CN110820783A - Soft soil area bin-type mud-water balance open caisson underground space system - Google Patents
Soft soil area bin-type mud-water balance open caisson underground space system Download PDFInfo
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- CN110820783A CN110820783A CN201911107499.5A CN201911107499A CN110820783A CN 110820783 A CN110820783 A CN 110820783A CN 201911107499 A CN201911107499 A CN 201911107499A CN 110820783 A CN110820783 A CN 110820783A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000002689 soil Substances 0.000 title claims abstract description 42
- 238000007865 diluting Methods 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 49
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 31
- 238000000034 method Methods 0.000 abstract description 29
- 230000008569 process Effects 0.000 abstract description 15
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 12
- 238000009412 basement excavation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000007306 turnover Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
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Abstract
The invention belongs to the technical field of building underground spaces, and particularly provides a soft soil area bin-type mud-water balance open caisson underground space system which can be applied to large building basements, municipal foundation engineering, underground stations and the like and comprises an open caisson structure, wherein the open caisson structure comprises a plurality of horizontally-arranged block underground structures, and two adjacent block underground structures are hermetically connected through a post-cast strip; and the bottom end of each block underground structure is provided with a water inlet and outlet balancing module, and the water inlet and outlet balancing module is used for diluting the land below the open caisson structure by high-pressure water to obtain muddy water and soil solution and then pumping out the muddy water and the soil solution together. And carrying out mud-water balance open caisson construction on each block, and sinking each section of open caisson section by using a mud-water balance method. The sinking speed of the open caisson can be adjusted at any time in the sinking process, and the trenchless automatic construction is realized. The method has the characteristics of small influence on the environment, high construction speed and high construction safety, and has certain advantage in economical efficiency.
Description
Technical Field
The invention belongs to the technical field of municipal foundation pit engineering, and particularly relates to a bin-type mud-water balance open caisson underground space system for a soft soil area.
Background
When the urban underground space in the soft soil area is constructed, the construction is generally carried out by adopting a clear (cover) excavation method and a clear (cover) excavation reverse method. For the open excavation smoothing method, an inner support needs to be constructed in an underground space foundation pit, and structures such as each laminate and a wall are poured from bottom to top after the foundation pit is excavated to the bottom. For the open cut reverse construction method, structures such as each floor wall and the like need to be constructed while soil bodies are excavated from top to bottom. Both the two construction methods need to construct a building envelope around the underground space, and large-area manual excavation is needed, so that the automation degree of construction is not high.
Disclosure of Invention
The invention aims to solve the problem of rapid and automatic construction in the process of building urban underground space in the prior art.
Therefore, the invention provides a soft soil area bin-type mud-water balance open caisson underground space system, which comprises an open caisson structure and a locking device, wherein the locking device comprises a lifting arm which is detachably connected with the open caisson structure;
the open caisson structure comprises a plurality of horizontally arranged partitioned underground structures, and two adjacent partitioned underground structures are in sealing connection through a post-cast strip;
and the bottom end of each block underground structure is provided with a water inlet and outlet balancing module, and the water inlet and outlet balancing modules are used for diluting the land below the open caisson structure by high-pressure water to obtain muddy water and soil liquid and then pumping out the muddy water and the soil liquid together.
Preferably, the water inlet and outlet balancing module comprises a first pressure source and a second pressure source, a plurality of independent liquid inlet channels and liquid outlet channels which are communicated up and down are arranged in the partitioned underground structure, the liquid inlet channels are communicated with the first pressure source, and the liquid outlet channels are communicated with the second pressure source.
Preferably, the underground space is combined with the post-cast strip and/or the anti-seismic seam of the main body structure and is divided into a plurality of small blocks, and the interval size of each small block is the space size of the block underground structure.
Preferably, the hoisting mechanism comprises a steel strand, a counter-force support, a directional slider and a winch, the counter-force support is fixed on two sides of the open caisson structure, a directional pulley is arranged on the counter-force support, one end of the steel strand is connected with the winch, and the other end of the steel strand is detachably connected with the open caisson structure after bypassing the directional pulley.
Preferably, the hoisting mechanism further comprises an automatic locking unit, an angular velocity sensor is arranged on a rotating shaft of the winch, and the angular velocity sensor is connected with the automatic locking unit.
