Construction method for newly building pier on in-situ pier column in water

Abstract

The invention discloses a construction method for newly building a pier on an in-situ pier column in water. The technical problem that an existing construction method cannot be suitable for newly building the pier on the in-situ pier column in water is solved. According to the method, the hole is guided in the in-situ pier column in the water, and the hole guiding protection cylinder is arranged, so that compared with the method that the hole is directly drilled in the in-situ pier column in the water to construct the pile foundation hole, the hole guiding height is greatly reduced, and the construction difficulty of directly drilling in the in-situ pier column in the water is reduced; underwater concrete is poured in a gap between the bottom of the guide hole casing and the bottom of the pile foundation casing, a guide device is arranged at the top of the pile foundation casing, the two ends of the guide device are fixed to stably support the pile foundation casing, then downward impact hole forming is conducted along a center hole of the pile foundation casing, the size, the surface quality and the perpendicularity of the formed hole are guaranteed, and the quality of the formed hole of the pile foundation is guaranteed. The construction of the new bridge pier is completed on the basis of pile foundation hole forming, and the construction difficulty of the new bridge pier is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a construction method for building a new bridge pier on an in-situ pier column in water. Background Art

[0002] The Chinese invention patent with the application announcement date of 2021.02.26 and the application announcement number of CN 112411574 A discloses a construction method of using an impact drill in situ at the old bridge pile site in conjunction with a rotary drilling rig to form a hole, including the following steps: step one, leveling the site, step two, stakeout of the pile site, step three, burying the casing, step four, positioning the impact drill, step five, centering check, step six, mud preparation and circulation, step seven, impact drilling, step eight, lifting the drill with the impact drill, and step nine, secondary re-measurement of the casing. The above construction method uses an impact drill in conjunction with a rotary drilling rig to drill holes, uses the impact drill for the old pile foundation, and uses a rotary drilling rig to construct the part below the old pile foundation. The construction sequence is clear, safe and reliable. The unit price of the impact drill is much higher than the unit price of the rotary drilling rig. It saves construction costs while ensuring quality and safety, and the equipment cost is significantly saved, with high construction efficiency.

[0003] The above construction method is applicable to land construction. When drilling holes for in-situ piers in water, it is inconvenient to bury casings because the in-situ piers are located in navigable rivers and the underwater construction conditions are complex. In addition, the in-situ piers in the river are gravity-type solid strength and have a large original cross-section. When impact drilling is used on the in-situ piers, if the drilling quality is not well controlled, hole collapse, diameter reduction, pile hole deviation and the pile end failing to meet the design bearing layer requirements may occur, which will directly affect the quality of the pile body and cause a decrease in the pile bearing capacity. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a construction method for building new bridge piers on in-situ pier columns in water, which solves the technical problem that the existing construction method cannot be applied to building new bridge piers on in-situ pier columns in water.

[0005] The technical solution of this application is: A construction method for building a new bridge pier on an in-situ pier column in water, comprising the following steps: Step 1: Drilling: Use a drilling rig to drill a hole on the original pier column, aligning the center of the hole with the center of the pile position; Step 2: placing the lead hole casing: placing the lead hole casing in the borehole obtained in step 1, with the top of the lead hole casing being higher than the water surface; Step 3, placing the pile foundation casing: placing the pile foundation casing in the guide hole casing, with the center of the pile foundation casing aligned with the center of the pile position; Step 4: pour underwater concrete in the gap between the guide hole casing and the pile foundation casing, and set a guide device to firmly support the top of the pile foundation casing; Step 5: Construct impact piles on the basis of pile foundation casing.

[0006] Preferably, in step one, the drilling rig is arranged on a steel trestle platform.

[0007] Preferably, the drilling rig is a rotary drilling rig.

[0008] Preferably, in the step 2, the center of the borehole casing is aligned with the center of the drill hole.

[0009] Preferably, the guide hole casing is loosely matched with the drill hole.

