Prestressed centrifugal solid circular pile and preparation process thereof

Abstract

The invention relates to a preparation process of a prestressed centrifugal solid circular pile, which comprises the following steps: S1, designing a mold of the solid circular pile according to the actual requirements of a field pile foundation, and coating a layer of isolating layer on the mold before pouring, s2, a required pile body reinforcement cage is machined according to the size of the prefabricated square pile to be prepared, and an integral framework is assembled; s3, designing a theoretical mix proportion of the concrete, determining an actual mix proportion after test adjustment, and preparing the concrete according to the actual mix proportion; s4, the overall framework is installed in a mold, prestress tensioning is conducted through a tensioning machine, and then anchoring is conducted; and S5, concrete in the actual proportion is poured, and the solid circular pile is obtained. The shear resistance and bending resistance of the prepared solid circular pile are better than those of a solid square pile, raw materials are greatly reduced, and energy conservation and emission reduction are effectively achieved. The invention further relates to the prestressed centrifugal solid circular pile.

Description

Technical Field

[0001] This invention relates to the field of precast pile technology, and in particular to a prestressed centrifugal solid circular pile and its manufacturing process. Background Technology

[0002] Precast piles are piles that are manufactured in advance and then transported to the construction site. Because of the pre-preparation and curing process, the strength of the precast piles can be controlled, thus allowing for better quality control. Furthermore, using precast pile foundations can significantly shorten the construction period and enable continuous construction. Concrete precast block molds are molds specifically customized to certain dimensions and specifications for finished concrete products.

[0003] Currently, most solid precast piles in China are square-shaped. Square piles are larger than round piles, which consumes more raw materials. This represents a significant turning point for the national advocacy of energy conservation and emission reduction. Furthermore, solid square piles do not have strong penetrating power in complex soil conditions.

[0004] It is hoped that a prestressed centrifugal solid circular pile, its manufacturing process, and a special mold can be provided to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a manufacturing process for prestressed centrifugal solid circular piles. The solid circular piles prepared have better shear and bending resistance than solid square piles, and the raw materials are greatly reduced, effectively achieving energy conservation and emission reduction.

[0006] To achieve the above-mentioned objectives, a manufacturing process for prestressed centrifugal solid circular piles is provided, comprising the following steps:

[0007] S1. Design a mold for solid circular piles according to the actual requirements of the pile foundation on site. The cavity of the mold is circular, and an isolation layer is applied before pouring.

[0008] S2. Process the required pile reinforcement cage according to the dimensions of the precast square pile to be prepared, and assemble it into an integral skeleton;

[0009] S3. Design the theoretical mix proportion of concrete, conduct experiments and adjustments to determine the actual mix proportion, and prepare concrete according to the actual mix proportion;

[0010] S4. Install the overall frame into the mold, perform prestressing tensioning using a tensioning machine, and then anchor it;

[0011] S5. Pour the concrete according to the actual mix proportion to obtain a solid round pile.

[0012] Preferably, in step S1, the inner edges of the cavity of the mold for the solid round pile are all rounded.

[0013] In step S3, the concrete comprises the following components by weight: 320-390 parts silicate cement, 410-490 parts coarse sand, 150-280 parts medium-coarse sand, 1000-1200 parts crushed stone, 130-180 parts water, 20-30 parts steel slag, 30-50 parts siliceous iron tailings powder, 20-25 parts gypsum, 15-22 parts high-calcium ash, 25-45 parts silica fume, 1.3-1.9 parts polycarboxylate superplasticizer, 1-1.2 parts sodium molybdate, 5-10 parts styrene-butadiene latex, 0.5-1 part stannous chloride, 20-30 parts natural zeolite ultrafine powder, 1-1.5 parts air-entraining agent, and 220-400 parts ultrafine fly ash.

[0014] Preferably, in step S5, a screw extrusion feed is used to achieve a concrete density of 99%.

[0015] Preferably, in step S5, after pouring the concrete with the actual mix proportions, the concrete is centrifuged to shape the air bubbles on the outer wall of the solid round pile.

[0016] Preferably, the centrifugation process is as follows: the tensioned and anchored centrifugal pile with mold is hoisted above the centrifuge and accelerated step by step according to the centrifugation regime of initial speed, medium speed, medium-high speed and high speed, and the centrifugation time is 30 to 50 minutes.

[0017] Furthermore, in step S5, after centrifugation in a centrifuge, steam curing is performed, followed by demolding and trimming to obtain a prefabricated solid round pile.

