CN119288501B - Water-rich sand layer connecting channel excavation construction method - Google Patents
Water-rich sand layer connecting channel excavation construction method Download PDFInfo
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- CN119288501B CN119288501B CN202411813501.1A CN202411813501A CN119288501B CN 119288501 B CN119288501 B CN 119288501B CN 202411813501 A CN202411813501 A CN 202411813501A CN 119288501 B CN119288501 B CN 119288501B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F3/00—Pumps using negative pressure acting directly on the liquid to be pumped
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
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- General Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
本发明提供一种富水砂层联络通道开挖施工方法，属于地下通道施工技术领域，具体包括以下步骤：步骤S1，确定联络通道的位置；步骤S2，在确定好的位置上进行钻孔并进行注浆，将联络通道施工区域进行加固；步骤S3，在联络通道两端的其中一个隧道内确定水平的真空降水孔位置；步骤S4，在真空降水孔位置布设真空降水设备；步骤S5，通过真空降水设备排除联络通道外围的地下水，以确保开挖安全；步骤S6，降水完成后开始开挖联络通道设定距离；步骤S7，重复步骤S2‑S6，直至开挖完毕；以解决现有的施工方式不方便在地面上直接降水的技术问题。
The invention provides a water-rich sand layer communication channel excavation construction method, which belongs to the technical field of underground channel construction, and specifically comprises the following steps: step S1, determining the position of the communication channel; step S2, drilling and grouting at the determined position, and reinforcing the construction area of the communication channel; step S3, determining the position of a horizontal vacuum dewatering hole in one of the tunnels at both ends of the communication channel; step S4, arranging vacuum dewatering equipment at the position of the vacuum dewatering hole; step S5, removing groundwater outside the communication channel by the vacuum dewatering equipment to ensure excavation safety; step S6, starting to excavate the communication channel for a set distance after dewatering is completed; step S7, repeating steps S2-S6 until excavation is completed, so as to solve the technical problem that the existing construction method is inconvenient to directly dewater on the ground.
Description
Technical Field
The invention belongs to the technical field of underground passage construction, and particularly relates to a water-rich sand layer connecting passage excavation construction method.
Background
Urban development aggravates urban traffic pressure, and in order to relieve urban traffic pressure, many cities take measures, but are limited by urban scale and land area, and many cities have difficulty in developing ground traffic on a large scale, so that more and more cities start to build subway engineering.
Some construction areas can encounter water-rich sand layer when being constructed, the water-rich sand layer is a special geological structure composed of soil particles and water resources, the flowing rule of water in the water-rich sand layer is relatively complex, the space structure of the soil particles of the water-rich sand layer is numerous, meanwhile, the water-rich sand layer has different forms, when tunnels such as subways or connecting channels are constructed in the areas, the strata is very easy to be in plastic-flowing deformation, so that sand gushing and sliding collapse occur in the construction, the primary support deformation of the tunnels is caused, the construction safety is endangered, the tunnels collapse due to heavy weight, and safety accidents are caused.
In order to avoid the influence on construction when the water-rich sand layer is used for constructing the communication channels between subways, the conventional method is to firstly carry out underground water precipitation, the conventional water precipitation method is well-point water precipitation, however, as the subways shield construction is mostly in a busy section, the communication channels are positioned below the major channels with heavy traffic, the pipelines on the upper surface are dense, and the large-area arrangement of construction machinery and the arrangement of water precipitation well sites are inconvenient.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a water-rich sand layer connecting channel excavation construction method, which aims to solve the technical problem that the existing construction mode is inconvenient to directly lower water on the ground.
In order to achieve the purpose, the water-rich sand layer connecting channel excavation construction method provided by the invention provides the following technical scheme:
the water-rich sand layer connecting channel excavation construction method comprises the following steps of:
step S1, determining the position of a contact channel;
S2, drilling holes at the determined positions, grouting, and reinforcing the construction area of the communication channel;
s3, determining the position of a horizontal vacuum precipitation hole in one of the tunnels at two ends of the connecting channel;
s4, arranging vacuum precipitation equipment at the vacuum precipitation hole position;
s5, removing underground water at the periphery of the communication channel through vacuum dewatering equipment so as to ensure excavation safety;
s6, starting to excavate a communication channel for a set distance after precipitation is completed;
And S7, repeating the steps S2-S6 until the excavation is completed.
