阅读说明：本技术 一种双液注浆施工方法 (Double-liquid grouting construction method ) 是由 冯祖国 李彦峰 赵维志 乔清源 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种双液注浆施工方法,其特征是,包括以下步骤：1)将第一注浆管和至少一根第二注浆管安装于待注浆处；2)向所述第一注浆管中注入浆液,待所述第一注浆管管口有浆液溢出时停止注浆,至浆液呈现凝胶状态后,再向所述第二注浆管中注浆；3)至所述第二注浆管中注浆流量达到15L/min～20L/min时,继续注浆5min～10min后,停止注浆。此方法不但能快速对土体强度低的区域进行加固,且加固后的土体力学强度均匀,开挖后土体能保持自稳,满足施工安全要求。(The invention discloses a double-liquid grouting construction method which is characterized by comprising the following steps of: 1) installing a first grouting pipe and at least one second grouting pipe at a position to be grouted; 2) injecting grout into the first grouting pipe, stopping grouting when the grout overflows from the pipe orifice of the first grouting pipe, and injecting grout into the second grouting pipe after the grout is in a gel state; 3) and when the grouting flow in the second grouting pipe reaches 15-20L/min, continuing grouting for 5-10 min, and stopping grouting. The method can quickly reinforce the area with low soil body strength, the mechanical strength of the reinforced soil body is uniform, the excavated soil body can keep self-stability, and the construction safety requirement is met.)

1. A double-liquid grouting construction method is characterized by comprising the following steps:

1) installing a first grouting pipe (1) and at least one second grouting pipe (2) at a position to be grouted;

2) injecting grout into the first grouting pipe (1), stopping grouting when the grout overflows from the pipe orifice of the first grouting pipe (1), and injecting grout into the second grouting pipe (2) after the grout is in a gel state;

3) and when the grouting flow rate in the second grouting pipe (2) reaches 15-20L/min, continuing grouting for 5-10 min, and stopping grouting.

2. The double-liquid grouting construction method according to claim 1, characterized in that: the slurry is mixed slurry of cement slurry and water glass.

3. The double-liquid grouting construction method according to claim 1, characterized in that: a grout stop plug (3) is arranged at a position 6-8 m below the ground along the direction of the second grouting pipe (2), and a grout outlet of the first grouting pipe (1) is arranged above the grout stop plug (3).

4. The double-liquid grouting construction method according to claim 3, characterized in that: the grout outlets of the second grouting pipes (2) are arranged below the grout stopping plugs (3), and the length difference of two adjacent second grouting pipes (2) is 3-5 m.

5. The double-liquid grouting construction method according to claim 1, characterized in that: the second grouting pipes (2) are sequentially arranged according to the length sequence.

6. The double-liquid grouting construction method according to claim 2, characterized in that: the weight ratio of water to cement in the cement paste is 0.4-1: 1-1: 1.2, the weight mixing amount of the water glass is 10-18% of the weight of the slurry.

7. The double-liquid grouting construction method according to claim 1, characterized in that: the first grouting pipe (1) and the second grouting pipe (2) are also provided with fixing devices (4), and reinforcing parts (5) are arranged between the fixing devices (4) and the first grouting pipe (1) and the second grouting pipe (2) respectively.

8. The double-liquid grouting construction method according to claim 1, characterized in that: the diameters of the first grouting pipe (1) and the second grouting pipe (2) are both 25 mm.

9. The two-fluid grouting construction method according to claim 1, wherein in step 2) and step 3):

when the length of the grouting pipe is less than 7m, the grouting pressure is 0.6 Mpa-1 Mpa;

when the length of the grouting pipe is 7-9 m, the grouting pressure is 1.0-1.5 Mpa;

When the length of the grouting pipe is 9-13 m, the grouting pressure is 1.5-2.0 Mpa;

when the length of the grouting pipe is 13-17 m, the grouting pressure is 2.0-2.5 Mpa;

when the length of the grouting pipe is more than 17m, the grouting pressure is 2.5 Mpa.

10. The two-fluid grouting construction method according to claim 2, wherein in step 2) and step 3):

when the flow rate of the slurry is more than 30L/min, the gelling time of the slurry is 1-2 min;

when the flow rate of the slurry is 20L-30L/min, the gelling time of the slurry is 3 min-4 min;

when the flow rate of the slurry is less than 20L/min, the gelling time of the slurry is 5-6 min.

Technical Field

The invention relates to a grouting method, in particular to a double-liquid grouting construction method.

Background

As cities expand faster and traffic gets more and more busy, some cities begin to build rail traffic to relieve the traffic pressure of congestion.

In the construction of track traffic, often can use the shield structure machine to excavate, improve work efficiency. And in some specific areas, for example, steel strands which are embedded during anchor cable construction exist in strata in the area, or areas with low mechanical strength of soil body cannot be directly excavated, the areas with low mechanical strength of the soil body are usually reinforced by adopting a grouting mode, the traditional grouting mode is to directly pour cement paste into the soil for reinforcement, the soil body reinforced by the method has different strengths, and some local strengths are large and some local strengths are small. The gel time of the single-slurry is generally 8 hours, and the gel time of the partial double-slurry is 30 minutes, so that the construction period is difficult to accelerate for a scheme with an urgent construction task.

