CN117166511A - Steel open caisson exploratory well method and exploratory well system - Google Patents
Steel open caisson exploratory well method and exploratory well system Download PDFInfo
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- CN117166511A CN117166511A CN202311190702.6A CN202311190702A CN117166511A CN 117166511 A CN117166511 A CN 117166511A CN 202311190702 A CN202311190702 A CN 202311190702A CN 117166511 A CN117166511 A CN 117166511A
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- open caisson
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 152
- 239000010959 steel Substances 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 230000002787 reinforcement Effects 0.000 claims abstract description 10
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 6
- 230000004888 barrier function Effects 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 238000009933 burial Methods 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000009412 basement excavation Methods 0.000 abstract description 5
- 206010013647 Drowning Diseases 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 7
- 239000010865 sewage Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000011202 physical detection method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Abstract
The invention discloses a steel open caisson exploring method and an exploring system, wherein the method comprises the steps of construction preparation and steel open caisson manufacturing by utilizing a steel plate transversely curled into 1/3 circular arc; step of sinking the steel open caisson in a ladder manner by utilizing the N sections of steel open caisson to finish the sinking step of the steel open caisson; completing pit bottom reinforcement by using an MJS jet grouting pile mode; recording and analyzing pipeline data; and recycling the steel open caisson by using a jack controlled by an oil pump. The steel open caisson exploring system comprises a plurality of sections of steel open caisson sections, wherein the steel open caisson sections are spliced to form a steel open caisson with the bottom sinking to the top of a pipeline to be explored; and the reinforcing barrier is formed by grouting arranged at the periphery of the steel open caisson. The invention can meet the detection of large-caliber pipelines, can improve the construction quality, can ensure the smooth progress of engineering, simultaneously ensures the public property safety and is beneficial to the cost control of engineering. Meanwhile, the method can avoid potential safety hazards such as water logging and drowning, soil collapse and the like caused by the conventional exploratory groove excavation.
Description
Technical Field
The invention relates to the technical field of municipal construction, in particular to a steel open caisson exploratory well method and an exploratory well system.
Background
With the gradual perfection of municipal infrastructure construction, many infrastructures have entered a maintenance period; at present, the sewage pipeline is used as the only discharge channel of urban industrial sewage and domestic sewage, maintenance is needed after long-time operation, and a horse riding well is often needed to be newly built above the pipeline when the large-diameter sewage pipeline is repaired, so that the effects of material delivery, personnel access and ventilation are achieved. Therefore, it is important to accurately determine the trend and the burial depth of the pipeline during construction.
Pipeline detection mainly comprises pipeline trend detection and pipeline burial depth detection, wherein the current pipeline detection method mainly comprises a physical detection method, and the pipeline detection method can be divided into two types, namely, metal pipelines and non-metal pipelines with metal mark lines are detected by utilizing an electromagnetic induction principle; the other type is that electromagnetic waves are utilized to detect underground pipelines of all materials, and the method can also be used for searching underground buried objects, commonly known as radars, and in addition, the conventional underground pipeline detection is also carried out by means of open-well investigation, exploratory trench excavation and the like.
Although the prior art is capable of probing a pipeline, the following deficiencies exist:
1. most of the traditional pipeline detection instruments are suitable for small-diameter pipelines, and large errors exist in data obtained by detecting large-diameter and deeper-buried pipelines, so that the practicability of the traditional pipeline detection instruments is limited to a certain extent when the large-diameter pipelines are detected. Secondly, underground conditions are complicated, and detection instruments are easily interfered by various factors to influence the pipeline detection accuracy.
2. Due to pipeline detection error construction, underground pipelines are damaged, economic property loss is caused, and meanwhile, engineering progress is limited.
3. When the exploring groove is adopted to excavate the detection pipeline, if the conditions of deeper pipeline burial depth, quicksand layer at the construction part and groundwater are met, the well pit water accumulation and drowning accident and soil collapse accident can be caused by no support and waterproof curtain at the periphery of the well pit, so that the greater potential safety hazard exists;
disclosure of Invention
The invention aims to provide a steel open caisson well exploring method which can efficiently, safely and accurately detect a large-diameter pipeline, and in the repairing process of the large-diameter pipeline, when a horse riding well is newly built above the pipeline, the steel open caisson exploring well not only can accurately detect the trend and the buried depth of the pipeline, but also can play a role in supporting and stopping water for the newly built horse riding well.
