CN115142402B

CN115142402B - Quick-connection prefabricated pile cap for composite foundation and connection method thereof

Info

Publication number: CN115142402B
Application number: CN202210761942.6A
Authority: CN
Inventors: 吴磊磊; 张志峰; 张胜; 陈修和; 赵宇; 赵华宏; 李昊煜; 温广军; 李翻翻; 陈星�
Original assignee: Anhui Transport Consulting and Design Institute Co Ltd; Highway Traffic Energy Saving and Environmental Protection Technology and Equipment Transportation Industry R&D Center
Current assignee: Anhui Transport Consulting and Design Institute Co Ltd; Highway Traffic Energy Saving and Environmental Protection Technology and Equipment Transportation Industry R&D Center
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2023-08-22
Anticipated expiration: 2042-06-30
Also published as: CN115142402A

Abstract

The invention discloses a quick connection precast pile cap for a composite foundation and a connection method thereof, comprising a precast pile cap body, wherein a plurality of connectors and anchor bars are arranged in the precast pile cap body; the connector is provided with internal threads, one end of the connector, which is positioned in the precast pile cap body, is in threaded connection with an anchor reinforcing steel bar, and the other end of the connector is in threaded connection with a plurality of plug-ins; the plug-in components are the shaft-like structure, and the one end of plug-in components is equipped with the second external screw thread with the internal screw thread assorted of connector, and the other end is equipped with concave part and convex part, and during the connection, hoist up the precast pile cap, aim at the connecting hole at the precast pile top of waiting to connect with the plug-in components that will be connected in precast pile cap body, put down the precast pile cap and make the plug-in components get into in the connecting hole, the fastener in connecting hole blocks the concave part of plug-in components, accomplishes the connection promptly. The invention effectively improves the connection quality of the precast pile and the precast pile cap, and has simple connection process and high connection efficiency.

Description

Quick-connection prefabricated pile cap for composite foundation and connection method thereof

Technical Field

The invention relates to the technical field of composite foundations, in particular to a prefabricated pile cap of a composite foundation, and specifically relates to a prefabricated pile cap capable of being quickly connected with a prefabricated pile and a quick connection method of the prefabricated pile cap.

Background

In engineering construction in soft soil foundations, it is generally necessary to perform foundation treatment. In recent years, precast piles typified by tubular piles have been widely used in foundation treatment, and have achieved good treatment effects. When filling a highway or municipal road embankment on a soft soil foundation, a pile cap is usually connected to the pile top of a precast pile so as to transfer more embankment load to a pile body and transfer the embankment load from the pile to the foundation, thereby fully playing the advantage of high strength of precast pile materials.

The pile cap of the precast pile mainly comprises two construction methods of cast-in-situ and prefabrication at present. The cast-in-situ pile cap has the advantages that the pile top welded steel bars are anchored into the pile cap and are connected with the steel bar framework of the pile cap into a whole, and the pile top and the pile cap are integrally poured with concrete through the pile hole, so that good connection performance of the pile top and the pile cap can be ensured, but the cast-in-situ pile cap has the advantages of high labor consumption, high material consumption, low construction speed, low efficiency and high construction quality influenced by human factors during site construction and maintenance.

Prefabricated pile cap is through batch production for labour and resource's utilization efficiency is higher, has avoided more wasting of resources, and product quality has guaranteed, and on-the-spot installation is more convenient, and construction speed is fast, need not the later maintenance simultaneously, its shortcoming lies in: the installation quality of the pile cap is critical, if the pile cap and the pile top cannot be effectively connected, the pile cap is inclined in the construction process, the embankment filling load cannot be effectively transferred to the pile body, and the foundation treatment effect is greatly affected; meanwhile, in the existing connection technology of the prefabricated pile cap and the pile top, a part adopts a hinged mode, namely, only a vertical non-through hole which is matched with the section of the pile is arranged at the bottom of the prefabricated pile cap, the size of the hole is slightly larger than that of the pile, the pile top is placed in the hole during installation, the installation method is simple to operate, but the depth of the pile top embedded into the pile cap is smaller, the integrity of the pile cap and the pile is poor, and if the pile top is filled with soil, the pile cap is easy to rotate along the pile top due to the fact that the operation is not standard; the prefabricated pile cap is provided with two-stage holes, wherein the primary holes are matched with the outer diameter of the pile, the secondary holes are matched with the inner diameter of the pile hole, the primary holes and the secondary holes are connected and penetrate through the height direction of the prefabricated pile cap, the pile top is placed into the primary holes during field installation, concrete is poured into the pile holes through the secondary holes until the top surface of the pile cap is reached, so that the connection effect of the pile cap and the pile is enhanced, but the mode does not completely realize assembly construction, and the pile cap structure has a part of cast-in-situ workload and cannot completely avoid the defects of cast-in-situ pile caps; in addition, the expansion bolts are arranged after the top surface of the tubular pile is drilled, the connecting steel bars are inserted into the reserved holes of the prefabricated pile caps, and the reserved holes are grouted after installation.

From the above, the problems that the existing precast pile cap technology presents in engineering practice mainly include: (1) The connection performance between the prefabricated pile cap and the pile top is poor, and when the load is eccentric, the pile cap is easy to separate from the pile cap or is partially separated from the pile cap; (2) The prefabricated pile cap and the pile top are not completely assembled, and still partial cast-in-situ is needed; (3) When the prefabricated pile cap is connected with the pile top, the connecting process is complex, the working procedures are more, the connecting efficiency is low, and the connection is not convenient enough.

Disclosure of Invention

The invention aims to solve the technical problem of providing the prefabricated pile cap which can effectively improve the connection quality of the prefabricated pile cap and the pile top, is constructed in a full-assembly mode and can be connected with the pile top quickly.

The technical scheme adopted for solving the technical problems is as follows:

the quick connection precast pile cap for the composite foundation comprises a precast pile cap body, wherein a connector and an anchoring steel bar are arranged in the precast pile cap body;

the connector is of a hollow cylindrical structure provided with internal threads;

the number of the connectors is several, and all connectors of the single prefabricated pile cap body are arranged at the same horizontal position;

the bottom surfaces of the connectors are positioned on the bottom surface of the precast pile cap body;

One end of the connector, which is positioned in the precast pile cap body, is connected with an anchoring steel bar;

one end of the anchoring steel bar connected with the connector is provided with a first external thread matched with the internal thread of the connector;

the other end of the anchoring steel bar extends along the thickness direction of the precast pile cap body, and is bent towards the side direction of the precast pile cap body when the anchoring length does not meet the design requirement;

the other end of the connector is connected with a plurality of plug-ins in a threaded manner;

the plug-in is of a rod-shaped structure, one end of the plug-in is provided with a second external thread matched with the internal thread of the connector, and the other end of the plug-in is provided with a concave part and a convex part.

