Three-side type lock steel pipe pile cofferdam and construction method thereof

Abstract

The application provides a three-side locking steel pipe pile cofferdam and a construction method thereof, and comprises the following steps: S1, a trestle platform is built, a rotary drilling machine is located on the trestle platform, and three-side groove hole construction is completed; S2, impact drilling is used to complete two anchor piles on the shore side; S3, a locking steel pipe pile guide frame is arranged on the trestle platform, the locking steel pipe pile is inserted and driven, and a cofferdam is formed; S4, the inner side groove section of the cofferdam is cleaned, the inner side groove section is poured with concrete, and the outer side of the cofferdam is simultaneously backfilled with sand; S5, a first layer of inner support is installed, and the first layer of inner support is connected with the anchor piles; S6, water is pumped out of the cofferdam, and a second layer of inner support and a third layer of inner support are gradually installed; S7, water is pumped out to the bottom of the foundation pit, an excavator is used for excavation until the designed depth, and the excavation is stopped; S8, building construction is carried out in the cofferdam, the construction is completed, and the cofferdam is removed. The application combines the rock wall of the steep rock shore with the locking steel pipe pile, reduces the total steel structure consumption of the cofferdam, saves the construction period, and reduces the construction cost.

Description

Technical Field

[0001] The present invention relates to the technical field of cofferdams, and in particular to a three-sided locking steel pipe pile cofferdam and a construction method thereof. Background Art

[0002] A cofferdam is a temporary retaining structure used to build permanent water conservancy facilities during water conservancy project construction. Its function is to prevent water and soil from entering the construction site, allowing drainage to be drained within the cofferdam, foundation pits to be excavated, and buildings to be constructed.

[0003] Cofferdams are generally used in hydraulic structures and are dismantled after use. The height of the cofferdam is higher than the highest water level that may occur during the construction period.

[0004] In actual use, a four-sided closed cofferdam is generally used. Although the four-sided closed cofferdam is widely used, under the geological conditions of steep slopes and bare rocks close to the shore, the traditional four-sided closed cofferdam cannot directly drive large-diameter steel pipe piles. The drilling and pile planting are difficult to implement and the operation is inconvenient, which will affect the construction of the cofferdam. If it is too far away from the steep slope and bare rock coast, the construction requirements cannot be met. Summary of the Invention

[0005] The main purpose of the present invention is to provide a three-sided locking steel pipe pile cofferdam and a construction method thereof, so as to solve the problem of inconvenience in cofferdam construction in a steep slope bare rock environment close to the shore.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A three-sided locking steel pipe pile cofferdam construction method comprises the following steps:

[0008] S1. Build the trestle platform. Position the rotary drilling rig on the trestle platform, complete the three-sided groove drilling, and install the steel casing for the drilling.

[0009] S2: The impact drill completes the construction of two anchor piles on the shore side;

[0010] S3. Pull out the steel casing of the lead hole, set up the guide frame of the locking steel pipe pile on the trestle platform, and insert the locking steel pipe pile to form the cofferdam;

[0011] S4. Clean the inner trough section of the cofferdam, pour concrete in the inner trough section, and simultaneously backfill sand on the outer side of the cofferdam;

[0012] S5. Install the first layer of internal support, which is connected to the anchor piles;

[0013] S6. Pump water out of the cofferdam and gradually install the second and third layers of internal supports;

[0014] S7. Pump water to the bottom of the foundation pit, and start excavation with an excavator until the designed depth is reached, and then stop excavation;

[0015] S8. Carry out construction inside the cofferdam. After the construction is completed, dismantle the cofferdam.

[0016] In the preferred solution, in S3, the top of the locking steel pipe pile is higher than the water level;

[0017] In S7, the rock wall is supported while the excavator is excavating and internal supports are set;

[0018] In S8, the concrete bottom seal and foundation are poured at the bottom of the pit;

[0019] Before dismantling the cofferdam, water is returned, and the internal supports are removed from bottom to top while returning water, and finally the locking steel pipe piles are removed.