Preferably, the blocking underground structure comprises at least one vertically arranged open caisson section, the open caisson section comprises a cutting edge foot section, a bottom plate section, a middle plate section and a top plate section which are sequentially connected in a sealing manner from bottom to top, and the bottom end of the cutting edge foot section, the bottom end of the bottom plate section, the bottom end of the middle plate section and the bottom end of the top plate section are communicated through a water inlet and outlet balance module.
Preferably, the side surfaces of two adjacent blocked underground structures in the horizontal direction are provided with blocking steel plates.
Preferably, the bottom end of the block underground structure is provided with a balancing weight.
The invention has the beneficial effects that: the invention provides a soft soil area bin-type mud-water balance open caisson underground space system which comprises an open caisson structure and a locking device, wherein the locking device comprises a lifting arm, the lifting arm is detachably connected with the open caisson structure, the open caisson structure comprises a plurality of horizontally-arranged partitioned underground structures, and two adjacent partitioned underground structures are hermetically connected through a post-pouring belt; and the bottom end of each block underground structure is provided with a water inlet and outlet balancing module, and the water inlet and outlet balancing module is used for diluting the land below the open caisson structure by high-pressure water to obtain muddy water and soil solution and then pumping out the muddy water and the soil solution together. The large underground space is divided into a plurality of small blocks by combining the structural post-cast strip setting position of the underground space, the blocks are constructed by a mud-water balance open caisson method, and each section of open caisson section is sunk by a mud-water balance system. The sinking speed of the open caisson can be adjusted at any time in the sinking process, and the trenchless automatic construction is realized. According to the scheme, foundation pit supporting structure construction does not need to be carried out on foundation pits in the underground space range, and after each layer of main structure of the underground space is cast in situ above the field ground, construction can be carried out by adopting supporting structure integration, a water and soil balance principle and automation control through section-by-section sinking, so that the construction of the main structure of the underground space can be completed. The method has the characteristics of small influence on the environment, high construction speed and high construction safety, and has certain advantage in economical efficiency.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic top view of the whole structure of the soft soil area bin-type mud-water balance open caisson underground space system;
fig. 2 is a schematic front view of the separated-bin type mud-water balanced open caisson underground space system in the soft soil area.
Description of reference numerals: the structure comprises a first block underground structure 100, a second block underground structure 200, a third block underground structure 300, a fourth block underground structure 400, a fifth block underground structure 500, a sixth block underground structure 600, a cutting edge section 1, a bottom plate section 2, a middle plate section 3, a top plate 4, a liquid inlet channel 5, a liquid outlet channel 6, a balancing weight 7, a steel strand 8, a counter-force support 9, a directional pulley 10 and a winch 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements 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.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The embodiment of the invention provides a soft soil area bin-type muddy water balance open caisson underground space system which comprises an open caisson structure, wherein the open caisson structure comprises a plurality of horizontally-arranged partitioned underground structures, and two adjacent partitioned underground structures are in sealing connection through a post-pouring belt; and the bottom end of each block underground structure is provided with a water inlet and outlet balancing module which is used for diluting and discharging the land below the open caisson structure.
It can be seen that, as shown in fig. 1 and 2, in a specific implementation scenario, the open caisson structure is divided into two blocks, namely a first block underground structure 100, a second block underground structure 200, a third block underground structure 300, a fourth block underground structure 400, a fifth block underground structure 500 and a sixth block underground structure 600. In the construction process, the first block underground structure 100, the second block underground structure 200, the third block underground structure 300 and the fourth block underground structure 400 are sequentially sunk, and the side surfaces of two adjacent blocks are sealed through a post-pouring belt when one block is sunk. Wherein, every piecemeal all is equipped with business turn over water balance module, and what business turn over water balance module adopted is muddy water balance automatic control method. Specifically, when a single block sinks, the water inlet and outlet balance module in the block is started, and the water inlet pressure, the water inlet flow, the water outlet pressure and the water outlet flow are controlled by detecting parameters such as the sinking speed and the sinking inclination rate, so that the whole block sinks stably at a preset speed. In the sinking process, upward reaction force is provided by the lifting arm in real time, the open caisson structure is suspended, and the sinking speed is prevented from being too high.
The construction method comprises the following specific steps: the method comprises the following steps of firstly carrying out region division on the whole underground space system to be constructed, then carrying out construction on one small region which is close to the edge and is divided into regions, erecting hoisting devices on two sides of the small region, then softening and evacuating the soil below the open caisson structure by the water inlet and outlet modules under the tensile force action of the hoisting devices, and thus realizing the slow sinking of the open caisson structure. After a sunk well structure is constructed, a post-cast strip sealing structure is cast in place or connected on the side wall, so that the post-cast strip sealing structure can be used as a supporting foundation, a sunk well structure of another small area beside the sunk well structure is constructed, and the like.
