An anti-pullout device and method for underground prefabricated structure bottom plate

Abstract

The invention discloses an anti-pullout device and method for an underground prefabricated structure bottom plate, which solves the problem of an inclination angle between an anti-pullout pile and a prefabricated structure bottom plate in the prior art, and has the beneficial effects of being able to adjust the inclination of a pile cap, improving the integrity of the connection and ensuring the stability of the pile cap. The specific scheme is as follows: an anti-pullout device for an underground prefabricated structure bottom plate comprises an anti-pullout pile, a connecting steel bar is reserved at the top of the anti-pullout pile; a pile cap structure, the pile cap structure comprises a pile cap and a pile cap base arranged at the top of the anti-pullout pile, a leveling component is arranged between the pile cap base and the pile cap, the connecting steel bar is fixedly connected to the pile cap after passing through the pile cap structure, and an open groove is arranged in the middle of the pile cap; a movable member, the movable member is arranged in the open groove of the pile cap, a distance is set between the movable member and the side wall of the open groove, the movable member is sealed and connected to the top of the pile cap, and the movable member is movable relative to the pile cap so that its through hole is aligned with the reserved hole in the bottom plate.

Description

Technical Field

[0001] The invention relates to the field of urban underground space, and in particular to an anti-pullout device and method for an underground prefabricated structure bottom plate. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Prefabricated construction of underground projects has the advantages of being green, efficient, and of high construction quality, and is being widely used in underground engineering construction. In underground engineering construction, the structure has the problem of floating due to the influence of groundwater. At present, measures such as pull-out piles are often used to suppress the floating of the structure. It is difficult to connect the pull-out piles of prefabricated underground structures with prefabricated components, and the upper weight of the structure is often used to control the floating of the underground space. For open underground structures, such as prefabricated U-shaped trough structures, there is no soil covering the upper part, and the weighting method is difficult to achieve. It is urgent to design a device that can connect the prefabricated structure bottom plate with the pull-out piles to form an anti-pull device for the prefabricated structure bottom plate to ensure the safety of the structure.

[0004] There is a problem of difficulty in positioning when connecting the pull-out piles with the prefabricated structure base plate, which is mainly manifested in the following points:

[0005] (1) The pull-out piles are constructed vertically, but the prefabricated structure has a certain inclination due to linear influence, which results in the pull-out piles and the prefabricated structure base plate not being perpendicular, and the connection having an inclination;

[0006] (2) During the assembly of the prefabricated underground structure, due to the influence of the rubber pad in the assembly gap, there is a certain deviation between the connection holes and the reserved holes of the pile foundation, resulting in poor connection positioning accuracy and the possibility of connection failure. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an anti-pullout device for the base plate of an underground prefabricated structure, which greatly improves the assembly speed and overall stability of the structure through the combination of prefabricated structures, and enhances the anti-floating and anti-seepage properties of the prefabricated structure.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0009] An anti-pullout device for an underground prefabricated structure bottom plate, comprising:

[0010] Pull-out piles, with connecting steel bars reserved at the top of the piles;

[0011] The pile cap structure includes a pile cap and a pile cap base arranged at the top of the pull-out pile, a leveling assembly is arranged between the pile cap base and the pile cap, a connecting steel bar passes through the pile cap structure and is fixedly connected to the pile cap, and an open groove is arranged in the middle of the pile cap;

[0012] A movable member is arranged in the opening groove of the pile cap, the movable member is spaced apart from the side wall of the opening groove, the movable member is sealed and connected to the top of the pile cap, a through hole is arranged at the center of the movable member, and the movable member is movable relative to the pile cap so that the through hole is aligned with the reserved hole of the bottom plate;

[0013] A hollow anti-pull-out connector is provided through a reserved hole of the bottom plate and a through hole of the movable component.

[0014] As described above, an anti-pull-out device for an underground prefabricated structure base plate, the hollow anti-pull-out connector is circumferentially provided with a plurality of openings, and the sealing glue liquid is injected through the top of the hollow anti-pull-out connector, and flows through the openings to the space between the hollow anti-pull-out connector and the reserved hole of the base plate, and between the hollow anti-pull-out connector and the through hole of the movable component, thereby ensuring the integrity of the connection between the hollow anti-pull-out connector and the prefabricated structure base plate and the movable component.