[0010] Preferably, the top of the pile foundation casing in step three is higher than the height of the steel trestle platform.

[0011] Preferably, the top of the pile foundation casing is 30 cm higher than the height of the steel trestle platform.

[0012] Preferably, the guiding device in step four is arranged on the steel trestle platform.

[0013] Preferably, in the step 4, a lifting lug is provided on the top of the pile foundation casing, and the guide device is detachably connected to the top of the pile foundation casing via the lifting lug.

[0014] Preferably, the guiding device in step 4 is adjustable in both vertical and horizontal directions.

[0015] Compared with the prior art, the technical solution disclosed in the present invention has the following beneficial effects: The present invention draws a hole on the in-situ pier column in water and sets a hole guide casing. Compared with drilling a pile foundation hole directly on the in-situ pier column in water, the hole guide height is greatly reduced, and the construction difficulty of drilling a hole directly on the in-situ pier column in water is reduced. A pile foundation casing is placed in the hole guide casing, and underwater concrete is poured in the bottom gap between the hole guide casing and the pile foundation casing. A guide device is set on the top of the pile foundation casing, and the pile foundation casing is fixed at both ends to form a stable support, and then the hole is punched downward along the center hole of the pile foundation casing to ensure the size, surface quality and verticality of the hole, ensure the quality of the pile foundation hole, and complete the construction of the new bridge pier on the basis of the pile foundation hole, thereby ensuring the quality of the new bridge pier. New bridge piers are built on the basis of the in-situ pier column, and the new bridge pier is ensured to be coaxial with the center of the in-situ pier column, thereby reducing the construction difficulty of the new bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0017] Figure 1 This is the front view after construction using the present invention; Figure 2 It is a top view after construction using the present invention.

[0018] Description of Figure Numbers: 1 steel trestle platform, 2 guide hole casing, 3 pile foundation casing, 4 underwater concrete. DETAILED DESCRIPTION

[0019] 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 core concept of the present invention and the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] A construction method for building new bridge piers on in-situ pier columns in water, such as Figure 1 As shown, the following steps are included: Step 1: Drilling: Use a drilling rig to drill a hole on the original pier column, aligning the center of the hole with the center of the pile position; Step 2, placing the lead hole casing 2: placing the lead hole casing 2 in the borehole obtained in step 1, with the top of the lead hole casing 2 being higher than the highest water surface; Step 3, placing the pile foundation casing 3: placing the pile foundation casing 3 in the guide hole casing 2, with the center of the pile foundation casing 3 aligned with the center of the pile position; Step 4: pour underwater concrete 4 in the gap between the guide hole casing 2 and the pile foundation casing 3, and set a guide device to firmly support the top of the pile foundation casing 3; Step 5: construct impact piles on the basis of the pile foundation casing 3.

[0021] The pile position center is the pile position center of the new bridge pier. By drilling holes on the original pier column in water and placing the guide hole casing 2, the guide hole height is greatly reduced compared to drilling directly on the original pier column in water to construct the pile foundation hole, and the construction difficulty of drilling directly on the original pier column in water is reduced. By placing the pile foundation casing 3 in the guide hole casing 2, and pouring underwater concrete 4 in the bottom gap between the guide hole casing 2 and the pile foundation casing 3, a guide device is set on the top of the pile foundation casing 3, and the two ends are fixed to form a stable support for the pile foundation casing 3, and then the hole is impacted downward along the center of the pile foundation casing 3 to ensure the size, surface quality and verticality of the hole, ensure the quality of the pile foundation hole, and complete the construction of the new bridge pier on the basis of the pile foundation hole, and ensure the quality of the new bridge pier. New bridge piers are built on the basis of the original pier column, and the new bridge pier is coaxial with the center of the original pier column, which reduces the construction difficulty of the new bridge.

