Impact holing permanent steel casing cast-in-place pile penetrating through high-flow-rate drainage pipe culvert and construction method

Abstract

According to the impact holing permanent steel casing cast-in-place pile penetrating through the high-flow-speed drainage pipe culvert and the construction method, the double-layer steel casing nesting and sinking technology is provided aiming at the influence of rapid flow in the drainage pipe culvert, and an outer casing is hoisted to a guide frame and immersed to the bottom of the pipe culvert to provide a still water condition for construction of an inner casing; meanwhile, a reinforcing area is formed through inflation expansion or grouting of an air bag on the annular side of the inner pile casing to isolate direct scouring of torrent to the inner pile casing; the mud cake scraping device is tightly sleeved on the periphery of the drill rod, the drill rod rotates at high speed to drive the mud cake scraping device to cut mud cakes, and the problem of cleaning mud cakes around a pile is solved. The method has the advantages of being high in construction precision, good in waterproof effect, good in hole cleaning effect and the like, the influence of torrent on pile foundation construction and durability is avoided, and good technical and economic benefits can be obtained when the method is applied to actual engineering.

Description

Technical Field

[0001] The invention relates to the field of cast-in-place piles, in particular to permanent steel casing cast-in-place piles that penetrate a high-flow-rate drainage culvert and impact-form holes, and a construction method. Background Art

[0002] For the pile foundation construction that crosses the drainage culvert, the water flow in the culvert is fast and the scouring force is strong, which has a great impact on the pile foundation construction and anti-erosion. In particular, how to solve the problem of sinking the pile foundation casing under the rapids and avoid the rapids from scouring the pile foundation is a key consideration. Therefore, for the pile foundation construction that crosses the drainage culvert, it is urgent to seek efficient construction methods to solve the existing construction problems.

[0003] In summary, in order to solve the construction difficulties of pile foundations for drainage culverts crossing high-velocity flow lines, it is urgent to propose a construction method for permanent steel casing cast-in-place piles that are impact-bored through high-velocity drainage culverts. Summary of the invention

[0004] The purpose of the present invention is to provide a permanent steel casing cast-in-place pile for impact-forming through a high-flow-rate drainage culvert and a construction method thereof to solve the above-mentioned technical problems.

[0005] In order to solve the above technical problems, the present invention provides a construction method for permanent steel casing cast-in-place piles that penetrate a high-flow drainage culvert through impact drilling, comprising the following steps:

[0006] Step 1: Set up a steel pipe pile support system, lay a construction platform on the support system formed by a number of steel pipe piles and fix the guide frame;

[0007] Step 2: hoist the outer casing into the guide frame, sink it to the top of the drainage culvert and temporarily fix it;

[0008] Step 3: The impact drill punches holes downward along the outer casing and breaks through the top of the drainage culvert, and throws gravel bags into the outer casing to block the downstream of the drainage culvert;

[0009] Step 4: Continue to lower the outer casing to the bottom of the inner side of the drainage culvert to create static water conditions;

[0010] Step 5: hoist the inner casing with the air bag or grouting pipe to the guide frame, punch the hole downward with the impact drill, and the inner casing is simultaneously followed to the designed depth;

[0011] Step 6: The drill rod at the bottom of the impact drill rotates to drive the nested scraper to rotate and cut the mud skin, and at the same time discharge the inner casing sediment into the mud pool;

[0012] Step 7: Remove the outer casing, and use the inner casing ring side airbag to inflate or ring side grouting to form a consolidation zone for external plugging;

[0013] Step 8: Hoist the steel cage to the guide frame and sink it;

[0014] Step 9: Install the concrete pouring support on the construction platform and pour the pile foundation.

[0015] The beneficial effects of the present invention are:

[0016] (1) A guide frame for the placement of steel casing and steel cage was developed. An adjustable jack with a limited position was set at the top of the guide frame, which can be adjusted according to the cross-sectional size, thereby increasing the applicability of the guide frame and improving the placement accuracy of the component.

[0017] (2) A double-layer steel casing nested sinking technology was proposed. The outer casing was sunk to the bottom of the culvert to create a static water condition, thus avoiding the scouring effect of the rapid current on the inner casing.

[0018] (3) A mud scraping device for impact drilling was developed. The mud scraping device is tightly mounted on the outer periphery of the drill rod of the impact drill. The high-speed rotation of the drill rod drives the tooth plate to cut the mud, thus solving the problem of cleaning the mud around the pile.