Therefore, the technical personnel in the field are dedicated to developing a double-liquid grouting construction method, the method can quickly reinforce the area with low soil body strength, the mechanical strength of the reinforced soil body is uniform, the excavated soil body can keep self-stability, and the construction safety requirement is met.

Disclosure of Invention

In view of the above defects in the prior art, the technical problem to be solved by the present invention is to provide a two-fluid grouting construction method, which can not only quickly reinforce a region with low soil strength, but also has uniform mechanical strength of the reinforced soil, and the excavated soil can maintain self-stability, thereby meeting the construction safety requirements.

In order to achieve the purpose, the invention provides a double-liquid grouting construction method which is characterized by comprising the following steps of:

1) installing a first grouting pipe and at least one second grouting pipe at a position to be grouted;

2) injecting grout into the first grouting pipe, stopping grouting when the grout overflows from the pipe orifice of the first grouting pipe, and injecting grout into the second grouting pipe after the grout is in a gel state;

3) and when the grouting flow in the second grouting pipe reaches 15-20L/min, continuing grouting for 5-10 min, and stopping grouting. Grouting above the grouting holes, so that soil can be conveniently pressed in the subsequent grouting process, the soil body is further reinforced, and the mechanical strength of the soil body is uniform.

Further, the slurry is mixed slurry of cement slurry and water glass. The addition of water glass in the slurry is not only beneficial to improving the strength, but also convenient to control the setting time of the slurry.

Furthermore, a grout stop plug is arranged at a position 6-8 m below the ground along the direction of the second grouting pipe, and a grout outlet of the first grouting pipe (1) is arranged above the grout stop plug. And a grout stopping plug is arranged in the grouting hole, so that grout injected firstly can be blocked, and a closed chamber is formed.

Furthermore, the grout outlets of the second grouting pipes are arranged below the grout stop plugs, and the length difference of two adjacent second grouting pipes is 3-5 m. The plurality of second grouting pipes are not only beneficial to simultaneous grouting, but also beneficial to observing the grouting condition during single grouting.

Furthermore, the second grouting pipes are sequentially arranged according to the length sequence. The second grouting pipes are arranged in the length sequence, so that grouting and observation are facilitated, no grouting blind area is left, and the uniformity of grouting reinforcement is ensured.

Further, the weight ratio of water to cement in the cement paste is 0.4-1: 1-1: 1.2, the weight mixing amount of the water glass is 10-18% of the weight of the slurry. The content of the water glass and the cement is adjusted at any time according to the construction area and the construction progress so as to achieve the best grouting reinforcement effect.

Furthermore, a fixing device is further arranged outside the first grouting pipe and the second grouting pipe, and reinforcing parts are arranged between the fixing device and the first grouting pipe and between the fixing device and the second grouting pipe respectively. Fixing device and reinforcement are favorable to stabilizing each slip casting pipe, prevent that the slip casting in-process from appearing great rocking, influence the slip casting effect.

Further, the diameters of the first grouting pipe and the second grouting pipe are both 25 mm.

Further, in step 2) and step 3):

when the length of the grouting pipe is less than 7m, the grouting pressure is 0.6 Mpa-1 Mpa;

when the length of the grouting pipe is 7-9 m, the grouting pressure is 1.0-1.5 Mpa;

when the length of the grouting pipe is 9-13 m, the grouting pressure is 1.5-2.0 Mpa;

when the length of the grouting pipe is 13-17 m, the grouting pressure is 2.0-2.5 Mpa;

when the length of the grouting pipe is more than 17m, the grouting pressure is 2.5 Mpa. In the grouting process, the grouting pressure is adjusted according to the length and the diameter of the grouting pipe, so that the grouting effect is also achieved in the grouting process.

Further, in step 2) and step 3):

when the flow rate of the slurry is more than 30L/min, the gelling time of the slurry is 1-2 min;

when the flow rate of the slurry is 20L-30L/min, the gelling time of the slurry is 3 min-4 min;

When the flow rate of the slurry is less than 20L/min, the gelling time of the slurry is 5-6 min. Controlling the gel time is advantageous for controlling the slurry diffusion radius.

The invention has the beneficial effects that: the grouting liquid adopts a mixed solution of cement and water glass, and grouting parameters are dynamically adjusted according to hydrogeological conditions, so that the gel time is conveniently controlled; solidifying the soil body by adopting modes of infiltration, compaction, splitting, forming and grouting and the like without leaving a grouting blind area; the area with low soil body strength is quickly reinforced, the mechanical strength of the reinforced soil body is uniform, the excavated soil body can keep self-stability, and the construction safety requirement is met.

Drawings

FIG. 1 is a schematic flow chart of an embodiment of the present invention.

Fig. 2 is a schematic top view of a grouting device according to an embodiment of the present invention.

FIG. 3 is a schematic side view of a grouting device according to an embodiment of the invention.

FIG. 4 is a schematic view of a slip casting arrangement according to an embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that the terms "mounted," "connected," and "in communication with" are to be construed broadly unless otherwise specifically stated or limited. The raw materials, such as cement, water glass and the like, involved in the invention are all obtained from the market, and the machines involved in the invention, such as a mixer and a double-liquid grouting machine, are all common machines in the building engineering. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 4: