Construction method for collapse of ground-connected wall trench in soft soil
By increasing the specific gravity of mud and sectional construction in the soft soil strata, the problem of trough wall collapse affecting construction is solved, and the effect of accelerating construction speed and reducing resource waste is achieved.
Patent Information
- Application Number
- CN202411713192.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-04-04
AI Technical Summary
The walls of the soft soil strata are prone to collapse, affecting the normal construction of the ground wall. The existing remedial measures take a long time, resulting in delays in construction periods and waste of resources.
Increase the specific gravity of mud in the trough section, detect the collapsed area, clean the collapsed soil, lay iron sheets on the side of the steel cage facing the collapsed area, lower the steel cage, first backfilling part of the soil, then pour part of the concrete, and construct in sections until the concrete is poured to the set elevation.
Through segmented construction and iron isolation, we can avoid concrete overload, speed up the construction speed, reduce waste of manpower and material resources, and solve the problem of collapse of the trough wall of the ground connection wall trough section affecting normal construction.
Smart Images
Figure CN119754313A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of ground-connected wall construction, in particular to a construction method for ground-connected wall groove wall collapse in soft soil strata. Background Art
[0002] Infrastructure construction often involves a lot of underground content, and the underground soil conditions in different regions are complex. Ground-connected wall construction is more commonly used in retaining structures. Ground-connected wall construction has the advantages of high rigidity, good integrity, high anti-seepage and durability, and reliable quality, and can be applied to a variety of foundation conditions. Its application field is relatively wide, such as the outer wall of the underground part of super-high-rise or high-rise buildings, subways, underground parking lots, etc., which plays a very important role; during the construction of ground-connected walls, due to the complex and changeable geological conditions, it is impossible to accurately guarantee the excavation quality. Local soil collapse is prone to occur during the excavation process. There are many reasons for the collapse, such as insufficient mud density, too fast drilling speed or the drill bit colliding with the slot wall, which has an adverse effect on subsequent construction work and is prone to quality risks.
[0003] In view of the causes of the collapse of the ground-anchored wall, there are many remedial measures. The conventional practice is generally to backfill and wait for the self-compactness of the soil to reach the conditions for excavation. However, this method takes a long time, which not only delays the construction period but also wastes manpower and material resources. Summary of the invention
[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a construction method for preventing the collapse of the trench wall of a ground-connecting wall in a soft soil layer, so as to solve the problem in the prior art that the trench wall of a ground-connecting wall in a soft soil layer is prone to collapse, which affects the normal construction of the ground-connecting wall.
[0005] To achieve the above object, the present invention provides a construction method for treating the collapse of the trench wall of a ground diaphragm wall in a soft soil layer. Based on the collapse of the trench wall of the trench section to be constructed, the normal construction of the ground diaphragm wall of the trench section is continued. The construction method comprises the following steps:
[0006] S1, increase the mud density in the trough section;
[0007] S2, detecting the collapsed area in the trough section;
[0008] S3, clean up the collapsed soil in the trench section;
[0009] S4. Cover the steel cage with iron sheets on the side facing the collapsed area;
[0010] S5, lower the steel cage;
[0011] S6, backfill part of the soil into the collapsed area and pour part of the concrete into the steel cage;
[0012] S7, repeat step S6 until the concrete is poured to the set elevation, and the construction is completed after the concrete solidifies.
[0013] By adopting this technical solution, after the trench wall collapses in the trench section to be constructed, the iron sheet is fully laid on the side of the steel cage facing the collapsed area based on increasing the mud density in the trench section and clearing the trench. After the steel cage is lowered, the segmented construction is carried out by backfilling part of the soil first and then pouring part of the concrete. The isolation effect of the iron sheet on the backfill soil and concrete is used to avoid over-cubic volume of concrete, and the soil backfilling in the collapsed area and the concrete pouring of the ground-connected wall can be completed in sequence, thereby speeding up the construction speed, reducing the waste of manpower and material resources, and solving the problem of the collapse of the trench wall of the ground-connected wall affecting the normal construction of the ground-connected wall.
[0014] Furthermore, the step S2 includes: using an ultrasonic instrument to perform ultrasonic detection in the trench section, and stopping increasing the mud density after determining that the soil in the collapsed area is stable.
[0015] By adopting this technical solution, the mud gravity can be controlled and the problem of excessive mud gravity can be avoided.
[0016] Furthermore, the step S2 also includes: using an ultrasonic instrument to perform ultrasonic testing in the slot section to determine the slot wall collapse position and maximum collapse depth in the slot section.
[0017] By adopting this technical solution, the location of trench wall collapse is determined to provide a prerequisite for subsequent treatment of the collapse location; the maximum depth of collapse is determined to determine the minimum fill height, which is convenient for subsequent control of the initial pouring amount of concrete.
[0018] Furthermore, the step S4 includes: determining a side of the steel cage that faces the collapsed area after the steel cage is lowered, fully covering the surface of the steel cage with iron sheets, and connecting the iron sheets with each other and with the steel cage by welding.
[0019] By adopting this technical solution, it is ensured that the fully-laid iron sheet can be lowered into the trench section along with the steel cage, and the iron sheet is used to block the inside and outside of the steel cage, so as to avoid the problem of large amounts of over-cubic concrete caused by the collapse of the trench wall in the trench section.
[0020] Furthermore, the top elevation of concrete after pouring part of the concrete into the steel cage in step S6 should be less than the top elevation of backfill soil after backfilling part of the soil into the collapsed area.
[0021] By adopting this technical solution, the backfill soil will support the iron sheet on the surface of the steel cage to ensure the stability of the concrete on the other side of the iron sheet after pouring, and avoid the problem of concrete over-squareness caused by the iron sheet being squeezed and deformed by concrete, as well as uneven surface of the wall in the later stage.
