CN212978698U

CN212978698U - Mould for manufacturing variable cross-section precast pile and mould set thereof

Info

Publication number: CN212978698U
Application number: CN202021830318.XU
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-04-16
Anticipated expiration: 2030-08-28

Abstract

The utility model provides a mould and mould group of preparation variable cross section precast pile. The mould of preparation variable cross section precast pile includes: a coarse mold cavity section capable of forming a large section of the precast pile, a fine mold cavity section capable of forming a small section of the precast pile and a transition mold section for connecting the fine mold cavity section and the coarse mold cavity section; at least part of the transition mold section is detachably connected with the adjacent coarse mold cavity section and/or fine mold cavity section, so that the inner wall of the coarse mold cavity section and the inner wall of the fine mold cavity section are smoothly transited. The utility model discloses a can dismantle the connection with the thick die cavity section and/or the thin die cavity section of part transitional mould section and adjacent neighbour, can increase or dismantle transitional mould section and adjacent thick die cavity section and/or thin die cavity section according to the stake length of the required variable cross section precast pile of actual production to the whole length of adjustment mould improves the commonality of mould.

Description

Mould for manufacturing variable cross-section precast pile and mould set thereof

Technical Field

The utility model relates to a prefabricated component field especially relates to a mould of preparation variable cross section precast pile and mould group thereof.

Background

With the development of technology, more and more building components are prefabricated, but for the prefabricated production of the special-shaped concrete components, the process is complex and the difficulty is high. The prestressed concrete special-shaped solid square pile is used as one of special-shaped concrete members, has higher vertical compression bearing capacity and better anti-pulling effect compared with a prestressed concrete solid square pile with a uniform section, and has a wider application range. Although the production process of the existing prestressed concrete pipe pile is mature, the production efficiency of the prestressed concrete special-shaped solid square pile is low, and the product quality is not easy to control.

At present, the precast pile mould is generally formed by welding, and the length of the precast pile mould can not be adjusted in the actual use process due to welding, so that the precast pile mould can only produce precast pile moulds with one length specification, however, the length of the precast pile is usually from 6 meters to 15 meters, and in order to produce precast piles with various lengths, a batch of precast pile moulds with various lengths are required to be manufactured, in the field of precast piles, the specifications of the produced precast piles need to be changed at any time according to geological conditions and actual market demands, so that a batch of precast pile moulds with non-adaptive length are in an idle state, and the precast pile moulds with adaptive specifications are in a shortage state, so that the production efficiency of the precast pile cannot be rapidly and effectively improved, and the mold cost is high, and the cost is increased again because a batch of precast pile molds are manufactured again.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a preparation variable cross section precast pile's that can adjust self die cavity length mould.

For solving the technical problem, the utility model discloses a following technical scheme:

a mold for manufacturing a precast pile with a variable cross section, comprising: a coarse mold cavity section capable of forming a large section of the precast pile, a fine mold cavity section capable of forming a small section of the precast pile and a transition mold section for connecting the fine mold cavity section and the coarse mold cavity section; wherein at least part of the transition mold section is detachably connected with the adjacent coarse mold cavity section and/or fine mold cavity section so as to enable the inner wall of the coarse mold cavity section and the inner wall of the fine mold cavity section to smoothly transition.

The utility model provides an in the mould, transition mould section inner wall is formed with the transition and makes the profile, and the profile is makeed in the transition and inclines to the inner wall of mould axis and the smooth inner wall that links up thin mould chamber section and thick mould chamber section.

The maximum wall thickness value of the transition die section in the die provided by the utility model is larger than the wall thickness value of the thin die cavity section and/or the wall thickness value of the thick die cavity section;

in the die provided by the utility model, the transition die section is provided with a wall thickness abrupt change section along the longitudinal direction;

in the mould provided by the utility model, at least part of transition mould sections are integrally formed with the adjacent coarse mould cavity section or fine mould cavity section;

in the mould provided by the utility model, the local size parameter of the inner wall of the mould is determined according to the formula Y which is more than or equal to 0.5465X +54.383mm, wherein Y is the lower limit value of the transverse width of the bottom surface of the inner wall of the thin mould cavity section close to the transition mould section, and X is the lower limit value of the transverse width of the bottom surface of the inner wall of the thick mould cavity section close to the transition mould section;

in the mould provided by the utility model, if the concrete strength grade of the formed variable cross section precast pile is higher than or equal to C60, the inner wall local dimension parameter of the mould is determined according to the formula Y being more than or equal to 0.5864X +58.352, wherein Y is the transverse width lower limit value of the inner wall bottom surface of the thin mould cavity section close to the transition mould section, and X is the transverse width lower limit value of the inner wall bottom surface of the thick mould cavity section close to the transition mould section;

if the concrete strength grade of the formed variable-section precast pile is higher than or equal to C40, determining the local size parameter of the inner wall of the mold according to a formula Y of more than or equal to 0.6796X +67.635, wherein Y is the lower limit value of the transverse width of the bottom surface of the inner wall of the thin mold cavity section close to the transition mold section, and X is the lower limit value of the transverse width of the bottom surface of the inner wall of the thick mold cavity section close to the transition mold section;

the utility model provides an in the mould, the inner wall local dimension parameter of mould is less than or equal to 0.988X-13.589 according to formula Z and confirms, wherein, Z is the transverse width upper limit value that thin die cavity section inner wall top surface is close to transition die section department, and X is the transverse width lower limit value that thick die cavity section inner wall bottom surface is close to transition die section department, and X is greater than or equal to 250 mm.