[0018] Further, in step S5, the steam curing process is as follows: the centrifuged pile with mold after centrifugation is hoisted into the atmospheric pressure steam curing tank, left to stand for 1-2 hours, and slowly heated to 100-110℃, and cured at atmospheric pressure for 3-4 hours; then the centrifuged square pile after demolding is put into the high pressure autoclave for high temperature steam curing at a temperature of 170-180℃, a saturated steam pressure of 1.5 MPa, and a curing time of 8-10 hours.

[0019] Another object of the present invention is to provide a prestressed centrifugal solid circular pile, which is prepared using the above-described preparation process.

[0020] Specifically, the concrete comprises the following components by weight: 320-390 parts silicate cement, 410-490 parts coarse sand, 150-280 parts medium-coarse sand, 1000-1200 parts crushed stone, 130-180 parts water, 20-30 parts steel slag, 30-50 parts siliceous iron tailings powder, 20-25 parts gypsum, 15-22 parts high-calcium ash, 25-45 parts silica fume, 1.3-1.9 parts polycarboxylate superplasticizer, 1-1.2 parts sodium molybdate, 5-10 parts styrene-butadiene latex, 0.5-1 part stannous chloride, 20-30 parts natural zeolite ultrafine powder, 1-1.5 parts air-entraining agent, and 220-400 parts ultrafine fly ash.

[0021] The advantages of this invention, which describes a prestressed centrifugal solid circular pile and its manufacturing process, compared with existing technologies are as follows:

[0022] (1) The prestressed centrifugal solid round pile prepared by the above preparation process has a volume much smaller than that of the same type of solid square pile, greatly reduces the amount of raw materials, and achieves energy saving and emission reduction in the preparation process.

[0023] (2) The solid round piles prepared have better shear and bending resistance than solid square piles. The penetration force of solid round piles is greater than that of solid square piles. They are more widely applicable in complex soil conditions. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments.

[0025] Example 1.

[0026] The manufacturing process of a prestressed centrifugal solid circular pile according to this embodiment includes the following steps:

[0027] S1. Design a mold for solid circular piles according to the actual requirements of the pile foundation on site. The cavity of the mold is circular, and an isolation layer is applied before pouring.

[0028] S2. Process the required pile reinforcement cage according to the dimensions of the precast square pile to be prepared, and assemble it into an integral skeleton;

[0029] S3. Design the theoretical mix proportion of concrete, conduct experiments and adjustments to determine the actual mix proportion, and prepare concrete according to the actual mix proportion;

[0030] S4. Install the overall frame into the mold, perform prestressing tensioning using a tensioning machine, and then anchor it;

[0031] S5. Pour the concrete according to the actual mix proportion to obtain a solid round pile.

[0032] In step S3, the concrete comprises the following components by weight: 320 parts silicate cement, 490 parts coarse sand, 280 parts medium-coarse sand, 200 parts crushed stone, 130 parts water, 20 parts steel slag, 30 parts siliceous iron tailings powder, 20 parts gypsum, 15 parts high-calcium ash, 25 parts silica fume, 1.3 parts polycarboxylate superplasticizer, 1 part sodium molybdate, 5 parts styrene-butadiene latex, 0.5 parts stannous chloride, 20 parts natural zeolite ultrafine powder, 1 part air-entraining agent, and 220 parts ultrafine fly ash.

[0033] Example 2

[0034] A manufacturing process for a prestressed centrifugal solid circular pile includes the following steps:

[0035] S1. Design a mold for solid circular piles according to the actual requirements of the pile foundation on site. The cavity of the mold is circular, and an isolation layer is applied before pouring.

[0036] S2. Process the required pile reinforcement cage according to the dimensions of the precast square pile to be prepared, and assemble it into an integral skeleton;

[0037] S3. Design the theoretical mix proportion of concrete, conduct experiments and adjustments to determine the actual mix proportion, and prepare concrete according to the actual mix proportion;

[0038] S4. Install the overall frame into the mold, perform prestressing tensioning using a tensioning machine, and then anchor it;

[0039] S5. Pour the concrete according to the actual mix proportion to obtain a solid round pile.

[0040] In step S1, the inner edges of the cavity of the solid round pile mold are all rounded.

[0041] In step S3, the concrete comprises the following components by weight: 340 parts silicate cement, 450 parts coarse sand, 200 parts medium-coarse sand, 1100 parts crushed stone, 145 parts water, 22 parts steel slag, 35 parts siliceous iron tailings powder, 20 parts gypsum, 16 parts high-calcium ash, 30 parts silica fume, 1.5 parts polycarboxylate superplasticizer, 1 part sodium molybdate, 6 parts styrene-butadiene latex, 0.6 parts stannous chloride, 25 parts natural zeolite ultrafine powder, 1.1 parts air-entraining agent, and 300 parts ultrafine fly ash.