[0015] In the anti-pullout device for the base plate of an underground prefabricated structure as described above, a plurality of prefabricated pipes are arranged in the movable member, and the prefabricated pipes are arranged obliquely relative to the central axis of the movable member. One end of the prefabricated pipe is connected to the through hole, and the other end of the prefabricated pipe is arranged on the outer side wall of the support block, so that the slurry flows in the annular direction of the movable member to fill the space between the side wall of the opening groove and the movable member, thereby ensuring that the movable member and the pile cap finally form an integrated structural member.

[0016] As described above, an anti-pullout device for an underground prefabricated structure bottom plate, the leveling components are arranged at multiple locations, and the intervals between two adjacent leveling components are set at a set angle;

[0017] The leveling assembly includes a base, which is arranged on the surface of the pile cap base. The base supports a screw rod. An adjusting nut is circumferentially arranged on the base or the screw rod. The screw rod cooperates with the pile cap through a threaded structure. The adjusting nut is rotated relative to the screw rod. Since the screw rod cannot rotate, the pile cap can be adjusted.

[0018] The anti-pullout device for the base plate of an underground prefabricated structure as described above, wherein the movable member comprises a support block, the top of the support block protrudes from the top of the pile cap, a plurality of movable wheels are arranged at the bottom of the support block, and the through hole is arranged at the center of the support block;

[0019] The through hole is connected to the hollow anti-pullout connector via a threaded structure.

[0020] As described above, an anti-pullout device for an underground prefabricated structure base plate is provided on the peripheral side of the support block, one side of the flexible slurry stop part is connected to the support block, and the other side of the flexible slurry stop part is connected to the pile cap. The flexible slurry stop part has a certain flexibility, which not only ensures the tightness during the injection of the sealant liquid, but also has a certain elasticity with the injection of the sealant liquid.

[0021] In the anti-pullout device for the base plate of an underground prefabricated structure as described above, the support block is an inverted T-shaped structure, and the pile cap opening groove is also an inverted T-shaped structure, which effectively limits the support block and prevents the movable component from falling out of the pile cap opening groove.

[0022] In the anti-pullout device for the underground prefabricated structure base plate as described above, the connecting steel bar passes through the pile cap base and the pile cap in sequence, is bent from the top of the pile cap to the side of the pile cap, and is welded to the pile cap.

[0023] In a second aspect, the present invention provides a construction method for an anti-pullout device for an underground prefabricated structure bottom plate, comprising the following contents:

[0024] A movable member is arranged, and a pile cap is constructed around the movable member, wherein the movable member is sealed and connected to the top of the pile cap;

[0025] Excavate foundation pit and construct anti-pull piles;

[0026] After the construction of the pull-out pile is completed, a pile cap base is set on the top of the pile cap. The pile cap is supported by a leveling assembly on the surface of the pile cap base. The upper surface of the pile cap is leveled by the leveling assembly. The connecting steel bars reserved for the pull-out pile pass through the pile cap base and the pile cap and are fixedly connected to the pile cap.

[0027] Apply cushion layer around the pile cap structure;

[0028] Cast a flat strip on the upper surface of the cushion layer, with the top of the flat strip flush with the top of the movable member;

[0029] The prefabricated structural base plate is supported by the platform belt and the top end of the movable member;

[0030] Insert the hollow anti-pullout connector into the reserved hole of the bottom plate and move the movable component so that the through hole of the movable component is aligned with the reserved hole of the bottom plate, thereby realizing the connection between the hollow anti-pullout connector and the movable component.

[0031] The construction method of the anti-pullout device for the underground prefabricated structure bottom plate as described above also includes the following contents:

[0032] The sealant liquid is injected through the top of the hollow pull-out connector, flows through the opening of the hollow pull-out connector to between the hollow pull-out connector and the reserved hole of the bottom plate, between the hollow pull-out connector and the through hole of the movable component, and flows to the annular direction of the movable component through the prefabricated pipe in the movable component;

[0033] In addition, the gap between the pile cap and the flat strip is filled with grouting;

[0034] Grouting is performed at the top of the hollow pull-out resistant connector in the reserved hole of the base plate to form a post-sealing grouting body.

