CN111485893A - Earth excavation construction method for pipe curtain channel with oversized cross section in saturated soft soil area - Google Patents
Earth excavation construction method for pipe curtain channel with oversized cross section in saturated soft soil area Download PDFInfo
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- CN111485893A CN111485893A CN201910958342.7A CN201910958342A CN111485893A CN 111485893 A CN111485893 A CN 111485893A CN 201910958342 A CN201910958342 A CN 201910958342A CN 111485893 A CN111485893 A CN 111485893A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/04—Driving tunnels or galleries through loose materials; Apparatus therefor not otherwise provided for
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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Abstract
The invention discloses a construction method for earthwork excavation of a pipe curtain channel with an oversized cross section in a saturated soft soil area, which comprises the following steps: s1, dividing the ultra-large section pipe curtain into a plurality of bins along the horizontal direction by using bin dividing pipes; s2, dividing each bin into a plurality of soil layers along the vertical direction; s3, excavating a plurality of soil layers between the bins from top to bottom according to a certain sequence, wherein in the soil layer excavating process, supporting frames used for supporting soil bodies are synchronously installed on the areas where the excavation is finished along the excavating direction, and the supporting frames in the adjacent soil layers are in one-to-one butt joint. The pipe curtain channel with the super-large cross section is divided into a plurality of small cross sections to be excavated one by one, the excavation face collapse and the soil body settlement can be avoided simultaneously in the process of excavating each small cross section, and finally the excavation face collapse and the soil body settlement can not occur in the whole pipe curtain channel with the super-large cross section.
Description
Technical Field
The invention relates to a construction method for earthwork excavation of a pipe curtain channel with an oversized cross section in a saturated soft soil area.
Background
With the increasingly rapid urbanization process, the population density is increasing, the land resource utilization rate tends to be saturated, and a series of problems such as traffic congestion and environmental deterioration become important factors which hinder the rapid development of cities. Therefore, the development and utilization of urban underground space become important research directions in the future. The problems of peripheral traffic detour, municipal pipeline relocation, green landscape destruction and the like caused by the traditional open cut method construction cannot meet the high standard requirements of modern cities on the construction of underground space projects in urban central areas with dense population and short land. The pipe curtain underground excavation method is a non-open excavation method, and is particularly suitable for passing through luxurious streets, overpasses or underpass structures with shallow soil covering, existing pipelines, surrounding buildings and other areas which need to be protected and are not suitable for open excavation and cover excavation by utilizing a small-caliber pipe jacking machine to build a large-section underground space, and is widely applied at home and abroad. However, the saturated soft soil area has the characteristics of higher underground water level, poorer water-resisting effect, obvious rheological plasticity of the stratum and the like, and the following problems can be caused when the earthwork excavation of the pipe-curtain channel with the oversized cross section is carried out in the area: 1) if the length of the excavation support is short in order to reduce soil body settlement, the slope of the excavated earthwork is large, and the excavated surface is easy to collapse; 2) if the slope of the excavated earthwork needs to be reduced and the length of the excavation without support needs to be prolonged in order to avoid the collapse of the excavated surface, the soil body is obviously settled and the surrounding environment is difficult to protect. Therefore, at present, no precedent for performing earth excavation of a pipe curtain channel with an oversized cross section in a saturated soft soil area exists at home and abroad, so that a construction method capable of solving the problems is urgently needed.
Disclosure of Invention
The invention aims to overcome the defect that the contradiction between excavation surface collapse and soil body settlement exists when the earth excavation of the pipe curtain channel with the oversized cross section is carried out in the saturated soft soil area in the prior art, and provides a construction method for the earth excavation of the pipe curtain channel with the oversized cross section in the saturated soft soil area, which can solve the contradiction.
The invention solves the technical problems through the following technical scheme:
a construction method for earthwork excavation of a pipe curtain channel with an oversized cross section in a saturated soft soil area is characterized by comprising the following steps:
s1, dividing the ultra-large section pipe curtain into a plurality of bins along the horizontal direction by using bin dividing pipes;
s2, dividing each bin into a plurality of soil layers along the vertical direction;
s3, excavating a plurality of soil layers between the bins from top to bottom according to a certain sequence, wherein in the soil layer excavating process, supporting frames used for supporting soil bodies are synchronously installed on the areas where the excavation is finished along the excavating direction, and the supporting frames in the adjacent soil layers are in one-to-one butt joint. After the lower-layer earthwork is excavated to a preset position, the local upper supporting frame is temporarily suspended and fails. At the moment, the supporting frame below is installed and fixed in time and is in butt joint with the supporting frame above in suspension.
Preferably, in step S3, the soil layer in the warehouse on one side is excavated, after the excavation distance reaches a certain design value, the soil layer on the same layer in the warehouse on the other side is excavated, and the excavation speeds of the soil layers on both sides are the same until all the soil layers on both sides are excavated.
