CN209841650U - Pipe jacking of pipe jacking experimental box - Google Patents

Abstract

The utility model discloses a pipe jacking of a pipe jacking experiment box with a grouting mechanism, which is characterized in that the jacking pipe includes an inner pipe jacking and an outer pipe jacking with the same central axis, and the difference between the inner jacking pipe and the outer pipe jacking is The space is connected and fixed by the skeleton, and the outer jacking pipe is provided with a grouting hole and a grouting hole; the jacking pipe of the utility model has the characteristics of simple structure, visualization, and convenient pipe jacking operation and grouting. Slurry can be used to conduct model tests to simulate formation deformation caused by pipe jacking construction under multiple conditions on site.

Description

Jacking pipe of the pipe jacking experiment box

technical field

The utility model relates to the technical field of pipe jacking construction tests in underground engineering, in particular to a pipe jacking experiment box, in particular to a pipe jacking experiment box equipped with a grouting mechanism.

Background technique

In the process of urbanization, the contradiction between urban expansion and insufficient supply of scarce land resources is becoming more and more obvious. The planning and development of underground space development can improve the level of urban facilities to increase the competitiveness of the city. With the increasing scale of underground space development, the development of underground space is affected by geological conditions, hydrological conditions, rock and soil types, ground space types, existing underground facilities, construction technology, economic capacity, cultural sites, and social benefits after development. Influenced and restricted by many factors such as environmental benefits and environmental benefits, and the development and utilization are irreversible, it is difficult to transform or rebuild after completion. The problems encountered in the construction of underground space are complex. Underground engineering construction has the characteristics of large investment, long construction period, many construction projects, complex construction technology, many unforeseen risk factors, and great impact on the social environment. It is a high-risk construction project. . In recent years, during the construction of urban underground projects, safety accidents such as foundation pit collapse, ground subsidence, tunnel water gushing, tunnel surface collapse, and adjacent buildings tilting and collapsing have occurred frequently, which not only delayed the construction period, but also caused great economic losses. and casualties.

Pipe jacking construction is a non-excavation construction method. It is a pipeline burying construction technology without excavation or less excavation. It uses hydraulic pressure as the power to jack the pipe jacking machine and the pipe joints to be laid underground one by one. During the construction process, the soil around the pipeline will inevitably be disturbed, causing deformation of the soil around the pipeline, causing displacement of the ground and underground soil, that is, stratum deformation. When the formation deformation exceeds a certain range, it will seriously endanger the safety of the foundation of adjacent buildings (structures), adjacent buildings (structures), underground pipe network and ground buildings, and cause a series of geotechnical problems. At present, in the design and construction of the pipe jacking method, it is necessary to use the pipe jacking test box to simulate the model test of the ground deformation caused by the pipe jacking construction under various conditions on site.

In order to reduce the frictional resistance of pipe jacking during jacking and control the surface settlement caused by pipe jacking construction, it is necessary to inject grout into the soil around the pipe under a certain pressure, referred to as grouting. Synchronous grouting during pipe jacking and filling grouting after pipe jacking are one of the key technical links in pipe jacking construction. The properties of the grout used in synchronous grouting and filling grouting are different, and their functions are also different. The role of the grouting fluid in synchronous grouting is mainly reflected in two aspects: 1. Drag reduction; 2. Filling and supporting. After the pipe jacking is completed, filling and grouting will be carried out, and the filling and grouting will play the role of filling and controlling formation settlement.

The invention patent application with the application number 201210137982.X discloses an indoor simulation experiment system for pipe jacking grouting drag reduction, which includes a test chamber, a horizontal loading system, a vertical loading system, a grouting system, and a system connected to the grouting system. grouting conduits, etc., the pipeline to be tested is composed of the interconnected front section and the rear section of the pipeline, and the diameter of the front section of the pipeline is thicker than the diameter of the rear section of the pipeline, and at least one grouting pipe is provided on the pipeline wall of the pipeline to be tested. A grouting hole, the grouting end of the grouting conduit extends into the pipeline to be tested and is connected with the grouting hole. The test system can simulate the jacking process of the pipeline in the soil layer, and test the frictional resistance and friction coefficient during the jacking process of the pipeline under different grout ratios and different grouting pressures. However, since the grouting pipe needs to be pre-embedded in the soil of the test box, it is impossible to bury the grouting pipe in advance in engineering practice, and the pre-embedded grouting pipe has a restraining effect on the surrounding soil during the pipe jacking simulation process. It cannot simulate the actual pipe jacking construction well. Therefore, it is necessary to invent a pipe jacking that can truly simulate pipe jacking construction and synchronous grouting in pipe jacking construction experiments.

Contents of the invention

The purpose of the utility model is to provide a pipe jacking experiment box with a grouting mechanism.

The utility model realizes the purpose of the invention by adopting the following technical scheme, a pipe jacking of a pipe jacking experiment box, the pipe jacking includes an inner pipe jacking and an outer pipe jacking with the same central axis, and the difference between the inner jacking pipe and the outer pipe jacking is The space is connected and fixed by the skeleton, and the outer jacking pipe is provided with grouting holes and grouting holes.

For the convenience of grouting, the framework of the utility model divides the space between the inner jacking pipe and the outer jacking pipe into at least two axial independent spaces, and the outer jacking pipe is respectively provided with grouting holes, Pulp hole.

In order to visually demonstrate the influence of pipe jacking construction, the inner pipe jacking, outer pipe jacking and skeleton described in the utility model are made of transparent materials.

