Support conversion construction method for drainage pipes in ultra-thick raft slabs

Abstract

The present invention discloses a support conversion construction method for drainage pipes in ultra-thick raft slabs, comprising the following steps: S1. constructing all required drainage wells, setting up temporary steel pipe supports on the tops of cast-in-place piles, and setting up drainage pipes; S2. after the drainage pipes are set up, using the drainage wells for pumping water, and excavating the soil between the raft piles; S3. after the soil excavation between the piles is completed, converting the temporary steel pipe supports into drainage well channel steel supports, and setting up the drainage well channel steel supports; S4. after the drainage well channel steel supports are set up, tying the bottom and top steel bars of the raft slab; S5. after the raft slab steel bars are tied, cutting the upper portion of the drainage well channel steel supports, and after the upper portion of the drainage well channel steel supports are cut, pouring large-volume concrete for the raft slab. The construction method of the present invention can effectively solve the construction problem of the ultra-thick raft slab steel bars intersecting with the drainage pipes during the tying work, and effectively improve the accuracy of the steel bar laying and tying.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a support conversion construction method for a drainage pipe of a precipitation well in an ultra-thick raft slab. Background Art

[0002] With the rapid development of high-rise buildings, piled raft foundations are increasingly being used for super-high-rise buildings, and the depth of raft slabs is also increasing. This inevitably leads to the problem of drainage. For non-enclosed drainage methods, if there are a large number of pipe wells, laying drainage pipes directly on the ground without using drainage well supports not only increases construction safety risks but also reduces operating space, affecting the normal construction process of the raft slab. If steel pipes or other similar materials are used for construction, this will significantly affect the layout of the raft slab reinforcement, reduce the bond strength between the raft slab and the concrete, reduce the quality of the raft slab concrete pour, and increase the project cost and construction period. Summary of the Invention

[0003] The object of the present invention is to provide a support conversion construction method for a drainage pipe in a precipitation well in an ultra-thick raft slab, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides a support conversion construction method for a drainage pipe in a precipitation well in an ultra-thick raft, comprising the following steps:

[0005] S1. Build all required drainage wells, erect temporary steel pipe supports on the cast-in-place pile heads, and install drainage pipes;

[0006] S2. After the drainage pipes are installed, water is pumped out using the drainage wells and soil excavation is carried out between the raft piles.

[0007] S3. After the soil excavation between the piles is completed, the temporary steel pipe support is converted into a steel support for the dewatering well trough and the steel support for the dewatering well trough is erected;

[0008] S4. After the steel support for the dewatering well is erected, tie the bottom and top raft reinforcement.

[0009] S5. After the raft reinforcement is tied, cut the upper portion of the steel bracket for lowering the well channel, and pour the raft mass concrete after the upper portion of the steel bracket for lowering the well channel is cut;

[0010] Among them, there are multiple groups of precipitation well channel steel supports, and the multiple groups of precipitation well channel steel supports are evenly arranged in multiple rows and columns. The precipitation well channel steel supports include channel steel base, channel steel columns, horizontal connecting rods, transverse channel steel supports and top supporting steel bars. The bottom of the channel steel column is fixedly connected to the channel steel base, the top of the channel steel column is fixedly connected to the transverse channel steel support, and top supporting steel bars are fixedly arranged on both sides of the top of the transverse channel steel support, and multiple precipitation well channel steel supports in the same column are fixedly connected by horizontal connecting rods.

[0011] In a preferred embodiment, in step S3, after the soil between the piles is excavated, the temporary steel pipe support 2 is converted into a dewatering well channel steel support, and the erection of the dewatering well channel steel support includes the following steps:

[0012] S31. Measure and lay out to determine the location of the channel steel base, embed the channel steel base, and tie the support foundation reinforcement.

[0013] S32. Weld the channel steel column on the channel steel base and support the template on the outside of the channel steel column;

[0014] S33. Pour foundation concrete within the formwork. After the concrete solidifies, use cement mortar to grade the slope around the perimeter. Waterproof the raft slab cushion. Finally, apply sealant to the bottom of the channel steel columns to seal any gaps.

