CN215857655U

CN215857655U - Concrete precast pile

Info

Publication number: CN215857655U
Application number: CN202120985940.6U
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2022-02-18
Anticipated expiration: 2030-07-02
Also published as: CN213732360U

Abstract

The utility model discloses a concrete precast pile which comprises a pile body (3) and a pile tip (4), wherein the pile body (3) and the pile tip (4) are integrally cast, a plurality of nuts (17) are embedded at the end part of the pile body (3) around the pile tip (4), and the nuts (17) are sealed and antisepticized by sealing parts or sealing materials. The precast concrete pile omits the step of splicing the pile tip with the pile body after the pile tip is separately processed and molded, simultaneously avoids the gap existing when the pile tip is butted with the pile body, and is beneficial to improving the corrosion resistance of the precast concrete pile, thereby enhancing the connection strength and the integral strength of the pile body and the pile tip; in addition, during the manufacturing of the concrete precast pile, the nut is sealed and antisepticized by adopting epoxy resin and/or a sealing plug and/or concrete, so that the risk of corroding a stress bar is avoided or reduced, and the anticorrosion performance of the concrete precast pile is favorably improved, thereby prolonging the service life of the concrete precast pile.

Description

Concrete precast pile

Technical Field

The utility model relates to the technical field of concrete precast piles, in particular to a concrete precast pile with a pile tip.

Background

Currently, precast piles used in the field of building construction mainly include two types of precast piles, namely concrete precast piles and steel piles, wherein the concrete precast piles are prestressed concrete piles which are precast in factories and have a framework inside.

The precast concrete pile features that it can bear great load, firm and durable, and has fast construction speed, and its construction process includes prefabrication, transportation, piling and pile sinking, and the pile sinking method includes mainly hammering method, static pile pressing method, vibrating method, etc. during pile sinking, pile sinking equipment is used to drive pile into soil, and the hammering method is to use pile hammer to hammer the end of precast pile to overcome the resistance of soil to pile and to sink the pile to preset bearing layer.

In order to facilitate pile sinking, the lower end of the precast concrete pile may be generally designed to have a pointed shape, such as a truncated pyramid shape or a frustum of cone shape. Therefore, the lower end of the concrete precast pile can smoothly break the soil body, and the resistance encountered during pile sinking is reduced, so that the purposes of reducing the power and the hammering times of used pile sinking equipment and the like are achieved, and the damage to the pile body caused by pile sinking operation is avoided.

The pile tip of the concrete precast pile is generally formed in the following two ways:

one is that the pile toe pours and moulds integrally with the pile body of the precast concrete pile, such as a mould used for pouring and moulding the solid square pile toe that CN209615863U discloses, its bottom of mould is a cube, a square terrace of arris is connected to the square top, there is a terrace in the junction of square terrace and the square, the cube and the inside of the square terrace are hollow, when using, pour the concrete into the mould inside; simultaneously evenly seted up a plurality of round through-holes on the platform for insert and establish the reinforcing bar, the interval is equal between two adjacent round through-holes, can make the reinforcing bar distribute at the inside of product uniformly. The mould needs to cut off the reinforcing steel bars after forming, thereby causing resource waste and being complex to operate.

The other type is that the pile tip is separately processed and formed and then is installed at one end of the concrete precast pile through a connecting piece. Although the forming mode does not need to cut off the stress bar, connecting pieces are additionally arranged at the pile tip and one end of the precast pile, on one hand, the part cost and the assembling process are increased, on the other hand, a joint exists at the joint of the pile tip and the pile body, and even if materials such as epoxy resin are adopted for sealing, the risk that the internal connecting pieces and the stress bar are corroded from the joint still exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a concrete precast pile. The pile toe and the pile body of the precast pile are integrally poured and formed, the step of splicing the pile toe with the pile body after being independently processed and formed is omitted, meanwhile, a gap existing when the pile toe is butted with the pile body is avoided, the improvement of the corrosion resistance of the concrete precast pile is facilitated, and therefore the connection strength and the overall strength of the pile body and the pile toe are enhanced.

