CN115324031A

CN115324031A - Construction method for preventing groove wall collapse during continuous wall grooving, storage device and groove milling machine

Info

Publication number: CN115324031A
Application number: CN202210985142.2A
Authority: CN
Inventors: 李增良; 刘少华; 刘晓勇; 刘建波; 窦学杰; 张永坤; 邓杰; 兰孟; 叶凯阳; 宋振
Original assignee: China Railway 20th Bureau Group Corp; China Railway 20th Bureau Group South Engineering Co Ltd
Current assignee: China Railway 20th Bureau Group Corp; China Railway 20th Bureau Group South Engineering Co Ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-11-11

Abstract

The invention discloses a construction method for preventing groove wall collapse during groove forming of a continuous wall, a storage device and a groove milling machine, wherein the construction method for preventing groove wall collapse during groove forming of the continuous wall comprises the following steps: excavating a groove section through a groove milling machine, and pouring slurry into the groove section; and placing a storage device into the tank section, and enabling the storage device to be adjacent to or abut against the slurry leaking stratum section on the side wall of the tank, so that the leak-proof agent on the storage device at least partially permeates into the slurry leaking stratum section along with the slurry. The technical scheme of the invention can reduce the risk of collapse of the side wall of the groove in the grooving process of the continuous wall.

Description

Construction method for preventing groove wall collapse during continuous wall grooving, storage device and groove milling machine

Technical Field

The invention relates to the technical field of construction of underground continuous walls, in particular to a construction method for preventing groove wall collapse during groove forming of a continuous wall, a material storage device and a groove milling machine.

Background

In the underground continuous wall grooving process, the retaining wall action of slurry is usually used to prevent the underground continuous wall groove side wall from collapsing or peeling off so as to maintain the shape of the excavated groove side wall unchanged. However, due to the influence of various geological conditions, grooving processes and other factors, the problem of groove side wall collapse still often occurs during grooving construction, so that after concrete of the diaphragm wall is poured, the subsequent structural construction is influenced by the protruding concrete of the excavated exposed surface of the foundation pit.

Disclosure of Invention

The invention mainly aims to provide a construction method for preventing the collapse of a groove wall in the grooving process of a continuous wall, and aims to reduce the risk of the collapse of the side wall of the groove in the grooving process of the continuous wall.

In order to achieve the purpose, the construction method for preventing the collapse of the wall of the continuous wall in the grooving process comprises the following steps:

excavating a groove section through a groove milling machine, and pouring slurry into the groove section; and

and placing a storage device into the groove section, and enabling the storage device to be adjacent to or abut against the slurry leaking stratum section on the side wall of the groove, so that the leak-proof agent on the storage device at least partially follows the slurry to permeate into the slurry leaking stratum section.

Optionally, after the tank bottom wall of the tank section exceeds the slurry leaking stratum section by a preset distance, the storage device is withdrawn from the tank section.

Optionally, the preset distance is in a range of 0.5m to 5m.

Optionally, the specific gravity of the slurry is configured to be 1.05 to 1.15.

Optionally, the amount of water lost from the slurry is configured to be 40ml/h to 60ml/h.

The invention also provides a storage device, which is used for the construction method for preventing the tank wall from collapsing of the continuous wall grooving, wherein the storage device is provided with a storage cavity, a slurry inlet and a slurry outlet which are communicated, the storage cavity is used for storing the leak-proof agent, and the slurry inlet and the slurry outlet are used for circulating the slurry, so that the leak-proof agent at least partially permeates into the slurry leaking stratum section along with the slurry.

Optionally, the storage device includes relative first plate section and second plate section, the storage chamber with advance the thick liquid mouth all take shape in first plate section with between the second plate section, it is located to go out the thick liquid hole the second plate section, it is close to go out the thick liquid hole the setting of trough side wall.

Optionally, the first plate section is provided with a plurality of slurry inlet holes.

Optionally, the storage device further comprises a permeable fabric attached to the first plate section, and the permeable fabric at least covers the pulp inlet hole.