[0015] S34. Weld the transverse channel steel support to the channel steel column and weld the top support steel bars on both sides of the transverse channel steel support;

[0016] S35 is located in the same column of multiple precipitation well channel steel bracket fixedly connected by a horizontal connecting rod, using channel steel as a horizontal connecting rod through the length of the welded;

[0017] S36. Install drainage pipes on top of the drainage well steel support;

[0018] S37. Set the steel support of the drainage well channel between the bottom steel bars and the top steel bars of the raft slab.

[0019] In a preferred embodiment, in step S33, waterproofing treatment is performed on the raft cushion layer, including: applying cold primer on the raft cushion layer, setting waterproof membrane, applying non-shrinkage grouting material on the top of the foundation concrete, and then constructing the raft foundation waterproof protective layer.

[0020] In a preferred embodiment, step S3 further includes laying wooden gangways on the bottom and both sides of the drainage pipe on top of the drainage well channel steel support.

[0021] In a preferred embodiment, the channel steel base, channel steel columns, horizontal connecting rods, and transverse channel steel supports are all made of channel steel No. 6.5, the transverse channel steel supports are fully welded to the channel steel columns and horizontal connecting rods, and the top support steel bars are fully welded to the transverse channel steel supports.

[0022] In a preferred embodiment, the width of the channel steel column is smaller than the spacing of the steel bars in the bottom layer of the raft slab.

[0023] In a preferred embodiment, the thickness of the super-thick raft slab is 4m, the bottom layer of the raft slab steel bars adopt 18m-24m fixed-length steel bars, the bottom layer of the raft slab steel bars are laid in a maximum of 28 layers, the diameter of the cast-in-place pile is 1.2m, and the top of the cast-in-place pile is extended with 1.6m of pile head steel bars, and the bottom layer of the raft slab steel bars are interspersed with the channel steel columns and the pile head steel bars for binding.

[0024] In a preferred embodiment, the bottom reinforcement of the raft slab is sealed with L-shaped reinforcement, the edge sealing height is 4m, the top reinforcement of the raft slab is sealed with L-shaped reinforcement, and the top reinforcement of the raft slab is supported by stirrups.

[0025] In a preferred embodiment, the wooden springboard is fixedly connected to the top supporting steel bars by tying wires, and the size of the wooden springboard is not less than 50 mm in thickness.

[0026] In a preferred embodiment, the top support steel bars are steel bars with a diameter of not less than 16 mm, and the support base steel bars are steel bars with a diameter of not less than 8 mm.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: the construction method of the present invention can effectively solve the construction problem of the super-thick raft slab steel bars crisscrossing with the downdraft pipes during the binding work, effectively improve the accuracy of the steel bar layout and binding, and ensure the safety and stability of a large number of drainage pipes. The downdraft well channel steel bracket of the present invention is simple to construct, the channel steel material can be processed and formed in one time, and the embedded parts can be fixed and installed after entering the site, and the downdraft well channel steel bracket adopts a single vertical pole for support, which can avoid the influence of complex pile head steel bars on the bracket. In the case of a large number of super-thick raft slab steel bars and dense arrangement, the width of the single vertical pole is less than the steel bar spacing, which does not affect the normal binding of the foundation bottom plate steel bars. At the same time, the top of the bracket will be placed between the bottom and top steel bars to avoid affecting the steel bar arrangement, saving construction time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a front view of the steel support for the drainage well channel of the present invention;

[0029] Figure 2 This is a side view of the steel support for the drainage well channel of the present invention;

[0030] Figure 3 This is a cross-sectional view of the foundation of the steel support for the drainage well channel of the present invention (top view);

[0031] Figure 4 This is a front view of the steel support for the drainage well and the raft reinforcement binding of the present invention;

[0032] Figure 5 This is a front view of the cut-out precipitation well support and raft casting of the present invention;

[0033] Figure 6 This is a front view of a temporary support for a steel pipe at a pile head of a dewatering well according to the present invention;

[0034] Figure 7 It is a top view of the temporary support for the steel pipe of the precipitation well pile head of the present invention.

