CN111851588A - Pipe jacking well structure and construction method thereof - Google Patents
Pipe jacking well structure and construction method thereof Download PDFInfo
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- CN111851588A CN111851588A CN202010675595.6A CN202010675595A CN111851588A CN 111851588 A CN111851588 A CN 111851588A CN 202010675595 A CN202010675595 A CN 202010675595A CN 111851588 A CN111851588 A CN 111851588A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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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
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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Abstract
The invention discloses a pipe jacking well structure and a construction method thereof, wherein the pipe jacking well structure comprises a plurality of steel plate piles which are vertically and detachably inserted in soil, and a hollow construction space is enclosed by the plurality of steel plate piles; at least one layer of enclosing purlin structure is fixedly arranged on the inner side of the steel sheet pile in the construction space; the enclosing purlin structure comprises a plurality of enclosing purlins fixedly arranged on the inner side surfaces of the steel sheet piles, the plurality of enclosing purlins are sequentially fixed and connected end to end, the bottom of each enclosing purlin is provided with a support piece, and a corner brace is connected between every two adjacent enclosing purlins; and the lower part of the steel sheet pile is provided with an open caisson body. The pipe jacking well structure and the construction method thereof can not only exert the characteristics of convenient construction and high efficiency of the steel sheet pile, but also exert the advantages of high rigidity, high side wall bearing capacity, good integrity, high safety and the like of the reinforced concrete open caisson, and can give consideration to efficiency, economy and safety to the maximum extent, thereby achieving the aims of effectively shortening the construction period and reducing the construction cost.
Description
Technical Field
The invention relates to the field of underground building structures and municipal engineering, in particular to a pipe jacking well structure and a construction method thereof.
Background
Due to the shortage of the investment of environmental management and the fragile ecological environment system, the problem of environmental pollution is prominent. Particularly in the field of water environment, the phenomena of incomplete pipe network system, direct discharge of domestic sewage and the like are still common, the water ecology is seriously damaged, and the environmental hidden danger is more. In the concrete implementation process of pipe network engineering, the construction method of the pipeline is determined by comprehensive comparison of technology and economy according to the soil layer property, pipe diameter, underground water level, nearby underground and overground buildings and other factors of the pipeline. When the excavation condition is met, the pipeline can be laid in an open ditch excavation form or support excavation is adopted; when the pipeline is buried deeply and the excavation working surface is limited or the slope cannot be set due to the soil condition, the construction can be carried out by adopting a pipe jacking mode, a traction mode and other subsurface excavation modes.
In the prior art, a pipe network for improving a water environment is generally improved aiming at the existing sewage pipe network in an old city. In the transformation process, the pipelines of the sewage pipe network except part of main trunk pipes and most of branch pipes go deep into the community, so that the life of residents nearby is greatly influenced if the community is excavated, and meanwhile, because the community has narrow roads and both sides of the roads are civil houses which are long-term, the open excavation construction has greater risk, so the underground excavation construction method is a main pipeline construction method in the projects.
According to the feedback of practical engineering experience, the pipeline constructed in a traction mode presents a wavy condition in a soil layer, silting is easy to generate after a long time, so that the drainage effect is influenced, and a pipe-jacking construction method is preferably selected in many areas when an underground excavation construction method is selected. The pipe-jacking well structure is generally constructed by using an open caisson method or a reverse method. The construction personnel can operate outside the well during the open caisson method construction, the operation process is safe, the influence of small soil excavation amount on adjacent buildings is small, the reverse method needs to cast reinforced concrete after excavation, drainage operation should be carried out before construction, the construction period is long, and for areas with high underground water level, poor soil quality and complex surrounding environment, the open caisson method is generally selected for constructing the pipe jacking well.
In the open caisson construction method in the prior art, the open caisson sinking speed is low, the peripheral soil body can be pulled down and deformed in the open caisson sinking process, the local part can also generate flowing soil and gushing sand, and the stability of the foundation constructed nearby the periphery can be greatly influenced. In addition, the reinforced concrete open caisson and other related supporting structures have no reusability, and the cost and the waste are high when the reinforced concrete open caisson and other related supporting structures are used as temporary supports. On the other hand, in some projects, steel sheet pile supports are adopted to directly serve as pipe jacking wells, the steel sheet pile supports have the advantage of high construction efficiency, but the steel sheet piles are low in rigidity, and when the steel sheet piles are used as the pipe jacking well, if jacking force is too large, the steel sheet piles can deform greatly, upper steel supports can fall off due to too large deformation, and great construction risks exist.