[0035] The beneficial effects of the present invention are as follows:

[0036] 1) In the present invention, the pile cap structure is installed at the top of the pull-out pile. The pile cap structure includes a pile cap base and a pile cap. A leveling component is arranged between the two. The pile cap base and the pile cap are connected as a whole through the leveling component. The leveling component can be used to adjust the inclination of the pile cap relative to the pile cap base to keep it horizontal or inclined so as to match the prefabricated structure bottom plate above it, so as to ensure that the connection between the hollow pull-out connector and the pile cap is not inclined but vertical, thereby improving the integrity of the connection and ensuring the stability of the pile cap;

[0037] The movable member is arranged in the opening groove of the pile cap and is movable relative to the pile cap. In this way, when the through hole of the movable member is not aligned with the reserved hole of the base plate, the movable member is moved so that the hollow pull-out connector is completely aligned with the through hole of the movable member, thereby ensuring the effective connection between the prefabricated structure base plate and the pull-out pile, and ensuring the connection positioning accuracy, thereby ensuring the integrity of the pile cap, the pull-out pile and the prefabricated structure base plate after connection and docking.

[0038] 2) The present invention arranges the overall structure, and the movable components are arranged in the pile cap in advance. The pile cap structure is connected with the connecting steel bars reserved for the pull-out pile, so that the overall components are basically prefabricated components. The connection between the prefabricated structure base plate and the pull-out pile is realized through the combination of prefabricated structures, which greatly improves the assembly speed and overall stability of the structure, and enhances the anti-floating and anti-seepage properties of the prefabricated structure.

[0039] 3) The annular openings in the hollow pull-out-resistant connector of the present invention allow the sealant liquid to enter from the hollow pull-out-resistant connector into the space between the hollow pull-out-resistant connector and the reserved hole in the base plate, and between the hollow pull-out-resistant connector and the through hole in the movable component. By setting the prefabricated pipe in the movable component, the sealant liquid can enter between the side wall of the opening groove and the side wall of the movable component, forming a construction method and process of "hollow pull-out-resistant connector + movable component + sealant liquid", thereby ensuring the applicability of the pull-out piles to the prefabricated structure base plate and achieving the assembly integrity, tightness and stability of the prefabricated structure base plate.

[0040] 4) The present invention arranges a flexible stop grouting member between the support block and the pile cap to ensure tightness during the injection of the sealant liquid and improve the integrity of the anti-pullout device. The flexible stop grouting member is flexible and can change with the injected sealant liquid, but it can prevent the sealant liquid from escaping, thereby ensuring integrity and sealing.

[0041] 5) The construction method provided in the present invention can achieve a reliable and stable connection between the prefabricated structure base plate and the pull-out piles, and through the hollow pull-out connector, the sealant liquid is poured into the gap between the prefabricated structure base plate and the hollow pull-out connector, the gap between the hollow pull-out connector and the movable member, and the gap between the movable member and the pile cap, so that the movable member and the upper pile cap form a fixed whole, and then grouting is injected into the gap part of the flat strip. After the grouting is completed, the construction is completed, and the prefabricated structure base plate, pile cap and pull-out piles are bonded as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0043] Figure 1 It is a schematic diagram of an anti-pullout device for an underground prefabricated structure base plate according to one or more embodiments of the present invention.

[0044] Figure 2 It is a schematic diagram of a leveling assembly in an anti-pullout device for an underground prefabricated structure base plate according to one or more embodiments of the present invention.

[0045] Figure 3 It is a schematic diagram of the connection between an anti-pullout pile and a pile cap structure in an anti-pullout device for an underground prefabricated structure base plate according to one or more embodiments of the present invention.

[0046] Figure 4 It is a schematic diagram of the arrangement of a flexible grout-stopping member in an anti-pullout device for an underground prefabricated structure base plate according to one or more embodiments of the present invention.

[0047] Figure 5 It is a schematic diagram of the arrangement of movable components in an anti-pullout device for an underground prefabricated structure base plate according to one or more embodiments of the present invention.

[0048] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0049] Among them: 1—pull-out pile; 2—connecting steel bars; 3—cushion; 4—flat strip; 5—prefabricated structural base plate; 6—movable component; 7—hollow pull-out connector; 8—rubber gasket; 9—rebar reverse bend weld; 10—pile cap; 11—leveling assembly; 12—soil; 13—flexible grouting member; 14—through hole; 15—prefabricated pipe; 16—movable wheel; 17—pile cap base; 18—screw; 19—base; 20—adjusting nut; 21—wood block; 22—adhesive; 23—reserved hole in base plate; 24—post-sealing grouting. DETAILED DESCRIPTION

[0050] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0052] As introduced in the background technology, there is an inclination problem in the connection between the pull-out pile and the prefabricated structure bottom plate in the prior art. In order to solve the above technical problem, the present invention proposes an pull-out device for the underground prefabricated structure bottom plate.

