CN110485468B - Permanent circular working well with water-rich stratum preset jacking pipe door opening and construction method thereof - Google Patents
Permanent circular working well with water-rich stratum preset jacking pipe door opening and construction method thereof Download PDFInfo
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- 239000004576 sand Substances 0.000 claims abstract description 6
- 238000009415 formwork Methods 0.000 claims description 9
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Classifications
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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
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
-
- 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
- E02D23/16—Jointing caissons to the foundation soil, specially to uneven foundation soil
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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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/125—Manhole shafts; Other inspection or access chambers; Accessories therefor characterised by the lining of the shaft
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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
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
- E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
Abstract
The invention provides a permanent circular working well with a preset jacking pipe door opening in a water-rich stratum and a construction method thereof. The invention specifically comprises the following steps: designing the functional requirements of the round working well; (II) constructing a round working well maintenance structure open caisson; (III) temporary edge-facing protection construction; fourthly, excavating earthwork in the well; (V) sealing the bottom of the circular working well; sixthly, mounting a ladder entering the round working well; (VII) seam leakage treatment; (eighth), mounting a hole water stop pressing plate; ninthly, lifting a sandwich concrete slab wall at the top of the preset door opening; (ten) jacking construction of the jacking pipe; (eleven) related work implementation and acceptance such as pipeline communication in the well, valve installation and the like; and (twelfth) temporary edge-facing protection removal, installation of a top cover plate of the circular working well and the inspection well and waterproof construction. The structural system constructed by the method has the advantages of clear function, safety, rapidness, flexible design and the like, particularly overcomes the potential safety hazard of sudden water burst and sand gushing in the process that the jacking pipe penetrates through the well wall, and provides a new method for the non-excavation construction of underground pipelines of water conservancy, municipal administration, heat power, communication and the like.
Description
Technical Field
The invention belongs to the field of trenchless construction and repair of infrastructure of water conservancy, municipal administration, heating power, communication and the like, and particularly relates to a permanent circular working well with a water-rich stratum preset pipe jacking door opening and a construction method thereof, which are provided for trenchless construction and repair of underground pipelines of water conservancy, municipal administration, heating power, communication and the like.
Background
The process of urbanization is accelerated, a large number of underground foundation supporting facilities need to be newly built, and the problem of rectification, modification and upgrading of a large number of old underground pipelines is also solved, so that underground pipe networks of a plurality of urban roads are very complicated, and road surface collapse and safety accidents caused by damage of the underground pipelines are frequent. Under the condition that the passing requirement and the green environmental protection idea are increasingly emphasized by people, the conventional excavation and landfill construction is low in construction efficiency, faces serious post-construction settlement and is mainly used for construction of shallow-buried rainwater and sewage pipelines in newly-built urban areas. The trenchless construction technologies such as directional drilling and pipe-jacking construction gradually become the mainstream technology of urban underground pipelines, wherein the pipe-jacking construction is flexible in section selection and large in buried depth, the conflict with the existing pipeline on the upper portion can be effectively avoided, and only a small range is needed to be provided with a corresponding working well, a receiving well, a relay and the like, so that the long-distance underground pipeline construction needs can be realized, and more attention is paid by engineers. In addition, the rectification upgrading problem of a large amount of old pipe networks in old cities is when adopting the small-section piping lane structure of pipe-jacking formula construction, and the urgent need sets up interim working well, more needs to set up the permanent working well of a certain amount to guarantee pipeline's operation and maintenance needs. At present, regarding the design and construction of a working well, a receiving well and a middle part, a sunk well process or an inverted well process is mainly selected, although the sunk well process or the inverted well process is safe and reliable, the cost is high, the construction period is long, and unstable accidents caused by difficult sinking, improper inclination and operation occasionally exist.
Particularly, in cities in the south of China, rivers are densely distributed, the underground water level is high, most of the underground water level belongs to a water-rich stratum, and in order to save investment, a working well is generally used as a permanent equipment maintenance well. In addition, the most critical link is that before the construction of the water-rich stratum pipe jacking, the rear door opening is a very dangerous process, so that the time consumption is long, the operation difficulty is high, the construction period is long, and accidents such as piping, sand flowing and peripheral collapse are easy to happen. Therefore, the design and construction method of the safer and more reliable working well and jacking pipe door opening suitable for the water-rich stratum becomes a great demand for further development of the industry.