[0035] Description of reference numerals:

[0036] 1- cast-in-place piles, 2- temporary steel pipe support, 3- dewatering well channel steel support, 4- bottom raft slab steel bars, 5- top raft slab steel bars, 6- formwork, 7- raft slab concrete, 8- dewatering pipes, 101- channel steel base, 102- channel steel columns, 103- horizontal connecting rods, 104- transverse channel steel supports, 105- top supporting steel bars, 201- support foundation steel bars, 202- foundation concrete, 203- cement mortar, 301- raft slab foundation cushion, 302- cold primer, 303- waterproof membrane, 304- waterproof protective layer, 305- non-shrinkage grouting material, 306- sealant, 307- concrete protective layer, 308- wooden springboard, 309- binding wire, 10- soil excavation between piles. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. The embodiments of the present invention and all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] like Figure 1-5 As shown, this embodiment provides a precipitation well channel steel bracket 3 for the precipitation well drainage pipe in the super-thick raft slab. The precipitation well channel steel bracket 3 is provided with multiple groups, and the multiple groups of precipitation well channel steel brackets 3 are evenly arranged in multiple rows and columns. The precipitation well channel steel bracket 3 includes a channel steel base 101, a channel steel column 102, a horizontal connecting rod 103, a transverse channel steel support 104 and a top supporting steel bar 105. The bottom of the channel steel column 102 is fixedly connected to the channel steel base 101, and the top of the channel steel column 102 is fixedly connected to the transverse channel steel support 104. Top supporting steel bars 105 are fixedly provided on both sides of the top of the transverse channel steel support 104, and multiple precipitation well channel steel brackets 3 located in the same column are fixedly connected by the horizontal connecting rod 103.

[0040] Furthermore, the channel steel base 101, channel steel columns 102, horizontal connecting rods 103, and transverse channel steel supports 104 are all made of channel steel of no less than No. 6.5, preferably No. 12. The transverse channel steel supports 104 are fully welded to the channel steel columns 102 and horizontal connecting rods 103, and the top support bars 105 are fully welded to the transverse channel steel supports 104.

[0041] Furthermore, after the soil between the piles is excavated, the temporary steel pipe support is replaced with the dewatering well channel steel support 3, and the dewatering well channel steel support 3 is set between the bottom steel bar 4 of the raft slab and the top steel bar 5 of the raft slab, which has no effect on the pouring of the raft slab concrete 7. The width of the channel steel column 102 is smaller than the spacing of the bottom steel bar 4 of the raft slab. Since the dewatering well channel steel support 3 adopts a single-pole support structure, the influence of the complex pile head steel bars on the support can be avoided. In the case of ultra-thick raft slabs with a large number of steel bar layers and dense arrangement, the setting of the channel steel column 102 does not affect the normal binding of the bottom steel bar of the raft slab. At the same time, the top of the support will be placed between the bottom steel bar 4 of the raft slab and the top steel bar 5 of the raft slab to avoid affecting the arrangement of the steel bars.

[0042] Example 2

[0043] like Figure 1-7 As shown, the support conversion construction method for the drainage pipe of the precipitation well in the ultra-thick raft of the present invention includes the following steps:

[0044] S1. All required construction of precipitation wells, and set up a temporary steel support 2 on the pile head of the cast-in-place pile 1, and set up the drainage pipe;

[0045] S2. After the drainage pipes are installed, water is pumped out using the drainage wells and soil excavation is carried out between the raft piles.

[0046] S3 after the soil excavation between the piles is completed, the temporary steel support 2 is converted into precipitation well trough steel support 3, and the precipitation well trough steel support 3 is erected;

[0047] S4 After the precipitation well trough steel support 3 is completed, the bottom raft steel bars 4 and the top raft steel bars 5 are tied;

[0048] S5. After the raft reinforcement is tied, the upper portion of the dewatering well channel steel bracket 3 is cut. After the upper portion of the dewatering well channel steel bracket 3 is cut, the raft slab mass concrete is poured.