[0022] On the basis of the above embodiment, in step 1, the drilling rig is set on the steel trestle platform 1. The steel trestle platform 1 is set up along the construction location of the new bridge, and the drilling rig used for drilling construction is arranged on the steel trestle platform 1. The surveying personnel use the control points on the steel trestle platform 1 and the total station to release the pile position center, and adjust the drilling rig center position according to the deviation results obtained by measurement until the center of the drilling rig coincides with the center of the pile position.

[0023] Based on the above embodiment, the drilling rig is a rotary drilling rig. Figure 2 As shown, the diameter of the hole formed by the rotary drilling rig is at least 20 cm larger than the outer diameter of the pile foundation casing 3, so as to facilitate the smooth installation of the guide hole casing 2 and the pile foundation casing 3. The guide hole is drilled on the original pier column by the drilling rig, and the hole depth is 1 m. On the one hand, the rotary drilling rig is more suitable for the construction of soil layers such as sand, clay, and silty soil. On the steel trestle platform 1, the drilling operation platform is limited. The geology of the original pier column in the water is relatively hard. The use of the rotary drilling rig is convenient to adjust the drilling speed by controlling the rotating speed of the turntable. On the other hand, the construction unit price of the rotary drilling rig is low, which can save construction costs.

[0024] On the basis of the above embodiment, the center of the lead hole casing 2 in step 2 is aligned with the center of the drill hole. Preferably, the center of the lead hole casing 2, the center of the drill hole and the center of the pile position of the new bridge pier are aligned with each other, the pile foundation casing 3 is located in the lead hole casing 2, the lead hole casing 2, the center of the drill hole and the center of the pile position are aligned, and the center of the pile foundation casing 3 is aligned with the center of the lead hole casing 2 to ensure that the center of the pile foundation casing 3 is consistent with the center of the pile position, and the gap between the pile foundation casing 3 and the lead hole casing 2 is uniform, which is convenient for the subsequent pouring of underwater concrete 4 in the gap between the pile foundation casing 3 and the lead hole casing 2, so that the pouring effect is better.

[0025] On the basis of the above embodiment, the guide hole casing 2 is clearance matched with the drill hole. The drilling rig makes a hole to support the bottom of the guide hole casing 2. The height of the guide hole casing 2 should be at least 1m higher than the highest water surface, so as to form a partition on the inner and outer sides of the guide hole casing 2. The clearance match can prevent the bottom of the guide hole casing 2 from tilting or shifting under the impact force of water, the force of sand and gravel or other external forces, thereby preventing the pile foundation casing 3 from being offset during installation.

[0026] Furthermore, the guide hole casing 2 in step 4 is connected to the bottom of the pile foundation casing 3 by underwater concrete pouring. The height of the guide hole casing 2 is less than the height of the pile foundation casing 3. Underwater concrete pouring is suitable for static water or water flow conditions with low flow rate. After the guide hole casing 2 is connected to the pile foundation casing 3, it is equivalent to thickening the bottom of the pile foundation casing 3, so that the supporting strength of the pile foundation is higher. The outer side of the guide hole casing 2 is installed in a borehole coaxial with the center of the pile position by plugging, and the inner side of the guide hole casing 2 is connected to the pile foundation casing 3 by underwater concrete 4, so that the guide hole casing 2 can stabilize the pile foundation casing 3, ensure that the pile foundation casing 3 is coaxial with the center of the pile position, and ensure the verticality of the pile foundation casing 3 after installation.

[0027] Based on the above embodiments, Figure 1 As shown, the top of the pile foundation casing 3 in step 3 is higher than the height of the steel trestle platform 1. The top of the pile foundation casing 3 protrudes from the surface of the steel trestle platform 1, which is convenient for adjusting the position, height and installation angle of the pile foundation casing 3 on the steel trestle platform 1 using a guide device.

[0028] Based on the above embodiments, Figure 1 As shown, the top of the pile foundation casing 3 is 30 cm higher than the height of the steel trestle platform 1. The 30 cm protrusion of the pile foundation casing 3 from the steel trestle platform 1 facilitates the adjustment of the position of the guide device on the steel trestle platform 1, and facilitates the subsequent construction of pile foundation holes along the internal hole of the pile foundation casing 3.