Disclosure of Invention
The invention provides a permanent circular working well with a preset pipe jacking door opening in a water-rich stratum and a design and construction method thereof, aiming at the non-excavation construction and repair development requirements of underground pipelines of water conservancy, municipal administration, heating power, communication and the like and the defects of the design and construction of the working well in the water-rich stratum at present. The invention provides and adopts the concept that a jacking pipe door opening adopts a thin-wall plain concrete cavity and a working well structure to be synchronously designed and implemented for the first time based on the safety and the application of building a round working well in a water-rich stratum, and introduces the design and construction process of a sandwich concrete slab wall into a working well structure system for the first time. The invention can be used for safely and quickly completing the construction of the circular working well required by the trenchless construction of underground pipelines such as water conservancy, municipal administration, heating power, communication and the like, and after the operation in the well is finished, the top cover plate of the working well is added and the waterproof treatment is carried out, so that the invention is used as a new design and construction method of the circular working well required by the trenchless construction of the underground pipelines such as water conservancy, municipal administration, heating power, communication and the like, is safe and reliable, has advanced technical concept, is economical and applicable, and can be used as a permanent working well.
The technical scheme of the invention is as follows:
a construction method of a permanent circular working well with a pre-arranged jacking pipe door opening in a water-rich stratum comprises the following steps,
the functional requirement design of the (first) round working well comprises:
(1) collecting related data, and determining the plane size and depth meeting the requirements of the operation in the well and the processing mode of the bottom sealing of the working well;
(2) determining the elevation and the diameter of a preset pipe jacking door opening according to the position, the diameter, the material, the connection mode and the like of the to-be-built pipeline, wherein the number of the preset pipe jacking door openings is at least one;
(3) calculating and drawing the structure of the round working well: comparing, calculating and analyzing by adopting a rod system unit method and numerical simulation, obtaining the optimal circular working well supporting structure composition, and then drawing to complete the design work of the functional requirements of the circular working well;
(II) the construction of the envelope open caisson of the round working well comprises the following concrete steps:
(1) preparation work before open caisson construction: the method comprises the steps of field leveling, paying off, first-layer earthwork excavation, substrate tamping, leveling and paying off, wire inspection, sand laying cushion, blade support formwork, steel bar binding, well body formwork, concrete pouring, maintenance and formwork removal;
(2) sinking the open caisson section by section: the method comprises sinking preparation, setting vertical transportation machinery and a drainage pump, observation, deviation correction, sinking to a designed elevation section by section and checking the elevation;
(3) in the process of casting the open caisson section by section, a thin-wall plain concrete cavity is arranged on a vertical axis of a preset jacking pipe door opening, and a sandwich concrete plate wall is inserted into the thin-wall plain concrete cavity;
(4) the enclosure structure of the circular working well is made of reinforced concrete or a steel member is used as a permanent structure of the circular working well, and anti-corrosion measures are taken;
(III) edge-facing protection construction: arranging an embedded part when the round working well enclosure structure is used for open caisson construction and pouring, and connecting the edge protection with the embedded part through bolts;
and (IV) excavating the earthwork of the circular working well: in the open caisson construction process, the earthwork of the overwater part is directly excavated, and the soil body of the underwater part is excavated by adopting a high-pressure water gun soil loosening, hydraulic grab bucket soil excavation or pump suction reverse circulation process;
(V) bottom sealing of the circular working well: in order to meet the requirement of subsequent construction, the circular working well is subjected to bottom sealing treatment by adopting concrete, floating resistance and stability are firstly treated by adopting plain concrete, and then the sunk well wall body is connected by adopting reinforced concrete;
and (VI) mounting a ladder entering the circular working well: designing a crawling ladder according to the follow-up maintenance requirement, wherein the crawling ladder is installed on the inner wall of the circular working well by adopting a bar planting process;
