A top mold frame of a variable-section pile mold

Abstract

The present invention relates to a top formwork frame of a variable-section pile mold, which is located at the upper part of the mold cavity of the mold, and the top formwork frame includes the bottom of the opposite sides thereof, which are formed with at least one flat part and at least one expansion part which are alternately arranged in sequence along the length direction of the mold, and the flat part and the expansion part on one side correspond to the flat part and the expansion part on the other side respectively, the expansion part is upwardly convex relative to the flat part, and the lower part of the expansion part is undulating with the lower part of the flat part, and a strip-shaped hollow area extending along the length direction of the mold is provided between the opposite sides of the top formwork frame, and the strip-shaped hollow area is used for inserting a scraper and allowing the scraper to move along the flat part and the expansion part which are alternately arranged in sequence. The present invention uses a scraper to scrape the concrete on the upper part of the mold cavity along the trajectory of the undulating flat part and the expansion part, so that the concrete on the upper part of the mold cavity can be flush with the undulating flat part and the expansion part at the corresponding position, and finally the top surface of the formed pile can present a concave-convex surface.

Description

Technical Field

[0001] The invention relates to the technical field of building moulds, in particular to a top mould frame of a variable-section pile mould. Background Art

[0002] Reinforced concrete precast piles are generally round or square piles prefabricated in factories through molds, and then transported to the location of the pile. In actual application, this type of precast piles has shown advantages such as strong load capacity, small settlement deformation, simple construction, low cost and high efficiency, so they have been widely used in pile foundation projects. Existing concrete precast piles are usually straight piles with the same cross-sectional shape and size. However, this type of precast pile generally has the problem of large concrete consumption and poor pull-out bearing capacity.

[0003] In view of the above problems, variable cross-section piles (piles whose cross-sectional dimensions and shapes change along the length of the pile) are increasingly favored by the construction industry because their respective structural forms are different from those of ordinary straight piles, and they have better pull-out resistance and bearing performance. The production of variable cross-section piles requires a corresponding mold for forming variable cross-section piles. In the prior art, a mold for forming variable cross-section piles is disclosed. As shown in the "A Mold for Forming Variable Cross-Section Piles" disclosed in the Chinese utility model patent with patent number ZL201820786418.3 (announcement number CN208263086U), the mold cavity of the mold forms at least one regular polygonal coarse hole segment and at least one regular polygonal fine hole segment along the length direction, and the regular polygonal coarse hole segment and the regular polygonal fine hole segment are connected; wherein, the hole wall of the regular polygonal fine hole segment is provided with at least one groove, and the length direction of the groove is consistent with the length direction of the mold; the mold forms a variable cross-section pile with a regular polygonal cross section in the cross section of the regular polygonal coarse hole segment.

[0004] The mold for forming this type of variable-section pile produces the pile by adding concrete to the mold cavity in the form of cloth. The side of the pile corresponding to the upper mold plate or the top mold plate of the mold presses down the concrete in the hope of making the top surface of the pile also concave and convex. Although the top mold plate of this type of mold can press down the compacted concrete in the mold cavity, in practice the top surface of the pile fails to form a concave and convex surface. To address this phenomenon, relevant technical personnel can only lower the requirements for the variable-section pile and make the side of the top mold plate opposite to the mold cavity into a flat surface. The variable-section pile with a flat side is prepared by this type of mold. As time goes by, there has not been a suitable top mold plate that can support the production of variable-section piles with a concave and convex top surface after cooperating with the mold for many years (the top surface of the pile is the side facing the upper mold plate or the top mold plate of the mold). Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a top mold frame of a variable-section pile mold which can produce a pile with a concave-convex top surface after being matched with a mold in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a top formwork frame of a variable-section pile mold, the top formwork frame is located at the upper part of the mold cavity of the mold, the top formwork frame includes the bottom of the opposite sides thereof, both of which form at least one flat portion and at least one expansion portion alternately arranged in sequence along the length direction of the mold, and the flat portion and the expansion portion on one side respectively correspond to the flat portion and the expansion portion on the other side, the expansion portion protrudes upward relative to the flat portion, and the lower part of the expansion portion and the lower part of the flat portion are undulating on the mold cavity, and a strip-shaped hollow area extending along the length direction of the mold is opened between the opposite sides of the top formwork frame, the strip-shaped hollow area is used for inserting a scraper, and after the scraper moves along the flat portions and the expansion portions alternately arranged in sequence, the concrete in the upper part of the mold cavity forms a concave and convex surface.

