CN115324031B

CN115324031B - Construction method for preventing groove wall collapse during continuous wall grooving, storage device and groove milling machine

Info

Publication number: CN115324031B
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: 2024-06-18
Anticipated expiration: 2042-08-16
Also published as: CN115324031A

Abstract

The invention discloses a construction method for preventing groove wall collapse of a continuous wall from forming grooves, a storage device and a groove milling machine, wherein the construction method for preventing groove wall collapse of the continuous wall from forming grooves comprises the following steps: digging a groove section through a groove milling machine, and pouring slurry into the groove section; and placing a storage device into the trough section, and enabling the storage device to be adjacent to or abutted against a slurry leakage stratum section on the side wall of the trough so that a leakage-proof agent on the storage device at least partially follows the slurry to permeate into the slurry leakage stratum section. The technical scheme of the invention can reduce the risk of collapse of the side wall of the groove in the process of forming the groove 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 underground diaphragm wall construction, in particular to a diaphragm wall grooving construction method for preventing groove wall collapse, a storage device and a groove milling machine.

Background

In the process of forming grooves in the underground diaphragm wall, the wall protection effect of slurry is generally utilized to prevent the side wall of the groove of the underground diaphragm wall from collapsing or peeling, so as to maintain the shape of the side wall of the dug groove unchanged. However, due to the influences of various geological conditions, grooving process and other factors, the problem of groove side wall collapse can often occur during grooving construction, so that after the concrete of the underground continuous wall is poured, the concrete with the exposed surface of the foundation pit excavated is protruded to influence the subsequent structural construction.

Disclosure of Invention

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

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

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

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

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

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

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

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

The invention also provides a storage device for the construction method for preventing the wall collapse 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 a leakage-proof agent, and the slurry inlet and the slurry outlet are used for circulating slurry so that the leakage-proof agent at least partially penetrates into the slurry leakage stratum section along with the slurry.

Optionally, the storage device comprises a first plate section and a second plate section which are opposite, the storage cavity and the slurry inlet are formed between the first plate section and the second plate section, the slurry outlet is positioned in the second plate section, and the slurry outlet is close to the side wall of the groove.

Optionally, the first plate section is provided with a plurality of pulp 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.

Optionally, the pulp inlet is provided with at least two pulp inlets, at least one pulp inlet is positioned at the top end of the storage cavity, and at least one pulp inlet is positioned at the bottom end of the storage cavity.

Optionally, the ratio of the diameter of the slurry outlet hole 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 with the lifting frame in a sliding manner along the up-down direction.

According to the technical scheme, the leakage-preventing agent on the storage device can be used for rapidly achieving a leakage-stopping effect, so that slurry can be rapidly formed into static gel within a slurry infiltration range, a stable saturated deposition layer is formed in the side wall of the groove, mud skin is formed on the surface of the side wall of the groove, and the collapse risk of the side wall of the groove is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic flow chart of an embodiment of a method for constructing a continuous wall trough to prevent collapse of the trough wall;

FIG. 2 is a schematic illustration of a prior art structure of a saturated deposit and mud skin produced by a slurry retaining wall on a side wall of a tank;

FIG. 3 is a schematic diagram of the structure of a saturated deposit and mud skin generated by the action of mud retaining walls on the side walls of a trough after the construction method of the invention for preventing the collapse of the trough walls of the trough is applied;

Fig. 4 is a schematic structural diagram of an embodiment of a storage device according to the present invention.