The automatic control method for the muddy water balance adopts the prior art, and one of the methods is as follows: the system comprises a side wall friction monitoring module, a displacement monitoring module, a mud liquid control module, a bottom plate counter-force monitoring module and an automatic control module, wherein the side wall friction monitoring module is used for monitoring the friction force f applied to the side wall in the sinking process of the open caisson structure; the displacement monitoring module is used for monitoring the elevation S in the sinking process of the open caisson structure; the mud liquid control module is used for controlling the lower liquid inlet amount V in the sinking process of the open caisson structure1Liquid inlet pressure N1Liquid output V2And the pressure N of the liquid outlet2(ii) a The bottom plate reaction force monitoring module is used for monitoring the pressure P below the bottom plate of the open caisson structure in real time; the automatic control module is used for adjusting the liquid inlet quantity V of the mud liquid control module in real time according to the frictional resistance f, the elevation S and the pressure P1Liquid inlet pressure N1Liquid output V2And the pressure N of the liquid outlet2So as to control the open caisson structure to stably sink according to a preset speed.
The specific control method comprises the following steps:
s01: obtaining the counter force F, the frictional resistance F, the elevation S and the pressure P below the bottom plate in the sinking process of the partitioned underground structure in real time;
s02: calculating the sinking coefficient K according to the formula (1)stIf K isstIf greater than 1.1, it means that the underground structure of the block is descending too fast, and if K isstIf the liquid volume is less than 1.05, the block underground structure descends too slowly, and the descending rate is adjusted by adjusting the liquid volume;
Kst＝(F+G)/(f+P) (1)
wherein G is the self weight of the block underground structure;
s03: calculating a sinking inclination rate according to a formula (2), and correspondingly changing the liquid inlet and outlet amount of the block underground structure at the corresponding position to adjust the sinking stability;
I＝(S-S’)/B (2)
wherein S is the elevation of one side of the block underground structure, S' is the elevation of the other side of the block underground structure, and B is the horizontal distance between one side and the other side of the block underground structure.
The preferred scheme, business turn over water balance module includes first pressure source and second pressure source, a plurality of independent flow channel each other that link up from top to bottom are equipped with in the underground structure of piecemeal, flow channel includes inlet channel 5 and liquid outlet channel 6, inlet channel 5 with first pressure source intercommunication, liquid outlet channel 6 with second pressure source intercommunication, inlet channel 5 with liquid outlet channel 6 all be equipped with the passageway of the soft earth intercommunication of underground structure below of piecemeal.
As shown in fig. 1 and 2, during the sinking process of the underground structure, high-pressure liquid is delivered to the liquid inlet channel 5 by the first pressure source, and then the high-pressure liquid is jetted to soft soil below the underground structure by the branch pipes of the liquid inlet channel 5 below the underground structure, so that the soft soil is diluted, and then the diluted soft soil is discharged through the channel of the liquid outlet channel 6 by the negative pressure action of the second pressure source. Therefore, soft soil below the block underground structure can be diluted and then extracted, and the block underground structure slowly sinks to a specified position under the control of self weight or liquid flow pressure. Each branch pipe covers the lower part of the whole block underground structure, and in the sinking process, the liquid flow emergent pressure of the branch pipe is adjusted by controlling the pressure of the pressure source and the suction intensity of the liquid outlet channel is matched, so that the sinking speed of the whole open caisson structure can be controlled.
Preferably, the blocking underground structure comprises at least one vertically arranged open caisson section, the open caisson section comprises a cutting edge foot section 1, a bottom plate section 2, a middle plate section 3 and a top plate section 4 which are sequentially and hermetically connected from bottom to top, and the bottom end of the cutting edge foot section 1, the bottom end of the bottom plate section 2, the bottom end of the middle plate section 3 and the bottom end of the top plate section 4 are communicated through a water inlet and outlet balancing module.