The optimized technical measures also comprise:

when the bottom surface of the precast pile cap body is a plane, the bottom surfaces of the connectors are all positioned on the first bottom surface of the precast pile cap body;

when the bottom surface of the precast pile cap body is a plane containing the reserved hole, the bottom surfaces of the connectors are all positioned on a second bottom surface of the precast pile cap body, and the second bottom surface is the top surface of the reserved hole; the connectors are arranged in a round, square or polygonal shape.

The outer wall of the connector is a smooth round surface or is provided with a third external thread.

The anchor reinforcing bar be screw thread reinforcing bar or smooth round reinforcing bar, the tip that has first external screw thread of anchor reinforcing bar is perpendicular to first external screw thread section reinforcing bar extending direction's plane.

The sum of the length of the first external thread section of the anchoring steel bar and the length of the second external thread section of the insert is not more than the length of the connector.

The internal thread of the connector, the first external thread of the anchoring steel bar, the second external thread of the plug-in unit and the third external thread of the connector are in the form of straight threads or inclined threads.

The number of the plug-in components is the same as the number of the connecting holes of the precast pile tops to be connected, the size and the specification of the plug-in components connected with the same precast pile cap body are the same, and after the plug-in components are connected with the precast pile cap body, the bottom end points of the plug-in components are all located on the same plane.

The top surface of prefabricated pile cap body be equipped with rings, the side of prefabricated pile cap body is equipped with no less than two places first marks, first mark is along the straight line or recess or the fin of vertical extension certain length, the vertical central line of arbitrary first mark, with the vertical axis of arbitrary first mark nearest connector, the vertical axis of prefabricated pile cap body all exist jointly on a vertical plane, the central point of the top surface of prefabricated pile cap body still is provided with the second mark.

The invention also provides a connection method of the quick connection precast pile cap for the composite foundation, which comprises the following steps:

1) Lifting the precast pile cap body by adopting mechanical equipment, spirally connecting one end of the plug-in unit with the second external thread with a connector at the bottom of the precast pile cap body, and enabling the bottom endpoints of all the plug-in units to be positioned on the same horizontal plane after the plug-in unit is connected with the precast pile cap body;

2) A clamping piece is placed in a connecting hole at the top of the precast pile;

3) Leveling the precast pile cap body, slowly moving to the position above the precast pile to be connected, and enabling the position of the plug-in component to be aligned with the position of the connecting hole at the top of the precast pile;

4) Slowly and vertically putting down the prefabricated pile cap body, enabling the plug-in components to enter the connecting holes, and enabling the clamping pieces to clamp the concave parts of the plug-in components or the transition sections of the concave parts and the convex parts to finish connection.

The optimized technical measures also comprise: after the clamping piece is placed in the connecting hole at the top of the precast pile, the epoxy resin can be poured in the connecting hole and on the top surface of the precast pile.

Compared with the prior art, the invention has the beneficial effects that:

(1) The connection performance of the prefabricated pile cap and the pile top is good, the tensile, bending and shearing resistance can be matched according to the design requirements, the performance equivalent to that of the pile body can be achieved, and the prefabricated pile cap and the pile top are prevented from being separated under the eccentric load effect;

(2) The prefabricated pile cap and the pile top are connected completely to realize assembly construction without erecting a mould, casting concrete in situ and curing;

(3) When the prefabricated pile cap is connected with the pile top, the construction process is simple, the procedures are few, and the method is rapid and convenient.

Drawings

Fig. 1 is a three-dimensional perspective view of the whole structure of a precast pile cap body for a quick-connect precast pile cap for a composite foundation (the cross section is circular, the bottom surface is planar, and connectors and anchor bars are circularly arranged).

Fig. 2 is a side perspective view of the whole structure of a precast pile cap body of a quick-connect precast pile cap for a composite foundation (the cross section is circular, the bottom surface is plane, and connectors and anchor bars are circularly arranged) according to the present invention.

Fig. 3 is a bottom view (the cross section is circular, the bottom surface is plane, the connectors are circularly arranged, and the connectors and the anchoring steel bars are circularly arranged) of the precast pile cap body of the quick-connection precast pile cap for the composite foundation.

Fig. 4 is a top perspective view of a precast pile cap body (circular in cross section, planar in bottom surface, circular in arrangement of connectors and anchor bars) of a quick connect precast pile cap for a composite foundation according to the present invention.

Fig. 5 is a schematic three-dimensional structure of a connector for a quick-connect precast pile cap for a composite foundation according to the present invention (the outer wall of the connector is a smooth circle).

Fig. 6 is a side view of an anchor bar (one end of the anchor bar is bent) of a quick connect precast pile cap for a composite foundation according to the present invention.

Fig. 7 is a schematic view showing a butt joint process of a connector for quickly connecting a precast pile cap and an anchor bar for a composite foundation (the outer wall of the connector is a smooth round surface, and one end of the anchor bar is bent).

Fig. 8 is a schematic diagram of a connection completion state of a connector for a quick connection precast pile cap and an anchor bar for a composite foundation (the outer wall of the connector is a smooth round surface, and one end of the anchor bar is bent).

Fig. 9 is a schematic structural view of an insert for a quick connect precast pile cap for a composite foundation according to the present invention.

Fig. 10 is a three-dimensional perspective view (the cross section is circular, the bottom surface is plane, and the connectors are circularly arranged) of the connection process state of the precast pile cap body and the insert of the fast connection precast pile cap for the composite foundation.

Fig. 11 is a side perspective view (circular in cross section, planar in bottom surface, circular in arrangement) of a connection process state of a precast pile cap body and an insert of a fast connection precast pile cap for a composite foundation according to the present invention.

Fig. 12 is a three-dimensional perspective view (circular in cross section, planar in bottom surface, circular in arrangement of connectors) of a connection completion state of a precast pile cap body and an insert for a rapid connection precast pile cap for a composite foundation according to the present invention.

Fig. 13 is a side perspective view (circular in cross section, planar in bottom surface, circular in arrangement) of a connection completion state of a precast pile cap body and an insert for a rapid connection precast pile cap for a composite foundation according to the present invention.

Fig. 14 is a three-dimensional perspective view showing a connection process state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is circular, the bottom surface is plane, the connectors are circularly arranged, and the precast pile is a tubular pile).

Fig. 15 is a side perspective view (the cross section is circular, the bottom surface is plane, the connectors are circularly arranged, and the precast pile is a tubular pile) of the quick connection precast pile cap for the composite foundation according to the present invention.

Fig. 16 is a three-dimensional perspective view showing a connection completion state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is circular, the bottom surface is plane, the connectors are circularly arranged, and the precast pile is a pipe pile) according to the present invention.

Fig. 17 is a side perspective view (the cross section is circular, the bottom surface is plane, the connectors are circularly arranged, and the precast pile is a tubular pile) of the invention in a connection completion state of the fast connection precast pile cap and the precast pile for the composite foundation.