Reference numerals illustrate:

(a) Prior art

Reference numerals	Name of the name	Reference numerals	Name of the name
				11＇	Guide wall	15＇	Slurry
12＇	Powder soil layer	16＇	Impregnating the deposited layer
				13＇	Sand layer	17＇	Mud skin
14＇	Clay layer	18＇	Trough section

(B) The technical proposal of the invention

Reference numerals	Name of the name	Reference numerals	Name of the name
				11	Guide wall	20	Material storage device
12	Powder soil layer	21	First plate section
				13	Sand layer	22	Second plate section
14	Clay layer	23	Slurry inlet
				15	Slurry	24	Slurry outlet
16	Impregnating the deposited layer	25	Pulp inlet
				17	Mud skin	26	Water permeable fabric
18	Trough section	27	Storage cavity

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "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 a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

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

step S110, excavating a groove section by 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 protecting walls, carrying slag, cooling and lubricating in the process of forming grooves in the underground diaphragm wall, wherein the slag carrying means that the slurry with viscosity can suspend soil slag generated in groove forming construction, so that the soil slag carried by the slurry is conveniently discharged during the circulation of the slurry; cooling and lubricating means that the slurry can not only timely take away heat generated by the milling head of the slot milling machine during excavation, but also lubricate the milling head to reduce abrasion. Referring to fig. 2, the retaining wall action of the slurry 15 'refers to the action of stabilizing the side wall of the tank, and firstly, the hydrostatic pressure of the slurry 15' resists the soil pressure and the water pressure acting on the side wall of the tank and prevents infiltration of groundwater; second, the slurry 15 ' is able to form a water impermeable skin 17 ' on the surface of the tank side walls and to keep the hydrostatic pressure of the slurry 15 ' acting on the tank side walls continuously and effectively while preventing spalling of the tank side walls; furthermore, the slurry 15 'penetrates from the surface of the side wall of the tank into the stratum to a certain extent and then adheres to soil particles in the penetration range, namely, the slurry 15' penetrates into the stratum pores to become static gel, the gelled slurry 15 'fixes the relative positions of the soil particles, and a stable permeable sedimentary layer 16' is formed in the side wall of the tank, so that the collapse risk and water permeability of the side wall of the tank can be reduced. It will be appreciated that embodiments of the present invention provide for stabilizing the trough side walls primarily by mud 15' to prevent collapse of the trough side walls. It should be noted that, in the grooving construction, the liquid level of the slurry 15 ' should be guaranteed to be higher than the ground water level by more than 1m, and simultaneously higher than the bottom surface of the guide wall 11 ' by more than 0.5m, and the liquid level condition of the slurry 15 ' is monitored regularly, if the slurry 15 ' is found to be lost, the slurry needs to be supplemented in time, so as to guarantee the wall protection effect of the slurry 15 '.

In this embodiment, the slurry used for filling the tank section is optionally configured as bentonite slurry, so as to perform a good wall protection function on the side wall of the tank, and the main components thereof include bentonite, water and additives, and the conventional additives include dispersing agents (such as sodium carbonate, i.e. soda), tackifiers (such as carboxymethyl cellulose), weighting agents (such as barite) and the like. Of course, in other embodiments, polymer, brine or CMC (Carboxymethyl Cellulose ) slurries, etc. may also be used as the slurry.

In this embodiment, further optionally, the raw materials of the bentonite slurry may be mixed 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 mud proportion is determined through experiments according to specific stratum soil conditions, and the fully stirred mud is used after being swelled in a mud storage tank for 24 hours, so that bentonite is strictly forbidden to be directly poured into a groove section for pulping. It should be noted that, since CMC solution may prevent bentonite from swelling, water is required to be mixed with bentonite before CMC solution is added during slurry mixing.

And step S120, placing a storage device into the groove section, and enabling the storage device to be adjacent to or abutted against a slurry leakage stratum section on the side wall of the groove so that a leakage-proof agent on the storage device at least partially follows the slurry to permeate into the slurry leakage stratum section.

