Construction platform and construction method for a construction platform

Abstract

The application discloses a construction platform and a construction method, and relates to the field of construction platforms, and aims to improve the drilling efficiency and the hole forming quality of the construction platform.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and in particular to a construction platform and a construction method for the construction platform. Background Technology

[0002] With the continuous advancement of bridge construction technology, large-diameter, ultra-long pile foundations are increasingly being used in large bridges. Currently, mature pile foundation drilling techniques include manual excavation, impact drilling, rotary drilling, and rotary drilling. Large-diameter, ultra-long pile foundations generally employ rotary drilling and rotary drilling.

[0003] For large-diameter, ultra-long pile foundations in deep water, a steel platform is required as a drilling platform. However, due to the limitations of the drilling platform's bearing capacity and the pile length, using rotary drilling rigs for drilling requires increasing the design bearing capacity of the drilling steel platform, significantly increasing costs. Furthermore, the quality of borehole formation for ultra-long pile foundations using rotary drilling rigs is difficult to guarantee, easily leading to borehole deviation and misalignment; therefore, this method is not suitable. Due to the limitations of the drilling rig itself, using a fully hydraulic rotary drilling rig is inefficient and time-consuming, and requires a large area, making it unsuitable for sole use. Therefore, it is necessary to invent a borehole formation method suitable for large-diameter, ultra-long pile foundations in deep water, overcoming the shortcomings of conventional borehole formation processes, improving borehole quality, shortening the construction period, and reducing costs. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a construction platform. The construction platform of this application has high drilling efficiency and good hole quality, which helps to shorten the construction period and reduce construction costs.

[0005] The present invention also proposes a construction method for the above-mentioned construction platform.

[0006] The construction platform according to the present invention includes: a drilling platform; a first drilling device and a second drilling device, wherein the first drilling device and the second drilling device are respectively disposed on the drilling platform; wherein the first drilling device is provided with a movable base, and the first drilling device is movably disposed on the drilling platform to be suitable for performing a first-stage drilling operation on a first section of a pile foundation; the second drilling device is constructed as a hydraulic rotary drilling rig, and the second drilling device is suitable for performing a second-stage drilling operation on the pile foundation, wherein the first drilling device and the second drilling device alternately drill the same pile foundation.

[0007] This application involves setting up a first drilling device and a second drilling device on a drilling platform to work alternately. The first drilling device and the second drilling device alternately drill the same pile foundation on the drilling platform, which ensures the drilling depth and hole quality, improves construction efficiency, shortens the construction period, and reduces the cost of bridge construction.

[0008] According to one embodiment of the present invention, the construction platform further includes: a first drill bit disposed on the first drilling device, and a wire brush detachably disposed on the outer periphery of the first drill bit, the wire brush being adapted to clean the mud on the inner wall of the borehole casing during the movement of the first drill bit.

[0009] According to one embodiment of the present invention, the construction platform further includes an electromagnet, which is disposed on the drilling platform and adapted to extend into the borehole casing and remove metal debris from the borehole casing.

[0010] According to one embodiment of the present invention, the drilling platform includes: pipe piles, wherein multiple pipe piles are constructed, each pipe pile being supported on the bottom of a riverbed; a horizontal connecting structure, wherein the horizontal connecting structure connects two adjacent pipe piles; and a bridge deck, wherein the bridge deck covers the top of the pipe piles, and the top of the bridge deck forms a working surface suitable for supporting the first drilling device and the second drilling device.

[0011] According to one embodiment of the present invention, the drilling platform further includes: a diagonal brace, one end of which is connected to the pipe pile or the horizontal coupling device, the other end of which is supported on the bridge deck, and the extension direction of the diagonal brace intersects with the extension direction of the pipe pile.

[0012] The control method according to another embodiment of the present invention is briefly described below.

[0013] The control method according to the present invention includes:

[0014] Build a drilling platform;

[0015] The first drilling device performs the first stage of drilling operations on the pile foundation;

[0016] The second drilling device performs a second drilling operation on the pile foundation, and the depth of the second drilling section is greater than the depth of the first drilling section.

[0017] According to one embodiment of the present invention, the control method further includes:

[0018] Before the first drilling operation is carried out on the pile foundation by the first drilling device, the inside of the pile foundation casing is cleaned and iron impurities inside the casing are removed.

[0019] According to one embodiment of the present invention, the first drilling device performs a first stage of drilling operation on the pile foundation, comprising:

[0020] The first drilling device is equipped with a drill bit with a wire brush and uses a first rotation speed to drill the upper section of the first drilling section at the first rotation speed.

