Combined pile composite foundation suitable for soft foundation containing liquefied soil layer
The combined pile foundation treatment method, which integrates grid enclosure walls and pipe piles, solves the problems of pollution and complex construction in the treatment of liquefied soil layers, and achieves rapid, environmentally friendly and efficient improvement of foundation bearing capacity.
Patent Information
- Application Number
- CN202423077725.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-13
AI Technical Summary
Existing technologies generate wastewater and sludge pollution when treating liquefied soil layers, especially when working in cohesive soils. This can potentially impact the environment and the safety of surrounding buildings. Furthermore, the construction process is complex and costly.
The composite foundation adopts a combination of grid enclosure walls and pipe piles. The grid enclosure walls eliminate liquefaction, the pipe piles improve the bearing capacity, and the cement-soil cushion layer connects them into a whole to form a grid structure, avoiding excavation and replacement and simplifying the construction process.
It enables rapid improvement of foundation bearing capacity without causing foundation settlement and environmental pollution, meeting building requirements, and is simple, fast, and environmentally friendly to construct.
Smart Images
Figure CN223577068U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of hydraulic engineering construction, especially relates to a combined pile composite foundation suitable for containing liquefied soil layer soft ground. BACKGROUND
[0002] The site of hydraulic structure is mostly saturated sand layer or silt layer which is liquefied. When the seismic intensity of the site is higher than 6 degrees, the liquefied soil layer of the building foundation needs to be treated, and the bearing capacity of the natural ground is also difficult to meet the stress requirement of the building foundation, so the composite foundation treatment for eliminating liquefaction and improving bearing capacity is needed.
[0003] When the thickness of the liquefied soil layer is thin and the buried depth is small, the excavation replacement method is mostly used to treat the ground for eliminating liquefaction and improving bearing capacity.
[0004] When the thickness of the liquefied soil layer is thick and the buried depth is large, the excavation replacement engineering is not feasible or the cost is huge, and the vibration compaction pile and the compaction gravel pile are mostly used for treatment.
[0005] The vibration compaction pile and the compaction gravel pile are encryption methods, and the principle is to compact, compact and replace the liquefied soil layer through vibration, and the sand gravel or gravel well formed by the pile backfill material can make the water of the liquefied soil layer drain away to dissipate the pore water pressure and compact the stratum, so as to eliminate liquefaction. However, the encryption method will discharge a large amount of sewage and sludge during the construction process, especially when the construction is carried out in the clay, which may cause certain pollution to the environment and is limited in the densely populated area. During the construction process of the encryption method, the settlement will occur in the site and the surrounding area within a certain range, which will have an adverse effect on the safety of the buildings near the site. CONTENT OF THE UTILITY MODEL
[0006] In view of the problems in the prior art, the utility model aims at providing a combined pile composite foundation suitable for containing liquefied soil layer soft ground.
[0007] In order to solve the above problems, the utility model adopts the following technical scheme:
[0008] A combined pile composite foundation suitable for containing liquefied soil layer soft ground, comprising a cement soil mattress, a plurality of pipe piles and a plurality of partition walls, the plurality of partition walls are vertically arranged in the ground to form a lattice structure enclosing wall for separating the ground into a lattice structure, the lower end of the lattice structure enclosing wall extends below the liquefied soil layer, the plurality of pipe piles are vertically arranged in the lattice of the lattice structure enclosing wall and extend downward, and the cement soil mattress is laid on the top of the lattice structure enclosing wall to connect the lattice structure enclosing wall and the plurality of pipe piles into one body.
[0009] Preferably, the partition wall is made of a plurality of adjacent cement soil mixing piles.
[0010] Preferably, the diameter of the cement-soil mixing pile is D, and the center distance between adjacent cement-soil mixing piles is D-0.2m.
[0011] Preferably, the net distance between the parallel partition walls is greater than 0.8 times the thickness of the liquefied soil layer.
[0012] Preferably, the cement-soil cushion layer is made of cement-soil with a thickness of 0.5m-1.0m and a compaction degree of not less than 95%.
[0013] Preferably, the upper end of the pipe pile is inserted into the cement-soil cushion layer by 0.2m.
[0014] The utility model discloses the beneficial effect:
[0015] Compared with the prior art, the utility model has the advantages of:
[0016] The utility model discloses a combined pile composite foundation adopting the combination of lattice enclosure and pipe pile, eliminates stratum liquefaction by adopting the lattice enclosure, and improves the bearing capacity of the foundation to meet the requirements of the building by adopting the pipe pile. This composite foundation treatment method is simple in construction, fast in speed, convenient in inspection, reliable in quality, good in foundation treatment effect, does not cause the foundation settlement to affect the safety of the surrounding buildings, and does not produce sewage, sludge and other environmental pollution. DRAWINGS
[0017] Fig. 1 It is the plane schematic drawing of the utility model;
[0018] Fig. 2 It is the elevation schematic drawing of the utility model. CONCRETE EMBODIMENT
[0019] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0020] As Figs. 1-2 shown, the utility model provides a technical scheme: a combined pile composite foundation suitable for soft weak foundation with liquefied soil layer, comprising cement-soil cushion layer 1, a plurality of pipe piles 2 and a plurality of partition walls 3, the plurality of partition walls 3 are vertically arranged in the ground with mutual spacing and longitudinal and transverse interlacing to form lattice enclosure wall 4 that divides the foundation into a lattice structure, the lower end of the lattice enclosure wall 4 extends below the liquefied soil layer, the plurality of pipe piles 2 are vertically arranged and downwardly extended in the lattice of the lattice enclosure wall 4, and the cement-soil cushion layer 1 is laid on the top of the lattice enclosure wall 4 to connect the lattice enclosure wall 4 and the plurality of pipe piles 2 into one body.
