Locking steel pipe pile and water stopping method

Abstract

The mouth-locking steel pipe pile comprises a plurality of steel pipe pile bodies arranged on the periphery of an enclosing purlin in a surrounding mode, four pieces of first channel steel are symmetrically welded to the periphery of each steel pipe pile body, and openings of the first channel steel are arranged towards the two sides and used for being connected with inserting plates subsequently; a stiffening steel plate is connected between the first channel steel and the steel pipe pile body. The lock opening is used as a position with weak bending resistance, so that the bending resistance is enhanced. The space of the cavity is large, concrete pouring is economical, convenient, easy and feasible, and the cofferdam is good in water stopping effect.

Description

Technical Field

[0001] The invention relates to bridge construction, in particular to a locking steel pipe pile and a water stopping method. Background Art

[0002] In the field of underwater bridge foundation construction, it is usually adopted to insert and drive ordinary locking steel pipe piles to form a closed cofferdam, and a dry working construction environment is formed in the cofferdam to construct the lower foundation and structure of the bridge.

[0003] like Figure 5 As shown, ordinary lock mouth generally adopts CT type, one end is welded on the steel pipe to form a C mouth (female head), and the other end is welded on the steel pipe to form a T mouth (male head). Adjacent steel pipes are inserted and punched to form a lock mouth, and water-blocking sealing materials are filled in the lock mouth to form a water-tight water-stop cofferdam.

[0004] In the above-mentioned lock-mouth structure, the steel pipe bears the main task of resisting bending. Due to the small cross-section of the lock-mouth, the bending resistance drops sharply, the contribution to the force is small, and it is a weak point in the structure.

[0005] The CT type lock mouth has a small area, is inconvenient to operate, the filling and blocking materials are not easy to be dense, and the cofferdam is prone to water seepage.

[0006] The purlin in the cofferdam is in point contact with the steel pipe. The steel pipe is subjected to uneven force and its bending resistance cannot be fully exerted. The steel pipe is easily deformed under the water pressure from the outside, which causes the lock mouth to deform and further affects the watertight effect of the lock mouth. Summary of the invention

[0007] The present invention aims to overcome the defects of the prior art and provide a locking steel pipe pile and a water stopping method to solve the problems of low bending stiffness at the locking point of ordinary locking steel pipe piles, poor water stopping effect and high precision requirement for the spacing between piles during injection.

[0008] In order to solve the above-mentioned technical problems, the present invention is achieved as follows: A locking steel pipe pile comprises a plurality of steel pipe pile bodies arranged around a surrounding purlin, characterized in that four first channel steels are symmetrically welded around each steel pipe pile body, the first channel steel openings are arranged on both sides for subsequent connection with plug plates; a stiffening steel plate is connected between the first channel steel and the steel pipe pile body.

[0009] The locking steel pipe pile is characterized in that it also includes a plurality of round steel bars, and the plurality of round steel bars are evenly distributed around the steel pipe pile body for subsequent connection with water-stop concrete.

[0010] The locking steel pipe pile is characterized in that it also includes a water-stopping sealing component, which includes two second channel steels, two steel plates and water-stopping concrete. The second channel steel is installed in the first channel steel on the main body of two adjacent steel pipe piles. The openings of the two second channel steels are arranged opposite to each other, and the steel plates are respectively connected between the upper and lower ends of the two second channel steels; the water-stopping concrete is filled between the two second channel steels, the two steel plates and the two adjacent steel pipe piles.

[0011] The locking steel pipe pile is characterized in that the two steel plates are welded and fixed to one of the second channel steels and are movably connected to the other second channel steel.

[0012] The locking steel pipe pile is characterized in that the first channel steel is 8# channel steel and the second channel steel is 5# channel steel.

[0013] The locking steel pipe pile is characterized in that the thickness of the reinforcing steel plate is 10 mm.