In order to achieve the purpose, the utility model provides a concrete precast pile which comprises a pile body and a pile tip, wherein the pile body and the pile tip are integrally cast, a plurality of nuts surround the pile tip and are embedded at the end part of the pile body, and the nuts are sealed and antisepticized by sealing parts or sealing materials.

Preferably a plurality of said nuts are arranged around the pile tip axis.

Preferably, the pile tip is formed with a counter bore corresponding to a nut, and the nut is located in the counter bore.

Preferably, the sealing member is a sealing plug.

Preferably, the sealing material is epoxy resin and/or concrete.

Preferably, the pile body is a variable cross-section solid square pile, an equal cross-section hollow square pile, an equal cross-section round pile or a variable cross-section round pile.

The concrete precast pile provided by the utility model has the advantages of easy tensioning, material saving and the like, and the pile body and the pile tip are integrally cast and formed, so that the step of splicing the pile tip with the pile body after being separately processed and formed is omitted, and meanwhile, a gap existing when the pile tip is butted with the pile body is avoided, so that the corrosion resistance of the concrete precast pile is favorably improved, and the connection strength and the integral strength of the pile body and the pile tip are enhanced; in addition, during the manufacturing of the concrete precast pile, the nut is sealed and antisepticized by adopting epoxy resin and/or a sealing plug and/or concrete, so that the risk of corroding a stress bar is avoided or reduced, and the anticorrosion performance of the concrete precast pile is favorably improved, thereby prolonging the service life of the concrete precast pile.

Drawings

Fig. 1 is a schematic structural diagram of a pile tip mold disclosed in an embodiment of the present invention;

FIG. 2 is a left side view of the pile tip mold of FIG. 1;

FIG. 3 is an isometric view of the toe mold of FIG. 1;

FIG. 4 is a cross-sectional rotated view A-A of the pile tip mold shown in FIG. 2;

FIG. 5 is a cross-sectional rotated view B-B of the pile tip mold shown in FIG. 2;

FIG. 6 is a partial enlarged view of portion I of FIG. 4;

FIG. 7 is a schematic view of a partial structure of a concrete precast pile with a pile tip and a pile body integrally formed;

FIG. 8 is a partial enlarged view of portion II of FIG. 7;

fig. 9 is a schematic structural view of another pile tip mold disclosed in the embodiment of the present invention;

fig. 10 is a top view of a precast concrete pile mold according to an embodiment of the present invention; fig. 11 is a partial view of the concrete precast pile mold shown in fig. 10;

fig. 12 is a schematic drawing of the tension connection of the pile tip mould and the tension equipment.

In the figure:

1. pile tip mould 11, pile tip forming body 12, tensioning connecting piece 13, tensioning connecting rod 14, tensioning part 15, tensioning through hole 15a, positioning through hole 16, tensioning bolt 17, nut 18, mounting hole 19, core rod 20, positioning sleeve 21, counter bore 22, transition forming part 221, end plane 222, inclined plane 223, first arc surface 224, second arc surface 23 and tensioning connecting box

2. Mould body 2a, concrete distribution area 3, pile body 4, pile tip 5, tensioning equipment

Detailed Description

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

In this specification, terms such as "upper, lower, inner, and outer" are established based on positional relationships shown in the drawings, and the corresponding positional relationships may vary depending on the drawings, and therefore, the terms are not to be construed as absolutely limiting the scope of protection; defining a concrete distribution area close to the mould body as an inner area, and otherwise, defining a concrete distribution area close to the mould body as an outer area;

moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic structural diagram of a pile tip mold according to an embodiment of the present invention; FIG. 2 is a left side view of the pile tip mold of FIG. 1; fig. 3 is an isometric view of the stake point die of fig. 1.

