Cloth bag pile with inflatable film bag

Abstract

The utility model discloses a cloth bag pile with an inflatable membrane bag, which comprises a reinforcement cage, a cast-in-place concrete pile body and the inflatable membrane bag arranged according to the position and the size of a karst cave, and the inflatable membrane bag is of an annular bag body structure and is sleeved on the periphery of the reinforcement cage; the inflatable membrane bag comprises an inner side PVDF membrane and an outer side PVDF membrane, and a membrane bag inflation cavity is formed between the inner side PVDF membrane and the outer side PVDF membrane in the inflatable membrane bag; according to the cloth bag pile, the karst cave is blocked through the inflatable film bag, so that the problem of pile foundation lateral displacement caused by inconsistent stretching of the two sides of the karst cave area can be effectively avoided, and the construction stability of the cloth bag pile is improved; therefore, the cloth bag pile with the inflatable film bag is novel in design, the problem of lateral deviation of the pile foundation during construction can be effectively avoided, and the construction stability of the cloth bag pile is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cloth bag piles, in particular to a cloth bag pile with an inflatable film bag. Background Art

[0002] For a cloth bag pile, a columnar hole is first vertically drilled at the pile position by a drilling machine, then a cloth bag equipped with a grouting pipe is placed into the columnar hole, and then cement slurry is injected into the cloth bag. The grouting pressure can reach 2 Mpa. When the strength of the cement slurry reaches a certain level, the whole pile forms a column, thus forming a cloth bag pile.

[0003] The Chinese utility model patent with the patent number: ZL202220249402.5 and the patent name: A cloth bag pile with a steel bar cage for adjusting the position of the cloth bag discloses the following technical solution. Specifically: A cloth bag pile with a steel bar cage for adjusting the position of the cloth bag includes a steel bar cage, a cast-in-place concrete pile body, and a geotextile bag. The geotextile bag is arranged outside the steel bar cage corresponding to the karst cave position when it is lowered into the pile hole. The steel bar cage corresponding to the karst cave position is connected to the geotextile bag. Sealing structures are arranged at both the upper and lower ends of the geotextile bag, and deformable stirrups are arranged in the middle of the geotextile bag; the cast-in-place concrete pile body forms a pile after injecting concrete through a grouting pipe; the geotextile bag is connected to the steel bar cage through a cloth bag connecting ring arranged.

[0004] It should be noted that during the construction process of the above-mentioned cloth bag pile with a steel bar cage for adjusting the position of the cloth bag, its construction steps include:

[0005] First step, first bind the support longitudinal bars and fixed stirrups to make a steel bar cage, then match the corresponding geotextile bag according to the position and size of the karst cave detected in advance, and connect the geotextile bag and the steel bar cage by using a cloth bag connecting ring;

[0006] Second step, carry out pile foundation lofting and positioning, bury the casing, and form a pile hole with a drill bit of an appropriate diameter;

[0007] Third step, slowly lower the steel bar cage containing the geotextile bag into the pile hole by hoisting;

[0008] Fourth step, inject concrete into the pile hole through the grouting pipe. The deformable stirrups are opened by the injected concrete, and the geotextile bag is opened by the injected concrete and several deformable stirrups;

[0009] Fifth step, after the grouting is completed, pull out the grouting pipe, and the concrete hardens to form a pile, namely the cast-in-place concrete pile body;

[0010] Sixth step, after the construction of the cloth bag pile is completed, inspect the effect of the formed pile. After meeting the requirements, the next construction can be carried out.

[0011] It should be noted that for the bag-shaped pile with an adjustable fabric position steel cage described above, it has the following defects. Specifically, since the geotextile bag can undergo large expansion deformation, under the action of a large grouting pressure, if the sizes and depths of the karst caves on both sides of the pile foundation are inconsistent, it will cause the pile foundation to deflect laterally, thereby affecting the stability of the construction of the bag-shaped pile. Summary of the Invention

[0012] The purpose of the present invention is to provide a bag-shaped pile with an inflatable film bag in view of the deficiencies of the prior art. The bag-shaped pile with an inflatable film bag has a novel design, and uses the inflatable film bag to fit against the inner wall of the pile hole to achieve the plugging of the karst cave, and can effectively avoid the problem of lateral deflection of the pile foundation during construction.

[0013] To achieve the above purpose, the present invention is realized through the following technical solutions.

