CN111827280A - Ex-situ pouring, jacking and in-place hole digging pile retaining wall device and construction method thereof - Google Patents
Ex-situ pouring, jacking and in-place hole digging pile retaining wall device and construction method thereof Download PDFInfo
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- CN111827280A CN111827280A CN202010730468.1A CN202010730468A CN111827280A CN 111827280 A CN111827280 A CN 111827280A CN 202010730468 A CN202010730468 A CN 202010730468A CN 111827280 A CN111827280 A CN 111827280A
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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
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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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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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A wall protecting device for an ex-situ pouring and jacking hole digging pile and a construction method thereof are disclosed. The template is a cylindrical structure with an outer bottom edge formed by splicing a plurality of arc steel templates with bottoms; the bottom-equipped arc-shaped steel template (10) consists of an arc-shaped side template (1) and a bottom template (2) which are connected by adopting a U-shaped card; the bottom template is a sector; one end of the arc-shaped side template is vertically welded on the end surface of the small arc of the sector bottom template; a cylinder is formed by a plurality of arc-shaped side templates, and an annular surface is formed by a plurality of bottom templates; the annular surface is closely connected with the lower end of the arc-shaped side template, and the annular surface of the bottom template is used for placing a reinforcement cage. The construction method adopts a method of heterotopic pouring, jacking and in-place, the invention adopts a cylindrical template structure with outer bottom edges formed by splicing arc-shaped steel templates with bottoms, and simultaneously adopts a retaining wall construction method of heterotopic pouring and jacking and in-place, thereby avoiding slab staggering, enabling the old and new retaining walls to be better connected and ensuring the quality of the retaining wall.
Description
Technical Field
The invention relates to a wall protecting device for an ex-situ pouring jacking in-place bored pile and a construction method thereof, and belongs to the technical field of civil bored piles.
Background
The hole digging pile is characterized in that firstly, manual soil digging is carried out to form a pile hole, the wall of the pile hole is lined to ensure construction safety while downward tunneling is carried out, and concrete is poured after the bottom of the pile hole is cleaned. The manual hole digging pile is generally thicker in diameter, the thinnest is more than 800 mm, and the manual hole digging pile is generally applied to the aspects of bridges, subways, civil buildings, retaining wall foundations and the like. The pile is provided with bearing platforms, and the bearing platform beams are used for drawing and connecting the piles, so that the stress of each pile is uniformly distributed to support the whole building.
The manual hole digging pile is convenient to construct, high in speed and free of large-scale mechanical equipment, the hole digging pile is stronger in shock resistance than a timber pile and a concrete driven pile, and the manufacturing cost is saved compared with that of a punching cone, a punching drill, a drilling hole of a rotary drill and a well sinking foundation.
However, the underground operation condition of the hole digging pile is poor, the environment is severe, the labor intensity is high, and particularly the support of the hole wall is difficult.
The retaining wall can be formed in various modes, such as wood boards, brick masonry, steel ring beams, sprayed concrete, sleeve type metal shells, open caisson and the like. However, because the manual hole digging pile belongs to manual operation, the progress is slow, the equipment is simple, the mechanization degree is low, the field application is most or the concrete cast-in-place is adopted, the mode has strong flexibility, the mode is matched with the field operation condition, the integrity and the seepage-proofing performance of the protecting wall are better, the structural form is flexible and changeable, and the expanding bottom can be made.
The construction of the concrete retaining wall is the key of the hole forming of the manual dug pile, and the traditional cast-in-place construction method has the following problems: (1) the existence of steps: because the concrete retaining wall is constructed layer by layer from top to bottom along with the excavation sequence of the bored pile, when the next layer of retaining wall is constructed, the front layer of retaining wall is already finished, after the formwork of the layer is erected, the concrete cannot be poured, the formwork can only be inclined towards the inside of the hole, so that the concrete can be poured and vibrated, and after the concrete is solidified and the formwork is removed, a step is formed (as shown in fig. 7). (2) And (3) limiting application: because the retaining wall is stepped, the concrete can be covered after the pile foundation of the hole digging pile is poured, and if the pile foundation of the hole digging pile is of a vertical shaft structure or the like, the influence of the stepped retaining wall on the appearance is large, so that the application range of the hole digging pile is limited. (3) The cost is increased: because the step type of the retaining wall needs to increase the thickness of the retaining wall, the outer size of the excavated hole needs to be increased, and the engineering cost is naturally increased. (4) Increasing the risk: because the external size of the dug pile is increased, the number of projects is increased, the progress is slowed down, and the construction risk is naturally increased.