[0007] In order to ensure that the top mold frame can be fixed relative to the top mold frame after being placed on the mold, the top mold frame also includes two side plates that are arranged opposite to each other and can respectively abut against the two side walls of the mold cavity, and the side plates are provided with notches for the expansion part to be placed, and both edges of the expansion part in the width direction extend out of the side plates. During assembly, the top mold frame is positioned by abutting the side plates against the side walls of the mold cavity, otherwise the top mold frame is prone to displacement, and the relative position between the top mold frame and the mold cavity cannot be guaranteed. The side plates are easy to grasp and also facilitate the placement and removal of the top mold plate.

[0008] In order to ensure the firmness of the overall structure of the top formwork, at least one reinforcing rib extending along the width direction of the strip-shaped hollow area is provided between the two side plates. The reinforcing rib can play a certain reinforcing role and prevent the top formwork from deforming.

[0009] In order to make the flattened portions on opposite sides correspond one-to-one and the expanded portions on opposite sides correspond one-to-one, extension rods facing the strip-shaped hollow area are provided on opposite sides of the top mold frame. When the extension rods on opposite sides of the top mold frame are located in the same straight line, the flattened portion and the expanded portion on one side of the top mold frame correspond one-to-one with the flattened portion and the expanded portion on the other side respectively, and the extension rods on opposite sides of the top mold frame are integrally formed, or the extension rods on opposite sides of the top mold frame can be butt-jointed or spaced apart from each other in the width direction of the mold cavity. In the case where the extension rods are integrally formed, when making the top formwork, the flat portions on the opposite sides correspond one-to-one, and the expanded portions on the opposite sides correspond one-to-one, and there is no need to make adjustments when the top formwork is assembled on the mold; if the extension rods on the opposite sides are split designs, as long as the extension rods on the opposite sides are adjusted to be located on the same straight line, the flat portions on the opposite sides correspond one-to-one, and the expanded portions on the opposite sides correspond one-to-one, thereby ensuring that the produced pile shape is qualified, otherwise the flat portions or expanded portions on both sides do not correspond, then misalignment will occur between the concave and convex surfaces on the top surface of the formed pile, and the split design of the extension rods on the opposite sides can adapt to the size adjustment of the top formwork in the width direction.

[0010] In order to quickly and conveniently install the top mold frame in place, the top mold frame also includes at least one positioning member for positioning the top mold frame and can be installed on the mold, and the positioning member is connected to the side plate. In this way, when the positioning member is installed on the mold, the top mold frame is installed in place, and there is no need to adjust the position of the top mold frame multiple times, and the top mold frame can be prevented from being displaced relative to the mold cavity. Because a liner is provided in the mold cavity, the expansion part on the top mold frame and the liner need to be alternately arranged in the length direction of the mold cavity, and the flattening part on the top mold frame and the liner need to be correspondingly arranged in the length direction of the mold cavity. The arrangement of the positioning member makes the installation of the top mold plate quick and convenient, and in place at one time. The expansion part is located exactly between the two liner plates, which also ensures that the pile shape of the variable-section square pile is qualified.

[0011] Specifically, the positioning member is mounted on the upper end surfaces of the two side plates and extends along the width direction of the top mold frame, and the positioning member at least partially extends out of the side plate to be installed on the mold. The form in which the positioning member is mounted on the upper end surface of the side plate not only facilitates the installation of the positioning member on the mold, but also facilitates the grasping of the positioning member to make the top mold frame move synchronously.

[0012] The structure is simple, and the positioning member is a positioning rod with side plates extending from both ends and capable of being installed on the mold.

[0013] In order to make the positioning member adapt to the size adjustment of the top mold frame, the opposite sides of the top mold frame can be close to or away from each other along its width direction, and the positioning member includes two connecting rods that can move relative to each other in the length direction. Each side plate is correspondingly fixed with one of the above connecting rods. The first end of each connecting rod extends out of the side plate on the corresponding side to be installed on the mold, and the second ends of the two connecting rods are detachably connected at different positions in the length direction of the connecting rods. When the size of the top mold frame in the width direction needs to be adjusted, the second ends of the two connecting rods are connected at different positions, and the total length of the positioning member can be adjusted.