[0014] A bag-shaped pile with an inflatable film bag includes a steel reinforcement cage and a cast-in-place concrete pile body, and the steel reinforcement cage and the cast-in-place concrete pile body jointly form a pile foundation;

[0015] The bag-shaped pile with an inflatable film bag further includes an inflatable film bag arranged according to the position and size of the karst cave. The inflatable film bag is a ring-shaped bag structure, and the inflatable film bag is sleeved on the periphery of the steel reinforcement cage;

[0016] The inflatable film bag includes an inner PVDF film and an outer PVDF film located outside the inner PVDF film. The upper edge part of the inner PVDF film and the upper edge part of the outer PVDF film are sealed and welded by a hot melt process. The lower edge part of the inner PVDF film and the lower edge part of the outer PVDF film are sealed and welded by a hot melt process. An air-filled film bag inflation cavity is formed inside the inflatable film bag between the inner PVDF film and the outer PVDF film; an air injection hole for inflating the film bag inflation cavity is arranged at the upper end part of the inflatable film bag;

[0017] The inner PVDF film and the outer PVDF film respectively include a base fabric layer woven from polyester filaments and a coating layer formed by coating PVDF (polyvinylidene fluoride) on the surface of the base fabric layer.

[0018] Wherein, restraint points are respectively welded to the upper end part and the lower end part of the inflatable film bag;

[0019] A number of steel bar support collars are sleeved on the periphery of the steel reinforcement cage and are arranged at intervals from top to bottom in sequence. The distance between the steel bar support collar and the steel reinforcement cage is greater than 50 mm. The steel bar support collar is fixedly welded to the steel reinforcement cage through steel bars. The upper end part and the lower end part of the inflatable film bag are respectively tied and fixed to the corresponding steel bar support collars at the corresponding positions through the corresponding restraint points.

[0020] Among them, the area of the inner PVDF membrane is determined according to the actual height of the karst cave and the perimeter of the pile foundation. The unfolded width of the inner PVDF membrane is 1.1 times the perimeter of the pile foundation. The height of the inner PVDF membrane extends at least 50 cm upward and downward according to the height of the karst cave, and the height of the inner PVDF membrane is at least 1 m greater than the height of the karst cave.

[0021] The height of the inner PVDF membrane is the same as that of the outer PVDF membrane, and the unfolded width of the outer PVDF membrane is at least 2 times the perimeter of the pile foundation to ensure that the outer PVDF membrane can expand outward significantly after inflation and fit the karst cave.

[0022] Among them, when the height of the karst cave is greater than 2 m, the inflatable membrane bag is provided with annular restraint belts, and the vertical distance between adjacent annular restraint belts is 1 m.

[0023] The annular restraint belt includes a base fabric layer woven from polyester filaments and a coating layer formed by coating the surface of the base fabric layer with PVDF (polyvinylidene fluoride). The length of the annular restraint belt is 1.5 times the perimeter of the pile foundation, the width of the annular restraint belt is 10 cm, and the thickness of the annular restraint belt is 1 mm.

[0024] Compared with the prior art, the present utility model has the following beneficial effects. Specifically, for the bagged pile with an inflatable membrane bag of the present utility model, it seals the karst cave through the inflatable membrane bag. When pouring and forming the concrete pile body, since the inflatable membrane bag has sealed the karst cave, it can effectively avoid the problem of pile foundation lateral displacement caused by inconsistent stretching on both sides of the karst cave area, thereby improving the stability of the construction of the bagged pile. Therefore, the bagged pile with an inflatable membrane bag of the present utility model has the advantage of novel design, can effectively avoid the problem of lateral deviation of the pile foundation during construction, and improve the stability of the construction of the bagged pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following uses the drawings to further illustrate the present utility model, but the embodiments in the drawings do not constitute any limitation to the present utility model.

[0026] Figure 1 It is a schematic structural diagram of the bagged pile of the present utility model.

[0027] Figure 2 It is a partial structural schematic diagram of the bagged pile of the present utility model.

[0028] Figure 3 It is a schematic structural diagram of the bagged pile of the present utility model from another perspective.

[0029] In Figures 1 to 3 it includes:

[0030] 1 - Steel reinforcement cage; 2 - Inflatable membrane bag; 3 - Steel bar support collar; 4 - Binding belt; 5 - Concrete cover gap. Detailed implementation mode

[0031] The present utility model will be described below in conjunction with specific implementation modes.

[0032] Example 1, as Figures 1 to 3 shown, a cloth bag pile with an inflatable membrane bag includes a steel reinforcement cage 1 and a cast-in-place concrete pile body, and the steel reinforcement cage 1 and the cast-in-place concrete pile body together form a pile foundation.

[0033] Among them, as Figures 1 to 3 shown, the cloth bag pile with an inflatable membrane bag further includes an inflatable membrane bag 2 provided according to the position and size of the karst cave. The inflatable membrane bag 2 is an annular bag structure, and the inflatable membrane bag 2 is sleeved on the periphery of the steel reinforcement cage 1.