[0021] The first drilling device performs drilling operations on the lower section of the first drilling segment using a second rotational speed; wherein

[0022] The first rotational speed is greater than the second rotational speed.

[0023] According to one embodiment of the present invention, the second drilling operation includes:

[0024] The hydraulic rotary drilling rig performs relay drilling on the hole completed by the first drilling device and increases the viscosity of the mud by drilling into the gravel layer.

[0025] According to one embodiment of the present invention, after the second drilling device completes the second stage of drilling, the method further includes:

[0026] The second drilling device uses the drilling rig air lift method to replace the high-concentration mud in the hole with freshly mixed mud.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a construction platform layout diagram according to an embodiment of the present invention;

[0030] Figure 2 This is a structural diagram of a construction platform according to an embodiment of the present invention;

[0031] Figure 3 This is a top view of a construction platform according to an embodiment of the present invention;

[0032] Figure 4 This is a flowchart of a construction method according to an embodiment of the present invention.

[0033] Figure label:

[0034] Construction platform 1;

[0035] First drilling device 11; Second drilling device 12;

[0036] Pipe piles 13; horizontal bracing structure 14; bridge deck 15; diagonal bracing 16. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] With the continuous advancement of bridge construction technology, large-diameter, ultra-long pile foundations are increasingly being used in large bridges. Currently, mature pile foundation drilling techniques include manual excavation, impact drilling, rotary drilling, and rotary drilling. Large-diameter, ultra-long pile foundations generally employ rotary drilling and rotary drilling.

[0039] For large-diameter, ultra-long pile foundations in deep water, a steel platform is required as a drilling platform. However, due to the limitations of the drilling platform's bearing capacity and the pile length, using rotary drilling rigs for drilling requires increasing the design bearing capacity of the drilling steel platform, significantly increasing costs. Furthermore, the quality of borehole formation for ultra-long pile foundations using rotary drilling rigs is difficult to guarantee, easily leading to borehole deviation and misalignment; therefore, this method is not suitable. Due to the limitations of the drilling rig itself, using a fully hydraulic rotary drilling rig is inefficient and time-consuming, and requires a large area, making it unsuitable for sole use. Therefore, it is necessary to invent a borehole formation method suitable for large-diameter, ultra-long pile foundations in deep water, overcoming the shortcomings of conventional borehole formation processes, improving borehole quality, shortening the construction period, and reducing costs.

[0040] The following is for reference. Figures 1-3 A construction platform according to an embodiment of the present invention is described.

[0041] The construction platform 1 according to the present invention includes a drilling platform, a first drilling device 11 and a second drilling device 12, wherein the first drilling device 11 and the second drilling device 12 are respectively disposed on the drilling platform; wherein the first drilling device 11 is provided with a movable base, and the first drilling device 11 is movably disposed on the drilling platform to be suitable for performing a first-stage drilling operation on a first section of the pile foundation; the second drilling device 12 is constructed as a hydraulic rotary drilling rig, and the second drilling device 12 is suitable for performing a second-stage drilling operation on the pile foundation, wherein the first drilling device 11 and the second drilling device 12 alternately drill the same pile foundation.

[0042] Specifically, the drilling platform can use steel casing and steel pipe piles 13 as foundation piles. The first drilling device 11 can be movably installed on the drilling platform, making it convenient to move the first drilling device 11 to the construction position for drilling. The first drilling device 11 can be constructed as a crawler-type rotary drilling rig. The crawler-type rotary drilling rig has a fast drilling speed, small footprint, and convenient movement, ensuring construction efficiency. In the early stage of construction, the first drilling device 11 is used for drilling. After the first stage of drilling is completed, the second drilling device 12 is used for the second stage of drilling. The second drilling device 12 is constructed as a hydraulic rotary drilling rig. The hydraulic rotary drilling rig has a greater drilling depth, wider adaptability, and higher hole quality. After the first stage of drilling is completed, the first drilling device 11 drills to a certain depth, and then works with the second drilling device 12 to drill deeper. The first drilling device 11 and the second drilling device 12 work together, alternately drilling the same pile foundation, ensuring hole formation efficiency and hole quality, improving construction efficiency, and shortening the construction period.