[0053] Embodiment 1

[0054] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, an anti-pullout device for an underground prefabricated structure bottom plate comprises:

[0055] A pull-out pile 1 is arranged in a soil body 12, a connecting steel bar 2 is reserved at the top of the pull-out pile, and the connecting steel bar is arranged at multiple locations along the longitudinal direction of the pull-out pile, and the connecting steel bar is arranged close to the outer wall of the pull-out pile to avoid the center;

[0056] The pile cap structure includes a pile cap 10 and a pile cap base 17 arranged at the top of the pull-out pile, a leveling assembly 11 is arranged between the pile cap base and the pile cap, a connecting steel bar 11 passes through the pile cap structure and is fixedly connected to the pile cap, and an open groove is arranged in the middle of the pile cap 10;

[0057] A movable member 6 is disposed in the pile cap opening groove, the movable member is spaced apart from the side wall of the opening groove, the movable member is sealed and connected to the top of the pile cap, a through hole is disposed at the center of the movable member, and the movable member is movable relative to the pile cap 10 so that the through hole thereof is aligned with the reserved hole of the bottom plate;

[0058] The hollow anti-pullout connector 7 is arranged through the reserved hole of the bottom plate and the through hole of the movable component.

[0059] It should be explained that the outer diameter of the pile cap base 17 is the same as that of the pile cap, and the thickness of the pile cap base is smaller than the thickness of the pile cap.

[0060] It is easy to understand that the leveling components 11 are arranged in multiple locations, and the intervals between two adjacent leveling components are set at a set angle;

[0061] refer to Figure 2 As shown, the leveling assembly 11 includes a base 19, which is fixed to the surface of the pile cap base. A triangular support is arranged on the circumferential side of the base. The triangular support makes the connection between the pile cap base and the upper part of the pile cap more stable. The base 19 supports the screw rod, and an adjusting nut 20 is arranged circumferentially on the screw rod. The screw rod 18 is connected to the pile cap through a threaded structure. A threaded hole is arranged on the lower surface of the pile cap. The threaded hole of the pile cap is connected to the top of the screw rod. The adjusting nut 20 is rotated relative to the screw rod. Since the screw rod cannot rotate, the height of the pile cap relative to the screw rod can be adjusted, thereby adjusting the inclination of the pile cap to cooperate with the prefabricated structure bottom plate (parallel to the prefabricated structure bottom plate), which is beneficial to the installation of the hollow pull-out resistant connector.

[0062] It should be explained that the pile cap base 17 and the pile cap 10 are both provided with holes for connecting the steel bars 2 to pass through, as shown in FIG. Figure 3 As shown, the connecting steel bar 2 passes through the reserved holes of the pile cap base 17 and the pile cap 10 and is then reversely bent and welded to the outer wall of the pile cap, so that the pile cap structure and the pull-out pile form an integrated structure.

[0063] In this embodiment, a through hole is set in the center of the hollow anti-pull connector 7, and a plurality of openings connected to the through hole are set in the annular direction of the hollow anti-pull connector 7. The openings are set in the upper half of the hollow anti-pull connector. The sealant liquid is injected through the top of the hollow anti-pull connector, and flows through the openings to the space between the hollow anti-pull connector 7 and the reserved hole of the base plate, and between the hollow anti-pull connector 7 and the through hole of the movable component 6, thereby ensuring the integrity of the connection between the hollow anti-pull connector and the prefabricated structure base plate and the movable component.

[0064] It should be noted that reference Figure 5 As shown, a plurality of prefabricated pipes 15 are provided in the movable member 6. The prefabricated pipes 15 are located on both sides of the through hole 14 of the movable member. The prefabricated pipes are inclined relative to the central axis of the movable member. One end of the prefabricated pipe 15 is connected to the through hole, and the other end of the prefabricated pipe is provided on the outer wall of the support block, so that the sealing glue flows in the annular direction of the movable member to fill the space between the side wall of the opening groove and the movable member, thereby ensuring that the movable member and the pile cap finally form an integrated structural member.