(VII) seam leakage treatment: carrying out leakage treatment on a bottom sealing joint of the circular working well and a joint of the side wall of the open caisson of the building envelope by adopting a high polymer material;
(eighth) installation of a hole water stop pressing plate: fixing a water stop pressing plate at the opening through an expansion bolt according to the position of a preset jacking pipe door opening;
(nine) lifting the top sandwich concrete slab wall of the preset pipe jacking door opening: lifting the sandwich concrete slab wall, forming a thin-wall plain concrete cavity at the position of the preset jacking pipe door opening, and reducing the resistance of the jacking pipe machine penetrating through the preset jacking pipe door opening;
(ten) jacking construction of jacking pipes: after the pipe jacking machine is installed in place, by means of hydraulic jacking force, the pipe jacking machine continuously penetrates through a thin-wall plain concrete cavity at a preset pipe jacking door opening part and then normal pipe jacking construction is carried out;
(eleven) related work implementation and acceptance such as pipeline communication and valve installation in the well: after all pipe jacking operations are finished, the pipe jacking machine is hoisted out, and relevant work implementation and acceptance such as pipeline communication, valve installation and the like in the permanent circular working well are started;
and (twelfth) dismantling the temporary protection, installing a top cover plate of the circular working well and the inspection well, and performing waterproof construction.
The utility model provides a circular working well of permanence of pipe jacking door opening is predetermine to rich water stratum, including circular working well, the envelope of circular working well is the open caisson, the bottom of circular working well is the back cover, be close to bottom department in the circular working well and be predetermined pipe jacking door opening, be provided with thin wall plain concrete cavity in the open caisson on the vertical axis of predetermineeing pipe jacking door opening, sandwich concrete siding wall has been inserted in the thin wall plain concrete cavity, the top of open caisson is provided with the top apron, be provided with the inspection shaft on the top apron, install the cat ladder through the bar planting technology on the circular working well inner wall, the cat ladder is located the inspection shaft below.
And a water stop pressing plate is fixed at the hole of the preset jacking pipe door hole through an expansion bolt.
A pipe jacking machine is arranged in the circular working well, a pipe jacking is butted in the thrust direction of the pipe jacking machine, and the pipe jacking machine pushes the pipe jacking to advance towards a preset pipe jacking door opening.
And carrying out seam seepage treatment on the seam between the back cover and the open caisson and the seam on the side wall of the open caisson by using a high polymer material.
Connecting pieces are pre-buried on the open caisson, the upper end of the open caisson is connected with edge protection, and the edge protection is connected with the pre-buried connecting pieces through bolts.
Compared with the prior art, the invention has the technical effects that,
(1) the technical idea is advanced, the idea that the pipe jacking door opening adopts the synchronous design and implementation of the thin-wall plain concrete cavity and the working well structure is innovatively provided for the first time, the construction difficulty and the safety risk of opening the door opening after the water-rich stratum are overcome, the corresponding capital investment is saved, the construction period of the working well is shortened while the underground safe operation space is provided, and the pipe jacking door opening can be used as a permanent working well.
(2) The sandwich concrete slab wall structure is introduced into the enclosure structure for the first time, and the sandwich concrete slab wall structure is matched with the reinforced concrete open caisson to jointly form the work well enclosure structure for use, so that the mechanical property of materials can be effectively exerted, the function of the work well can be ensured, meanwhile, the opening of a pipe jacking door opening can be easily realized only by means of the hydraulic thrust of pipe jacking construction machinery, and the safety and the rapidness are realized.
(3) The leakage and potential leakage parts are treated in advance by adopting the high polymer material, so that the normal performance of the subsequent use function as a permanent inspection well is effectively ensured.
(4) The subsequent permanent service well that uses of working well provides the standardized design and the construction of a set of circular working well structure that can supply the reference for the push pipe construction in rich water area, has avoided the repeated construction of working well and service well, and is economical and practical, resources are saved.