[0014] The water stopping method using the locking steel pipe pile is characterized in that it comprises the following steps: Step 1: Determine the model and specification of each steel pipe pile, plug plate and channel steel according to the actual cofferdam size and stress conditions on site, and calculate the spacing between two adjacent steel pipe piles; Step 2: Process the interlocking steel pipe piles in the factory or on site, and weld the channel steel, stiffening plate and round steel bars on the steel pipe piles; Step 3: Process the locking plate in the factory or on site, weld the channel steel at one end of the plate to the steel plates on both sides, and do not weld the channel steel and steel plates at the other end; Step 4: Drive steel pipe piles on site, extend them as needed, and close them to form a cofferdam. During the driving process, use limit or guide devices to control the spacing of steel pipe piles as accurately as possible to keep them consistent and reduce errors to avoid large differences in the width of the subsequent plug-in plates; Step 5: Measure the width of the limit channel steel between two adjacent steel pipe piles on site, determine the width of the plug plate, and weld the channel steel at the movable end of the plug plate to form a whole with the steel plates on both sides; Step 6: Insert plates into the limit channel steels between the steel pipe piles to seal the inside and outside of the steel pipe piles; Step 7: flush the cavities between the steel pipe piles and the plug plates, and remove the underwater silt in the cavities to the required depth; Step 8: placing an underwater conduit in the cavity, and pouring underwater concrete in an underwater concrete pouring manner to fill the entire cavity; Step 9: Set up purlins in layers at the cofferdam as required and proceed to the next step of construction.

[0015] The beneficial effects of the present invention are as follows: It can be seen from the above technical solution that the present application provides a locking steel pipe pile and a water stopping method, the invention can be well implemented and operated, the precision requirement for the steel pipe pile is relatively low, and the operation is convenient. The width of the subsequent plug plate is made according to the actual situation, with strong adaptability, convenience and feasibility.

[0016] Since the cavity is filled with underwater concrete, the lock mouth, which is a weak point in bending resistance, is strengthened. The cavity has a large space, pouring concrete is economical, easy and feasible, and the cofferdam has a good water-stopping effect.

[0017] The subsequent cofferdam horizontal purlins are in overall surface contact with the steel pipe piles, with a large stress surface, good bending resistance, and the steel pipe is not easy to deform. The cofferdam has good safety and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments: Figure 1 It is the plan view of the cofferdam structure; Figure 2 This is the detail drawing of the locking of steel pipe pile; Figure 3 This is a schematic diagram of a locked steel pipe pile; Figure 4 This is a schematic diagram of the plugboard.

[0019] Figure 5 It is a schematic diagram of the prior art. DETAILED DESCRIPTION

[0020] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection requested by the present application. like Figure 1-4 As shown: a locking steel pipe pile, including a plurality of steel pipe pile bodies 1 arranged around a surrounding purlin 2, four first channel steels 3 are symmetrically welded around each steel pipe pile body, and the first channel steel openings are arranged on both sides for subsequent connection of plug plates; a stiffening steel plate 4 is connected between the first channel steel and the steel pipe pile body.

[0021] It also includes a plurality of round steel bars 7, which are evenly distributed around the steel pipe pile body for subsequent connection with water-stop concrete.

[0022] It also includes a water-stop sealing component, which includes two second channel steels 5, two steel plates 6 and water-stop concrete 8. The second channel steel is installed in the first channel steel on the two adjacent steel pipe pile bodies. The two second channel steel openings are arranged opposite to each other, and the steel plates are respectively connected between the upper and lower ends of the two second channel steels; the water-stop concrete is filled between the two second channel steels, the two steel plates and the two adjacent steel pipe piles.

[0023] The two steel plates are welded and fixed to one of the second channel steels, and are movably connected to the other second channel steel.

[0024] The first channel steel is 8# channel steel, the second channel steel is 5# channel steel; the thickness of the stiffening steel plate is 10 mm.

[0025] The water stopping method using the locking steel pipe pile includes the following steps: Step 1: Determine the model and specification of each steel pipe pile, plug plate and channel steel according to the actual cofferdam size and stress conditions on site, and calculate the spacing between two adjacent steel pipe piles; Step 2: Process the interlocking steel pipe piles in the factory or on site, and weld the channel steel, stiffener plate and round steel bar on the steel pipe piles; Step 3: Process the locking plate in the factory or on site, weld the channel steel at one end of the plate to the steel plates on both sides, and do not weld the channel steel and steel plates at the other end; Step 4: Drive steel pipe piles on site, extend them as needed, and close them to form a cofferdam. During the driving process, use limit or guide devices to control the spacing of steel pipe piles as accurately as possible to keep them consistent and reduce errors to avoid large differences in the width of the subsequent plug-in plates; Step 5: Measure the width of the limit channel steel between two adjacent steel pipe piles on site, determine the width of the plug plate, and weld the channel steel at the movable end of the plug plate to form a whole with the steel plates on both sides; Step 6: Insert plates into the limit channel steels between the steel pipe piles to seal the inside and outside of the steel pipe piles; Step 7: flush the cavities between the steel pipe piles and the plug plates, and remove the underwater silt in the cavities to the required depth; Step 8: placing an underwater conduit in the cavity, and pouring underwater concrete in an underwater concrete pouring manner to fill the entire cavity; Step 9: Set up purlins in layers at the cofferdam as required and proceed to the next step of construction.