[0065] In this embodiment, the hollow pull-out-resistant connector 7 is a hollow pull-out-resistant pin, the reserved hole in the bottom plate is T-shaped, and a rubber gasket 8 is arranged at the reserved hole in the bottom plate to play a role in anti-seepage. The hollow pull-out-resistant pin is then installed in the prefabricated structure bottom plate, and the movable component is moved by the hollow pull-out-resistant pin so that the hollow pull-out pin is aligned with the through hole of the movable component for installation. After the installation is completed, the prefabricated structure bottom plate and the pile cap are connected as one.

[0066] Moreover, a plurality of transverse holes are arranged in the lower half of the hollow anti-pullout connector 7, and the transverse holes are connected with the through holes. After the sealant enters the through holes, it flows into the prefabricated pipe 15 through the transverse holes. After the hollow anti-pullout connector is connected to the movable component, the transverse holes can be aligned with the opening of the prefabricated pipe to allow the sealant to flow out smoothly.

[0067] refer to Figure 5 As shown, the movable member includes a support block 6, the top of the support block protrudes from the top of the pile cap, and a plurality of movable wheels 16 are arranged at the bottom of the support block. The movable wheels are specifically universal wheels, which are mounted on the lower surface of the support block by bolts, and a through hole is arranged at the center of the support block;

[0068] The through hole is connected to the hollow anti-pull-out connector via a threaded structure, so the through hole is a threaded hole, and the inner diameter of the through hole is matched with the outer diameter of the hollow anti-pull-out connector.

[0069] It is easy to understand that the support block is an inverted T-shaped structure, and the pile cap opening groove is also an inverted T-shaped structure. The inner diameter of the pile cap opening groove at the larger position is larger than the outer diameter of the lower half of the support block. The step of the pile cap opening groove effectively limits the support block to prevent the movable component from falling out of the pile cap opening groove.

[0070] In this embodiment, the support block is a prefabricated rigid material, and the prefabricated pipe inside the support block can be made into the support block by welding. After the support block is set, a pile cap is set on its periphery (the pile cap is divided into a ring part and a base plate), so that the movable component is reserved in the pile cap.

[0071] refer to Figure 4 As shown, a flexible grout-stopping member 13 is arranged on the peripheral side of the support block. The material of the flexible grout-stopping member is TPO (thermoplastic polyolefin) flexible grout-stopping material. The TPO flexible grout-stopping material can play the functions of expansion and contraction and anti-seepage. One side of the flexible grout-stopping member is connected to the support block, and the other side of the flexible grout-stopping member is connected to the pile cap. The flexible grout-stopping member has a certain flexibility, which not only ensures the tightness during the injection of the sealant liquid, but also has a certain expansion and contraction with the injection of the sealant liquid; the support block moves through the universal wheel and the flexible grout-stopping member;

[0072] Grooves are respectively provided in the pile cap and the support block. The flexible stop grouting member is first bonded to the pile cap and the support block by an adhesive 22. To prevent the bond from falling off, a wooden block 21 is provided as a plug. One end of the flexible stop grouting member is squeezed into the groove of the pile cap through one wooden block, and the other end of the flexible stop grouting member is inserted into the groove of the support block 6 through another wooden block, and the wooden block is used to prevent the stop grouting material from falling off.

[0073] In addition, the sealant liquid specifically adopts existing epoxy resin.

[0074] In this embodiment, the movable components are arranged in the pile cap in advance through the setting of the overall structure, and the pile cap structure is connected with the connecting steel bars reserved for the pull-out pile, so that the overall components are basically prefabricated components. The connection between the prefabricated structure base plate and the pull-out pile is realized through the combination of prefabricated structures, which greatly improves the assembly speed and overall stability of the structure, and enhances the anti-floating and anti-seepage properties of the prefabricated structure.

