CN219015530U

CN219015530U - Outside pipe grouting pressure monitoring structure

Info

Publication number: CN219015530U
Application number: CN202223330964.1U
Authority: CN
Inventors: 王明远; 光军伟; 李明; 陈波; 武刘伟; 贺闻超; 胡绍举; 陈英阁; 贾猛; 赵艳辉; 李强; 樊开磊; 李科; 王哲良; 秦崇斌; 马琳; 申鹏飞; 吴保超; 王哲强
Original assignee: Zhengzhou City Municipal Engineering Corp
Current assignee: Zhengzhou City Municipal Engineering Corp
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-05-12
Anticipated expiration: 2032-12-13

Abstract

The utility model discloses an external grouting pressure monitoring structure of a pipe, which comprises a pipe section of a jacking pipe, wherein the pipe section is provided with an inner cavity, the outer wall of the pipe section is provided with a hoisting hole, and the bottom of the hoisting hole extends to the inner cavity of the pipe section to form an inner line hole; the inside of the lifting hole is provided with a fixed block in an interference fit manner, the direction pointing to the axis of the pipe joint is inward, and the outer surface of the fixed block is fixedly provided with a pressure sensor for monitoring the external slurry pressure of the pipe joint. The fixed block is internally provided with an outer line hole penetrating through the fixed block, a line of the pressure sensor penetrates through the outer line hole and the inner line hole to extend to an inner cavity of the pipe joint and extends to the ground through the pipe joint and the vertical shaft to be connected with a controller, and the controller is connected with the grouting pump. The utility model has the advantages that the slurry pressure outside the pipe joint of the jacking pipe can be directly measured, and further, the working state of the grouting pump is controlled, so that the slurry pressure outside the pipe joint can be more accurately kept at the preset pressure compared with the previous mode of controlling the pressure at the grouting pipe, and the protection force formed by the pipe joint after the slurry is solidified is more close to the design value.

Description

Outside pipe grouting pressure monitoring structure

Technical Field

The utility model relates to the technical field of pipe jacking construction.

Background

The basic structure of the pipe jacking construction is that the front end of a pipe joint of the pipe jacking is connected with and jacks a machine head, and the machine head is provided with a rotatable cutterhead forwards. When the pipe jacking construction is performed, a vertical shaft is needed, a cutter disc and a machine head are placed in a hole in the jacking direction (approximately horizontal direction) in the vertical shaft, the machine head is jacked into the soil body by jacking equipment in the vertical shaft, then a pipe joint of the pipe jacking is hoisted into the vertical shaft, the pipe joint is jacked forward by the jacking equipment in the vertical shaft, and after the previous pipe joint is jacked forward in place, the jacking equipment is retracted and hoisted into the next pipe joint of the pipe jacking. And continuously jacking the pipe joint of the jacking pipe forwards, and carrying out jacking pipe construction.

As shown in fig. 1, in the pipe jacking construction, the nose is larger than the diameter of the pipe section 1 (pipe section 1 of the pipe jacking), for example, by 4 cm, a hole 2 with the same diameter is formed when the nose is jacked in, and an annular space 3 (2 cm) is formed between the inner wall of the hole 2 and the outer wall of the pipe section 1.

If the annular space 3 is not filled, peripheral soil body can be extruded onto the pipe body under the action of soil stress (active soil pressure), so that the soil body friction force in the jacking process of the pipeline (a plurality of pipe joints 1 of the jacking pipe) is greatly increased, the energy consumption of jacking equipment in the construction of the jacking pipe is greatly increased, and the jacking distance of the specific jacking equipment is shortened.

The maximum jacking pressure of the specific jacking equipment is fixed, the friction force between the pipe section 1 of the jacking pipe and the peripheral soil body or slurry is continuously increased along with the extension of the jacking distance, namely the extension of the pipe section 1, and when the friction force reaches the maximum jacking pressure of the specific jacking equipment, the (pipe section 1 of the) jacking pipe cannot be continuously jacked forward.

Therefore, grouting lubrication is needed for the annular space 3, so that the power consumption of the jacking equipment in unit jacking distance is reduced, and the maximum jacking distance of the jacking equipment is prolonged.

Grouting work requires monitoring of grouting pressure.

