CN219527711U - Combined open caisson suitable for extremely soft rock - Google Patents
Combined open caisson suitable for extremely soft rock Download PDFInfo
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- CN219527711U CN219527711U CN202320763517.0U CN202320763517U CN219527711U CN 219527711 U CN219527711 U CN 219527711U CN 202320763517 U CN202320763517 U CN 202320763517U CN 219527711 U CN219527711 U CN 219527711U
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Abstract
The utility model discloses a combined open caisson suitable for extremely soft rock, which comprises an open caisson main body, wherein the bottom of a side wall is provided with a lower inverted wall extending to the bottom plate of the open caisson main body, and the top of the side wall is provided with an upper inverted wall extending to the ground; a drain pipe is arranged between the upper inverted wall and the open caisson main body; an inspection well is arranged in the open caisson main body, an inspection well shaft extending to the ground is arranged at the top of the inspection well, and a well cover is arranged at the top of the inspection well shaft; the pipe jacking pipelines extending to the inspection well are respectively arranged on two sides of the lower inverted wall, and are communicated with the inspection well. The utility model has small working surface and strong structural integrity during construction, adopts a structural mode that the top and the bottom of the open caisson main body are respectively provided with the upper part and the lower part of the open caisson main body to hang down, can avoid the risk that the open caisson main body is blocked in a rock stratum in the sinking period, and reduces the workload of rock breaking; thereby effectively reducing the risk coefficient during construction.
Description
Technical Field
The utility model relates to the technical field of municipal pipe networks, in particular to a combined open caisson suitable for extremely soft rock.
Background
At present, the open caisson process adopted in the rock has a plurality of difficulties.
Firstly, rock is difficult to break, construction can be performed by adopting modes such as pneumatic pick, machinery, blasting and the like, and the construction speed is low; secondly, in the rock stratum breaking process, the breaking unevenness can cause the open caisson to incline greatly in the sinking process, so that the open caisson is obliquely clamped in the rock stratum.
According to the on-site observation and characterization, the hardness degree of the rock is divided into: hard rock, soft rock, very soft rock.
The Chinese patent document CN217325444U discloses a combined open caisson suitable for rocks, which is mainly suitable for hard rocks, the side walls of the rocks cannot be weathered and collapse in the construction excavation process, and the construction mode is normal, namely the side walls are excavated to the bottom of a well and then are made.
The extremely soft rock mainly refers to rock with mineral components mainly including clay, carbon, sericite, hydromica, a mud interlayer, mud siltstone and the like, and the ultimate compressive strength is less than 5MPa. The physical characteristics of the composite material are low in strength, poor in cementing degree, large in porosity, easy to weather in a very short time after exposure, easy to mud when meeting water and the like. Meanwhile, the excavation construction difficulty of the extremely soft rock is high, and large-area weathering falling and collapse easily occur in the excavation construction process, so that great potential safety hazards are brought to the excavation construction.
Therefore, how to improve the overall strength of the open caisson, so that the open caisson can avoid the open caisson from being blocked in rock stratum and reduce the workload of rock breaking when facing to construction of extremely soft rock, and effectively control the risk of engineering, has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present utility model aims to provide a combined open caisson suitable for extremely soft rock, so as to avoid the risk of the open caisson being blocked in the rock stratum during the sinking period, reduce the workload of rock breaking, realize effective control of engineering risk and increase the construction safety.
In order to achieve the technical aim, the utility model provides a combined open caisson suitable for extremely soft rock, which comprises an open caisson main body, wherein the bottom of a side wall is provided with a lower inverted wall extending to the bottom plate of the open caisson main body, and the top of the side wall is provided with an upper inverted wall extending to the ground;
a drain pipe is arranged between the upper inverted wall and the open caisson main body;
an inspection well is arranged in the open caisson main body, an inspection well shaft extending to the ground is arranged at the top of the inspection well, and a well cover is arranged at the top of the inspection well shaft;
the pipe jacking pipelines extending to the inspection well are respectively arranged on two sides of the lower inverted wall, and are communicated with the inspection well.
Preferably, the top of the upper inverted wall is provided with a ring beam.
