Site bearing structure in wet soft soil area and construction method thereof

Abstract

The application relates to the technical field of building construction, in particular to a wet soft soil area site bearing structure and a construction method thereof. The application relates to a wet soft soil area site bearing structure which comprises a concrete coaming, a concrete bottom plate, a backfill soil layer, a gravel water permeation layer and a sand layer; the concrete bottom plate is fixedly connected with the concrete coaming; the backfill soil layer is provided with a drainage pipe ditch, and a ventilation drainage pipe is arranged in the drainage pipe ditch; a water collecting plate is further arranged on the backfill soil layer; the gravel water permeation layer is arranged above the ventilation drainage pipe, and the sand layer is arranged above the gravel layer; a lawn planting soil layer is arranged above the sand layer. The application further relates to a construction method of the wet soft soil area site bearing structure. By pouring the concrete bottom plate, adopting the sand layer and the gravel water permeation layer and arranging the drainage pipe ditch on the backfill soil layer, the bearing capacity and the drainage capacity of the wet soft soil area site can be effectively improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of building construction, in particular to a site bearing structure in a wet soft soil area and a construction method thereof. BACKGROUND

[0002] The application provides a site bearing structure in a wet soft soil area and a construction method thereof, which can effectively improve the bearing capacity and drainage performance of the site, so that the site has the performance of not being prone to subsidence and rapid drainage, thereby effectively improving the applicability of the site and reducing the maintenance difficulty and cost.

[0003] In a first aspect, the application provides a site bearing structure in a wet soft soil area, which adopts the following technical scheme:

[0004] The site bearing structure in the wet soft soil area comprises a concrete coaming and a concrete bottom plate, a backfill soil layer, a gravel water permeation layer and a sand layer which are sequentially arranged from bottom to top inside the concrete coaming; the concrete bottom plate is fixedly connected with the concrete coaming.

[0005] The backfill soil layer is provided with a drainage pipe trench, and a ventilation and drainage pipe is laid in the drainage pipe trench.

[0006] The gravel water permeation layer is laid above the ventilation and drainage pipe, and the sand layer is laid above the gravel layer.

[0007] A lawn planting soil layer is arranged above the sand layer.

[0008] By pouring the concrete bottom plate, the effect of anti-floating pressure bearing is achieved, and the bearing capacity of the site in the wet soft soil area is effectively improved. The sand layer, the gravel water permeation layer and the drainage pipe trench arranged on the backfill soil layer are adopted, so that rainwater can quickly penetrate into the drainage pipe trench, the drainage effect inside the site is effectively improved, and the ventilation and drainage pipe can be connected with a sewer arranged in the site, so that the purpose of rapid drainage is achieved.

[0009] Preferably, a waterproof isolation layer is laid in the drainage pipe trench, and the waterproof isolation layer comprises double-layer geotextile and a waterproof membrane, and the waterproof membrane is arranged inside the double-layer geotextile.

[0010] By adopting the above technical scheme, the setting of the geotextile can improve the wear resistance and other construction performance of the waterproof isolation layer, and facilitates laying, the waterproof membrane can effectively improve the drainage effect of the drainage pipe trench and prevent water from penetrating downward, and the stability of the backfill soil layer below is ensured.

[0011] Preferably, a water collecting plate is further arranged on the backfill layer, the water collecting plate is located between two adjacent drain trenches and is laid on the waterproof isolation layer; a plurality of vertical plates are arranged on the water collecting plate, the plurality of vertical plates are arranged at intervals and are uniformly distributed on the water collecting plate; and the gravel water permeable layer is filled in the gaps between the plurality of vertical plates.

[0012] By adopting the technical scheme, on one hand, the water collecting plate can improve the rainwater collecting effect, so that the rainwater is more easily collected into the drain trench, and the drainage effect is improved. On the other hand, the vertical plate can stabilize the gravel water permeable layer to some extent, so that the bearing capacity of the gravel water permeable layer is improved.

[0013] Preferably, the water collecting plate is fixedly connected with the concrete curb.

[0014] By adopting the technical scheme, the water collecting plate can be connected with the concrete curb by screwing or the like, so that the stability of the water collecting plate is effectively improved, the water collecting plate is less likely to deviate, and the bearing capacity of the bearing structure of the site in the humid soft soil area is improved.

[0015] Preferably, a gravel cushion layer is laid in the drain trench, the ventilation drain pipe is arranged on the gravel cushion layer, and the gravel water permeable layer extends into the gap between the side wall of the ventilation drain pipe and the side wall of the drain trench.