Referring to fig. 2, when the underground diaphragm wall is constructed by grooving, the side walls of the groove are generally longitudinally provided with strata with different geological properties, for example, a silty layer 12 ', a sand layer 13' and a clay layer 14 'which are sequentially arranged from top to bottom, and when the slurry 15' permeates into the stratum in a sand layer section with large particle gaps and large water permeability coefficient, a large permeation range (shown as the width dimension of a permeation sediment layer 16 'in fig. 2) appears, that is, the seepage time and seepage flow of the slurry 15' are obviously increased. It will be appreciated that a slurry-leaking interval refers to an interval in which the amount of slurry 15' leakage is large, such as a gravel layer, a crushed stone layer, etc. Without loss of generality, it is generally chosen to incorporate a leakage preventing agent such as sawdust, straw powder, etc. during the mixing preparation of the slurry 15 ', to block larger particle gaps in the leakage-slurry layer section by means of the leakage preventing agent, thereby preventing the slurry 15' from leaking and achieving the purpose of plugging. It will be appreciated that the slurry 15 ' in the trough section 18 ' is continuously flung and displaced, and truly follows the slurry 15 ' to infiltrate into the leakage preventing agent in the leakage preventing layer section, and the proportion of the leakage preventing agent is very small, so that the leakage preventing agent cannot quickly reach the layer section with leakage stopping requirement, and large particle gaps cannot be blocked in time, and a great amount of material waste of the leakage preventing agent is caused.

Referring to fig. 3, the geological properties of the excavated trench section 18 of the present invention are set to be the same as those of the prior art, that is, the trench sidewall structure includes the guide wall 11, the silty layer 12, the sand layer 13 and the clay layer 14, and in the sand layer section having a large grain gap and a large water permeability coefficient, the width dimension of the impregnated deposition layer 16 formed by the slurry 15 penetrating into the layer section is smaller (compared with the width dimension of the impregnated deposition layer 16' in fig. 2), so that the mud 17 can be formed on the trench wall surface more quickly and a good wall protection effect can be achieved.

According to the technical scheme, the storage device stored with the leakage-proof agent is lowered to the designated position, so that the storage device can be adjacent to or abutted against the leakage-proof stratum on the side wall of the groove, and therefore under the action of slurry surge, the additive can be rapidly wrapped by slurry to flow to the leakage-proof stratum and rapidly infiltrate into and block larger particle gaps in the leakage-proof stratum, and the effects of reducing slurry leakage and a permeation range are achieved. Further, as the leakage-proof agent on the storage device can play a role in plugging more quickly, slurry can be made into static gel in a slurry infiltration range more quickly, a stable saturated deposition layer is formed in the side wall of the groove, and then mud skin is formed on the surface of the side wall of the groove, so that the collapse risk of the side wall of the groove is reduced. In addition, the leakage preventing agent on the storage device is almost directionally shoved to the leakage slurry stratum, so that the good leakage blocking purpose can be achieved with a small input amount of the leakage preventing agent, and the material waste degree of the leakage preventing agent can be remarkably reduced. It is worth mentioning that the technical scheme of the invention is particularly suitable for geological conditions of upper softness and lower hardness, and can be widely applied to construction of underground continuous walls with complex geological conditions of soft foundation pits, subway deep pits, adjacent rail transit or other nearby existing protection building pits and ground centers.

In this embodiment, optionally, the ratio of the particle size of the leakage preventing agent to the particle size of the soil and sand in the leakage layer section is in the range of 0.1 to 0.15. The particle size of the soil sand in the leakage stratum section is determined according to actual survey results, so that the particle size of the leakage-proof agent can be practically adapted to the situation of the leakage stratum section in the tank section. Understandably, if the particle size of the leakage-proof agent is too small, the leakage-proof agent cannot quickly and effectively play a role in leaking stoppage; if the particle size of the leakage-proof agent is too large, the leakage-proof agent cannot be ensured to smoothly permeate into the leakage-proof layer section along with the mud.

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

And step S130, when the bottom wall of the groove section exceeds the preset distance of the slurry leakage stratum section, withdrawing the storage device from the groove section.

Specifically, when the excavation depth of the slot milling machine exceeds the slurry leakage stratum, clay layers and strata can be generally entered, and slurry cannot leak out of the stratum, so that a leakage-proof agent does not need to be put into the stratum, and a storage device can be timely withdrawn from the stratum. And detecting the consumption degree of the leakage-proof agent in the storage device, and if the residual amount of the leakage-proof agent in the storage device is insufficient, timely replenishing the leakage-proof agent.