As shown in the drawings, in one embodiment, the main body of the pile tip mold 1 provided by the utility model is a pile tip forming body 11, and the pile tip forming body 11 is in a quadrangular frustum pyramid shape and is suitable for forming a pile tip at the end of a pile body of a concrete prefabricated square pile with a square cross section. For the concrete precast tubular pile with a circular cross section, the pile tip forming body 11 is in a frustum shape.

The toe forming body 11 is by four template that are triangle-shaped on an ordinary basis, from four directions of upper and lower, left and right splice welding connection, forms four inclined plane positions of toe forming body 11, and the radial dimension of the toe forming cavity that forms diminishes from one end to the other end gradually, with the appearance with unanimous ground, toe forming cavity also is four prismatic table shapes, and the both ends of toe forming cavity form major diameter end and path end respectively, the major diameter end of toe forming body 11 is the opening end, and the concrete cloth district 2a of major diameter end towards mould body 2, when pouring, concrete material can flow to toe forming cavity from the concrete cloth district 2a of mould body 2 to fill up whole toe forming cavity, realize the integrated into one piece of toe and pile body.

In order to stretch the framework inside the pile body, the small-diameter end of the pile tip forming body 11 is provided with a stretching connecting piece 12, the stretching connecting piece 12 shown in the figure is a connecting block, the middle part of the connecting block is provided with a threaded hole, the small-diameter end of the pile tip forming body 11 is provided with an external thread, the connecting block is connected with the small-diameter end of the pile tip forming body 11 through the thread, and the pile tip forming body 11 can be connected with a stretching connecting rod 13 through the connecting block, so that the stretching equipment 5 can realize the axial prestress stretching of the stress bar after being connected with the stretching connecting rod 13.

The pile tip forming body 11 is provided with a tensioning part 14 at the periphery of a pile tip forming cavity, the tensioning part 14 has certain thickness so as to have enough tensile strength to bear and transmit tensile force, the tensioning part 14 is provided with tensioning through holes 15 corresponding to at least parts of nuts 17 at the end part of a pile body one by one, and when the pile tip forming body is used, each tensioning bolt 16 of the tensioning part 14 penetrates through the tensioning through holes 15 from the outer side and then is in threaded connection with the nuts 17 at the end part of the pile body.

If the pile tip forming body is cast, the pile tip forming body 11 and the tension portion 14 can be integrally formed, and if the pile tip forming body 11 and the tension portion 14 are separately manufactured, the pile tip forming body 11 and the tension portion 14 can be connected and fixed by assembling.

An axially extending mounting hole 18 can be machined in the center of the small-diameter end of the pile tip forming cavity to mount a core rod 19 of the pile tip, one end of the core rod 19 can be inserted into the mounting hole 18 before formal casting, the other end of the core rod is exposed out of the mounting hole 18 to a sufficient distance in the direction of the pile body, after casting and demolding are completed, one end of the core rod 19 is firmly combined with a concrete material, and the other end of the core rod forms a steel tip with a smaller diameter at the tail end of the pile tip, so that the pile can be sunk by breaking rocks more easily. Of course, the end of the mandrel 19 may be formed with a relatively sharp shape to facilitate breaking through the earth.

Referring to fig. 4, fig. 5 and fig. 6, fig. 4 is a sectional view of a-a of the pile tip mold shown in fig. 2; FIG. 5 is a cross-sectional rotated view B-B of the pile tip mold shown in FIG. 2; fig. 6 is a partially enlarged view of the portion I in fig. 4. As shown in the figure, the tensioning portion 14 is disposed at the periphery of the large-diameter end of the pile toe forming body 11, a positioning sleeve 20 may be disposed in the tensioning through hole 15, the positioning sleeve 20 is disposed at an inner port of the tensioning through hole 15, a part of the positioning sleeve 20 is located inside the tensioning through hole 15, and another small part of the positioning sleeve exceeds the inner port of the tensioning through hole 15 by a certain distance, after the tensioning bolt 16 and the nut 17 are connected in place, the exposed end portion of the positioning sleeve 20 can be abutted against the nut 17 at the end portion of the pile body, so that on one hand, concrete materials can be prevented from entering the nut 17, on the other hand, after casting, a counter bore 21 (see fig. 7) corresponding to the nut 17 can be formed on the pile toe, and the nut 17 is prevented from being damaged due to being exposed on the surface of the pile toe in the pile sinking process.