Optionally, the number of the slurry inlets is at least two, at least one slurry inlet is located at the top end of the storage cavity, and at least one slurry inlet is located at the bottom end of the storage cavity.

Optionally, the ratio of the diameter of the slurry outlet to the particle diameter of the leakage preventive is configured to be 5 to 15.

The invention further provides a slot milling machine which comprises a lifting frame, a milling head arranged at the lower end of the lifting frame and the storage device, wherein the storage device is connected to the lifting frame in a sliding mode along the vertical direction.

According to the technical scheme, the leakage stopping effect can be achieved more quickly through the leakage preventing agent on the storage device, so that the slurry can be quickly changed into static gel in the slurry infiltration range, a stable soaked and deposited layer is formed in the side wall of the groove, then a mud skin is formed on the surface of the side wall of the groove, and the risk of collapse of the side wall of the groove is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic flow chart of an embodiment of a construction method for preventing a wall of a continuous wall from collapsing during grooving;

FIG. 2 is a schematic diagram of a prior art configuration of a tank sidewall subjected to a slurry retaining wall to saturate the sediment layer and the crust;

FIG. 3 is a schematic structural diagram of the sink deposit and the mud skin produced by the mud retaining wall of the side wall of the continuous wall after the construction method for preventing the collapse of the wall of the continuous wall is applied;

fig. 4 is a schematic structural diagram of an embodiment of the storage device of the present invention.

The reference numbers indicate:

(a) Description of the Prior Art

Reference numerals	Name(s)	Reference numerals	Name (R)
				11＇	Guide wall	15＇	Slurry composition
12＇	Silt layer	16＇	Soaking the deposit
				13＇	Sand layer	17＇	Clay skin
14＇	Clay layer	18＇	Trough section

(b) Technical scheme of the invention

Reference numerals	Name (R)	Reference numerals	Name (R)
				11	Guide wall	20	Material storage device
12	Silt layer	21	First plate segment
				13	Sand layer	22	Second plate segment
14	Clay layer	23	Pulp inlet
				15	Slurry composition	24	Grout outlet
16	Soaking the deposited layer	25	Slurry inlet hole
				17	Clay skin	26	Water permeable fabric
18	Trough section	27	Material storage cavity

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

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.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

During the construction of underground continuous wall, the retaining wall action of slurry is usually used to prevent the side wall of the underground continuous wall from collapsing or peeling off so as to maintain the shape of the side wall of the excavated groove. However, due to the influence of various geological conditions, grooving processes and other factors, the problem of groove side wall collapse still often occurs during grooving construction, so that after concrete of the diaphragm wall is poured, the concrete with a protruding exposed surface of a foundation pit excavation influences subsequent structural construction.

In view of the above, the present invention provides a construction method for preventing a groove wall from collapsing of a continuous wall, referring to fig. 1, in an embodiment of the present invention, the construction method for preventing a groove wall from collapsing of a continuous wall includes steps S110 to S130:

and step S110, excavating a groove section through a groove milling machine (namely a double-wheel groove milling machine), and pouring slurry into the groove section.

Specifically, the slurry has the functions of wall protection, slag carrying, cooling and lubrication in the grooving process of the underground diaphragm wall, wherein the slag carrying means that the slurry with viscosity can suspend the soil slag generated by grooving construction, so that the soil slag is conveniently discharged when the slurry circulates; the cooling and lubrication means that the slurry can not only take away heat generated by a milling head of the slot milling machine in time during digging, but also lubricate the milling head to reduce abrasion. Referring to fig. 2, the wall-protecting function of the slurry 15 'refers to a function of stabilizing the side wall of the tank, and first, the hydrostatic pressure of the slurry 15' can resist the soil pressure and the water pressure acting on the side wall of the tank and prevent the infiltration of groundwater; secondly, the mud 15 ' can form a watertight mud skin 17 ' on the surface of the side wall of the groove, and the hydrostatic pressure of the mud 15 ' continuously and effectively acts on the side wall of the groove, and simultaneously prevents the side wall of the groove from peeling off; furthermore, the mud 15 'penetrates the formation to a certain extent from the surface of the side walls of the tank and adheres to the soil particles within the penetration range, i.e. the mud 15' penetrates the pores of the formation to form a static gel, the gelled mud 15 'fixes the relative position of the soil particles and forms a stable saturated deposit 16' within the side walls of the tank, which reduces the risk of collapse of the side walls of the tank and the permeability to water. It will be appreciated that embodiments of the invention provide for the stabilization of the tank sidewalls primarily by the mud 15' to prevent collapse of the tank sidewalls. It is worth mentioning that the liquid level of the slurry 15 ' is higher than the underground water level by more than 1m and higher than the bottom surface of the guide wall 11 ' by more than 0.5m during the tank forming construction, the liquid level condition of the slurry 15 ' is monitored periodically, and if the slurry 15 ' is lost, the slurry needs to be supplemented in time so as to ensure the wall protection effect of the slurry 15 '.