[0014] Preferably, each connecting rod is provided with a first positioning hole at a position adjacent to the second end, wherein the number of first positioning holes on one connecting rod is at least one, and the number of first positioning holes on the other connecting rod is at least two and spaced apart along the length direction of the connecting rod, and two adjacent connecting rods are connected at one of the first positioning holes by a connecting piece. The total length of the positioning piece can be adjusted by connecting two adjacent connecting rods at different first positioning holes, and the length adjustment method is simple and quick.

[0015] The edge of the flattening part is extended from the side of the expansion part away from the strip hollowing area, and the extended part of the expansion part is located between two adjacent lining plates, which can position the top formwork frame and also ensure the integrity of the shape of the pile; and the expansion part includes a horizontal section and an inclined section connecting the horizontal section and the flattening part, and the outer end surface of the inclined section extending from the flattening part is an inclined surface inclined from the horizontal section to the flattening part toward the flattening part. Because the lining plate has an inclined connection part, the outer end surface on the expansion part can have better sealing after matching with the lining plate on the corresponding side, and will not leak slurry at the matching place, which is helpful for demoulding the pile and ensures the integrity of the shape of the pile.

[0016] Compared with the prior art, the advantages of the present invention are as follows: the bottoms of the opposite sides of the top formwork of the present invention are formed with flattened parts and expansion parts that are undulating along the length direction of the mold, and a strip-shaped hollow area is opened between the opposite sides of the top formwork, and a scraper that can slide along the contour of the length direction of the mold is inserted into the strip-shaped hollow area, and the scraper moves along the trajectory of the undulating flattened parts and expansion parts to scrape the concrete on the upper part of the mold cavity, so that the top surface of the concrete at the strip-shaped hollow area can be flush with the top surfaces of the concrete at the corresponding undulating flattened parts and expansion parts, respectively, and finally the top surface of the formed pile can present a concave and convex surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the top mold frame of Example 1 of the present invention;

[0018] Figure 2 for Figure 1 Schematic diagram of the decomposition of

[0019] Figure 3 for Figure 2Schematic diagram of the local structure in;

[0020] Figure 4 For application Figure 1 A schematic diagram of the structure of the mold of the top mold frame;

[0021] Figure 5 for Figure 4 Schematic diagram of the decomposition of

[0022] Figure 6 for Figure 5 A schematic diagram of the structure of the support frame;

[0023] Figure 7 for Figure 2 A in the enlarged view;

[0024] Figure 8 for Figure 5 The enlarged view of point B in the figure;

[0025] Fig. 9 for Figure 5 The enlarged view of point C in the figure;

[0026] Fig.10 It is a schematic structural diagram of the top mold frame of Example 2 of the present invention;

[0027] Fig.11 For application Fig.10 A schematic diagram of the structure of the mold of the top mold frame;

[0028] Fig.12 for Fig.11 The enlarged view of D in the figure;

[0029] Fig.13 This is a schematic structural diagram of the top mold frame of Example 3 of the present invention (the extension rods on the opposite sides are in a docking state);

[0030] Fig.14 This is a schematic structural diagram of the top mold frame of Example 3 of the present invention (the extension rods on the opposite sides are in a distanced state);

[0031] Fig.15 For application Fig.13 A schematic diagram of the structure of the mold of the top mold frame;

[0032] Fig.16 It is a schematic structural diagram of the top mold frame of Example 4 of the present invention (the extension rods on the opposite sides are in a distanced state);

[0033] Fig.17 for Fig.16 A schematic diagram of a structure in which the positioning member is assembled on a mounting frame;

[0034] Fig.18 for Fig.17 A schematic diagram of the structure of the positioning member in FIG.

[0035] Fig.19 For application Fig.16 A schematic diagram of the structure of the mold of the top mold frame;

[0036] Fig. 20 is an exploded schematic diagram of another mold;

[0037] Fig.21 is an exploded schematic diagram of another mold;

[0038] Fig. 22 A schematic diagram of the structure of another mold. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings.

[0040] In the following embodiments, the formed variable-section square pile 011 is taken as an example to describe the structures of the top mold frames 01 with different structural forms and the molds matched therewith.

