CN111636419A - Construction equipment and construction method for grouting thin-wall tubular pile - Google Patents
Construction equipment and construction method for grouting thin-wall tubular pile Download PDFInfo
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- CN111636419A CN111636419A CN202010624848.7A CN202010624848A CN111636419A CN 111636419 A CN111636419 A CN 111636419A CN 202010624848 A CN202010624848 A CN 202010624848A CN 111636419 A CN111636419 A CN 111636419A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D11/00—Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0007—Production methods using a mold
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses construction equipment and a construction method for grouting and forming a thin-wall tubular pile, wherein the construction equipment comprises a cylinder, two grouting pipes are symmetrically arranged on the inner wall of the cylinder, and the grouting pipes are arranged along the axis of the cylinder; the inner wall of the bottom of the cylinder is fixedly provided with an annular pipe, the sections of the lower part and the upper part of the annular pipe are wedge-shaped, so that pile sinking and pile pulling are facilitated; the outer wall of the annular pipe is a cylindrical surface, is coaxial with the cylinder and has the same outer diameter as the inner diameter of the cylinder; the top of the annular pipe is provided with two slurry inlets which are respectively connected with the lower ends of the two grouting pipes; a plurality of circular holes are formed in the wedge-shaped inclined plane at the lower part of the annular pipe and used as pulp outlets, and the pulp inlets are communicated with the pulp outlets through the annular pipe. The invention has the advantages of simple structure, convenient manufacture, low cost, quick construction and easy guarantee of construction quality.
Description
Technical Field
The invention belongs to the technical field of civil engineering construction, and particularly relates to construction equipment and a construction method for grouting thin-wall tubular piles.
Background
The pile foundation refers to a deep foundation consisting of piles and pile caps connecting the tops of the piles, and the function of the pile foundation is to transmit the load of an upper structure to the deep foundation. It is divided into precast pile and cast-in-place pile according to construction method. The precast pile is made of various materials and various forms of piles (such as a wooden pile, a concrete square pile, a prestressed concrete tubular pile, a steel pile and the like) in a factory or a construction site, and is driven, pressed or vibrated into the soil by using pile sinking equipment. The cast-in-situ bored concrete pile is formed through forming hole in the foundation, setting steel bar cage or no steel bar inside the hole and pouring concrete into the hole.
The construction of the cast-in-place pile below the underground water level requires the adoption of slurry retaining walls to prevent the collapse of the hole wall during hole digging. For soft soil foundations, such as silt and mucky soil layers, particularly when the thickness is large, even if a mud wall protection technology is adopted, serious hole wall collapse can still occur, so that the phenomena of disconnection, necking and the like of the cast-in-place pile are caused, and the pile forming quality of the cast-in-place pile is influenced. In order to solve the problem, a common method at present is to press a steel casing into a pile position in advance. However, the method is difficult to adapt to soft soil layers with large burial depth, and when the steel casing is too long, such as more than 15m, the steel casing is difficult to pull out.
Before the invention, a large-diameter sleeve molding cast-in-place pipe pile machine (patent number: ZL 01273182-X) for soft foundation treatment and a large-diameter cast-in-place pipe pile composite foundation construction method (patent number: ZL 02112538-4) for soft foundation treatment are invented, wherein a steel inner and outer double-layer sleeve cavity structure is sunk into a foundation at a designed depth under the protection of closing of a valve pile shoe in a vibration mode, concrete is uniformly injected into the structure through a concrete flow divider, then the cavity structure is vibrated and pulled out, the valve pile shoe is automatically separated when the cavity structure is pulled out, and the concrete is injected into an annular groove formed after the cavity structure is pulled out, so that the cast-in-place concrete thin-wall pipe pile is formed. Although the technology is widely applied to expressways and high-speed railways at present, construction equipment is complex, pile sinking is difficult when soil is hard, and measures such as drilling and soil taking need to be taken.
Disclosure of Invention
In order to solve the technical problems, the invention provides the construction equipment and the construction method for the grouting forming thin-wall tubular pile, which have the advantages of simple structure, convenience in operation, capability of improving the pile forming speed and quality and reduction in production cost.