In this embodiment, optionally, the preset distance is in a range of 0.5m to 5m, for example 3m or 4m, so that the leakage preventing agent can penetrate into the leakage-preventing layer section for a more sufficient time, and the error is allowed. 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 slurry-leaking interval; alternatively, the predetermined distance is set to a negative value, for example, -0.3m, i.e. the excavation site is further 0.3m from the lower boundary of the slurry leaking interval, ready to withdraw the magazine.

In an embodiment of the invention, optionally, the specific gravity of the slurry is configured to be 1.05 to 1.15, that is, the water loss of the slurry is configured to be 40ml/h to 60ml/h. It can be appreciated that if the specific gravity of the slurry is too high, the water loss is high, which increases the risk of easy spalling and disintegration of the side walls of the tank, and if the specific gravity of the slurry is too low, the water pressure in the hole tank section is small, which increases the risk of collapse of the side walls of the tank. The slurry specific gravity required by the weak stratum can be obtained by multiplying the static soil pressure by the side pressure coefficient and comparing the side pressure coefficient with the vertical slurry gravity, so as to be used for guiding site construction. Slurry 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 formed groove is in a slurry leakage stratum section, such as a loose and permeable sand layer with poor stability, 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 regulated and ensured, so that the side wall of the groove is effectively protected.

In order to prevent the phenomenon of collapse of the side wall of the groove, initial slow excavation is adopted, particularly, a slower footage speed is adopted in the excavation of a soft soil stratum, the specific gravity of mud is properly increased, the stability of the sand layer retaining wall is checked in time, and the mud is blended to ensure the stability of the retaining wall. If partial collapse of the side wall of the groove occurs, the slurry density can be increased, and the collapsed soil body is stirred into fragments to be extracted; if the collapse of a large area is found, a milling head of a milling machine is started, high-quality clay (infiltrated with 20% cement) is backfilled to a position 1m to 2m above the collapse, the milling machine is further grooved after the deposition is compact, and if the geological condition is very bad, cement slurry can be used for grouting and consolidation in the range of 4m to 5m below the ground surface.

After the groove section is excavated, in order to avoid the problem of collapse of the side wall of the groove, the reinforcement cage should be timely lowered, and the reinforcement cage should be poured into the groove 7h for concrete, so as to avoid the problem that mud is precipitated and the wall protection effect is lost. Secondly, when the steel reinforcement cage enters the groove section, the center of the hanging point must be aligned with the center of the groove section, and the transverse swing of the steel reinforcement cage is avoided due to the fact that the crane boom swings or other influences are avoided, so that the side wall of the groove is prevented from collapsing. If the reinforcement cage is difficult to put down and can not be forcibly impacted down, the reinforcement cage is lifted up again when necessary, and the groove section is re-treated and then put into the groove.

Wherein, the speed is fast when the concrete is just poured, so that the sediment at the bottom of the tank rises along with the surface of the concrete, and the concrete reserves are stored in the storage hopper in each guide pipe. The first filling concrete amount is enough to ensure that the first filling concrete has a certain impact amount, and mud can be extruded from the guide pipe; meanwhile, the continuous casting of the concrete is kept, and the rising speed of the concrete in the trough section per hour is controlled to be 3-5 m/h so as to be finished before the initial setting of the first concrete. It should be noted that the elevation of the wall top after the casting of the underground continuous wall should exceed the design elevation of the crown beam bottom of the wall top by 50cm, so as to ensure that loose concrete on the wall top can be completely chiseled out during the subsequent crown beam construction.

In an embodiment of the method for constructing a diaphragm wall trough to prevent the collapse of the trough wall, optionally, the depth of the conduit embedded into the concrete is 3m to 4m in the process of first filling the concrete. It can be understood that if the depth of the conduit is too large, the reinforcement cage is easily supported by the slurry, and if the depth of the conduit is too small, the slurry is easily extruded into the conduit, so that the wall concrete is clamped. In addition, when every wall section is poured, 2 pouring pipes are arranged for simultaneous pouring, and the pipe joint is sealed by adopting a rubber sealing ring, so that the phenomenon of mud clamping of wall concrete can be effectively avoided.