[0041] Example 1

[0042] like Figures 1 to 9 As shown, taking the forming of variable-section square piles 011 as an example, the structure of the top mold frame 01 and a mold matched therewith is described in detail. In addition to the top mold frame 01 that matches therewith, the mold also includes a bottom mold plate 6 and two side mold plates 7. The top mold frame 01 and the bottom mold plate 6 are arranged opposite to each other up and down, and the two side mold plates 7 are both arranged on the bottom mold plate 6 and are arranged opposite to each other along the width direction of the bottom mold plate 6. The bottom mold plate 6 and the two side mold plates 7 enclose a mold cavity 15 for forming the square piles 011, and the top mold frame 01 is located at the upper part of the mold cavity 15 of the mold.

[0043] The top mold frame 01 includes a side plate 3, an extension rod 1, and at least one flat portion 11 and at least one expansion portion 12 formed at the bottom of the opposite sides thereof and arranged alternately in sequence along the length direction of the mold. In this embodiment, the flat portion 11 and the expansion portion 12 are both made of metal, such as iron, steel, etc.

[0044] A strip-shaped hollow area 13 extending along the length direction of the mold is provided between the opposite sides of the top mold frame 01, and both sides of the strip-shaped hollow area 13 in the width direction are flattened parts 11 and expansion parts 12 arranged alternately in sequence. More specifically, the opposite sides of the top mold frame 01 are the first side 1a and the second side 1b arranged oppositely, that is, the first side 1a and the second side 1b of the top mold frame 01 are at least one flattened part 11 and at least one expansion part 12 arranged alternately in sequence along the length direction of the mold, and the first side 1a and the second side 1b are always in a flush state. In this embodiment, the flattened part 11 and the expansion part 12 on the same side are integrally formed; and the flattened part 11 on the first side 1a corresponds to the flattened part 11 on the second side 1b one by one, and the expansion part 12 on the first side 1a corresponds to the expansion part 12 on the second side 1b one by one, and the expansion part 12 on the same side is upwardly protruding relative to the flattened part 11 adjacent thereto, and the lower part of the expansion part 12 and the lower part of the flattened part 11 are undulating on the mold cavity 15. Furthermore, the lower end surface of the expansion portion 12 and the lower end surface of the flattening portion 11 are both in a smooth state, so as to ensure that the surface of the formed pile is smooth.

[0045] The strip hollow area 13 is used for placing the scraper 2 and allowing the scraper 2 to move along the alternating flat part 11 and the expansion part 12. In order to improve the working reliability of the scraper 2, in this embodiment, the flat part 11 and the expansion part 12 have the same thickness, and the scraper 2 includes a scraper 21 and a resting part 22 formed on the upper part of the scraper 21. The two ends of the resting part 22 are respectively mounted on the opposite sides of the top formwork frame 01. The scraper 21 extends into the strip hollow area 13, and the thickness of the scraper 21 is the same as that of the flat part 11, so that the lower end surface of the scraper 21 is always flush with the lower end surface of the flat part 11 or the expansion part 12, so as to ensure that the concrete top surface corresponding to the strip hollow area 13 can be flush with the concrete top surface at the corresponding undulating flat part 11 and expansion part 12.

[0046] The side of the expansion portion 12 away from the strip-shaped hollow area 13 extends beyond the edge of the flat portion 11, and the side close to the strip-shaped hollow area 13 is flush with the edge of the flat portion 11. Figures 7 to 9 As shown, the expansion portion 12 includes a horizontal section 121 and an inclined section 122 connecting the horizontal section 121 and the flat portion 11. The lower end surface of the horizontal section 121 is higher than the lower end surface of the flat portion 11. The outer end surface 123 of the inclined section 122 extending from the flat portion 11 is an inclined surface inclined from the horizontal section 121 to the flat portion 11 toward the flat portion 11. The aforementioned outer end surface 123 refers to the end surface of the inclined section 122 away from the strip-shaped hollow area 13.