The invention further aims to provide a steel open caisson well exploratory well system, which can be rapidly put in a construction site to detect the trend of a pipeline, is convenient and efficient, and provides a guarantee for the safety of construction.
The invention provides a steel open caisson exploratory well method, which comprises the steps of construction preparation, and further comprises the following steps:
a step of manufacturing a steel open caisson by using a steel plate transversely curled into a 1/3 circular arc;
step of sinking the steel open caisson in a ladder manner by utilizing the N sections of steel open caisson to finish the sinking step of the steel open caisson;
completing pit bottom reinforcement by using an MJS jet grouting pile mode;
the method comprises the steps of pipeline data recording and analysis, wherein the connecting line direction of the contact point between the top of a pipeline and the bottom of an open caisson is the trend of a pipeline to be detected;
and recycling the steel open caisson by using a jack controlled by an oil pump.
In the method, the pipeline burial depth is a=b+d+2s;
wherein a is the burial depth of the pipeline;
b is the sinking depth of the steel open caisson;
d is the inner diameter of the pipeline;
s is twice the wall thickness of the pipeline;
the connecting line direction of the contact point between the pipe top and the bottom of the open caisson is the trend of the pipeline.
The width of the steel plate is the height of each section of steel open caisson, the width of the steel plate is 3m, and rib plates are uniformly arranged in each section of steel open caisson.
From the above, the method provided by the invention can meet the detection of the large-caliber pipeline, not only can improve the construction quality, but also can ensure the smooth progress of engineering, and simultaneously can ensure the public property safety and facilitate the cost control of engineering. Meanwhile, the method can avoid potential safety hazards such as water logging and drowning, soil collapse and the like caused by the conventional exploratory groove excavation. More importantly, in the repairing process of the large-diameter pipeline, when a horse riding well is newly built above the pipeline, the steel open caisson exploratory well not only can accurately detect the trend and the buried depth of the pipeline, but also can achieve good supporting and water stopping effects for the newly built horse riding well.
The invention provides a steel open caisson exploratory well system, which comprises:
the steel open caisson is arranged at the position of the well to be detected, the area of the open caisson is larger than the cross-sectional area of the steel open caisson, and the open caisson is provided with a section steel supporting system;
the steel open caisson sections are spliced to form a steel open caisson with the bottom sinking to the top of the pipeline to be detected;
and the reinforcing barrier is formed by grouting arranged at the periphery of the steel open caisson.
Further, a guide structure is arranged between adjacent steel open caisson sections.
From the above, the stability of the sinking process can be ensured by the structure of the steel open caisson, and the safety of the exploratory well and the accuracy of data can be ensured by the whole steel open caisson.
Drawings
FIG. 1 is a flow chart of a method for exploratory well detection of a steel open caisson in example 1 of the present invention.
FIG. 2 is a cross-sectional view of pit bottom reinforcement in example 1 of the present invention.
FIG. 3 is a schematic representation of the sinking of a first steel section of the open caisson according to example 1 of this invention.
FIG. 4 is a sinking schematic view of a second steel section of the open caisson according to example 1 of this invention.
FIG. 5 is a sinking schematic view of a third section of steel open caisson in example 1 of the present invention.
FIG. 6 is a schematic diagram of a steel open caisson well detection system according to example 2 of the present invention.
Detailed Description
The invention is further described in connection with the following embodiments in order to make the technical means, the creation features, the achievement of the purpose and the effect of the invention easy to understand.
The embodiment of the invention provides a steel open caisson exploratory well method, which comprises the steps of construction preparation, steel open caisson manufacturing, steel open caisson sinking, pit bottom reinforcement, pipeline data recording and analysis and steel open caisson recovery.
