CN110258631B

CN110258631B - Pipe gallery joint dynamic waterproof method

Info

Publication number: CN110258631B
Application number: CN201910536214.3A
Authority: CN
Inventors: 宋欣欣; 刁钰; 史志利; 秘诚; 李国金; 张栋俊; 李海新; 张琪
Original assignee: Tianjin Municipal Engineering Design and Research Institute
Current assignee: Tianjin Municipal Engineering Design and Research Institute
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2021-03-02
Anticipated expiration: 2039-06-19
Also published as: CN110258631A

Abstract

The invention discloses a dynamic waterproof method for a pipe gallery joint, which comprises the following steps: selecting sand for modification, and cleaning the sand; standing the sand in steam of trimethylsilanol for a period of time to ensure that the trimethylsilanol fully reacts with silicon dioxide in the sand, and removing hydroxyl groups from the trimethylsilanol to tightly combine with the silicon dioxide to obtain hydrophobic sand; and uniformly paving the obtained hydrophobic sand at the joint of the pipe gallery. The invention solves the problem that the conventional seepage-proofing and leakage-proofing joint of the pipe gallery can not solve the problem that the waterproof material changes along with cracks, is suitable for most of pipe gallery waterproof and seepage-proofing scenes, is suitable for most of pipe gallery joint forms, can change along with the change of the shape of the pipe gallery joint, and keeps waterproof and seepage-proofing performances.

Description

Pipe gallery joint dynamic waterproof method

Technical Field

The invention belongs to the technical field of foundation engineering construction, and particularly relates to a dynamic waterproof method for a pipe gallery joint.

Background

With the gradual deepening development of China to underground space, the pipe gallery is more and more applied to urban construction, however, due to the complex underground water environment, in the construction of the pipe gallery, the water prevention and seepage prevention are of great importance. The utility tunnel phenomenon of leaking water will cause serious influence to the structure of the tunnel itself and the infrastructure in the tunnel once it takes place.

At present, a pipe gallery is formed by splicing a plurality of pipe pieces, and a water stop is arranged at the pipe pieces to achieve the purposes of water prevention and seepage prevention. Because temperature variation, structure self atress inequality reason often can take place to warp at section of jurisdiction seam crossing, the requirement that seam crossing deformation need be satisfied in the setting of waterstop. However, as the material of the water stop belt ages, the area covered by the water stop belt is reduced, the water stopping capability is gradually reduced, and the water seepage and leakage can occur.

In addition, the sizes and the shapes of the joints are not completely unified due to uncertain factors in the construction process in the actual construction process, irregular cracks can occur, and the places can become hidden dangers of water seepage and water leakage of the pipe gallery in the future.

Therefore, developing a water-stopping system which can change along with the actual deformation condition of the pipe gallery is an important step in the construction of the pipe gallery.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a dynamic waterproof method for a pipe gallery joint, is a pipe gallery waterproof and anti-seepage scheme based on hydrophobic sand obtained by trimethylsilanol modification, and solves the problem that a conventional pipe gallery anti-seepage and anti-leakage joint cannot solve the problem that a waterproof material changes along with cracks.

The purpose of the invention is realized by the following technical scheme.

The invention discloses a dynamic waterproof method for a pipe gallery joint, which comprises the following steps:

step (1): selecting sand for modification, and cleaning the sand;

step (2): standing the sand in steam of trimethylsilanol for a period of time to ensure that the trimethylsilanol fully reacts with silicon dioxide in the sand, and removing hydroxyl groups from the trimethylsilanol to tightly combine with the silicon dioxide to obtain hydrophobic sand;

and (3): and (3) uniformly paving the hydrophobic sand obtained in the step (2) at the joint of the pipe gallery.

The sand used in the step (1) is required to be non-cohesive, the main component of the sand is silicon dioxide, and the sand has good gradation.

The reaction time in the step (2) needs to be determined according to the amount of the sand used for modification, and whether the reaction is sufficient or not needs to be verified after the reaction is finished.

And (4) paving the hydrophobic sand in the step (3) requires that the paving thickness is uniform and the width of the joint of the pipe gallery is completely covered.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

(1) the method has the advantages of simple construction operation, simple preparation method of the hydrophobic sand, simple construction method and popularization.

(2) The invention can realize the waterproof and seepage-proof construction of the complicated pipe gallery joint shape. Because sand does not have cohesion by itself, so sand can evenly distributed in piping lane seam department under the action of gravity.

(3) The invention can change along with the change of the shape of the pipe gallery joint, and can keep the waterproof and anti-seepage performance.

