Construction method for treating jacking slab staggering in rectangular pipe jacking construction of soft soil stratum

Abstract

The invention discloses a construction method for treating jacking slab staggering in rectangular pipe jacking construction of a soft soil stratum, which comprises a to-be-adjusted pipe joint, the to-be-adjusted pipe joint is positioned at the joint of a reinforced area and the soft soil stratum, and a slab staggering is arranged between the to-be-adjusted pipe joint and an adjacent pipe joint in front of the to-be-adjusted pipe joint; the slab staggering is treated in the jacking process by adopting the following method: 1) fixedly connecting the pipe joint to be adjusted with two side walls of an adjacent pipe joint in front of the pipe joint to be adjusted by adopting a diagonal member I, and fixedly connecting the pipe joint to be adjusted with two side walls of an adjacent pipe joint behind the pipe joint to be adjusted with a diagonal member II; and the jacking force output direction of the oil cylinder is consistent with the designed jacking axis. According to the method, the to-be-adjusted pipe joint located at the joint of the reinforcing area and the non-reinforcing area is based on the front adjacent pipe joint, the pipe joint staggering phenomenon is improved by adjusting the applying direction of the jacking force and improving the integrity of the pipe joint, and therefore the sealing performance and attractiveness of a pipe joint channel are improved, construction is easy and convenient, and the effect is good.

Description

Technical Field

[0001] The invention relates to a pipe jacking construction method, in particular to a construction method for handling jacking misalignment in pipe jacking construction in soft soil layers. Background Art

[0002] Rectangular pipe jacking technology is an innovative solution in the field of underground pipeline construction. It uses rectangular cross-section pipes and lays them underground safely and efficiently through a jacking process. This technology not only optimizes the use of underground space, but also significantly reduces the interference of construction on ground traffic and the environment. With its unique advantages, such as high structural strength, strong adaptability, and fast construction speed, rectangular pipe jacking has been widely used in many fields such as municipal water supply and drainage, gas, electricity, and communications, providing strong support for the improvement and upgrading of urban infrastructure.

[0003] At present, when the pipe jacking construction encounters soft soil layers, in order to prevent the pipe jacking machine from falling when entering the soft soil layer through the reinforcement area, the pipe jacking machine is generally "raised" to enter the hole, and then gradually adjusted to the designed slope after the pipe jacking machine passes through the reinforcement area. When the above construction method is adopted, the two adjacent pipe sections located at the junction of the reinforcement area and the non-reinforced area are prone to misalignment. The specific situation is as follows: In the early stage of construction, due to the tie-up between the pipe jacking machine and the pipe section and between the pipe sections, basically no misalignment will occur. However, in order to facilitate the posture adjustment of the pipe section, generally only the first few sections are tied. When the untied pipe section passes through the junction of the reinforcement area and the non-reinforced area, due to the gravity of the front pipe jacking machine and the pipe section and the influence of the downward adjustment of the front posture, the pipe section at this position and the adjacent pipe section in front are prone to increase the upper gap. At the same time, due to the lifting of the pipe jacking machine, the downward component of the output force of the oil cylinder is reduced. The change in the downward component further increases the above-mentioned upper gap, thereby causing a large misalignment between the two adjacent pipe sections at the junction of the reinforcement area and the non-reinforced area. Misalignment can lead to a loose or even failure in waterproofing of the socket joints, causing water leakage between pipe joints. In severe cases, dangerous situations may occur. Therefore, it is necessary to propose a construction method for dealing with misalignment in pipe jacking construction in soft soil layers. Summary of the invention

[0004] In order to solve the technical problems existing in the known technology, the present invention provides a construction method for handling jacking misalignment in rectangular jacking construction in soft soil layers, which can eliminate the misalignment between two adjacent pipe sections at the junction of the reinforced area and the non-reinforced area.

[0005] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a construction method for handling jacking misalignment in rectangular jacking construction in soft soil layers, including a pipe section to be adjusted, the pipe section to be adjusted is located at the junction of the reinforcement area and the soft soil layer, and there is a misalignment between the adjacent pipe section in front of it. The misalignment is handled during the jacking process by the following method: 1) the pipe section to be adjusted and the adjacent pipe section in front of it are fixedly connected together by inclined tie rods I, and the pipe section to be adjusted and the adjacent pipe section behind it are fixedly connected together by inclined tie rods II; 2) by adding a wedge between the cylinder and the rear backrest, the direction of the jacking force output by the cylinder is consistent with the designed jacking axis.

[0006] On the basis of the above scheme, the present invention also makes the following improvements:

[0007] The inclined tie rod member I and the inclined tie rod member II are made of channel steel.

[0008] The oblique tie rod member I and the oblique tie rod member II are higher in the front and lower in the back.

[0009] The ends of the inclined tie rod member I and the inclined tie rod member II are connected and fixed to the corresponding pipe segment embedded steel plates by three-sided welding.