(5) The target guiding is strong, and the comprehensive cost performance is high. Compared with the traditional working well construction technology, the construction method has the greatest characteristic that the guide is performed for the target according to the functional requirements of the working well, the key problems that the working well is used as a permanent equipment inspection well process are solved one by one respectively, the construction method is safe, economical and applicable, the arrangement mode of the jacking pipe door opening is designed flexibly in the field implementation stage, and the influence of construction on the surrounding environment is reduced.
The invention is obviously different from the existing working well technology in the aspects of design and construction concept, structural system stress, construction mode, target guidance, comprehensive utilization value and the like of the circular working well structure, has the advantages of safety, rapidness, advanced technology, high-efficiency recycling, environmental friendliness, economy, ecological harmony and the like, can be successfully applied to the construction project of the circular working well and the permanent inspection well, and has considerable development and application prospects.
Drawings
Fig. 1 is an overall configuration diagram of the present invention.
Fig. 2 is a functional configuration diagram of the circular working well of the present invention.
Fig. 3 is a plan layout configuration view of the circular working well of the present invention.
FIG. 4 is a cross-sectional view of a circular well of the present invention.
Fig. 5 is a structural view of the caisson and the sandwich concrete slab wall of the invention.
Fig. 6 is a structural view of the top cover plate of the present invention.
Fig. 7 is a structural diagram of the hole water stop pressure plate of the invention.
Detailed Description
A construction method of a permanent circular working well with a pre-arranged jacking pipe door opening in a water-rich stratum comprises the following steps of firstly, completing the design of the function requirement of the circular working well; then, sequentially carrying out structure maintenance and temporary protection construction; then, carrying out earthwork excavation in the circular working well and sealing the bottom of the circular working well; mounting a ladder entering the round working well, treating the leakage of joints and mounting a water stop pressing plate at the opening of the hole; then, a hydraulic thrust of the pipe jacking equipment penetrates through a thin-wall plain concrete cavity formed after the sandwich concrete plate wall is lifted, and a door opening is opened; after the related operation in the well is finished, the top cover plate of the circular working well, the inspection well and the waterproof construction are carried out, and then the construction of the permanent circular working well with the water-rich stratum preset pipe jacking door opening can be finished. The method specifically comprises the following steps of,
the functional requirement design of the (first) round working well comprises:
(1) collecting related data, and determining the plane size and depth meeting the requirements of the operation in the well and the processing mode of the bottom sealing of the working well;
(2) determining the elevation and the diameter of a preset pipe jacking door opening according to the position, the diameter, the material, the connection mode and the like of the to-be-built pipeline, wherein the number of the preset pipe jacking door openings is at least one;
(3) calculating and drawing the structure of the round working well: comparing, calculating and analyzing by adopting a rod system unit method and numerical simulation, obtaining the optimal circular working well supporting structure composition, and then drawing to complete the design work of the functional requirements of the circular working well;
(II) the construction of the envelope open caisson of the round working well comprises the following concrete steps:
(1) preparation work before open caisson construction: the method comprises the steps of field leveling, paying off, first-layer earthwork excavation, substrate tamping, leveling and paying off, wire inspection, sand laying cushion, blade support formwork, steel bar binding, well body formwork, concrete pouring, maintenance and formwork removal;
(2) sinking the open caisson section by section: the method comprises sinking preparation, setting vertical transportation machinery and a drainage pump, observation, deviation correction, sinking to a designed elevation section by section and checking the elevation;
(3) in the process of casting the open caisson section by section, a thin-wall plain concrete cavity is arranged on a vertical axis of a preset jacking pipe door opening, and a sandwich concrete plate wall is inserted into the thin-wall plain concrete cavity;
(4) the enclosure structure of the circular working well is made of reinforced concrete or a steel member is used as a permanent structure of the circular working well, and anti-corrosion measures are taken;
(III) edge-facing protection construction: arranging an embedded part when the round working well enclosure structure is used for open caisson construction and pouring, and connecting the edge protection with the embedded part through bolts;
