CN108677961B - Underground diaphragm wall foundation pit construction method and foundation pit excavation system - Google Patents
Underground diaphragm wall foundation pit construction method and foundation pit excavation system Download PDFInfo
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- CN108677961B CN108677961B CN201810619636.2A CN201810619636A CN108677961B CN 108677961 B CN108677961 B CN 108677961B CN 201810619636 A CN201810619636 A CN 201810619636A CN 108677961 B CN108677961 B CN 108677961B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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Abstract
The invention discloses a foundation pit construction method and a foundation pit excavation system for an underground diaphragm wall foundation, and relates to the field of foundation pit construction, wherein the method comprises the following steps: s1, arranging a high-pressure water pump outside the foundation pit, arranging slag discharge and water supply pipelines, arranging a slurry ship, installing a sand pump, erecting a construction platform in the foundation pit, installing a relay sand pump on the platform, arranging slag discharge and water supply pipelines at the bottom of the pit, and installing a slurry pump and a water jet gun; s2, outputting high-pressure water by using a water jet gun to cut and disperse soil bodies in the excavated foundation pit to form a mud-sand mixture; and S3, pumping the mixture to a sand pump arranged in the pit by a bottom slurry pump, conveying the mixture to a sand pump outside the pit by the sand pump in the pit, and finally outputting the mixture through a slag discharge pipeline by the sand pump outside the pit. According to the underground continuous wall foundation pit construction method, the water supply and slag discharge system is arranged, so that the environmental protection requirement of effectively controlling dust pollution in earthwork excavation is met, large-scale hoisting operation is avoided, and the construction risk is reduced.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a foundation pit construction method and a foundation pit excavation system for an underground diaphragm wall foundation.
Background
The underground continuous wall is a continuous reinforced concrete wall jointly built by using continuous unit groove sections built section by section in foundation engineering and is used as a structure for intercepting water, preventing seepage, bearing and retaining water.
Before the construction of the underground diaphragm wall, a basic foundation pit excavation procedure is required, and the conventional construction method comprises the steps of firstly excavating soil at the bottom of the foundation pit by using an excavator, loading the soil into a soil residue hopper, then hoisting the soil residue hopper by using an outer crawler crane of the foundation pit, transferring the soil residue out of the foundation pit for temporary storage, and then transporting the soil residue to a soil abandonment site by using an automobile on land. The construction method has the following defects:
1. before each layer of soil in the foundation pit is excavated, the soil in the pit needs to be subjected to layered pre-drainage and dewatering, so that the problems of large dust pollution, foundation pit collapse and the like caused by overdrying of the soil in the construction process are prevented;
2. when each layer of soil in the foundation pit is excavated, peripheral soil is excavated in a partition symmetry mode, then middle soil is excavated, and the middle soil is always higher than the peripheral soil, so that the construction operation range and the degree of freedom of a construction tool are influenced; on the other hand, the soil heap is difficult to be treated in an environment-friendly way, so that the environment is polluted;
3. because the method uses the crawler crane to lift the muck bucket to transfer the muck, the requirement of large-scale hoisting equipment is large, the unearthing efficiency is low, and the transport of muck automobiles is limited by urban traffic control and greatly influenced by climate, thereby not meeting the requirements of site construction.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a foundation pit construction method and a foundation pit excavation system for an underground diaphragm wall foundation, which can meet the relevant requirements of environmental protection and rapid construction under the condition that the land transportation of the slag soil in a central urban area is limited.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a foundation pit construction method for an underground diaphragm wall foundation comprises the following steps:
s1, arranging a high-pressure water pump outside the foundation pit, arranging slag discharge and water supply pipelines, arranging a slurry ship, installing a sand pump, erecting a transfer platform in the foundation pit, installing a relay sand pump on the transfer platform, arranging slag discharge and water supply pipelines at the bottom of the pit, and installing a slurry pump and a water jet gun;
s2, outputting high-pressure water by using a water jet gun to cut and disperse soil bodies in the excavated foundation pit to form a mud-sand mixture;
s3, pumping the mixture by a mud pump to a relay sand pump arranged in the pit, conveying the mixture to a sand pump outside the pit by the relay sand pump in the pit, and finally outputting the mixture by the sand pump outside the pit through a slag discharge pipeline.
On the basis of the technical scheme, in the step S2, the interior of the foundation pit is limited within a certain range to form a pot bottom shape for flushing, sucking and taking soil.
On the basis of the technical scheme, in the step S2, the areas except the area for the mud washing and sucking operation in the foundation pit are always dry.
On the basis of the above technical solution, before the step S1, the device operation is debugged.
On the basis of the technical scheme, in the step S3, the efficiency of punching the soil body by the high-pressure water jet gun is controlled to be matched with the slag discharge efficiency of the mud pump; the discharge capacity of the sand pump is controlled to be larger than the configuration capacity of the mud pump.