The technical scheme adopted by the invention is as follows: the utility model provides a construction equipment of slip casting thin wall tubular pile, characterized by: the device comprises a cylinder, wherein two grouting pipes are symmetrically arranged on the inner wall of the cylinder and arranged along the axis of the cylinder; the inner wall of the bottom of the cylinder is fixedly provided with an annular pipe, the sections of the lower part and the upper part of the annular pipe are wedge-shaped, so that pile sinking and pile pulling are facilitated; the outer wall of the annular pipe is a cylindrical surface, is coaxial with the cylinder and has the same outer diameter as the inner diameter of the cylinder; the top of the annular pipe is provided with two slurry inlets which are respectively connected with the lower ends of the two grouting pipes; a plurality of circular holes are arranged on the wedge-shaped inclined plane at the lower part of the annular pipe and are used as slurry outlets.
In the construction equipment for forming the thin-wall tubular pile by grouting, the section of the annular pipe is an isosceles triangle, and the bottom edge of the isosceles triangle is the outer wall of the annular pipe; the pulp outlet is arranged on the lower waist of the isosceles triangle.
In the construction equipment for grouting and forming the thin-wall tubular pile, the diameter of the cylinder is 0.8-2.0 m, the length of the cylinder is 5.0-30.0 m, and the cylinder is made of steel; the distance between the adjacent slurry outlets is 100-200 mm; the diameter of the pulp outlet is 5-8 mm; the height of the bottom edge of the isosceles triangle of the section of the annular pipe is 5.0-15.0 cm.
In the construction equipment for forming the thin-wall tubular pile by grouting, the top of the cylinder is provided with the cover plate.
A construction method for forming a thin-wall tubular pile by grouting through the construction equipment comprises the following steps:
1) firstly, determining grouting amount, grouting pressure and tube drawing speed through a test pile; then determining the pile position, and enabling the pile machine and construction equipment for grouting forming the thin-wall tubular pile to be in place;
2) sinking a cylinder and pre-grouting: starting a vibrating hammer of the pile machine, vibrating and sinking into the cylinder to a designed depth, then starting grouting to a grouting hose, taking the self-weight stress of a soil body at the pile end by grouting pressure, and simultaneously injecting cement slurry into two grouting hoses after slurry flows out of the other grouting hose; grouting pressure is 3-5 times of the self-weight stress of the soil body at the pile end, keeping for 3-5 minutes, and allowing cement slurry to diffuse to the soil adjacent to the cylinder end through high-pressure permeation or cleavage grouting to form an expanded head reinforcing body;
3) vibrating and drawing the cylinder: adopting a pile machine to vibrate and pull out the cylinder, grouting according to the designed grouting pressure while pulling out the cylinder, and keeping the grouting pressure and the speed of pulling out the cylinder unchanged;
4) moving the machine: moving the next pile position of the machine to pile the root pile, and repeating the steps 2) -3) until all the piles are piled; injecting clear water into the grouting pipe, and washing the construction equipment for grouting and forming the thin-wall pipe pile;
5) treating the pile head: pile head floating slurry and the soil burial depth of 0.5m in the pipe wall are chiseled off and filled with cement mortar.
6. The construction method of grouting-forming thin-walled tubular piles according to claim 5, wherein in the step 3), if reinforcement is required, the slurry is vibrated to sink into a reinforcement cage or a geogrid cage before initial setting to form the reinforced cement-sand concrete tubular pile.
In the construction method for forming the thin-wall tubular pile by grouting, in the step 3), when the grouting phenomenon appears on the surface of the pile position in the process of pulling out the cylinder, the speed of pulling out the cylinder and the grouting pressure are gradually reduced until the cylinder pulling is finished.
In the construction method for grouting and forming the thin-wall tubular pile, the cement slurry adopts pure cement slurry, cement-water glass double-liquid slurry, cement mortar or fiber cement mortar; the sand in the mortar adopts medium-fine sand, and the cement adopts ordinary portland cement with the label of P.O 42.5.5.
Compared with the prior art, the invention has the beneficial effects that:
1. the construction equipment for grouting and forming the thin-wall tubular pile has the advantages of simple structure, convenience in manufacturing, quickness in construction and cost degree; the thickness of the pipe wall of the pipe pile can be flexibly controlled by the thickness of the slurry outlet pipe of the annular pipe at the bottom end of the cylinder.