Fig. 18 is a partial side perspective view (circular cross section, flat bottom surface, circular arrangement of connectors, tubular pile) of a connection completion state of a quick connection precast pile cap and precast pile for a composite foundation according to the present invention.

Fig. 19 is a schematic side view of a quick connect precast pile cap (with hanging ring) for composite foundation according to the present invention.

Fig. 20 is a three-dimensional perspective view of the whole structure of the precast pile cap body of the quick-coupling precast pile cap for the composite foundation (the cross section is square, the bottom surface is plane, and the connectors and the anchoring steel bars are arranged in square).

Fig. 21 is a side perspective view of the whole structure of a precast pile cap body for a quick-connect precast pile cap for a composite foundation (the cross section is square, the bottom surface is plane, and connectors and anchor bars are arranged in square).

Fig. 22 is a bottom view of a precast pile cap body (the cross section is square, the bottom surface is plane, the connectors are square, and the connectors and the anchoring steel bars are square) of a quick-connect precast pile cap for a composite foundation according to the present invention.

Fig. 23 is a top perspective view of a precast pile cap body (square in cross section, flat in bottom surface, square in arrangement of connectors and anchor bars) of a quick connect precast pile cap for composite foundation according to the present invention.

Fig. 24 is a three-dimensional perspective view (square in cross section, plane in bottom surface, square in arrangement of connectors) of a connection process state of a precast pile cap body and an insert of a rapid connection precast pile cap for a composite foundation according to the present invention.

Fig. 25 is a side perspective view (square in cross section, plane in bottom surface, square in arrangement) showing a connection process state of a precast pile cap body and an insert of a quick-connect precast pile cap for a composite foundation according to the present invention.

Fig. 26 is a three-dimensional perspective view (square in cross section, plane in bottom surface, square in arrangement of connectors) of a connection completion state of a precast pile cap body and an insert for a rapid connection precast pile cap for a composite foundation according to the present invention.

Fig. 27 is a side perspective view (square in cross section, flat in bottom surface, square in arrangement) of a connection completion state of a precast pile cap body and an insert for a quick-connect precast pile cap for a composite foundation according to the present invention.

Fig. 28 is a three-dimensional perspective view showing a connection process state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface is plane, the connectors are square, and the precast pile is a square pile).

Fig. 29 is a side perspective view showing a connection process state of a quick connection precast pile cap and a precast pile for a composite foundation according to the present invention (the cross section is square, the bottom surface is plane, the connectors are arranged in a square shape, and the precast pile is a square pile).

Fig. 30 is a three-dimensional perspective view showing a connection completion state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface is plane, the connectors are square, and the precast pile is a square pile) according to the present invention.

Fig. 31 is a side perspective view showing a connection completion state of a quick connection precast pile cap and a precast pile for a composite foundation according to the present invention (the cross section is square, the bottom surface is plane, the connectors are arranged in a square shape, and the precast pile is a square pile).

Fig. 32 is a partial side perspective view showing a connection completion state of a quick-connection precast pile cap and a precast pile for a composite foundation according to the present invention (the cross section is square, the bottom surface is plane, the connectors are arranged in a square shape, and the precast pile is a square pile).

Fig. 33 is a three-dimensional perspective view of the whole structure of the precast pile cap body of the quick-coupling precast pile cap for the composite foundation according to the present invention (the cross section is square, the bottom surface is plane, and the connectors and the anchoring reinforcement are circularly arranged).

Fig. 34 is a side perspective view (square in cross section and flat in bottom surface) of the overall structure of the precast pile cap body of the quick connect precast pile cap for composite foundation according to the present invention.

Fig. 35 is a bottom view (square in cross section, flat in bottom surface, circular in arrangement) of a precast pile cap body for a quick connect precast pile cap for a composite foundation according to the present invention.

Fig. 36 is a top perspective view of a precast pile cap body (square in cross section, flat in bottom surface, circular in arrangement of connectors and anchor bars) of a quick connect precast pile cap for composite foundation according to the present invention.

Fig. 37 is a three-dimensional perspective view (square in cross section, flat in bottom surface, circular in arrangement) showing the connection process state of the precast pile cap body and the insert of the fast-connection precast pile cap for the composite foundation according to the present invention.

Fig. 38 is a side perspective view (square in cross section, flat in bottom surface, circular in arrangement) showing the connection process state of the precast pile cap body and the insert for the rapid connection precast pile cap for the composite foundation according to the present invention.

Fig. 39 is a three-dimensional perspective view (square in cross section, flat in bottom surface, circular in arrangement) of the connection completion state of the precast pile cap body and the insert for the rapid connection precast pile cap for the composite foundation according to the present invention.

Fig. 40 is a side perspective view (square in cross section, flat in bottom surface, circular in arrangement) of a connection completion state of a precast pile cap body and an insert for a quick-connect precast pile cap for a composite foundation according to the present invention.

Fig. 41 is a three-dimensional perspective view showing a connection process state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface is plane, the connectors are circularly arranged, and the precast pile is a tubular pile).

Fig. 42 is a three-dimensional perspective view showing a connection completion state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface is plane, the connectors are circularly arranged, and the precast pile is a pipe pile) according to the present invention.

Fig. 43 is a three-dimensional perspective view showing a connection process state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface is plane, the connectors are circularly arranged, and the precast pile is a square pile).

Fig. 44 is a three-dimensional perspective view showing a connection completion state of a rapid connection precast pile cap and a precast pile for a composite foundation according to the present invention (the cross section is square, the bottom surface is plane, the connectors are circularly arranged, and the precast pile is a square pile).

Fig. 45 is a three-dimensional perspective view of the whole structure of the precast pile cap body of the quick-connect precast pile cap for the composite foundation (the cross section is square, the bottom surface comprises preformed holes, and the connectors and the anchoring steel bars are circularly arranged).

Fig. 46 is a side perspective view of the overall structure of a precast pile cap body for a quick connect precast pile cap for a composite foundation according to the present invention (the cross section is square, the bottom surface includes preformed holes, and the connectors and anchor bars are circularly arranged).

Fig. 47 is a schematic three-dimensional structure of a connector for a quick-connect precast pile cap for a composite foundation according to the present invention (the outer wall of the connector is provided with external threads).

Fig. 48 is a schematic view showing a butt joint process of a connector for a quick connection precast pile cap and an anchor bar for a composite foundation according to the present invention (an external thread is provided on an outer wall of the connector, and one end of the anchor bar is bent).

Fig. 49 is a schematic view showing a connection completion state of a connector for a quick-connection precast pile cap and an anchor bar for a composite foundation according to the present invention (an external thread is provided on an outer wall of the connector, and one end of the anchor bar is bent).

Fig. 50 is a three-dimensional perspective view showing a connection process state of a precast pile cap body and an insert for a fast connection precast pile cap for a composite foundation according to the present invention (the cross section is square, the bottom surface includes a preformed hole, and the connectors and the anchoring reinforcing bars are circularly arranged).