On the basis of the technical scheme, after the step S3, the slurry ship is used for circularly loading the slurry output by the slag discharge pipe.
The invention also provides a foundation pit excavation system used in the foundation pit construction method of the underground diaphragm wall foundation, which comprises the following steps:
the water supply system comprises a water pumping platform, a water supplementing pipeline, a high-pressure water pump, a high-pressure water jetting pipeline and a high-pressure water jetting gun which are sequentially connected, wherein the water pumping platform is arranged at the edge of a river channel, and the water jetting gun is arranged inside a foundation pit to be excavated;
the slag discharging system comprises a mud pump, a transfer platform, a sand pump and a mud ship which are sequentially connected through a slag discharging pipe.
On the basis of the technical scheme, the high-pressure water pump is arranged on the ground at the edge of the underground continuous wall foundation of the foundation pit to be excavated.
On the basis of the technical scheme, a transfer platform is further arranged on the underground diaphragm wall foundation, and a sand pump outside the foundation pit is arranged on the transfer platform.
Compared with the prior art, the invention has the advantages that:
(1) according to the construction method of the foundation pit of the underground diaphragm wall foundation, the water supply and slag discharge system is arranged, soil in the foundation pit is completely converted into a mud-sand mixture and then discharged out of the working surface through the pipeline, so that the environmental protection requirement of effectively controlling dust pollution in earthwork excavation is met, large-scale hoisting operation is avoided, and the construction risk is reduced.
(2) The construction method of the foundation pit of the underground diaphragm wall foundation does not need to carry out hoisting and stacking of the muck and transfer of muck vehicles, provides an effective way for solving the problems that land transportation of the muck in a central urban area is limited and the excavation construction progress of the foundation pit of the underground diaphragm wall foundation is seriously restricted, improves the construction efficiency, ensures the construction period and has positive economic and social benefits.
(3) The existing excavation construction of the deep and large foundation pit of the large underground diaphragm wall foundation has the problem of cross operation with lining construction, the soil body in most areas of the center of the foundation pit is higher than the lining construction operation surface by the traditional island excavation method of the deep and large foundation pit, the water in the soil body is easy to seep to the lining construction operation surface, and the dry and anhydrous state of the lining construction operation surface cannot be guaranteed. According to the underground diaphragm wall foundation pit construction method, as long as the calculation requirement of the foundation pit stability analysis can be met through the mode of flushing and sucking the mud, the mud surface can be lower than the lining construction operation surface through the mode of flushing and sucking the mud, the water cannot seep to the lining construction operation surface, the drying of the lining construction operation surface is guaranteed, and the problems are avoided.
Drawings
FIG. 1 is a plan layout view of an underground diaphragm wall foundation pit excavation system in an embodiment of the invention;
FIG. 2 is a view A-A of FIG. 1 in an embodiment of the present invention in an underground diaphragm wall foundation excavation system;
fig. 3 is a view B-B of fig. 1 of the underground diaphragm wall foundation pit excavation system according to the embodiment of the present invention.
In the figure: 1-a water pumping platform, 2-a water pumping pump, 3-a water supplementing pipeline, 4-a high-pressure water pump, 5-a high-pressure water jetting pipeline, 6-a high-pressure water jetting gun, 7-a slurry pump, 8-a first slag discharging pipeline, 9-a transfer platform, 10-a sand pump, 11-a second slag discharging pipeline and 12-a slurry ship.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the invention provides an excavation system for a foundation pit of an underground diaphragm wall foundation, which comprises a water supply system, wherein the water supply system comprises a water pumping platform 1, a water supplementing pipeline 3, a high-pressure water pump 4, a high-pressure water jetting pipeline 5 and a high-pressure water jetting gun 6 which are sequentially connected; the slag discharging system comprises a mud pump 7, a transfer platform 9, a sand pump 10 and a mud boat 12 which are sequentially connected through a slag discharging pipeline. During the installation, at river surface installation pumping platform 1, installation suction pump 2 on pumping platform 1 arranges moisturizing pipeline 3, connects high-pressure water pump 4, arranges that high-pressure jetting pipeline 5 extends to the foundation ditch in, inserts high-pressure squirt 6 at last, forms high-pressure water jetting system. The method comprises the steps of installing a slurry pump 7 in a foundation pit, arranging a slag discharge pipeline 8, arranging a transit platform 9, installing a sand pump 10 on the top of the transit platform 9, arranging a slag discharge pipeline 11, and finally connecting to a slurry ship 12 stopped on the river surface to form a hydraulic slag discharge system. After the two systems are checked and debugged, the water suction pump 2 is started to pump water from the river, river water is conveyed to the high-pressure water pump 4 through the pipeline 3 to be pressurized, high-pressure water is conveyed to the water jetting gun in the foundation pit through the pipeline 5, the water jetting gun outputs a high-pressure water column, soil in the foundation pit is cut and dispersed, and a muddy water mixture is formed. And (3) starting a mud pump 7 to pump and discharge the mud-water mixture, conveying the mud-water mixture to a sand pump 10 on a transfer platform 9 through a pipeline 8 for relay pressurization conveying, and then conveying the mud mixture to a mud boat 12 which stops at the river through a pipeline 11 to form a hydraulic slag discharge system. The slurry mixture carries a large amount of muck, so that the aim of excavating soil in the foundation pit is fulfilled.