[0042] In step S5, a screw extrusion feeding method is used to make the concrete reach a density of 99%.

[0043] In step S5, after pouring the concrete with the actual mix proportions, the concrete is centrifuged to shape the air bubbles on the outer wall of the solid round pile.

[0044] Example 3

[0045] A manufacturing process for a prestressed centrifugal solid circular pile includes the following steps:

[0046] S1. Design a mold for solid circular piles according to the actual requirements of the pile foundation on site. The cavity of the mold is circular, and an isolation layer is applied before pouring.

[0047] S2. Process the required pile reinforcement cage according to the dimensions of the precast square pile to be prepared, and assemble it into an integral skeleton;

[0048] S3. Design the theoretical mix proportion of concrete, conduct experiments and adjustments to determine the actual mix proportion, and prepare concrete according to the actual mix proportion;

[0049] S4. Install the overall frame into the mold, perform prestressing tensioning using a tensioning machine, and then anchor it;

[0050] S5. Pour the concrete according to the actual mix proportion to obtain a solid round pile.

[0051] In step S1, the inner edges of the cavity of the solid round pile mold are all rounded.

[0052] In step S3, the concrete comprises the following components by weight: 380 parts silicate cement, 465 parts coarse sand, 260 parts medium-coarse sand, 1100 parts crushed stone, 160 parts water, 25 parts steel slag, 40 parts siliceous iron tailings powder, 25 parts gypsum, 22 parts high-calcium ash, 40 parts silica fume, 1.6 parts polycarboxylate superplasticizer, 1.1 parts sodium molybdate, 8 parts styrene-butadiene latex, 1 part stannous chloride, 30 parts natural zeolite ultrafine powder, 1.5 parts air-entraining agent, and 350 parts ultrafine fly ash.

[0053] In step S5, a screw extrusion feeding method is used to make the concrete reach a density of 99%.

[0054] Furthermore, in this embodiment, in step S5, after pouring the concrete with the actual mix proportions, the concrete is centrifuged to shape the air bubbles on the outer wall of the solid circular pile.

[0055] In this embodiment, the centrifugation process is as follows: the tensioned and anchored centrifugal pile with mold is hoisted above the centrifuge and accelerated step by step according to the centrifugation regime of initial speed, medium speed, medium-high speed and high speed, and the centrifugation time is 30 to 50 minutes.

[0056] Example 4

[0057] A manufacturing process for a prestressed centrifugal solid circular pile includes the following steps:

[0058] S1. Design a mold for solid circular piles according to the actual requirements of the pile foundation on site. The cavity of the mold is circular, and an isolation layer is applied before pouring.

[0059] S2. Process the required pile reinforcement cage according to the dimensions of the precast square pile to be prepared, and assemble it into an integral skeleton;

[0060] S3. Design the theoretical mix proportion of concrete, conduct experiments and adjustments to determine the actual mix proportion, and prepare concrete according to the actual mix proportion;

[0061] S4. Install the overall frame into the mold, perform prestressing tensioning using a tensioning machine, and then anchor it;

[0062] S5. Pour the concrete according to the actual mix proportion to obtain a solid round pile.

[0063] Preferably, in step S1, the inner edges of the cavity of the mold for the solid round pile are all rounded.

[0064] In step S3, the concrete comprises the following components by weight: 390 parts silicate cement, 410 parts coarse sand, 280 parts medium-coarse sand, 1000 parts crushed stone, 180 parts water, 20 parts steel slag, 50 parts siliceous iron tailings powder, 20 parts gypsum, 15 parts high-calcium ash, 25 parts silica fume, 1.9 parts polycarboxylate superplasticizer, 1.2 parts sodium molybdate, 10 parts styrene-butadiene latex, 1 part stannous chloride, 20 parts natural zeolite ultrafine powder, 1.5 parts air-entraining agent, and 400 parts ultrafine fly ash.

[0065] In this embodiment, in step S5, a screw extrusion feed is used to make the concrete reach a density of 99%.

[0066] Furthermore, in step S5, after pouring the concrete with the actual mix proportions, the concrete is centrifuged to shape the air bubbles on the outer wall of the solid circular pile.

[0067] The centrifugation process is as follows: the tensioned and anchored centrifugal pile with formwork is hoisted above the centrifuge and accelerated step by step according to the centrifugation regime of initial speed, medium speed, medium-high speed and high speed, and the centrifugation time is 30 to 50 minutes.

[0068] In this embodiment, in step S5, after centrifugation in a centrifuge, steam curing is performed, followed by demolding and trimming to obtain a prefabricated solid round pile.