[0043] This application involves setting up a first drilling device 11 and a second drilling device 12 on a drilling platform to work alternately. The first drilling device 11 and the second drilling device 12 alternately drill the same pile foundation on the drilling platform, which ensures the drilling depth and hole quality, improves construction efficiency, shortens the construction period, and reduces the cost of bridge construction.

[0044] The drilling platform can be constructed in multiple ways, with each drilling platform equipped with a first drilling device 11 and a second drilling device 12 to drill holes alternately, ensuring construction efficiency and hole quality.

[0045] According to one embodiment of the present invention, the construction platform 1 further includes a first drill bit, which is disposed on the first drilling device 11. A wire brush is detachably disposed on the outer periphery of the first drill bit, and the wire brush is adapted to clean the mud on the inner wall of the borehole casing during the movement of the first drill bit.

[0046] Specifically, a first drill bit is installed on the first drilling device 11. The first drill bit advances slowly with a large pump volume during the drilling process. By installing a wire brush on the outer periphery of the first drill bit, the mud in the borehole is cleaned, which helps to produce high-quality mud in the casing to meet the construction requirements of the soil layer and the hole quality requirements. In addition, the wire brush is detachably installed on the first drill bit, which facilitates the maintenance and replacement of the wire brush and reduces maintenance costs.

[0047] According to one embodiment of the present invention, the construction platform 1 further includes an electromagnet, which is disposed on the drilling platform and adapted to extend into the borehole casing and remove metal debris inside the borehole casing.

[0048] Specifically, before drilling begins, an electromagnet is used to sweep and attract the inside of the casing. The electromagnet extends into the casing to remove metal debris, preventing iron pieces or other metal debris from falling into the casing and causing difficulties in subsequent drilling. This reduces drilling difficulty and improves hole formation efficiency and quality.

[0049] According to one embodiment of the present invention, the drilling platform includes pipe piles 13, a horizontal connecting structure 14, and a bridge deck 15. The pipe piles 13 are constructed in multiple ways, and each pipe pile 13 is supported on the bottom of the riverbed. The horizontal connecting structure 14 connects two adjacent pipe piles 13. The bridge deck 15 covers the top of the pipe piles 13, and the top of the bridge deck 15 forms a working surface suitable for carrying the first drilling device 11 and the second drilling device 12.

[0050] Specifically, multiple pipe piles 13 are supported on the bottom of the riverbed and support the bridge deck 15. The material of the pipe piles 13 can be steel to improve the support stability of the bridge deck 15. A horizontal connecting structure 14 is set between two adjacent pipe piles 13 to ensure the connection between the two adjacent pipe piles 13 and to prevent the pipe piles 13 from tilting. The bridge deck 15 is set on the top of the pipe piles 13, forming a working surface on the bridge deck 15. The first drilling device 11 and the second drilling device 12 can carry out construction on the drilling plane.

[0051] Among them, the flat-connection structure 14 can be cut according to the actual pile spacing at the construction site, and transported to the position of the pipe pile 13 by flatbed truck, where it is installed by tracked vehicles and manual labor, making assembly simple.

[0052] According to one embodiment of the present invention, the drilling platform further includes a diagonal brace 16, one end of which is connected to the pipe pile 13 or the horizontal coupling device, and the other end of which is supported on the bridge deck 15. The extension direction of the diagonal brace 16 intersects with the extension direction of the pipe pile 13.

[0053] Specifically, one end of the diagonal brace 16 is connected to the pipe pile 13 or the horizontal bracing structure 14, and the other end of the diagonal brace 16 is connected to the bridge deck 15 to ensure the stable installation of the pipe pile 13 and prevent the pipe pile 13 from tilting. The diagonal brace 16 and the horizontal bracing structure 14 are integrated into one piece through welding and connected to the pipe pile 13, simplifying the assembly process and improving the assembly efficiency.

[0054] The following is a brief description of the construction method for the construction platform 1 according to the present invention.

[0055] The construction method according to the present invention includes:

[0056] Build a drilling platform;

[0057] The first drilling device 11 performs the first stage of drilling operation on the pile foundation;

[0058] The second drilling device 12 performs a second drilling operation on the pile foundation, and the second drilling depth is greater than the first drilling depth.