In the die provided by the utility model, one end of the transition die section is provided with a first positioning surface for positioning the longitudinal end part of the thin die cavity section and a first connecting surface for connecting and fixing the longitudinal end part of the thin die cavity section, preferably, the first positioning surface is adjacent to the first connecting surface;

and/or the other end of the transition mould section is provided with a second positioning surface for positioning the longitudinal end of the coarse mould cavity section and a second connecting surface for connecting and fixing the longitudinal end of the coarse mould cavity section, and the second positioning surface is preferably adjacent to the second connecting surface.

In the die provided by the utility model, the first connecting surface of the transition die section is provided with a connecting hole for connecting with the thin die cavity section, preferably, the first positioning surface and the first connecting surface are coplanar or form a preset included angle;

and/or a connecting hole for connecting with the rough die cavity is formed in the second connecting surface of the transition die section, and preferably, the second positioning surface and the second connecting surface are coplanar or form a preset included angle;

the first connecting surface and the fine die cavity section, and the second connecting surface and the coarse die cavity section are fixedly connected by fasteners.

In the mould provided by the utility model, one end of the transition mould section is provided with a first mounting groove for the insertion of the end part of the thin mould cavity section, preferably, the end part of the thin mould cavity section and the first mounting groove are fixedly mounted by a fastener;

and/or a second mounting groove for inserting the end part of the coarse die cavity section is formed at the other end of the transition die section, and preferably, the end part of the coarse die cavity section and the second mounting groove are fixedly mounted by a fastener.

In the mould provided by the utility model, the end part of the thin mould cavity section is inserted into the first mounting groove and is fixedly connected with the transition mould section;

and/or the end part of the coarse die cavity section is inserted into the second mounting groove and is fixedly connected with the transition die section.

The utility model provides an in the mould, thick mould chamber section and thin mould chamber section are the open U type mould section in top, and the vertical axis collineation of the vertical axis of thin mould chamber section and thick mould chamber section.

The beneficial effects of the utility model reside in that: (1) the thin die cavity section and the thick die cavity section are connected through the transition die section, so that the inner wall of the thick die cavity section and the inner wall of the thin die cavity section are in smooth transition, the demolding resistance between the molded variable-section precast pile and the die is reduced, and demolding is facilitated.

(2) Can dismantle the connection with the adjacent thick die cavity section and/or the thin die cavity section of part transitional mould section, can be according to the stake length of the required variable cross section precast pile of actual production, increase or dismantle transitional mould section and adjacent thick die cavity section and/or thin die cavity section, thereby the whole length of adjustment mould, improve the commonality of mould, and need not to make the mould again, practice thrift the mould cost, in addition also can utilize idle mould, carry out simple concatenation can, improve the production utilization ratio of mould.

Another object of the utility model is to provide a mould group of preparation variable cross section precast pile, including the foretell mould of preparation variable cross section precast pile of a plurality of, the mould of preparation variable cross section precast pile transversely arranges in proper order, and two adjacent precast pile moulds form the clearance at the thin die cavity section at least.

The utility model provides a preparation variable cross section precast pile's mould group still has the advantage of making things convenient for a plurality of moulds cloth simultaneously except having the same technological effect with aforementioned mould of preparation variable cross section precast pile, therefore has the effect that production efficiency is high.

Drawings

Fig. 1 is a schematic structural view of a mold for manufacturing a precast pile with a variable cross section in embodiment 1 of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at the letter A;

fig. 3 is a schematic structural diagram of a transition mold section in embodiment 1 of the present invention;

fig. 4 is a schematic structural view of a mold for manufacturing a precast pile with a variable cross section according to embodiment 2 of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 taken at the letter B;

fig. 6 is a schematic structural view of a transition mold section in embodiment 2 of the present invention;

fig. 7 is a schematic structural view of a mold for manufacturing a precast pile with a variable cross section according to embodiment 3 of the present invention;

FIG. 8 is an enlarged view of a portion of FIG. 7 taken at the letter C;

fig. 9 is a schematic structural view of a transition mold section in embodiment 3 of the present invention;

fig. 10 is a schematic structural view of a mold for manufacturing a precast pile with a variable cross section according to embodiment 4 of the present invention;