Disclosure of Invention
The invention aims to provide a construction method for casting and lifting in-place dug pile retaining walls in different positions, which aims to solve the problems that the concrete surface of the retaining wall is smooth and has no staggered platform, the assembly of retaining wall templates is convenient and can be used repeatedly, the construction method is simple and easy to implement, and the construction time is not limited.
The technical scheme includes that the wall protecting device for the ex-situ pouring and jacking in-place dug pile comprises a jack and a template.
The template is a cylindrical structure with an outer bottom edge formed by splicing a plurality of arc steel templates with bottoms; the bottom-equipped arc-shaped steel template consists of an arc-shaped side template and a bottom template, the bottom template is a sector, and the radius of a small arc of the bottom template of the sector is the same as the arc radius of the cross section of the arc-shaped template; one end of the arc-shaped side template is vertically welded on the end surface of the small arc of the sector bottom template; a cylinder is formed by a plurality of arc-shaped side templates, and an annular surface is formed by a plurality of bottom templates; the annular surface is closely connected with the lower end of the arc-shaped side template, and the annular surface of the bottom template is mainly used as a bottom template for ex-situ casting of retaining wall concrete (containing a reinforcement cage) and is also a main action surface for completing the jacking process.
The arc-shaped side templates can be connected with each other by adopting a U-shaped card; the bottom die plate and the bottom die plate can be connected by a U-shaped card.
The plurality of arc-shaped steel templates with bottoms can be preferably selected to be 2-4 arc-shaped steel templates with bottoms according to the shape and size of the bored pile.
The width of the bottom template is the thickness of the protective wall, and the width needs to be determined by calculation according to field conditions, and is generally 8-15 cm.
The height of the arc-shaped side template is determined according to geological conditions and is generally 50-80 cm; the upper end thereof is slightly bent to the outer (in-hole direction) side so as not to collide with the upper cast concrete retaining wall.
The construction method for casting and jacking in-place hole digging pile retaining walls in different positions comprises the following steps:
(1) pouring concrete at the hole opening to form a first layer of retaining wall support, and continuously digging a hole downwards after the pouring of the concrete retaining wall at the hole opening of the hole digging pile is finished, wherein the depth is determined according to geological conditions and is usually 0.8-1.2 m;
(2) installing jacks at joints of the steel modules, wherein the number of the jacks is determined according to the number of the modules;
(3) a circular steel reinforcement cage with a protective wall is arranged,
(4) a bottom arc-shaped steel template is installed, and the bottom template is installed between the jack and the upper part and the lower part of the reinforcement cage; the arc-shaped side templates are uniformly installed and connected with each other by adopting 2U-shaped clamps; the bottom template is installed and connected with the bottom template through 1U-shaped clamp;
(5) pouring and vibrating the concrete of the protecting wall;
(6) after the retaining wall concrete is dried, a jack pushes the finished retaining wall; when the templates are assembled in an ectopic mode, a gap of 0.2-0.3 m is reserved between the upper portion of the concrete retaining wall of the layer and the concrete retaining wall of the upper layer, the concrete is poured and vibrated, and the retaining wall without a wrong platform is formed after jacking;
(7) curing the newly poured concrete;
(8) digging a hole downwards near the middle part of the digging pile;
(9) after the newly poured breast wall concrete is initially set, the jack is removed, and the mold is loosened and removed;
(10) and (5) continuously digging holes downwards, and repeating the steps (1) to (9) until the hole digging pile is finished.
The invention has the advantages that the invention adopts a cylindrical template structure with an outer bottom edge formed by splicing a plurality of arc-shaped steel templates with bottoms, and simultaneously adopts a retaining wall construction method of ectopic pouring and jacking in place, thereby avoiding slab staggering, enabling the old and new retaining walls to be better connected and ensuring the quality of the retaining walls. The invention solves the difficult problem of the construction of the retaining wall of the dug pile for a long time, greatly improves the efficiency of the retaining wall, enhances the beautiful effect and reduces the construction cost.
With the increasing construction quantity of the on-site hole digging pile foundations, the problem of the hole digging pile retaining wall is solved, and great economic benefits are created for national basic construction.