In the prior art, the grouting pressure is monitored at the grouting pipe, and the grouting pressure in the grouting pipe is monitored at the grouting pipe, so that the grouting pressure monitoring has the advantages of being convenient for installing a pressure sensor, easy to realize and mature in technology, but the defect is that the monitored grouting pressure is not representative of the pressure of the grouting after the grouting exits from the grouting pipe and enters into the annular space 3, and the pressure difference between the grouting pressure and the grouting pressure is large.

For grouting retaining walls, the actual grouting pressure in the annular space 3 around the pipe section 1 of the jacking pipe has a final meaning, the pressure is closely related to the protection force formed by the pipe (the pipe section 1 of the jacking pipe) after the slurry is solidified, and the pressure in the grouting pipe monitored in the prior art is only indirectly related to the actual grouting pressure outside the pipe section 1, so that the actual grouting pressure in the annular space 3 around the pipe section 1 of the jacking pipe cannot be controlled more accurately.

Therefore, it is necessary to develop a technique for directly monitoring the actual grouting pressure around the pipe (the pipe section 1 of the jacking pipe).

As shown in fig. 2, the pipe section 1 of the top pipe needs to be lifted, so that a lifting hole 4 is originally formed in the pipe section 1, specifically, a pair of lifting holes 4 are correspondingly formed in the outer wall of the pipe section 1 at 180 degrees, a stress rod 5 is inserted into the lifting hole 4 during lifting, and then the lifting tool is used for connecting the stress rod 5 (the steel wire rope 6 is directly connected with the stress rod 5), so that the pipe section 1 can be lifted.

Disclosure of Invention

The utility model aims to provide a pipe external grouting pressure monitoring structure which is used for directly measuring grouting pressure around the outer wall of a pipe joint 1 of a jacking pipe and provides a basis for realizing more accurate control of grouting pressure.

In order to achieve the purpose, the pipe outer grouting pressure monitoring structure comprises a pipe section of a jacking pipe, wherein the pipe section is provided with an inner cavity, the outer wall of the pipe section is provided with a hoisting hole, and the bottom of the hoisting hole extends to the inner cavity of the pipe section to form an inner line hole; the inside of the lifting hole is provided with a fixed block in an interference fit manner, the direction pointing to the axis of the pipe joint is inward, and the outer surface of the fixed block is fixedly provided with a pressure sensor for monitoring the external slurry pressure of the pipe joint.

The fixed block is internally provided with an outer line hole penetrating through the fixed block along the inner and outer directions, a line of the pressure sensor penetrates through the outer line hole and the inner line hole to extend to an inner cavity of the pipe joint and extends to the ground through the pipe joint and the vertical shaft to be connected with a controller, and the controller is connected with the grouting pump.

The outer end of the pressure sensor is positioned in the lifting hole.

The controller is connected with a display screen.

The utility model has the following advantages:

the utility model has the advantages that the slurry pressure outside the pipe joint of the jacking pipe can be directly measured, and further, the working state of the grouting pump is controlled, so that the slurry pressure outside the pipe joint can be more accurately kept at the preset pressure compared with the previous mode of controlling the pressure at the grouting pipe, and the protection force formed by the pipe joint after the slurry is solidified is more close to the design value.

According to the utility model, the pressure sensor is installed by utilizing the original hoisting hole of the pipe joint and the fixed block (grouting expansion block) in interference fit, after the pipe joint is hoisted in place and the hoisting hole is not used, the pressure sensor is installed in the hoisting hole, the useless structure after the pipe joint is hoisted is fully utilized, the additional punching installation is not needed, and the structure utilization is ingenious and full.

Drawings

Fig. 1 is a schematic view of the structure of the annular space 3 between the pipe section 1 and the hole 2;

fig. 2 is a schematic structural view of the pipe joint 1 when being hoisted;

FIG. 3 is a schematic diagram of the structure of the present utility model;

fig. 4 is a schematic diagram of an enlarged pipe wall structure of a pipe joint at a lifting hole.

The drawings are schematic in structure and are not drawn to scale.

