A foundation reinforcing device for crossing a karez

Abstract

The utility model discloses a kind of foundation reinforcement devices for crossing karez, including several groups of pile foundation being arranged in vertical shaft four around;Each group of the pile foundation is provided with a bearing platform;The surface of the bearing platform is provided with a stand column;The upper end of the stand column is provided with a support;The surface of each support is connected with an orthotropic panel assembly;The surface of the orthotropic panel assembly is filled with a road basic body.In design, the risk of karez collapse is considered, and pretreatment is carried out on the device, that is, the height of the stand column is reasonably raised, so that the upper orthotropic panel is gradually in a void state, and the risk is released in advance.

Description

Technical Field

[0001] This utility model relates to a foundation reinforcement device, specifically a foundation reinforcement device for crossing karez wells, belonging to the field of geotechnical engineering technology. Background Technology

[0002] The karez system, one of the three great ancient engineering feats of China, is known as the "Underground Great Wall." It is a water conveyance system distributed in arid and semi-arid regions, serving as a unique irrigation system for desert areas, and is widely distributed in the Turpan region of Xinjiang. Its structure mainly consists of vertical shafts, underground channels, and surface channels. Its function is to collect groundwater from higher altitudes, as well as melted snow and rainwater from the mountains, and transport it through underground channels to settlement areas. The vertical shafts and surface channels then supply drinking water and irrigation for farmland. Karez systems are also found in Central Asia and West Asia, and have a long history.

[0003] With economic development and the advancement of the Belt and Road Initiative, railway construction in Northwest China has accelerated in speed and efficiency. From an economic and social development perspective, simply crossing karez wells by bridges would necessitate the use of large-span bridges due to the need for elevated track levels, leading to a sharp increase in project investment. Currently, railway construction increasingly uses roadbeds to cross underground engineering structures, such as urban subway tunnels, culverts, mining subsidence areas, and karst caves. This inevitably results in intersections with the underlying structures. Since karez wells are vital water channels in the region, railway construction over them must ensure that the wells are not damaged or that their normal operation is not affected; otherwise, the losses outweigh the gains. Meanwhile, due to the unique structure of the karez and the significant impact of water on the soil's mechanical properties, the construction of the upper roadbed has a substantial influence on the overall structure of the lower karez. To ensure the strength, stiffness, and stability of the karez, as well as the safety of the upper roadbed, in addition to reinforcing the roadbed structure (such as adding reinforcing strips along the track direction and using higher-performance roadbed materials), it is even more important to control potential hazards at the source by isolating the karez from the roadbed to prevent interference between them. However, if a pile-slab structure is used for foundation reinforcement, it can easily lead to voids at the bottom of the slab, causing roadbed settlement. Therefore, it is necessary to design a reinforcement and isolation measure for the foundations related to railway roadbed crossings of karez projects. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a foundation reinforcement device for crossing karez wells, thereby reducing engineering investment, preventing well collapse, ensuring roadbed strength, and preventing settlement.

[0005] The technical solution adopted by this utility model is as follows: a foundation reinforcement device for crossing a karez well, comprising several sets of pile foundations arranged around the shaft; a pile cap is provided on each set of pile foundations; a column is provided on the surface of the pile cap; a support is provided at the upper end of the column; the surface of each support is in contact with an orthotropic panel assembly; the surface of the orthotropic panel assembly is filled with roadbed body.

[0006] Furthermore, each group of piles is a bored cast-in-place pile; each group has 4 piles; and the column is a concrete column.

[0007] Furthermore, both the foundation and the column are prefabricated; the upper end of the column is higher than the soil surface; and the bottom of the foundation has pre-drilled pile holes corresponding to the pile foundation.

[0008] Furthermore, the aforementioned foundation, column, and support are mutually anchored.

[0009] Furthermore, the orthotropic panel assembly includes a steel panel; the bottom of the steel panel is provided with longitudinal ribs.