[0075] Embodiment 2

[0076] This embodiment provides a construction method for an anti-pullout device for an underground prefabricated structure bottom plate, including the following contents:

[0077] A movable member is arranged, and a pile cap is constructed around the movable member, wherein the movable member is sealed and connected to the top of the pile cap;

[0078] Excavation of foundation pit and construction of anti-pull piles: The foundation pit adopts the type of retaining piles + internal support. The foundation pit is excavated by large machinery to avoid disturbing the original soil at the bottom of the trench as much as possible to ensure that the bearing capacity of the base meets the requirements. During construction, the machinery excavates to 300mm above the base, and the remaining earthwork is cleared manually. After the excavation of the foundation pit is completed, the foundation treatment is required. After the foundation treatment is completed, the construction of anti-pull piles is required. First, the casing is buried, and then the hole is opened and drilled, and then the hole is cleaned, the steel cage is hoisted, the hole is cleaned twice, and then the concrete is poured. Finally, the inspection is carried out, and the construction of the anti-pull piles is completed;

[0079] After the construction of the anti-pullout pile is completed, a pile cap base is set on the top thereof, the pile cap is supported by a leveling assembly on the surface of the pile cap base, the upper surface of the pile cap is leveled by the leveling assembly, and the connecting steel bars reserved for the anti-pullout pile are passed through the pile cap base and the pile cap, then bent back and welded to form a steel bar bent back weld 9;

[0080] A cushion layer 3 is applied around the pile cap structure; the outside of the pile cap, the reserved holes of the pile cap and the internal through holes need to be protected to prevent water from flowing into them when the cushion layer is applied. Before applying the cushion layer, a geotextile is applied on the upper part of the pile cap to prevent water from flowing into the holes when the cushion layer is applied. After the sealing is completed, a plain concrete cushion layer is applied, and the cushion layer is flush with the upper part of the pile cap;

[0081] Cast a flat strip 4 on the upper surface of the cushion layer, with the top of the flat strip flush with the top of the movable component;

[0082] The prefabricated structural floor is supported by flat strips and the top of the movable member;

[0083] Insert the hollow anti-pullout connector 7 into the reserved hole 23 of the bottom plate, and move the movable member so that the through hole of the movable member is aligned with the reserved hole of the bottom plate, thereby realizing the connection between the hollow anti-pullout connector and the movable member.

[0084] Among them, the flat strip 4 is a precision flat strip. In order to ensure the smooth construction of the prefabricated structure base plate during the construction process, the precision flat strip construction process is adopted to ensure that the longitudinal linearity of the upper component is controllable. The thickness of the precision flat strip is flush with the top of the movable component inside the pile cap, and there are gaps between the precision flat strips.

[0085] Also includes the following:

[0086] A flexible grout stopper is pre-installed at the gap between the pile cap and the movable member, and is first bonded to the pile cap and the movable member by an adhesive. The flexible grout stopper can prevent the epoxy resin from running out, thereby ensuring integrity and sealing.

[0087] In order to prevent the pile cap structure and the prefabricated structure bottom plate from moving, the sealant liquid is injected through the top of the hollow pull-out connector, flows through the opening of the hollow pull-out connector to the space between the hollow pull-out connector and the reserved hole of the bottom plate, between the hollow pull-out connector and the through hole of the movable member, and flows to the annular direction of the movable member through the prefabricated pipe in the movable member;

[0088] After the epoxy resin is applied, there is a gap on the upper part of the hollow anti-pullout pin, and grouting is performed on the top of the hollow anti-pullout connector in the reserved hole of the bottom plate to form a rear sealing grouting body 24 to ensure the integrity of the hollow anti-pullout pin and the prefabricated structure bottom plate 5;

[0089] In addition, gaps are set between the flat strips, and the gaps between the pile cap and the flat strips are filled with grouting. Shrinkage-free cement slurry is used to prevent the overall instability of the structure, and the prefabricated structure base plate, pile cap and pull-out piles are bonded as a whole. Since the gaps between the flat strips are connected with the space between the pile cap and the prefabricated structure base plate, the reserved holes of the pile cap, and the space between the pile cap and the pile cap base, the grouting into the gaps in the flat strips will flow into the reserved holes of the pile cap and the space between the pile cap and the pile cap base. When the exhaust hole starts to ooze out grout and the grouting amount reaches the calculated requirements, the grouting can be stopped.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-pullout device for an underground prefabricated structure bottom plate, characterized in that: include: Pull-out piles, with connecting steel bars reserved at the top of the piles; The pile cap structure includes a pile cap and a pile cap base arranged at the top of the pull-out pile, a leveling assembly is arranged between the pile cap base and the pile cap, a connecting steel bar passes through the pile cap structure and is fixedly connected to the pile cap, and an open groove is arranged in the middle of the pile cap; A movable member is arranged in the opening groove of the pile cap, the movable member is spaced apart from the side wall of the opening groove, the movable member is sealed and connected to the top of the pile cap, a through hole is arranged at the center of the movable member, and the movable member is movable relative to the pile cap so that the through hole is aligned with the reserved hole of the bottom plate; A hollow anti-pullout connector, which is arranged through a reserved hole in the bottom plate and in a through hole of the movable component; The movable component comprises a support block, the top of which protrudes from the top of the pile cap, a plurality of movable wheels are arranged at the bottom of the support block, and the through hole is arranged at the center of the support block; the through hole is a threaded hole.