[0016] By adopting the technical scheme, the setting of the gravel cushion layer facilitates the slope finding of the ventilation drain pipe. In addition, the stability of the ventilation drain pipe is improved. The gravel water permeable layer extends and is filled in the interior of the drain trench, so that the ventilation drain pipe is stabilized, and the ventilation drain pipe is less likely to roll or slide.

[0017] Preferably, water permeable gauze is arranged in the gravel water permeable layer.

[0018] By adopting the technical scheme, the water permeable gauze divides the gravel water permeable layer into an upper half layer and a lower half layer. Since the sand layer is laid on the upper side of the gravel water permeable layer, the fine sand in the sand layer can enter the internal gap of the upper half layer, and the water permeable gauze can prevent the sand in the sand layer from entering the lower half layer, so that the gravel water permeable layer has excellent water permeability. In addition, the fine sand enters the upper half layer, so that the compactness of the upper half layer is improved, the stability of the transition area between the sand layer and the gravel water permeable layer is improved, and the bearing capacity of the gravel water permeable layer is effectively improved.

[0019] Preferably, a grid mat is further arranged in the sand layer, the grid mat is located on the side of the sand layer close to the lawn planting soil layer, and the grid mat abuts against the concrete curb.

[0020] By adopting the technical scheme, the grid mat can guarantee the integrity of the sand layer, thereby improving the support of the sand layer to the lawn planting soil layer, preventing local collapse of the site, and guaranteeing the water permeability of the sand layer; the periphery of the grid mat abuts against the concrete curb.

[0021] In another aspect, the application provides a site anti-floating and anti-settlement construction method in a wet soft soil area, which adopts a site bearing structure in the wet soft soil area and comprises the following steps:

[0022] Excavate the earthwork to form a foundation pit, and pour a concrete bottom plate at the bottom of the foundation pit;

[0023] Backfill the original soil and tamp it;

[0024] Excavate a drainage pipe trench to a designed depth, and ensure that the trench bottom is smooth and clean; use loose soil to pave the bottom of the drainage pipe trench and make the drainage pipe trench reach the designed slope, and the area of the loose soil paving is tamped flat by a tamping machine;

[0025] Cover a waterproof isolation layer at the drainage pipe trench;

[0026] Install a ventilation and drainage pipe;

[0027] Backfill gravel as a gravel water permeation layer and level it;

[0028] Pave a sand layer to avoid the influence of soil compaction on drainage and ventilation after the site is used;

[0029] Pave a lawn planting soil layer.

[0030] By adopting the technical scheme, the earthwork excavation, concrete bottom plate pouring, original soil backfilling, drainage pipe trench excavation, waterproof isolation layer paving, ventilation and drainage pipe installation, gravel water permeation layer paving, sand layer paving, and lawn planting soil layer paving are sequentially performed, thereby completing the construction of the site bearing structure in the wet soft soil area, which can effectively guarantee the bearing performance of the site bearing structure in the wet soft soil area, thereby meeting the requirements of site anti-floating and anti-settlement. Moreover, the drainage performance of the site can be effectively improved, the practicality is improved, and the maintenance cost is reduced.

[0031] Preferably, the concrete curb is poured at the same time as the concrete bottom plate is poured;

[0032] When the ventilation and drainage pipe is installed, the ventilation and drainage pipe is sloped, and the ventilation and drainage pipe reaches the designed slope.

[0033] By adopting the technical scheme, the concrete curb can effectively improve the bearing performance of the site bearing structure in the wet soft soil area and improve the anti-floating and anti-settlement performance.

[0034] In summary, the application has at least one of the following beneficial technical effects:

[0035] 1. The effect of anti-floating pressure is realized by pouring the concrete bottom plate, which effectively improves the bearing capacity of the site in the wet soft soil area. Sand layer, gravel water permeable layer, and drainage pipe trench are arranged on the backfill soil layer, so that rainwater can quickly penetrate into the drainage pipe trench, effectively improving the drainage effect inside the site. The ventilation and drainage pipe can be connected with the sewer arranged in the site, so as to realize the purpose of rapid drainage;

[0036] 2. The water collection effect is improved by setting the water collecting plate, so that the rainwater can be more easily collected in the drainage pipe trench, thereby improving the drainage effect. A plurality of vertical plates are arranged on the water collecting plate, which are arranged along the width direction of the drainage pipe trench, so as to guide the accumulated water, and the vertical plates can also better maintain the gravel, thereby improving the stability of the gravel water permeable layer;