[0019] (4) An inner casing ring side airbag and grouting plugging technology was proposed. The outer periphery of the inner casing carries an airbag or a grouting tube and is lowered to the culvert area. The airbag is inflated or grouting is reinforced to isolate the water flow from erosion, thus avoiding the direct impact of rapids on the bearing capacity and durability of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the outer casing guide frame sinking;

[0021] Figure 2 It is the AA section view;

[0022] Figure 3 It is a schematic diagram of punching with an impact drill;

[0023] Figure 4 1. It is a schematic diagram of the structure of the mud scraping device;

[0024] Figure 5 This is a schematic diagram of the sealing of gravel bags;

[0025] Figure 6 This is a schematic diagram of the inner casing sinking;

[0026] Figure 7 This is a schematic diagram of the airbag plugging on the inner casing ring side;

[0027] Figure 8 This is a schematic diagram of the inner casing ring side grouting plugging;

[0028] Fig. 9 This is a schematic diagram of the sinking of the steel cage guide frame;

[0029] Fig.10It is a BB cross-section;

[0030] Fig.11 It is a schematic diagram of pile foundation pouring;

[0031] Fig.12 It is a CC cross-section diagram.

[0032] In the figure: 1-steel pipe pile; 2-construction platform; 3-guide frame; 4-outer casing; 5-adjustable jack; 6-drainage culvert; 7-impact drill bit; 8-drill rod; 9-impact drill rig; 10-mud scraper; 11-mud pool; 12-first ring body; 13-second ring body; 14-adjustable telescopic rod; 15-tooth plate; 16-gravel bag; 17-inner casing; 18-air bag; 19-air supply pipe; 20-connecting piece; 21-grouting pipe; 22-grouting port; 23-consolidation area; 24-rebar cage; 25-aggregate hopper; 26-casting bracket; 27-horizontal steel beam; 28-longitudinal steel beam; 29-horizontal support; 30-arc support. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0034] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0035] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0036] like Figure 1-Figure 12 The present invention provides a construction method for permanent steel casing cast-in-place piles that penetrate a high-velocity drainage culvert through impact drilling, comprising the following steps:

[0037] Step 1: Set up a support system of steel pipe piles 1, lay a construction platform 2 on the support system formed by a number of steel pipe piles 1 and fix a guide frame 3;

[0038] Step 2: hoist the outer casing 4 into the guide frame 3, sink it to the top of the drainage culvert 6 and temporarily fix it;

[0039] Specifically, adjustable jacks 5 are provided at the four corners of the guide frame 3 so that the ends of the adjustable jacks 5 are against the outer periphery of the outer casing 4 .

[0040] Step 3: The impact drill 9 punches holes downward along the outer casing 4 and breaks through the top of the drainage culvert 6, and throws gravel bags 16 into the outer casing 4 to block the downstream of the drainage culvert 6;

[0041] Step 4: The outer casing 4 continues to be sunk to the bottom of the inner side of the drainage culvert 6 to create a static water condition;

[0042] Step 5: Adjust the adjustable jack 5 to adapt to the size of the inner casing 17, hoist the inner casing 17 with the air bag 18 or the grouting pipe 21 to the guide frame 3, punch the hole downward with the impact drill 9, and the inner casing 17 is synchronously followed to the designed depth;

[0043] Specifically, the diameter of the inner casing 17 is smaller than the diameter of the outer casing 4 .

[0044] Step 6: The drill rod 8 at the bottom of the impact drill 9 rotates to drive the nested scraper 10 to rotate at high speed to cut the mud skin, and at the same time, the sediment of the inner casing 17 is discharged into the mud pool 11 by using the slurry replacement method;

[0045] Specifically, the mud scraper device 10 is located on the upper part of the impact drill bit 7 of the impact drill 9 and is tightly sleeved on the outer periphery of the drill rod 8; the mud scraper device 10 includes a first ring body 12, a second ring body 13, an adjustable telescopic rod 14 and a tooth plate 15; the first ring body 12 is tightly sleeved on the outside of the drill rod 8 and can rotate synchronously with the drill rod 8, the tooth plate 15 is connected to the end of the adjustable telescopic rod 14, and the adjustable telescopic rod 14 is passed through the second ring body 13.

[0046] The adjustable telescopic rod 14 may be a threaded telescopic rod, so as to adjust the length of the telescopic rod by rotation, thereby controlling the position of the toothed plate 15 .

[0047] Step 7: Remove the outer casing 4, and use the inner casing 17 to inflate the side airbag 18 or inject grout into the side to form a consolidation zone 23 for external plugging;

[0048] Specifically, when the annular side airbag 18 is used for plugging, an air supply pipe 19 is installed on the outside of the inner casing 17, the bottom of the air supply pipe 19 is connected to the airbag 18, and the air supply pipe 19 is fixed to the outer wall of the inner casing 17 through a connector 20; when the annular side grouting is used for plugging, a grouting pipe 21 is installed on the outside of the inner casing 17, and the grouting pipe 21 is fixed to the outer wall of the inner casing 17 through a connector 20; a plurality of grouting ports 22 are opened on the body of the grouting pipe 21.