FIG. 11 is an enlarged view of a portion of FIG. 10 taken at the letter D;

fig. 12 is a schematic structural view of a transition mold section in embodiment 4 of the present invention;

fig. 13 is a schematic structural view of a mold for manufacturing a precast pile with a variable cross section according to embodiment 5 of the present invention;

FIG. 14 is an enlarged view of a portion of FIG. 13 at letter E;

fig. 15 is a schematic structural view of a transition mold section in embodiment 5 of the present invention;

fig. 16 is a schematic structural view of a mold for manufacturing a precast pile with a variable cross section according to embodiment 6 of the present invention;

FIG. 17 is an enlarged view of a portion of FIG. 16 taken at the letter F;

fig. 18 is a schematic structural view of a transition mold section in embodiment 6 of the present invention;

fig. 19 is a schematic structural view of a die set for manufacturing a precast pile with a variable cross section in embodiment 7 of the present invention.

Fig. 20 is a step diagram of a method for manufacturing a variable cross-section precast pile mold according to embodiment 8 of the present invention.

Detailed Description

In order to facilitate understanding of the technical solutions of the present invention, the following detailed description is made with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in fig. 1, the present embodiment provides a mold for manufacturing a precast pile with a variable cross-section, including: a coarse mold cavity section 1 capable of forming a large section of the precast pile, a fine mold cavity section 2 capable of forming a small section of the precast pile and a transition mold section 3 for connecting the fine mold cavity section 2 and the coarse mold cavity section 1; wherein at least part of the transition mold section 3 is detachably connected with the adjacent coarse mold cavity section 1 and/or fine mold cavity section 2 in the longitudinal direction (i.e. the length direction of the precast pile with variable cross section) so as to enable the smooth transition between the inner wall of the coarse mold cavity section 1 and the inner wall of the fine mold cavity section 2.

In the structure, the thin die cavity section 2 and the thick die cavity section 1 are connected through the transition die section 3, so that the inner wall of the thick die cavity section 1 and the inner wall of the thin die cavity section 2 are in smooth transition, the demolding resistance between the molded variable-section precast pile and the die is reduced, and demolding is facilitated. The transition mould section 3 is detachably connected with the adjacent coarse mould cavity section 1 and/or the adjacent fine mould cavity section 2, the transition mould section 3 and the adjacent coarse mould cavity section 1 and/or the adjacent fine mould cavity section 2 can be increased or detached according to the pile length of the variable cross section precast pile required by actual production, so that the overall length of the mould is adjusted, the universality of the mould is improved, the mould does not need to be opened again, the cost is saved, in addition, the idle mould can be utilized, the simple splicing can be carried out, and the production utilization degree of the mould is improved.

In addition, since the precast pile with the variable cross section has the shortest length standard, for example, the shortest length of the precast pile is 6 meters, a part of the transition mold section 3 and the adjacent fine mold cavity section 2 and the adjacent coarse mold cavity section 1 can be connected into a standard mold section in advance, that is, the part of the transition mold section 3 and the adjacent fine mold cavity section 2 and the adjacent coarse mold cavity section 1 are connected into a mold with the length of 6 meters in advance, and the connection manner between a part of the transition mold sections 3 in the standard mold section and the adjacent fine mold cavity section 2 and the adjacent coarse mold cavity section 1 can be welding or bonding or integral molding. And if the pile length of the precast pile to be produced is lengthened, additionally connecting a transition mould section 3, a fine mould cavity section 2 and a coarse mould cavity section 1 on the basis of the standard mould section.

Of course, the mode that the transition die section 3, the fine die cavity section 2 and the coarse die cavity section 1 are directly detachably spliced into the die is not excluded.

The mould of variable cross section precast pile that this embodiment provided is used for the solid square pile of shaping variable cross section, therefore thick die cavity section 1 and thin die cavity section 2 are the open U type mould section in top, and the vertical axis of thin die cavity section 2 and the vertical axis collineation of thick die cavity section 1.

In the structure, in order to enhance the end bearing strength of the precast pile, the two ends of the mould are the thick mould cavity sections 1 with the lengthened length, so that the phenomenon that the concrete at the end part is damaged or even exploded in the pile sinking process of the precast pile can be avoided. And in this embodiment the length of the fine cavity section 2 is greater than the length of the coarse cavity section 1. Of course, in the utility model provides an in the mould, thick die cavity section 1 and thin die cavity section 2 can also combine the inner mold core with the hollow square pile of shaping variable cross section. In addition, because the longitudinal central axes of the coarse cavity section 1 and the fine cavity section 2 are collinear, a distance difference exists between the end part of the coarse cavity section 1 and the end part of the fine cavity section 2, and the coarse cavity section 1 and the fine cavity section 2 are connected by the transition mold section 3 to eliminate the distance difference at the position, so that a longitudinally continuous U-shaped long cavity is formed.