[0020] In the preferred solution, the locking steel pipe piles on the shore side are provided with a diaphragm structure, which scans the shape of the rock wall and the edges of the diaphragm structure are cut according to the shape of the rock wall;

[0021] Concrete is poured between the interlocking steel pipe piles, rock wall and diaphragm structure;

[0022] The locking steel pipe piles on the shore side are equipped with a heating mechanism. During the concrete pouring process, the heating mechanism works to accelerate the solidification of the concrete.

[0023] A connecting groove is opened in the rock wall, and the partition structure extends into the connecting groove.

[0024] In a preferred solution, in S6, after pumping water to the set water level, a second layer of cofferdam is constructed, and then a second layer of internal support is installed;

[0025] After continuing to pump water to the next set water level, construct the third layer of cofferdam and then install the third layer of internal support;

[0026] Similarly, construct multiple layers of cofferdams and internal supports.

[0027] A three-sided locking steel pipe pile cofferdam includes a plurality of locking steel pipe piles, slope side piles and two anchor piles, wherein the anchor piles, locking steel pipe piles and slope side piles extend into the interior of the rock formation;

[0028] The slope side piles are close to the steep slope rock, and the combination of the locking steel pipe piles and the slope side piles is U-shaped, forming a three-sided cofferdam;

[0029] Brackets are provided between the anchor piles, locking steel pipe piles and slope side piles.

[0030] In a preferred embodiment, the support comprises an inner support fixed to the inner side of the three-sided cofferdam;

[0031] A first support rod is provided between the inner support and the anchor pile;

[0032] A second support rod is provided at the inner support corner;

[0033] A third support rod is provided between the two ends of the inner support;

[0034] The inner support is provided with 2-5 layers.

[0035] In a preferred solution, a heating mechanism is provided in the slope pile, and the heating mechanism includes a fixing seat;

[0036] A plurality of connecting rods are provided on the outer periphery of the fixing seat, and the connecting rods are provided with heating sleeves, and the fixing seat and the connecting rods are located on the inner side of the heating sleeve;

[0037] The heating sleeve is close to the inner wall of the slope pile;

[0038] A bottom plate is provided at the bottom of the heating jacket, and a heating ring is provided inside the heating jacket;

[0039] A battery is provided on the top of the base plate and is electrically connected to the heating ring;

[0040] A connecting block is provided on the top of the fixing seat, and a draw rope is provided on the connecting block.

[0041] In a preferred solution, a support mechanism is provided on the top of the slope pile, and the support mechanism includes two cross bars;

[0042] A partition is provided at the opposite end of the two crossbars, and a fixed shaft is provided between the two partitions;

[0043] A winding drum is provided outside the fixed shaft, and one end of a pull rope is wound around the winding drum;

[0044] Several bearings are provided between the winding drum and the fixed shaft;

[0045] A limiting plate is provided on one side of the crossbar away from the partition. The limiting plate is located on the outer peripheral surface of the slope side pile and is arc-shaped.

[0046] In a preferred embodiment, a pull rod is provided at the bottom of the crossbar, a wire sleeve is provided at the bottom end of the pull rod, and the pull rope passes through the wire sleeve;

[0047] The winding drum is provided with a fixed block, which is hinged to the limit rod;

[0048] A limiting groove is provided on the top of the partition, and the diameter of the limiting rod is adapted to the limiting groove.

[0049] In the preferred solution, a connecting buckle and a clamping plate are provided at the top of the slope pile close to the steep rock, and the connecting buckle and the clamping plate are combined to form a U shape;

[0050] The splint is located outside the slope pile, and the splint and the connecting buckle are arc-shaped;

[0051] The splint is provided with several protective plates, which are perpendicular to the steep rock;

[0052] The side of the protective plate away from the slope edge pile is adapted to the steep slope rock.

[0053] The present invention provides a three-sided locking steel pipe pile cofferdam and a construction method thereof. By adopting the above scheme, the following beneficial effects are achieved:

[0054] 1. The rock wall of the steep slope rock near the shore is combined with the locking steel pipe piles to reduce the overall steel structure usage of the cofferdam, save construction time, and reduce overall construction costs.