Preferably, after the two adjacent bins on two sides of any bin are excavated, the bin dividing pipes on two sides are cut off and removed synchronously along the excavation direction in the process of excavating the middle bin.
Preferably, a diagonal rod and a tie beam are connected between adjacent support frames.
Preferably, after the soil layer below is excavated, the supporting frame above the local part is in a suspended state, and the supporting frame is installed and fixed in the area where excavation is completed and is in butt joint with the supporting frame above the supporting frame.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: the pipe curtain channel with the super-large cross section is divided into a plurality of small cross sections to be excavated one by one, the excavation face collapse and the soil body settlement can be avoided simultaneously in the process of excavating each small cross section, and finally the excavation face collapse and the soil body settlement can not occur in the whole pipe curtain channel with the super-large cross section.
Drawings
FIG. 1 is a schematic cross-sectional view of a tube sheet channel with a very large cross-section in a preferred embodiment of the invention.
Fig. 2 is a schematic diagram of the excavation of the soil layer above in the super large cross section pipe curtain passage in the preferred embodiment of the invention.
Fig. 3 is a schematic diagram of the simultaneous excavation of two side chambers in a super large cross-section pipe curtain passageway in a preferred embodiment of the invention.
Fig. 4 is a schematic view of the excavation of the soil layer below in the super large cross section pipe curtain passage in the preferred embodiment of the present invention.
FIG. 5 is a schematic illustration of the excavation of the intermediate bin in the oversized cross-section pipe curtain passageway in the preferred embodiment of the invention.
Fig. 6 is a schematic structural diagram of a pipe curtain channel with an oversized cross section after excavation is completed in the preferred embodiment of the invention.
Description of reference numerals:
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In order to enhance the protection of adjacent buildings, reduce the mutual influence of adjacent construction and ensure the smooth proceeding of earthwork excavation, support and structure back-building, a pipe curtain subsurface excavation construction method is adopted for a certain subway station in the Shanghai, but the Shanghai belongs to a saturated soft soil area, has poor geological conditions and obvious rheological plasticity of stratum, and when the pipe curtain channel earthwork excavation with an oversized section is carried out in the area, the following problems can be caused 1) if the excavation has short design without support length, large excavation earthwork gradient and easy collapse of an excavation surface, 2) if the excavation earthwork gradient is reduced and the excavation length without support is increased, the deformation of a soil body is larger, therefore, no precedent for carrying out the earthwork excavation of the pipe curtain channel with the oversized section in the saturated soft soil area at home and abroad is needed to be developed, related researches are urgently needed, the length of the pipe curtain section of the subway station is 100m, the burial depth is 5.4m, and the construction section is constructed by 21.99m (width) × 7.2.2 m (height), and the specific earthwork excavation construction:
s1, dividing the ultra-large section pipe curtain into a plurality of bins 100 along the horizontal direction by using bin dividing pipes 110;
s2, dividing each chamber 100 into a plurality of soil layers along the vertical direction;
s3, excavating a plurality of soil layers between the bins 100 from top to bottom according to a certain sequence, in the excavation process of each soil layer, synchronously installing supporting frames 200 for supporting soil bodies 400 in the excavated area along the excavation direction, and butting the supporting frames 200 in the adjacent soil layers one by one.
In this embodiment, as shown in fig. 1, a tube curtain is divided into three chambers 100 by a tube curtain and a bin dividing tube 110, and each chamber 100 is divided into an upper layer and a lower layer. Excavating the side bin first and then excavating the middle bin; excavating the upper soil layer firstly and then excavating the lower soil layer.
As shown in figure 2, when soil layers above are excavated, firstly, the excavating arms of the crawler rakes dig soil in front, the soil is conveyed to a rear transport vehicle through the crawler rakes conveying grooves, then, positions difficult to dig by the crawler rakes are cleaned manually, according to actual geological conditions, each soil layer can be firstly put on a slope at 45 degrees, when the tunnel face 300 is good in self-supporting performance, the slope angle can be increased, preferably 60-75 degrees, the single advancing ruler is excavated to be 2.5m, when the crawler rakes are excavated to a preset position, the crawler rakes are withdrawn, the supporting frames 200 are installed by a forklift to form a supporting frame system with the distance of 2.5m, the supporting frames 200 are formed by splicing 700 × H-shaped steel, two 500 × H-shaped steel are arranged in the middle for reinforcing, and in order to guarantee the supporting stability, the supporting frames 200 are connected by inclined rods 210(200 × channel steel) and tie beams 220(500 × H-shaped steel).