[0034] Furthermore, the inflatable membrane bag 2 includes an inner PVDF membrane and an outer PVDF membrane located outside the inner PVDF membrane. The upper edge part of the inner PVDF membrane and the upper edge part of the outer PVDF membrane are sealed and welded by a hot melt process. The lower edge part of the inner PVDF membrane and the lower edge part of the outer PVDF membrane are sealed and welded by a hot melt process. A membrane bag inflation cavity filled with gas is formed inside the inflatable membrane bag 2 between the inner PVDF membrane and the outer PVDF membrane; an air injection hole for inflating the membrane bag inflation cavity is provided at the upper end part of the inflatable membrane bag 2.

[0035] Even further, the inner PVDF membrane and the outer PVDF membrane respectively include a base fabric layer woven from polyester filaments and a coating layer formed by coating PVDF (polyvinylidene fluoride) on the surface of the base fabric layer.

[0036] In addition, the performance requirements of the inner PVDF membrane are as follows: the unit mass is 1200 g / m 2 , the designed tensile strength is 120 kN / m, the designed tensile stress is 120 MPa, and the thickness is at least 1 mm. The performance requirements of the outer PVDF membrane are as follows: the unit mass is 1000 g / m 2 , the designed tensile strength is 100 kN / m, the designed tensile stress is 100 MPa, and the thickness is at least 0.8 mm.

[0037] It should be noted that for the inflatable membrane bag 2 of this Example 1, due to the difference in performance between the inner PVDF membrane and the outer PVDF membrane; compared with the inner PVDF membrane, the tensile strength and the tensile stress that the outer PVDF membrane can bear are both smaller than those of the inner and outer PVDF membranes. When the inflatable membrane bag 2 is inflated, the entire inflatable membrane bag 2 will expand radially outward, and the outer PVDF membrane will combine with the inner wall of the pile hole and block the karst cave.

[0038] For the cloth bag pile with an inflatable membrane bag in the first embodiment, the following construction method can be adopted. Specifically, a construction method for a cloth bag pile with an inflatable membrane bag includes the following steps:

[0039] Step a: Prepare the steel reinforcement cage 1;

[0040] Step b: Prepare the above-mentioned inflatable membrane bag 2;

[0041] Step c: Sleeve the inflatable membrane bag 2 around the periphery of the steel reinforcement cage 1, and the installation position of the inflatable membrane bag 2 is determined according to the position of the karst cave;

[0042] Step d: Drill a hole;

[0043] Step e: Place the steel reinforcement cage 1 with the inflatable membrane bag 2 installed into the pile hole;

[0044] Step f: Inject gas into the membrane bag inflation cavity through the air injection hole of the inflatable membrane bag 2;

[0045] Step g: Pour concrete into the pile hole to form a cast-in-place concrete pile body, so as to complete the construction of the cloth bag pile.

[0046] It should be emphasized that in the first embodiment, the karst cave is blocked by the inflatable membrane bag 2. When the cast-in-place concrete pile body is formed by pouring, since the karst cave has been blocked by the inflatable membrane bag 2, the problem of pile foundation lateral displacement caused by inconsistent stretching on both sides of the karst cave area can be effectively avoided, thereby improving the stability of the cloth bag pile construction.

[0047] Based on the above situation, it can be seen that the cloth bag pile with an inflatable membrane bag in the first embodiment has the advantage of novel design, and the inflatable membrane bag 2 is used to fit against the inner wall of the pile hole to achieve the blocking of the karst cave, and the problem of lateral displacement of the pile foundation during construction can be effectively avoided.

[0048] Embodiment 2, as Figure 2 and Figure 3 shown, restraint points are respectively welded to the upper end and the lower end of the inflatable membrane bag 2.

[0049] Among them, a number of steel bar support rings 3 are sleeved around the periphery of the steel reinforcement cage 1 at intervals from top to bottom. The distance between the steel bar support rings 3 and the steel reinforcement cage 1 is greater than 50 mm. The steel bar support rings 3 are welded and fixed to the steel reinforcement cage 1 through steel bars. The upper end and the lower end of the inflatable membrane bag 2 are respectively tied and fixed to the steel bar support rings 3 at the corresponding positions through the corresponding restraint points.

[0050] According to the requirements of the "Technical Code for Building Foundation Piles" (JGJ 94-2018), the thickness of the concrete protective layer of the pile foundation is generally not less than 50 mm; to ensure the thickness of the above-mentioned concrete protective layer, it is required that there is a concrete protective layer gap 5 between the inflatable membrane bag 2 and the steel reinforcement cage 1, and the concrete protective layer gap 5 needs to maintain a distance of more than 50 mm; in the second embodiment, by setting the steel bar support collar 3, the dimensional requirements of the concrete protective layer gap 5 can be effectively ensured.