[0069] Specifically, in this embodiment, in step S5, the steam curing process is as follows: the centrifuged pile with mold after centrifugation is hoisted into the atmospheric pressure steam curing tank, left to stand for 1 hour, slowly heated to 100°C, and cured at atmospheric pressure for 4 hours; then the centrifuged square pile after demolding is put into the high pressure autoclave for high temperature steam curing at a temperature of 170°C, a saturated steam pressure of 1.5 MPa, and a curing time of 9 hours.

[0070] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A manufacturing process for prestressed centrifugal solid circular piles, characterized in that, It includes the following steps. S1. Design a mold for solid circular piles according to the actual requirements of the pile foundation on site. The cavity of the mold is circular, and an isolation layer is applied before pouring. S2. Process the required pile reinforcement cage according to the dimensions of the precast square pile to be prepared, and assemble it into an integral skeleton; S3. Design the theoretical mix proportion of concrete, conduct experiments and adjustments to determine the actual mix proportion, and prepare concrete according to the actual mix proportion; S4. Install the overall frame into the mold, perform prestressing tensioning using a tensioning machine, and then anchor it; S5. Pour the concrete according to the actual mix proportion to obtain a solid round pile.

2. The manufacturing process of a prestressed centrifugal solid circular pile as described in claim 1, characterized in that, In step S1, the inner edges of the cavity of the solid round pile mold are all rounded.

3. The manufacturing process of a prestressed centrifugal solid circular pile as described in claim 1, characterized in that, In step S3, the concrete comprises the following components by weight: 320-390 parts silicate cement, 410-490 parts coarse sand, 150-280 parts medium-coarse sand, 1000-1200 parts crushed stone, 130-180 parts water, 20-30 parts steel slag, 30-50 parts siliceous iron tailings powder, 20-25 parts gypsum, 15-22 parts high-calcium ash, 25-45 parts silica fume, 1.3-1.9 parts polycarboxylate superplasticizer, 1-1.2 parts sodium molybdate, 5-10 parts styrene-butadiene latex, 0.5-1 part stannous chloride, 20-30 parts natural zeolite ultrafine powder, 1-1.5 parts air-entraining agent, and 220-400 parts ultrafine fly ash.

4. The manufacturing process of a prestressed centrifugal solid circular pile as described in any one of claims 1 to 3, characterized in that, In step S5, a screw extrusion feed is used to make the concrete reach a density of 99%.

5. The manufacturing process of a prestressed centrifugal solid circular pile as described in claim 1, characterized in that, In step S5, after pouring the concrete with the actual mix proportions, the concrete is centrifuged to shape the air bubbles on the outer wall of the solid round pile.

6. The manufacturing process of a prestressed centrifugal solid circular pile as described in claim 5, characterized in that, The centrifugation process is as follows: The tensioned and anchored centrifugal pile with formwork is hoisted above the centrifuge and accelerated step by step according to the centrifugation regime of initial speed, medium speed, medium-high speed and high speed, and the centrifugation time is 30 to 50 minutes.

7. The manufacturing process of a prestressed centrifugal solid circular pile as described in claim 6, characterized in that, In step S5, after centrifugation in a centrifuge, the material is steam cured, then demolded and trimmed to obtain a precast solid round pile.

8. The manufacturing process of a prestressed centrifugal solid circular pile as described in claim 6, characterized in that, In step S5, the steam curing process is as follows: the centrifuged pile with mold after centrifugation is hoisted into the atmospheric pressure steam curing tank, left to stand for 1-2 hours, and then slowly heated to 100-110℃ and cured at atmospheric pressure for 3-4 hours; then the centrifuged square pile after demolding is put into the high pressure autoclave for high temperature steam curing at a temperature of 170-180℃, a saturated steam pressure of 1.5 MPa, and a curing time of 8-10 hours.

9. A prestressed centrifugal solid circular pile, characterized in that, It is prepared using the preparation process described in any one of claims 1 to 8.

10. The prestressed centrifugal solid circular pile as described in claim 9, characterized in that, The concrete comprises the following components by weight: 320-390 parts silicate cement, 410-490 parts coarse sand, 150-280 parts medium-coarse sand, 1000-1200 parts crushed stone, 130-180 parts water, 20-30 parts steel slag, 30-50 parts siliceous iron tailings powder, 20-25 parts gypsum, 15-22 parts high-calcium ash, 25-45 parts silica fume, 1.3-1.9 parts polycarboxylate superplasticizer, 1-1.2 parts sodium molybdate, 5-10 parts styrene-butadiene latex, 0.5-1 part stannous chloride, 20-30 parts natural zeolite ultrafine powder, 1-1.5 parts air-entraining agent, and 220-400 parts ultrafine fly ash.