By arranging a sealing component (not shown) such as a plastic cover in the counter bore 21 or filling the counter bore 21 with a sealing material such as epoxy resin, the nut 17 and the internal stress bar can be further protected from being corroded by substances such as chloride in soil after pile sinking.

Referring to fig. 7 and 8, fig. 7 is a partial structural schematic view of a concrete precast pile with a pile tip and a pile body integrally formed; fig. 8 is a partially enlarged view of a portion II in fig. 7.

As shown in the figure, the periphery of the inner surface of the tensioning part 14 is provided with a transition forming part 22, and the transition forming part 22 is higher than the inner surface of the tensioning part 14, so that a smooth transition part is formed at the corner of the pile body 3 and the pile toe 4, and the corner is prevented from being damaged when the pile is sunk.

Specifically, the transition forming portion 22 includes a circumferential end plane 221, a slope 222 is formed between the end plane 221 and the inner surface of the tensioning portion 14, the inner surface of the tensioning portion 14 and the slope 222 are smoothly transitioned through a first arc 223, and the slope 222 and the end plane 221 are smoothly transitioned through a second arc 224.

In addition, in order to improve the structural strength of the pile tip form 1, two parallel rib plates (not shown) may be provided on the outer surface of each form of the pile tip forming body 11, and the rib plates may be wing-shaped and welded to the tension part 14 or the form.

In other embodiments, the tension portion 14 may be provided with a plurality of loops of tension perforations 15. This is because the position of the nut 17 at the end of different pile bodies 3 may be different, for example, the nut 17 of the variable cross-section prefabricated square pile and the nut 17 of the common prefabricated square pile are arranged differently, if the cross-sectional views are overlapped, one circle of nut 17 of the variable cross-section prefabricated square pile will be located inside one circle of nut 17 of the common prefabricated square pile, that is, the circle formed by the nut 17 of the common prefabricated square pile is larger than the circle formed by the nut 17 of the variable cross-section prefabricated square pile, and by providing a plurality of circles of tensioning through holes 15 on the tensioning portion, the pile tip form 1 can be matched with different pile bodies 3 to manufacture corresponding pile tips 4. When the mould is used for producing the concrete precast pile, unused tensioning through holes 15 can be plugged so as to prevent slurry leakage during pouring.

The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of the above embodiments, various embodiments can be obtained by performing targeted adjustment according to actual needs. For example, the tension connection member may have various forms, the connection block of the small diameter end of the pile tip forming body 11 may be changed to a tension screw, the tension screw may be used as the tension connection member, and so on. This is not illustrated here, since many implementations are possible.

Referring to fig. 9, fig. 9 is a schematic structural diagram of another pile tip mold 1 according to an embodiment of the present invention.

As shown in the drawings, in addition to the pile tip mold 1, the present invention further provides another pile tip mold 1, wherein the tensioning portion 14 has a hollow interior and can be sleeved on the periphery of the pile tip forming cavity, the tensioning portion 14 is located between the large-diameter end and the small-diameter end, the tensioning portion 14 is provided with tensioning through holes 15 corresponding to at least parts of nuts 17 at the end of the pile body one by one, the extending sections of the tensioning through holes 15 penetrate through the inclined surface of the pile tip forming body 11 in the front-back direction to form positioning through holes 15a, and tensioning bolts 16 of the tensioning portion 14 are respectively used for penetrating through the tensioning through holes 15 from the outside and then are in threaded connection with the nuts 17 at the end of the pile body.