Preferably, a well ring is arranged between the top of the inspection well shaft and the well cover.
Preferably, a blade foot is arranged at the bottom of the side wall of the open caisson main body, and blade foot angle steel is arranged on the blade foot.
Preferably, a water stop strip is arranged between the open caisson main body and the lower part hanging wall.
Preferably, a sealing material is arranged at the gap between the pipe jacking pipeline and the inspection well connection area.
The utility model has the beneficial effects that:
due to the structural design, the utility model has the advantages of small working surface and strong structural integrity during construction. The structural mode that the upper inverted wall hanging and the lower inverted wall hanging are respectively arranged at the top and the bottom of the open caisson main body can avoid the risk that the open caisson main body is blocked in a rock stratum in the sinking period, and meanwhile, the workload of rock breaking is reduced; therefore, the risk coefficient during construction is effectively reduced, and the safety during construction is improved.
The utility model is suitable for extremely soft rock, when the construction is excavated, the large-area weathering falling off and collapse can easily occur when the exposure time of the foundation pit is slightly long, the reverse construction method is needed, namely, the excavation of a layer of protective arm can ensure that the side wall can not be weathered and collapsed, and the inverted wall has larger rigidity than the lining in the prior art, thereby ensuring the stability of the supporting structure.
The reverse construction method has the advantages that the reverse construction method is high in wall hanging strength and high in rigidity, the excavation depth of the extremely soft rock can be accurately controlled, and the reverse wall hanging construction can be immediately carried out after the rock excavation is finished, so that the risk of weathering and falling off of the extremely soft rock after long-time exposure is effectively controlled, and meanwhile the safety of constructors is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model in elevation;
FIG. 2 is a schematic top view of the present utility model;
FIG. 3 is a schematic view of the structure of the blade foot part of the open caisson body according to the present utility model;
fig. 4 is a schematic diagram of the connection of a pipe-in-pipe and an inspection well according to the present utility model.
In the figure: 1 a sunk well main body, 2 a lower inverted wall, 3 a pipe jacking pipeline, 4 a water stop bar, 5 an upper inverted wall, 6 rings of beams, 7 a drain pipe, 8 an inspection well, 9 an inspection well shaft, 10 rings of wells, 11 well covers, 12 fences, 13 angle steels, 14 moulding bed, 15 soil layers, 16 extremely soft rock layers, 17 sand and stone layers, 18 plain concrete layers and 19 sealing materials.
Detailed Description
The conception, specific structure, and technical effects of the present utility model will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present utility model.
Examples:
as shown in fig. 1-4, the combined open caisson suitable for extremely soft rock comprises an open caisson main body 1, wherein the bottom of a side wall is provided with a lower inverted wall 2 extending to the bottom plate of the open caisson main body 1, and the top of the side wall is provided with an upper inverted wall 5 extending to the ground;
a drain pipe 7 is arranged between the upper inverted wall 5 and the open caisson main body 1;
an inspection well 8 is arranged in the open caisson main body 1, an inspection well shaft 9 extending to the ground is arranged at the top of the inspection well 8, and a well cover 11 is arranged at the top of the inspection well shaft 9;
the two sides of the lower inverted wall 2 are respectively provided with a pipe jacking pipeline 3 extending to the inspection well 8 in a penetrating way, and the pipe jacking pipeline 3 is communicated with the inspection well 8.
The main innovation of the utility model is that: the top and the bottom of the open caisson body 1 are respectively provided with the upper inverted wall 5 and the lower inverted wall 2, namely, the structural mode of adopting the upper sinking and the lower hanging is adopted, so that the risk that the open caisson body is blocked in a rock stratum in the sinking period can be avoided, and meanwhile, the work load of rock breaking is reduced.
In this embodiment, after the open caisson body 1 is sunk to the designed elevation, an upper inverted wall 5 of brick construction is provided above the side wall of the open caisson body 1, a ring beam 6 is provided above the upper inverted wall 5, and a drain pipe 7 is provided between the upper inverted wall 5 and the open caisson body 1.