In conclusion, a construction method which can not only bring the characteristics of convenience and high efficiency of steel sheet pile construction into play, but also bring the advantages of high rigidity, high side wall bearing capacity, good integrity, high safety and the like of the reinforced concrete open caisson into play is needed, and meanwhile, the temporary support can be repeatedly used for many times, so that the efficiency, economy and safety are maximally considered, and the purposes of effectively shortening the construction period and reducing the construction cost are achieved.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a pipe jacking well structure which can not only exert the characteristics of convenient construction and high efficiency of a steel sheet pile, but also exert the advantages of high rigidity, high side wall bearing capacity, good integrity, high safety and the like of a reinforced concrete open caisson, can be repeatedly used, and takes efficiency, economy and safety into consideration to the maximum extent, thereby achieving the aims of effectively shortening the construction period and reducing the construction cost; the invention also aims to provide a construction method of the pipe jacking well structure.
In order to achieve the purpose, the invention provides a pipe jacking well structure which comprises a plurality of steel plate piles vertically and detachably inserted in soil, wherein a hollow construction space is defined by the steel plate piles;
At least one layer of enclosing purlin structure is fixedly arranged on the inner side of the steel sheet pile in the construction space;
the enclosing purlin structure comprises a plurality of enclosing purlins fixedly arranged on the inner side surfaces of the steel sheet piles, the plurality of enclosing purlins are sequentially fixed and connected end to end, the bottom of each enclosing purlin is provided with a support piece, and a corner brace is connected between every two adjacent enclosing purlins;
and the lower part of the steel sheet pile is provided with an open caisson body.
As a preferred scheme, the number of the enclosing purlins is four, and the four enclosing purlins enclose a square;
the enclosing purlin is made of I-shaped steel.
Preferably, the support piece is a steel bracket;
the steel bracket comprises a supporting plate which is horizontally arranged and fixedly connected with the bottom of the enclosing purlin, and a triangular rib plate is vertically and fixedly arranged at the bottom of the supporting plate;
the supporting plate and the rib plate are arranged in a T shape.
Preferably, medium coarse sand is filled between the open caisson body and the inner wall of the steel sheet pile.
As a preferred scheme, the bottom of the open caisson body is provided with an open caisson bottom plate, and the bottom of the open caisson bottom plate is provided with bottom sealing concrete;
and a jacking pipe rear seat wall is arranged on the open caisson body.
A construction method of a pipe jacking well structure comprises the following steps:
s1, piling a plurality of steel sheet piles subjected to rust prevention treatment, wherein the plurality of steel sheet piles enclose a construction space;
S2, removing earthwork of the first depth of the construction space, and arranging a surrounding purlin structure on the steel sheet pile;
firstly, arranging a support piece, wherein the upper part of the support piece is provided with a plurality of annularly arranged purlins; secondly, angle braces are fixedly arranged on the adjacent surrounding purlins;
s3, continuously removing earthwork of a second depth of the construction space downwards, and setting a surrounding purlin structure;
s4, continuously removing earthwork at a third depth of the construction space downwards, and sequentially arranging a plurality of sections of open caisson;
s5, after all well wall constructions are completed and the foundation pit is excavated to the designed elevation, pouring bottom sealing concrete, and setting a sunk well bottom plate on the bottom sealing concrete after removing accumulated water.
And S6, backfilling the foundation pit and removing the steel surrounding purlin, the angle brace and the steel sheet pile layer by layer after pipe jacking operation.
Preferably, in the step 1, before the steel sheet pile is sunk, the steel sheet pile is positioned by paying off on site according to the requirements of design paper, a guide frame is arranged, and waterproof materials are filled in the locking notch;
the verticality deviation of the steel plate pile sinking is not more than 1/100.
Preferably, the first depth is 1 meter, the second depth is 4 meters, and the third depth is 3 meters.
Preferably, in step S4, the step of pouring the caisson body includes: preparing a bearing pad of the blade foot; binding open caisson reinforcing steel bars and packaging a template; and pouring concrete after the template is packaged, and sinking the open caisson body after the strength of the concrete reaches 75% of the design strength.
As a preferred scheme, the sinking method of the open caisson body adopts soil squeezing and sinking, the soil is uniformly and symmetrically dug, and the balance, uniformity and stable sinking of the open caisson are ensured;
before sinking, medium coarse sand which sinks synchronously along with the open caisson is arranged between the well wall of the open caisson body and the steel sheet pile wall.