The positioning through hole 15a can be formed in at least two forms, one is to directly form a through hole in the template of the pile tip forming body 11 to form the positioning through hole 15a, and the other is to form a through hole in the template of the pile tip forming body 11, then to arrange the positioning sleeve 20 in the through hole, and to form the positioning through hole 15a by using the inner hole of the positioning sleeve 20.

The second form of positioning through hole 15a is shown in the figure, which not only facilitates the passing of the tension bolt 16 by the positioning sleeve 20 and guides the tension bolt 16 to connect with the nut 17 at the end of the framework, but also the positioning sleeve 20 has a certain length and a large contact area with the tension bolt 16, which can prevent the tension bolt 16 and the pile tip forming body 11 from being worn. If the positioning sleeve 20 is not arranged, local abrasion is easily caused in the long-term use process due to the fact that the contact area of the tensioning bolt 16 and the through hole is small, the butt joint precision and the connection reliability are further affected, and even slurry leakage is caused.

More specifically, the through hole on the pile tip forming body 11 is oval when viewed along the axial direction, that is, the axial projection of the through hole is oval, after the positioning sleeve 20 is inserted into the through hole, the gap between the outer peripheral wall of the positioning sleeve and the inner peripheral wall of the through hole is filled, connected and sealed by solder, and the oval through hole can enable the positioning sleeve 20 to have a certain adjustment margin when being installed, so that the positioning sleeve is ensured to be in an accurate position, and errors are reduced. In addition, the end part of the positioning sleeve 20, which is positioned at one end outside the pile tip forming cavity, is connected to the tensioning part 14, so that the installation and the positioning are convenient, and the overall strength of the pile tip mould 1 is improved.

The outer peripheral surface of the locating sleeve 20 located at one end of the pile tip forming cavity is conical, a demoulding angle is formed by the conical degree, the locating sleeve 20 can be smoothly separated from a concrete material when demoulding is carried out, the concrete material is prevented from being damaged, the integrity of a formed orifice is ensured, and the precast pile has higher forming quality.

Referring to fig. 10, fig. 11, and fig. 12, fig. 10 is a top view of a precast concrete pile mold according to an embodiment of the present invention; fig. 11 is a partial view of the concrete precast pile mold shown in fig. 10; fig. 12 is a schematic drawing of the tension connection of the pile tip mould and the tension equipment.

As shown in the figures, in addition to the pile tip mold, the present invention also provides a concrete precast pile mold, taking an open mold for producing a concrete precast square pile as an example, the mold body 2 is in a "U" shape with an upward opening in cross section, the pile tip mold 1 is disposed at one end of the inner cavity of the mold body 2, and the large diameter end of the pile tip mold 1 faces the concrete distributing area 2a of the mold body 2 and is used in cooperation with the mold body 2.

When in production, firstly, a framework with a pile end forming plate at one end is placed in an inner cavity of a mould body 2, a pile tip mould 1 is positioned at the other end of the framework, then, tensioning bolts 16 of the pile tip mould 1 are butted with nuts 17 of the framework one by one, a tensioning connecting box 23 is adopted to connect a connecting block with a tensioning connecting rod 13, then, tensioning equipment 5 is adopted to tension the framework from one end, after tensioning and locking tensioning, concrete materials are injected into a concrete distributing area 2a of the mould body 2 to integrally cast and form a pile tip 4 and a pile body 3, after the concrete materials are kept still and steamed and completely solidified, tensioning and locking are released, the pile tip mould 1 is moved along the axial direction to be separated from the pile tip 4, then, the formed precast concrete pile is lifted from the mould body 2 to be demoulded, and finally, the precast concrete pile is transferred to a storage yard to be stored.

Regarding the rest of the structure of the precast concrete pile mold, please refer to the prior art, and the description is omitted herein.