In this embodiment, the slurry used for filling the tank section is optionally configured as a bentonite slurry to provide a good wall protection for the tank sidewall, and the main components of the slurry include bentonite, water and additives, such as a dispersant (e.g., sodium carbonate, i.e., soda ash), a tackifier (e.g., carboxymethyl cellulose), a weighting agent (e.g., barite), and the like. Of course, in other embodiments, the slurry may be a polymer slurry, a brine slurry, or a CMC (Carboxymethyl Cellulose) slurry.

In this embodiment, further optionally, the raw material weight ratio of the bentonite slurry may be prepared in the following range, that is, water: bentonite: CMC: soda =100: (8-10): (0.1-0.3): (0.3-0.4). During the grooving construction, the slurry proportion is determined through experiments according to the concrete stratum soil quality condition, the slurry after being fully stirred is used after being swelled in a slurry storage tank for 24 hours, and the bentonite is strictly forbidden to be directly poured into the groove section for pulping. It is worth mentioning that since the CMC solution may hinder the swelling of bentonite, it is required to put the CMC solution after water is mixed with bentonite in the slurry mixing process.

Step S120, placing a storage device into the groove section, and enabling the storage device to be adjacent to or abut against the slurry leaking stratum section on the side wall of the groove, so that the leak-proof agent on the storage device at least partially permeates into the slurry leaking stratum section along with the slurry.

Referring to fig. 2, during the construction of the underground diaphragm wall, the side wall of the tank is usually distributed with strata with different geological properties in the longitudinal direction, for example, including a silt layer 12 ', a sand layer 13' and a clay layer 14 'arranged in sequence from top to bottom, and in a sand layer with large particle gaps and large permeability coefficient, the slurry 15' has a large permeability range (as shown by the width of the soaked sediment layer 16 'in fig. 2), that is, the seepage time and the seepage rate of the slurry 15' are both increased significantly. As will be appreciated, a leaking-slurry formation interval refers to a formation interval having a large amount of slurry 15' leaking such as a gravel layer or gravel layer. Without loss of generality, it is generally chosen to incorporate a leak-preventing agent such as sawdust, straw powder, etc. during the preparation of the slurry 15 'by mixing, so as to block the larger particle gaps in the interval of the slurry-leaking formation by means of the leak-preventing agent, thereby preventing the slurry 15' from leaking and achieving the purpose of plugging. Understandably, the slurry 15 ' in the groove section 18 ' continuously surges and replaces, and really permeates the leakage-proof agent in the slurry leaking stratum section along with the slurry 15 ', and the proportion of the leakage-proof agent in the doping amount of the leakage-proof agent is very small, so that the leakage-proof agent cannot rapidly reach the stratum section with the leakage-proof requirement, larger particle gaps cannot be blocked in time, and a large amount of materials of the leakage-proof agent are wasted.