[0049] Furthermore, in step S3, after the soil between the piles is excavated, the temporary steel pipe support 2 is converted into a dewatering well channel steel support 3, and the erection of the dewatering well channel steel support includes the following steps:

[0050] S31 measuring and laying out to determine the location of the channel steel base 101, embedded channel steel base 101 and the bracket foundation steel tying 201;

[0051] S32. The channel steel column 102 is welded on the channel steel base 101, and the channel steel column 102 is centered on its outer side supporting template 6;

[0052] S33 pouring concrete foundation 202 in the template 6, after the concrete solidifies, use cement mortar 203 along the slope around and waterproofing the raft pad 301 above, and finally apply sealant 306 to the bottom of the channel column 102 to seal the pores;

[0053] S34. The transverse channel support 104 is welded to the channel column 102, and the top support steel bars 105 are welded on both sides of the transverse channel support 104;

[0054] S35 is located in the same column of multiple precipitation well channel steel bracket 3 is fixedly connected by a horizontal connecting rod 103, using channel steel as a horizontal connecting rod 103 through the length of the weld;

[0055] S36. Install the drainage pipe 8 on top of the steel support 3 for the dewatering well;

[0056] S37. Set the dewatering well steel support 3 between the bottom steel bar 4 and the top steel bar 5 of the raft slab.

[0057] Furthermore, in step S33, waterproofing is performed on the raft slab cushion layer 301, including applying a cold primer 302 on the raft slab cushion layer 301, installing a waterproofing membrane 303, applying a non-shrinkage grouting material 305 on top of the foundation concrete 202, and then constructing a raft foundation waterproofing protective layer 304. The raft slab cushion layer 301 and the waterproofing membrane 303 need to be rounded to facilitate a tight connection between the non-shrinkage grouting material 305 on top of the precipitation well steel support foundation and the raft foundation waterproofing protective layer 304.

[0058] Furthermore, step S3 also includes laying wooden gangways 308 on the bottom and both sides of the drainage pipe on top of the drainage well steel support 3.

[0059] Furthermore, in this embodiment, the ultra-thick raft slab is 4m thick. The bottom raft reinforcement 4 utilizes 18m-24m fixed-length steel bars, allowing for up to 28 layers of raft reinforcement. The diameter of the cast-in-place piles 1 is 1.2m, with 1.6m of pile head reinforcement extending from the top. The bottom raft reinforcement 4 is interlaced between the channel steel columns 102 and the pile head reinforcement for binding. The bottom raft reinforcement is edge-sealed with L-shaped steel bars, with a height of 4m. The use of single-pole channel steel supports eliminates the need for airtight space between the channel steel supports and the cast-in-place pile reinforcement, ensuring that the bottom raft reinforcement can be interlaced between the channel steel columns and the pile head reinforcement for binding. The top raft reinforcement 5 is supported by stirrups (not shown). The top raft reinforcement 5 is edge-sealed with L-shaped steel bars, with a height of 550mm on the outer ring and 5770mm on the inner ring at the intersection of the high and low spans.

[0060] Furthermore, the wooden springboard 308 is fixedly connected to the top supporting steel bar 105 by means of binding wires 309, and the size of the wooden springboard 308 is not less than 50 mm in thickness.

[0061] Furthermore, the top support steel bars 105 are steel bars with a diameter of not less than 16 mm, and the support base steel bars 201 are steel bars with a diameter of not less than 8 mm.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for replacing a support structure for a drainage pipe in a super-thick raft, characterized by: The steps include: S1. All required drainage wells shall be constructed, and temporary steel pipe supports (2) shall be erected on the top of the cast-in-place piles (1), and drainage pipes shall be installed; S2 after the drainage pipe is erected, the use of the precipitation wells for pumping operations, and soil excavation work between the raft piles; S3. After the soil excavation between the piles is completed, the temporary steel pipe support (2) is converted into a precipitation well trough steel support (3), and the precipitation well trough steel support (3) is erected; S4 After the dewatering well steel support (3) is erected, the bottom raft steel bar (4) and the top raft steel bar (5) are tied; S5. After the raft reinforcement is tied, the upper portion of the steel bracket (3) is cut to reduce the water flow, and the upper portion of the steel bracket (3) is cut to reduce the water flow, and the raft concrete (7) is poured. The dewatering well channel steel bracket (3) is provided with multiple groups, and the multiple groups of the dewatering well channel steel bracket (3) are evenly arranged in multiple rows and columns. The dewatering well channel steel bracket (3) comprises a channel steel base (101), a channel steel column (102), a horizontal connecting rod (103), a transverse channel steel support (104) and a top supporting steel bar (105). The bottom of the channel steel column (102) is fixedly connected to the channel steel base (101), the top of the channel steel column (102) is fixedly connected to the transverse channel steel support (104), and top supporting steel bars (105) are fixedly provided on both sides of the top of the transverse channel steel support (104), and multiple dewatering well channel steel brackets (3) located in the same column are fixedly connected by the horizontal connecting rod (103); In step S3, after the soil between the piles is excavated, the temporary steel pipe support (2) is converted into a dewatering well channel steel support (3), and the erection of the dewatering well channel steel support includes the following steps: S31. Measure and lay out to determine the location of the channel steel base (101), embed the channel steel base (101) and tie the support base steel bars (201); S32. Weld the channel steel column (102) on the channel steel base (101), and support the template (6) on the outer side of the channel steel column (102) as the center; S33. Pour foundation concrete (202) into the formwork (6). After the concrete solidifies, use cement mortar (203) to slope around the perimeter. Perform waterproofing on the raft pad (301). Finally, apply sealant (306) to the bottom of the channel steel column (102) to seal the pores. S34. Welding the transverse channel steel support (104) to the channel steel column (102), and welding the top support steel bars (105) on both sides of the transverse channel steel support (104); S35. The plurality of the precipitation well channel steel brackets (3) located in the same column are fixedly connected by a horizontal connecting rod (103), and the channel steel is used as the horizontal connecting rod (103) and welded throughout the length; S36. Install the drainage pipe on top of the steel support (3) of the drainage well; S37. The dewatering well steel support (3) is arranged between the bottom steel bar (4) and the top steel bar (5) of the raft slab.

