CN112707692A

CN112707692A - Cutting fluid for TRD construction, preparation method and construction method

Info

Publication number: CN112707692A
Application number: CN202110014726.0A
Authority: CN
Inventors: 胡宝山; ***; 刘长伟; 刘涛
Original assignee: SHANGHAI ZHIPING FOUNDATION ENGINEERING CO LTD
Current assignee: SHANGHAI ZHIPING FOUNDATION ENGINEERING CO LTD
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-04-27
Anticipated expiration: 2041-01-06
Also published as: CN112707692B

Abstract

The embodiment of the invention discloses a cutting fluid for TRD construction, a preparation method and a construction method, wherein components of bentonite, a foaming agent, silicon powder, perlite, calcium chloride and water are mixed and stirred in proportion to prepare the cutting fluid, the cutting fluid is injected into a groove to form a continuous wall when the groove is formed on the continuous wall for the first time, the continuous wall can be cast in place for construction and then is replaced with cement, the purpose of forming the continuous wall by using a large amount of cement slurry can be achieved by using a small amount of cutting fluid, the cement waste and the volume of replaced soil at the later stage are reduced, and the trouble caused by transporting the replaced soil is reduced.

Description

Cutting fluid for TRD construction, preparation method and construction method

Technical Field

The embodiment of the invention relates to the technical field of building construction, in particular to cutting fluid for TRD construction, a preparation method and a construction method.

Background

The TRD method is a construction process that a cutting box which meets the design depth and is attached with a cutting chain and a cutter head is inserted into the ground, cement paste is injected into the ground while longitudinal cutting and transverse pushing are carried out to form a groove so as to achieve the purpose of fully mixing and stirring with an original ground, and a continuous wall with the same thickness is formed underground.

In the TRD construction method in the prior art, cement slurry is directly injected into a trough to form an underground continuous wall. And reinforcing the underground continuous wall by injecting cement grout for the second time. However, when the cement slurry injected for the second time is replaced with the cement slurry injected for the first time, a large amount of cement is wasted, and the volume of the replaced cement slurry is too large, which causes a problem of difficulty in storage. If the groove is reinforced by injecting the cutting fluid for the first time, the ratio of the foaming agent in different cutting fluids can generate an expansion coefficient which cannot be realized, so that the foaming capacity and the expansion volume are unstable.

Disclosure of Invention

The invention aims to provide a cutting fluid for TRD construction, a preparation method and a construction method. The TRD construction method adopts the cutting fluid with the foaming agent when the first grooving and fixing are carried out, the cutting fluid is foamed and expanded in the guide groove for forming, the purpose of forming the continuous wall by using a large amount of cement slurry can be achieved even by using a small amount of cutting fluid, the cement waste and the volume of later-stage replacement soil are reduced, and the trouble caused by conveying the replacement soil is reduced.

The embodiment of the invention provides a cutting fluid for TRD construction, which comprises the following components: 50-70 parts of bentonite, 1-4 parts of foaming agent, 15-30 parts of silicon powder, 15-20 parts of perlite, 15-25 parts of calcium chloride and 85-90 parts of water.

According to the invention, the bentonite, the foaming agent, the silicon powder, the perlite, the calcium chloride and the water are mixed and stirred, so that the cutting fluid which has good expansion performance, strong foaming capacity, effective dispersion pressure, light weight and durability is formed, and the problems of large deformation, low expansion degree, unstable foaming capacity and uneven mixing of the existing cutting fluid due to temperature and dryness and wetness are solved.

In one possible embodiment, the foaming agent of the cutting fluid comprises the following raw materials: 1-3 parts of sodium hydroxide, 2-6 parts of bone glue, 1-1.3 parts of triethanolamine and 2-4 parts of hoof and horn powder. Specifically, the raw material composition of the foaming agent is described.

In one possible embodiment, the cutting fluid further comprises: 1-3 parts of reinforcing fiber;

the reinforced fiber is carbon fiber or basalt fiber. The addition of reinforcing fibers can improve the corrosion resistance and durability of the material.