Referring to fig. 1, in the step of construction preparation, measurement and lofting are required to be carried out on a newly built riding well position according to coordinates provided by a construction drawing, and after a flag pole is marked, a construction area enclosure is manufactured. Secondly, cleaning the surface soil of the construction site and carrying out surface support on the open caisson, thereby reducing the sinking depth of the open caisson.
In the manufacturing step of the steel open caisson, each steel plate is transversely curled into 1/3 circular arc before welding, then each section of steel open caisson is formed by welding three circular arc steel plates, the width of each steel plate is the height of each section of steel open caisson, and the width of a common steel plate is 3m. And a certain number of rib plates are uniformly arranged in the steel open caisson. The number, specification and spacing of the concrete rib plates are calculated and determined according to the actual soil property condition of engineering and the action exerted by the steel open caisson.
In the sinking step of the steel open caisson, the steel open caisson cannot slowly sink depending on the self-weight due to the fact that the self-weight of the steel open caisson is light, and therefore the steel open caisson can slowly sink only under the assistance of an external load pair. When the excavator is used for taking soil, a steel plate with a certain thickness is paved on the top surface of the steel open caisson and used as a platform for the soil taking operation of the excavator. The first section of steel open caisson wall is sunk to a certain depth and then soil is taken out by utilizing the self-mass of the steel open caisson, the steel plate and the excavator. After the sinking of the first section of steel open caisson is completed, adding a second section of steel open caisson, simultaneously adding external load with a certain mass on an operating platform of the excavator, and the like, wherein four links of sinking, soil taking, lengthening of the steel open caisson and external load are coordinated until the steel open caisson is sunk to the elevation of the top of the sewer pipe. Taking three steel open caissons as an example, referring to fig. 3-5, a target pipeline M detected by a exploratory well is shown in the figure, the wall of a first steel open caisson P1 is sunk to a certain depth and then is taken out, after the sinking of the first steel open caisson is completed, a second steel open caisson P2 is added, meanwhile, an external load with a certain mass is added on an operating platform of the excavator, and the like, so that the sinking work of a third steel open caisson P3 is completed.
In addition, under the condition that the steel open caisson shaft is small, if an excavator soil taking operation platform is paved on the top surface of the steel open caisson shaft, soil taking of the excavator is difficult or even impossible, at this time, measures such as hanging external load in each section of the steel open caisson shaft to increase the whole mass of the steel open caisson shaft, pressing the top surface of the steel open caisson by an excavator bucket are generally adopted, so that the steel open caisson is slowly submerged, after the first section of the steel open caisson shaft is submerged, a second section of the steel open caisson shaft is increased, and simultaneously, hanging external load with certain mass in the second section of the steel open caisson shaft, and the four links of sinking, soil taking, lengthening the steel open caisson shaft and adding external load are cooperatively carried out until the steel open caisson is submerged to the top elevation of a sewer pipe.
In the sinking step of the steel sinking well, (1) detecting the sinking verticality and elevation of the steel sinking well at any time in the sinking process of the steel sinking well, and if inclination occurs in the sinking process, adjusting the position and the quality of an additional load to correct; (2) The surrounding geological conditions are firstly surveyed before the steel open caisson sinks, if a quicksand layer appears in geological exploration, a circle of soil body range of 1m around the steel open caisson can be reinforced by adopting double-liquid layered grouting, and dewatering is dredged in the excavation process; (3) In the sinking process of the steel open caisson, the deformation condition of the steel open caisson is concerned at a moment, and steel supports can be erected in the steel open caisson when necessary.