[0010] Furthermore, the longitudinal ribs are U-shaped ribs; a crossbeam is also provided at the bottom of the longitudinal ribs; the crossbeams are staggered with the longitudinal ribs; and the steel panel, longitudinal ribs, and crossbeams are connected by bolts.

[0011] Furthermore, the upper end of the support is connected to a fixed joint; the fixed joint is provided with a transverse groove relative to the crossbeam; longitudinal grooves are provided on both sides of the transverse groove; the bottom of the crossbeam is inserted into the transverse groove; the bottom of the longitudinal rib is inserted into the longitudinal groove.

[0012] This invention offers the following advantages: The risk of karez well collapse was considered during the design phase, and pre-treatment was implemented in the device by appropriately raising the height of the support columns, gradually allowing the upper orthotropic panels to become detached, thus mitigating the risk in advance. Simultaneously, it directly controls the source of danger, isolating the railway subgrade from the karez well, reducing the frequency of using large-span bridges over karez well sections and saving on project investment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the construction environment for this utility model.

[0014] Figure 2 This is a schematic diagram of the orthotropic panel assembly.

[0015] Figure 3 This is a schematic diagram of the side structure of this utility model.

[0016] Figure 4 This is a schematic diagram of the cross-sectional structure of the support.

[0017] Wherein: 1 is pile foundation, 2 is pile cap, 3 is column, 4 is support, 4-1 is fixed joint, 4-11 is horizontal groove, 4-12 is longitudinal groove, 5 is steel panel, 6 is longitudinal rib, 7 is crossbeam, 8 is open channel, 9 is culvert, 10 is aquifer, and 11 is vertical shaft. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] See Figures 1-4 This application discloses a foundation reinforcement device for crossing a karez well, comprising several sets of pile foundations arranged around a vertical shaft 11; a pile cap 2 is provided on each set of pile foundations 1; a column 3 is provided on the surface of the pile cap 2; a support 4 is provided at the upper end of the column 3; the surface of each support 4 is in contact with an orthotropic panel assembly; the surface of the orthotropic panel assembly is filled with roadbed body.

[0020] Furthermore, each pile foundation 1 in each group is a bored cast-in-place pile; each group has 4 piles; and the column 3 is a concrete column.

[0021] Furthermore, both the foundation 2 and the column 3 are prefabricated; the upper end of the column 3 is higher than the soil surface; and the bottom of the foundation 2 has a pre-drilled pile hole corresponding to the pile foundation.

[0022] Furthermore, the foundation 2, column 3 and support 4 are mutually anchored.

[0023] Support 4 connects the orthotropic panel assembly and column 3. Its main function is to transfer the support reaction force of the upper structure to the lower structure, while ensuring that the structure can deform freely under the action of factors such as live load, temperature change, concrete shrinkage and creep, so that the structure meets the deformation requirements.

[0024] Column 3 and pile cap 2 are prefabricated according to the actual site conditions. The upper part of column 3 is 10-30cm higher than the soil, so that the upper orthotropic panel component is in a void state to prevent the roadbed from settling due to the collapse of the karez. Pile holes need to be reserved in the prefabricated pile cap 2. The size of the pile hole below the prefabricated pile cap 2 must be larger than the cross-sectional size of the pile foundation, and the pile hole above the prefabricated pile cap 2 must be larger than the cross-sectional size of the column.

[0025] The pile foundation uses bored cast-in-place piles, with two rows of four piles under each pile cap. The pile depth and pile hole size are determined based on the site geological conditions and the location of the karez well. The purpose is to reinforce the foundation below the karez well culvert and prevent water seepage to the foundation reinforcement device from damaging the structure.

[0026] Furthermore, the orthotropic panel assembly includes a steel panel 5; the bottom of the steel panel 5 is provided with longitudinal ribs 6.

[0027] The orthotropic panel assembly is in direct contact with the roadbed. The steel panel 5 is typically 14-18mm thick. The longitudinal ribs 6 are U-shaped ribs, with a typical thickness of 6mm, spaced 1m apart. The transverse beams 7, perpendicular to the longitudinal ribs 6, are typically spaced 3-4m apart. They are connected by high-strength bolts. The roadbed is filled on top of them, and the steel panel 5 bears the upper load, which is then transferred to the lower structure through the device structure.