As a further optimized technical scheme, in step S4, the vacuum dewatering equipment comprises vacuum dewatering pipes, a main water collecting pipe and a vacuum pump, wherein the vacuum dewatering pipes are circumferentially arranged at intervals around the outer side of the communication channel, each vacuum dewatering pipe is communicated with the main water collecting pipe through a quick connecting flange structure, and the main water collecting pipe is communicated with the vacuum pump.
As a further optimized technical scheme, the quick connecting flange structure comprises a first flange and a second flange, wherein the first flange is arranged on one pipe body of the vacuum water-reducing pipe or the main water-collecting pipe, and the second flange is arranged on the other pipe body;
The connecting blocks are provided with connecting rods and positioning blocks which are integrally connected and have different radial sizes, the diameter of each connecting rod is smaller than that of each positioning block, and one end of each connecting rod, which is far away from each positioning block, is fixedly connected with the first flange;
The second flange is provided with a connecting groove and a limiting structure, the connecting groove is used for placing the positioning block, and the limiting structure is used for being clamped on the connecting rod and pressing the positioning block so as to realize connection between the first flange and the second flange.
As a further optimized technical scheme, the annular sliding groove is arranged on the end face, facing the first flange, of the second flange, the connecting groove is arranged at the bottom of the annular sliding groove, each position, close to the connecting groove, in the annular sliding groove is provided with one limiting structure, and a driving structure is connected between the limiting structures so as to drive the limiting structures to slide along the annular sliding groove.
As a further optimized technical scheme, the limiting structure is of a block arc block structure matched with the annular chute, the limiting structure is provided with an arc groove with one end open, the opening of the arc groove faces the adjacent connecting groove, and the width of the arc groove is not smaller than the radial size of the connecting rod and smaller than the radial size of the positioning block.
As a further optimized technical scheme, the limiting structures are arranged in two groups, and the two groups of limiting structures are symmetrically arranged in the annular chute;
The driving structure comprises an elastic connecting piece, a rope-shaped traction piece and a driving unit, wherein the rope-shaped traction piece is arranged in each group of limiting structures, two ends of the rope-shaped traction piece are respectively connected with one limiting structure, two ends of the elastic connecting piece are respectively connected with one end of one group of limiting structures, the other ends of the two groups of limiting structures are connected with the driving unit through the rope-shaped traction piece, and the driving unit pulls the two groups of limiting structures to slide along the annular sliding groove through the rope-shaped traction piece.
As a further optimized technical scheme, the driving unit comprises a screw, one end of the screw penetrates through the side wall of the second flange and stretches into the annular chute, the screw is in threaded connection with the second flange, one end of the screw penetrating into the annular chute is fixedly connected with rope-shaped traction pieces on two sides respectively, the screw is rotated, and the rope-shaped traction pieces on two sides are wound or separated from the screw.
As a further optimized technical scheme, a protective cylinder is sleeved outside one end of the screw extending into the annular chute, one end of the protective cylinder is fixedly connected with the annular chute, the other end of the protective cylinder is in running fit with the screw, and the connection position of the rope-shaped traction piece and the screw is located in the protective cylinder.
As a further optimized technical scheme, the quick connecting flange structure further comprises a pre-tightening gasket, the pre-tightening gasket is provided with perforations corresponding to the positioning blocks, one side of each perforation, which faces the second flange, is provided with a compression block, and when the first flange and the second flange are connected, the limiting structure is matched with the compression block in a sliding mode, so that the first flange is stably connected with the second flange.
As a further optimized technical scheme, the top surface of the limiting structure is obliquely arranged, one end, close to the connecting groove, of the limiting structure is inclined upwards towards the end far away from the connecting groove, the pressing block is obliquely arranged towards one side of the second flange, and the inclination direction of the pressing block is opposite to that of the limiting structure.