Referring to fig. 3, it is assumed that the geological features of the excavation tank 18 of the present invention are the same as those of the prior art, that is, the structure of the tank sidewall includes guide walls 11, silt layers 12, sand layers 13 and clay layers 14, and in the sand layer section having large particle gaps and large permeability coefficient, the width dimension of the saturated sedimentary deposit 16 formed by the slurry 15 permeating into the sand layer section is smaller (compared with the width dimension of the saturated sedimentary deposit 16' in fig. 2), so that the mud skin 17 can be formed more quickly on the surface of the tank wall and a good retaining wall function can be achieved.

According to the technical scheme, the storage device with the leak-proof agent is placed at the appointed position, so that the storage device can be close to or abutted against the slurry leaking stratum section on the side wall of the groove, and therefore under the action of slurry surge, the additive can be quickly wrapped by the slurry to flow to the slurry leaking stratum section and quickly permeate and block larger particle gaps in the slurry leaking stratum section, and the effects of reducing the slurry leakage amount and reducing the permeation range are achieved. Further, because the leak-proof agent on the storage device can more quickly play a leaking stoppage effect, the slurry can more quickly become static gel in the slurry infiltration range, and a stable soaking deposition layer is formed in the side wall of the groove, then a mud skin is formed on the surface of the side wall of the groove, and further the risk of collapse of the side wall of the groove is reduced. In addition, as the leakage-proof agent on the storage device almost gushes towards the slurry leaking stratum section directionally, the leakage-proof agent can achieve the good leakage-stopping purpose with less investment, thereby obviously reducing the material waste degree of the leakage-proof agent. It is worth mentioning that the technical scheme of the invention is particularly suitable for geological conditions with soft top and hard bottom, and can be widely applied to the construction of soft soil foundation pits, subway deep foundation pits, near-neighbor rail transit or underground continuous walls which are close to other existing protective building foundation pits and are complicated in geological conditions of local and urban centers.

In this embodiment, optionally, the ratio of the particle size of the leak preventer to the particle size of the sand in the slurry leaking formation interval ranges from 0.1 to 0.15. The particle size of the soil and sand in the slurry leaking stratum section is determined according to the actual survey result, so that the particle size of the leak preventer can be practically adapted to the condition of the slurry leaking stratum section in the tank section. Undersize particle size of the leak preventer can not quickly and effectively perform the function of plugging; if the particle size of the leak-proof agent is set to be too large, the leak-proof agent cannot be ensured to smoothly permeate into the inside of the slurry leaking stratum section along with the slurry.

In a second embodiment of the present invention, based on the first embodiment, after step S120, the construction method for preventing the collapse of the wall of the continuous wall by grooving the continuous wall further includes:

and S130, after the bottom wall of the groove section exceeds the slurry leaking stratum section by a preset distance, withdrawing the storage device from the groove section.

Particularly, after the excavation depth of the slot milling machine exceeds the slurry leakage stratum section, the slurry usually enters a clay layer and a stratum, and the slurry does not leak in the stratum sections, so that the leak-proof agent does not need to be put into use aiming at the stratum sections, and the storage device can be withdrawn out of the slot sections in time. And the consumption degree of the leak-proof agent in the storage device is detected, and if the residual amount of the leak-proof agent in the storage device is not enough, the leak-proof agent can be supplemented in time.

In this embodiment, optionally, the preset distance is in a range of 0.5m to 5m, for example, 3m or 4m, so that the leak preventive can penetrate into the slurry leaking formation interval for a more sufficient time, and an error is allowed to exist. Of course, in other embodiments, the predetermined distance may be set to 0, i.e., the storage device is withdrawn as soon as the excavation depth exceeds the interval of the leaking slurry formation; alternatively, the predetermined distance may be set to a negative value, such as-0.3 m, i.e., the excavation position is 0.3m further from the lower boundary of the slurry leaking formation section, and the magazine is ready to be withdrawn.

