Construction method of airbag type precipitation well casing and foundation at precipitation well node

Abstract

The present invention discloses an airbag type precipitation well casing and a construction method for the foundation at the precipitation well node. The airbag type precipitation well casing includes: an annular main airbag, which is an annular body in the shape of an inverted frustum; a plurality of annular auxiliary airbags, which are connected to the annular main airbag and are arranged at equal intervals around the periphery of the annular main airbag; a pull ring, which is arranged on the inner wall of the annular main airbag; an air inlet valve, which is arranged on the annular main airbag; and an air outlet valve, which is arranged on the annular main airbag. The airbag type precipitation well casing of the present invention has a small self-weight, is convenient for handling, and has a low transportation cost; has a water stop function, reducing the leakage risk; will not cause a striking accident when toppling over, improving the construction safety; has a good bite with the later concrete when constructing the foundation at the precipitation well node; can be recycled and reused, reducing the project cost, and also has the effects of energy conservation and environmental protection.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a construction method of an airbag type precipitation well casing and a foundation at a precipitation well node. Background Art

[0002] The existing casing of the drainage well in the foundation raft is generally made of steel water-stopping casing; however, with the popularization of high-rise buildings, the design thickness of the foundation raft is generally 0.9 meters to 2 meters, or even more than 2 meters, which leads to the following problems:

[0003] (1) The steel water stop sleeve has a high density (7.85g / cm 3 ), it is heavy and inconvenient to carry manually, so it needs mechanical assistance.

[0004] (2) The steel water stop sleeve has a large aspect ratio and poor self-stability, making it easy to tip over and cause accidents caused by objects hitting it.

[0005] (3) The linear expansion coefficient of the steel waterstop sleeve is similar to that of concrete. However, due to the relatively smooth surface of the waterstop, its adhesion to concrete is poor. The waterstop depends on the waterstop wing ring. The quality of the weld will directly affect the waterstop effect. On-site welding increases the uncertainty of welding quality.

[0006] (4) The secondary pouring of the sealing concrete in the casing of the precipitation well has poor interlocking properties with the original concrete structure. When load is applied later, reflective cracks are easily formed in the surface layer.

[0007] (5) As part of the foundation raft, the steel water-stop sleeve cannot be recycled and the construction cost is high. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a construction method of an airbag-type dewatering well casing and a foundation at a dewatering well node to solve the above technical problem.

[0009] In order to solve the above technical problems, the technical solution of the present invention is: an airbag type dewatering well casing, comprising:

[0010] An annular main airbag, wherein the annular main airbag is an inverted truncated cone-shaped annular body;

[0011] A plurality of annular auxiliary airbags are connected to the annular main airbag and are evenly spaced and distributed around the periphery of the annular main airbag;

[0012] A pull ring, arranged on the inner wall of the annular main airbag;

[0013] An air intake valve, arranged on the annular main air bag;

[0014] An exhaust valve is arranged on the annular main airbag.

[0015] Furthermore, the airbag-type precipitation well casing provided by the present invention further includes:

[0016] An annular groove, which is arranged around the periphery of the lower end of the annular main airbag.

[0017] Furthermore, for the airbag-type precipitation well casing provided by the present invention, the cross-sectional shape of the annular auxiliary airbag is trapezoidal serrated.

[0018] Furthermore, for the airbag-type precipitation well casing provided by the present invention, a plurality of pull rings are symmetrically arranged on the inner wall of the annular main airbag.

[0019] Furthermore, for the airbag-type precipitation well casing provided by the present invention, the pull rings are arranged on the inner wall of the annular main airbag corresponding to the position of the annular auxiliary airbag.

[0020] Furthermore, for the airbag-type precipitation well casing provided by the present invention, the air inlet valve and the air outlet valve are respectively arranged on the upper end surface of the annular main airbag.

[0021] Furthermore, for the airbag-type precipitation well casing provided by the present invention, both the annular main airbag and the annular auxiliary airbag are inflatable and deflatable airbags made of polyvinyl chloride or high-density polyethylene.