Drawings
FIG. 1 is a schematic structural view of a dug pile retaining wall device according to the present invention;
FIG. 2 is a construction flow chart of a dado of an ex-situ pouring jacking in-place hole digging pile;
FIG. 3 is a top view of the dug pile retaining wall assembly;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a construction drawing of wall protection ectopic pouring;
FIG. 6 is a schematic illustration of the jacking of the retaining wall into position;
FIG. 7 is a schematic view of a conventional step formed on a retaining wall step of a bored pile;
in the figure, 1 is an arc-shaped side template; 2 is a bottom template; 3 is a U-shaped card; and 10 is a bottom arc steel template.
Detailed Description
The specific embodiment of the present invention is as follows.
An ex-situ pouring and jacking in-place hole digging pile retaining wall device of the embodiment is shown in figures 2-4.
This embodiment a dystopy is pour jacking and is taken one's place hole digging pile dado device, includes steel reinforcement cage and template.
The template of the embodiment is a cylindrical structure with an outer bottom edge formed by splicing 3 arc-shaped steel templates 10 with bottoms. The bottom-equipped arc-shaped steel template 10 consists of an arc-shaped side template 1 and a bottom template 2, the bottom template 2 is a 120-degree sector, and the radius of a small arc of the sector-shaped bottom template is the same as the arc radius of the cross section of the arc-shaped template; one end of the arc-shaped side template 1 is vertically welded on the end surface of the small arc of the sector bottom template; a cylinder is formed from 3 curved sideforms 1 as shown in figure 3. 3 bottom templates 2 with 120-degree sector surfaces form an annular surface; the annular surface is closely connected with the lower end of the arc-shaped side template, and the annular surface of the bottom template is used for placing a reinforcement cage.
As can be seen from fig. 4, the cross-sectional view in the vertical direction of the steel form with bottom arc is "L" shape, the vertical part is the arc-shaped side form, and the lower horizontal part is the bottom form.
As shown in fig. 1, the construction method for the ex-situ casting and jacking in-place dug pile retaining wall of the embodiment is as follows:
(1) pouring concrete at the hole opening to form a first layer of retaining wall support, and continuously digging a hole downwards with the depth of 1.2m after the pouring of the concrete retaining wall at the hole opening of the hole digging pile is finished;
(2) installing jacks at joints of the steel modules, and installing 3 jacks in total;
(3) placing a retaining wall circular ring-shaped reinforcement cage on the jack;
(4) a bottom arc-shaped steel template 10 is installed, and a bottom template 2 is installed between a jack and the upper portion and the lower portion of a reinforcement cage; the arc-shaped side templates are uniformly installed and connected with each other by 2U-shaped clamps 3; the bottom template is connected with the bottom template by adopting 1U-shaped card 3;
(5) pouring and vibrating the concrete of the protecting wall;
(6) after the retaining wall concrete is dried, a jack pushes the finished retaining wall; when the templates are assembled in an ectopic way, a gap of 0.3m is left between the upper part of the concrete of the retaining wall of the layer and the concrete retaining wall of the upper layer for pouring and vibrating the concrete, and the retaining wall without a wrong platform is formed after jacking;
(7) curing the newly poured concrete;
(8) digging a hole downwards near the middle part of the digging pile;
(9) after the newly poured breast wall concrete is initially set, the jack is removed, and the mold is loosened and removed;
(10) and (5) continuously digging holes downwards, and repeating the steps (1) to (9) until the hole digging pile is finished.
Fig. 5 shows the construction drawing of the wall protection ectopic pouring.
In fig. 5, the upper part of a pile hole is a first layer of retaining wall support, the bottommost part of the hole is provided with 3 jacks, and the jacks are placed along the circumferential direction, wherein the number of the jacks is 120 degrees; the jack is provided with a bottom arc steel template 10, and 3 bottom arc steel templates 10 are spliced along the circumference of the pile hole to form a cylinder with an outer bottom plate and are installed by adopting a U-shaped clamp. A steel reinforcement cage is arranged on the annular surface formed by the bottom template. And a space of a concrete pouring opening is reserved between the upper end of the arc-shaped steel template with the bottom and the first-layer retaining wall support, so that concrete is poured conveniently.
Fig. 6 shows the wall in the jacking position.
In fig. 6, after the retaining wall concrete is dried, the jack pushes the finished retaining wall; when the templates are assembled in an ectopic mode, a gap of 0.3m is reserved between the upper portion of the concrete retaining wall of the layer and the concrete retaining wall of the upper layer, the concrete is poured and vibrated, and the retaining wall without a wrong platform is formed after jacking.