2. The invention adopts the form of pile pulling and grouting at the same time to form the pile, the hole left by pile pulling can be quickly filled by grouting liquid in excess under the grouting pressure which is several times higher than the self-weight stress of the hole, the pile body quality problems such as necking of the section pile and the like can not be generated, and the product quality is ensured.
3. The slurry outlet of the construction equipment for grouting and forming the thin-wall tubular pile is arranged on the lower waist of the isosceles triangle of the section of the annular pipe, so that the grouting surface is of an inward-inclined structure, the disturbance on soil outside the pipe wall in the piling process is small, the soil squeezing effect is small, and the influence on the surrounding environment can be ignored; high-pressure pre-grouting is carried out before pipe drawing, and soil bodies near the pile end are reinforced, so that the bearing capacity of the soil at the pile end is improved; and the soil body in the pipe wall is compressed and grouted in the piling process, so that the strength is greatly improved, the quality of the pipe pile is ensured, and the bearing capacity of the pipe pile is improved.
4. The loose soil buried 0.5m deep in the pipe wall of the pile head of the pipe pile produced by the invention is replaced by cement mortar, the soil body in the pipe wall is in a closed state, pore water can not be discharged, and the saturated soft soil layer is basically in an incompressible state, so the bearing capacity of the pipe pile produced by the invention is not greatly different from that of a solid pile under the condition of enough strength of the pile body, the material is saved, and the cost is greatly reduced.
5. According to the construction method for forming the thin-wall tubular pile by grouting, provided by the invention, if the grouting pressure and the speed of lifting the cylinder are kept unchanged in the tube drawing process, and the dead weight stress is reduced, the grouting amount of the shallow stratum per unit length is slightly larger than that of the deep stratum, the strength of the upper part of the pile body is also enhanced, and the construction method is matched with the axial force distribution condition of the stress of the pile body, so that the bearing capacity of the tubular pile is improved.
Drawings
Fig. 1 is a structural view of the construction equipment for forming a thin-walled tubular pile by grouting according to the present invention.
Fig. 2 is a top view of the construction equipment for grouting thin-wall pipe piles according to the present invention.
Fig. 3 is a bottom view of the construction equipment for grouting and forming the thin-wall pipe pile of the present invention.
Fig. 4 is a structural view of the construction equipment for casting a thin-walled tubular pile according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1-3, the construction equipment for grouting and forming the thin-wall tubular pile comprises a cylinder 4 and two grouting pipes 3, wherein the diameter of the cylinder 4 is 0.8-2.0 m, the length of the cylinder 4 is 5.0-30.0 m, the cylinder 4 is made of steel, and the top of the cylinder is provided with a cover plate 2. The vibration hammer 1 of the pile machine transmits the exciting force to the round steel cylinder 4 through the cover plate 2 to enable the round steel cylinder to sink.
Two grouting pipes 3 are symmetrically welded on the inner wall of the cylinder 4, and the grouting pipes 3 are arranged along the axis of the cylinder. The inner wall of the bottom of the cylinder 4 is welded with an annular pipe 5, the section of the annular pipe 5 is an isosceles triangle, the outer wall of the annular pipe is a cylindrical surface, and the bottom edge of the isosceles triangle is a cylindrical surface. The outer diameter of the annular tube is the same as the inner diameter of the cylinder 4 and the annular tube 5 is coaxial with the cylinder 4. The section of the annular pipe 5 is composed of an upper wedge-shaped structure and a lower wedge-shaped structure, so that pile sinking and pile pulling are facilitated. The top of the annular pipe 5 is provided with two slurry inlets which are respectively connected with the lower ends of the two grouting pipes 3; the lower waist of the isosceles triangle of the section of the annular pipe 5 is provided with a plurality of slurry outlets in the shape of circular holes, and the slurry outlets and the slurry inlets are communicated with each other through the annular pipe 5. The distance between the slurry outlets of the adjacent circular holes is 100 mm and 200 mm; the diameter of the pulp outlet of the circular hole is 5-8 mm. The height of the bottom side of the isosceles triangle of the section of the annular tube 5 is 5.0-15.0 cm (namely the maximum size in the horizontal direction).