Further, in order to reduce the drawing of patterns resistance between variable cross section precast pile and the mould, the 3 inner walls of transition mould section are formed with the transition and make profile 31, the profile 31 is made in the transition and is inclined to mould axis and the smooth inner wall that links up thin die cavity section 2 and thick die cavity section 1, so that the profile 31 is made in the transition and is the slope form setting, drawing of patterns after the variable cross section precast pile shaping of being convenient for, get rid of stress after avoiding concrete material cooling solidification and lead to the mould to resume deformation and receive the effect of resilience effect to be carried and lead to the problem of difficult drawing of patterns at transition mould section 3 department concrete. Because the rigid framework of precast pile need stretch-draw, the variable cross section precast pile who forms after concrete material cooling solidification can form great tensile stress with between the transition mould section 3, consequently can form stress concentration district in transition mould section 3 department, avoid the deformation of transition mould section 3 too big, preferably, the biggest wall thickness value of transition mould section 3 is greater than the wall thickness value of thin mould chamber section 2 and the wall thickness value of thick mould chamber section 1 to strengthen the structural strength of transition mould section 3. In addition, due to the distance difference between the fine die cavity section 2 and the coarse die cavity section 1, the tensile stress between the transition die section 3 and the precast pile with the variable cross section is more concentrated near the fine die cavity section 2, and the tensile stress is smaller near the coarse die cavity section 3, so that in order to save certain cost, the transition die section 3 is provided with a wall thickness abrupt change section along the longitudinal direction, the wall thickness near the fine die cavity section 2 is greater than that near the coarse die cavity section, and preferably, the wall thickness of the transition die section 3 is gradually reduced in the direction from the fine die cavity section 2 to the coarse die cavity section 2.

Further, as shown in fig. 2 and 3, the transition mold section 3 has a first positioning surface 32 at one end for positioning the longitudinal end of the fine mold cavity section 2 and a first connecting surface 33 for connecting and fixing the longitudinal end of the fine mold cavity section 2, preferably, the first positioning surface 32 is adjacent to the first connecting surface 33; the other end of the transition mold section 3 has a second positioning surface 34 for positioning the longitudinal end of the coarse mold cavity section 1 and a second connecting surface 35 for connecting and fixing the longitudinal end of the coarse mold cavity section 1, wherein the second positioning surface 34 is preferably adjacent to the second connecting surface 35.

Specifically, the first connecting surface 33 of the transition mold section 3 is provided with a connecting hole 331 for connecting with the thin mold cavity section 2, and the first positioning surface 32 and the first connecting surface 33 form a predetermined included angle; a connecting hole 331 for connecting with the coarse mold cavity section 1 is formed in the second connecting surface 35 of the transition mold section 3, and preferably, a predetermined included angle is formed between the second positioning surface 34 and the second connecting surface 35; the first connecting surface 33 and the thin die cavity section 2, and the second connecting surface 35 and the thick die cavity section 1 are connected and fixed by fasteners.

In the above structure, the end surface of the thin cavity segment 2 abuts against the first positioning surface 32, and the fastening member passes through the connecting hole 331 on the first connecting surface 33 to be connected and fixed with the thin cavity segment 2. In the present embodiment, the first positioning surface 32 and the first connecting surface 33 are formed on the inner wall of the transition mold section 3 (i.e. a step is milled on the inner wall of one end of the transition mold section 3 along the circumferential contour line of the inner wall), the plane of the first positioning surface 32 is parallel to the longitudinal central axis of the fine mold cavity section 2, the plane of the first connecting surface 33 is perpendicular to the longitudinal central axis of the fine mold cavity section 2, the first positioning surface 32 is perpendicular to the first connecting surface 33, and the axis of the connecting hole 331 is perpendicular to the longitudinal central axis of the fine mold cavity section 2.

Similarly, the end surface of the end of the coarse mold cavity section 1 abuts against the second positioning surface 34, and the fastener passes through the connecting hole 331 on the second connecting surface 35 to be connected and fixed with the coarse mold cavity section 1. In this embodiment, the second positioning surface 34 and the second connecting surface 35 are both formed on the inner wall of the transition mold section 3 (i.e., a step is milled or cut on the inner wall of the other end of the transition mold section 3 along the circumferential contour line of the inner wall), the plane of the second positioning surface 34 is parallel to the longitudinal central axis of the coarse mold cavity section 1, the plane of the second connecting surface 35 is perpendicular to the longitudinal central axis of the coarse mold cavity section 1, and the second positioning surface 34 is perpendicular to the second connecting surface 35. And after the coarse cavity section 1, the fine cavity section 2 and the transition cavity section 3 are connected, the transition molding surface 31 of the transition cavity section 3 is adjacent to the inner wall of the coarse cavity section 1 and the inner wall of the fine cavity section 2.

Example 2

In the present embodiment, the same portions as those in embodiment 1 are given the same reference numerals, and the same description is omitted.