[0047] A plurality of lining plates are arranged in the mold cavity 15 along its length direction to make the formed square pile 011 have a contraction section (the cross-sectional dimension at the contraction section is smaller than the cross-sectional dimension at other positions of the pile body), and the lining plates are arranged corresponding to the bottom template 6 and the two side templates 7. Each lining plate includes a side lining plate 8 arranged on the side template 7 and a bottom lining plate arranged on the bottom template 6. The side lining plate 8 includes a side lining plate body 81 arranged parallel to the side template 7 and a connecting portion 82 formed on both sides of the side lining plate body 81, and the connecting portion 82 extends away from the side lining plate body 81 and is inclined toward the side template 7 on the corresponding side. When the top mold frame 01 is placed on the mold cavity 15, the part of the expansion portion 12 extending out of the edge of the flattened portion 11 is located between two adjacent side lining plates 8, and the aforementioned outer end surface 123 abuts against the connecting portion 82, so that the sealing between the top mold frame 01 and the side lining plate 8 is good to prevent leakage of slurry, and the inclined surface matching between the side lining plate 8 and the expansion portion 12 is also convenient for demoulding.

[0048] There are two side plates 3 and they are arranged opposite to each other, one of which is arranged on the first side 1a of the top mold frame 01, and the other side plate 3 is arranged on the second side 1b of the top mold frame 01. Each side plate 3 is provided with a notch 31 for the corresponding expansion portion 12 to be placed, and both edges of the expansion portion 12 in the width direction extend out of the side plate 3. Specifically, the inner edge of the expansion portion 12 extends out of the side plate 3 for the scraper 2 to be placed, the outer edge of the expansion portion 12 extends out of the side plate 3 to be clamped between the two side lining plates 8, the inner edge of the flattening portion 11 extends out of the side plate 3 for the scraper 2 to be placed, and the outer edge of the flattening portion 11 is flush with the side plate 3. Here, the inner side refers to the side close to the strip hollow area 13, and the outer side refers to the side away from the strip hollow area 13. When the top mold frame 01 is placed in place in the mold cavity 15, the two side plates 3 respectively abut against the side lining plates 8 on the two side mold plates 7.

[0049] In addition, a plurality of reinforcing ribs 4 for reinforcing the top formwork 01 are arranged at intervals between the two side plates 3 along the length direction of the side plates 3 , and each reinforcing rib 4 extends along the width direction of the strip-shaped hollow area 13 .

[0050] In this embodiment, both ends of the first side 1a and the second side 1b of the top mold frame 01 in the length direction are provided with extension rods 1 facing the strip hollow area 13, the extension rod 1 at the head of the first side 1a corresponds to the extension rod 1 at the head of the second side 1b, the extension rod 1 at the tail of the first side 1a corresponds to the extension rod 1 at the tail of the second side 1b, and when the two corresponding extension rods 1 are located on the same straight line, the flattened portion 11 of the first side 1a corresponds to the flattened portion 11 of the second side 1b, and the expansion portion 12 of the first side 1a corresponds to the expansion portion 12 of the second side 1b. In this embodiment, the two corresponding extension rods 1 are integrally formed, that is, when the top mold frame 01 is manufactured, the flattened portions 11 or expansion portions 12 on the opposite sides correspond to each other, otherwise the flattened portions 11 or expansion portions 12 on the opposite sides are misaligned, and the formed pile-shaped top surface will not be a concave and convex surface that alternates in sequence.

[0051] Through the structure of the top formwork frame 01, the top surface of the pile can be set to a concave-convex surface by the following method: 1. First, place the top formwork frame 01 in the mold cavity 15 and put it in place; 2. Pour enough concrete into the mold cavity 15 through a distribution device (such as a distribution vehicle), and vibrate the concrete in the mold to make it dense and uniform through a vibrator, so that the height of the top surface of the concrete is higher than the strip hollow area 13, specifically higher than the upper end surface of the flat part 11, and lower than the upper end surface of the expansion part 12; 4. Manually move the scraper 2 to move the scraper 2 along the length direction of the strip hollow area 13, and the scraper 2 moves along the trajectory of the undulating flat part 11 and the expansion part 12 to scrape the concrete on the upper part of the mold cavity 15, so that the concrete top surface corresponding to the strip hollow area 13 can be flush with the concrete top surfaces at the corresponding undulating flat part 11 and the expansion part 12, respectively, so that the top surface of the formed square pile 011 can finally present a concave-convex surface; and during the movement of the scraper 2, the excess material at the flat part 11 can be filled into the expansion part 12.