The construction method of the grouting forming thin-wall tubular pile of the construction equipment for grouting forming thin-wall tubular pile comprises the following steps:
1) preparation work: a: and determining grouting amount, grouting pressure and pile pulling speed through pile testing. B: determining the pile position, the pile driver and the construction equipment for forming the thin-wall tubular pile by grouting in place. C: when cement mortar is used as a grouting material, river sand is sieved by a vibrating screen, and medium and fine sand with the particle size of 0.5-0.125 mm is left for mixing the cement mortar.
2) Sinking a cylinder and pre-grouting: the pile driver is started, the vibration hammer of the pile driver drives the cylinder 4 to sink the pile to the designed depth, then cement paste is injected into the grouting pipe 3, and the grouting pressure is used for taking the self-weight stress of the soil body at the pile end. When the air in the pipes is completely discharged, namely after the other grouting pipe 3 starts to discharge grout, grouting is simultaneously carried out on the two grouting pipes 3. Firstly, a higher grouting pressure (3-5 times of the self-weight stress of the soil body at the pile end) is kept for 3-5 minutes, so that the grout can flush the soil extruded in the process of sinking the pile from a grout outlet, and the grout can be diffused to the soil adjacent to the pile end in a high-pressure permeation or splitting grouting mode to form the enlarged head reinforcing body.
3) And (3) vibrating and drawing the cylinder 4: and (3) pulling the cylinder 4 while vibrating, grouting according to the designed grouting pressure while pulling the cylinder 4, and keeping the grouting pressure and the tube pulling speed basically unchanged. And when the pile position surface shows the grout turnover sign, reducing the speed of pulling the cylinder and the grouting pressure until the pulling of the cylinder is completed smoothly. If reinforcement is needed, the slurry is vibrated to sink into a reinforcement cage or a geogrid cage before initial setting to form the reinforced cement-sand concrete pipe pile.
4) Moving the machine: moving the next pile position of the machine to beat a root pile, repeating the steps 2) -3) until all the piles are beaten, injecting clear water into the grouting pipe, and flushing the construction equipment for grouting and forming the thin-wall pipe pile;
5) treating the pile head: pile head floating slurry and the soil burial depth of 0.5m in the pipe wall are chiseled off and filled with cement mortar.
The cement slurry adopts pure cement slurry, cement-water glass double-liquid slurry, cement mortar or fiber cement mortar; the sand in the mortar adopts medium-fine sand, and the cement adopts ordinary portland cement with the label of P.O 42.5.5.
When the pile is used for the construction of a reinforced concrete cast-in-place pile of a deep and soft soil layer, the pile driving method can be used for driving the tubular pile on the outer ring layer of the pile position of the cast-in-place pile to reinforce the hole wall of the cast-in-place pile, then mechanical or manual soil excavation is carried out in the tubular pile, after soil in the tubular pile is removed, a reinforcement cage is placed in the tubular pile and concrete is poured, mud is not needed for protecting the wall, the pile is environment-friendly and safe, the bearing capacity of a single pile is greatly improved, the pile driving method is equivalent to post-grouting treatment of the cast-in-place pile.
Claims (8)
1. The utility model provides a construction equipment of slip casting thin wall tubular pile, characterized by: the device comprises a cylinder, wherein two grouting pipes are symmetrically arranged on the inner wall of the cylinder and arranged along the axis of the cylinder; the inner wall of the bottom of the cylinder is fixedly provided with an annular pipe, the sections of the lower part and the upper part of the annular pipe are wedge-shaped, so that pile sinking and pile pulling are facilitated; the outer wall of the annular pipe is a cylindrical surface, is coaxial with the cylinder and has the same outer diameter as the inner diameter of the cylinder; the top of the annular pipe is provided with two slurry inlets which are respectively connected with the lower ends of the two grouting pipes; a plurality of circular holes are arranged on the wedge-shaped inclined plane at the lower part of the annular pipe and are used as slurry outlets.
2. The construction equipment for grouting and forming the thin-wall tubular pile according to claim 1, which is characterized in that: the section of the annular pipe is an isosceles triangle, and the bottom edge of the isosceles triangle is the outer wall of the annular pipe; the pulp outlet is arranged on the lower waist of the isosceles triangle.