In the embodiment of the invention, optionally, the specific gravity of the slurry is configured to be 1.05 to 1.15, namely, the water loss of the slurry is configured to be 40ml/h to 60ml/h. It will be appreciated that if the mud weight is too high, the water loss will be high, increasing the risk of the tank sidewall being prone to spalling and disintegration, and if the mud weight is too low, the water pressure within Kong Caoduan will be low, increasing the risk of tank sidewall collapse. And comparing the static soil pressure multiplied by the lateral pressure coefficient with the vertical mud weight to obtain the mud weight required by the weak stratum for guiding field construction. The mud with proper water loss can form thin and compact mud skin on the side wall of the groove, and thick and loose mud skin is avoided, so that the stability of the side wall of the groove is improved. When the depth of the groove is in a slurry leakage stratum section, such as a loose, permeable and poor-stability sand layer, the specific gravity of the slurry is properly increased to increase the viscosity of the slurry, and the pressure balance in the groove section is adjusted and ensured, so that the side wall of the groove is effectively protected.

In order to prevent the collapse of the side wall of the tank, the initial slow excavation is adopted, particularly, the slow footage speed is adopted in the excavation of the soft soil stratum, the specific gravity of the slurry is properly increased, the stable condition of the sand layer retaining wall is checked in time, and the slurry is prepared to ensure the stability of the retaining wall. If the side wall of the groove is locally collapsed, the density of the slurry can be increased, and the collapsed soil body is stirred into fragments and pumped out; if large-area collapse is found, pulling out a milling head of a slot milling machine, backfilling the position 1m to 2m above the collapse position by using high-quality clay (20% of cement is infiltrated), digging the slot after the deposition is compact, and grouting and consolidating by using cement slurry in the range of 4m to 5m below the ground surface if the geological condition is very poor.

After the excavation is finished at the groove section, in order to avoid the problem of the collapse of the side wall of the groove, the reinforcement cage is timely placed down, concrete is poured into the groove 7h of the reinforcement cage, and the problem that the mud is deposited to lose the wall protection effect is avoided. Secondly, when the reinforcement cage enters the groove section, the center of the lifting point must be aligned with the center of the groove section, so that the crane arm does not swing or other influences are not caused to cause the transverse swing of the reinforcement cage, and the side wall of the groove is prevented from collapsing. If the reinforcing cage is difficult to transfer and cannot be forcedly transferred by impact, the reinforcing cage is lifted out again when necessary, and the groove section is retreated and then enters the groove.

The speed is fast when the concrete is poured just beginning, so that the sediment at the bottom of the groove rises along with the surface of the concrete, and the concrete reserves in the storage hoppers in the conduits are reserved. The first batch of concrete is poured sufficiently to have certain impact quantity, so that the slurry can be extruded from the guide pipe; meanwhile, the concrete is continuously poured, and the hourly rising speed of the concrete in the groove section is controlled to be 3m/h to 5m/h so as to finish the concrete pouring before the initial setting of the first batch of concrete. It is worth mentioning that the elevation of the wall top after the underground continuous wall is poured exceeds the designed elevation of the bottom of the top beam of the wall top by 50cm, so as to ensure that loose concrete on the wall top can be completely chiseled off during the subsequent construction of the top beam.

In an embodiment of the construction method for preventing the collapse of the wall of the continuous wall during the grooving process, optionally, the depth of the conduit embedded in the concrete is 3m to 4m during the first concrete pouring process. Understandably, if the embedding depth of the guide pipe is too large, the reinforcement cage is easily supported by mud, and if the embedding depth of the guide pipe is too small, mud is easily extruded into the guide pipe, so that the mud clamping phenomenon of wall concrete occurs. In addition, when every wall section pouring, all establish 2 pouring pipes and pour simultaneously to pipe joint department adopts the airtight circle of rubber to carry out airtightly, so, can effectively avoid the wall body concrete to appear pressing from both sides the mud phenomenon.

Referring to fig. 4, the present invention further provides a storing device 20, wherein the storing device 20 is used in the construction method for preventing the trough wall from collapsing of the continuous wall, specifically, the storing device 20 stores the anti-leaking agent in advance, and when the trough milling machine drills a slurry leaking stratum section, the storing device 20 can be lowered into the trough section. The leak stopping effect can be more quickly achieved through the leak stopping agent on the storage device 20, so that the slurry can be more quickly made into static gel in the slurry permeation range, a stable permeation deposition layer is formed in the side wall of the groove, then a mud skin is formed on the surface of the side wall of the groove, and the risk of collapse of the side wall of the groove is further reduced.