[0010] The advantages and positive effects of the present invention are: the pipe section to be adjusted at the junction of the reinforced area and the non-reinforced area is taken as a reference, the pipe section in front is adjusted by adjusting the direction of the jacking force and improving the integrity of the pipe section to improve the pipe section misalignment phenomenon, thereby improving the sealing and aesthetics of the pipe section channel, and the construction is simple. The actual engineering application proves that the effect is very good. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the application of the present invention;

[0012] Figure 2 This is a schematic diagram of the pipe segment misalignment of the present invention;

[0013] Figure 3 This is a drawing showing the effect of the pipe segment being tied together according to the present invention;

[0014] Figure 4 This is a schematic diagram of the oil cylinder adjusting the front head slope angle of the present invention;

[0015] Figure 5 It is a schematic diagram of the slope angle of the oil cylinder after adjustment of the present invention;

[0016] Figure 6 It is a schematic diagram of the plugging wedge of the present invention;

[0017] Figure 7 for Figure 6 Side view of.

[0018] In the figure: 1. Soft soil layer; 2. Reinforcement area; 3. Soft and hard joint; 4-1. Front adjacent pipe section; 4-2. Pipe section to be adjusted; 4-3. Rear adjacent pipe section; 5. Oil cylinder; 6. Rear backrest; 7. Embedded steel plate; 8-1. Diagonal tie rod I; 8-2. Diagonal tie rod II; 9. Wedge; 10. Offset. DETAILED DESCRIPTION

[0019] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0020] See also Figure 1 to Figure 7 A construction method for handling misalignment in rectangular pipe jacking construction in soft soil layers, comprising a pipe section 4-2 to be adjusted, the pipe section 4-2 to be adjusted is located at the junction of the reinforcement area 2 and the soft soil layer 1, and there is a misalignment 10 between the adjacent pipe section 4-1 in front of it. The misalignment 10 is handled in the jacking process by the following method:

[0021] 1) Use inclined tie rods Ⅰ8-1 to fix the side walls of the pipe section 4-2 to be adjusted and the adjacent pipe section 4-1 in front of it together, and use inclined tie rods Ⅱ8-2 to fix the side walls of the pipe section 4-2 to be adjusted and the adjacent pipe section 4-3 behind it together, please refer to Figure 3 , so that the front, middle and rear three pipe sections form a whole, thereby slowing down the settlement of the pipe section 4-2 to be adjusted when entering the soft soil layer, and reducing the risk of the pipe section 4-2 to be adjusted falling when it is pushed into the soft and hard connection point 3, thereby effectively improving the pipe section misalignment phenomenon.

[0022] 2) By adding a wedge 9 between the oil cylinder 5 and the backrest 6, the direction of the jacking force output by the oil cylinder 5 is consistent with the designed jacking axis, and the downward component of the jacking force output by the oil cylinder is equal to the design value, eliminating the adverse effect of the change in the downward component of force on the misalignment, reducing the misalignment amplitude and meeting the design requirements. In this embodiment, in order to prevent the pipe jacking machine from head-diving when entering the soft soil layer through the reinforcement area, the slope angle of the oil cylinder 5 is adjusted to 0.7% when the pipe jacking machine enters the hole. After the pipe jacking machine passes through the reinforcement area, in order to improve the misalignment, the slope angle of the oil cylinder 5 is adjusted to 1.38%, so that the direction of the jacking force output by the oil cylinder 5 is consistent with the designed jacking axis. Please refer to Figure 4 and Figure 5 .

[0023] The more preferred solution of this embodiment is as follows:

[0024] The diagonal tie rod member I8-1 and the diagonal tie rod member II8-2 are made of channel steel, but are not limited thereto. They may also be made of other profiles such as angle steel, or flat steel.

[0025] The inclined tie rods I8-1 and II8-2 are high in front and low in the back. Under the action of the jacking force, the front adjacent pipe section 4-1 presses down the front pipe section 4-2 to be adjusted, and the rear adjacent pipe section 4-3 pulls down the rear pipe section 4-2 to be adjusted, so as to reduce the misalignment. However, it is not limited to this connection method. In special cases, it can also be connected with the embedded steel plate in the middle of the side of the pipe section.

[0026] The ends of the oblique tie rods Ⅰ8-1 and Ⅱ8-2 are connected and fixed to the corresponding pipe segment embedded steel plates 7 by three-sided welding, and the connection is stable and reliable.

[0027] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A construction method for handling misalignment in rectangular pipe jacking construction in soft soil, comprising a pipe section to be adjusted, the pipe section to be adjusted is located at the junction of the reinforcement area and the soft soil layer, and there is a misalignment between the adjacent pipe section in front of it. It is characterized in that The misalignment is handled during the jacking process by the following methods: 1) The pipe section to be adjusted is fixedly connected to the two side walls of the adjacent pipe section in front of it by using inclined tie rods I, and the pipe section to be adjusted is fixedly connected to the two side walls of the adjacent pipe section behind it by using inclined tie rods II, 2) By adding a wedge between the cylinder and the rear backrest, the direction of the cylinder's output jacking force is made consistent with the designed jacking axis.

2. The construction method for handling jacking misalignment in rectangular jacking pipe construction in soft soil according to claim 1, characterized in that: The inclined tie rod member I and the inclined tie rod member II are made of channel steel.

3. The construction method for handling jacking misalignment in rectangular jacking pipe construction in soft soil according to claim 1, characterized in that: The oblique tie rod member I and the oblique tie rod member II are higher in the front and lower in the back.

4. The construction method for handling jacking misalignment in rectangular jacking pipe construction in soft soil according to claim 3, characterized in that: The ends of the inclined tie rod member I and the inclined tie rod member II are connected and fixed to the corresponding pipe segment embedded steel plates by three-sided welding.

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