As shown in fig. 4, 5 and 6, the difference between the mold for manufacturing the precast pile with the variable cross section provided in this embodiment and embodiment 1 is that: the connection structure between the fine die cavity section 2 and the transition die section 3 is different.

Specifically, in the present embodiment, the first positioning surface 32 is coplanar with the first connection surface 33, and both the first positioning surface 32 and the first connection surface 33 are perpendicular to the longitudinal central axis of the fine cavity segment 2. And because the first positioning surface 32 and the first connecting surface 33 are coplanar, the wall thickness of the fine die cavity section 2 is thin, and the connection with the transition die section 3 at the end surface is easy to cause unstable connection, at this time, in order to ensure that the fine die cavity section 2 can be connected and fixed with the transition die section 3, an apron plate 38 is arranged on the outer side surface of the end part of the fine die cavity section 2, and is connected and fixed with the first connecting surface 33 of the transition die section 3 through the apron plate 38, and the end surface of the apron plate 38 is abutted against the first connecting surface 33. The skirt 38 may be shaped to fit the end of the cavity section 2 and the skirt 38 may be integrally formed with the cavity section 2 or may be formed separately and welded or bonded to the cavity section 2. In this embodiment, the axis of the connecting hole 331 of the first connecting surface 33 is parallel to the longitudinal central axis of the thin cavity segment 2, and the fastening member is fixed to the connecting hole 331 of the first connecting surface 33 after passing through the skirt panel 38. After the coarse mold cavity section 1, the fine mold cavity section 2 and the transition mold section 3 are connected, the transition molding surface 31 of the transition mold section 3 is adjacent to the inner wall of the coarse mold cavity section 1 and the inner wall of the fine mold cavity section 2.

Example 3

As shown in fig. 7, 8 and 9, the difference between the mold for manufacturing the precast pile with the variable cross section provided by this embodiment and embodiment 1 is that: the connection structure between the coarse mold cavity section 1 and the transition mold section 3 is different.

Specifically, in this embodiment, a second mounting groove 37 for the end of the coarse mold cavity section 1 to be inserted is formed at one end of the transition mold section 3, and after the end of the coarse mold cavity section 1 is inserted into the second mounting groove 37, a fastener penetrates through the transition mold cavity section 3 and the coarse mold cavity section 1 to be connected and fixed. Of course, the end of the coarse mold cavity section 1 may be directly locked and fixed after being inserted into the second mounting groove 37. After the coarse mold cavity section 1, the fine mold cavity section 2 and the transition mold section 3 are connected, the transition molding surface 31 of the transition mold section 3 is adjacent to the inner wall of the coarse mold cavity section 1 and the inner wall of the fine mold cavity section 2.

Example 4

In this embodiment, the same portions as those in embodiment 3 are given the same reference numerals, and the same description is omitted.

As shown in fig. 10, 11 and 12, the difference between the mold for manufacturing the precast pile with variable cross section provided in this embodiment and embodiment 3 is that: in this embodiment, the connection structure between the fine cavity segment 2 and the transition mold segment 3 is changed on the basis of embodiment 3.

Specifically, a first mounting groove 36 for the end of the fine cavity section 2 to be inserted is formed at the other end of the transition mold section 3. Because the transition molding surface 31 of the transition mold section 3 is arranged obliquely, and the wall thickness of the transition mold section 3 is gradually reduced from the thin mold cavity section 2 to the thick mold cavity section 1, if the first installation groove 36 is formed at the edge of the inner wall at the end part of the transition mold section 3, the groove depth of the first installation groove 36 is very shallow, the connection between the thin mold cavity section 2 and the transition mold section 3 is unstable, and therefore the first installation groove 36 is close to the outer wall surface of the transition mold section 3. At this time, if the end of the fine cavity segment 2 is directly inserted into the first installation groove 36, the inner wall of the fine cavity segment 2 cannot abut against the transition molding surface 31 of the transition mold segment 3, which may cause a distance between the inner wall of the fine cavity segment 2 and the transition molding surface 31 of the transition mold segment 3 in the transverse direction, resulting in deformation of the pile body of the precast pile with variable cross section. An apron 38 is provided on the outer side of the end of the cavity segment 2, a flange extending in the longitudinal direction of the apron 38 being inserted into the first mounting groove 36 in order to connect and fix the cavity segment 2 to the transition segment 3. After the coarse mold cavity section 1, the fine mold cavity section 2 and the transition mold section 3 are connected, the transition molding surface 31 of the transition mold section 3 is adjacent to the inner wall of the coarse mold cavity section 1 and the inner wall of the fine mold cavity section 2. In this embodiment, the skirt 38 may be shaped to fit the end of the fine cavity segment 2, and the skirt 38 may be integrally formed with the fine cavity segment 2 or may be separately formed and welded or bonded to the fine cavity segment 2.