Compared with the prior art, the invention has the beneficial effects that:
the pipe jacking well structure uses the steel sheet piles as supports in the open caisson construction method, a plurality of steel sheet piles vertically inserted into soil are used for enclosing to form a hollow construction space, and at least one layer of enclosing purlin structure is fixedly arranged on the inner side of each steel sheet pile in the construction space; the enclosing purlin structure comprises a plurality of enclosing purlins fixedly arranged on the inner side surfaces of the steel sheet piles, the plurality of enclosing purlins are sequentially fixed and connected end to end, the bottom of each enclosing purlin is provided with a support piece, and an angle brace is connected between every two adjacent enclosing purlins; the lower part of the steel sheet pile is provided with an open caisson body. After the open caisson construction is completed, the steel surrounding purlin, the angle brace and the steel sheet pile can be sequentially detached, and the steel sheet pile is recycled. The steel sheet pile is used as a sunk well support, the support is formed in the range of 5m to 6m on the upper portion of a foundation pit of the pipe jacking well by utilizing the characteristic that the steel sheet pile is convenient and fast to construct, and then the support structure is formed in the range of 4m to 5m on the lower portion of the foundation pit for the operation of the pipe jacking well structure by utilizing the characteristic that the sunk well is high in rigidity, so that the advantages of the steel sheet pile and the sunk well construction are brought into play as far as possible, and the advantages are complementary.
The construction method of the pipe jacking well structure can not only exert the characteristics of convenience and high efficiency of steel sheet pile construction, but also exert the advantages of high rigidity, high side wall bearing capacity, good integrity, high safety and the like of the reinforced concrete open caisson, and the steel sheet pile and the surrounding purlin structure can be recycled to maximize the efficiency, economy and safety, thereby achieving the purposes of effectively shortening the construction period and reducing the construction cost.
Drawings
FIG. 1 is a schematic structural diagram of a top tube well structure in an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
fig. 3 is a schematic structural diagram of a purlin structure.
In the figure, 1, steel sheet piles; 2. steel corbels; 21. a support plate; 22. a rib plate; 3. steel purlin; 4. a steel gusset; 5. an open caisson body; 6. medium coarse sand; 7. sealing bottom concrete; 8. a bottom plate of the open caisson; 9. the pipe jacking rear seat wall.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
The preferred embodiment of the pipe jacking well structure comprises a plurality of steel sheet piles 1 which are vertically and detachably inserted into soil, and a hollow construction space is enclosed by the plurality of steel sheet piles 1, as shown in figure 1; the steel sheet pile 1 is a straight rod-shaped structure, the section of the steel sheet pile can be square or semicircular, and the like, and at least one layer of enclosing purlin structure is fixedly arranged on the inner side of the steel sheet pile 1 in the construction space; and the purlin enclosing structure is used for supporting and maintaining the steel sheet pile 1.
The purlin structure includes that a plurality of fixed purlins 3 that enclose of locating 1 medial surface of steel sheet pile, a plurality of purlin 3 that enclose fix in proper order and end to end connection, and each encloses purlin 3 and steel sheet pile 1 and is welded fastening, and the bottom that each encloses purlin 3 all is equipped with support piece, support piece simultaneously with steel sheet pile 1 with enclose purlin fixed connection, support piece is steel material simultaneously, support piece and steel sheet pile 1 enclose purlin welded fastening with the steel. The angle braces 4 are connected between the adjacent surrounding purlins 3 so as to further improve the supporting strength of the surrounding purlin structure; the lower part of the steel sheet pile 1 is provided with a sunk well body 5.
The pipe jacking well structure can sequentially remove the surrounding purlin 3, the corner brace 4 and the steel sheet pile 1 after the open caisson construction is completed, and the steel sheet pile 1 is recycled. The steel sheet pile 1 is used as an open caisson support, a support is formed in the range from 5m to 6m at the upper part of a foundation pit of the push caisson by utilizing the characteristic that the steel sheet pile 1 is convenient and quick to construct, and then a support structure is formed in the range from 4m to 5m at the lower part of the foundation pit for the operation of the push caisson structure by utilizing the characteristic that the open caisson is high in rigidity, so that the respective advantages of the steel sheet pile 1 and the open caisson construction are brought into play as much as possible, and the advantages are complementary.