Fig. 51 is a side perspective view (square in cross section, with preformed holes in the bottom, and circular in arrangement of connectors and anchor bars) of a coupling process of a precast pile cap body and an insert for a quick coupling precast pile cap for a composite foundation according to the present invention.

Fig. 52 is a three-dimensional perspective view of a connection completion state of a precast pile cap body and an insert for a rapid connection precast pile cap for a composite foundation according to the present invention (the cross section is square, the bottom surface includes a preformed hole, and the connectors and the anchoring reinforcement are circularly arranged).

Fig. 53 is a side perspective view (square in cross section, with preformed holes in the bottom, and circular in arrangement of connectors and anchor bars) of a connection completion state of a precast pile cap body and an insert for a quick connect precast pile cap for a composite foundation according to the present invention.

Fig. 54 is a three-dimensional perspective view showing a connection process state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface comprises preformed holes, connectors and anchoring steel bars are circularly arranged, and the precast pile is a tubular pile).

Fig. 55 is a side perspective view showing a connection process state of a quick connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface comprises preformed holes, connectors and anchoring steel bars are circularly arranged, and the precast pile is a tubular pile).

Fig. 56 is a three-dimensional perspective view showing a connection completion state of a quick connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface comprises preformed holes, connectors and anchoring reinforcing steel bars are circularly arranged, and the precast pile is a tubular pile).

Fig. 57 is a side perspective view showing a connection completion state of a quick connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface comprises preformed holes, connectors and anchoring reinforcing steel bars are circularly arranged, and the precast pile is a tubular pile) according to the present invention.

Fig. 58 is a three-dimensional perspective view of the overall structure of a precast pile cap body for a quick connect precast pile cap for a composite foundation according to the present invention (the cross section is square, the bottom surface includes preformed holes, and the connectors and anchor bars are circularly arranged).

Fig. 59 is a three-dimensional perspective view showing a connection process state of a precast pile cap body and an insert for a fast connection precast pile cap for a composite foundation according to the present invention (the cross section is square, the bottom surface includes a preformed hole, and the connectors and the anchoring reinforcement are circularly arranged).

Fig. 60 is a three-dimensional perspective view of a connection completion state of a precast pile cap body and an insert for a rapid connection precast pile cap for a composite foundation according to the present invention (the cross section is square, the bottom surface includes a preformed hole, and the connectors and the anchoring reinforcement are circularly arranged).

Fig. 61 is a three-dimensional perspective view showing a connection process state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface comprises preformed holes, connectors and anchoring steel bars are circularly arranged, and the precast pile is a tubular pile).

Fig. 62 is a three-dimensional perspective view showing a connection completion state of a rapid connection precast pile cap and a precast pile for a composite foundation (the cross section is square, the bottom surface comprises preformed holes, connectors and anchoring reinforcing steel bars are circularly arranged, and the precast pile is a tubular pile).

Fig. 63 is a side view of an anchor bar (anchor bar straight) of a quick connect precast pile cap for a composite foundation according to the present invention.

Fig. 64 is a schematic view showing a butt joint process of a connector for a quick connection precast pile cap and an anchor bar for a composite foundation according to the present invention (the outer wall of the connector is a smooth circular surface, and the anchor bar is straight).

Fig. 65 is a schematic view showing a butt-joint completion state of a connector for a quick-connection precast pile cap and an anchor bar for a composite foundation (the outer wall of the connector is a smooth round surface, and the anchor bar is straight).

Fig. 66 is a schematic view showing a butt joint process of a connector for quickly connecting a precast pile cap and an anchor bar for a composite foundation (the outer wall of the connector is a smooth round surface, and one end of the anchor bar is provided with a hook).

Fig. 67 is a schematic view showing a connection completion state of a connector for a quick connection precast pile cap and an anchor bar for a composite foundation (the outer wall of the connector is a smooth round surface, and one end of the anchor bar is provided with a hook).

Fig. 68 is a three-dimensional perspective view of the whole structure of the precast pile cap body of the quick-coupling precast pile cap for the composite foundation (the cross section is circular, the bottom surface is plane, the connectors and the anchoring steel bars are circularly arranged, the side surfaces are provided with first marks, and the top surface is provided with second marks).

Fig. 69 is a top perspective view of a precast pile cap body for a quick connect precast pile cap for a composite foundation according to the present invention (the cross section is circular, the bottom surface is planar, the connectors and the anchor bars are circularly arranged, the side surfaces are provided with first marks, and the top surface is provided with second marks).

Reference numerals: 1-prefabricating a pile cap body; 11-a first bottom surface; 12-preformed holes; 13-a second bottom surface; a 2-connector; 21-internal threads; 22-third external threads; 3-anchoring the steel bars; 31-first external threads; 4-inserts; 41-second external threads; 42-recess; 43-convex; 5-connecting holes; 6-hanging rings; 7-a first marker; 8-second label.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples to more clearly and completely describe the technical aspects of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. The following description of at least one embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, other embodiments that may be obtained by those of ordinary skill in the art without making any inventive effort are within the scope of the present invention. The relative positions, numbers, and dimensions of the components and steps set forth in these examples are not limiting on the scope of the invention unless specifically stated otherwise.

For ease of description, spatially relative terms, such as "perpendicular to," "horizontal to," "above," and the like, are used in embodiments to describe one component or feature's spatial relationship to another component or feature's spatial relationship as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation of the component depicted in the figures.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inner", "outer wall", "horizontal", "inner", "outer", "one end", "the other end", "the extreme end", "bottom face", "top face", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of description and simplification of the description, and are not indicative or implying that the parts to be referred to must have a specific direction, be configured and operated in a specific direction, and in addition, for convenience of description, the vertical direction and the horizontal direction are two by two vertical directions, and the two directions in the vertical direction are the up and down directions, respectively.

Example 1:

as shown in fig. 1 to 4, the quick-connection precast pile cap for the composite foundation comprises a precast pile cap body with a circular cross section, wherein connectors and anchoring steel bars are arranged in the precast pile cap body.

As shown in fig. 5, the connector has a hollow cylindrical structure with internal threads, and the outer wall of the connector is a smooth circular surface.

As shown in fig. 1 to 3, the number of the connectors is several, and all the connectors of the single precast pile cap body are circularly arranged at the same horizontal position, that is, the centers of all the connectors are all located on the circumference of the same circle. The number of connectors is generally the same as the number of connection holes to be connected to the pile top of the precast pile.