It can be seen that pile body 3 and pile tip 4 can be formed together by using pile tip mold 1 and mold body 2 together, so as to obtain a concrete precast pile (with a core rod) as shown in fig. 7. Meanwhile, tensioning can be realized without reserving a longer stress rib to be anchored on the tensioning plate, demoulding can be realized only by disassembling the bolt at the later stage, the stress rib does not need to be cut off, and the tensioning device has the advantages of material saving, simplicity and convenience in operation, easiness in demoulding and the like.

The above description mainly takes a square precast pile as an example, and it can be understood that the pile tip mould provided by the utility model can also be used for a round precast pile or other polygonal precast piles, such as a triangular pile, an octagonal pile and the like, and a variable cross-section precast pile comprising a large cross-section and a small cross-section along the length direction.

Taking a round precast pile as an example, since the pile tip is usually frustum-shaped, correspondingly, the pile tip forming body 11 of the pile tip mold 1 is also frustum-shaped and has a frustum-shaped pile tip forming cavity, the outer contour of the tension part 14 is round, and the rest of the structure is basically the same as that of the above embodiment, and it is not repeated here, please refer to the above.

As shown in fig. 7, fig. 7 is a partial structural schematic view of a concrete precast pile with a pile tip 4 and a pile body 3 integrally formed.

The utility model also provides a concrete precast pile, which comprises a pile body 3 and a pile tip 4, wherein the pile body 3 can be a variable cross-section solid square pile, a constant cross-section hollow square pile, a constant cross-section round pile, a variable cross-section round pile and the like, the matching of the structural shapes of the pile body 3 and the pile tip 4 is met according to the shape specification requirements of the concrete precast pile, and different concrete precast pile molds can be adopted for preparation. The end part of the pile body 3 is embedded with a plurality of nuts 17, the plurality of nuts 17 are arranged around the periphery of the pile tip 4, a counter bore 21 (see fig. 7) corresponding to the nut 17 is formed on the pile tip 4 of the concrete precast pile prepared by the concrete precast pile mould, a sealing component (not shown in the figure) such as a plastic cover is arranged in the counter bore 21, or the counter bore 21 is filled with epoxy resin and/or a sealing plug and/or a sealing material such as concrete sealing corrosion prevention, and the nut 17 and the internal stress bar can be further protected from being corroded by substances such as chloride in soil mass after pile sinking. According to the concrete precast pile provided by the utility model, the pile body 3 and the pile tip 4 are integrally cast and formed, so that the step of splicing the pile tip 4 with the pile body 3 after being separately processed and formed is omitted, and meanwhile, a gap existing when the pile tip 4 is butted with the pile body 3 is avoided, so that the corrosion resistance of the concrete precast pile is favorably improved, and the connection strength and the integral strength of the pile body 3 and the pile tip 4 are enhanced; in addition, during the manufacturing of the concrete precast pile, the nut 17 is sealed and antisepticized by adopting epoxy resin and/or a sealing plug and/or concrete, so that the risk of corroding the stress bar is reduced, and the anticorrosion performance of the concrete precast pile is improved, thereby prolonging the service life of the concrete precast pile.

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

Claims

1. The utility model provides a concrete precast pile, includes pile body (3) and stake point (4), its characterized in that, pile body (3) and stake point (4) integrative casting shaping, a plurality of nuts (17) encircle stake point (4) inlay and adorn in the tip of pile body (3), nut (17) adopt seal part or sealing material to seal anticorrosive.

2. A precast concrete pile according to claim 1, characterized in that a plurality of said nuts (17) are arranged around the pile tip (4) axis.

3. Concrete precast pile according to claim 2, characterized in that the pile tip (4) is formed with a counter bore corresponding to a nut (17), the nut (17) being located in the counter bore.

4. A concrete precast pile according to claim 3, wherein the sealing member is a sealing plug.

5. The concrete precast pile according to claim 3, wherein the sealing material is epoxy resin and/or concrete.

6. The precast concrete pile according to claim 4 or 5, wherein the pile body (3) is a variable section solid square pile, a constant section hollow square pile, a constant section round pile or a variable section round pile.