The pipe jacking well structure can not only exert the characteristics of convenient construction and high efficiency of the steel sheet pile 1, but also exert the advantages of high rigidity, high side wall bearing capacity, good integrity, high safety and the like of the reinforced concrete open caisson body, and the steel sheet pile 1 and the surrounding purlin 3 structure can be recycled to maximize the efficiency, economy and safety, thereby achieving the purposes of effectively shortening the construction period and reducing the construction cost.
Wherein, in the embodiment of this application, enclose purlin 3 and be equipped with four, enclose purlin 3 and specifically be the I-steel, four enclose purlin 3 and enclose into square form, and gusset 4 is platelike structure, and gusset 4 also is four, inclines to establish respectively on four angles of enclosing the purlin structure for connect adjacent two and enclose purlin 3.
Further, support piece 2 is the steel bracket, and is concrete, the steel bracket including the level arrange and with enclose bottom fixed connection's of purlin 3 backup pad 21, backup pad 21 and the bottom of enclosing purlin 4 can welded fastening or through fastener fixed connection such as bolt, the bottom of backup pad 21 is vertical fixed to be equipped with triangular's floor 22, backup pad 21 and floor 22 are the T type and arrange. The rib 22 is used for supporting the support plate 21 and improving the fixing function of the support plate 21.
Wherein, it has well coarse sand to fill between the inner wall of open caisson body 5 and steel sheet pile 1, and well coarse sand sinks along open caisson body 5 in step, is convenient for open caisson body 5's construction.
The bottom of the open caisson body 5 is provided with an open caisson bottom plate 8, and the bottom of the open caisson bottom plate 8 is provided with bottom sealing concrete 7; the open caisson body 5 is provided with a pipe jacking rear seat wall 9.
During the specific construction, after the first section of the open caisson body 5 is sunk, the next section of the open caisson body 5 is constructed according to the same steps. And after the construction of all the open caisson bodies 5 is completed and the foundation pit is excavated to the designed elevation, pouring bottom sealing concrete 7 in time, wherein the bottom sealing concrete 7 can be used for selecting precipitation bottom sealing or underwater bottom sealing according to the construction method of the open caisson. And (4) after the bottom sealing concrete 7 is poured, draining accumulated water in the open caisson pit, constructing an open caisson bottom plate 8, and finishing the excavation work of the pipe jacking well. And after the construction of the open caisson bottom plate 8 is completed, constructing a pipe-jacking rear seat wall 9, installing pipe-jacking equipment and performing pipeline jacking operation, after the pipe-jacking operation is completed, constructing a corresponding inspection well as required, backfilling a foundation pit and removing horizontal supporting structures such as steel surrounding purlins and angle braces layer by layer. And (3) recovering the steel sheet pile 1 after the foundation pit is backfilled as required, and filling holes in the pile position by using medium sand or grouting.
The embodiment of the construction method of the pipe jacking well structure comprises the following steps:
and S1, piling the plurality of steel sheet piles 1 subjected to the rust prevention treatment, and enclosing the plurality of steel sheet piles 1 to form a construction space.
Before the steel sheet pile 1 is constructed, the steel sheet pile 1 is subjected to paying-off and positioning on site according to the requirements of design paper, so that the construction space surrounded by the steel sheet pile 1 can meet the requirements of subsequent open caisson body 5 construction, and the steel sheet pile 1 is subjected to rust prevention treatment before pile sinking, and can be specifically coated with epoxy coal tar pitch paint for protection. The locking notch should be filled with waterproof material. A guide frame is arranged before the steel sheet pile 1 is sunk so as to ensure the accuracy of the plane dimension. The verticality deviation in pile sinking should not be greater than 1/100, and the locking notch should be ensured to be tight.
S2, removing earthwork with a first depth of the construction space, and arranging a surrounding purlin structure on the steel sheet pile 1;
firstly, a support piece 21 is arranged, and a plurality of annularly arranged surrounding purlins 3 are arranged at the upper part of the support piece 21; and secondly, corner supports 4 are fixedly arranged on the adjacent surrounding purlins 3.
And (3) carrying out earth excavation after the construction of the steel sheet pile 1 is finished, and constructing a first purlin surrounding structure when the excavation is about 1 m deep. The steel bracket is constructed before constructing the purlin 3, the steel bracket comprises a supporting plate 21 and a rib plate 22, the supporting plate 21 and the rib plate 22 are welded and fixed in a T shape, as shown in fig. 3, the supporting plate 21 and the rib plate 22 are welded with the steel sheet pile 1, the quality grade of a welding line is three-grade, and the next construction can be carried out after appearance inspection and acceptance. And (3) continuing downward excavation after the construction of the horizontal supporting structures such as the first enclosing purlin 3 and the angle brace 4 is finished, and constructing a second enclosing purlin structure when the excavation is about 4 meters deep, wherein the construction method of the second enclosing purlin structure is the same as that of the first enclosing purlin structure.