and (IV) excavating the earthwork of the circular working well: in the open caisson construction process, the earthwork of the overwater part is directly excavated, and the soil body of the underwater part is excavated by adopting a high-pressure water gun soil loosening, hydraulic grab bucket soil excavation or pump suction reverse circulation process;
(V) bottom sealing of the circular working well: in order to meet the requirement of subsequent construction, the circular working well is subjected to bottom sealing treatment by adopting concrete, floating resistance and stability are firstly treated by adopting plain concrete, and then the sunk well wall body is connected by adopting reinforced concrete;
and (VI) mounting a ladder entering the circular working well: designing a ladder according to the follow-up maintenance requirement, wherein the ladder is installed on the inner wall of the circular working well by adopting a bar planting process;
(VII) seam leakage treatment: carrying out leakage treatment on a bottom sealing joint of the circular working well and a joint of the side wall of the open caisson of the building envelope by adopting a high polymer material;
(eighth) installation of a hole water stop pressing plate: fixing a water stop pressing plate at the opening through an expansion bolt according to the position of a preset jacking pipe door opening;
(nine) lifting the top sandwich concrete slab wall of the preset pipe jacking door opening: lifting the sandwich concrete slab wall, forming a thin-wall plain concrete cavity at the position of the preset jacking pipe door opening, and reducing the resistance of the jacking pipe machine penetrating through the preset jacking pipe door opening;
(ten) jacking construction of jacking pipes: after the pipe jacking machine is installed in place, by means of hydraulic jacking force, the pipe jacking machine continuously penetrates through a thin-wall plain concrete cavity at a preset pipe jacking door opening part and then normal pipe jacking construction is carried out;
(eleven) related work implementation and acceptance such as pipeline communication and valve installation in the well: after all pipe jacking operations are finished, the pipe jacking machine is hoisted out, and relevant work implementation and acceptance such as pipeline communication, valve installation and the like in the permanent circular working well are started, so that the permanent circular working well can be used;
and (twelfth) dismantling the temporary protection, installing a top cover plate of the circular working well and the inspection well, and performing waterproof construction.
And meanwhile, the mechanical requirements of the two construction processes are considered, the stress and the structural function of the well digging support and the pipe jacking calculation construction are synchronously considered, and the conflict between the well digging support and the pipe jacking operation during later construction is avoided.
A permanent round working well with a pre-arranged pipe jacking door opening in a water-rich stratum comprises a round working well 1, wherein a building enclosure of the round working well 1 is a sunk well 4, the building enclosure is made of reinforced concrete generally, and when a steel member is used as a permanent structure of the round working well, anti-corrosion measures are required to be made in the water-rich stratum. The bottom of circular working well 1 is back cover 2, be close to bottom department in the circular working well 1 and be preset push pipe door opening 3, the position of presetting push pipe door opening 3 is the position that the push pipe is about to push in, be provided with thin wall plain concrete cavity 11 in the vertical axis of presetting push pipe door opening 3 in the caisson 4, sandwich concrete plate wall 5 has been inserted in thin wall plain concrete cavity 11, be provided with push pipe machinery 12 in the circular working well 1, it has push pipe 13 to be to having docked in push pipe machinery's 12 thrust direction, push pipe machinery 12 is promoting push pipe 13 and is advancing towards presetting push pipe door opening 3.
When the jacking pipe is pushed in, the sandwich concrete plate wall 5 is lifted, the thin-wall plain concrete cavity 11 at the position of the preset jacking pipe door opening 3 is penetrated by hydraulic jacking force, then the jacking pipe is pushed in, the sandwich concrete plate wall 5 is inserted into the thin-wall plain concrete cavity 11 in the open caisson, when the jacking pipe is not carried out, the sandwich concrete plate wall 5 is used as a part of a round working well enclosure structure, when the jacking pipe is needed, the sandwich concrete plate wall 5 is lifted, and under the action of the jacking force of a jacking pipe machine, the thin-wall plain concrete cavity 11 is easily penetrated, so that the working of the jacking pipe is facilitated. The existing working well is of a concrete structure, a water drill bit is not easy to open a door, the door opening needs to secondarily break a concrete surface layer, safety hazards such as collapse, subsidence and the like easily appear above the ground in the breaking process, after the sandwich concrete slab wall 5 is lifted, the thin wall of the thin-wall plain concrete cavity 11 is easily penetrated, jacking work of jacking pipes can be directly carried out, and secondary breaking is avoided.