The embodiment of the invention provides a preparation method of cutting fluid, which comprises the following steps:

A. weighing the following components in proportion: 50-70 parts of bentonite, 1-4 parts of foaming agent, 15-30 parts of silicon powder, 15-20 parts of perlite, 15-25 parts of calcium chloride, 85-90 parts of water, 1-3 parts of sodium hydroxide, 2-6 parts of bone glue, 1-1.3 parts of triethanolamine, 2-4 parts of hoof and horn powder and 1-3 parts of reinforcing fiber;

B. adding said sodium hydroxide to said water;

C. heating the solution to 50-70 deg.C;

D. adding the bone glue and stirring;

E. adding the hoof and horn powder and the triethanolamine, and stirring to obtain a foaming agent;

F. putting the water into a stirrer, adding the bentonite, the silicon powder, the perlite, the calcium chloride and the reinforced fibers into a pot, uniformly stirring, and then adding a foaming agent for mixing and stirring;

G. the speed of the stirrer is controlled at 1500-1700 rpm, the stirring time is controlled at 25-40 minutes, and the cutting fluid is obtained after uniform stirring.

The cutting fluid prepared by the steps has expansibility and a high expansion coefficient, and solves the problems of low expansibility and small deformation of the conventional cutting fluid.

The embodiment of the invention provides a construction method of cutting fluid, which comprises the following steps:

s1, driving the cutting box into the guide groove by the excavator, and transversely excavating;

s2, injecting cutting fluid through a host;

s3, replacing the cutting fluid in the groove with cement through a host machine;

and S4, inserting H-shaped steel to form the rigid retaining wall.

The method comprises the following steps of pouring the underground continuous wall, so that the underground continuous wall has integrity, and the continuous wall space poured as the same as cement grout with larger volume can be obtained through cutting fluid with smaller volume, so that the problem of waste of the existing cement is solved.

In a possible embodiment, the step S1 of the construction method of the cutting fluid further includes:

s101, excavating a guide groove by an excavator, and placing the guide groove into a pre-buried box;

s102, placing the end part cutting box into a pre-buried box;

s103, moving the main machine, and assembling the cutting box and the chain;

and S104, after all the drills are drilled, putting the drill bit into an inclinometer, wherein the verticality is not more than 1 percent, and the wall deviation is not more than 50 mm.

The verticality detection is carried out on the guide groove, and the problem that the guide groove is not flat in subsequent construction due to the fact that the cutting box deviates in the advancing process is solved.

In a possible embodiment, the step S2 of the construction method of the cutting fluid further includes:

s201, rotating the chain type cutter in the process of injecting the cutting fluid, and further mixing and stirring;

and S202, after the grooving of one section is finished, withdrawing the cutting box to the cutting starting point, and performing withdrawal excavation.

The cutting fluid is injected twice, and the cutting fluid is continuously stirred in the injection process, so that the cutting fluid is mixed more uniformly.

In a possible embodiment, the step S3 of the construction method of the cutting fluid further includes:

s301, the cutting box is withdrawn to the cutting initial point to replace cement slurry;

s302, injecting the cement slurry through a grouting pump;

s303, keeping the wall forming process at 40-50 mm/min.

And replacing the cutting fluid with the cement, fixing the diaphragm wall through the cutting fluid, and adding the cement again to form the underground diaphragm wall with better fixity.

In a possible embodiment, the step S302 of the construction method of the cutting fluid further includes:

and S3021, setting the grouting pressure of the grouting pump to be 0.5-1.5 Mpa.

And the grouting pressure is controlled, so that the cement is prevented from being distributed unevenly in the grouting process, and the strength of the continuous wall is reduced.

In a possible embodiment, the step S4 of the construction method of the cutting fluid includes:

s401, pulling out the cutting box;

s402, soil replacement treatment;

s403, the compressive strength of the wall-forming rear through hole core-taking test block is 0.89-1.16 MPa.