[0052] In addition, if Figure 5 , 6 As shown, one of the side mold plates 7 of the present embodiment can be moved along the bottom mold plate 6 in the following manner. After the side mold plate 7 moves, the lateral width of the mold cavity 15 of the mold increases or decreases. For this purpose, a top mold frame 01 with an enlarged lateral dimension or a top mold frame 01 with a reduced lateral dimension needs to be configured. The following specific structure supports the movement of the side mold plate 7 relative to the bottom mold plate 6:

[0053] A plurality of support frames 61 are provided at intervals along the length direction of the bottom template 6, each support frame 61 includes a support plate 611 supported at the bottom of the bottom template 6 and two reinforcing plates 612 connected to the support plate 611, the support plate 611 extends along the width direction of the bottom template 6, each side template 7 is connected to a corresponding reinforcing plate 612 arranged on its outer side, and one of the reinforcing plates 612 can move relative to the support plate 611 along the width direction of the bottom template 6, and the side template 7 connected to the reinforcing plate 612 can also move along the bottom template 6.

[0054] The end of the support plate 611 is provided with a plurality of second positioning holes 613 spaced apart along the sliding direction of the reinforcing plate 612, and the support plate 611 is formed with a groove channel 614 in the area where the second positioning holes 613 are located. The movable reinforcing plate 612 is arranged in the corresponding groove channel 614 and can move along the groove channel 614, and a connecting piece 615 (such as a pin) that can be pressed against the end surface of the reinforcing plate 612 facing the side template 7 is inserted in the second positioning hole 613.

[0055] On the side of the movable reinforcing plate 612, a vertical plate 616 parallel to the corresponding side template 7 is fixed on the support plate 611, and the vertical plate 616 and the side template 7 are separated on both sides of the reinforcing plate 612. A transverse abutment rod 617 is arranged between the vertical plate 616 and the reinforcing plate 612. The transverse abutment rod 617 is screwed with the vertical plate 616, and the screwing direction of the two is perpendicular to the direction of the vertical plate 616, and one end face of the transverse abutment rod 617 abuts against the end face of the reinforcing plate 612 facing away from the side template 7. The transverse abutment rod 617 can be simply selected as a bolt or a screw, or a flat plate with an increased abutment area can be arranged on the abutment surface with the reinforcing plate 612 to expand the abutment stability, etc. These simple deformations of the transverse abutment rod 617 are all within the protection scope of the present invention.

[0056] When the position of the reinforcing plate 612 needs to be adjusted and moved, the connecting member 615 is inserted into the second positioning hole 613 at a different position, and the transverse abutment rod 617 maintains the abutment state with the first vertical rod by screwing with the vertical plate 616 .

[0057] Alternatively, a connection hole corresponding to the second positioning hole 613 may be provided on the reinforcing plate 612 , and the connecting member 615 is inserted into the connection hole and the second positioning hole 613 .

[0058] Example 2

[0059] like Figures 10-12 As shown, the difference between Example 2 and Example 1 is that the top mold frame 01 of this embodiment is not provided with reinforcing ribs 4, and a plurality of positioning members 5 are provided on the top mold frame 01 at intervals along the length direction. The positioning members 5 not only have the function of reinforcing the top mold frame 01 with the reinforcing ribs 4, but also can position the top mold frame 01 to prevent the top mold frame 01 from being displaced relative to the mold cavity 15.

[0060] like Figures 1-2 As shown, the positioning member 5 is a positioning rod mounted on the upper end surface of the two side panels 3, and each positioning rod extends along the width direction of the strip hollow area 13. The middle part of the positioning rod is fixedly connected to the two side panels 3 to reinforce the two side panels 3. Both ends of the positioning rod extend out of the side panels 3, and both side templates 7 are provided with mounting frames 9 for the corresponding installation of the two ends of the positioning member 5. In this embodiment, a mounting groove 91 is provided on the mounting frame 9, and the positioning rod can be inserted into the mounting groove 91 from top to bottom. Of course, the positioning rod can also be installed on the mounting frame 9 in other forms, such as the positioning rod is installed on the mounting frame 9 through a buckle structure. In this way, not only can the positioning rod be disassembled, but also when the positioning rod is assembled on the mounting frame 9, because the positioning rod cannot move axially, it can also prevent the side template 7 from being stretched out by concrete and deforming outward, thereby reinforcing the mold.

[0061] Example 3

[0062] like Figures 13-15As shown, the difference between Example 3 and Example 2 is that: a. the size of the top mold frame 01 in the width direction can be adjusted; b. the structure of the positioning member 5 is different and its length can be adjusted to adapt to the distance between the two side mold plates 7. These two distinguishing features enable the top mold frame 01 of this embodiment to adapt to molds of different sizes.