Referring to fig. 4, in an embodiment of the storage device 20 of this embodiment, the storage device 20 includes a first plate section 21 and a second plate section 22 which are opposite to each other, a storage cavity 27 and a slurry inlet 23 are formed between the first plate section 21 and the second plate section 22, the slurry inlet 23 is communicated with the storage cavity 27, a plurality of slurry outlet holes 24 are formed in the second plate section 22, and the slurry outlet holes 24 are disposed near the side wall of the tank. Thus, the space sizes of the slurry inlet 23, the storage cavity 27 and the slurry outlet 24 are ensured through a stable structure, and the leakage-proof agent can move towards the side wall of the tank more smoothly along with the surged slurry. Specifically, the slurry inlet 23 can be arranged at the top end or the bottom end of the storage cavity 27, or at least two slurry inlets 23 are arranged, at least one slurry inlet 23 is arranged at the top end of the storage cavity 27, and at least one slurry inlet 23 is arranged at the bottom end of the storage cavity 27; the slurry inlet 23 can also be used as a filling inlet of a leakage-proof agent. Of course, in other embodiments, it is also possible that the storing device 20 includes a supporting frame and a storing bag, the edge of the storing bag is connected to the supporting frame (i.e. the supporting frame is used to support and flatten the storing bag), the outer surface of the storing bag is provided with a plurality of flow holes, and slurry can enter the storing bag through the flow holes and flow out of the storing bag with the leakage preventive particles in the storing bag and move towards the side wall of the tank.

In this embodiment, optionally, the first plate section 21 is provided with a plurality of slurry inlet holes 25. So, can improve the flow that mud flowed into storage cavity 27 to improve the efficiency that mud carried the leak protection agent and oozes into the cell lateral wall together, and then improved the efficiency that forms on the cell lateral wall and soak sedimentary deposit and mud skin, and reduced the risk of collapsing of cell lateral wall. Of course, in other embodiments, the grout inlet 25 may not be provided in the first plate section 21.

In this embodiment, optionally, the storing device 20 further includes a permeable fabric 26 attached to the first plate section 21, and the permeable fabric 26 at least covers the pulp inlet 25. So, can enough not disturb mud and get into storage cavity 27, can avoid again in storage device 20 the transfer in-process in the groove section, the leak protection agent flows out to the condition of mud via advancing the thick liquid hole 25, promptly, fabric 26 that permeates water can make the leak protection agent have better directive property and flow direction to leak the thick liquid stratum section. It should be noted that the water permeability means that the slurry can normally pass through the water permeable fabric 26 and enter the storage cavity 27, that is, the pore size of the water permeable fabric 26 is larger than the size of the solid particles in the slurry, so as to avoid the problem that the slurry can not normally enter the storage cavity 27 through the slurry inlet 25 because the slurry forms a mud skin on the water permeable fabric 26 rapidly. Of course, in some embodiments, a permeable fabric 26 may also be provided on the slurry inlet 23. In other embodiments, the water permeable fabric 26 may also be absent.

In the present embodiment, optionally, the ratio of the diameter of the slurry outlet 24 to the particle diameter of the leak preventive is configured to be 5 to 15. It can be understood that if the diameter of the grout outlet 24 is set too large, the leak-proof agent can fall out from the grout outlet 24 easily in the filling process or in the moving process of the storage device 20, and if the diameter of the grout outlet 24 is set too small, the leak-proof agent cannot be guaranteed to flow out of the storage cavity 27 smoothly along with the slurry and flow to the grout leaking stratum section.

In this embodiment, optionally, the diameter of the slurry inlet 25 is larger than that of the slurry outlet 24. Therefore, the blockage of the slurry inlet hole 25 to the slurry inflow can be reduced, namely, more kinetic energy is provided when the slurry flows in, so that the leakproof agent can be more fully wrapped to flow to the slurry leaking stratum section. It is worth mentioning that in the embodiment where the storage device 20 is provided with the water-permeable fabric 26, the diameter of the slurry inlet 25 can be made larger than that of the slurry outlet 24 because the water-permeable fabric 26 covers the slurry inlet 25.