[0055] 2. There are fewer construction steps, simpler operation, easier construction, and increased work efficiency.

[0056] 3. Heat the concrete during cofferdam construction to ensure the concrete setting effect and efficiency, and thus ensure the sealing of the connection between the cofferdam and the steep slope rock.

[0057] 4. The steel pipe piles close to the rock wall are equipped with an isolation structure to increase the connection with the rock wall and facilitate the pouring and molding of concrete.

[0058] 5. It is easy to adjust the height of the heating structure as needed to meet different usage requirements and has better adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The present invention will be further described below with reference to the accompanying drawings and examples:

[0060] Figure 1 It is a structural schematic diagram of the present invention during construction;

[0061] Figure 2 It is a top view of the present invention during construction;

[0062] Figure 3 Schematic diagram of the internal structure of the slope side pile of the present invention;

[0063] Figure 4 Schematic diagram of the internal structure of the heating jacket of the present invention;

[0064] Figure 5 is a schematic diagram of the internal structure of the support mechanism of the present invention;

[0065] Figure 6 It is a schematic structural diagram of an embodiment of the top of the slope side pile according to the present invention.

[0066] In the picture:

[0067] Rock layer 101, steep slope rock 102, building 103, trestle platform 2, locking steel pipe pile 3, anchor pile 4, slope side pile 5, bracket 6, inner support 601, first support rod 602, second support rod 603, third support rod 604, fixing seat 701, connecting rod 702, heating sleeve 703, bottom plate 704, connecting block 705, pull rope 706, heating ring 707, battery 708, support mechanism 8, cross bar 801, limit plate 802, partition 803, fixed shaft 804, winding drum 805, pull rod 806, wire sleeve 807, fixing block 808, limit groove 809, limit rod 810, connecting buckle 901, splint 902, protective plate 903. DETAILED DESCRIPTION

[0068] Example 1:

[0069] like Figure 1 and 2 As shown, a three-sided locking steel pipe pile cofferdam construction method includes the following steps:

[0070] S1. Build the trestle platform 2. The trestle platform 2 adopts the trestle platform 2 commonly used in offshore construction. The trestle platform 2 is a circular shape. The equipment needed for the construction is located on the trestle platform 2. The equipment used includes a rotary drilling rig, an impact drill, an air mud suction machine, a crawler crane and a sky pump. The rotary drilling rig is used to complete the three-sided groove and hole construction, and the hole steel casing is constructed to facilitate the subsequent installation of the locking steel pipe piles.

[0071] S2. The impact drill completes the construction of two anchor piles 4 on the shore side. The anchor piles 4 are close to the steep slope rock near the shore and are preferably located in the concave part of the steep slope rock near the shore. The anchor piles 4 are preferably reinforced concrete anchor piles 4.

[0072] S3. Pull out the steel casing of the lead hole, and set a locking steel pipe pile guide frame on the trestle platform 2. The locking steel pipe pile guide frame is a commonly used guide frame for existing locking steel pipe piles. With the help of the guiding effect of the guide frame, the locking steel pipe piles are inserted and driven. The top of the locking steel pipe pile is higher than the water level to form a cofferdam. The cofferdam is a three-sided cofferdam, which cooperates with the steep slope rock. The cofferdam of this application not only meets the functions of a conventional cofferdam, but also makes construction operation more convenient, simplifies the construction operation process, increases construction efficiency, reduces the use of steel casings, etc., and saves costs.

[0073] S4. Use an air suction sludge machine to clean the inner trough section of the cofferdam, and then pour concrete into the inner trough section through a sky pump. Preferably, fine stone concrete is poured. Simultaneously, sand is backfilled on the outside of the cofferdam to maintain the stability of the cofferdam.

[0074] S5. Install the first layer of inner support. When installing the first layer of inner support, first weld the cofferdam corbels on the locking steel pipe piles, and then install the first inner support through the cofferdam corbels;

[0075] The first inner support is connected to the anchor pile 4 to increase the strength of the first layer of inner support and the cofferdam as a whole.