Detailed Description

As shown in fig. 1 to 4, the pipe external grouting pressure monitoring structure comprises a pipe section 1 of a jacking pipe, wherein the pipe section 1 is provided with an inner cavity 16, the outer wall of the pipe section 1 is provided with a lifting hole 4, and the bottom of the lifting hole 4 extends to the inner cavity 16 of the pipe section 1 to form an inner line hole 13; the hoisting hole 4 is internally provided with a fixed block 14 in interference fit, and the fixed block 14 can be a grouting expansion block. The outer surface of the fixed block 14 is fixedly provided with a pressure sensor 7 for monitoring the slurry pressure outside the pipe joint 1 by taking the direction pointing to the axis of the pipe joint 1 as the inward direction.

An outer line hole 8 penetrating through the fixed block 14 along the inner and outer directions is arranged in the fixed block 14, and the outer line hole 8 is correspondingly communicated with the inner line hole 13; the line 17 of the pressure sensor 7 extends through the outer and

inner bores

8, 13 to the inner cavity 16 of the pipe section 1 and through the pipe section 1 and the shaft 9 to the ground connection control 10, which control 10 is connected to the grouting pump 11. The grouting pump 11 injects slurry into the annular space through a grouting pipe 12 connected thereto. The inlet of the grouting pump 11 is connected with a slurry stirring device through a pipeline, and the slurry stirring device uniformly stirs slurry (water and materials) and supplies the slurry to the grouting pump. The slurry stirring device is conventional and is not shown.

The outer end of the pressure sensor 7 is positioned in the lifting hole 4. If the outer end of the pressure sensor 7 protrudes out of the lifting hole 4, the pressure sensor is easily damaged in the jacking process. Thus, the pressure sensor 7 is integrally fitted into the hoist hole 4. The controller 10 may be an integrated circuit or a single chip microcomputer.

The controller 10 is connected with a display screen 15. The display screen 15 facilitates the staff to monitor directly the slurry pressure in the annular space outside the pipe section 1.

The utility model has the advantages that the slurry pressure outside the pipe joint 1 of the jacking pipe can be directly measured, and further, the working state of the grouting pump 11 is controlled, so that the slurry pressure outside the pipe joint 1 can be more accurately kept at the preset pressure compared with the previous mode of controlling the pressure at the grouting pipe 12, and the protection force formed by the pipe joint 1 after the slurry is solidified is more close to the design value.

According to the utility model, the original hoisting hole 4 of the pipe joint 1 is utilized, the pressure sensor 7 is installed by matching with the fixed block 14 (grouting expansion block) in interference fit, after the pipe joint 1 is hoisted in place and the hoisting hole 4 is not useful, the pressure sensor 7 is installed in the hoisting hole 4, the useless structure after the pipe joint 1 is hoisted is fully utilized, the additional punching installation is not needed, and the structure utilization is ingenious and full.

When the grouting device works, the grouting pump 11 injects slurry into the annular space through the grouting pipe 12 connected with the grouting pump, the pressure sensor 7 monitors the slurry pressure at the outer wall of the pipe joint 1 and feeds the slurry pressure back to the controller 10 to be displayed on the display screen 15, so that the technology of controlling the pressure in the grouting pipe 12 in the prior art is improved into the technology of controlling the slurry pressure in the annular space outside the pipe joint 1; more direct pressure control (than controlling the pressure in the grouting pipe) results in a better grouting effect.

Claims

1. The utility model provides a slip casting pressure monitoring structure outside pipe, includes the tube coupling of push pipe, and the tube coupling has the inner chamber, and the tube coupling outer wall has lifting hole, its characterized in that: an inner wire hole extends from the bottom of the hoisting hole to the inner cavity of the pipe joint; the inside of the lifting hole is provided with a fixed block in an interference fit manner, the direction pointing to the axis of the pipe joint is inward, and the outer surface of the fixed block is fixedly provided with a pressure sensor for monitoring the external slurry pressure of the pipe joint.

2. The out-of-pipe grouting pressure monitoring structure according to claim 1, wherein: the fixed block is internally provided with an outer line hole penetrating through the fixed block along the inner and outer directions, a line of the pressure sensor penetrates through the outer line hole and the inner line hole to extend to an inner cavity of the pipe joint and extends to the ground through the pipe joint and the vertical shaft to be connected with a controller, and the controller is connected with the grouting pump.

3. The out-of-pipe grouting pressure monitoring structure according to claim 1, wherein: the outer end of the pressure sensor is positioned in the lifting hole.

4. The out-of-pipe grouting pressure monitoring structure according to claim 2, wherein: the controller is connected with a display screen.