As shown in fig. 1 to 3, the bottom surface of the precast pile cap body is a plane, and the bottom surfaces of the connectors are all located on the first bottom surface of the precast pile cap body. Because the connection quality requirement of the precast pile cap and the precast pile is high, part of the prior art is that the bottom surface of the precast pile cap comprises a preformed hole so as to anchor the precast pile into the precast pile cap for a certain depth; the other part of the prior art is that the precast pile cap body comprises a vertically through hole for the anchor bolt of later construction to pass through. According to the invention, through an effective connecting means, a preformed hole is not required to be arranged in the precast pile cap body, and a vertically through hole is not required to be reserved in the precast pile cap body.

As shown in fig. 1 to 2, one end of the connector located inside the precast pile cap body is connected with an anchor bar to prevent the rapid connection structure of the precast pile cap and the precast pile from being failed in special cases.

As shown in fig. 6 to 7, the end of the anchoring bar connected to the connector is provided with a first external thread matching with the internal thread of the connector. The state of the anchor bar after screw connection with the connector is shown in fig. 8.

As shown in fig. 1, 2 and 6, the other end of the anchoring bar extends along the thickness direction of the precast pile cap body, and then bends towards the side edge direction of the precast pile cap body.

As shown in fig. 9 to 13, the other end of the connector is screwed with a plurality of inserts.

As shown in fig. 9, the insert has a rod-shaped structure, one end of the insert is provided with a second external thread matched with the internal thread of the connector, and the other end of the insert is provided with a concave part which is concave relative to the rod body of the insert and a convex part which is convex.

In order to further optimize the quick connection precast pile cap for the composite foundation, in the embodiment, the following steps are adopted:

as shown in fig. 6 to 7, the anchoring bar is a twisted bar, and the end of the anchoring bar having the first external thread is a plane perpendicular to the extending direction of the first external thread section bar. In order to furthest utilize the connection performance of the internal thread section of the connector, the threaded end part of the anchoring steel bar is a plane vertical to the extending direction of the steel bar, so that enough space is reserved, and the plug-in unit and the prefabricated pile cap body have enough spiral connection length, thereby ensuring the connection quality of the plug-in unit.

The sum of the length of the first external thread section of the anchoring steel bar and the length of the second external thread section of the insert is not greater than the length of the connector. To reduce the amount of work required to tap the ends of the anchor bar and insert, the sum of the length of the first externally threaded section of the anchor bar and the length of the second externally threaded section of the insert can generally be equal to or slightly less than the length of the connector.

The bending section of the anchoring steel bar can be bound and connected with the steel bar net sheet arranged in the precast pile cap body to form an integral steel bar framework of the precast pile cap body, so that the connector and the steel bar net sheet are convenient to position, and the precast pile cap body is also convenient to produce.

The internal thread of the connector, the first external thread of the anchoring steel bar, the second external thread of the plug-in unit and the third external thread of the connector are in the form of straight threads or inclined threads. The form of the thread can be selected according to engineering requirements or convenience in processing, and the form can be diversified, specifically, the requirement of connection performance is met.

As shown in fig. 14 to 18, the number of the inserts is the same as the number of the connecting holes of the pile tops of the precast piles to be connected, the sizes and specifications of the inserts connected with the same precast pile cap body are the same, and after the inserts are connected with the precast pile cap body, the bottom end points of the inserts are all located on the same plane. The components arranged in the same prefabricated pile cap are suitable for being uniform in specification and dimension, so that the quick connection prefabricated pile cap for the composite foundation is convenient to manufacture; meanwhile, the number of the plug-in components connected with the bottom surface of the pile cap is the same as the number of the connecting holes of the precast pile tops to be connected, the positions and the distribution of the plug-in components are also suitable for the connecting holes of the precast pile tops to be connected, and the precast pile caps and the precast pile tops are convenient to quickly connect.

Further, in order to facilitate lifting and installation, as shown in fig. 19, a lifting ring is provided on the top surface of the precast pile cap body.

The hanging ring can be fixed, namely, the hanging ring and the embedded part or the embedded rib are fixedly connected into an integrated structure, and the hanging ring protrudes above the top surface of the precast pile cap body after being molded.

The hanging ring can also be arranged to be movable, namely the hanging ring is not fixedly connected with the embedded part or the embedded rib of the hanging ring, preferably, the threaded connection type embedded part of the hanging ring comprises the embedded rib and the steel bar connecting sleeve, and the top surface of the steel bar connecting sleeve is flush with the top surface of the precast pile cap body. The embedded bars are connected with the steel bar connecting sleeve through threads, after the prefabricated pile cap body is formed, the sections of the outer threaded rods arranged at the bottoms of the lifting rings are screwed into the steel bar connecting sleeve before lifting, and then the quick connection of the lifting rings is achieved. When the prefabricated pile cap body is transported or stacked, the hanging ring can be unscrewed, so that the prefabricated pile cap body is convenient to transport and stack. After the installation of the prefabricated pile cap body is finished on site, the hanging ring can be unscrewed, and recycling and repeated utilization are realized. In order to prevent sundries from entering the steel bar connecting sleeve on the top surface of the precast pile cap body, a threaded plug can be temporarily installed when the hanging ring is not connected.

The embodiment is most suitable for the condition that the cross section of the precast pile to be connected is circular or annular, including but not limited to various prestressed concrete pipe piles, special-shaped piles, stiffness bodies, cast-in-situ large-diameter pipe piles and solid column piles. In order to fully exert the function of the soil arch and enable more load to be transferred to the pile body, the composite foundation pile caps are generally arranged according to a certain rule and mainly in square, rectangular and regular triangle arrangement modes according to design requirements. When the cross section of the precast pile to be connected is circular or circular, the position of the connecting hole of the pile top of the precast pile to be connected is uncertain because the pile body is not specially regulated to be in a fine position when sinking into a foundation during construction, when the precast pile cap is connected quickly, the cross section of the pile cap is circular, the distribution of the connecting holes of the pile top after construction can be well matched, the plug-in unit is aligned and inserted into the connecting holes, the connection is completed quickly, the connection strength is high, the connection quality is reliable, and the pile cap is regularly distributed along with the arrangement of the plane position of the pile body all the time.

The embodiment is also suitable for the situation that the cross section of the precast pile to be connected is square, but the connecting line of the central line of the pile top connecting hole is round, including but not limited to various hollow square piles and solid square piles. When the pile is constructed, the plane position of the square pile is usually provided with a certain directivity according to the design position, even if the pile is in certain deviation during construction, when the pile cap is quickly connected with the prefabricated pile cap, the cross section of the pile cap is round, the distribution of connecting holes of the pile top after construction can be well matched, after the plug-in components are aligned with the connecting holes, the plug-in components are clamped, and the pile cap is regularly distributed along with the arrangement of the plane position of the pile body all the time.

Example 2:

as shown in fig. 20 to 23, the quick-connection precast pile cap for the composite foundation of the present invention comprises a precast pile cap body with a square cross section, wherein connectors and anchor bars are arranged in the precast pile cap body.

As shown in fig. 20 to 23, the number of connectors is several, and all connectors of a single precast pile cap body are square arranged at the same horizontal position.