And S3, continuously removing earthwork at the third depth of the construction space downwards, and sequentially arranging the multiple sections of open caisson bodies 5. The open caisson body 5 can be reasonably selected to be drained and sunk or not according to specific geological conditions during construction. When underground water exists in the sinking depth range of the open caisson body 5 and silt or fine sand layers exist in soil layers or existing buildings or structures exist near the open caisson, sinking without drainage is recommended.
Specifically, the height of the first section of well wall body 5 containing the edge feet is about 2.5m, and after cushion facilities of the edge feet are prepared, open caisson steel bars are bound and templates are packaged. And after the template is packaged, pouring concrete, and after the strength of the concrete poured by the open caisson body 5 reaches 75% of the designed strength, beginning to sink the open caisson body 5. When the open caisson body 5 sinks, soil squeezing and sinking are adopted, the cutting edge can not be hollowed randomly, the soil digging is uniform and symmetrical, and effective measures are taken to keep the open caisson body to sink uniformly, uniformly and stably. Before sinking, the open caisson body 5 is filled with medium coarse sand 6 between the open caisson wall and the steel sheet pile 1 wall, and the medium coarse sand 6 sinks synchronously along with the open caisson wall 5. And after the first section of the open caisson body 5 is sunk, constructing the next section of the open caisson body 5 according to the same method.
And S4, after all the well walls are constructed and the foundation pit is excavated to the designed elevation, pouring bottom sealing concrete 7, wherein the bottom sealing concrete 7 can be used for selecting precipitation bottom sealing or underwater bottom sealing according to the construction method of the open caisson body 5, then removing accumulated water, and arranging an open caisson bottom plate 8 on the bottom sealing concrete 7. And finally, constructing the pipe jacking rear seat wall 9, installing pipe jacking equipment and carrying out pipeline jacking operation.
And S5, backfilling the foundation pit and removing the surrounding purlin 3, the corner brace 4 and the steel sheet pile 1 layer by layer after pipe jacking operation.
And after the pipe jacking operation is completed, constructing a corresponding inspection well as required, backfilling the foundation pit and removing horizontal supporting structures such as the steel purlins 3 and the angle braces 4 layer by layer. And (3) backfilling the foundation pit as required to finish the rear recyclable steel sheet pile 11, and filling the hole at the pile position of the steel sheet pile 11 by using medium sand or grouting.
The construction method of the pipe jacking well structure can not only exert the characteristics of convenience and high efficiency of the steel sheet pile 1 in construction, but also exert the advantages of high rigidity, high side wall bearing capacity, good integrity, high safety and the like of the reinforced concrete open caisson body, and the steel sheet pile 1 and the purlin enclosing structure can be recycled, so that the efficiency, economy and safety are maximally considered, and the purposes of effectively shortening the construction period and reducing the construction cost are achieved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A pipe jacking well structure is characterized by comprising a plurality of steel plate piles which are vertically and detachably inserted in soil, wherein a hollow construction space is defined by the steel plate piles;
at least one layer of enclosing purlin structure is fixedly arranged on the inner side of the steel sheet pile in the construction space;
the enclosing purlin structure comprises a plurality of enclosing purlins fixedly arranged on the inner side surfaces of the steel sheet piles, the plurality of enclosing purlins are sequentially fixed and connected end to end, the bottom of each enclosing purlin is provided with a support piece, and a corner brace is connected between every two adjacent enclosing purlins;
and the lower part of the steel sheet pile is provided with an open caisson body.
2. The pipe jacking well structure of claim 1, wherein the purlins are four, and four purlins enclose a square;
the enclosing purlin is made of I-shaped steel.
3. The pipe jacking well structure of claim 2, wherein said support member is a steel corbel;
the steel bracket comprises a supporting plate which is horizontally arranged and fixedly connected with the bottom of the enclosing purlin, and a triangular rib plate is vertically and fixedly arranged at the bottom of the supporting plate;
The supporting plate and the rib plate are arranged in a T shape.
4. The push bench structure of claim 1, wherein medium grit is filled between said caisson body and the inner wall of said steel sheet pile.