The invention also provides a slot milling machine which comprises a lifting frame, a milling head arranged at the lower end of the lifting frame and the storage device, wherein the storage device is connected to the lifting frame in a sliding manner along the vertical direction. The concrete structure of the material storage device refers to the above embodiments, and as the slot milling machine adopts all the technical schemes of all the above embodiments, the slot milling machine at least has all the beneficial effects brought by the technical schemes of the above embodiments, and further description is omitted.

Specifically, in an embodiment of the slot milling machine, the slot milling machine includes two milling heads, the two milling heads are distributed on a lifting frame along a first direction, the lifting frame has a first side and a second side distributed along a second direction, the second direction intersects with or is perpendicular to the first direction, at least two storage devices are provided, at least one storage device is provided on the first side, and at least one storage device is provided on the second side. Thus, the groove side walls on two opposite long sides of the groove section are at least penetrated more quickly by the leakage preventive, thereby playing a rapid and good wall protection role for the two long-side groove side walls which are more prone to collapse. Of course, in other embodiments, the storage devices may also be correspondingly arranged on the groove side walls on two opposite short sides of the groove section.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A construction method for preventing the collapse of a groove wall in the grooving of a continuous wall is characterized by comprising the following steps:

and placing a storage device into the tank section, and enabling the storage device to be adjacent to or abutted against the slurry leaking stratum section on the side wall of the tank, so that the leakage-proof agent on the storage device at least partially permeates into the slurry leaking stratum section along with the slurry.

2. The construction method for preventing the collapse of the groove wall of the continuous wall according to claim 1, wherein the construction method for preventing the collapse of the groove wall of the continuous wall further comprises:

and when the bottom wall of the tank section exceeds the slurry leaking stratum section by a preset distance, withdrawing the storage device from the tank section.

3. The construction method for preventing the collapse of the wall of the continuous wall in the grooving process, according to claim 2, wherein the preset distance is in a range of 0.5m to 5m.

4. The method for preventing collapse of a wall of a continuous wall according to claim 1, wherein the slurry has a specific gravity of 1.05 to 1.15;

and/or the water loss amount of the mud is configured to be 40ml/h to 60ml/h.

5. A storage device for the construction method for preventing the tank wall from collapsing of the continuous wall as claimed in any one of claims 1 to 4, wherein the storage device is provided with a storage cavity, a slurry inlet and a slurry outlet which are communicated, the storage cavity is used for storing leak-proof agents, and the slurry inlet and the slurry outlet are used for circulating slurry, so that the leak-proof agents at least partially follow the slurry to seep into the slurry-leaking stratum section of the side wall of the tank.

6. The storage device as claimed in claim 5, wherein the storage device comprises a first plate section and a second plate section which are opposite to each other, the storage chamber and the slurry inlet are formed between the first plate section and the second plate section, the slurry outlet is located on the second plate section, and the slurry outlet is arranged close to the side wall of the tank.

7. The storing device according to claim 6, characterized in that the first plate section is provided with a plurality of slurry inlet holes.

8. The storage device as claimed in claim 7, wherein the storage device further comprises a water-permeable fabric attached to the first plate section, and the water-permeable fabric at least covers the slurry inlet hole.

9. The storage device as claimed in claim 5, wherein the slurry inlet is provided with at least two slurry inlets, at least one slurry inlet is positioned at the top end of the storage cavity, and at least one slurry inlet is positioned at the bottom end of the storage cavity;

and/or the ratio of the diameter of the slurry outlet hole to the particle size of the leakage preventive is configured to be 5-15.

10. A slot milling machine, characterized in that the slot milling machine comprises a lifting frame, a milling head arranged at the lower end of the lifting frame, and the storage device as claimed in any one of claims 5 to 9, wherein the storage device is connected to the lifting frame in a sliding manner along the vertical direction.