The top of open caisson 4 is provided with top apron 14, is provided with inspection shaft 15 on the top apron 14, installs cat ladder 8 through the bar planting technology on 1 inner wall of circular working well, and cat ladder 8 is located 15 belows in the inspection shaft. After the pipe jacking construction is completed, the open caisson is covered with the top cover plate 14, an inspection well is arranged and used as a permanent working well, and the interior of the working well can be carried out through the inspection well and the ladder stand.
A water stop pressing plate 10 is fixed at the opening of the preset pipe jacking door opening 3 through expansion bolts, and the seam between the back cover 2 and the open caisson 4 and the seam on the side wall of the open caisson 4 are subjected to seam seepage treatment through a high polymer material 9, so that water seepage from the opening and the seam can be prevented particularly in a water-rich stratum after the permanent working well is used for a long time.
Connecting pieces are pre-buried in the open caisson 4, the upper end of the open caisson 4 is connected with an edge protector 6, the edge protector 6 is connected with the pre-buried connecting pieces through bolts, the edge protector is removed after construction is finished, and a cover plate at the top of the circular working well is covered.
The invention innovatively adopts a combined enclosing structure mode of a sunk well and a sandwich concrete plate wall at the position of a preset door opening to carry out advanced support of a circular working well, adopts construction process and structural design innovation, adopts hydraulic jacking force of pipe jacking equipment to directly penetrate through a thin-wall plain concrete cavity, realizes safe and rapid forming of the preset door opening so as to meet the subsequent construction requirement, save investment and accelerate construction progress, has the advantages of clear function, safety, rapidness, flexible design and the like of a permanent circular working well structural system of the preset pipe jacking door opening in a water-rich stratum, particularly overcomes the potential safety hazard of sudden water burst and sand burst in the process of penetrating the pipe jacking through a well wall in the water-rich stratum, provides a set of brand new working well design construction technology for non-excavation construction of underground pipelines of water conservancy, municipal administration, heating power, communication and the like in the water-rich stratum, not only changes the conventional construction method of the rear door opening and overcomes the risk of the rear door opening, the synchronous design of the preset door opening and the circular working well is innovatively provided and adopted, and when the hydraulic pressure type hydraulic pressure.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (6)
1. A construction method of a permanent circular working well with a pre-arranged jacking pipe door opening in a water-rich stratum is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the functional requirement design of the (first) round working well comprises:
(1) collecting related data, and determining the plane size and depth meeting the requirements of the operation in the well and the processing mode of the bottom sealing of the working well;
(2) determining the elevation and the diameter of a preset pipe jacking door opening according to the position, the diameter, the material and the connection mode of the proposed pipeline, wherein the number of the preset pipe jacking door openings is at least one;
(3) calculating and drawing the structure of the round working well: comparing, calculating and analyzing by adopting a rod system unit method and numerical simulation, obtaining the building envelope composition of the optimal circular working well, and then drawing to complete the design work of the functional requirements of the circular working well;
the building enclosure of the round working well is constructed by adopting an open caisson process, and the open caisson process construction comprises the following specific steps:
(1) preparation work before open caisson construction: the method comprises the steps of field leveling, paying off, first-layer earthwork excavation, substrate tamping, leveling and paying off, wire inspection, sand laying cushion, blade support formwork, steel bar binding, well body formwork, concrete pouring, maintenance and formwork removal;
(2) sinking the open caisson section by section: the method comprises sinking preparation, setting vertical transportation machinery and a drainage pump, observation, deviation correction, sinking to a designed elevation section by section and checking the elevation;
(3) in the process of casting the open caisson section by section, a thin-wall plain concrete cavity is arranged on a vertical axis of a preset jacking pipe door opening, and a sandwich concrete plate wall is inserted into the thin-wall plain concrete cavity;
(4) the material of the enclosure structure of the round working well adopts reinforced concrete;
(III) edge-facing protection construction: arranging an embedded part when the round working well enclosure structure is used for open caisson construction and pouring, and connecting the edge protection with the embedded part through bolts;