[0063] The opposite sides of the top mold frame 01 are designed to be split, and can be moved closer to or farther from each other in the width direction of the mold cavity 15. The opposite sides of the top mold frame 01 can be moved manually or by mechanical equipment to adjust the spacing between the opposite sides. The extension rod 1 of the first side 1a and the extension rod 1 of the second side 1b of the top mold frame 01 are designed to be split, and the extension rod 1 at the head of the first side 1a and the extension rod at the head of the second side 1b are always located on the same straight line and can be correspondingly docked or separated in the width direction of the mold. The extension rod 1 at the tail of the first side 1a and the extension rod at the tail of the second side 1b are always located on the same straight line and can be correspondingly docked or separated in the width direction of the mold, so that the size of the top mold frame 01 in the width direction can be adjusted.

[0064] The length of the positioning member 5 can be adjusted to fit the spacing between the two side templates 7: the positioning member 5 includes two connecting rods 51 that can move relative to each other in the length direction, one of the above-mentioned connecting rods 51 is correspondingly fixed on each side plate 3, the first end of each connecting rod 51 is correspondingly mounted on the mounting frame 9 on the corresponding side template 7, and a first positioning hole 511 is provided at a position adjacent to the second end of each connecting rod 51, the number of the first positioning holes 511 on one of the connecting rods 51 is at least one, and the number of the first positioning holes 511 on the other connecting rod 51 is at least two and is spaced apart along the length direction of the connecting rod 51, and two adjacent connecting rods 51 are connected at one of the first positioning holes 511 by a connecting member (such as a pin), and the total length of the positioning member 5 is adjusted by connecting the two connecting rods 51 at the first positioning holes 511 at different positions. In this embodiment, each connecting rod 51 includes a first rod 51a and a second rod 51b that are connected, the first rod 51a is mounted on the mounting frame 9, and the first positioning hole 511 is opened on the second rod 51b.

[0065] Example 4

[0066] like Figures 16 to 19 As shown, the difference between Embodiment 4 and Embodiment 3 is that the first end of each connecting rod 51 can be detachably mounted at a different height position of the corresponding mounting frame 9, and the structure of the mounting frame 9 is different.

[0067] At least two steps 91 are provided on the mounting frame 9 in the height direction, and a placing portion 512 that can be placed on the step 91 is provided at the first end of each connecting rod 51. By placing the placing portion 512 on steps 91 of different heights, the installation height of the positioning member 5 can be adjusted. In addition, a slot 911 for inserting the corresponding connecting rod 51 is provided at each step 91, and a convex portion 513 that can be inserted and limited in the slot 911 is provided on each connecting rod 51. Specifically, the convex portion 513 is provided on the first rod 51a.

[0068] The top surface of the pile can also be set to a concave or convex surface by the following method:

[0069] like Fig. 20 As shown, the top template includes at least one flat section 101 and at least one expansion section 102 alternately arranged in sequence along its length direction. When the top template is located at the upper part of the mold cavity 15, each expansion section 102 is located between two adjacent side lining plates 8. A first feed port 103 for injection is provided on the expansion section 102. A vibrator 104 is fixed above the top template 01. After filling, the vibrator 104 vibrates to make the concrete in the mold more compact and uniform.

[0070] like Fig.21 As shown, the top formwork includes a plurality of top formwork units 105, each of which is located between two adjacent side lining plates 8, and each of which is provided with a second feed port 106 for pouring concrete. First, a pile with a flat top surface as described in the prior art is made, and then the top formwork unit 105 is placed on the top of the formed pile, and concrete is poured from the second feed port 106, thereby forming a convex portion on the top surface of the pile, so that the top surface of the pile is finally formed into a concave-convex surface.

[0071] like Fig. 22 As shown, a pile with a flat top surface as in the prior art is first made, and then a precast concrete slab 107 is placed on the top of the formed pile, and each precast concrete slab 107 is located between two adjacent side lining plates 8, thereby forming a convex portion on the top surface of the pile, so that the top surface of the pile is finally formed into a concave-convex surface.