[0022] To solve the above technical problems, another technical solution provided by the present invention is: a construction method for the foundation at the precipitation well node, including:

[0023] Construct a foundation cushion at the precipitation well node, and embed a metal collar on the foundation cushion around the precipitation well;

[0024] After inflating the above-mentioned airbag-type precipitation well casing by opening the air inlet valve and closing the air outlet valve, close the air inlet valve and set the airbag-type precipitation well casing on the metal collar around the precipitation well;

[0025] Construct a waterproof layer on the foundation cushion at the precipitation well node;

[0026] Construct a protective layer on the waterproof layer;

[0027] Construct a foundation raft on the protective layer;

[0028] Exhaust the airbag-type precipitation well casing at the precipitation well node by opening the air outlet valve;

[0029] Remove and recycle the exhausted airbag-type precipitation well casing from the foundation raft at the precipitation well node through the pull rings;

[0030] Fill the precipitation well;

[0031] Cover the opening of the precipitation well and weld a sealing steel plate on the metal collar;

[0032] After removing the bladder - type dewatering well casing, pour concrete with a strength grade one level higher into the raft opening formed on the foundation raft to backfill the raft opening with concrete to form a complete foundation raft.

[0033] Furthermore, the construction method of the foundation at the dewatering well node provided by the present invention further includes:

[0034] Before constructing the foundation raft on the protective layer, set a metal hoop in the annular groove of the bladder - type dewatering well casing.

[0035] Furthermore, for the construction method of the foundation at the dewatering well node provided by the present invention, the waterproof layer extends to the periphery of the bladder - type dewatering well casing to the annular groove thereon.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] (1) For the bladder - type dewatering well casing and the construction method of the foundation at the dewatering well node provided by the present invention, the bladder - type dewatering well casing can replace the steel water - stop casing. It has a small self - weight, is convenient for handling, does not require mechanical assistance for handling, and is convenient for transportation through inflation and deflation, reducing its transportation cost.

[0038] (2) For the bladder - type dewatering well casing and the construction method of the foundation at the dewatering well node provided by the present invention, the bladder - type dewatering well casing is an inverted frustum - shaped annular body as a whole. Due to its relatively light overall self - weight, it will not cause a striking accident when it topples over, improving construction safety.

[0039] (3) For the bladder - type dewatering well casing and the construction method of the foundation at the dewatering well node provided by the present invention, the bladder - type dewatering well casing is provided with equally - spaced annular secondary air bladders on the periphery of the annular main air bladder. After pouring concrete to construct the foundation raft, the raft opening formed on the foundation raft after removing the bladder - type dewatering well casing is in an inverted frustum shape and has an annular groove matching the annular secondary air bladder. After pouring concrete with a high strength grade into the raft opening to form a complete foundation raft, the occlusiveness at the junction of the concrete in the early and late stages of the foundation raft construction is good, and cracks are not likely to occur on the surface layer of the foundation raft, improving the construction quality of the foundation raft.

[0040] (4) For the bladder - type dewatering well casing and the construction method of the foundation at the dewatering well node provided by the present invention, by setting equally - spaced annular secondary air bladders on the periphery of the annular main air bladder, the water - stop effect from bottom to top at the dewatering well node can be improved, reducing the risk of groundwater leakage. On the other hand, the sealing steel plate seals the dewatering well after filling, which also reduces the risk of groundwater leakage.

[0041] (5) The airbag type dewatering well casing and the construction method of the foundation at the dewatering well node provided by the present invention can be recycled and reused after use, which not only reduces the project cost, but also has the effect of energy conservation and environmental protection.

[0042] (6) The airbag type dewatering well casing and the construction method of the foundation at the dewatering well node provided by the present invention facilitate the installation and disassembly of the airbag type dewatering well casing through the pull ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic cross-sectional structure diagram of the airbag type dewatering well casing;

[0044] Figures 2 to 5 is a schematic process structure diagram of the construction method of the foundation at the dewatering well node;

[0045] As shown in the figure:

[0046] 100. Airbag type dewatering well casing, 110. Ring-shaped main airbag, 120. Ring-shaped secondary airbag, 130. Pull ring, 140. Air inlet valve, 150. Air outlet valve, 160. Ring-shaped groove;

[0047] 200. Soil mass;

[0048] 300. Dewatering well;

[0049] 400. Foundation;

[0050] 410. Foundation cushion;

[0051] 420. Waterproof layer;

[0052] 430. Protective layer;