[0037] 3. The water permeable gauze is arranged in the gravel water permeable layer, which divides the gravel water permeable layer into upper and lower layers. Since the sand layer is arranged above the gravel water permeable layer, the fine sand in the sand layer can enter the internal space of the upper layer, and the water permeable gauze can prevent the sand in the sand layer from entering the lower layer, thereby ensuring that the gravel water permeable layer has excellent water permeability. And the fine sand enters the upper layer, improving the compactness of the upper layer;

[0038] 4. The grid mat is arranged in the sand layer, which can ensure the integrity of the sand layer, thereby improving the support of the sand layer to the lawn planting soil layer, ensuring that the site is not prone to local collapse, and the grid mat can also ensure the water permeability of the sand layer.

[0039] 5. During construction, the earthwork excavation, concrete bottom plate pouring, original soil backfilling, drainage pipe trench excavation, waterproof isolation layer laying, ventilation and drainage pipe installation, gravel water permeable layer laying, sand layer laying, and lawn planting soil layer laying are carried out in sequence, so as to complete the construction of the site bearing structure in the wet soft soil area, which can effectively ensure the bearing performance of the site bearing structure in the wet soft soil area, thereby meeting the requirements of site anti-floating and anti-settlement. And it can effectively improve the drainage performance of the site, improve the practicality, and reduce the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structural schematic view of the site bearing structure in the wet soft soil area in the embodiment of the application;

[0041] Figure 2 is a position and structure schematic view of the water collecting plate in the embodiment of the application;

[0042] Figure 3 is a structure schematic view of the grid mat in the embodiment of the application.

[0043] Marked in the drawing: 1, concrete coaming; 2, concrete bottom plate; 3, backfill layer; 31, drainage pipe trench; 32, waterproof isolation layer; 33, gravel cushion; 34, ventilation and drainage pipe; 4, water collecting plate; 41, vertical plate; 5, gravel water permeable layer; 51, water permeable gauze; 6, sand layer; 61, grating cushion plate; 7, lawn planting soil layer. DETAILED DESCRIPTION

[0044] The following will be described in detail in combination with the accompanying drawings Figures 1-3 The application will be further described in detail.

[0045] The embodiment of the application discloses a site bearing structure in a wet soft soil area. Figure 1 The site bearing structure in the wet soft soil area comprises a concrete coaming 1 and, from bottom to top, a concrete bottom plate 2, a backfill layer 3, a gravel water permeable layer 5, a sand layer 6 and a lawn planting soil layer 7 which are sequentially arranged in the concrete coaming 1. The surface of the backfill layer 3 is provided with a drainage pipe trench 31, and the drainage pipe trench 31 is paved with a waterproof isolation layer 32.

[0046] The lawn planting soil layer 7 is used for planting lawns. The sand layer 6 can avoid the increase of the compactness of the site after use, thereby affecting the drainage and ventilation. The gravel water permeable layer 5 can ensure that rainwater can permeate into the drainage pipe trench 31, and the drainage pipe trench 31 can make the rainwater be drained out.

[0047] Referring to Figure 1 The concrete coaming 1 and the concrete bottom plate 2 are both cast in place and integrally formed. First, a foundation pit needs to be excavated, the concrete bottom plate 2 is poured at the bottom of the foundation pit, and the concrete coaming 1 is poured at the sidewall of the foundation pit.

[0048] The original soil is backfilled on the upper part of the concrete bottom plate 2 to form the backfill layer 3. The cross section of the drainage pipe trench 31 is trapezoidal. The bottom wall of the drainage pipe trench 31 is arranged in a certain slope to facilitate the improvement of the drainage effect. The drainage pipe trench 31 is arranged in parallel with multiple drainage pipe trenches. The waterproof isolation layer 32 comprises double-layer geotextile and a waterproof film arranged in the double-layer geotextile, and the waterproof film is preferably a polyethylene film. The arrangement of the geotextile can improve the wear resistance and other construction performances of the waterproof isolation layer 32, is convenient for paving, the waterproof film can effectively improve the drainage effect of the drainage pipe trench 31 and can prevent water from permeating downward, thereby ensuring the stability of the backfill layer 3 below.