In the step of pit bottom reinforcement [ pit bottom (circumference of pipe) reinforcement ], after the steel open caisson is sunk to the elevation of the top of a sewage pipe to be detected, the pit bottom (circumference of pipe) needs to be reinforced, the pit bottom (circumference of pipe) reinforcement adopts an MJS jet grouting pile form, the MJS jet grouting pile used for the pipe bottom reinforcement is obliquely driven to a certain depth below the center of the pipe from the ground at two sides of a foundation pit in a crossing way, meanwhile, the MJS jet grouting pile is arranged in a staggered way, the pit bottom is ensured to be effectively overlapped, as shown in figure 2 (the drawing in the specification is not specially described, the dimension units are all mm), the figure shows a jet grouting pile 2 and a working hole position 1 for obliquely punching the jet grouting equipment to a preset position by 12 degrees, and the construction sequence is as follows: (1) Reinforcing an MJS rotary spray pile at the bottom of a foundation pit, and then constructing an MJS rotary spray irrigation pile injection waterproof curtain; (2) The minimum distance between the axis of the MJS jet grouting pile and the outer wall of a pipe is 0.5m, and when the pile is close to the construction of the pipe, the injection pressure and the swing-injection time are controlled.
In the step of pipeline data recording and analysis, after the steel open caisson is sunk to the elevation of the pipe top, the connecting line direction of the contact point between the pipe top and the bottom of the open caisson is the trend of a pipeline to be detected, and a worker accurately records the data of the type, pipe diameter, material, burial depth, trend and the like of the pipeline according to the detected pipeline condition and processes and analyzes the data so as to facilitate the further implementation of the subsequent construction process.
In the step of recovering the steel open caisson, the part affecting the lifting in the open caisson is eliminated before the steel open caisson is recovered, and then an oil pump control jack is adopted to lift the steel open caisson to the ground surface. Therefore, the technical key of the process for lifting the steel open caisson is the configuration and arrangement of the jacks, the configuration of the jacks with the specifications is determined through calculation according to the actual engineering conditions, and the jacks are required to be subjected to reinforcement treatment on the jack bases during arrangement, so that the compression resistance of the jack bases is increased.
When the force points of the jacks are arranged on the steel open caisson, the positions of the base of the jacks need to be referred to for the arrangement of the force points so as to ensure that the stress of all the jacks is uniform. When each section of steel open caisson is jacked up to a certain height, cutting is carried out at the original welding seam, and recycling is carried out section by section. And repeating the steps until the last section of steel open caisson is jacked up and taken out, and cleaning the weld residue and the surface of the steel open caisson after the steel open caisson is recovered so as to change the subsequent repeated use.
It should be noted that the steel open caisson utilizes the self-weight of open caisson and the external load applied on open caisson to make open caisson overcome the friction force of well wall and bottom end bearing resistance and sink to the elevation position of pipe top. At this time, the connecting line direction of the contact point between the pipe top and the bottom of the open caisson is the trend of the pipeline to be detected. The sinking depth (b) of the steel open caisson, plus the pipe diameter (d) and twice the pipe wall thickness(s), is equal to the pipe burial depth (a), so that the purpose of pipeline detection is achieved, and the formula is expressed as a=b+d+2s.
In the sinking process of the sinking well, the friction force between the well wall and the soil layer, the buoyancy of water and the counterforce of the stratum to the cutting edge are needed to be overcome. Before construction, design calculation is needed by combining the appearance, quality, sinking depth, hydrogeological conditions and the like of the open caisson, and related technical specifications can be referred.
In a second embodiment of the invention, a steel open caisson exploratory well system is provided, see fig. 6, which comprises a cutting groove Z1 arranged at the well to be exploratory well, wherein the cutting groove is a rectangular cutting groove, the area of the cutting groove is larger than the cross-sectional area of the steel open caisson, and the positions where the open caisson needs to be performed can be distributed at the central position of the cutting groove. The steel support system Z2 is arranged in the digging groove, so that the safety of operation and the convenience of field operation are improved, a steel open caisson Z3 is formed by the multi-section steel open caisson sections arranged at the position of the well to be detected, the steel open caisson sections are spliced to form a steel open caisson with the bottom sinking to the top of the pipeline to be detected, the sections can be connected in a welding mode, and the like, and then welded seams are cut in the later disassembly process. The number of concrete steel open caisson sections is selected according to the burial depth of the sewer line to be detected, e.g. steel open caisson dimensions: 1m is multiplied by 2.5m is multiplied by 4.5m, the wall thickness is 3cm, a 4.5m high steel open caisson is sunk in three sections, each section is 1.5m high, the steel open caisson section can not be limited by the site construction height, if a sewage pipeline is detected below an overhead, the steel open caisson section is extremely easy to be limited by the height of a viaduct, and the reason why the inventor selects a plurality of open caisson sections is that the reinforcing barrier Z4 around the steel open caisson is reinforced by grouting.