[0022] Compared with the prior art, the present invention has the following beneficial effects:
[0023] Iron sheets are fully laid on the side of the steel cage facing the collapsed trench wall, and the backfilling of the collapsed area and the pouring of concrete for the ground-anchored wall are carried out simultaneously by adopting a segmented construction method in the height direction. This will speed up the construction progress, reduce the waste of manpower and material resources caused by the collapse of the trench wall in the trench section, and solve the problem of the collapse of the trench wall in the trench section of the ground-anchored wall affecting the normal construction of the ground-anchored wall. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 The present invention is a flow chart of the construction method for the collapse of the ground-connected wall trench in the soft soil layer. DETAILED DESCRIPTION
[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0026] Please see attached Figure 1 The present invention provides a construction method for the collapse of the trench wall of the ground-connected wall in a soft soil layer. Based on the collapse of the trench wall in the trench section to be constructed, the normal construction of the ground-connected wall in the trench section is continued. The construction method comprises the following steps: S1, increasing the specific gravity of the mud in the trench section; S2, detecting the collapsed area in the trench section; S3, cleaning the collapsed soil in the trench section; S4, fully spreading iron sheets on the side of the steel cage facing the collapsed area; S5, lowering the steel cage; S6, backfilling part of the soil into the collapsed area, and pouring part of the concrete into the steel cage at the same time; S7, repeating step S6 until the concrete is poured to the set elevation, and the construction is completed after the concrete is solidified;
[0027] After the trench wall collapses in the trench section to be constructed, iron sheets are fully laid on the side of the steel cage facing the collapsed area based on increasing the mud density in the trench section and clearing the trench. After the steel cage is lowered, the segmented construction is carried out by backfilling part of the soil first and then pouring part of the concrete. The isolation effect of the iron sheet on the backfill soil and concrete is used to avoid over-cubic volume of concrete, and the soil backfilling in the collapsed area and the concrete pouring of the ground-connected wall can be completed in sequence, so as to speed up the construction speed, reduce the waste of manpower and material resources, and solve the problem of the collapse of the trench wall of the ground-connected wall trench section affecting the normal construction of the ground-connected wall.
[0028] In some embodiments, preferably, the step S2 includes: using an ultrasonic instrument to perform ultrasonic detection in the trench section, and stopping increasing the mud density after determining that the soil in the collapsed area is stable; achieving control of the mud density to avoid the problem of excessive mud density;
[0029] Furthermore, step S2 also includes: using an ultrasonic instrument to perform ultrasonic detection in the trench section to determine the trench wall collapse position and the maximum collapse depth in the trench section; determining the trench wall collapse position to provide a prerequisite for subsequent treatment of the collapse position; determining the maximum collapse depth to determine the minimum fill height, so as to facilitate subsequent control of the initial pouring amount of concrete.
[0030] In some embodiments, preferably, step S4 includes: determining the side of the steel cage facing the collapsed area after the steel cage is lowered, fully covering the side surface of the steel cage with iron sheets, and connecting the iron sheets with each other and with the steel cage by welding; ensuring that the fully covered iron sheets can be lowered into the slot section with the steel cage, and using the iron sheets to block the inside and outside of the steel cage to avoid the problem of large amounts of concrete over-cubic due to the collapse of the slot wall in the slot section.
[0031] In some embodiments, preferably, the top elevation of the concrete after pouring part of the concrete into the steel cage in step S6 should be lower than the top elevation of the backfill soil after backfilling part of the soil into the collapsed area; the backfill soil will support the iron sheet on the surface of the steel cage to ensure the stability of the concrete on the other side of the iron sheet after pouring, and avoid the problem of over-square concrete and uneven surface of the wall caused by the extrusion and deformation of the iron sheet by the concrete.
[0032] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.
Claims
1. A construction method for treating the collapse of the trench wall of a ground-connected wall in a soft soil layer, wherein the normal construction of the ground-connected wall of the trench section to be constructed is continued based on the collapse of the trench wall of the trench section to be constructed, characterized in that: The construction method comprises the following steps: S1, increase the mud density in the trough section; S2, detecting the collapsed area in the trough section; S3, clean up the collapsed soil in the trench section; S4. Cover the steel cage with iron sheets on the side facing the collapsed area; S5, lower the steel cage; S6, backfill part of the soil into the collapsed area and pour part of the concrete into the steel cage; S7, repeat step S6 until the concrete is poured to the set elevation, and the construction is completed after the concrete solidifies.
2. The construction method for preventing the collapse of the ground-connected wall trench in soft soil according to claim 1, characterized in that: The step S2 includes: using an ultrasonic instrument to perform ultrasonic detection in the trench section, and stopping increasing the mud density after determining that the soil in the collapsed area is stable.
3. The construction method for preventing the collapse of the ground-connected wall trench in soft soil according to claim 1, characterized in that: The step S2 also includes: using an ultrasonic instrument to perform ultrasonic testing in the slot section to determine the slot wall collapse position and maximum collapse depth in the slot section.
4. The construction method for preventing the collapse of the ground-connected wall trench in soft soil according to claim 1, characterized in that: The step S4 comprises: determining the side of the steel cage facing the collapsed area after the steel cage is lowered, fully covering the surface of the steel cage with iron sheets, and connecting the iron sheets with each other and with the steel cage by welding.
5. The construction method for preventing the collapse of the ground-connected wall trench in soft soil according to claim 1, characterized in that: The top elevation of concrete after pouring part of concrete into the steel cage in step S6 should be less than the top elevation of backfill soil after backfilling part of the soil into the collapsed area.