Example 5

As shown in fig. 13, 14 and 15, the difference between the mold for manufacturing the precast pile with variable cross section provided in this embodiment and embodiment 3 is that: in the embodiment, the structure of the transition mold section 3 is changed on the basis of the embodiment 3.

Specifically, in the present embodiment, the end surface of the transition die section 3 connected to the end of the cavity section 2 is provided with a weight-reducing groove 39 for reducing the weight and the raw material cost of the transition die section 3.

Example 6

As shown in fig. 16, 17 and 18, the difference between the mold for manufacturing the precast pile with the variable cross section provided in this embodiment and embodiment 1 is that: the connection structure between the coarse mold cavity section 1 and the transition mold section 3 is different.

Specifically, in this embodiment, the second positioning surface 34 and the second connecting surface 35 are formed on the outer wall surface of the transition mold section 3 (i.e., a step is milled on the outer wall of one end of the transition mold section 3 along the circumferential contour line of the outer wall to form the second positioning surface 34 and the second connecting surface 35), and the fastener passes through the rough mold cavity section 1 and then is connected and fixed with the connecting hole 331 of the second connecting surface 35. Similarly, after the coarse cavity segment 1, the fine cavity segment 2 and the transition cavity segment 3 are connected, the transition molding surface 31 of the transition cavity segment 3 abuts against the inner wall of the coarse cavity segment 1 and the inner wall of the fine cavity segment 2.

Example 7

As shown in fig. 19, this embodiment provides a mold set for manufacturing a precast pile with variable cross-section, which includes a plurality of molds for manufacturing precast piles with variable cross-section in any one or more of embodiments 1 to 6, the molds for manufacturing precast piles with variable cross-section are arranged in sequence in the transverse direction, and two adjacent molds for manufacturing precast piles with variable cross-section form a gap at least in the fine mold cavity section 2.

In the structure, a plurality of moulds for manufacturing the variable-section precast piles are transversely and sequentially arranged, a plurality of variable-section precast piles can be produced in one-time production process, the lengths of the variable-section precast piles can be different, and the production efficiency and the universality of the moulds are improved. In addition, two adjacent moulds for manufacturing the precast pile with the variable cross section at least form a gap at the thin mould cavity section 2, so that steam can pass through the gap when steam curing is carried out, and the steam curing effect is improved.

Example 8

As shown in fig. 20, this embodiment provides a method for manufacturing a mold for manufacturing a precast pile with a variable cross section, which is used for manufacturing the mold for manufacturing a precast pile with a variable cross section according to any one of embodiments 1 to 6, and includes the following steps:

a positioning step: positioning the end parts of a part of a coarse mold cavity section 1 or a part of a fine mold cavity section 2 to be assembled and a transition mold section 3;

mounting and fixing: connecting and fixing the end parts of a part of a coarse mold cavity section 1 or a part of a fine mold cavity section 2 to be assembled with a transition mold section 3 by using a fastener; preferably, the end part of the coarse mold cavity section 1 or the fine mold cavity section 2 which is partially required to be assembled is welded and fixed with the end part of the transition mold section 3;

the method also comprises the manufacturing steps of the transition mold section: adopting precision casting or sand casting to form the transition die section 3, or bending and drawing a flat die plate to form the transition die section 3; or, cutting and bending the flat die plate to form the transition die section 3, or stamping, preforming and thermally treating the tubular section to remove stress and then cutting to form the transition die section 3;

and/or, further comprising the step of welding seam processing: and (3) polishing the welding part of the coarse mold cavity section 1 or the fine mold cavity section 2 and the transition mold section 3 so as to enable the inner wall of the coarse mold cavity section 1 and the inner wall of the fine mold cavity section 2 to be in smooth transition.

In the embodiment, the transition mold section manufacturing step, the positioning step, the mounting and fixing step and the welding seam processing step are sequentially performed. For example, the minimum length of the precast pile is 6 meters, so that a part of the transition mold section 3 and the adjacent fine mold cavity section 2 and coarse mold cavity section 1 can be connected into a standard mold section in advance, that is, a part of the transition mold section 3 and the adjacent fine mold cavity section 2 and coarse mold cavity section 1 are connected into a mold with the length of 6 meters in advance, and the connection manner between a part of the transition mold sections 3 in the standard mold section and the adjacent fine mold cavity section 2 and coarse mold cavity section 1 can be welding or bonding or integral molding. For a standard mold section, in which the connection of the coarse mold cavity section 1 or the fine mold cavity section 2 to the transition mold section 3 is welded, a weld processing step is therefore required.