The dimensions given in fig. 6 are in millimeters unless otherwise specified. The figure shows that the digging groove Z1, the section steel supporting system Z2, the steel open caisson Z3 and the reinforcing barrier Z4 are formed by sinking and combining a plurality of sections of open caisson sections, the stability of the open caisson is higher, guide structures between the upper adjacent steel open caisson sections and the lower adjacent steel open caisson sections can be distributed, for example, guide mounting grooves are circumferentially distributed at the upper edge of the lower steel open caisson section of the adjacent steel open caisson sections, guide protrusions are circumferentially distributed at the lower edge of the upper steel open caisson section, the guide protrusions can enter the guide mounting grooves, the structure of the mutual guide not only can enable the adjacent steel open caisson sections to have good guide mounting effect when being mounted, and improves the efficiency and accuracy of the mutual installation.
For example, the device is utilized to ascertain a specific position of a DN3500 sewage pipeline (pipeline to be detected) before construction, and provides a position reference for a subsequent saddle well guard pile. When the traditional exploratory trench excavation detection pipeline encounters the conditions that the pipeline buries deeply, the construction part is provided with a quicksand layer and underground water, the well pit periphery is not supported and waterproof curtain can possibly cause water accumulation and drowning accidents and soil collapse accidents, the construction progress is affected slightly, and casualties occur heavily.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (5)
1. The steel open caisson exploratory well method comprises the steps of construction preparation and is characterized by further comprising the following steps:
a step of manufacturing a steel open caisson by using a steel plate transversely curled into a 1/3 circular arc;
step of sinking the steel open caisson in a ladder manner by utilizing the N sections of steel open caisson to finish the sinking step of the steel open caisson;
completing pit bottom reinforcement by using an MJS jet grouting pile mode;
the method comprises the steps of pipeline data recording and analysis, wherein the connecting line direction of the contact point between the top of a pipeline and the bottom of an open caisson is the trend of a pipeline to be detected;
and recycling the steel open caisson by using a jack controlled by an oil pump.
2. A method according to claim 1, wherein the pipe burial depth a = b + d +2s;
wherein a is the burial depth of the pipeline;
b is the sinking depth of the steel open caisson;
d is the inner diameter of the pipeline;
s is twice the wall thickness of the pipeline;
the connecting line direction of the contact point between the pipe top and the bottom of the open caisson is the trend of the pipeline.
3. The method according to claim 1, wherein the width of the steel plate is the height of each section of steel open caisson, the width of the steel plate is 3m, and rib plates are uniformly arranged in each section of steel open caisson.
4. A steel open caisson well detection system, characterized in that it comprises:
the steel open caisson is arranged at the position of the well to be detected, the area of the open caisson is larger than the cross-sectional area of the steel open caisson, and the open caisson is provided with a section steel supporting system;
the steel open caisson sections are spliced to form a steel open caisson with the bottom sinking to the top of the pipeline to be detected;
and the reinforcing barrier is formed by grouting arranged at the periphery of the steel open caisson.
5. The steel open caisson well system according to claim 4, wherein a guiding structure is provided between adjacent steel open caisson sections.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311190702.6A CN117166511A (en) | 2023-09-15 | 2023-09-15 | Steel open caisson exploratory well method and exploratory well system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311190702.6A CN117166511A (en) | 2023-09-15 | 2023-09-15 | Steel open caisson exploratory well method and exploratory well system |
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| Publication Number | Publication Date |
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| CN117166511A true CN117166511A (en) | 2023-12-05 |
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| CN202311190702.6A Pending CN117166511A (en) | 2023-09-15 | 2023-09-15 | Steel open caisson exploratory well method and exploratory well system |
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| Country | Link |
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| CN (1) | CN117166511A (en) |
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- 2023-09-15 CN CN202311190702.6A patent/CN117166511A/en active Pending
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