In order to improve the excavating efficiency and ensure the integral stability of the oversized-section pipe curtain, firstly, excavating the soil layer in the bin 100 on one side, excavating the soil layer on the same layer in the bin 100 on the other side after the excavating distance reaches a certain design value, and excavating the soil layers on the two sides at the same speed until the soil layers on the two sides are completely excavated. In the present embodiment, as shown in fig. 3, when the excavation distance of the soil layer above one side reaches 25m, excavation of the soil layer above the other side is started. And after the soil layers above the two sides are excavated, excavating the soil layers below the two sides. As shown in fig. 4, the earth layer located below is excavated in a manner similar to that of the earth layer located above. The single-time footage of excavation of the soil layer below is 2.5m, and when the slag raking machine is excavated to a preset position, the supporting frame 200 above the local part is temporarily suspended to lose efficacy. The supporting frame 200 at the lower part is fixedly installed by a forklift and is butted with the supporting frame 200 at the upper part in the air.
As shown in FIG. 5, the middle bunker earthwork excavation method is similar to that of the side bunker, and the principle of 'layered excavation and timely support' is also followed. In order to avoid the blocking of the bin dividing pipes 110 on the mutual butt joint of the supporting frames 200 in the adjacent bins 100, after the two bins 100 on the two sides of the middle bin are excavated, the bin dividing pipes 110 on the two sides are synchronously cut off and removed along the excavation direction in the process of excavating the middle bin. In other embodiments, the super-large section pipe curtain can be divided into more than four chambers, and in the process of excavating the chambers, adjacent chambers can be prevented from being excavated at the same time. Taking four chambers as an example, the excavation process is to excavate the first and third chambers first, and then the second and fourth chambers. When a second bin is excavated, the bin dividing pipes on two sides are cut off and removed synchronously; and when the fourth bin is excavated, synchronously cutting off and removing the bin dividing pipe between the third bin and the fourth bin. And so on.
The single-time footage of the middle warehouse excavation is 2.5m, wherein the distance between the supporting frames 200 is 2.5m, and the 6 supporting frames 200 positioned on the same section are spliced into a whole.
The pipe curtain channel with the super-large cross section is divided into 6 small cross sections to be excavated one by one, the excavation face collapse and the soil body settlement can be avoided simultaneously in the process of excavating each small cross section, and finally the excavation face collapse and the soil body settlement can not occur in the whole pipe curtain channel with the super-large cross section.
In order to facilitate the subsequent internal structure construction, after the earth of the pipe curtain channel is completely excavated, one group of the supporting frames 200 positioned in the same section is removed at intervals along the extending direction of the channel. As shown in fig. 6, finally, the support frames 200 form a support system with a pitch of 5 m.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (5)
1. A construction method for earthwork excavation of a pipe curtain channel with an oversized cross section in a saturated soft soil area is characterized by comprising the following steps:
s1, dividing the ultra-large section pipe curtain into a plurality of bins along the horizontal direction by using bin dividing pipes;
s2, dividing each bin into a plurality of soil layers along the vertical direction;
s3, excavating a plurality of soil layers between the bins from top to bottom according to a certain sequence, wherein in the soil layer excavating process, supporting frames used for supporting soil bodies are synchronously installed on the areas where the excavation is finished along the excavating direction, and the supporting frames in the adjacent soil layers are in one-to-one butt joint.
2. The method for excavating and constructing the soil through the pipe curtain channel with the oversized cross section in the saturated soft soil area according to claim 1, wherein in step S3, the soil layer in the chamber on one side is excavated, after the excavating and excavating distance reaches a certain design value, the soil layer in the same layer in the chamber on the other side is excavated, and the excavating speed of the soil layers on the two sides is the same until the soil layers on the two sides are completely excavated.
3. The method for earthwork excavation construction of a pipe curtain channel with an oversized cross section in a saturated soft soil area according to claim 1, wherein after excavation of two adjacent chambers at two sides of any chamber is completed, the branch pipes at two sides are synchronously cut off and removed along the excavation direction in the process of excavating the chamber in the middle.
4. The method for earthwork excavation construction of the pipe curtain channel with the ultra-large cross section in the saturated soft soil area according to claim 1, wherein an inclined rod and a tie beam are connected between the adjacent support frames.
5. The method for earthwork excavation construction of a pipe curtain channel with an oversized cross section in a saturated soft soil area as claimed in claim 4, wherein after excavation of the soil layer below, the supporting frame above the part is in a suspended state, and the supporting frame is installed and fixed to the area where excavation is completed and is in butt joint with the supporting frame above the suspended supporting frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910958342.7A CN111485893A (en) | 2019-10-10 | 2019-10-10 | Earth excavation construction method for pipe curtain channel with oversized cross section in saturated soft soil area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910958342.7A CN111485893A (en) | 2019-10-10 | 2019-10-10 | Earth excavation construction method for pipe curtain channel with oversized cross section in saturated soft soil area |
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