[0053] 440. Foundation raft;

[0054] 450. Backfill concrete;

[0055] 500. Metal collar;

[0056] 600. Metal hoop;

[0057] 700. Plugging steel plate;

[0058] 800. Raft opening. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] The present invention will be described in detail below with reference to the accompanying drawings: According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0060] Embodiment 1

[0061] Please refer to Figure 1 , Embodiment 1 of the present invention provides an airbag type precipitation well casing 100, which includes an annular main airbag 110, an annular auxiliary airbag 120, a pull ring 130, an air inlet valve 140, and an air outlet valve 150, wherein:

[0062] The annular main airbag 110, and the annular main airbag 110 is an annular body in the shape of an inverted frustum of a cone.

[0063] The annular auxiliary airbags 120, and there are a plurality of annular auxiliary airbags 120 communicated with the annular main airbag 110, and they are arranged at equal intervals around the periphery of the annular main airbag 110.

[0064] The pull ring 130 is arranged on the inner wall of the annular main airbag 110.

[0065] The air inlet valve 140 is arranged on the annular main airbag 110.

[0066] The air outlet valve 150 is arranged on the annular main airbag 110.

[0067] Please refer to Figure 1 , in order to improve the water stop effect, the airbag type precipitation well casing 100 provided in Embodiment 1 of the present invention may further include:

[0068] The annular groove 160 is arranged around the periphery of the lower end of the annular main airbag 110.

[0069] Please refer to Figure 1 , in order to improve the water stop effect and the bite of the foundation raft 440 at the junction during the construction in the early and later stages, for the airbag type precipitation well casing 100 provided in Embodiment 1 of the present invention, the cross-sectional shape of the annular auxiliary airbag 120 is trapezoidal serrated. On the premise of being able to achieve the above-mentioned water stop and bite, the cross-sectional shape of the annular auxiliary airbag 120 may also be rectangular or other shapes.

[0070] Please refer to Figure 1 , in order to facilitate the removal and recycling of the used airbag type precipitation well casing 100 through the pull ring 130, for the airbag type precipitation well casing 100 provided in Embodiment 1 of the present invention, the pull rings 130 are multiple and symmetrically arranged on the inner wall of the annular main airbag 110. Among them, the pull rings 130 may be arranged on the inner wall of the annular main airbag 110 corresponding to the position of the annular auxiliary airbag 120.

[0071] Please refer to Figure 1 , in order to facilitate inflation and deflation, for the airbag type precipitation well casing 100 provided in Embodiment 1 of the present invention, the air inlet valve 140 and the air outlet valve 150 are respectively arranged on the upper end surface of the annular main airbag 110. Arranging on the upper end surface can also avoid the situation that when arranged on the side surface, it interferes with the pouring elevation of the concrete and causes inability to exhaust air.

[0072] To avoid air leakage of the airbag type dewatering well casing 100 during use, in the airbag type dewatering well casing 100 provided in the first embodiment of the present invention, both the annular main airbag 110 and the annular secondary airbag 120 are inflatable and deflatable airbags made of puncture-resistant materials such as polyvinyl chloride (PVC) or high-density polyethylene (HDPE).

[0073] Embodiment Two

[0074] The second embodiment of the present invention provides a construction method for the foundation at the node of a dewatering well, which may include:

[0075] Step 901, please refer to Figure 2 , construct a foundation cushion 410 at the node of the dewatering well 300, and embed a metal collar 500 on the foundation cushion 410 outside the dewatering well 300. Wherein the dewatering well 300 is located within the soil mass 200.

[0076] Step 902, please refer to Figure 2 , after inflating the airbag type dewatering well casing 100 of the above-mentioned first embodiment by opening the air inlet valve 140 and closing the exhaust valve 150, close the air inlet valve 140 and set the airbag type dewatering well casing 100 on the metal collar 500 outside the dewatering well 300. For the convenience of later concrete pouring, the end with a smaller opening of the airbag type dewatering well casing 100 is set on the metal collar 500, that is, the end with a larger opening is set upward, and the subsequent concrete backfill is facilitated through the through-opening that is larger at the top and smaller at the bottom.