[0059] The construction method of this application first involves setting up a drilling platform at the construction site. The first drilling device 11 and the second drilling device 12 can alternately drill holes on the drilling platform, providing a good construction environment for the first drilling device 11 and the second drilling device 12, which is conducive to improving drilling efficiency. The first drilling device 11 performs the first stage of drilling on the foundation pile. After drilling to a certain depth, the first drilling device 11 is withdrawn, and the second drilling device 12 is used to continue drilling. Compared with the first drilling device 11, the second drilling device 12 has a deeper drilling depth, wider geological adaptability, and higher hole quality. The first drilling device 11 and the second drilling device 12 are used alternately to ensure drilling depth, drilling efficiency, and hole quality, which helps to shorten the drilling period and reduce construction costs.

[0060] According to one embodiment of the present invention, the construction method further includes:

[0061] Before the first drilling device 11 performs the first drilling operation on the pile foundation, the inside of the pile foundation casing is cleaned and iron impurities inside the casing are removed.

[0062] Specifically, before drilling begins, an electromagnet is used to sweep and suction the inside of the casing to remove iron debris from the hole, preventing iron pieces or other debris from falling into the casing and causing difficulties in subsequent drilling, thus reducing construction difficulty and improving drilling efficiency.

[0063] According to one embodiment of the present invention, the first drilling device 11 performs a first stage of drilling operation on the pile foundation, including:

[0064] The first drilling device 11 is equipped with a drill bit with a wire brush and uses a first rotation speed to drill the upper section of the first drilling section at the first rotation speed.

[0065] The first drilling device 11 performs drilling operations on the lower section of the first drilling section using the second rotation speed; wherein

[0066] The first speed is greater than the second speed.

[0067] Specifically, when the first drilling device 11 drills the upper part of the first borehole, it should use a high speed, large pump volume, and slow advance method. This will ensure that the mud on the inner wall is cleaned and will also help to produce high-quality mud in the casing to meet the construction needs of coarse sand and gravel layers, thus meeting the requirements for borehole quality. When the first drilling device 11 drills the lower part of the first borehole, it should use a slow speed and reduce the advance rate to avoid disturbing the soil at the bottom of the casing and ensure that there is no grout leakage at the bottom, thus ensuring the stability of the casing.

[0068] According to one embodiment of the present invention, the second drilling operation includes:

[0069] The hydraulic rotary drilling rig performs relay drilling on the hole completed by the first drilling device 11 and drills into the gravel layer to increase the viscosity of the mud.

[0070] Specifically, when the hydraulic rotary drilling rig takes over the drilling operation from the first drilling device 11, the hydraulic rotary drilling rig should appropriately increase the specific gravity and viscosity of the mud when drilling through the gravel layer. At the same time, it should remove sand in time, reduce the sand content, ensure slow and slow progress, replenish and replace mud, improve the stability of the wall, and avoid adverse situations such as hole collapse, diameter reduction, and mud leakage.

[0071] According to one embodiment of the present invention, after the second drilling device 12 completes the second stage of drilling, it further includes:

[0072] The second drilling device 12 is set up to use the drilling rig air lift method to replace the high-concentration mud in the hole with freshly mixed mud.

[0073] Specifically, after the second drilling device 12 completes the second stage of drilling, the borehole should be cleaned promptly after drilling is completed. The drilling rig should use an air-lift method to automatically replace the high-concentration mud in the borehole with freshly mixed mud, ensuring that the mud's specific gravity, viscosity, and sand content meet the requirements. During cleaning, the drill string should be lifted approximately 30-50 cm from the bottom of the borehole, and the drill string should be slowly rotated to replenish high-quality mud, performing reverse circulation cleaning while maintaining the water head in the borehole to prevent borehole collapse.

[0074] During the drilling process with a hydraulic rotary drilling rig, attention should be paid to the drilling progress. If the progress slows down significantly or the slurry return becomes difficult, drilling should be stopped, and the drill bit should be checked for damage or jamming. If necessary, it should be dealt with promptly. When geological conditions change frequently and the boundaries between layers are irregular, the drilling speed should be controlled to prevent the occurrence of inclined holes. Therefore, the horizontal and verticality of the hydraulic rotary drilling rig must be adjusted in a timely manner to ensure the verticality of the borehole. Jamming is prone to occur at the junction of clay and sand layers. Therefore, the drill bit should be repeatedly lifted and cleaned according to the actual situation, while advancing slowly at low speed, replenishing and replacing slurry to improve the stability of the wall and avoid adverse situations such as hole collapse, diameter reduction, and slurry leakage. The water head height of the hydraulic rotary drilling rig must be maintained so that the water level inside the casing is 2-3m higher than the water level outside the hole. When adding drill rods, stop drilling first, lift the drill bit 0.3-0.5m away from the bottom of the hole, maintain mud circulation for more than 5 minutes to remove sediment at the bottom of the hole and carry out the drill cuttings in the pipeline, and then add drill rods. When adding drill rods, the drill rod connecting bolts should be tightened firmly. The first 10 drill rod connecting bolts must use double nuts. Carefully check the sealing rings to prevent water and air leakage at the drill rod joints, which would prevent the reverse circulation from working properly. The raising and lowering of the drill bit should be smooth, especially when the drill bit is at the bottom of the casing. Care must be taken to prevent the drill bit from hooking the casing and damaging the bottom of the hole wall. During drilling, regularly inspect the drill bit and drill rod to prevent accidents caused by loose bolts or severe drill bit wear. Ensure the safety of the borehole opening during drilling; no iron objects should fall into the hole to guarantee smooth drilling operations. Drilling should be continuous. Complete detailed, truthful, and accurate drilling records, and promptly report and handle any abnormalities discovered during drilling.