[0026] The locking of the steel pipe pile adopts symmetrical welding of four first channel steels 3 around the steel pipe pile 1, and the 8# channel steel adopts =10mm stiffening steel plate 4 to connect with the steel pipe for shaping and stiffening. This 8# channel steel is used as a limiting device for the subsequent plug-in plate.

[0027] A plurality of round steel bars 7 are welded around the steel pipe pile to serve as scissor keys, so as to strengthen the connection with the subsequent water-stopping concrete, bear the force together, and serve as a water-stopping auxiliary unit for extending the hydraulic path.

[0028] The plug plate serves as a water-stopping closing unit, which is welded by two second channel steels 5 and two steel plates 6 on both sides. The two steel plates are welded and fixed to one of the channel steels, and are not welded to the other channel steel for the time being, so that the channel steel at the other end can move freely and the spacing can be adjusted to adapt to the different variable widths formed between adjacent steel pipe piles due to poor injection accuracy.

[0029] The underwater concrete 8 adopts ordinary underwater concrete as a filling unit to fill the gaps between the steel pipes and the plug plates, increase the overall rigidity of the locking mouth of the steel pipe pile, and serve as a main water-stopping unit to isolate the water seepage paths inside and outside the cofferdam.

[0030] The above are only embodiments provided for the present application and are not intended to limit the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A locking steel pipe pile, comprising a plurality of steel pipe pile bodies arranged around a purlin, characterized in that: Four first channel steels are symmetrically welded around each steel pipe pile body, and the first channel steel openings are arranged on both sides for subsequent connection of plug plates; a reinforcing steel plate is connected between the first channel steel and the steel pipe pile body.

2. The locking steel pipe pile according to claim 1, characterized in that: It also includes a plurality of round steel bars, which are evenly distributed around the steel pipe pile body for subsequent connection with water-stop concrete.

3. The locking steel pipe pile according to claim 1, characterized in that: It also includes a water-stop sealing component, which includes two second channel steels, two steel plates and water-stop concrete. The second channel steel is installed in the first channel steel on the main body of two adjacent steel pipe piles. The openings of the two second channel steels are arranged opposite to each other, and the steel plates are respectively connected between the upper and lower ends of the two second channel steels; the water-stop concrete is filled between the two second channel steels, the two steel plates and the two adjacent steel pipe piles.

4. The locking steel pipe pile according to claim 3, characterized in that: The two steel plates are welded and fixed to one of the second channel steels, and are movably connected to the other second channel steel.

5. The interlocking steel pipe pile according to claim 3, characterized in that: The first channel steel is 8# channel steel, and the second channel steel is 5# channel steel.

6. The locking steel pipe pile according to claim 1, characterized in that: The thickness of the stiffening steel plate is 10 mm.

7. The water stopping method using the interlocking steel pipe pile according to claim 3, characterized in that It includes the following steps: Step 1: Determine the model and specification of each steel pipe pile, plug plate and channel steel according to the actual cofferdam size and stress conditions on site, and calculate the spacing between two adjacent steel pipe piles; Step 2: Process the interlocking steel pipe piles in the factory or on site, and weld the channel steel, stiffener plate and round steel bar on the steel pipe piles; Step 3: Process the locking plate in the factory or on site, weld the channel steel at one end of the plate to the steel plates on both sides, and do not weld the channel steel and steel plates at the other end; Step 4: Drive steel pipe piles on site, extend them as needed, and close them to form a cofferdam. During the driving process, use limit or guide devices to control the spacing of steel pipe piles as accurately as possible to keep them consistent and reduce errors to avoid large differences in the width of the subsequent plug-in plates; Step 5: Measure the width of the limit channel steel between two adjacent steel pipe piles on site, determine the width of the plug plate, and weld the channel steel at the movable end of the plug plate to form a whole with the steel plates on both sides; Step 6: Insert plates into the limit channel steels between the steel pipe piles to seal the inside and outside of the steel pipe piles; Step 7: flush the cavities between the steel pipe piles and the plug plates, and remove the underwater silt in the cavities to the required depth; Step 8: placing an underwater conduit in the cavity, and pouring underwater concrete in an underwater concrete pouring manner to fill the entire cavity; Step 9: Set up purlins in layers at the cofferdam as required and proceed to the next step of construction.

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