And (4) carrying out compression resistance detection to verify the strength of the continuous wall and knowing whether the strength of the continuous wall meets the requirement.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships and are used merely for convenience in describing and simplifying the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication connection; either directly or indirectly through intervening media, either 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. The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

As described in the background of the present application, the TRD method of the related art forms an underground diaphragm wall by directly injecting cement slurry into a trough, and reinforces the underground diaphragm wall by the cement slurry. The inventors of the present application found that the cutting fluid has a low expansion coefficient and still fails to reach a predetermined foaming volume after the addition of a foaming agent. In addition, in the TRD method, cement is wasted by performing cement slurry replacement twice, and the cost for transporting cement in the later period is too high.

In order to solve the above problems, the inventor of the present application proposes a technical solution of the present application, and specific embodiments are as follows:

example one

The invention provides a technical scheme that: the components of the cutting fluid for TRD construction, the preparation method and the construction method comprise: 50 parts of bentonite, 1 part of foaming agent, 15 parts of silicon powder, 15 parts of perlite, 15 parts of calcium chloride and 85 parts of water.

It is found that the cutting fluid of the present invention is formed by mixing and stirring the components of bentonite, foaming agent, water, silica powder, perlite and calcium chloride, and has good expansion performance, effective dispersion pressure, light weight and durability, and the TRD method uses the cutting fluid with foaming agent when performing the first grooving and fixing, and the cutting fluid is foamed and expanded in the guide groove, so that the purpose of forming a continuous wall with a large amount of cement slurry can be achieved even with a small amount of cutting fluid, thereby reducing cement waste and the volume of post-replacement soil, and reducing the trouble caused by transporting the replacement soil.

Optionally, in this embodiment, the raw material composition of the foaming agent includes: 1 part of sodium hydroxide, 2 parts of bone glue, 1 part of triethanolamine and 2 parts of hoof and horn powder.

Optionally, in this embodiment, 1 part of a reinforcing fiber is further included, where the reinforcing fiber is a carbon fiber. The preparation method of the cutting fluid comprises the following steps:

A. respectively weighing 50 parts of bentonite, 1 part of foaming agent, 15 parts of silicon powder, 15 parts of perlite, 15 parts of calcium chloride, 85 parts of water, 1 part of sodium hydroxide, 2 parts of bone glue, 1 part of triethanolamine, 2 parts of hoof horn powder and 1 part of reinforcing fiber by corresponding weight;

B. weighing water, and adding sodium hydroxide into the water;

C. heating the solution to 50-70 ℃;

D. adding bone glue and stirring;

E. adding hoof and horn powder and triethanolamine, and stirring to obtain a foaming agent;

F. putting water into a stirrer, adding bentonite, silicon powder, perlite, calcium chloride and reinforcing fiber into the stirrer, uniformly stirring, adding a foaming agent, and mixing and stirring;

The construction method of the deep underground diaphragm wall by using the cutting fluid comprises the following steps:

and S1, driving the excavator into a cutting box, and performing transverse excavation. The excavator excavates a guide groove, the pre-buried box is placed into the pre-buried hole through the crawler crane, the end cutting box is placed into the pre-buried box, the pre-buried box is fixed through the supporting table, the TRD stirring pile is moved to the position of the pre-buried box to be connected with the cutting box, and the main machine returns to a preset construction position to automatically drive the cutting box into the ground for excavation.

And S2, injecting the cutting fluid through the host machine. After the main machine is connected with the cutting box, cutting fluid is sprayed out of the spray gun hole in the end part and is mixed and stirred with original soil, when the stop time is longer than 20 minutes in the stirring process, the end head needs to be lifted to the ground, and when the construction is continued, the end head is drilled to a position 1-2 meters below the original construction elevation to continue grouting.

S3, replacing the cutting fluid in the groove with cement through a main machine

And S4, inserting H-shaped steel to form the rigid retaining wall.