[0049] The gravel cushion 33 is paved on the bottom wall of the drainage pipe trench 31 and is located above the waterproof isolation layer 32. The ventilation and drainage pipe 34 is arranged on the gravel cushion 33. The ventilation and drainage pipe 34 can be connected with the sewer arranged in the site, thereby achieving the purpose of rapid drainage.

[0050] Referring to Figure 1 and Figure 2The backfill layer 3 is further provided with a water collecting plate 4 located between two adjacent drain trenches 31 and laid above the waterproof isolation layer 32. The water collecting plate 4 can improve the rainwater collecting effect and make the rainwater more easily flow into the drain trench 31, thereby improving the drainage effect. The water collecting plate 4 is fixedly connected with the concrete curb 1 to maintain the stability of the water collecting plate 4 and prevent the water collecting plate from being deviated. The water collecting plate 4 is provided with a plurality of vertical plates 41 arranged along the width direction of the drain trench 31 to guide the water. The plurality of vertical plates 41 are arranged at intervals and uniformly distributed on the water collecting plate 4.

[0051] In the embodiment of the present application, in order to improve the stability of the water collecting plate 4, the two ends of the water collecting plate 4 in the length direction are fixedly connected with the concrete curb 1. The connection mode can adopt anchor bolt connection or use the concrete post-cast strip to connect the water collecting plate 4 and the concrete curb 1.

[0052] Referring to Figure 1 The gravel water permeable layer 5 is laid above the ventilation and drainage pipe 34. The gravel in the gravel water permeable layer 5 extends and fills into the gap between the side wall of the ventilation and drainage pipe 34 and the side wall of the drain trench 31 and the gap between the plurality of vertical plates 41, thereby fixing the ventilation and drainage pipe 34 and preventing the ventilation and drainage pipe from rolling or sliding. In addition, the plurality of vertical plates 41 can better maintain the gravel, thereby improving the stability of the gravel water permeable layer 5.

[0053] The gravel water permeable layer 5 is provided with a water permeable gauze 51 which divides the gravel water permeable layer into an upper half layer and a lower half layer. Since the sand layer 6 is laid above the gravel water permeable layer 5, the fine sand in the sand layer 6 can enter the internal gap of the upper half layer, and the water permeable gauze 51 can prevent the sand in the sand layer 6 from entering the lower half layer, thereby ensuring that the gravel water permeable layer 5 has excellent water permeability. In addition, the fine sand enters the upper half layer, improving the compactness of the upper half layer, thereby improving the stability of the transition area between the sand layer 6 and the gravel water permeable layer 5 and effectively improving the bearing capacity of the gravel water permeable layer 5.

[0054] Referring to Figure 1 and Figure 3 The sand layer 6 is further provided with a grid mat 61 located on the side of the sand layer 6 close to the lawn planting soil layer 7. In order to improve the stability of the grid mat 61, the periphery of the grid mat 61 abuts against the concrete curb 1. The grid mat 61 can ensure the integrity of the sand layer 6, thereby improving the support of the sand layer 6 to the lawn planting soil layer 7 and preventing the site from being locally collapsed. In addition, the grid mat 61 can also ensure the water permeability of the sand layer 6.

[0055] The implementation principle of the site bearing structure in the wet soft soil area in the embodiments of the present application is as follows: the effect of anti-floating pressure bearing is realized by pouring the concrete bottom plate 2, and the bearing capacity of the site in the wet soft soil area is effectively improved. The sand layer 6, the gravel water permeable layer 5, and the drainage pipe trench 31 arranged on the backfill soil layer 3 are used, so that the rainwater can quickly penetrate into the drainage pipe trench 31, and the drainage effect inside the site is effectively improved.

[0056] The embodiments of the present application also disclose a construction method of a site bearing structure in a wet soft soil area.

[0057] The construction method of the site bearing structure in the wet soft soil area comprises the following steps.

[0058] Excavate the earthwork to form a foundation pit, and pour the concrete bottom plate 2 and the concrete surrounding plate 1 at the bottom of the foundation pit;

[0059] Backfill the original soil and compact it to form the backfill soil layer 3, and the height of the backfilled original soil is higher than the position of the drainage pipe trench 31;

[0060] Excavate the drainage pipe trench 31 on the backfill soil layer 3 to reach the design depth, and ensure that the trench bottom of the drainage pipe trench 31 is smooth and clean; the bottom of the drainage pipe trench 31 is padded with scattered soil to reach the design slope, and the area of the scattered soil padding is compacted and leveled by a tamper machine;

[0061] Cover the waterproof isolation layer 32 at the drainage pipe trench 31;

[0062] Install the ventilation and drainage pipe 34, and make the ventilation and drainage pipe 34 reach the design slope, so as to ensure the drainage effect;

[0063] Install the water collecting plate 4;

[0064] Backfill the gravel as the gravel water permeable layer 5 and level it; first, backfill the lower half layer, and then backfill the upper half layer after laying the water-permeable gauze 51 on the surface of the lower half layer;

[0065] Lay the sand layer 6, and arrange the grid mat 61 in the sand layer 6 to avoid the influence of the compacted soil on the drainage and ventilation after the site is used;

[0066] Lay the lawn planting soil layer 7.