Example 9

On the basis of the above embodiments, in order to save as much concrete material as possible in the practical process of the variable cross-section precast pile mould, the produced variable cross-section precast pile can make full use of the longitudinal bearing capacity provided by the convex part formed by molding the plurality of transition mould sections 3 to make the total acting force of the pile soil close to the limit value of the compressive strength of the pile body, and the advantage of the bearing capacity of the pile body is fully exerted. The local size parameter of the inner cavity of the mold is determined according to the formula Y which is more than or equal to 0.5465X +54.383mm, wherein Y is the lower limit value (namely the minimum value) of the transverse width of the bottom surface of the inner wall of the thin mold cavity section 2 close to the transition mold section 3, and X is the lower limit value of the transverse width of the bottom surface of the inner wall of the thick mold cavity section 1 close to the transition mold section 3.

In this embodiment, a precast pile with a large section of pile body having a side length of 500mm and a total length of 49m is taken as an example, the vertical limit bearing capacity of the variable-section solid pile produced by comparing the constant-section solid pile with the mold provided in this embodiment is calculated according to the formula: q_uk＝βu_pΣq_sikl_i+q_paA_j；

Wherein Q is_uk-the vertical ultimate bearing capacity standard value (kN) of the mono-pile,

beta is the coefficient of increasing resistance on the variable cross section side,

U_p-the perimeter (m) of the pile,

q_sik-the limit side resistance standard value (kPa) of the single pile layer i soil,

l_ithe pile body passes through the thickness (m) of the i-th layer of soil (rock),

q_pa-a standard value of resistance at the extreme end of the pile,

A_j-area of pile end m²。

The pile body strength of the precast pile is calculated according to a formula

(

And (2) obtaining a comprehensive reduction coefficient, fc, compressive strength design value and Am, wherein the minimum cross section area of the pile body is smaller than that of the constant-section solid pile, the design requirement for the pile body strength is higher than that of the soil body around the pile body under the normal condition, the pile body strength designed according to the pile body strength calculation formula is far higher than that of the soil body around the pile body, more concrete materials are wasted by the higher pile body strength design, and the development requirements of green, energy conservation and environmental protection of the concrete prefabricated component are not met.

Through the comparison with constant-section solid piles and variable-section solid piles, the pile body with the size meeting the calculation formula can greatly improve the vertical ultimate bearing capacity on the premise of meeting the use requirement on the strength of the pile body.

Further, in order to ensure the pile body strength of the produced variable-section solid pile, the cross section area of the pile body needs to be increased under the condition that the concrete strength grade is reduced, if the concrete strength grade of the formed variable-section precast pile is higher than or equal to C60, the local size parameter of the inner cavity of the mold is determined according to a formula Y which is more than or equal to 0.5864X +58.352, wherein Y is the lower limit value of the transverse width of the bottom surface of the inner wall of the thin mold cavity section 2 close to the transition mold section 3, and X is the lower limit value of the transverse width of the bottom surface of the inner wall of the thick mold cavity section 1 close to the transition mold section 3.

Further, if the concrete strength grade of the formed precast pile with the variable cross section is higher than or equal to C40, the local size parameter of the inner cavity of the mold is determined according to the formula Y which is more than or equal to 0.6796X +67.635, wherein Y is the lower limit value of the transverse width of the bottom surface of the inner wall of the thin mold cavity section 2 close to the transition mold section 3, and X is the lower limit value of the transverse width of the bottom surface of the inner wall of the thick mold cavity section 1 close to the transition mold section 3.

In addition, the local size parameter of the inner cavity of the mold is determined according to the formula Z which is less than or equal to 0.988X-13.589, wherein Z is the upper limit value (namely the maximum value) of the transverse width of the top surface of the inner wall of the thin mold cavity section 2 close to the transition mold section 3, X is the lower limit value of the transverse width of the bottom surface of the inner wall of the thick mold cavity section 1 close to the transition mold section 3, and X is more than or equal to 250 mm.

The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is defined by the scope defined by the claims, and a plurality of modifications and decorations made by those skilled in the art without departing from the spirit and scope of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a mould of preparation variable cross section precast pile which characterized in that includes: a coarse mould cavity section (1) capable of forming a large section of the precast pile, a fine mould cavity section (2) capable of forming a small section of the precast pile and a transition mould section (3) for connecting the fine mould cavity section (2) and the coarse mould cavity section (1);

wherein at least part of the transition mold section (3) is detachably connected with the adjacent coarse mold cavity section (1) and/or fine mold cavity section (2) so as to enable the inner wall of the coarse mold cavity section (1) and the inner wall of the fine mold cavity section (2) to be smoothly transited.

2. The mould for manufacturing the precast pile with the variable cross section as claimed in claim 1, wherein the transition mould section (3) has a transition molded surface (31) formed on the inner wall, and the transition molded surface (31) is inclined to the central axis of the mould and smoothly connects the inner wall of the fine mould cavity section (2) and the inner wall of the coarse mould cavity section (1).

3. The mould for making the precast pile with the variable cross section according to claim 2, wherein the maximum wall thickness value of the transition mould section (3) is larger than the wall thickness value of the fine mould cavity section (2) and/or the wall thickness value of the coarse mould cavity section (1).