(4) The invention has flexible use scene, and can lay the hydrophobic sand in any place with water seepage and leakage hidden trouble in the pipe gallery construction.

(5) The invention can realize green environmental protection: the trimethylsilanol and the reactant of the trimethylsilanol and the silicon dioxide have no adverse effect on soil and the surrounding environment.

Drawings

Fig. 1 is a flow chart of the dynamic waterproofing method for the pipe gallery joint of the present invention.

FIG. 2 is a schematic representation of the use of piping lane joint hydrophobic sand;

reference numerals: 1-pipe gallery segments; 2-backfilling and covering soil; 3-hydrophobic sand; 4-piping lane joint

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following embodiments are exemplified and described in detail with reference to the accompanying drawings.

The invention discloses a dynamic waterproof method for a pipe gallery joint, which is shown in figure 1 and specifically comprises the following implementation processes:

firstly, selecting and cleaning sand

Selecting modified sand, washing off impurities and dust on the surface of the sand by water, and cleaning the sand to create good conditions for the reaction with the trimethylsilanol. Wherein the selected sand is required to have no cohesive force, the main component of the sand is silicon dioxide, and the sand used in construction has good gradation.

Secondly, preparing hydrophobic sand

The sand is placed in steam of trimethylsilanol for a period of time, so that trimethylsilanol fully reacts with silicon dioxide in the sand, hydroxyl of trimethylsilanol is removed, the trimethylsilanol is tightly combined with the silicon dioxide, and a material with the surface of the silicon dioxide coated with methyl, namely hydrophobic sand (hydrophobic sand, water is difficult to infiltrate), the sand obtained by the method has no cohesive force in a dry state due to the strong hydrophobicity of the methyl, shows cohesive force and strong hydrophobicity in a wet state, and can prevent water from passing through.

Specifically, the hydrophobic sand preparation device is a closed device, the middle of the device is separated by a metal net which can not allow sand grains to pass through, the device is divided into an upper layer and a lower layer, trimethylsilanol is injected into the lower layer, sand is placed in the upper layer, the trimethylsilanol at the lower layer is heated to 100 ℃ to form trimethylsilanol steam, and the sand and the trimethylsilanol steam are in full contact reaction to generate the hydrophobic sand. This process is repeated until the desired amount of hydrophobic sand for the project is obtained.

The specific method comprises the steps of randomly selecting a part of sand, placing the sand into water, observing whether a layer of air film is coated on the surface of the sand to show silver color, if the silver air film exists, indicating that the reaction is sufficient, and otherwise, indicating that the reaction is not sufficient.

Laying of hydrophobic sand

Referring to fig. 2, the requirement for laying hydrophobic sand at the joint of the pipe gallery includes:

lay the hydrophobic sand in piping lane seam crossing, it is even to require to lay thickness, covers the width of piping lane seam completely, because the expansion of piping lane seam can lead to more hydrophobic sands to fall into the piping lane seam, consequently need additionally lay a plurality of hydrophobic sands in order to keep the lasting of waterproof and anti-seepage performance of piping lane seam crossing.

The thickness and the width of the hydrophobic sand are determined according to the actual seam width and the stress condition and the anti-seepage grade.

And applying pressure to the surface of the hydrophobic sand to ensure that the hydrophobic sand is completely distributed in the surface space of the joint of the pipe gallery.

And after the hydrophobic sand is paved, according to the characteristics of example engineering, continuing to cover soil and other subsequent pipe gallery construction procedures.

Referring to fig. 2, the method for applying the hydrophobic sand to the joint of the lower side of the pipe rack is to place the hydrophobic sand on the soil body below, so that the hydrophobic sand is located between the soil body and the joint of the pipe rack.

While the present invention has been described in terms of its functions and operations with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise functions and operations described above, and that the above-described embodiments are illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.

Claims

1. A method for dynamically waterproofing a pipe gallery seam is characterized by comprising the following steps:

step (1): selecting modified sand which has no cohesive force and has silicon dioxide as a main component and good gradation, and cleaning the sand;

2. The dynamic waterproof method for the pipe gallery joint according to claim 1, wherein the reaction time in the step (2) is determined according to the amount of the sand used for modification, and whether the reaction is sufficient or not needs to be verified after the reaction is completed.

3. The method for dynamically waterproofing pipe rack joints according to claim 1, wherein the step (3) of laying the hydrophobic sand requires that the laying thickness be uniform and completely cover the width of the pipe rack joints.