The construction method has the advantages that precipitation is transferred from the ground to the hole for construction, a precipitation well does not need to be arranged on the ground, the ground surface space is not occupied, the influence on a construction area is small, in addition, water extracted by vacuum precipitation is clean clear water, pollution-free and directly-discharged, the requirement of green construction specification is met, and good environmental protection benefits are achieved. In addition, grouting reinforcement is carried out before construction, the physical properties of the original soil body are changed, the soil body density is increased, the compressive strength of the original soil body is improved, the risk of ground settlement is further reduced in the construction communication channel process, and the safety of a ground building is guaranteed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
FIG. 1 is a schematic illustration of a construction flow according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of grouting construction according to an embodiment of the present invention;
FIG. 3 is a schematic view of a vacuum dewatering hole arrangement according to an embodiment of the present invention;
FIG. 4 is a schematic view of a vacuum dewatering apparatus according to an embodiment of the present invention;
FIG. 5 is an exploded view of a quick connect flange according to one embodiment of the present invention;
FIG. 6 is a schematic view of a first flange structure according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an assembly of a second flange and a pre-load gasket according to one embodiment of the present invention;
FIG. 8 is a schematic view of a second flange structure according to an embodiment of the present invention;
Fig. 9 is a schematic view showing an operating state of the quick-connect flange structure according to an embodiment of the present invention.
In the figure, 1, a communication channel, 2, a vacuum dewatering hole, 3, a tunnel, 301, a grouting drilling direction, 4, a vacuum dewatering pipe, 5, a main water collecting pipe, 6, a vacuum pump, 7, a quick connecting flange structure, 701, a first flange, 7011, a connecting rod, 7012, a positioning block, 702, a second flange, 7021, a connecting groove, 7022, a limiting structure, 7122, a clamping block, 7023, an annular chute, 7123, a clamping groove, 7024, an arc-shaped groove, 7025, an elastic connecting piece, 7026, a rope-shaped traction piece, 7027, a driving unit, 7127, a screw, 7227, a protective cylinder, 7327, a stop block, 7427, a driving block, 7028, a positioning hole, 7029, a positioning column, 703, a pre-tightening gasket, 7031, a perforation, 7032 and a pressing block.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly, and may be, for example, fixedly coupled or detachably coupled, or may be directly coupled or indirectly coupled through intermediate members, as will be apparent to those of ordinary skill in the art, in view of the detailed description of the terms.
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The shapes and sizes of the various components in the drawings do not reflect the actual proportions of the product, and are intended to illustrate the invention only.
The invention provides a construction method for excavating a water-rich sand layer connecting channel, which changes ground precipitation into underground vacuum precipitation, thereby reducing the influence on the built building and pipelines above a construction area.
Example 1
As shown in fig. 1, the water-rich sand layer connecting channel excavation construction method comprises the following steps:
and step S1, determining the position of the connecting channel 1, confirming the construction position of the connecting channel 1 according to the design drawing, and preparing for construction.
Step S2, as shown in FIG. 2, drilling holes before grouting are formed in the tunnel 3 at one end of the determined specific position in the extending direction of the connecting channel 1, grouting holes are formed in the direction 301 of the grouting holes in a radial mode around the connecting channel 1, grouting is performed in the holes after the drilling holes are formed, grouting slurry is mortar and used for expelling underground water, and a part to be excavated with high water content is solidified, so that the soil layer strength near the connecting channel is enhanced, the bearing capacity of the soil layer is increased, and the excavation safety is guaranteed.
And step S3, determining the positions of horizontal vacuum dewatering holes 2 in one of the tunnels 3 at the two ends of the communication channel 1, wherein the vacuum dewatering holes 2 are circumferentially spaced around the outer side of the communication channel 1 as shown in fig. 3.
In step S4, as shown in FIG. 4, vacuum dewatering equipment is arranged at the position of the vacuum dewatering hole 2, wherein the vacuum dewatering equipment comprises vacuum dewatering pipes 4, a total water collecting pipe 5 and a vacuum pump 6, the vacuum dewatering pipes 4 are arranged in the vacuum dewatering hole 2, namely, the vacuum dewatering pipes 4 are circumferentially arranged at intervals around the outer side of the communication channel 1, each vacuum dewatering pipe 4 is communicated with the total water collecting pipe 5, and the total water collecting pipe 5 is communicated with the vacuum pump 6.