[0075] After drilling by the second drilling device 12 is completed, the borehole should be inspected. This inspection uses an ultrasonic borehole detector. The detector utilizes the principle of ultrasonic reflection detection, lowering an ultrasonic sensor along the center of the mud-filled borehole at a certain speed. During the descent, it receives and records ultrasonic pulse reflection signals perpendicular to the borehole wall in four directions. This allows for accurate simultaneous monitoring of the borehole wall condition in four directions, providing direct observation of parameters such as borehole diameter, verticality, and borehole wall condition. This completes the borehole construction for the cast-in-place pile.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0077] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0078] In the description of this invention, "a plurality of" means two or more.

[0079] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0080] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A construction platform, characterized in that, include: Drilling platform; A first drilling device and a second drilling device are respectively installed on the drilling platform; in The first drilling device is provided with a movable base, and the first drilling device is movably mounted on the drilling platform to be suitable for the first section of drilling operation on the first section of the pile foundation; The second drilling device is a hydraulic rotary drilling rig, which is suitable for performing a second stage of drilling on the pile foundation. The first drilling device and the second drilling device alternately drill the same pile foundation. The first drilling device is a crawler rotary drilling rig. A first drill bit is disposed on the first drilling device. A wire brush is detachably provided on the outer periphery of the first drill bit. The wire brush is adapted to clean the mud on the inner wall of the drilling casing during the movement of the first drill bit. An electromagnet, which is disposed on the drilling platform and adapted to extend into the borehole casing and remove metal debris from the borehole casing; The drilling platform includes: pipe piles, wherein the pipe piles are constructed in multiple ways, and each pipe pile is supported on the bottom of the riverbed; A horizontal connecting structure that connects two adjacent pipe piles; a bridge deck that covers the top of the pipe piles and has a working surface on the top of the bridge deck suitable for supporting the first drilling device and the second drilling device; The first drilling device performs a first-stage drilling operation on the pile foundation, comprising: the first drilling device is equipped with a drill bit with a wire brush and performs drilling operation on the upper section of the first-stage drilling at a first rotational speed; the first drilling device performs drilling operation on the lower section of the first-stage drilling at a second rotational speed; wherein, the first rotational speed is greater than the second rotational speed.

2. The construction platform according to claim 1, characterized in that, The drilling platform also includes: A diagonal brace, one end of which is connected to the pipe pile or the horizontal bracing structure, and the other end of which is supported on the bridge deck. The extension direction of the diagonal brace intersects with the extension direction of the pipe pile.

3. A construction method for the construction platform described in claim 1 or 2, characterized in that, include: Build a drilling platform; The first drilling device performs the first stage of drilling operations on the pile foundation; The second drilling device performs a second drilling operation on the pile foundation, and the depth of the second drilling is greater than that of the first drilling.

4. The construction method of the construction platform according to claim 3, characterized in that, Also includes: Before the first drilling operation is carried out on the pile foundation by the first drilling device, the inside of the pile foundation casing is cleaned and iron impurities inside the casing are removed.

5. The construction method of the construction platform according to claim 3, characterized in that, The second stage of drilling operations includes: The hydraulic rotary drilling rig performs relay drilling on the hole completed by the first drilling device and increases the viscosity of the mud by drilling into the gravel layer.

6. The construction method of the construction platform according to claim 3, characterized in that, After the second drilling device completes the second stage of drilling, the following is also included: The second drilling device uses the drilling rig air lift method to replace the high-concentration mud in the hole with freshly mixed mud.

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