Due to the adoption of the above-mentioned technical scheme, the utility model better realizes the purpose of the invention. The pipe jacking has the characteristics of simple structure, visualization, convenient pipe jacking operation and grouting. At the same time of pipe jacking, the grouting is carried out synchronously, and many simulations can be carried out on site. Model test of formation deformation induced by pipe jacking construction under different conditions.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the E-E sectional view of Fig. 1;

Fig. 3 is the A-A sectional view of Fig. 1;

Fig. 4 is the B-B sectional view of Fig. 1;

Fig. 5 is a C-C sectional view of Fig. 1;

Fig. 6 is a D-D sectional view of Fig. 1 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Example 1:

It can be seen from Fig. 1 and Fig. 2 that a pipe jacking of a pipe jacking experiment box includes an inner jacking pipe 31 and an outer jacking pipe 32 with the same central axis, and the inner jacking pipe 31 and the outer jacking pipe 32 pass through The skeleton 33 is connected and fixed, and the outer jacking pipe 32 is provided with a grouting hole and a grouting hole.

In order to visually demonstrate the impact of pipe jacking construction, the inner pipe jacking 31, the outer pipe jacking 32 and the skeleton 33 described in the utility model are made of transparent materials.

In this embodiment, a square box is surrounded by a transparent board and a skeleton, and a drainage hole is provided at the bottom of the box. According to the requirements of the experiment, the selected transparent soil is filled in layers in the box and compacted. During the filling process, the measuring device for measuring and collecting the soil pressure value and the stratum displacement value is installed. The measuring devices include earth pressure cells, inclinometer tubes, settlement nails and the like.

In this embodiment, an independent space is formed between the inner jacking pipe 31 and the outer jacking pipe 32, and one grouting hole is provided on the outer jacking pipe 32, and multiple grouting holes are set according to the length of the jacking pipe. There is a force measuring mechanism on the jack.

During the experiment, first connect the grouting equipment to the grouting hole on the outer jacking pipe 32, and temporarily seal the exposed grouting hole of the outer jacking pipe 32 with a rubber sleeve. , grouting through the grouting equipment, the grout flows from the grout hole to the outside of the pipe wall of the outer jacking pipe 32, and fills in the gap between the outer side of the outer jacking pipe 32 and the soil outside the pipe, so as to reduce the resistance during subsequent pipe jacking. According to the pipe jacking stroke, determine the opening and closing of each slurry outlet. Repeat the above steps until all the jacking pipes 3 are pushed into the transparent soil. Collect the soil pressure value and stratum displacement value, and analyze the mechanical response of the stratum; collect the jacking force of the jacking process through the force measuring mechanism on the jack, and evaluate the drag reduction effect of grouting; conduct the drag reduction construction experiment of pipe jacking .

After the pipe jacking is completed, filling and grouting can also be carried out, and the lifting test of the pipe jacking grouting can be carried out.

Example 2:

From Fig. 1, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, it can be known that for the convenience of grouting, the framework 33 of the utility model divides the space between the inner jacking pipe 31 and the outer jacking pipe 32 into at least two axial Each independent space is provided with a grouting hole and a grouting hole corresponding to each independent space on the outer jacking pipe 32 .

In this embodiment, the space between the inner jacking pipe 31 and the outer jacking pipe 32 is divided into four axial independent spaces, and the outer jacking pipe 32 is respectively provided with a grouting hole 3E and a grouting hole 3A corresponding to each independent space. Grouting hole 3F, grouting hole 3B, grouting hole 3G, grouting hole 3C, grouting hole 3H, grouting hole 3D.

During the experiment, first connect the grouting pipe to the grouting hole 3E, and the grouting hole 3E corresponds to the grouting hole 3A at the top of the outer jacking pipe 32, and then pressurize the jack to push the jacking pipe 3 forward; Push into the stroke, and then the grouting pipes are respectively connected with the grouting hole 3F, the grouting hole 3G, and the grouting hole 3H, respectively corresponding to the grouting hole 3B, the grouting hole 3C, and the grouting hole 3D. Collect the soil pressure value and stratum displacement value, and analyze the mechanical response of the stratum; collect the jacking force of the jacking process through the force measuring mechanism on the jack, and evaluate the drag reduction effect of grouting; conduct the drag reduction construction experiment of pipe jacking .

After the pipe jacking is completed, filling and grouting can also be carried out, and the grouting pipe is connected with the grouting hole 3E, the grouting hole 3F, the grouting hole 3G and the grouting hole 3H, and the pipe jacking grouting uplift test is carried out.

The rest are the same as embodiment 1.

Claims (3)

1. A pipe jacking of a pipe jacking experiment box, characterized in that said pipe jacking includes an inner pipe jacking and an outer pipe jacking of the same central axis, the inner jacking pipe and the outer pipe jacking are connected and fixed by a skeleton, and the outer pipe jacking There are grouting holes and grouting holes on the top. 2. The pipe jacking of the pipe jacking experiment box according to claim 1, characterized in that the space between the inner pipe jacking and the outer pipe jacking is divided into at least 2 axially independent spaces by the framework, and the space on the outer pipe jacking is Corresponding to each independent space, a grouting hole and a grouting hole are respectively provided. 3. The pipe jacking of the pipe jacking experiment box according to claim 1 or 2, characterized in that the inner pipe jacking, outer pipe jacking and skeleton are made of transparent materials.