[0067] The embodiments of the specific embodiments are the preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A bearing structure for wet soft soil areas, characterized by: It comprises a concrete enclosure (1) and a concrete base plate (2), a backfill soil layer (3), a crushed stone seepage layer (5) and a sand layer (6) located inside the concrete enclosure (1) and arranged in sequence from bottom to top; the concrete base plate (2) is fixedly connected to the concrete enclosure (1); The backfill soil layer (3) is provided with a drainage ditch (31), and a ventilation drainage pipe (34) is laid in the drainage ditch (31); the crushed stone water seepage layer (5) is laid above the ventilation drainage pipe (34), and the sand layer (6) is laid above the crushed stone layer; A lawn planting soil layer (7) is provided above the sand layer (6); A waterproof isolation layer (32) is laid in the drainage ditch (31), and the waterproof isolation layer (32) includes a double-layer geotextile and a waterproof membrane, and the waterproof membrane is arranged inside the double-layer geotextile; A water collecting plate (4) is also provided on the backfill soil layer (3), and the water collecting plate (4) is located between two adjacent drainage trenches (31) and is laid above the waterproof isolation layer (32); a plurality of vertical plates (41) are provided on the water collecting plate (4), and the plurality of vertical plates (41) are arranged at intervals and evenly distributed on the water collecting plate (4); the gravel seepage layer (5) is filled in the gaps between the plurality of vertical plates (41); A water-permeable gauze (51) is provided inside the crushed stone water-permeable layer (5); the water-permeable gauze (51) separates the crushed stone water-permeable layer (5) into an upper half layer and a lower half layer; fine gravel in the sand layer (6) can enter the internal gaps of the upper half layer, and the water-permeable gauze (51) can prevent the gravel in the sand layer (6) from continuing to enter the lower half layer.

2. The site bearing structure for wet soft soil areas according to claim 1, characterized in that: The water collecting plate (4) is fixedly connected to the concrete enclosure plate (1).

3. The bearing structure for wet soft soil areas according to claim 1, characterized in that: A gravel cushion layer (33) is laid in the drainage ditch (31), and the ventilation drainage pipe (34) is arranged on the gravel cushion layer (33); the crushed stone seepage layer (5) extends to the gap between the side wall of the ventilation drainage pipe (34) and the side wall of the drainage ditch (31).

4. The site bearing structure for wet soft soil areas according to claim 1, characterized in that: A grid pad (61) is further provided inside the sand layer (6), and the grid pad (61) is located on a side of the sand layer (6) close to the lawn planting soil layer (7); the grid pad (61) abuts against the concrete enclosure plate (1).

5. A construction method for a bearing structure in a wet soft soil area according to any one of claims 1 to 4; And includes the following steps: Excavation is performed to form a foundation pit, and a concrete base plate is poured at the bottom of the foundation pit (2); Backfill the original soil and compact it; Excavating the drainage ditch (31) to a designed depth, ensuring that the bottom of the drainage ditch (31) is smooth and clean; using loose soil to pave the bottom of the drainage ditch (31) and making the drainage ditch (31) reach a designed slope, and using a tamping machine to compact the area where the loose soil is pave; Covering the drainage ditch (31) with a waterproof isolation layer (32); Install the ventilation and drainage pipe (34); install the water collecting plate (4); Backfilling gravel as a gravel seepage layer (5) and leveling; Lay a sand layer (6) to prevent the soil from becoming compacted after use, which could affect drainage and ventilation. Lay the lawn planting soil layer.

6. The construction method of the bearing structure in a wet soft soil area according to claim 5, characterized in that: Casting the concrete enclosure (1) while casting the concrete base plate (2); When the ventilation and drainage pipe (34) is installed, the ventilation and drainage pipe (34) is sloped and the ventilation and drainage pipe (34) is made to reach the designed slope.

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