Therefore, as shown in fig. 2, the partitioned underground space of each sub-bin comprises a blade foot section 1, a bottom plate section 2, a middle plate section 3 and a top plate section 4. Each section (1-4) comprises a corresponding structural plate, a wall, a beam column and the like. The invention shows three layers of underground spaces, and if the number of the underground spaces is other layers, the middle plate section 3 can be correspondingly increased or decreased. In the horizontal direction, the length and the width of each block are only schematic, and the underground space can be divided by combining a post-cast strip, a reinforcing strip and the like of each underground space, the post-cast strip and the reinforcing strip of each underground space can be used as a supporting foundation to provide support for a hoisting structure of each area, and then the open caisson structures corresponding to the areas are settled in sequence respectively.
In the preferable scheme, the side surfaces of two adjacent block underground structures in the horizontal direction are provided with plugging steel plates. As shown in fig. 1, during the construction process, the first sub-block underground structure 100 of the first sinking section is sunk first, the second sub-block underground structure 200 is sunk later, and the rest of the sub-blocks are sunk successively by analogy. The sealing steel plates are arranged on the connecting sides of all the blocks in a sealing mode, the periphery of the abutted part is sealed after the blocks sink, and the gap can be sealed and plugged through the post-pouring belt. And after the construction is finished, cutting off the plugging steel plate, and communicating all the blocks.
In a preferred scheme, a balancing weight 7 is arranged at the bottom end of the block underground structure. Therefore, by setting the size of the balancing weight 7, when the underground structure is partitioned, the balancing weight is prevented from being arranged at the bottom end of the partition, and the sinking rate of the underground structure is accelerated.
Specifically, the liquid inlet pressure N in the mud liquid control module is adjusted according to different stratums in the sinking process of each open caisson section1And the pressure N of the liquid outlet2And simultaneously, all displacement indexes in the displacement monitoring module and the reaction force monitoring indexes in the bottom plate reaction force monitoring module are fed back to the automatic control module. And adjusting the working state of each module of the open caisson section according to the judgment of the automatic control module, such as adjusting the number of the counterweight blocks, the pressure of inlet and outlet liquid and the like. And on the premise that all indexes meet the judgment requirement, sinking the open caisson section to a control elevation to complete the construction of the open caisson structure.
In summary, in a specific embodiment, different from the traditional open caisson construction, the open caisson underground space construction technology adopting the separate chamber type mud-water balance construction method is to divide the large underground space into a plurality of small blocks in combination with the positions of the main structure post-cast strip, the anti-seismic seam and the like. Each block underground structure is provided with a blade foot section 1, a bottom plate section 2, a middle plate section 3 and a top plate section 4 which form a surrounding open caisson structure. Each open caisson is composed of corresponding plates, walls, beams and columns and the like. The pre-buried pipelines under the cutting edge joint bottom plate are respectively and independently communicated with the liquid inlet channel 5 and the liquid outlet channel 6. In the sinking process of each sinking well section, the liquid inlet channel 5 and the liquid outlet channel 6 are respectively connected with a positive pressure source and a negative pressure source, high-pressure water is pressed into a pipeline by the liquid inlet channel 5 under certain pressure and then is sprayed into soil below the bottom plate, soil in the soil layer below the bottom plate is hydrated, and the soil body hydrated by the soil below the bottom plate is completely pumped and discharged by the liquid outlet channel 6, so that the sinking of each sinking well section is realized. When the sinking is difficult, the corresponding balancing weight 7 can be arranged according to the sinking gravity demand to accelerate the sinking. The locking device consists of a steel strand 8 pre-embedded on the open caisson wall structure, a counter-force support 9, a directional slider 10 and a winch 11. The working principle of the locking device is that after the winch 11 is started, the steel strand 8 is pulled, upward pulling force is provided for each open caisson section through the directional pulleys 10, and the counter force support 9 provides a fulcrum to balance vertical force. When the open caisson needs to be locked, the locking device is started, or the locking device can be started at the beginning of construction, and a highest speed limit value is set. The rotating speed of the winch is monitored in real time through the angular velocity sensor, so that the sinking speed of the open caisson structure can be known, and when the sinking speed exceeds the limiting speed of the winch 11, the winch 11 can be automatically clamped to stop operation, and the purpose of locking is achieved. Or may be manually locked. The automatic dead-locking principle of the winch is the prior art, such as a self-locking structure of an elevator and the like, and is not described herein again.
The scheme is 'funding national key research and development plan (2018YFC 0808702)', English notation: "National KeyR & D Program of China (2018YFC 0808702)".