Referring to fig. 4, the present invention further provides a storage device 20, where the storage device 20 is used in the construction method for preventing the wall collapse of the continuous wall forming groove, specifically, the storage device 20 stores the leakage-preventing agent in advance, and when the milling machine digs to the slurry leakage layer section, the storage device 20 can be lowered into the groove section. The leakage-preventing agent on the storage device 20 can have a leakage-preventing effect more quickly, so that slurry can be made into static gel in a slurry infiltration range more quickly, a stable saturated deposition layer is formed in the side wall of the tank, and then mud skin is formed on the surface of the side wall of the tank, so that the collapse risk of the side wall of the tank is reduced.

Referring to fig. 4, in an embodiment of the storage device 20 of the present embodiment, the storage device 20 includes a first plate segment 21 and a second plate segment 22 that are opposite, a storage cavity 27 and a slurry inlet 23 are formed between the first plate segment 21 and the second plate segment 22, the slurry inlet 23 is communicated with the storage cavity 27, and a plurality of slurry outlets 24 are formed in the second plate segment 22, and the slurry outlets 24 are disposed near the side wall of the tank. Thus, the space dimensions of the slurry inlet 23, the storage cavity 27 and the slurry outlet 24 are ensured through a stable structure, so that the leakage-proof agent can more smoothly follow the surging slurry to move towards the side wall of the tank. Specifically, the slurry inlet 23 may be disposed at the top end or the bottom end of the storage cavity 27, or at least two slurry inlets 23 are disposed on the slurry inlet 23, at least one slurry inlet 23 is disposed at the top end of the storage cavity 27, and at least one slurry inlet 23 is disposed at the bottom end of the storage cavity 27; the slurry inlet 23 may also act as a filler inlet for the leakage preventive. Of course, in other embodiments, the storage device 20 may further include a support frame and a storage bag, where the edge of the storage bag is connected to the support frame (i.e., the support frame opens and flattens the storage bag), and the outer surface of the storage bag is provided with a plurality of flow holes, so that slurry can enter the storage bag through the flow holes and carry leakage-preventing agent particles in the storage bag out of the storage bag and move toward the side wall of the tank.

In this embodiment, optionally, the first plate section 21 is provided with a plurality of pulp inlet holes 25. Thus, the flow rate of the slurry flowing into the storage cavity 27 can be increased, so that the efficiency of the slurry carrying the leakage-proof agent to permeate into the side wall of the groove is increased, the efficiency of forming a saturated deposit layer and mud skin on the side wall of the groove is further increased, and the collapse risk of the side wall of the groove is reduced. Of course, in other embodiments, the pulp inlet holes 25 may not be provided on the first plate section 21.

In this embodiment, optionally, the storage device 20 further includes a water permeable fabric 26 attached to the first plate segment 21, where the water permeable fabric 26 covers at least the pulp inlet 25. In this way, the leakage preventing agent can not interfere with the slurry entering the storage cavity 27, but can also be prevented from flowing out to the slurry through the slurry inlet holes 25 in the descending process of the storage device 20 in the trough section, that is, the permeable fabric 26 can enable the leakage preventing agent to have better directivity and flow to the slurry leakage 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 rapidly forms a mud skin on the water permeable fabric 26, and the slurry cannot normally enter the storage cavity 27 through the slurry inlet holes 25. Of course, in some embodiments, a water permeable fabric 26 may also be provided on the pulp inlet 23. In other embodiments, water permeable fabric 26 may not be provided.

In this embodiment, alternatively, the ratio of the diameter of the pulp outlet 24 to the particle diameter of the leakage preventive is configured to be 5 to 15. It will be appreciated that if the diameter of the grout outlet 24 is too large, the leakage preventing agent will easily drop out from the grout outlet 24 during the filling process or during the moving process of the storage device 20, and if the diameter of the grout outlet 24 is too small, the leakage preventing agent cannot be ensured to smoothly follow the slurry to flow out of the storage cavity 27 and flow to the leakage stratum.