3. The construction equipment for grouting and forming the thin-wall tubular pile according to claim 1, which is characterized in that: the diameter of the cylinder is 0.8-2.0 m, the length of the cylinder is 5.0-30.0 m, and the cylinder is made of steel; the distance between the adjacent slurry outlets is 100-200 mm; the diameter of the pulp outlet is 5-8 mm; the height of the bottom edge of the isosceles triangle of the section of the annular pipe is 5.0-15.0 cm.
4. The construction equipment for grouting and forming the thin-wall tubular pile according to claim 1, which is characterized in that: the top of the cylinder is provided with a cover plate.
5. A construction method for grouting a thin-wall pipe pile by using the construction equipment as claimed in any one of claims 1 to 4, comprising the following steps:
1) firstly, determining grouting amount, grouting pressure and tube drawing speed through a test pile; then determining the pile position, and enabling the pile machine and construction equipment for grouting forming the thin-wall tubular pile to be in place;
2) sinking a cylinder and pre-grouting: starting a vibrating hammer of the pile machine, vibrating and sinking into the cylinder to a designed depth, then starting grouting to a grouting hose, taking the self-weight stress of a soil body at the pile end by grouting pressure, and simultaneously injecting cement slurry into two grouting hoses after slurry flows out of the other grouting hose; grouting pressure is 3-5 times of the self-weight stress of the soil body at the pile end, keeping for 3-5 minutes, and allowing cement slurry to diffuse to the soil adjacent to the cylinder end through high-pressure permeation or cleavage grouting to form an expanded head reinforcing body;
3) vibrating and drawing the cylinder: adopting a pile machine to vibrate and pull out the cylinder, grouting according to the designed grouting pressure while pulling out the cylinder, and keeping the grouting pressure and the speed of pulling out the cylinder unchanged;
4) moving the machine: moving the next pile position of the machine to pile the root pile, and repeating the steps 2) -3) until all the piles are piled; injecting clear water into the grouting pipe, and washing the construction equipment for grouting and forming the thin-wall pipe pile;
5) treating the pile head: pile head floating slurry and the soil burial depth of 0.5m in the pipe wall are chiseled off and filled with cement mortar.
6. The construction method of grouting-forming thin-walled tubular piles according to claim 5, wherein in the step 3), if reinforcement is required, the slurry is vibrated to sink into a reinforcement cage or a geogrid cage before initial setting to form the reinforced cement-sand concrete tubular pile.
7. The construction method of grouting-forming the thin-wall tubular pile according to claim 5, wherein in the step 3), when the pile position surface shows the sign of grout turnover in the process of pulling out the cylinder, the speed of pulling out the cylinder and the grouting pressure are gradually reduced until the pulling out of the cylinder is completed.
8. The construction method of grouting-formed thin-walled tubular pile according to claim 5, wherein the cement slurry is pure cement slurry, cement-water glass double-liquid slurry, cement mortar or fiber cement mortar; the sand in the mortar adopts medium-fine sand, and the cement adopts ordinary portland cement with the label of P.O 42.5.5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010624848.7A CN111636419A (en) | 2020-07-02 | 2020-07-02 | Construction equipment and construction method for grouting thin-wall tubular pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010624848.7A CN111636419A (en) | 2020-07-02 | 2020-07-02 | Construction equipment and construction method for grouting thin-wall tubular pile |
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| CN111636419A true CN111636419A (en) | 2020-09-08 |
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| CN202010624848.7A Pending CN111636419A (en) | 2020-07-02 | 2020-07-02 | Construction equipment and construction method for grouting thin-wall tubular pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112144517A (en) * | 2020-10-16 | 2020-12-29 | 中铁十五局集团第五工程有限公司 | Method for grouting retaining wall by using steel retaining cylinder for pile foundation in weak stratum |
-
2020
- 2020-07-02 CN CN202010624848.7A patent/CN111636419A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112144517A (en) * | 2020-10-16 | 2020-12-29 | 中铁十五局集团第五工程有限公司 | Method for grouting retaining wall by using steel retaining cylinder for pile foundation in weak stratum |
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