The invention has the beneficial effects that: the invention provides a soft soil area bin-type mud-water balance open caisson underground space system which comprises an open caisson structure and a locking device, wherein the locking device comprises a lifting arm, the lifting arm is detachably connected with the open caisson structure, the open caisson structure comprises a plurality of horizontally-arranged partitioned underground structures, and two adjacent partitioned underground structures are hermetically connected through a post-pouring belt; and the bottom end of each block underground structure is provided with a water inlet and outlet balancing module, and the water inlet and outlet balancing module is used for diluting the land below the open caisson structure by high-pressure water to obtain muddy water and soil solution and then pumping out the muddy water and the soil solution together. The large underground space is divided into a plurality of small blocks by combining the structural post-cast strip setting position of the underground space, the blocks are constructed by a mud-water balance open caisson method, and each section of open caisson section is sunk by a mud-water balance system. The sinking speed of the open caisson can be adjusted at any time in the sinking process, and the trenchless automatic construction is realized. According to the scheme, foundation pit supporting structure construction does not need to be carried out on foundation pits in the underground space range, and after each layer of main structure of the underground space is cast in situ above the field ground, construction can be carried out by adopting supporting structure integration, a water and soil balance principle and automation control through section-by-section sinking, so that the construction of the main structure of the underground space can be completed. The method has the characteristics of small influence on the environment, high construction speed and high construction safety, and has certain advantage in economical efficiency.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (8)
1. The utility model provides a soft soil area bin-type muddy water balance open caisson underground space system, includes open caisson structure, its characterized in that: the open caisson structure further comprises a locking device, wherein the locking device comprises a lifting arm, and the lifting arm is detachably connected with the open caisson structure;
the open caisson structure comprises a plurality of horizontally arranged partitioned underground structures, and two adjacent partitioned underground structures are in sealing connection through a post-cast strip;
and the bottom end of each block underground structure is provided with a water inlet and outlet balancing module, and the water inlet and outlet balancing modules are used for diluting the land below the open caisson structure by high-pressure water to obtain muddy water and soil liquid and then pumping out the muddy water and the soil liquid together.
2. The soft soil area bin-type mud water balance open caisson underground space system of claim 1, wherein: the water inlet and outlet balancing module comprises a first pressure source and a second pressure source, a plurality of independent liquid inlet channels and liquid outlet channels which are communicated up and down are arranged in the partitioned underground structure, the liquid inlet channels are communicated with the first pressure source, and the liquid outlet channels are communicated with the second pressure source.
3. The soft soil area bin-type mud water balance open caisson underground space system of claim 1, wherein: and dividing the position of the underground space combined with the post-cast strip and/or the anti-seismic seam of the main body structure into a plurality of small blocks, wherein the interval size of each small block is the space size of the partitioned underground structure.
4. The soft soil area bin-type mud water balance open caisson underground space system of claim 1, wherein: the hoisting mechanism comprises a steel strand, a counter-force support, a directional slider and a winch, the counter-force support is fixed on two sides of the open caisson structure, a directional pulley is arranged on the counter-force support, one end of the steel strand is connected with the winch, and the other end of the steel strand is detachably connected with the open caisson structure after bypassing the directional pulley.
5. The soft soil area bin-type mud water balance open caisson underground space system of claim 1, wherein: the hoisting mechanism further comprises an automatic clamping unit, an angular velocity sensor is arranged on a rotating shaft of the winch, and the angular velocity sensor is connected with the automatic clamping unit.
6. The soft soil area bin-type mud water balance open caisson underground space system of claim 1, wherein: the blocking underground structure comprises at least one vertically-arranged open caisson section, the open caisson section comprises a cutting edge foot section, a bottom plate section, a middle plate section and a top plate section which are sequentially connected in a sealing mode from bottom to top, and the bottom end of the cutting edge foot section, the bottom end of the bottom plate section, the bottom end of the middle plate section and the bottom end of the top plate section are communicated through a water inlet and outlet balance module.
7. The soft soil area bin-type mud water balance open caisson underground space system of claim 1, wherein: and the side surfaces of two adjacent block underground structures in the horizontal direction are provided with plugging steel plates.
8. The soft soil area bin-type mud water balance open caisson underground space system of claim 1, wherein: and a balancing weight is arranged at the bottom end of the block underground structure.
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| CN114086455A (en) * | 2021-10-22 | 2022-02-25 | 中铁第四勘察设计院集团有限公司 | Overlength structure of railway passenger station |
| CN114575367A (en) * | 2022-04-22 | 2022-06-03 | 广东韩江工程总承包有限公司 | Concrete open caisson construction method |
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