[0028] Furthermore, the longitudinal rib 6 is a U-shaped rib; a crossbeam 7 is also provided at the bottom of the longitudinal rib 6; the crossbeam 7 and the longitudinal rib 6 are staggered; the steel panel 5, the longitudinal rib 6 and the crossbeam 7 are connected by bolts.

[0029] Furthermore, the upper end of the support 4 is connected to a fixed joint 4-1; the fixed joint 4-1 is provided with a transverse groove relative to the crossbeam 7; longitudinal grooves are provided on both sides of the transverse groove; the bottom of the crossbeam 7 is inserted into the transverse groove 4-11; the bottom of the longitudinal rib 6 is inserted into the longitudinal groove 4-12.

[0030] The specific construction steps are as follows: 1. Based on the site geological conditions and the locations of the karez open channel 8, vertical shaft 1, underground channel 9, and aquifer 10, conduct surveying and setting out, and excavate the foundation pit;

[0031] 2. Based on the actual site conditions, determine the depth and size of the bored piles, and carry out the bored pile pouring. Simultaneously, prefabricate the concrete columns 3 and the pile cap 2, as well as the orthotropic steel panels.

[0032] 3. After the concrete curing period, the assembly construction will proceed. First, hoist the foundation 2, then hoist the column 3, install the support 4, and then hoist the orthotropic steel panel. Secure the various structures tightly to ensure that the structure meets the requirements for strength, rigidity, and stability.

[0033] 4. After construction is completed, the foundation pit is backfilled and compacted, and finally the roadbed is filled.

[0034] This utility model provides a foundation reinforcement device and construction method for railway subgrade crossing karez well projects. It solves the technical problems of significantly raising the railway alignment due to "replacing the road with a bridge" in traditional karez sections, and the tendency for the bottom of the slab to become voided when using traditional pile-slab structures for foundation reinforcement. It also addresses the issue of necessitating the use of large-span bridges, which drastically increases project investment. This utility model features a novel structure, safety and reliability, convenient construction, and cost savings, and has broad application prospects.

[0035] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A foundation reinforcement device for crossing karez wells, characterized in that: It includes several sets of pile foundations set around the shaft; each set of pile foundations is provided with a pile cap; the surface of the pile cap is provided with a column; the upper end of the column is provided with a support; the surface of each support is in contact with an orthotropic panel assembly; the surface of the orthotropic panel assembly is filled with roadbed body.

2. The foundation reinforcement device for crossing karez wells according to claim 1, characterized in that: Each group of piles consists of bored cast-in-place piles; each group has 4 piles; the columns are concrete columns.

3. A foundation reinforcement device for crossing karez wells according to claim 2, characterized in that: Both the foundation and the column are prefabricated; the upper end of the column is higher than the soil surface; and the bottom of the foundation has a pre-drilled pile hole corresponding to the pile foundation.

4. A foundation reinforcement device for crossing karez wells according to claim 3, characterized in that: The aforementioned foundation, column, and support are mutually anchored.

5. A foundation reinforcement device for crossing karez wells according to claim 1, characterized in that: The orthotropic panel assembly includes a steel panel; the bottom of the steel panel is provided with longitudinal ribs.

6. A foundation reinforcement device for crossing karez wells according to claim 5, characterized in that: The longitudinal ribs are U-shaped; a crossbeam is also provided at the bottom of the longitudinal ribs; the crossbeams are staggered with the longitudinal ribs; the steel panel, longitudinal ribs and crossbeams are connected by bolts.

7. A foundation reinforcement device for crossing karez wells according to claim 6, characterized in that: The upper end of the support is connected to a fixed joint; the fixed joint is provided with a transverse groove relative to the crossbeam; longitudinal grooves are provided on both sides of the transverse groove; the bottom of the crossbeam is inserted into the transverse groove; the bottom of the longitudinal rib is inserted into the longitudinal groove.

Images