5. The push bench structure of claim 1, wherein a bottom plate of the open caisson is arranged at the bottom of the open caisson body, and bottom sealing concrete is arranged at the bottom of the open caisson plate;
and a jacking pipe rear seat wall is arranged on the open caisson body.
6. A pipe jacking well structure construction method according to any one of claims 1 to 5, comprising the steps of:
s1, piling a plurality of steel sheet piles subjected to rust prevention treatment, wherein the plurality of steel sheet piles enclose a construction space;
s2, removing earthwork of the first depth of the construction space, and arranging a surrounding purlin structure on the steel sheet pile;
firstly, arranging a support piece, wherein the upper part of the support piece is provided with a plurality of annularly arranged purlins; secondly, angle braces are fixedly arranged on the adjacent surrounding purlins;
s3, continuously removing earthwork of a second depth of the construction space downwards, and setting a surrounding purlin structure;
s4, continuously removing earthwork at a third depth of the construction space downwards, and sequentially arranging a plurality of sections of open caisson;
S5, after all well wall constructions are completed and the foundation pit is excavated to the designed elevation, pouring bottom sealing concrete, and setting a sunk well bottom plate on the bottom sealing concrete after removing accumulated water.
And S6, backfilling the foundation pit and removing the steel surrounding purlin, the angle brace and the steel sheet pile layer by layer after pipe jacking operation.
7. The pipe jacking well structure construction method according to claim 6, wherein in the step 1, before the steel sheet pile is sunk, the steel sheet pile is positioned by paying off on site according to the design drawing requirements, a guide frame is arranged, and waterproof materials are filled in the locking opening;
the verticality deviation of the steel plate pile sinking is not more than 1/100.
8. The pipe jacking well structure construction method according to claim 6, wherein the first depth is 1 m, the second depth is 4 m, and the third depth is 3 m.
9. The pipe jacking well structure construction method according to claim 6, wherein in the step S4, the step of pouring the caisson body is as follows: preparing a bearing pad of the blade foot; binding open caisson reinforcing steel bars and packaging a template; and pouring concrete after the template is packaged, and sinking the open caisson body after the strength of the concrete reaches 75% of the design strength.
10. The pipe jacking well structure construction method according to claim 9, wherein the sinking method of the sinking well body adopts soil squeezing sinking, the soil digging is uniform and symmetrical, and the balanced, uniform and stable sinking of the sinking well is ensured;
Before sinking, medium coarse sand which sinks synchronously along with the open caisson is arranged between the well wall of the open caisson body and the steel sheet pile wall.
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| CN202010675595.6A CN111851588A (en) | 2020-07-14 | 2020-07-14 | Pipe jacking well structure and construction method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113089689A (en) * | 2021-04-25 | 2021-07-09 | 江苏天启建设有限公司 | Working well with support system and construction method thereof |
| CN113186942A (en) * | 2021-05-11 | 2021-07-30 | 中建八局第一建设有限公司 | Pipe jacking well enclosure structure and excavation construction method |
| CN115233703A (en) * | 2022-08-12 | 2022-10-25 | 中国五冶集团有限公司 | Detachable pipe jacking working well support and construction process thereof |
| CN115492126A (en) * | 2022-10-26 | 2022-12-20 | 中国电建集团西北勘测设计研究院有限公司 | Steel sheet pile and vertical shaft combined foundation pit supporting structure and method |
| CN116043921A (en) * | 2023-03-13 | 2023-05-02 | 中交上海航道局有限公司 | Construction method for steel-concrete combined structure retaining wall of water supply and drainage top pipe well |
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2020
- 2020-07-14 CN CN202010675595.6A patent/CN111851588A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113089689A (en) * | 2021-04-25 | 2021-07-09 | 江苏天启建设有限公司 | Working well with support system and construction method thereof |
| CN113186942A (en) * | 2021-05-11 | 2021-07-30 | 中建八局第一建设有限公司 | Pipe jacking well enclosure structure and excavation construction method |
| CN115233703A (en) * | 2022-08-12 | 2022-10-25 | 中国五冶集团有限公司 | Detachable pipe jacking working well support and construction process thereof |
| CN115492126A (en) * | 2022-10-26 | 2022-12-20 | 中国电建集团西北勘测设计研究院有限公司 | Steel sheet pile and vertical shaft combined foundation pit supporting structure and method |
| CN116043921A (en) * | 2023-03-13 | 2023-05-02 | 中交上海航道局有限公司 | Construction method for steel-concrete combined structure retaining wall of water supply and drainage top pipe well |
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