[0077] Step 903, please refer to Figure 2 , construct a waterproof layer 420 on the foundation cushion 410 at the node of the dewatering well 300. To improve the waterproof performance, the waterproof layer 420 extends to the periphery of the airbag type dewatering well casing 100 to the annular groove 160 thereon.

[0078] Step 904, please refer to Figure 2 , construct a protective layer 430 on the waterproof layer 420.

[0079] Step 905, please refer to Figure 2 , construct a foundation raft 440 on the protective layer 430. At this time, the foundation raft 440 has a notch at the node of the airbag type dewatering well casing 100.

[0080] Step 906, exhaust the airbag type dewatering well casing 100 at the node of the dewatering well 300 by opening the exhaust valve 150.

[0081] Step 907, please refer to Figures 2 to 3, the airbag type precipitation well casing 100 after exhausting is taken out and recycled from the foundation raft 440 at the node of the precipitation well 300 through the pull ring 130. After taking out the airbag type precipitation well casing 100, the metal collar 500 is exposed.

[0082] Step 908, please refer to Figure 4 , fill the precipitation well 300. At this time, the materials filled in the precipitation well can be soil, slurry, sand and gravel, etc.

[0083] Step 909, please refer to Figure 4 , cover the hole of the precipitation well 300 and weld the sealing steel plate 700 on the metal collar 500.

[0084] Step 910, please refer to Figures 4 to 5 , after taking out the airbag type precipitation well casing 100, pour concrete with a strength grade one level higher in the raft hole 800 formed on the foundation raft 440 to backfill the raft hole 800 with concrete 450 to form a complete foundation raft 440.

[0085] So far, the construction of the foundation 400 is completed at the node of the precipitation well 300.

[0086] Please refer to Figure 2 、 Figures 4 to 5 , in order to improve the water stop effect, the construction method of the foundation at the node of the precipitation well 300 provided in the second embodiment of the present invention may further include:

[0087] Before step 905, a metal hoop 600 is arranged in the annular groove 160 of the airbag type precipitation well casing 100. The metal hoop 600 can reinforce the annular groove 160 and form a water stop ring on the side facing the center of the precipitation well 300 when pouring the foundation raft 440 with a notch, and together with the water stop ring on the side facing away from the center of the precipitation well 300 formed by the annular auxiliary airbag 120 when pouring the foundation raft 440 with a notch, they constitute internal and external water stop members to achieve a good water stop effect.

[0088] For the airbag type precipitation well casing 100 and the construction method of the foundation at the node of the precipitation well 300 provided in the above embodiments of the present invention, the airbag type precipitation well casing 100 replaces the steel water stop casing. Due to its small self - weight, it is convenient to carry, does not require mechanical assistance for carrying, and is convenient for transportation through inflation and deflation, reducing its transportation cost.

[0089] For the airbag type precipitation well casing 100 and the construction method of the foundation at the node of the precipitation well 300 provided in the above embodiments of the present invention, the airbag type precipitation well casing 100 is an inverted frustum - shaped ring body as a whole. Due to its relatively light overall self - weight, it will not cause a striking accident when it topples over, improving the construction safety.

[0090] The construction method of the foundation at the node of the airbag type precipitation well casing 100 and the precipitation well 300 provided in the above embodiments of the present invention. The airbag type precipitation well casing 100 is provided with annular secondary airbags 120 distributed at equal intervals on the periphery of the annular main airbag 110. After pouring the concrete construction foundation raft 440, the raft opening 800 formed on the foundation raft 440 after removing the airbag type precipitation well casing 100 is in an inverted frustum shape and has an annular groove 160 matching the annular secondary airbag 120. After pouring high-strength concrete into the raft opening 800 to form a complete foundation raft 440, the bite at the junction of the concrete in the early and late construction of the foundation raft 440 is good, and cracks are not easily generated on the surface layer of the foundation raft 440, improving the construction quality of the foundation raft 440.

[0091] The construction method of the foundation at the node of the airbag type precipitation well casing 100 and the precipitation well 300 provided in the above embodiments of the present invention. By arranging annular secondary airbags 120 distributed at equal intervals on the periphery of the annular main airbag 110, the water-stop effect from bottom to top at the node of the precipitation well 300 can be improved, reducing the risk of groundwater leakage. On the other hand, the blocking steel plate 700 blocking the filled precipitation well 300 also reduces the risk of groundwater leakage. Among them Figures 2 to 3 shows the position of the groundwater level line, and its example position is not an absolute position.