[0076] S6. Pump water out of the cofferdam and gradually install the second and third layers of internal supports;

[0077] Specifically, after pumping water to the set water level, the second cofferdam is constructed, and then the second layer of internal support is installed; after continuing to pump water to the next set water level, the third cofferdam is constructed, and then the third layer of internal support is installed; the value of the set water level is determined according to the actual construction standard, and the second and third cofferdams are set up using the existing cofferdam structure;

[0078] And by analogy, multiple layers of cofferdams and internal supports can be constructed, which is simple to operate, easy to connect and ensure the stability of the cofferdam;

[0079] It is also possible to set up multiple layers of internal supports instead of multiple layers of cofferdams, depending on the actual construction requirements.

[0080] S7. Pump water to the bottom of the foundation pit and excavate with an excavator until the designed depth is reached, then stop excavating. Support the rock walls and install internal supports to ensure the stability of the foundation pit walls. For areas with harder rock, use a breaker hammer to break it before excavation. For areas prone to collapse, reinforce them with shotcrete and anchor bolts to ensure the safety of construction personnel and equipment.

[0081] S8, carry out construction inside the cofferdam, pour concrete to seal the bottom and foundation at the bottom of the pit, that is, construct the building 103. The building 103 is determined according to the actual construction requirements, such as the support columns of the water building, etc.

[0082] After the construction is completed, the cofferdam is removed. Before the cofferdam is removed, the water is returned. While returning the water, the internal supports are removed from bottom to top, and finally the locking steel pipe piles are pulled out. For example, the third layer of internal supports is removed first, and then the water is returned to the area near the second layer of internal supports, the second layer of internal supports is removed, and the water is continued to be returned to the first layer of internal supports, the first layer of internal supports is removed, and finally the water is returned to the conventional horizontal plane, and the locking steel pipe piles are pulled out. The preferred methods for pulling out the piles are vibratory hammers and hydraulic jacks.

[0083] In a further embodiment, the locking steel pipe piles on the shore side are provided with a partition structure, and the shape of the rock wall is scanned using three-dimensional laser scanning technology. The edge of the partition structure is trimmed based on the scanning results so that the partition fits the rock wall; then concrete is poured between the locking steel pipe piles, the rock wall and the partition structure; after the poured concrete solidifies, the locking steel pipe piles at the edge can be sealed from the rock wall of the steep slope rock 102, which is convenient for the subsequent use of the cofferdam.

[0084] Furthermore, the locking steel pipe piles on the shore side are equipped with a heating mechanism. During the concrete pouring process, the heating mechanism works to solidify the concrete at a suitable temperature, ensuring the efficiency and quality of concrete solidification.

[0085] In a preferred embodiment, a connecting groove is opened in the rock wall, and the partition structure extends into the connecting groove, so that the connection between the partition structure and the rock wall of the steep rock 102 is more stable, thereby ensuring a sealing effect.

[0086] By using the above method, the rock wall of the steep rock 102 close to the shore is combined with the locking steel pipe piles to reduce the overall steel structure usage of the cofferdam, save construction time, and reduce the overall construction cost.

[0087] Example 2:

[0088] like Figure 1 and 2 As shown, a three-sided locking steel pipe pile cofferdam includes several locking steel pipe piles 3, slope piles 5 and two anchor piles 4. The anchor piles 4, locking steel pipe piles 3 and slope piles 5 extend into the rock layer 101 to ensure the stability and bearing capacity of the cofferdam.

[0089] The slope side piles 5 are close to the steep slope rock 102, and the locking steel pipe piles 3 and the slope side piles 5 are combined into a U shape to form a three-sided cofferdam; the rock wall of the steep slope rock 102 close to the shore is combined with the three-sided cofferdam, which not only achieves the use effect of the existing four-sided closed cofferdam, but also reduces the overall steel structure usage of the cofferdam, saves construction time, and reduces the overall construction cost.