[0049] Step 8: Adjust the adjustable jack 5 to adapt to the size of the steel cage 24, and hoist the steel cage 24 to the guide frame 3 and sink it;

[0050] Step nine: Install the concrete pouring support 26 on the construction platform 2 to perform pile foundation pouring.

[0051] Specifically, the top surface of the pouring support 26 is welded by a horizontal steel beam 27 and a longitudinal steel beam 28 , and an arc support 30 is symmetrically installed in the middle of the longitudinal steel beam 28 for limiting the collecting hopper 25 ; the arc support 30 is welded to the longitudinal steel beam 28 through a horizontal support 29 .

[0052] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A construction method for permanent steel casing cast-in-place piles through high-velocity drainage culverts, characterized in that: The following steps are involved: Step 1: Setting up a steel pipe pile (1) support system, laying a construction platform (2) on the support system formed by a plurality of steel pipe piles (1) and fixing a guide frame (3); Step 2: hoist the outer casing (4) into the guide frame (3), sink it to the top of the drainage culvert (6) and temporarily fix it; Step 3: The impact drill (9) punches holes downward along the outer casing (4) and breaks through the top of the drainage culvert (6), and throws gravel bags (16) into the outer casing (4) to block the downstream of the drainage culvert (6); Step 4: The outer casing (4) is further sunk to the bottom of the inner side of the drainage culvert (6) to create a static water condition; Step 5: hoist the inner casing (17) with the air bag (18) or the grouting pipe (21) to the guide frame (3), and punch the hole downward with the impact drill (9), and the inner casing (17) is synchronously followed to the designed depth; Step 6: The drill rod (8) at the bottom of the impact drill (9) rotates to drive the nested scraper device (10) to rotate and cut the mud skin, and at the same time, the sediment of the inner casing (17) is discharged into the mud pool (11); Step 7: Remove the outer casing (4), and use the inner casing (17) to inflate the side airbag (18) or perform side grouting to form a consolidation zone (23) for external plugging; Step 8: hoist the steel cage (24) to the guide frame (3) and sink it; Step nine: Install the concrete pouring support (26) on the construction platform (2) to perform pile foundation pouring.

2. The construction method of permanent steel casing cast-in-place piles for impact-forming holes through high-velocity drainage culverts according to claim 1 is characterized in that: In step 2, adjustable jacks (5) are arranged at the four corners of the guide frame (3) so that the ends of the adjustable jacks (5) are against the outer periphery of the outer casing (4).

3. The construction method of permanent steel casing cast-in-place piles for impact-forming holes through high-velocity drainage culverts according to claim 1 is characterized in that: In step 5, the diameter of the inner casing (17) is smaller than the diameter of the outer casing (4).

4. The construction method of permanent steel casing cast-in-place piles for impact-forming holes through high-velocity drainage culverts according to claim 1 is characterized in that: In step six, the scraper device (10) is located on the upper part of the impact drill bit (7) of the impact drill (9) and is tightly sleeved on the outer periphery of the drill rod (8); the scraper device (10) comprises a first ring body (12), a second ring body (13), an adjustable telescopic rod (14) and a tooth plate (15); the first ring body (12) is tightly sleeved on the outside of the drill rod (8) and can rotate synchronously with the drill rod (8); the tooth plate (15) is connected to the end of the adjustable telescopic rod (14), and the adjustable telescopic rod (14) passes through the second ring body (13).

5. The construction method of permanent steel casing cast-in-place piles for impact-forming holes through high-velocity drainage culverts according to claim 1 is characterized in that: In step seven, when the annular side air bag (18) is used for plugging, an air supply pipe (19) is installed outside the inner casing (17), the bottom of the air supply pipe (19) is connected to the air bag (18), and the air supply pipe (19) is fixed to the outer wall of the inner casing (17) through a connector (20); when the annular side grouting is used for plugging, a grouting pipe (21) is installed outside the inner casing (17), and the grouting pipe (21) is fixed to the outer wall of the inner casing (17) through a connector (20); and the body of the grouting pipe (21) is provided with a plurality of grouting ports (22).

6. The construction method of permanent steel casing cast-in-place piles through high-velocity drainage culverts by impact drilling according to claim 1 is characterized in that: In step nine, the top surface of the pouring support (26) is formed by splicing a horizontal steel beam (27) and a longitudinal steel beam (28), and an arc support (30) is symmetrically installed in the middle of the longitudinal steel beam (28) for limiting the position of the aggregate hopper (25); the arc support (30) is connected to the longitudinal steel beam (28) through a horizontal support (29).

7. A permanent steel casing cast-in-place pile for impact drilling through a high-velocity drainage culvert, characterized by: The method for constructing permanent steel casing cast-in-place piles by impact-forming holes through a high-velocity drainage culvert according to any one of claims 1 to 6 is used to obtain the piles.

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