As shown in fig. 20 to 22, the bottom surface of the precast pile cap body is a plane, and the bottom surfaces of the connectors are all located on the first bottom surface of the precast pile cap body.

As shown in fig. 20 and 21, one end of the connector, which is located inside the precast pile cap body, is connected with an anchor bar.

As shown in fig. 6 to 7, the anchoring steel bar is screw-thread steel, and one end of the anchoring steel bar connected with the connector is provided with a first external thread matched with the internal thread of the connector; the state of the anchor bar after screw connection with the connector is shown in fig. 8.

As shown in fig. 20, 21 and 6, the other end of the anchoring bar extends along the thickness direction of the precast pile cap body, and is bent up towards the side direction of the precast pile cap body;

As shown in fig. 24 to 27, the other end of the connector is spirally connected with a plurality of inserts;

as shown in fig. 9, the insert has a rod-shaped structure, one end of the insert is provided with a second external thread matched with the internal thread of the connector, and the other end of the insert is provided with a concave part which is concave relative to the rod body of the insert and a convex part which is convex;

the threaded end part of the anchoring steel bar is a plane vertical to the extending direction of the steel bar.

The sum of the length of the first external thread section of the anchoring steel bar and the length of the second external thread section of the insert is not greater than the length of the connector.

As shown in fig. 28 to 32, the number of the inserts is the same as the number of the connecting holes of the pile tops of the precast piles to be connected, the sizes and specifications of the inserts connected with the same precast pile cap body are the same, and after the inserts are connected with the precast pile cap body, the bottom end points of the inserts are all located on the same plane.

In order to facilitate lifting and installation, the top surface of the prefabricated pile cap body is provided with a lifting ring.

The embodiment is most suitable for the situation that the cross section of the precast pile to be connected is square, and the connecting line of the central line of the pile top connecting hole is square, including but not limited to various hollow square piles and solid square piles. When the prefabricated square pile is produced, the main ribs are arranged according to the square shape, so that the corresponding pile top connecting holes are also arranged in the square shape. When the quick-connection prefabricated pile cap is adopted, the cross section of the pile cap is square, and connectors are square and are arranged at the same horizontal plane position, so that distribution of connecting holes of the pile top after construction can be well matched, plug-in components are aligned and inserted into the connecting holes, and then the quick-connection prefabricated pile cap is plugged in and quickly connected, high in connection strength and reliable in connection quality, and the pile cap is regularly distributed along with arrangement of the plane positions of the pile body all the time.

Example 3:

as shown in fig. 33 to 36, the quick-connection precast pile cap for the composite foundation of the present invention comprises a precast pile cap body with a square cross section, wherein connectors and anchor bars are arranged in the precast pile cap body.

As shown in fig. 33 to 36, the number of connectors is several, and all connectors of a single precast pile cap body are circularly arranged at the same horizontal position.

As shown in fig. 33 to 35, the bottom surface of the precast pile cap body is a plane, and the bottom surfaces of the connectors are all located on the first bottom surface of the precast pile cap body.

As shown in fig. 33 and 34, one end of the connector, which is positioned in the precast pile cap body, is connected with an anchor bar;

As shown in fig. 33, 34 and 6, the other end of the anchoring bar extends along the thickness direction of the precast pile cap body, and is bent up towards the side direction of the precast pile cap body;

as shown in fig. 37 to 40, the other end of the connector is spirally connected with a plurality of inserts;

As shown in fig. 41 to 42, the number of the inserts is the same as the number of the connecting holes of the pile tops of the precast piles to be connected, the sizes and specifications of the inserts connected with the same precast pile cap body are the same, and after the inserts are connected with the precast pile cap body, the bottom end points of the inserts are all located on the same plane.

The embodiment is suitable for the condition that the cross section of the precast pile to be connected is circular or annular, including but not limited to various prestressed concrete pipe piles, special-shaped piles, stiffness bodies, cast-in-situ large-diameter pipe piles and solid column piles. When the cross section of the precast pile to be connected is circular or annular, the main ribs are generally arranged in a circular shape, so that the corresponding pile top connecting holes are also arranged in a circular shape. At this time, a guide mark is required to be set at the pile top position so that the pile body position is coordinated with the line type of the route when the pile is sunk into the foundation. When the quick connection prefabricated pile cap of the embodiment is adopted, the cross section of the pile cap is square, the connectors are circularly arranged at the same horizontal plane position, the distribution of connecting holes of the pile top after construction can be well matched, after the plug-in is aligned with the connecting holes, clamping connection is completed, and the pile cap is also distributed regularly along with the arrangement of the plane positions of the pile body correspondingly.

As shown in fig. 43 and 44, the present embodiment is also applicable to the case where the cross section of the precast pile to be connected is square, but the connecting line of the center line of the pile top connecting hole is circular, including but not limited to various hollow square piles and solid square piles. When the square pile is constructed, the plane position of the square pile is usually provided with a certain directivity according to the design position, even if the plane position of the square pile has a certain deviation in construction, when the prefabricated pile cap is quickly connected, the distribution of connecting holes of the pile top after construction can be well matched, the plug-in units are aligned and inserted into the connecting holes, the connection is quickly completed, the connection strength is high, the connection quality is reliable, and the pile cap is regularly distributed along with the arrangement of the plane position of the pile body.

Example 4:

as shown in fig. 45 to 46, the quick-connection precast pile cap for the composite foundation of the present invention comprises a precast pile cap body with a circular cross section, wherein connectors and anchor bars are arranged in the precast pile cap body.

As shown in fig. 47, the connector has a hollow cylindrical structure provided with internal threads, and the outer wall of the connector is provided with threads.

As shown in fig. 45 to 46, the number of connectors is several, and all connectors of a single precast pile cap body are circularly arranged at the same horizontal position.

As shown in fig. 45 to 46, the bottom surface of the precast pile cap body is a plane containing the preformed hole, the bottom surfaces of the connectors are all located on the second bottom surface of the precast pile cap body, and the second bottom surface is the top surface of the preformed hole. The preformed hole is cylindrical, and the diameter of the preformed hole is preferably 2mm to 10mm larger than the outer diameter of the tubular pile so as to facilitate the insertion of the pile top into the preformed hole.

As shown in fig. 44 to 45, an anchor bar is connected to one end of the connector located inside the precast pile cap body.

As shown in fig. 48, the anchoring steel bar is screw-thread steel, and one end of the anchoring steel bar connected with the connector is provided with a first external thread matched with the internal thread of the connector; the state of the anchor bar after screw connection with the connector is shown in fig. 49.

As shown in fig. 44 to 45, the other end of the anchoring bar extends in the thickness direction of the precast pile cap body, and is bent up in the lateral direction of the precast pile cap body when the anchoring length does not meet the design requirement.

As shown in fig. 50 to 53, the other end of the connector is screwed with a plurality of inserts.