[0090] In a further embodiment, a support 6 is provided between the anchor piles 4, the locking steel pipe piles 3, and the slope side piles 5. Specifically, the support 6 comprises an inner support 601 fixed to the inner side of the three-sided cofferdam. A first support rod 602 is provided between the inner support 601 and the anchor pile 4. This first support rod 602 is used to strengthen the connection between the inner support and the anchor pile 4, thereby increasing the overall strength. A second support rod 603 is provided at the corner of the inner support 601 to improve the stability of the corner. A third support rod 604 is provided between the two ends of the inner support 601 to enhance the overall rigidity of the inner support. The inner support 601 can be arranged in two to five layers, depending on the actual project requirements.

[0091] Example 3:

[0092] like Figure 3 、 4As shown in , 5 and 6 , a heating mechanism is provided in the slope pile 5, and the heating mechanism includes a fixed seat 701. Several connecting rods 702 are arranged on the periphery of the fixed seat 701. The fixed seat 701 is provided with an existing control circuit board and a temperature sensor. A heating sleeve 703 is provided on the connecting rod 702. The fixed seat 701 and the connecting rod 702 are located on the inner side of the heating sleeve 703. The heating sleeve 703 fits tightly against the inner wall of the slope pile 5 to ensure that heat can be effectively transferred. A heating ring 707 is installed inside the heating sleeve 703. When in use, heat is generated by the heating ring 707, and the heat is transferred to the slope pile 5 through the heating sleeve 703, thereby heating the concrete around the slope pile 5 to ensure that the concrete between the slope pile 5 and the steep slope rock 102 can solidify efficiently, thereby increasing the stability of the connection and avoiding water leakage; at the same time, the temperature is detected by the temperature sensor, and the temperature signal is transmitted to the control circuit board. The control circuit board is preset with an existing control chip and control program, and the maximum temperature and heating temperature are preset. The specific values ​​of the maximum temperature and heating temperature are determined according to actual use requirements. When the temperature is higher than the maximum temperature, the control circuit board controls the heating ring 707 to cut off the power. When the temperature is lower than the heating temperature, the control circuit board controls the heating ring 707 to work, thereby maintaining temperature stability for the solidification of the concrete.

[0093] A base plate 704 is installed at the bottom of the heating jacket 703 to isolate impurities below. A battery 708 is mounted on top of the base plate 704. The battery 708 is encased in a waterproof casing, using a conventional waterproof battery box. The battery 708 is electrically connected to the heating ring 707, providing power for the heating ring 707. A connecting block 705 is located at the top of the mounting base 701. A pull cord 706 is attached to the connecting block 705, extending to the top of the slope side pile 5. This pull cord is used to raise and lower the heating mechanism, thereby controlling its height and facilitating its removal and placement.

[0094] In a further embodiment, a support mechanism 8 is provided on the top of the slope pile 5, and the support mechanism 8 includes two cross bars 801, and the cross bars 801 are preferably square bars to prevent the cross bars 801 from rotating;

[0095] A partition 803 is provided at the opposite end of the two horizontal bars 801, and a fixed shaft 804 is provided between the two partitions 803; a winding drum 805 is provided outside the fixed shaft 804, and one end of the pull rope 706 is wound around the winding drum 805; when in use, the pull rope 706 can be retracted and released by rotating the winding drum 805, thereby adjusting the height of the heating mechanism to meet different usage requirements.

[0096] Several bearings are provided between the winding drum 805 and the fixed shaft 804 to reduce the frictional resistance of rotation;

[0097] A limit plate 802 is provided on the side of the cross bar 801 away from the partition 803. The limit plate 802 is located on the outer peripheral surface of the slope edge pile 5 and is used to limit the movement range of the cross bar to ensure the stability of the support mechanism. The limit plate 802 is arc-shaped. The arc-shaped design is used to increase the fit between the limit plate 802 and the slope edge pile 5 and increase the stability of the support mechanism.