In this embodiment, optionally, the diameter of the pulp inlet 25 is larger than the diameter of the pulp outlet 24. In this way, the disturbance of the slurry inlet 25 to the flow of slurry, that is, the greater kinetic energy of the slurry flowing into the slurry inlet, can be reduced, and the leakage preventing agent can be more sufficiently entrained in the leakage preventing agent flowing into the slurry leakage layer section. It should be noted that, in the embodiment where the storage device 20 is provided with the permeable fabric 26, since the permeable fabric 26 covers the pulp inlet 25, the diameter of the pulp inlet 25 may be made larger and may be much larger than the diameter of the pulp outlet 24.

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 with the lifting frame in a sliding manner along the up-down direction. The specific structure of the storage device refers to the above embodiments, and because the slot milling machine adopts all the technical schemes of all the embodiments, the slot milling machine has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.

Specifically, in an embodiment of the slot milling machine of the present invention, the slot milling machine has 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 is intersected with or 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 side walls of the two opposite long sides of the groove section can be at least penetrated more quickly by the leakage-proof agent, thereby playing a rapid and good role in protecting the side walls of the two long sides of the groove which are more prone to collapse. Of course, in other embodiments, the side walls of the trough on two opposite short sides of the trough section may also be correspondingly provided with storage means.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. The construction method for preventing the wall collapse of the continuous wall grooving is characterized by comprising the following steps of:

Placing a storage device into the trough section, and enabling the storage device to be adjacent to or abutted against a slurry leakage stratum section on the side wall of the trough so that a leakage-proof agent on the storage device at least partially follows the slurry to permeate into the slurry leakage stratum section;

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 a leakage-proof agent, and the slurry inlet and the slurry outlet are used for allowing slurry to circulate so that the leakage-proof agent at least partially follows the slurry to permeate into a slurry leakage stratum section of the side wall of the tank; the storage device comprises a first plate section and a second plate section which are opposite to each other, the storage cavity and the slurry inlet are formed between the first plate section and the second plate section, the slurry outlet is positioned in the second plate section, and the slurry outlet is arranged close to the side wall of the groove; the slurry inlet is positioned at the top end and/or the bottom end of the storage cavity.

2. The method for constructing a trough wall collapse prevention for a continuous wall according to claim 1, wherein the method for constructing a trough wall collapse prevention for a continuous wall further comprises:

and after the bottom wall of the groove section exceeds the preset distance of the slurry leakage stratum section, withdrawing the storage device from the groove section.

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

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

And/or the water loss of the slurry is configured to be 40ml/h to 60ml/h.

5. A storage device for the construction method of continuous wall grooving and groove wall collapse prevention according to any one of claims 1 to 4, characterized in that 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 a leakage-proof agent, the slurry inlet and the slurry outlet are used for circulating slurry so that the leakage-proof agent at least partially follows the slurry to permeate into a slurry leakage stratum section of a groove side wall;

The storage device comprises a first plate section and a second plate section which are opposite to each other, the storage cavity and the slurry inlet are formed between the first plate section and the second plate section, the slurry outlet is positioned in the second plate section, and the slurry outlet is arranged close to the side wall of the groove;

The slurry inlet is positioned at the top end and/or the bottom end of the storage cavity.

6. The storage device of claim 5, wherein the first plate section is provided with a plurality of pulp inlet holes.

7. The storage device of claim 6, further comprising a water permeable fabric attached to the first plate segment, the water permeable fabric covering at least the pulp inlet.

8. The storage device according to claim 5, wherein at least two pulp inlets are arranged, at least one pulp inlet is positioned at the top end of the storage cavity, and at least one pulp inlet is positioned at the bottom end of the storage cavity;

And/or the ratio of the diameter of the slurry outlet to the particle diameter of the leakage preventive is configured to be 5 to 15.

9. 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 8, wherein the storage device is connected with the lifting frame in a sliding manner along the up-down direction.