Specifically, vacuum precipitation hole 2 horizontal depth 6m, at the connection passageway 1 circumference 10 vacuum holes of arranging, the vacuum precipitation pipe 4 that inserts the stratum uses the filter screen parcel, can not cause the loss of solid particle thing in fine sand soil layer + the clay layer, and the effect of precipitation is reliable, reduces the potential safety hazard that connection passageway 1 excavated probably appears, reduces the moisture content of moisture soil layer, prevents excavation face unstability.
S5, removing underground water at the periphery of the communication channel 1 through vacuum dewatering equipment so as to ensure excavation safety;
Step S6, starting to excavate the connecting channel 1 for a set distance after precipitation is finished, wherein the specific connecting channel 1 is excavated by adopting an up-down step excavation method, the excavation circulating footage is 0.5m, steel arch installation, steel bar mesh hanging and concrete spraying construction are timely carried out after each excavation footage is finished, the step is excavated after the upper step is excavated for 2-3m, a large sample of grids is required to be firstly excavated and temporary grids are installed when a tunnel portal is excavated, and the temporary grids are removed and formal grids are installed after a working face vacates.
And S7, repeating the steps S2-S6 until the excavation is completed.
Further, the existing vacuum downcomer 4 is connected with the main header 5 by using common flanges, each common flange needs to be connected by using a plurality of groups of bolts and nuts in a circumferential matching way, the connection operation is time-consuming, so that the efficiency of assembling the vacuum downcomer 4 with the main header 5 is low, and in order to improve the assembly efficiency of the vacuum downcomer 4 with the main header 5, the vacuum downcomer 4 is connected with the main header 5 by a quick connection flange structure 7.
As shown in fig. 5, the quick connection flange structure 7 includes a first flange 701 and a second flange 702, the first flange 701 is disposed on one of two pipe bodies of the vacuum downcomer 4 or the header 5, and the second flange 702 is disposed on the other pipe body, in this embodiment, the first flange 701 is uniformly mounted on the header 5, and the second flange 702 is uniformly mounted on one end of the vacuum downcomer 4. In other embodiments, the first flange 701 may also be mounted on the vacuum downcomer 4, in which case the second flange 702 is mounted at one end of the header 5.
As shown in fig. 6, a plurality of connection blocks are circumferentially and alternately arranged on the end surface of the first flange 701 facing away from the total water collecting pipe 5, each connection block is provided with a connection rod 7011 and a positioning block 7012 which are integrally connected and have different radial dimensions, the diameter of the connection rod 7011 is smaller than that of the positioning block 7012, and one end of the connection rod 7011 facing away from the positioning block 7012 is fixedly connected with the first flange 701.
As shown in fig. 8, the second flange 702 is provided with a connecting groove 7021 and a limiting structure 7022, the connecting groove 7021 is used for placing the positioning block 7012, and the limiting structure 7022 is used for being clamped on the connecting rod 7011 and pressing the positioning block 7012 so as to realize connection between the first flange 701 and the second flange 702.
Specifically, an annular sliding groove 7023 is arranged on the end surface of the second flange 702 facing the first flange 701, connecting grooves 7021 are arranged at the bottom of the annular sliding groove 7023, a limiting structure 7022 is arranged in each position, close to the connecting grooves 7021, in the annular sliding groove 7023, specifically, the limiting structures 7022 are arranged in one-to-one correspondence with the connecting grooves 7021, and each connecting groove 7021 is correspondingly provided with a limiting structure 7022. A driving structure is connected between the limiting structures 7022 to drive the limiting structures 7022 to slide along the annular sliding groove 7023.