[0098] Furthermore, a pull rod 806 is provided at the bottom of the crossbar 801, and a wire sleeve 807 is provided at the bottom end of the pull rod 806. The pull rope 706 passes through the wire sleeve 807; it is used to strengthen the restraint of the pull rope 706 and increase the stability of the connection between the pull rope 706 and the winding drum 805;

[0099] The winding drum 805 is provided with a fixing block 808 , and the fixing block 808 is hinged to a limiting rod 810 ; a limiting groove 809 is provided on the top of the partition 803 , and the diameter of the limiting rod 810 is adapted to the limiting groove 809 .

[0100] Under normal circumstances, the limit rod 810 is located inside the limit groove 809, thereby limiting the rotation of the limit rod 810, and ultimately limiting the rotation of the winding drum 805 to maintain a constant height of the heating mechanism. When the height of the heating mechanism needs to be adjusted, the limit rod 810 is turned away from the limit groove 809, and then rotated circumferentially along the winding drum 805, which can drive the winding drum 805 to rotate the retractable pull rope 706 to adjust the height of the heating mechanism. After the height is appropriate, the limit rod 810 is turned back to the limit groove 809 to complete the limitation.

[0101] In a further embodiment, a connecting buckle 901 and a clamping plate 902 are provided at the top of the slope pile 5 near the steep rock 102. The connecting buckle 901 and the clamping plate 902 are combined into a U shape, and can be hung on the top of the slope pile 5 through the cooperation of the connecting buckle 901 and the clamping plate 902; the clamping plate 902 is located outside the slope pile 5, and the clamping plate 902 and the connecting buckle 901 are arc-shaped, so that the connecting buckle 901 and the clamping plate 902 can fit the slope pile 5 more closely;

[0102] The splint 902 is provided with several protective plates 903, and the protective plates 903 are perpendicular to the steep slope rock 102; the side of the protective plate 903 away from the slope pile 5 is adapted to the steep slope rock 102, so that when in use, the protective plate 903 is hung on the slope pile 5 through the splint 902 and the connecting buckle 901, and the other end of the protective plate 903 is close to the steep slope rock 102. Preferably, a groove is opened in the steep slope rock 102, and the protective plate 903 extends into the groove, so as to facilitate the subsequent pouring of concrete, so as to facilitate the concrete coagulation and forming of concrete between the slope pile 5, the steep slope rock 102 and the protective plate 903, thereby ensuring the sealing after connection.

[0103] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A three-sided locking steel pipe pile cofferdam construction method, characterized by: The steps include: S1. Build the trestle platform. Position the rotary drilling rig on the trestle platform, complete the three-sided groove drilling, and install the steel casing for the drilling. S2: The impact drill completes the construction of two anchor piles on the shore side; S3. Pull out the steel casing of the lead hole, set up the guide frame of the locking steel pipe pile on the trestle platform, and insert the locking steel pipe pile to form the cofferdam; S4. Clean the inner trough section of the cofferdam, pour concrete in the inner trough section, and simultaneously backfill sand on the outer side of the cofferdam; S5. Install the first layer of internal support, which is connected to the anchor piles; S6. Pump water out of the cofferdam and gradually install the second and third layers of internal supports; S7. Pump water to the bottom of the foundation pit, and start excavation with an excavator until the designed depth is reached, and then stop excavation; S8. Carry out construction inside the cofferdam. After the construction is completed, dismantle the cofferdam. The locking steel pipe piles on the shore side are equipped with a diaphragm structure, which scans the shape of the rock wall and the edges of the diaphragm structure are cut according to the shape of the rock wall; Concrete is poured between the interlocking steel pipe piles, rock wall and diaphragm structure; The locking steel pipe piles on the shore side are equipped with a heating mechanism. During the concrete pouring process, the heating mechanism works to accelerate the solidification of the concrete. A connecting groove is opened in the rock wall, and the partition structure extends into the connecting groove.

2. The three-sided locking steel pipe pile cofferdam construction method according to claim 1 is characterized by: In S3, the top of the locking steel pipe pile is higher than the water level; In S7, the rock wall is supported while the excavator is excavating and internal supports are set; In S8, the concrete bottom seal and foundation are poured at the bottom of the pit; Before dismantling the cofferdam, water is returned, and the internal supports are removed from bottom to top while returning water, and finally the locking steel pipe piles are removed.