[0029] On the basis of the above embodiment, the guide device in step 4 is arranged on the steel trestle platform 1. The top of the pile foundation casing 3 protrudes from the surface of the steel trestle platform 1, and the guide device is arranged on the steel trestle platform 1, so that the guide device can adjust the position of the pile foundation casing 3 so that the center of the pile foundation casing 3 is aligned with the center of the pile position, and the bottom of the pile foundation casing 3 is aligned with the bottom of the guide hole casing 2.

[0030] On the basis of the above embodiment, the top of the pile foundation casing 3 in the step 4 is provided with a lifting lug, and the guide device is detachably connected to the top of the pile foundation casing 3 through the lifting lug. When the position of the pile foundation casing 3 needs to be adjusted, the guide device is connected to the lifting lug at the top of the pile foundation casing 3 through a steel wire rope, and after the position adjustment of the pile foundation casing 3 is completed, the guide device releases the lifting lug at the top of the pile foundation casing 3.

[0031] Based on the above embodiment, the guide device in step 4 is adjustable in both vertical and horizontal directions. The guide device can be a crane, and the cantilever of the crane adjusts the vertical height and horizontal position by telescoping and swinging, thereby adjusting the vertical height and horizontal position of the pile foundation casing 3.

[0032] The details not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0033] The above content shows and describes the basic principles, main features and beneficial effects of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for building a new bridge pier on an in-situ pier column in water, characterized by: The method comprises the following steps: Step 1, drilling: using a drilling machine to drill a hole on the in-situ pier column, and aligning the center of the hole with the center of the pile position; Step 2, placing the guide hole casing (2): placing the guide hole casing (2) in the borehole obtained in step 1, with the top of the guide hole casing (2) being higher than the water surface; Step 3, placing the pile foundation casing (3): placing the pile foundation casing (3) in the guide hole casing (2), with the center of the pile foundation casing (3) aligned with the center of the pile position; Step 4: pouring underwater concrete (4) in the gap between the guide hole casing (2) and the pile foundation casing (3), and setting a guide device to firmly support the top of the pile foundation casing (3); Step 5: construct impact piles on the basis of the pile foundation casing (3).

2. The construction method for building a new bridge pier on an in-situ pier column in water according to claim 1, characterized in that: In step 1, the drilling rig is set on the steel trestle platform (1).

3. The construction method for building a new bridge pier on an in-situ pier column in water according to claim 2, characterized in that: The drilling rig is a rotary drilling rig.

4. The construction method for building a new bridge pier on an in-situ pier column in water according to claim 3, characterized in that: In the second step, the center of the borehole casing (2) is aligned with the center of the drilled hole.

5. The construction method for building a new bridge pier on an in-situ pier column in water according to claim 4, characterized in that: The hole guide casing (2) is in clearance fit with the drill hole.

6. The construction method for building a new bridge pier on an in-situ pier column in water according to claim 5, characterized in that: The top of the pile foundation casing (3) in step three is higher than the height of the steel trestle platform (1).

7. The construction method for building a new bridge pier on an in-situ pier column in water according to claim 6, characterized in that: The top of the pile foundation casing (3) is 30 cm higher than the height of the steel trestle platform (1).

8. The construction method for building a new bridge pier on an in-situ pier column in water according to claim 7, characterized in that: The guide device in step 4 is arranged on the steel trestle platform (1).

9. The construction method for building a new bridge pier on an in-situ pier column in water according to claim 8, characterized in that: In the fourth step, a lifting lug is provided on the top of the pile foundation casing (3), and the guide device is detachably connected to the top of the pile foundation casing (3) via the lifting lug.

10. The construction method for building a new bridge pier on an in-situ pier column in water according to claim 9, characterized in that: The guiding device in step 4 is adjustable in both vertical and horizontal directions.

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