[0021] The utility model discloses a lattice enclosure wall 4 is below the liquefied soil layer and divides the site foundation into lattice structure, and the enclosure is formed to the surrounding wall 3 of every lattice and upper and lower non-liquefied soil layer, and the liquefied soil layer is enclosed in a closed box, and the soil in the box does not produce shear strain and will not liquefy when the earthquake occurs, and the pipe pile 2 is used in the lattice of lattice enclosure wall 4 and is reinforced to the foundation, and the bearing capacity of the foundation is improved to meet the requirement of building, and the cement soil mattress 1 is used and is connected as a whole to form the surface of foundation with lattice enclosure wall 4 and several pipe piles 2.
[0022] The utility model discloses a combined pile composite foundation of lattice enclosure and pipe pile combination, adopts lattice enclosure and eliminates stratum liquefaction, and the construction is convenient, does not need to occupy land and has little influence to surrounding environment and building, and the bearing capacity of the foundation is improved to meet the requirement of building with pipe pile. This composite foundation treatment method is simple, fast, convenient and reliable, and the effect of foundation treatment is good, and will not cause the settlement of foundation and influence the safety of surrounding building, and will not produce sewage, sludge and other environmental pollution. The combined pile composite foundation of lattice enclosure and pipe pile combination is suitable for the foundation treatment of the soft soil and fine sand liquefied soil layer of silt soil in hydraulic building foundation, especially the building of high retaining wall, pump station and other high bearing capacity requirements, and is a kind of composite foundation treatment mode with reasonable structure, reliable quality, fast construction speed and environment-friendly.
[0023] Specifically, the surrounding wall 3 is made of cement soil mixing pile, which is simple, fast, convenient and reliable. The diameter of the cement soil mixing pile is D, and the center distance between adjacent cement soil mixing piles is D-0.2m, which can form a closed effect. The lattice enclosure is arranged along the edge of the building, and the net spacing of the parallel surrounding walls 3 is greater than 0.8 times the thickness of the liquefied soil layer.
[0024] The arrangement, size and length of the pipe pile 2 are determined by calculation according to the stress requirements of the building foundation and the stratum conditions of the site.
[0025] Specifically, the cement soil mattress 1 is made of cement soil with a thickness of 0.5m to 1.0m and a compaction degree of not less than 95%, and the upper end of the pipe pile 2 is inserted into the cement soil mattress 1 by 0.2m.
[0026] The utility model discloses a construction time is short, effectual when construction, first construction pipe pile, then implement cement soil mixing pile lattice enclosure, pipe pile adopts rigid pile, and cement soil mixing pile hardening needs the age period of about 90 days. If first construction cement soil mixing pile, then construction pipe pile, need to wait for cement soil mixing pile hardening, need to wait for 3 months time, and pipe pile causes the extrusion of the earth mass in the enclosure, and it is favorable to the improvement of bearing capacity and liquefied soil layer reduction, but has the adverse effect to lattice enclosure. After pipe pile and cement soil mixing pile construction are completed, carry out cement soil mattress layer and plain concrete cushion construction, and composite foundation treatment is finished, can carry out building construction.
[0027] Although the embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, replacements and transformations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A composite pile foundation suitable for soft soil foundations containing liquefiable soil layers, characterized in that, The structure includes a cement-soil cushion layer (1), several pipe piles (2) and several partition walls (3). The partition walls (3) are spaced apart from each other and are vertically set in a crisscross pattern below the ground to form a grid enclosure wall (4) that divides the foundation into a grid structure. The lower end of the grid enclosure wall (4) extends below the liquefiable soil layer. Several pipe piles (2) are distributed in the grid of the grid enclosure wall (4) and extend vertically downward. The cement-soil cushion layer (1) is laid flat on the top of the grid enclosure wall (4) to connect the grid enclosure wall (4) and the several pipe piles (2) into one unit.
2. The composite pile foundation for soft soil foundations containing liquefiable soil layers as described in claim 1, characterized in that, The partition wall (3) is made of several adjacent and intersecting cement-soil mixing piles.
3. A composite pile foundation suitable for soft foundations containing liquefiable soil layers according to claim 2, characterized in that, The diameter of the cement-soil mixing pile is D, and the center distance between adjacent cement-soil mixing piles is D-0.2m.
4. A composite pile foundation suitable for soft foundations containing liquefiable soil layers according to claim 1, characterized in that, The net spacing between parallel partition walls (3) is greater than 0.8 times the thickness of the liquefied soil layer.
5. A composite pile foundation suitable for soft foundations containing liquefiable soil layers according to claim 1, characterized in that, The cement-soil mattress layer (1) is made of cement-soil with a thickness of 0.5m to 1.0m and a compaction degree of not less than 95%.
6. A composite pile foundation suitable for soft foundations containing liquefiable soil layers according to claim 1, characterized in that, The upper end of the pipe pile (2) is inserted into the cement-soil mattress layer (1) by 0.2m.