2. The anti-pullout device for underground prefabricated structure bottom plate according to claim 1, characterized in that: The hollow pull-out-resistant connector is provided with a plurality of openings in an annular direction, and the sealing glue is injected through the top of the hollow pull-out-resistant connector and flows through the openings to between the hollow pull-out-resistant connector and the reserved hole of the bottom plate, and between the hollow pull-out-resistant connector and the through hole of the movable component.

3. The anti-pullout device for underground prefabricated structure bottom plate according to claim 2, characterized in that: The movable member is provided with a plurality of prefabricated pipes, which are arranged obliquely relative to the central axis of the movable member, one end of the prefabricated pipe is connected to the through hole, and the other end of the prefabricated pipe is arranged on the outer wall of the support block so that the slurry flows in the annular direction of the movable member.

4. The anti-pullout device for underground prefabricated structure bottom plate according to claim 1, characterized in that: The leveling components are arranged in multiple locations, and the intervals between two adjacent leveling components are set at a set angle; The leveling assembly comprises a base, a base supporting a screw rod, an adjusting nut is arranged circumferentially on the screw rod, and the screw rod cooperates with the pile cap through a threaded structure.

5. The anti-pullout device for underground prefabricated structure bottom plate according to claim 1, characterized in that: A flexible grout-stopping member is arranged on the peripheral side of the support block, one side of the flexible grout-stopping member is connected to the support block, and the other side of the flexible grout-stopping member is connected to the pile cap.

6. The anti-pullout device for underground prefabricated structure bottom plate according to claim 1, characterized in that: The support block is an inverted T-shaped structure, and the pile cap opening groove is also an inverted T-shaped structure.

7. The anti-pullout device for underground prefabricated structure bottom plate according to claim 1, characterized in that: After the connecting steel bar passes through the pile cap base and the pile cap in sequence, it is bent from the top of the pile cap to the side of the pile cap and is welded to the pile cap.

8. A construction method for an anti-pullout device for an underground prefabricated structure bottom plate according to any one of claims 1 to 7, characterized in that: It includes the following: A movable member is arranged, and a pile cap is constructed around the movable member, wherein the movable member is sealed and connected to the top of the pile cap; Excavate foundation pit and construct anti-pull piles; After the construction of the pull-out pile is completed, a pile cap base is set on the top of the pile cap. The pile cap is supported by a leveling assembly on the surface of the pile cap base. The upper surface of the pile cap is leveled by the leveling assembly. The connecting steel bars reserved for the pull-out pile pass through the pile cap base and the pile cap and are fixedly connected to the pile cap. Apply cushion layer around the pile cap structure; Cast a flat strip on the upper surface of the cushion layer, with the top of the flat strip flush with the top of the movable member; The prefabricated structural floor is supported by flat strips and the top of the movable member; Insert the hollow anti-pullout connector into the reserved hole of the bottom plate and move the movable component so that the through hole of the movable component is aligned with the reserved hole of the bottom plate, thereby realizing the connection between the hollow anti-pullout connector and the movable component.

9. The construction method of the anti-pullout device for underground prefabricated structure bottom plate according to claim 8, characterized in that: Also includes the following: The sealant liquid is injected through the top of the hollow pull-out connector, flows through the opening of the hollow pull-out connector to between the hollow pull-out connector and the reserved hole of the bottom plate, between the hollow pull-out connector and the through hole of the movable component, and flows to the annular direction of the movable component through the prefabricated pipe in the movable component; In addition, the gap between the pile cap and the flat strip is filled with grouting; Grouting is performed at the top of the hollow pull-out resistant connector in the reserved hole of the base plate to form a post-sealing grouting body.

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