As shown in fig. 9, in the present embodiment, the limiting structure 7022 is a block arc-shaped block structure that is adapted to the annular chute 7023, that is, the outer shape of the limiting structure 7022 is adapted to the annular chute 7023, so as to be able to stably slide along the annular chute 7023. In addition, a clamping groove 7123 coaxially arranged with the annular sliding groove 7023 is formed in the bottom of the annular sliding groove 7023, a clamping block 7122 used for being clamped in the clamping groove 7123 is integrally and fixedly connected to the bottom of the limiting structure 7022, the clamping block 7122 can slide along the clamping groove 7123, the cross sections of the clamping groove 7123 and the clamping block 7122 can be in a dovetail groove shape, and therefore the limiting structure 7022 can not be separated from the annular sliding groove 7023 when sliding along the annular sliding groove 7023. Thereby achieving a stable connection of the spacing structure 7022 to the second flange 702. The limiting structure 7022 is provided with an arc-shaped groove 7024 with an opening at one end, the opening of the arc-shaped groove 7024 faces the adjacent connecting groove 7021, and the width of the arc-shaped groove 7024 is not smaller than the radial dimension of the connecting rod 7011 and smaller than the radial dimension of the positioning block 7012. In this way, when the first flange 701 is connected to the second flange 702, the positioning block 7012 is inserted into the connecting slot 7021, the driving structure drives the limiting structure 7022 to slide along the annular chute 7023, and in the sliding process, the arc-shaped slot 7024 is clamped on the connecting rod 7011 from one end of the opening, so as to realize the fixed connection between the first flange 701 and the second flange 702.
In this embodiment, the limiting structures 7022 are provided in two groups, and the two groups of limiting structures 7022 are symmetrically arranged in the annular chute 7023;
The driving structure comprises an elastic connecting piece 7025, a rope-shaped traction piece 7026 and a driving unit 7027, the rope-shaped traction piece 7026 is arranged in each group of limiting structures 7022, two ends of the rope-shaped traction piece 7026 are respectively connected with one limiting structure 7022, two ends of the elastic connecting piece 7025 are respectively connected with one end of one group of limiting structures 7022, the other ends of the two groups of limiting structures 7022 are connected with the driving unit 7027 through the rope-shaped traction piece 7026, and the driving unit 7027 pulls the two groups of limiting structures 7022 to slide along the annular sliding groove 7023 through the rope-shaped traction piece 7026. The specific driving unit 7027 includes a screw 7127, one end of the screw 7127 passes through the side wall of the second flange 702 and extends into the annular chute 7023, the length of the screw 7127 can be appropriately adjusted according to actual needs, the screw 7127 is in threaded connection with the second flange 702, and in order to ensure stability of threaded connection, a fixing block is integrally arranged at a position of the second flange 702 where the screw 7127 is installed, so that the size of the position is thickened, a threaded connection path between the screw 7127 and the second flange 702 is increased, and stability of connection is ensured.
One end of the screw rod 7127 penetrating into the annular chute 7023 is fixedly connected with the rope-shaped traction members 7026 on two sides respectively, when the screw rod 7127 is rotated in one direction, the rope-shaped traction members 7026 on two sides are gradually wound around the screw rod 7127, so that the rope-shaped traction members 7026 are tensioned, at the moment, the limiting structure 7022 is clamped on the connecting rod 7011 under the pulling of the rope-shaped traction members 7026, when the screw rod 7127 is rotated in the other direction, the rope-shaped traction members 7026 are gradually separated from the screw rod 7127, and under the action of the elastic connecting member 7025, the limiting structure 7022 is separated from the limitation of the positioning block 7012, so that the first flange 701 and the second flange 702 can be detached.
Further, a protective cylinder 7227 is sleeved outside one end of the screw 7127 extending into the annular chute 7023, one end of the protective cylinder 7227 is fixedly connected with the annular chute 7023, the other end of the protective cylinder 7227 is in rotary fit with the screw 7127, and the connection position of the rope-shaped traction piece 7026 and the screw 7127 is located in the protective cylinder 7227. In this way, the location on the screw 7127 where the rope retractor 7026 is wound is inside the guard barrel 7227 such that the rope retractor 7026 wound on the screw 7127 does not interfere with the normal threaded connection of the screw 7127 to the second flange 702. In addition, a stopper 7327 is fixedly provided at an end of the screw 7127 extending into the protective tube 7227, and the stopper 7327 can prevent the rope-like drag member 7026 from being separated from the screw 7127 from an end of the screw 7127 when the rope-like drag member is normally wound around the screw 7127. Meanwhile, in order to facilitate screwing of the screw 7127, a regular polygon driving block 7427 is fixedly connected to one end of the screw 7127 outside the second flange 702, and the driving block 7427 facilitates force application of a force application tool, so that the screw 7127 is conveniently driven to rotate.