Optionally, in this embodiment, step S1 includes:

s101, excavating a guide groove by an excavator, and placing the guide groove into a pre-buried box. And according to the coordinate reference point which is set firstly, lofting positioning and guiding measurement are carried out according to a design drawing, and temporary marks are made. According to the inner edge control line of the foundation pit enclosure, firstly, a TRD construction guide groove with the width of 1-1.2 meters is excavated by an excavator, the depth is about 2 meters, and the residual soil in the excavated groove is timely treated to ensure the normal construction of the TRD construction method.

S102, placing the end part cutting box into a pre-buried box. And excavating an embedded hole with the depth of about 3 meters, the length of about 2 meters and the width of about 1 meter by using an excavator, and hanging the embedded box into the embedded hole.

S103, moving the main machine, and assembling the cutting box and the chain. And moving the main machine, moving the driving part of the main machine to the upper part of the pre-buried box, assembling the main machine with the cutting box and the chain, fastening the chain and locking the cutting box. And moving the assembled cutting boxes to the other end of the groove through the host, continuously placing one section of cutting box in the pre-buried box, drilling the cutting box, installing the next section of cutting box, splicing to complete all the cutting boxes, and drilling down to the preset construction depth.

And S104, after all the drills are drilled, putting the drill bit into an inclinometer, wherein the verticality is not more than 1 percent, and the wall deviation is not more than 50 mm. Through installing the inside multistage formula inclinometer of cutting box, carry out the perpendicular precision management of wall body.

Optionally, in this embodiment, step S2 includes:

s201, in the process of injecting the cutting fluid, the chain type cutter rotates, and further mixing and stirring are carried out. And injecting excavating liquid through a grouting pump, pushing the cutting box forwards, excavating the loosened original soil layer, and cutting into grooves.

Optionally, in this embodiment, step S3 includes:

s301, the cutting box is withdrawn to the cutting starting point to replace cement slurry.

And S302, injecting the cement slurry through a grouting pump. The cutting box is pushed forward and mixed and stirred with the cement slurry to form a stirring wall.

S303, keeping the wall forming process at 40-50 mm/min.

Optionally, in this embodiment, step S302 includes:

and S3021, controlling the grouting pressure of the grouting pump to be 0.5-1.5 Mpa, and controlling the conveying capacity of the grouting pump through a computer.

Optionally, in this embodiment, step S4 includes:

s401, pulling out the cutting box in the construction position or the construction depth changing area, and then reassembling the cutting box for subsequent operation.

And S402, replacing soil. The replacement soil generated by construction is firstly backfilled and the equipment is replaced to walk on the road, and the rest replacement soil is intensively stacked. And uniformly transporting the materials outside after reaching a certain volume.

Example two

The second embodiment is an alternative of the first embodiment, and the difference is that the components of the cutting fluid provided by the invention comprise: 50 parts of bentonite, 2 parts of foaming agent, 15 parts of silicon powder, 15 parts of perlite, 15 parts of calcium chloride and 87 parts of water.

Optionally, in this embodiment, the raw material composition of the foaming agent includes: 1.5 parts of sodium hydroxide, 4 parts of bone glue, 1.1 parts of triethanolamine and 2.5 parts of hoof and horn powder.

Optionally, in this embodiment, the fabric further includes 1.5 parts of a reinforcing fiber, where the reinforcing fiber is an aramid fiber.

The foaming effect of the first embodiment can be still obtained by adopting the component ingredients of the second embodiment, and a proper amount of foaming agent is added, so that the cutting fluid with good expansion performance, effective dispersion pressure, light weight and durability is formed, and the TRD method can achieve the effect of a continuous wall formed by a large amount of cement slurry by using a small amount of cutting fluid when first grooving and fixing are carried out.