Claims

1. A top mold frame of a variable cross-section pile mold, the top mold frame (01) is located at the upper part of the mold cavity (15) of the mold, characterized in that: The top formwork frame (01) includes at least one flattened portion (11) and at least one expanded portion (12) formed on the bottom of the opposite sides thereof, which are alternately arranged in sequence along the length direction of the mold, and the flattened portion (11) and the expanded portion (12) on one side correspond to the flattened portion (11) and the expanded portion (12) on the other side, respectively, the expanded portion (12) protrudes upward relative to the flattened portion (11), and the lower portion of the expanded portion (12) and the lower portion of the flattened portion (11) are undulating on the mold cavity (15), and a strip-shaped hollow area (13) extending in the length direction of the mold is provided between the opposite sides of the top formwork frame (01), and the strip-shaped hollow area (13) is used for placing a scraper (2), so that after the scraper (2) moves along the flattened portions (11) and the expanded portions (12) alternately arranged in sequence, the concrete on the upper part of the mold cavity (15) forms a concave-convex surface.

2. The top formwork of the variable cross-section pile mold according to claim 1, characterized in that: The top mold frame (01) further comprises two side plates (3) which are arranged opposite to each other and can respectively abut against the two side walls of the mold cavity (15); the side plates (3) are provided with recesses (31) for the expansion portion (12) to be placed therein, and both edges of the expansion portion (12) in the width direction extend out of the side plates (3).

3. The top mold frame of the variable cross-section pile mold according to claim 2 is characterized in that: At least one reinforcing rib (4) extending along the width direction of the strip-shaped hollow area (13) is provided between the two side plates (3).

4. The top formwork of the variable cross-section pile mold according to claim 1, characterized in that: Extension rods (1) facing the strip-shaped hollow area (13) are provided on opposite sides of the top mold frame (01); when the extension rods (1) on opposite sides of the top mold frame (01) are located in the same straight line, the flattened portion (11) and the expanded portion (12) on one side of the top mold frame (01) correspond to the flattened portion (11) and the expanded portion (12) on the other side respectively; The extension rods (1) on the opposite sides of the top mold frame (01) are integrally formed, or the extension rods (1) on the opposite sides of the top mold frame (01) can be butted against or spaced apart from each other in the width direction of the strip-shaped hollow area (13).

5. The top mold frame of the variable cross-section pile mold according to claim 2, characterized in that: The top mold frame (01) also includes at least one positioning member (5) used for positioning and capable of being installed on the mold, wherein the positioning member (5) is connected to the side plate (3).

6. The top formwork of the variable cross-section pile mold according to claim 5, characterized in that: The positioning member (5) is mounted on the upper end surfaces of the two side plates (3) and extends along the width direction of the top mold frame (01), and the positioning member (5) at least partially extends out of the side plates (3) to be installed on the mold.

7. The top formwork of the variable cross-section pile mold according to claim 6, characterized in that: The positioning member (5) is a positioning rod with both ends extending out of the side plate (3) and capable of being installed on the mold.

8. The top formwork of the variable cross-section pile mold according to claim 6, characterized in that: The opposite sides of the top mold frame (01) can move closer to or farther from each other along its width direction. The positioning member (5) includes two connecting rods (51) that can move relative to each other in the length direction. One of the connecting rods (51) is correspondingly fixed to each of the side plates (3). The first end of each of the connecting rods (51) extends out of the side plate (3) on the corresponding side to be installed on the mold. The second ends of the two connecting rods (51) are detachably connected at different positions in the length direction of the connecting rods (51).

9. The top formwork of the variable cross-section pile mold according to claim 8, characterized in that: A first positioning hole (511) is provided at a position adjacent to the second end of each connecting rod (51), wherein the number of the first positioning holes (511) on one connecting rod (51) is at least one, and the number of the first positioning holes (511) on the other connecting rod (51) is at least two and are spaced apart along the length direction of the connecting rod (51), and two adjacent connecting rods (51) are connected at one of the first positioning holes (511) via a connecting piece.

10. The top formwork of the variable cross-section pile mold according to claim 1, characterized in that: The expansion portion (12) extends out of the edge of the flat portion (11) on a side away from the strip-shaped hollow area (13), and the expansion portion (12) comprises a horizontal section (121) and an inclined section (122) connecting the horizontal section (121) and the flat portion (11), and an outer end surface (123) of the inclined section (122) extending out of the flat portion (11) is an inclined surface that is inclined from the horizontal section (121) to the flat portion (11) and is inclined toward the flat portion (11).

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