[0051] Embodiment 3, the difference between this Embodiment 3 and Embodiment 1 is that: the area of the inner PVDF membrane is determined according to the actual height of the karst cave and the perimeter of the pile foundation, the unfolded width of the inner PVDF membrane is 1.1 times the perimeter of the pile foundation, the height of the inner PVDF membrane extends at least 50 cm upward and downward according to the height of the karst cave, and the height of the inner PVDF membrane is at least 1 m larger than the height of the karst cave;

[0052] The height of the inner PVDF membrane is the same as the height of the outer PVDF membrane, and the unfolded width of the outer PVDF membrane is at least 2 times the perimeter of the pile foundation to ensure that the outer PVDF membrane can expand outward greatly after inflation and fit with the karst cave.

[0053] Embodiment 4, as Figure 2 and Figure 3 shown, the difference between this Embodiment 4 and Embodiment 1 is that: when the height of the karst cave is greater than 2 m, the inflatable membrane bag 2 is provided with a circular restraint band 4, and the vertical distance between adjacent circular restraint bands 4 is 1 m;

[0054] The circular restraint band 4 includes a base fabric layer woven from polyester filaments and a coating layer formed by coating PVDF (polyvinylidene fluoride) on the surface of the base layer. The length of the circular restraint band 4 is 1.5 times the perimeter of the pile foundation, the width of the circular restraint band 4 is 10 cm, and the thickness of the circular restraint band 4 is 1 mm.

[0055] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A bag pile with an inflatable membrane bag, comprising a steel cage (1) and a cast-in-place concrete pile body, wherein the steel cage (1) and the cast-in-place concrete pile body together constitute a pile foundation; Features: The bag pile with an inflatable film bag also includes an inflatable film bag (2) arranged according to the location and size of the cave, the inflatable film bag (2) being an annular bag structure, and the inflatable film bag (2) being sleeved on the periphery of the steel cage (1); The inflatable film bag (2) comprises an inner PVDF film and an outer PVDF film located outside the inner PVDF film, the upper edge of the inner PVDF film and the upper edge of the outer PVDF film are sealed and fused by a hot-melt process, the lower edge of the inner PVDF film and the lower edge of the outer PVDF film are sealed and fused by a hot-melt process, and a film bag inflation cavity for filling gas is formed inside the inflatable film bag (2) between the inner PVDF film and the outer PVDF film; the upper end of the inflatable film bag (2) is provided with an injection hole for filling the film bag inflation cavity with gas; The inner PVDF membrane and the outer PVDF membrane respectively include a base fabric layer woven from polyester filaments and a coating layer formed by coating PVDF polyvinylidene fluoride on the surface of the base layer.

2. The bag pile with an inflatable film bag according to claim 1, characterized in that: The upper end and the lower end of the inflatable film bag (2) are respectively welded with restraint points; The outer periphery of the steel cage (1) is provided with a plurality of steel support collars (3) arranged in sequence from top to bottom, the spacing between the steel support collars (3) and the steel cage (1) is greater than 50 mm, the steel support collars (3) are fixed to the steel cage (1) by welding the steel bars, and the upper end and the lower end of the inflatable membrane bag (2) are respectively tied and fixed to the steel support collars (3) at corresponding positions through corresponding restraint points.

3. The bag pile with an inflatable film bag according to claim 1, characterized in that: The area of ​​the inner PVDF membrane is determined according to the actual cave height and the perimeter of the pile foundation. The unfolded width of the inner PVDF membrane is 1.1 times the perimeter of the pile foundation. The height of the inner PVDF membrane is extended by at least 50 cm upward and downward according to the cave height, and the height of the inner PVDF membrane is at least 1 m greater than the cave height. The height of the inner PVDF membrane is the same as that of the outer PVDF membrane, and the unfolded width of the outer PVDF membrane is at least twice the circumference of the pile foundation to ensure that the outer PVDF membrane can expand outward significantly after inflation and fit the cave.

4. The bag pile with an inflatable film bag according to claim 1, characterized in that: When the height of the cave is greater than 2 m, the inflatable membrane bag (2) is provided with an annular restraining belt (4), and the upper and lower spacings of adjacent annular restraining belts (4) are 1 m; The annular restraint belt (4) comprises a base fabric layer woven from polyester filaments and a coating layer formed by coating PVDF polyvinylidene fluoride on the surface of the base layer. The length of the annular restraint belt (4) is 1.5 times the circumference of the pile foundation. The width of the annular restraint belt (4) is 10 cm. The thickness of the annular restraint belt (4) is 1 mm.

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