As shown in fig. 54 to 57, the number of the inserts is the same as the number of the connecting holes of the pile tops of the precast piles to be connected, the sizes and specifications of the inserts connected with the same precast pile cap body are the same, and after the inserts are connected with the precast pile cap body, the bottom end points of the inserts are all located on the same plane.

In this embodiment, the bottom surface of the prefabricated pile cap body is provided with a preformed hole, which is particularly suitable for the situation that the requirement on the connection effect of the pile top and the pile cap is very high, the preformed hole can be used as a safety reserve, and the pile top of the pile cap edge can be prevented from deflecting or generating larger horizontal displacement under the extreme conditions of corrosion, fracture and the like of the insert, and other advantages are the same as those of the previous embodiment.

In addition to the above embodiments, in other embodiments, the quick-connect precast pile cap for a composite foundation according to the present invention may be configured such that the cross section of the precast pile cap body is circular or square, the connectors are arranged in a circular or square or polygonal shape, the outer wall of the connectors is smooth or provided with threads, the bottom surface of the precast pile cap body is a plane or a plane containing a preformed hole, the end of the anchoring reinforcement is bent or not bent or provided with a hook, the anchoring reinforcement is a twisted reinforcement or a plain round reinforcement, and the quick-connect precast pile cap for a composite foundation according to the present invention may be freely combined according to engineering requirements, and in addition, the size of the pile cap, the number of connectors, the size and specification of the connectors, the diameter and length of the anchoring reinforcement, the size and number of the connectors, and the size of the inserts of the precast pile cap body may be designed according to engineering requirements, and any combination of the foregoing forms belong to the implementation of the quick-connect precast pile cap for a composite foundation according to the present invention. When the end part of the anchoring steel bar is not bent, the top part of the anchoring steel bar can be in spot welding connection with the steel bar net sheet of the prefabricated pile cap body; when the hooks are arranged at the end parts of the anchoring reinforcing steel bars, the hooks hook reinforcing steel bars of the reinforcing steel bar net sheets of the precast pile cap body.

As shown in fig. 58 to 62, the cross section of the precast pile cap body of embodiment 4 may also be circular.

As shown in fig. 63 to 65, the end portions of the anchor bars may not be bent.

As shown in fig. 66 to 67, the end of the anchor bar may be provided with hooks. When the hooks are arranged, the hooks can hook the steel bars on the steel bar net sheet of the precast pile cap body, so that the anchoring performance of the plug-in unit and the connector is improved, and the connection failure of the precast pile cap caused by the fact that the embedded part is pulled out under special conditions is avoided.

In other embodiments, the anchoring bars, connectors, inserts of the present patent may be combined. For example, the anchoring bars and the connector may be made in one piece, but still comprise an anchoring section and a connecting section, the inside of the connecting section being hollow and provided with internal threads, and the insert may be screwed into the structure. In addition, the anchoring steel bar, the connector and the plug-in can be integrally manufactured, at the moment, the connector is omitted, and after the prefabricated pile cap is manufactured, the plug-in is in a state of being installed in place, and the pile cap can be directly connected with the pile top on site.

68-69, in other embodiments, to facilitate the butt joint of the insert and the connection hole of the pile top, at least two first marks are arranged on the side surface of the pile top, and the first marks are straight lines or grooves or ribs extending a certain length along the vertical direction; the vertical central line of any one of the first marks, the vertical central line of one of the connectors on the bottom surface of the precast pile cap body and the vertical central line of the precast pile cap body coexist on a vertical plane.

In other embodiments, the center point of the top surface of the precast pile cap body is provided with a second mark.

The connecting method of the embodiment of the invention for quickly connecting the prefabricated pile caps for the composite foundation comprises the following steps:

3) Leveling the precast pile cap body, slowly moving to the position above the precast pile to be connected, and enabling the position of the plug-in component to be accurately aligned with the position of the connecting hole at the top of the precast pile;

4) Slowly putting down the prefabricated pile cap body, enabling the plug-in components to enter the connecting holes, enabling the clamping pieces to clamp the concave parts of the plug-in components, and completing connection.

In order to further optimize the connecting method for the quick connecting precast pile cap for the composite foundation, after the clamping piece is placed in the connecting hole at the top of the precast pile, epoxy resin can be poured into the connecting hole and the top surface of the precast pile. After the plug-in is inserted into the connecting hole to complete connection, the epoxy resin is solidified along with the time, so that the plug-in and the clamping piece can be protected, corrosion is prevented, the connecting strength is improved, and the connecting gap is reduced.

After the composite foundation is connected with the precast pile through the quick connection precast pile cap, a bearing structure consisting of the precast pile cap body, the plug-in components, the clamping pieces and the precast pile is formed, and when only bearing the axial vertical force, the load is directly transmitted to the precast pile by the precast pile cap body; when vertical load is eccentric, bear horizontal force or bear the pull-up force, precast pile cap body, plug-in components, fastener, precast pile atress jointly, mainly show that the load of pulling the side is transmitted to the plug-in components by the pile cap, then is transmitted to the fastener by the plug-in components, and then is transmitted to the precast pile by the fastener, consequently can guarantee precast pile cap and precast pile's connection quality, avoid precast pile cap edge pile top to rotate or throw off.

In addition, because the diameter or side length of the precast pile for the composite foundation is generally 300mm to 500mm, and the diameter or side length of the precast pile cap for the composite foundation is generally 1000mm to 1500mm, the size of the precast pile cap is obviously larger than the section of the precast pile, the pile top is basically clung to the ground after the precast pile for the composite foundation is constructed, when the precast pile cap is in butt joint with the precast pile, the sight is blocked by the precast pile cap with relatively larger upper size, and on-site constructors cannot directly observe the butt joint condition of the insert and the connecting hole, on one hand, the center of the pile cap is difficult to align with the center of the precast pile, and on the other hand, the alignment of the insert and the connecting hole is more difficult, and in order to further optimize the connecting method for the quick connecting precast pile cap for the composite foundation, the positions of the insert can be aligned with the connecting hole at the top of the precast pile according to the following steps:

(1) Preparation work

1) Arranging first marks on the side surface of the precast pile cap body, wherein the first marks are straight lines or grooves or ribs which extend a certain length along the vertical direction, and the number of the first marks is not less than two, and generally can be two;

2) And setting a second mark at the center point of the top surface of the precast pile cap body.