Further, in order to ensure that the first flange 701 and the second flange 702 are stably connected, the quick connecting flange structure 7 further includes a pre-tightening gasket 703, the pre-tightening gasket 703 is provided with through holes 7031 corresponding to the positioning blocks 7012, a compression block 7032 is disposed at one side of each through hole 7031 facing the second flange 702, and when the first flange 701 and the second flange 702 are connected, the limiting structure 7022 slides along the annular chute 7023 to be matched with the compression block 7032, so that the first flange 701 is stably connected with the second flange 702. In addition, in order to make the limiting structure 7022 stably cooperate with the compression block 7032, that is, when the limiting structure 7022 slides towards the compression block 7032, the pre-tightening gasket 703 cannot rotate relatively, two positioning posts 7029 are provided on the end face of the second flange 702, positioning holes 7028 that cooperate with the positioning posts 7029 are provided on the corresponding pre-tightening gasket 703 and the first flange 701, as shown in fig. 5 and 7, when the first flange 701 and the second flange 702 are connected, the positioning posts 7029 can realize quick connection by passing through the pre-tightening gasket 703 and the positioning holes 7028 on the first flange 701.
Further, in order to conveniently realize the press fit between the limiting structure 7022 and the pre-tightening gasket 703, the top surface of the limiting structure 7022 is inclined, and the end, which is close to the connecting groove 7021, of the limiting structure 7022 is inclined upwards to the end, which is far away from the connecting groove 7021, of the pressing block 7032 is inclined towards one side of the second flange 702, and the inclination direction is opposite to that of the limiting structure 7022.
In this way, as shown in fig. 9, when the first flange 701 and the second flange 702 are connected, the positioning block 7012 on the first flange 701 extends into the connecting groove 7021 on the second flange 702, and the screw 7127 is screwed, so that the rope-shaped traction member 7026 is wound around the screw 7127, and meanwhile, the rope-shaped traction member 7026 pulls the limiting structure 7022 to be clamped on the connecting rod 7011, and in the clamping process, the limiting structure 7022 gradually compresses the compressing block 7032 on the pre-tightening gasket 703, thereby further ensuring the connection stability of the first flange 701 and the second flange 702. When the first flange 701 and the second flange 702 need to be disassembled, the screw 7127 is rotated in the opposite direction, and under the action of the elastic connecting piece 7025, the limiting structure 7022 gradually breaks away from the limitation of the positioning block 7012, so that the positioning block 7012 is pulled out from the connecting groove 7021, and the separation of the first flange 701 and the second flange 702 is realized. When the quick connecting flange structure 7 is operated, compared with the prior art for installing a plurality of groups of bolt and nut assemblies, only one screw 7127 is required to be screwed, so that the operation is more convenient, and the assembly efficiency of the vacuum downcomer 4 and the total water collecting pipe 5 is improved.
It is to be understood that the above description is intended to be illustrative, and that the embodiments of the present application are not limited thereto.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (6)
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| CN202411813501.1A CN119288501B (en) | 2024-12-11 | 2024-12-11 | Water-rich sand layer connecting channel excavation construction method |
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| CN210917432U (en) * | 2019-10-29 | 2020-07-03 | 中建七局安装工程有限公司 | Foundation pit dewatering recycling system |
| CN218719524U (en) * | 2022-11-19 | 2023-03-24 | 武汉中科博大环保工程有限公司 | Pipeline connecting piece and sewage treatment integrated device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103628915A (en) * | 2013-11-28 | 2014-03-12 | 中铁十三局集团有限公司 | Dewatering and drainage method for large-section water-rich saturation fine-silt tunnel |
| CN112502734A (en) * | 2020-11-30 | 2021-03-16 | 中铁二十局集团有限公司 | Construction method of shield interval contact channel of water-rich sand layer |
| CN220784797U (en) * | 2023-08-29 | 2024-04-16 | 潍坊格瑞三剂化工装备有限公司 | Quick die changing device for vertical strip extruder |
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