the notch 61 and pushes the arc-shaped block 4 toward the guide ring 3, and the other end passes through the guide groove 67 and is pressed on the pier head clamping table 12 or directly pressed on the support portion at the lower part of the guide groove 67; the distance between the outer opening of the guide groove 67 and the inner wall of the outer sleeve 1 is less than the radial thickness of the bottom of the arc-shaped block 4. The guide groove 67 and the inner wall of the outer sleeve 1 limit the elastic element 5 in the four directions of front, back, left and right to prevent the elastic element from tipping over, while facilitating processing and saving raw materials.

[0067] Embodiment 3

[0068] In this embodiment, the same parts as those in the first embodiment are given the same figure marks, and the same text descriptions are omitted.

[0069] like Fig.17 As shown, in addition to the above-mentioned plug-in anti-retraction structure, the present invention further provides a prefabricated component assembly 200, comprising more than two prefabricated components 201 that are sequentially butted together along one direction, when two adjacent prefabricated components 201 are spliced ​​together, the end of one prefabricated component is butted with the end of another prefabricated component by the above-mentioned plug-in anti-retraction structure;

[0070] Preferably, each prefabricated component includes a concrete body with a built-in rigid skeleton, wherein the rigid skeleton has a plurality of stress-bearing bars 202 distributed in an array; and at least a portion of the stress-bearing bars in one prefabricated component are fixedly connected to a screw body 203 at one end, and at least a portion of the stress-bearing bars in another prefabricated component are fixedly connected to an outer sleeve 1 at the other end, and the other end of the insertion rod 2 is screwed and fixed to the screw body through an external thread 21, and the guide ring 3, the arc-shaped clamping block 4, the elastic element 5 and the annular retaining frame 6 are sequentially arranged in the outer sleeve 1, and the two prefabricated components are firmly connected through the clamping fit between the plug connector 22 of the insertion rod 2 and the arc-shaped clamping block 4.

[0071] Specifically, the precast components can be precast concrete piles or precast concrete caps or precast concrete slabs or precast concrete walls or precast concrete columns or precast concrete beams or precast concrete balconies or precast concrete bay windows or precast concrete stairs or precast concrete elevator shafts or precast concrete roofs or precast concrete terraces, etc.

[0072] The above are only preferred embodiments of the present invention. The protection scope of the present invention shall be based on the scope defined by the claims. Several improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A plug-in stop structure, characterized in that: include: An outer sleeve having a receiving cavity; An insert rod, one axial end of which is formed into a reducer plug connector that can be inserted into the accommodating cavity; as well as An annular retainer, which is sleeved on the periphery of the reducer plug connector and is sealed in the accommodating cavity by a guide ring; The annular retainer has two or more notches spaced apart in the circumferential direction at one end portion close to the guide ring, and the notches contain arc-shaped clamping blocks with an outer circumference width greater than an inner circumference width for reverse clamping the reducer plug connector; The inner width of the notch is smaller than the outer width of the arc-shaped block and larger than the inner width of the arc-shaped block so that the arc-shaped block can move axially and / or radially along the annular retainer; when the arc-shaped block moves radially toward the axis of the annular retainer to a certain position, the side wall of the portion where the inner width of the notch is located forms a resistance with the side wall of the arc-shaped block to prevent the arc-shaped block from continuing to move inward and then falling; The annular retainer has a built-in elastic element, one end of which extends into the notch and pushes the arc-shaped clamping block toward the guide ring; In the radial direction away from the central axis of the annular retainer, the two side walls of the notch are in an outward-facing "X" shape; In the axial direction of the annular retainer, the two side walls of the notch are in an outward-facing "X" shape; In the direction from the notch bottom to the notch top, the notch has at least one notch width maintaining section and at least one notch width increasing section.

2. The plug-in anti-retraction structure according to claim 1, characterized in that: The annular retaining frame is provided with a guide groove or a guide hole at the bottom of the notch which can partially accommodate the elastic element.

3. The plug-in anti-retraction structure according to claim 1 or 2, characterized in that: The elastic element is composed of a support plate and elastic legs which are integrally formed with both side ends of the support plate, and the elastic legs include at least one bending section and / or arc section.

4. The plug-in anti-retraction structure according to claim 1, characterized in that: The peripheral surface of one end of the annular retainer close to the guide ring is an outer conical surface; And / or, the difference between the radius of the inner peripheral wall of the outer sleeve and the radius of the outer peripheral wall of the annular retainer is smaller than the radial thickness of the bottom of the arc-shaped clamping block.

5. The plug-in anti-retraction structure according to claim 1, characterized in that: Also includes: A screw-on body screwed to fix the other end of the plug rod; A chamfer or rounded corner is formed between one or both circumferential ends of the arc-shaped clamping block and the inner wall of the arc-shaped clamping block; And / or, a chamfer or rounded corner is formed between one or both circumferential ends of the arc-shaped clamping block and the outer wall of the arc-shaped clamping block.

6. The plug-in anti-retraction structure according to claim 1, characterized in that: In the radial direction away from the central axis of the annular retainer, the notch has at least one notch width increasing ring portion and at least one notch width maintaining ring portion; And / or, in the direction from the bottom of the notch to the top of the notch, the notch has at least one notch width maintaining section and at least one notch width increasing section.

7. A prefabricated component assembly, comprising two or more prefabricated components connected in sequence along one direction, characterized in that: When two adjacent prefabricated components are spliced ​​together, the end of one prefabricated component is butted against the end of another prefabricated component by the plug-in stop structure described in any one of claims 1 to 6; Each prefabricated component comprises a concrete body with a rigid frame built in, wherein the rigid frame has a plurality of force-bearing bars distributed in an array; At least part of the stress-bearing bars in a prefabricated component are fixedly connected to a screw-connected body at one end, and / or at least part of the stress-bearing bars in another prefabricated component are fixedly connected to the outer sleeve at the other end.

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