3. The three-sided locking steel pipe pile cofferdam construction method according to claim 1, characterized in that: in S6, after pumping water to the set water level, the second layer of cofferdam is constructed, and then the second layer of internal support is installed; After continuing to pump water to the next set water level, construct the third layer of cofferdam and then install the third layer of internal support; Similarly, construct multiple layers of cofferdams and internal supports.

4. A three-sided locking steel pipe pile cofferdam, characterized by: It comprises a plurality of locking steel pipe piles (3), slope side piles (5) and two anchor piles (4), wherein the anchor piles (4), the locking steel pipe piles (3) and the slope side piles (5) extend into the interior of the rock layer (101); The slope side piles (5) are close to the steep slope rock (102), and the locking steel pipe piles (3) and the slope side piles (5) are combined into a U shape to form a three-sided cofferdam; A bracket (6) is provided between the anchor pile (4), the locking steel pipe pile (3) and the slope pile (5); A heating mechanism is provided in the slope pile (5), and the heating mechanism includes a fixing seat (701); A plurality of connecting rods (702) are provided on the outer periphery of the fixing seat (701), the connecting rods (702) are provided with a heating sleeve (703), and the fixing seat (701) and the connecting rods (702) are located on the inner side of the heating sleeve (703); The heating sleeve (703) is close to the inner wall of the slope pile (5); A bottom plate (704) is provided at the bottom of the heating jacket (703), and a heating ring (707) is provided inside the heating jacket (703); A battery (708) is provided on the top of the bottom plate (704), and the battery (708) is electrically connected to the heating ring (707); A connecting block (705) is provided on the top of the fixing seat (701), and a drawstring (706) is provided on the connecting block (705).

5. The three-sided locking steel pipe pile cofferdam according to claim 4 is characterized by: The support (6) includes an inner support (601) fixed to the inner side of the three-sided cofferdam; A first support rod (602) is provided between the inner support (601) and the anchor pile (4); A second support rod (603) is provided at a corner of the inner support (601); A third support rod (604) is provided between the two ends of the inner support (601); The inner support (601) is provided with 2-5 layers.

6. The three-sided locking steel pipe pile cofferdam according to claim 4, characterized in that: A support mechanism (8) is provided on the top of the slope pile (5), and the support mechanism (8) includes two cross bars (801); A partition plate (803) is provided at the opposite end of the two cross bars (801), and a fixed shaft (804) is provided between the two partition plates (803); A winding drum (805) is provided on the outside of the fixed shaft (804), and one end of a pull rope (706) is wound around the winding drum (805); A plurality of bearings are provided between the winding drum (805) and the fixed shaft (804); A limiting plate (802) is provided on one side of the crossbar (801) away from the partition (803), the limiting plate (802) is located on the outer peripheral surface of the slope side pile (5), and the limiting plate (802) is arc-shaped.

7. The three-sided locking steel pipe pile cofferdam according to claim 6, characterized in that: A pull rod (806) is provided at the bottom of the crossbar (801), a wire sleeve (807) is provided at the bottom end of the pull rod (806), and the pull rope (706) passes through the wire sleeve (807); The winding drum (805) is provided with a fixed block (808), and the fixed block (808) is hinged to a limit rod (810); A limiting groove (809) is provided on the top of the partition (803), and the diameter of the limiting rod (810) is adapted to the limiting groove (809).

8. The three-sided locking steel pipe pile cofferdam according to claim 4, characterized in that: A connecting buckle (901) and a splint (902) are provided at the top of the slope side pile (5) close to the steep rock (102), and the connecting buckle (901) and the splint (902) are combined to form a U shape; The splint (902) is located outside the slope pile (5), and the splint (902) and the connecting buckle (901) are arc-shaped; The clamping plate (902) is provided with a plurality of protective plates (903), and the protective plates (903) are perpendicular to the steep rock (102); The side of the protective plate (903) away from the slope pile (5) is adapted to the steep slope rock (102).

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