EXAMPLE III

The third embodiment is an alternative of the first embodiment, and the difference is that the components of the cutting fluid provided by the invention comprise: 65 parts of bentonite, 2 parts of foaming agent, 25 parts of silicon powder, 18 parts of perlite, 23 parts of calcium chloride and 87 parts of water.

Optionally, in this embodiment, the fabric further includes 2 parts of a reinforcing fiber, where the reinforcing fiber is an aramid fiber.

The foaming effect of the first embodiment can be still obtained by adopting the ingredients of the third embodiment, and a proper amount of foaming agent is added, so that the cutting fluid with good expansion performance, effective dispersion pressure, light weight and durability is formed, and the TRD method can achieve the effect of a continuous wall formed by a large amount of cement slurry by using a small amount of cutting fluid when first grooving and fixing are carried out.

Example four

The fourth embodiment is an alternative of the first embodiment, and the difference is that the components of the cutting fluid provided by the invention comprise: 70 parts of bentonite, 4 parts of foaming agent, 30 parts of silicon powder, 20 parts of perlite, 15 parts of calcium chloride and 90 parts of water.

Optionally, in this embodiment, the raw material composition of the foaming agent includes: 3 parts of sodium hydroxide, 6 parts of bone glue, 1.3 parts of triethanolamine and 4 parts of hoof and horn powder.

Optionally, in this embodiment, 3 parts of a reinforcing fiber is further included, where the reinforcing fiber is an aramid fiber.

The foaming effect of the first embodiment can be still obtained by adopting the component ingredients of the fourth embodiment, and a proper amount of foaming agent is added, so that the cutting fluid with good expansion performance, effective dispersion pressure, light weight and durability is formed, and the TRD method can achieve the effect of a continuous wall formed by a large amount of cement slurry by using a small amount of cutting fluid when first grooving and fixing are carried out.

In the process of manufacturing the cutting fluid, the amount of the foaming agent is increased, the volume of the cutting fluid is increased, and the characteristics of stable performance, strong foaming capacity, high strength, pressure resistance, light weight and durability of the cutting fluid can be achieved.

In the present invention, unless otherwise explicitly specified or limited, the first feature "on" or "under" the second feature may be directly contacting the first feature and the second feature or indirectly contacting the first feature and the second feature through an intermediate.

Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The cutting fluid for TRD construction is characterized by comprising the following components: 50-70 parts of bentonite, 1-4 parts of foaming agent, 15-30 parts of silicon powder, 15-20 parts of perlite, 15-25 parts of calcium chloride and 85-90 parts of water.

2. The cutting fluid of claim 1, wherein the foaming agent comprises the following raw materials: 1-3 parts of sodium hydroxide, 2-6 parts of bone glue, 1-1.3 parts of triethanolamine and 2-4 parts of hoof and horn powder.

3. The cutting fluid of claim 1, further comprising: 1-3 parts of reinforcing fiber;

the reinforced fiber is carbon fiber or basalt fiber.

4. The preparation method of the cutting fluid is characterized by comprising the following steps of:

B. adding said sodium hydroxide to said water;

C. heating the solution to 50-70 deg.C;

D. adding the bone glue and stirring;

5. A construction method using the cutting fluid according to claim 4, comprising the steps of:

s2, injecting cutting fluid through a host;

and S4, inserting H-shaped steel to form the rigid retaining wall.

6. The method of applying a cutting fluid according to claim 5, wherein the step S1 includes:

s102, placing the end part cutting box into a pre-buried box;

s103, moving the main machine, and assembling the cutting box and the chain;

7. The method of applying a cutting fluid according to claim 5, wherein the step S2 includes:

8. The method of applying a cutting fluid according to claim 5, wherein the step S3 includes:

s302, injecting the cement slurry through a grouting pump;

s303, keeping the wall forming process at 40-50 mm/min.

9. The method of applying cutting fluid according to claim 8, wherein the step S302 comprises:

10. The method of applying a cutting fluid according to claim 5, wherein the step S4 includes:

s401, pulling out the cutting box;

s402, soil replacement treatment;