(2) In situ operation

1) Placing a plurality of laser perpendiculars around the precast pile to be connected, and enabling the positions of the laser perpendiculars to be positioned on an extension line of a connecting line between the center of the precast pile and the center of a pile top connecting hole, wherein the number of the laser perpendiculars is not less than two;

2) Setting the height of a laser emission point of a laser vertical instrument to enable the height of the laser emission point to be larger than the height of the top surface of the pile cap when the installation of the prefabricated pile cap body is completed;

3) Starting a laser vertical instrument to enable the laser vertical instrument to emit laser, wherein the laser forms a horizontal laser line at the pile top position through the center of the precast pile and the center of the pile top connecting hole;

4) Starting other laser perpendiculars, repeating the step 3), and intersecting a plurality of horizontal laser lines at a first intersection point, wherein the first intersection point is the center of the cross section of the top of the precast pile;

5) Lifting the prefabricated pile cap body with the plug-in units connected by mechanical equipment, and adjusting the top surface to be in a horizontal state;

6) Slowly and horizontally moving the precast pile cap body to the position above the precast pile, wherein the laser emitted by each laser vertical instrument forms a vertical laser line on the side surface of the precast pile cap body and extends to the top surface of the precast pile cap body, and forms a horizontal laser line on the top surface of the precast pile cap body; the horizontal laser lines on the top surface of the precast pile cap are intersected at a second intersection point;

7) Accurately adjusting the horizontal position of the prefabricated pile cap body to enable a second mark of the center point of the top of the pile cap to coincide with a second intersection point;

8) Horizontally rotating the prefabricated pile cap body to enable the vertical laser line on the side surface of the prefabricated pile cap body to coincide with a second mark arranged on the side surface, and thus the alignment of the plug-in unit and the connecting hole is completed;

9) And slowly and vertically putting down the prefabricated pile cap body, accurately entering the connecting hole by the plug-in unit, and clamping the concave part or the transition section of the concave part and the convex part of the plug-in unit by the clamping piece to complete quick connection.

In the present invention, features are not necessarily independently present unless explicitly stated or defined. The foregoing description and description contain the basic principles, main features and advantages of the present invention. Those skilled in the art will appreciate that the present invention is not limited to the embodiments described above, which are provided as preferred examples of the present invention and are not intended to limit the present invention as the only option. The invention may be further modified and optimized within the spirit and scope of the invention as defined by the appended claims, along with the full scope of equivalents to which such modifications and optimization are to be entitled.

Claims

1. The quick-connection precast pile cap for the composite foundation is characterized by comprising a precast pile cap body (1), wherein a connector (2) and an anchor reinforcing steel bar (3) are arranged in the precast pile cap body (1);

the connector (2) is of a hollow cylindrical structure provided with an internal thread (21);

the number of the connectors (2) is several, and all the connectors (2) of the single prefabricated pile cap body (1) are arranged at the same horizontal position;

the bottom surfaces of the connectors (2) are positioned on the bottom surface of the precast pile cap body;

one end of the connector (2) positioned in the precast pile cap body (1) is connected with an anchor reinforcing steel bar (3);

one end of the anchoring steel bar (3) connected with the connector (2) is provided with a first external thread (31) matched with the internal thread (21) of the connector (2);

the other end of the anchoring steel bar (3) extends along the thickness direction of the precast pile cap body (1), and is bent towards the side direction of the precast pile cap body (1) when the anchoring length does not meet the design requirement;

the other end of the connector (2) is connected with a plurality of inserts (4) in a threaded manner;

the plug-in unit (4) is in a rod-shaped structure, one end of the plug-in unit (4) is provided with a second external thread (41) matched with the internal thread (21) of the connector (2), and the other end of the plug-in unit (4) is provided with an inward concave part (42) and an outward convex part (43);

The top surface of the prefabricated pile cap body (1) is provided with a hanging ring (6), the side surface of the prefabricated pile cap body (1) is provided with at least two first marks (7), the first marks (7) are straight lines or grooves or ribs which extend vertically for a certain length, the vertical central line of any one first mark (7), the vertical central line of one connector (2) nearest to any one first mark (7) and the vertical central line of the prefabricated pile cap body (1) are all coexisted on a vertical plane, and the central point of the top surface of the prefabricated pile cap body (1) is also provided with a second mark (8);

the position of the plug-in component is aligned with the connecting hole at the top of the precast pile:

8) And horizontally rotating the precast pile cap body to enable the vertical laser line on the side surface of the precast pile cap body to coincide with the first mark arranged on the side surface, and thus, the alignment of the plug-in components and the connecting holes is completed.

2. A quick connect precast pile cap for composite foundations according to claim 1, characterized in that the connectors (2) are arranged in a circular, square or polygonal shape.

3. The quick connect precast pile cap for composite foundation according to claim 1, characterized in that the outer wall of the connector (2) is a smooth round surface or is provided with a third external thread (22).

4. A quick connect precast pile cap for composite foundations according to claim 3, characterized in that the thread forms of the internal thread (21) of the connector (2), the first external thread (31) of the anchor bar (3), the second external thread (41) of the insert (4) and the third external thread (22) of the connector (2) are straight threads or oblique threads.

5. The quick-connect precast pile cap for composite foundations according to claim 1, wherein the anchor bars (3) are screw bars or smooth round bars, and the end parts of the anchor bars (3) with the first external threads (31) are planes perpendicular to the extending direction of the first external thread (31) section bars.

6. The quick connect precast pile cap for composite foundations according to claim 1, wherein the sum of the length of the first external thread (31) section of the anchor bar (3) and the length of the second external thread (41) section of the insert (4) is not greater than the length of the connector (2).

7. The quick-connection precast pile cap for the composite foundation according to claim 1, wherein the number of the inserts (4) is the same as the number of the connecting holes (5) of the pile tops of the precast piles (A) to be connected, the sizes and the specifications of the inserts (4) connected with the same precast pile cap body (1) are the same, and after the inserts (4) are connected with the precast pile cap body (1), the bottom end points of the inserts (4) are all located on the same plane.

8. A method of connecting a composite foundation quick connect precast pile cap as claimed in any one of claims 1 to 7, comprising the steps of:

1) Lifting the precast pile cap body (1) by adopting mechanical equipment, spirally connecting one end of the plug-in unit (4) with the second external thread (41) with the connector (2) at the bottom of the precast pile cap body (1), and enabling the bottom endpoints of all the plug-in units (4) to be positioned on the same horizontal plane after the plug-in unit (4) is connected with the precast pile cap body (1);

2) A clamping piece is placed in a connecting hole (5) at the top of the precast pile (A);

3) Leveling the precast pile cap body (1), and slowly moving to the position above the precast pile (A) to be connected, so that the position of the plug-in unit (4) is aligned with the position of the connecting hole (5) at the top of the precast pile (A);

4) Slowly and vertically putting down the prefabricated pile cap body (1), enabling the plug-in components (4) to enter the connecting holes (5), and enabling the clamping pieces to clamp the concave parts of the plug-in components (4) or the transition sections of the concave parts and the convex parts to finish connection.

9. The connection method for the quick connection precast pile caps for the composite foundation according to claim 8, wherein after the clamping piece is placed in the connection hole (5) at the top of the precast pile, the epoxy resin is poured into the connection hole (5) and the top surface of the precast pile (A).