More specifically, in order to enhance the rigidity and the impermeability of the lower inverted wall 2 and improve the shear strength of the side wall of the lower inverted wall 2, a local bulge is arranged in front of the side wall of the lower inverted wall 2, and a hole is reserved at the position of the pipe jacking pipeline 3.
Further, the ring beam 6 provided on top of the upper inverted wall 5 can increase the integrity of the upper inverted wall 5, and at the same time, improve the tensile and shear strength of the upper inverted wall 5.
A well collar 10 is provided between the top of the manhole shaft 9 and the well cover 11 to enhance the integrity and strength of the manhole shaft 9.
The bottom of the side wall of the open caisson body 1 is provided with a cutting edge, the cutting edge is provided with a cutting edge angle steel 13, and the cutting edge angle steel 13 adopts Q235 angle steel, which has the function of avoiding the cutting edge from being damaged in the sinking process.
A water stop strip 4 is arranged between the open caisson body 1 and the lower inverted wall 2, a placing groove of the water stop strip 4 needs to be reserved in the cast-in-situ open caisson body 1 before installation, and the water stop strip 4 needs to be prevented from being polluted by water or other chemical substances in the pasting and installation process.
Sealing material 19 is arranged at the gap of the joint area of the pipe jacking pipeline 3 and the inspection well 8.
The construction steps of the utility model are as follows:
step one: firstly, the position and the size of the open caisson main body 1 are detected by geophysical prospecting, and whether a current pipeline exists below a construction area is confirmed; if the current pipeline exists, the construction can be performed after the pipeline is changed; around the open caisson body 1 is provided a construction fence 12.
Step two: the open caisson main body 1 is constructed, firstly, a cutting edge is poured, and a plain concrete cushion layer 18 and a brick moulding bed 14 with 500-thickness sand cushion layers 17 and C20 are sequentially arranged at the lower part of the cutting edge; before the blade feet are poured, the blade foot angle steel 13 and the steel bars are pre-buried, and finally the blade feet and the open caisson main body 1 are poured; the brick molding bed 14 is formed by adopting non-clay solid bricks and cement mortar in a bricklaying way, and is removed before the sinking of the open caisson body 1, so as to prevent the sinking or tilting of the open caisson body 1 in the pouring process.
Step three: when the open caisson body 1 is sunk to the top of the extremely soft rock stratum 16 from the soil layer 15, constructing an upper inverted wall 5, a ring beam 6 and a drain pipe 7; and then backfilling soil body behind the upper inverted wall 5, thereby reducing the construction operation area.
Step four: the rock is broken by adopting construction modes such as pneumatic pick, machinery, blasting and the like, and 30-50 cm thick rock is reserved from the inner side wall of the cutting edge to the outer edge of the open caisson body 1 in the rock breaking process, so that the open caisson body 1 is prevented from tilting when the rock is broken; the construction steps of the lower inverted wall 2 are as follows: cleaning the surface of the extremely soft rock stratum 16, positioning the edge line of the lower inverted wall 2, excavating a first well core to 1m below the top surface, taking the pit wall of the excavated extremely soft rock stratum 16 as a support, spraying 50mm thick C20 concrete on the surface of the extremely soft rock stratum 16, arranging a water-swelling rubber water stop strip 4 between the cutting edge of the open caisson main body 1 and the lower inverted wall 2, pouring a top ring beam of the lower inverted wall 2, secondarily measuring elevation and well position cross axis on the side wall of the lower inverted wall 2, excavating a second well core extremely soft rock stratum 16 (sectional jump-excavation), pouring a second concrete lower inverted wall 2 protective wall, repeating all the procedures of the second section until the bottom elevation of the lower inverted wall 2 is equal to the plain concrete bottom sealing to form the bottom plate of the open caisson main body 1; the wall thickness of the lower inverted wall 2 is 350-500 mm.
Step five: carrying out the operation of jacking pipe 3 in the well, jacking or receiving jacking pipe 3; after the operation of the pipe jacking pipeline 3 is completed, the inspection well 8 is poured, and the pipe jacking pipeline 3 and the inspection well 8 are sealed by adopting a sealing material 19, wherein the sealing material 19 consists of asbestos cement on the inner side and outside double-component polysulfide sealant.