Claims (6)
1. A kind of heterotopic pours and jacks up and digs the hole pile dado device in place, including jack and template, characterized by that, the said template is spliced into the cylindrical structure with external base edge by the arcuate steel form of multiple bottomed ends; the bottom-equipped arc-shaped steel template consists of an arc-shaped side template and a bottom template, the bottom template is a sector, and the radius of a small arc of the bottom template of the sector is the same as the arc radius of the cross section of the arc-shaped template; one end of the arc-shaped side template is vertically welded on the end surface of the small arc of the sector bottom template; a cylinder is formed by a plurality of arc templates, and an annular surface is formed by a plurality of bottom templates; the annular surface is closely connected with the lower end of the arc-shaped side template, and the annular surface of the bottom template is used for placing a reinforcement cage.
2. The device for casting and jacking in-place pile retaining walls in different positions according to claim 1, wherein the arc-shaped side templates are connected with each other through U-shaped connectors; the bottom die plate is connected with the bottom die plate through a U-shaped card.
3. The ex-situ casting jacking in-place bored pile dado device of claim 1, wherein the plurality of bottom arc-shaped steel templates, preferably 2-4 bottom arc-shaped steel templates.
4. The ex-situ casting jacking in-place bored pile dado device of claim 1, wherein the width of the bottom formwork is the dado thickness and is 8-15 cm.
5. The ex-situ casting jacking in-place bored pile dado device according to claim 1, wherein the length of the device is 50-80 cm; the upper end of which is slightly bent outwards.
6. The device for casting and jacking in-place the dado of the bored pile in the different positions according to claim 1, wherein the construction method for casting and jacking in-place the dado of the bored pile in the different positions is as follows:
(1) pouring concrete at the hole opening to form a first layer of retaining wall support, and continuously digging a hole downwards after the pouring of the concrete retaining wall at the hole opening of the hole digging pile is finished, wherein the depth is determined according to geological conditions and is usually 0.8-1.2 m;
(2) installing jacks at joints of the steel modules, wherein the number of the jacks is determined according to the number of the modules;
(3) a circular steel reinforcement cage with a protective wall is arranged,
(4) a bottom arc-shaped steel template is installed, and the bottom template is installed between the jack and the upper part and the lower part of the reinforcement cage; the arc-shaped side templates are uniformly installed and connected with each other by adopting 2U-shaped clamps; the bottom template is installed and connected with the bottom template through 1U-shaped clamp;
(5) pouring and vibrating the concrete of the protecting wall;
(6) after the retaining wall concrete is dried, a jack pushes the finished retaining wall; when the templates are assembled in an ectopic mode, a gap of 0.2-0.3 m is reserved between the upper portion of the concrete retaining wall of the layer and the concrete retaining wall of the upper layer, the concrete is poured and vibrated, and the retaining wall without a wrong platform is formed after jacking;
(7) curing the newly poured concrete;
(8) digging a hole downwards near the middle part of the digging pile;
(9) after the newly poured breast wall concrete is initially set, the jack is removed, and the mold is loosened and removed;
(10) and (5) continuously digging holes downwards, and repeating the steps (1) to (9) until the hole digging pile is finished.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010730468.1A CN111827280B (en) | 2020-07-27 | 2020-07-27 | Ex-situ pouring, jacking and in-place hole digging pile retaining wall device and construction method thereof |
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| CN202010730468.1A CN111827280B (en) | 2020-07-27 | 2020-07-27 | Ex-situ pouring, jacking and in-place hole digging pile retaining wall device and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709217A (en) * | 2020-12-24 | 2021-04-27 | 中铁大桥局集团第六工程有限公司 | Formwork assembly of reverse construction method retaining wall and retaining wall construction method |
| CN115419069A (en) * | 2022-09-30 | 2022-12-02 | 中国一冶集团有限公司 | Construction method for retaining wall of manual hole digging pile |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709217A (en) * | 2020-12-24 | 2021-04-27 | 中铁大桥局集团第六工程有限公司 | Formwork assembly of reverse construction method retaining wall and retaining wall construction method |
| CN112709217B (en) * | 2020-12-24 | 2022-05-17 | 中铁大桥局集团第六工程有限公司 | Formwork assembly of reverse construction method retaining wall and retaining wall construction method |
| CN115419069A (en) * | 2022-09-30 | 2022-12-02 | 中国一冶集团有限公司 | Construction method for retaining wall of manual hole digging pile |
| CN115419069B (en) * | 2022-09-30 | 2024-01-12 | 中国一冶集团有限公司 | Construction method for retaining wall of manual hole digging pile |
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