4. The mould for making precast pile with variable cross section according to claim 2 is characterized in that the transition mould section (3) has a wall thickness abrupt change section along the longitudinal direction.

5. The mould for making precast pile with variable cross section according to claim 2 is characterized in that at least a part of the number of transition mould sections (3) is integrally formed with the adjacent coarse mould cavity section (1) or the fine mould cavity section (2).

6. The mould for manufacturing the precast pile with the variable cross section according to claim 1, wherein the local size parameter of the inner wall of the mould is determined according to the formula Y ≧ 0.5465X +54.383mm, wherein Y is the lower limit value of the transverse width of the bottom surface of the inner wall of the fine mould cavity section (2) near the transition mould section (3), and X is the lower limit value of the transverse width of the bottom surface of the inner wall of the coarse mould cavity section (1) near the transition mould section (3).

7. The mold for manufacturing the precast pile with the variable cross section according to claim 1, wherein if the concrete strength grade of the formed precast pile with the variable cross section is higher than or equal to C60, the local size parameter of the inner wall of the mold is determined according to the formula Y ≥ 0.5864X + 58.352;

if the concrete strength grade of the formed variable-section precast pile is higher than or equal to C40, the local size parameter of the inner wall of the mould is determined according to the formula Y being more than or equal to 0.6796X + 67.635.

8. The mould for manufacturing the precast pile with the variable cross section according to claim 6 is characterized in that the local size parameter of the inner wall of the mould is determined according to the formula Z which is less than or equal to 0.988X-13.589, wherein Z is the upper limit value of the transverse width of the top surface of the inner wall of the thin cavity section (2) close to the transition mould section (3), and X is more than or equal to 250 mm.

9. The mould for manufacturing the precast pile with the variable cross section according to claim 1, wherein one end of the transition mould section (3) is provided with a first positioning surface (32) for positioning the longitudinal end of the fine mould cavity section (2) and a first connecting surface (33) for connecting and fixing the longitudinal end of the fine mould cavity section (2),

and/or the other end of the transition die section (3) is provided with a second positioning surface (34) for positioning the longitudinal end of the coarse die cavity section (1) and a second connecting surface (35) for connecting and fixing the longitudinal end of the coarse die cavity section.

10. A mould for making a pre-cast pile with a variable cross-section according to claim 9, characterised in that the first positioning surface (32) is in abutment with the first connection surface (33).

11. A mould for making a pre-cast pile with a variable cross-section according to claim 9, characterised in that said second positioning surface (34) is adjacent to said second connection surface (35).

12. The mould for manufacturing the precast pile with the variable cross section according to claim 9, wherein the first connecting surface (33) of the transition mould section (3) is provided with a connecting hole (331) for connecting with the thin mould cavity section (2), and the first positioning surface (32) and the first connecting surface (33) are coplanar or form a predetermined included angle;

and/or a connecting hole (331) used for being connected with the rough die cavity section (1) is formed in the second connecting surface (35) of the transition die section (3).

13. The mould for making a precast pile with a variable cross section according to claim 12, wherein the second positioning surface (34) and the second connecting surface (35) are coplanar or have a predetermined included angle;

the first connecting surface (33) and the thin die cavity section (2) as well as the second connecting surface (35) and the thick die cavity section (1) are respectively connected and fixed by fasteners.

14. The mould for manufacturing the precast pile with the variable cross section according to claim 2, wherein one end of the transition mould section (3) is formed with a first mounting groove (36) for the end of the fine mould cavity section (2) to be inserted,

and/or a second mounting groove (37) for the end part of the coarse die cavity section (1) to be inserted is formed at the other end of the transition die section (3).

15. The mould for making a precast pile with a variable cross section as claimed in claim 14, wherein the end of the fine mould cavity section (2) is fixed with the first mounting groove (36) by a fastener.

16. The mould for making the precast pile with the variable cross section as claimed in claim 14, wherein the end of the coarse mould cavity section (1) and the second mounting groove (37) are fixed by a fastener.

17. The mould for making the precast pile with the variable cross section according to the claim 14, wherein the end of the fine mould cavity section (2) is inserted into the first mounting groove (36) and is fixedly connected with the transition mould section (3);

and/or the end part of the coarse mold cavity section (1) is inserted into the second mounting groove (37) and is fixedly connected with the transition mold section (3).

18. The mould for manufacturing the precast pile with the variable cross section according to any one of claims 1 to 17, wherein the coarse mould cavity section (1) and the fine mould cavity section (2) are U-shaped mould sections with an upper opening, and a longitudinal central axis of the fine mould cavity section (2) is collinear with a longitudinal central axis of the coarse mould cavity section (1).

19. A set of moulds for making precast piles with variable cross-section, characterized in that it comprises a plurality of moulds for making precast piles with variable cross-section according to any one of claims 1 to 18, which are arranged in series transversely, and two adjacent precast pile moulds form a gap at least in the fine mould cavity section (2).