The embodiment of the invention also provides a foundation pit construction method of the underground continuous wall foundation, which comprises the following steps:
s1, arranging a high-pressure water pump outside the foundation pit, arranging slag discharge and water supply pipelines, arranging a slurry ship, installing a sand pump, erecting a transfer platform in the foundation pit, installing a relay sand pump on the transfer platform, arranging slag discharge and water supply pipelines at the bottom of the pit, and installing a slurry pump and a water jet gun;
s2, outputting high-pressure water by using a water jet gun to cut and disperse soil bodies in the excavated foundation pit to form a mud-sand mixture; in the step, the interior of the foundation pit can be limited within a certain range to form a pot bottom shape for absorbing mud and taking soil, so that the effect of absorbing mud and taking soil is ensured, and sediment deposition is avoided; furthermore, the rest areas except the mud washing and sucking operation area in the foundation pit can be kept dry all the time, and extra pollution caused by mud formed by silt, dust and the like in construction is avoided.
S3, pumping the mixture by a mud pump to a relay sand pump arranged in the pit, conveying the mixture to a sand pump outside the pit by the relay sand pump in the pit, and finally outputting the mixture by the sand pump outside the pit through a slag discharge pipeline. Furthermore, the efficiency of the high-pressure water gun for punching soil is controlled to be matched with the slag discharge efficiency of the mud pump in the step; the discharge capacity of the sand pump is controlled to be larger than the configuration capacity of a mud pump, so that the construction period is shortened as much as possible while the requirements of slurry discharge and slag discharge in construction are met. The discharge capacity and pressure of the sand pump 10 are larger than the configuration capacity of the mud pump 7, the mud-water mixture can be conveyed to a mud boat 12 parked on the river, and the mud boat 12 is configured enough to ensure that mud is circularly loaded and transported, so that the continuous and uninterrupted transport of the muck and the water is ensured.
The method mainly aims at designing a deep and large foundation pit of an underground diaphragm wall foundation, wherein the foundation at the bottom of the foundation pit has a bearing capacity requirement, only hydraulic flushing and suction are simply adopted, water easily permeates to the foundation pit bottom soil layer, the foundation is soaked into a soft foundation and the foundation at the bottom of the foundation pit is disturbed, dry soil in the foundation pit is concentrated to a flushing and suction mud operation area by adopting an excavator, the formation of a small pot bottom shape in a certain range is limited, and a soil body in the foundation pit has a certain height to play a certain protection role in the disturbance of foundation soil at the bottom of the foundation pit before the underground diaphragm wall lining support is formed; and the two layers before the excavation to the bottom of the foundation pit are operated by adopting a dry method of the excavator, so that the phenomenon that moisture permeates into the basement to soak into the soft original foundation is avoided.
The underground continuous wall foundation pit applicable to the invention has large excavation depth and area, the stratum covers a clay layer, a sand gravel layer, a hard plastic clay layer and the like, the geological condition is very complex, a plurality of methods must be considered for comprehensive application, the method has targeted solution to different geological conditions, the clay layer or the hard plastic clay layer only adopts a hydraulic impact absorption method, the soil body is not easy to disperse, the comprehensive method can solve the problem that the soil with high strength, strong viscosity and good self-stability is difficult to flush and absorb, and the method comprises the steps of firstly digging and dumping the soil by the digging machine, then hydraulically dumping the soil to form the slurry, the pressure of the high-pressure water jet gun has no special requirement, so that energy can be saved, the problem of centralized soil taking of a large-area foundation pit is solved, and the problem that high-pressure water easily hurts people is also avoided.