2. The support conversion construction method for drainage pipes in ultra-thick raft slabs according to claim 1 is characterized in that: In step S33, waterproofing treatment is performed on the raft cushion layer (301), including: applying cold primer (302) on the raft cushion layer (301), arranging waterproofing coiled material (303), applying non-shrinkage grouting material (305) on the top of the foundation concrete (202), and then constructing the raft foundation waterproofing protective layer (304).

3. The support conversion construction method for drainage pipes in ultra-thick raft slabs according to claim 2 is characterized in that: Step S3 also includes laying wooden gangplanks (308) on the bottom and both sides of the drainage pipe on top of the drainage well steel support (3).

4. The support conversion construction method for drainage pipes in ultra-thick raft slabs according to claim 3 is characterized in that: The channel steel base (101), the channel steel column (102), the horizontal connecting rod (103), and the transverse channel steel support (104) are all made of channel steel of not less than No. 6.

5. The transverse channel steel support (104) and the channel steel column (102) and the horizontal connecting rod (103) are all fully welded, and the top support steel bar (105) and the transverse channel steel support (104) are fully welded.

5. The support conversion construction method for drainage pipes in ultra-thick raft slabs according to claim 3 is characterized in that: The width of the channel steel column (102) is smaller than the spacing of the steel bars (4) in the bottom layer of the raft slab.

6. The support conversion construction method for drainage pipes in ultra-thick raft slabs according to claim 5 is characterized in that: The thickness of the super-thick raft slab is 4m. The bottom steel bars (4) of the raft slab are 18m-24m fixed-length steel bars. The bottom steel bars (4) of the raft slab are laid in 28 layers at most. The diameter of the cast-in-place pile (1) is 1.2m. The top of the cast-in-place pile is 1.6m long. The bottom steel bars (4) of the raft slab are inserted into the channel steel column (102) and the pile head steel bars for binding.

7. The support conversion construction method for drainage pipes in ultra-thick raft slabs according to claim 6 is characterized in that: The bottom layer of the raft slab steel bars (4) are edge-sealed with L-shaped steel bars, with an edge-sealing height of 4m; the top layer of the raft slab steel bars (5) are edge-sealed with L-shaped steel bars, and the top layer of the raft slab steel bars (5) are supported by stirrups.

8. The support conversion construction method for drainage pipes in ultra-thick raft slabs according to claim 5 is characterized in that: The wooden springboard (308) is fixedly connected to the top supporting steel bar (105) by means of a tying wire (309), and the wooden springboard (308) is not less than 50 mm thick.

9. The support conversion construction method for drainage pipes in ultra-thick raft slabs according to claim 3 is characterized in that: The top support steel bars (105) are steel bars with a diameter of not less than 16 mm, and the support base steel bars (201) are steel bars with a diameter of not less than 8 mm.

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