Step six: and finally, after the construction of the inspection well 8 is finished, backfilling a gap between the open caisson main body 1 and the inspection well 8, backfilling the bottom plate of the lower inverted wall hanging 2 to the 500mm range on the well cover 11 by adopting graded sand stone, wherein the backfilling compaction coefficient is not less than 0.94, and when the backfilling compaction coefficient is positioned in the road range: the backfill material from 500 to the ground on the well cover 11 meets the road requirement, and the backfill compaction coefficient is more than or equal to 0.97.
In some embodiments, taking the construction of a sewage pipe network reconstruction project of a certain street in the city of combined fertilizer as an example, the bearing layer of the pipe-jacking pipeline 3 is positioned on middle weathered argillite sandstone (extremely soft rock layer 16). Firstly pouring a sunk well main body 1, sinking the sunk well main body 1 to the top of an extremely soft rock stratum 16, cleaning the surface of the extremely soft rock stratum 16, then adopting a pneumatic pick to break the extremely soft rock stratum 16, reserving rock with the thickness of 500mm from the inner side wall of a cutting edge to the outer edge of a lower inverted wall 2 in the process of breaking the extremely soft rock stratum 16, taking the rock pit wall which is obtained by sinking as a support, and spraying C20 concrete with the thickness of 50mm on the surface of the extremely soft rock stratum 16. Pouring a lower inverted wall 2, wherein the lower inverted wall 2 is used as a working well or a receiving well of the pipe jacking pipeline 3, and the wall thickness of the lower inverted wall 2 is 350mm. And finally, constructing the pipe-jacking pipeline 3, wherein the pipe-jacking pipeline 3 adopts a rock pipe-jacking machine, and after the construction of the pipe-jacking pipeline 3 is finished, constructing an inspection well 8, backfilling a foundation pit and recovering the pavement.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (6)
1. Combined open caisson suitable for extremely soft rock, including open caisson main part, its characterized in that: the bottom of the side wall of the open caisson body is provided with a lower inverted wall extending to the bottom plate of the open caisson body, and the top of the side wall is provided with an upper inverted wall extending to the ground;
a drain pipe is arranged between the upper inverted wall and the open caisson main body;
an inspection well is arranged in the open caisson main body, an inspection well shaft extending to the ground is arranged at the top of the inspection well, and a well cover is arranged at the top of the inspection well shaft;
the pipe jacking pipelines extending to the inspection well are respectively arranged on two sides of the lower inverted wall, and are communicated with the inspection well.
2. A combination open caisson suitable for use with ultra-soft rock according to claim 1, characterized in that: the top of the upper inverted wall is provided with a ring beam.
3. A combination open caisson suitable for use with ultra-soft rock according to claim 2, characterized in that: a well ring is arranged between the top of the inspection well shaft and the well cover.
4. A combination open caisson suitable for use with ultra-soft rock according to claim 2 or 3, characterized in that: the bottom of the side wall of the open caisson main body is provided with a cutting edge, and the cutting edge is provided with a cutting edge angle steel.
5. The combination open caisson adapted for use with ultra-soft rock according to claim 4, wherein: a water stop strip is arranged between the open caisson main body and the lower inverted wall.
6. The combination open caisson adapted for use with ultra-soft rock according to claim 5, wherein: sealing materials are arranged at the gap of the joint area of the pipe jacking pipeline and the inspection well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320763517.0U CN219527711U (en) | 2023-04-10 | 2023-04-10 | Combined open caisson suitable for extremely soft rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320763517.0U CN219527711U (en) | 2023-04-10 | 2023-04-10 | Combined open caisson suitable for extremely soft rock |
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| Publication Number | Publication Date |
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| CN219527711U true CN219527711U (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320763517.0U Active CN219527711U (en) | 2023-04-10 | 2023-04-10 | Combined open caisson suitable for extremely soft rock |
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| CN (1) | CN219527711U (en) |
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- 2023-04-10 CN CN202320763517.0U patent/CN219527711U/en active Active
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