Meanwhile, aiming at a deep and large foundation pit of an underground diaphragm wall foundation and a foundation at the bottom of the foundation pit, the foundation at the bottom of the foundation pit has bearing capacity requirements, the traditional method only adopts hydraulic flushing and absorption, water is easy to permeate into a foundation pit bottom soil layer, a soft foundation is soaked, and the foundation at the bottom of the foundation pit is disturbed, dry soil in the foundation pit is transported and concentrated to a flushing and absorbing mud operation area by adopting an excavator, the formation of a small pot bottom shape is limited in a certain range, and a soil body in the foundation pit has a certain height to play a certain protection role in the disturbance of foundation soil at the bottom of the foundation pit before the formation; and the two layers before the excavation to the bottom of the foundation pit are operated by adopting a dry method of the excavator, so that the phenomenon that moisture permeates into the basement to soak into the soft original foundation is avoided.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (7)
1. A foundation pit construction method for an underground diaphragm wall foundation is characterized by comprising the following steps:
s1, arranging a high-pressure water pump outside the foundation pit, arranging slag discharge and water supply pipelines, arranging a slurry ship, installing a sand pump, erecting a transfer platform in the foundation pit, installing a relay sand pump on the transfer platform, arranging slag discharge and water supply pipelines at the bottom of the pit, and installing a slurry pump and a water jet gun;
s2, outputting high-pressure water by using a water jet gun to cut and disperse soil bodies in the excavated foundation pit to form a mud-sand mixture;
s3, pumping the mixture by a mud pump to a relay sand pump arranged in the pit, conveying the mixture to a sand pump outside the pit by the relay sand pump in the pit, and finally outputting the mixture by the sand pump outside the pit through a slag discharge pipeline;
in the step S2, the interior of the foundation pit is limited within a certain range to form a pot bottom shape for flushing, sucking and taking soil, so that the mud surface is lower than the lining construction operation surface;
in the step S2, the remaining areas in the foundation pit except the area for the mud washing and sucking operation are always dry;
and the soil in the step S2 is transported and concentrated to the soil washing and sucking operation area in the rest areas in the foundation pit through an excavator.
2. The underground continuous wall foundation pit construction method as claimed in claim 1, wherein: before the step S1, the device operation is debugged.
3. The underground continuous wall foundation pit construction method as claimed in claim 1, wherein: in the step S3, the efficiency of punching the soil body by the high-pressure water jet gun is controlled to be matched with the slag discharge efficiency of the mud pump; the discharge capacity of the sand pump is controlled to be larger than the configuration capacity of the mud pump.
4. The underground continuous wall foundation pit construction method as claimed in claim 1, wherein: and after the step S3, circularly loading and transporting the slurry output by the slag discharge pipe by using a slurry ship.
5. A pit excavation system used in the underground diaphragm wall foundation pit construction method as set forth in claim 1, comprising:
the water supply system comprises a water pumping platform, a water supplementing pipeline, a high-pressure water pump, a high-pressure water jetting pipeline and a high-pressure water jetting gun which are sequentially connected, wherein the water pumping platform is arranged at the edge of a river channel, and the water jetting gun is arranged inside a foundation pit to be excavated;
the slag discharging system comprises a mud pump, a transfer platform, a sand pump and a mud ship which are sequentially connected through a slag discharging pipe.
6. The excavation system of claim 5, comprising: and the high-pressure water pump is arranged on the ground at the edge of the underground diaphragm wall foundation of the foundation pit to be excavated.
7. The excavation system of claim 5, comprising: still be equipped with the transfer platform on the underground continuous wall basis, the grit pump outside the foundation ditch is located on the transfer platform on the underground continuous wall basis.
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| CN201810619636.2A CN108677961B (en) | 2018-06-13 | 2018-06-13 | Underground diaphragm wall foundation pit construction method and foundation pit excavation system |
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| CN201810619636.2A CN108677961B (en) | 2018-06-13 | 2018-06-13 | Underground diaphragm wall foundation pit construction method and foundation pit excavation system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2849822B2 (en) * | 1989-04-25 | 1999-01-27 | 西松建設株式会社 | Underground diaphragm wall excavation method and its equipment |
| CN102817387A (en) * | 2012-08-10 | 2012-12-12 | 中铁大桥局集团第六工程有限公司 | Water circulation system |
| CN105672388A (en) * | 2014-10-12 | 2016-06-15 | 童玉兰 | Dredged sediment adding mixing machine for building engineering filling and construction method of machine |
| CN107460881A (en) * | 2016-06-02 | 2017-12-12 | 宜兴市周铁镇生力钻探机械厂 | A kind of subgrade water jetting earth excavation construction technology |
-
2018
- 2018-06-13 CN CN201810619636.2A patent/CN108677961B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2849822B2 (en) * | 1989-04-25 | 1999-01-27 | 西松建設株式会社 | Underground diaphragm wall excavation method and its equipment |
| CN102817387A (en) * | 2012-08-10 | 2012-12-12 | 中铁大桥局集团第六工程有限公司 | Water circulation system |
| CN105672388A (en) * | 2014-10-12 | 2016-06-15 | 童玉兰 | Dredged sediment adding mixing machine for building engineering filling and construction method of machine |
| CN107460881A (en) * | 2016-06-02 | 2017-12-12 | 宜兴市周铁镇生力钻探机械厂 | A kind of subgrade water jetting earth excavation construction technology |
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