and (IV) excavating the earthwork of the circular working well: in the open caisson construction process, the earthwork of the overwater part is directly excavated, and the soil body of the underwater part is excavated by adopting a high-pressure water gun soil loosening, hydraulic grab bucket soil excavation or pump suction reverse circulation process;
(V) bottom sealing of the circular working well: in order to meet the requirement of subsequent construction, the circular working well is subjected to bottom sealing treatment by adopting concrete, floating resistance and stability are firstly treated by adopting plain concrete, and then the sunk well wall body is connected by adopting reinforced concrete;
and (VI) mounting a ladder entering the circular working well: designing a crawling ladder according to the follow-up maintenance requirement, wherein the crawling ladder is installed on the inner wall of the circular working well by adopting a bar planting process;
(VII) seam leakage treatment: carrying out leakage treatment on a bottom sealing joint of the circular working well and a joint of the side wall of the open caisson of the building envelope by adopting a high polymer material;
(eighth) installation of a hole water stop pressing plate: fixing a water stop pressing plate at the opening through an expansion bolt according to the position of a preset jacking pipe door opening;
(nine) lifting the top sandwich concrete slab wall of the preset pipe jacking door opening: lifting the sandwich concrete slab wall, forming a thin-wall plain concrete cavity at the position of the preset jacking pipe door opening, and reducing the resistance of the jacking pipe machine penetrating through the preset jacking pipe door opening;
(ten) jacking construction of jacking pipes: after the pipe jacking machine is installed in place, by means of hydraulic jacking force, the pipe jacking machine continuously penetrates through a thin-wall plain concrete cavity at a preset pipe jacking door opening part and then normal pipe jacking construction is carried out;
(eleven) pipeline communication in the well, and implementation and acceptance of relevant work of valve installation: after all pipe jacking operations are finished, the pipe jacking machine is hoisted out, and the permanent circular working well is started to be communicated with the pipeline and perform and check related work of valve installation;
and (twelve) dismantling the edge protection, installing a top cover plate of the circular working well and the inspection well and performing waterproof construction.
2. A permanent round working well with a pre-arranged pipe jacking door opening in a water-rich stratum is characterized in that: including circular working well (1), the envelope of circular working well (1) is open caisson (4), the bottom of circular working well (1) is back cover (2), be close to bottom department in circular working well (1) and be provided with thin wall plain concrete cavity (11) in open caisson (4) on the vertical axis of presetting open caisson door (3), it has sandwich concrete board wall (5) to insert in thin wall plain concrete cavity (11), the top of open caisson (4) is provided with top apron (14), be provided with inspection shaft (15) on top apron (14), install cat ladder (8) through the bar planting technology on circular working well (1) inner wall, cat ladder (8) are located inspection shaft (15) below.
3. The permanent circular working well with the preset top pipe door opening in the water-rich stratum as recited in claim 2, characterized in that: and a water stop pressing plate (10) is fixed at the opening of the preset jacking pipe door opening (3) through an expansion bolt.
4. The permanent circular working well with the preset top pipe door opening in the water-rich stratum as recited in claim 2, characterized in that: a pipe jacking machine (12) is arranged in the circular working well (1), a pipe jacking (13) is butted in the thrust direction of the pipe jacking machine (12), and the pipe jacking machine (12) pushes the pipe jacking (13) to push towards the preset pipe jacking door opening (3).
5. The permanent circular working well with the preset top pipe door opening in the water-rich stratum as recited in claim 2, characterized in that: and seam seepage treatment is carried out on the seam between the back cover (2) and the open caisson (4) and the seam on the side wall of the open caisson (4) through high polymer materials (9).
6. The permanent circular working well with the preset top pipe door opening in the water-rich stratum as recited in claim 2, characterized in that: connecting pieces are pre-buried on the open caisson (4), an edge protection part (6) is connected to the upper end of the open caisson (4), and the edge protection part (6) is connected with the pre-buried connecting pieces through bolts.
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| CN113668585A (en) * | 2021-09-03 | 2021-11-19 | 中建安装集团南京建设有限公司 | Open caisson structure for deep and large water intaking in high-pressure water area and construction method |
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