[0092] The construction method of the foundation at the node of the airbag type precipitation well casing 100 and the precipitation well 300 provided in the above embodiments of the present invention can be recycled and reused after use, not only reducing the project cost, but also having the effects of energy conservation and environmental protection.

[0093] The construction method of the foundation at the node of the airbag type precipitation well casing 100 and the precipitation well 300 provided in the above embodiments of the present invention facilitates the installation and disassembly of the airbag type precipitation well casing 100 through the pull ring 130.

[0094] The construction method of the foundation at the node of the airbag type precipitation well casing 100 and the precipitation well 300 provided in the above embodiments of the present invention. When the annular secondary airbag 120 is made of polyvinyl chloride (PVC) or high-density polyethylene (HDPE), its surface layer is a rough surface. The raft opening 800 formed by the annular secondary airbag 120 after pouring concrete to form a foundation raft 440 with a notch has an annular groove with a rough surface, which can improve the bonding performance at the junction of the later backfill concrete 450 and the foundation raft 440 constructed by concrete pouring before and after. Similarly, when the annular main airbag 110 is made of polyvinyl chloride (PVC) or high-density polyethylene (HDPE), the inner surface of the formed raft opening 800 is also a rough surface, which can improve the bonding performance of the subsequent backfill concrete 450.

[0095] The present invention is not limited to the above specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention fall within the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. Thus, if these modifications and changes of the present invention are within the scope of the claims of the present invention, the present invention also intends to include these modifications and changes.

Claims

1. A construction method for the foundation at the precipitation well node, characterized in that, it includes: Construct a foundation cushion at the precipitation well node, and embed a metal collar on the foundation cushion around the precipitation well; After inflating the airbag-type precipitation well casing by opening the air inlet valve and closing the exhaust valve, close the air inlet valve and set the airbag-type precipitation well casing on the metal collar around the precipitation well. The airbag-type precipitation well casing includes: A circular main airbag, which is an inverted frustum-shaped circular body; Multiple circular auxiliary airbags, which are connected to the circular main airbag and are arranged at equal intervals around the periphery of the circular main airbag; Pulling rings, which are arranged on the inner wall of the circular main airbag; An air inlet valve, which is arranged on the circular main airbag; An exhaust valve, which is arranged on the circular main airbag; A circular groove, which is arranged around the periphery of the lower end of the circular main airbag; Construct a waterproof layer on the foundation cushion at the precipitation well node, and the waterproof layer extends to the periphery of the airbag-type precipitation well casing to the circular groove thereon; Construct a protective layer on the waterproof layer; construct a foundation raft on the protective layer. Before constructing the foundation raft on the protective layer, set a metal hoop in the circular groove of the airbag-type precipitation well casing; Exhaust the airbag-type precipitation well casing at the precipitation well node by opening the exhaust valve; Remove and recycle the exhausted airbag-type precipitation well casing from the foundation raft at the precipitation well node through the pulling ring; Fill the precipitation well; Cover the opening of the precipitation well and weld a sealing steel plate on the metal collar; Pour concrete with a strength grade one level higher in the raft opening formed on the foundation raft after removing the airbag-type precipitation well casing to backfill the raft opening with concrete to form a complete foundation raft.

2. The construction method for the foundation at the precipitation well node according to claim 1, characterized in that, The cross-sectional shape of the circular auxiliary airbag is trapezoidal serrated.

3. The construction method for the foundation at the precipitation well node according to claim 1, characterized in that, The pulling rings are multiple and symmetrically arranged on the inner wall of the circular main airbag.

4. The construction method for the foundation at the precipitation well node according to claim 1, characterized in that, The pulling rings are arranged on the inner wall of the circular main airbag corresponding to the position of the circular auxiliary airbag.

5. The construction method for the foundation at the precipitation well node according to claim 1, characterized in that, The air inlet valve and the exhaust valve are respectively arranged on the upper end surface of the circular main airbag.

6. The construction method for the foundation at the precipitation well node according to claim 1, characterized in that, Both the circular main airbag and the circular auxiliary airbag are inflatable and deflatable airbags made of polyvinyl chloride or high-density polyethylene materials.

Images