Construction method of full pile casing bored pile in deep sand layer

Abstract

The invention discloses a construction method of a full pile casing bored pile in a deep sand layer, and relates to the technical field of building design. By changing the included angle between the first connecting plate and the second connecting plate, the use height of the whole drilling mechanism can be changed, then the hole site drilling purpose of different hole depths can be met, and when the included angle between the first connecting plate and the second connecting plate is changed, the included angle between the lower end of the first connecting plate and the bottom frame can be changed under the action of the positioning shaft; the movable seat can be pushed to move in the limiting plate, and the movable seat can be prevented from shaking in the moving process under the action of the movable shaft, so that the actual use effect can be guaranteed; the use height of the limiting plate can be changed by changing the position of the bearing piece on the circumferential surface of the positioning column, so that the purpose of height adjustment of the drilling mechanism and the adjusting mechanism can be achieved, the use requirements under different conditions can be met, practicability is high, and the application range is wide.

Description

Technical Field

[0001] The invention relates to the technical field of building design, and in particular to a construction method for a full-casing bored pile in a thick sand layer. Background Art

[0002] Bored piles are piles made by mechanically drilling, squeezing soil with steel pipes or digging with human power to form pile holes in the foundation soil, placing steel cages in the holes and pouring concrete. Due to its mature construction technology, high bearing capacity and wide application range, it has been widely used in the foundation of structural engineering such as highways, railway bridges, etc. The construction of bored piles has two methods, mud wall protection method and full casing construction method, depending on the different wall protection methods. Among them, the construction of fully-cased bored piles is to use special shaking and vibrating equipment to make the steel casing overcome the friction between the soil layers and the casing, so that the casing passes through the unfavorable strata in the pile driver drilling construction until it reaches the stable pile end bearing layer, and uses the drilling equipment to hollow out the slag in the casing to ensure the construction technology of the poured pile. This method does not use bentonite or chemical mud wall protection, does not pollute the groundwater, and keeps the construction site clean and tidy. It does not affect the normal work and life of the surrounding residents and enterprises, and meets high environmental protection requirements; at the same time, in geological conditions such as loose sand layers, fine-angle gravel layers, quicksand layers, thick silt layers, and karst landforms, it is difficult to ensure the stability of the hole wall by using mud wall protection. In this case, the full-casing construction technology is required. For this reason, we propose a construction method for fully-cased bored piles in thick sand layers. Summary of the invention

[0003] The purpose of the present invention is to solve the problems mentioned in the above background technology, and provide a construction method of full casing bored piles in thick sand layers.

[0004] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0005] A construction method for a fully-cased bored pile in a thick sand layer comprises the following steps:

[0006] Surveying, used for site measurement and planning;

[0007] Line laying and positioning, used for setting hole positions;

[0008] Drilling rig is used to drill holes;

[0009] Hole position measurement: measure the hole position. If qualified, proceed to the next step. If not qualified, return to the previous step.

[0010] Install the steel cage and place the pre-installed steel cage into the qualified hole position;

[0011] Slurry configuration and testing: configure and test the slurry according to actual usage, and store the slurry that meets the test requirements;

[0012] Grouting, using a grouting machine to inject the stored slurry into the hole where the steel cage is installed;

[0013] Maintenance: daily maintenance of the slurry inside the hole after grouting;

[0014] Strength testing: perform strength testing on the holes after grouting until they meet the construction conditions;

[0015] Use a vibratory hammer to pull out the casing; use the vibratory hammer to operate at a uniform speed to pull out the casing and complete the construction of the bored pile.

[0016] Furthermore, the surveying adopts total station surveying and layout and reasonable site planning.

[0017] Furthermore, the layout and positioning is carried out according to the design drawings, the pile positions are measured and marked, and the subsequent drilling work is carried out after the pile positions are verified to be correct.

[0018] Furthermore, the drilling rig drilling includes:

[0019] A drilling mechanism, the drilling mechanism comprising a driving machine, a drill rod mounted on the lower end of the output shaft of the driving machine, an auger mounted on the circumferential surface of the drill rod, and a fixing frame mounted on the upper end of the driving machine;

[0020] An adjustment mechanism, the adjustment mechanism comprising a connecting shaft installed inside the fixing frame, a first connecting plate and a second connecting plate connected to the fixing frame through the connecting shaft, a base frame movably installed at the lower ends of the first connecting plate and the second connecting plate through a positioning shaft, a movable seat installed at the lower end of the base frame, a limit plate movably connected to the movable seat through a movable shaft, and nuts installed on the circumferential surfaces of both ends of the connecting shaft and the movable shaft;

[0021] A transverse plate, mounted on the outer side of the fixing frame;

[0022] Support frames, two of which are detachably mounted below the horizontal plate;

[0023] A positioning column installed inside the support frame;

[0024] The supporting member is movably sleeved on the circumferential surface of the positioning column.

[0025] Furthermore, a through slot is provided inside the fixing frame, and the upper ends of the first connecting plate and the second connecting plate are installed in the through slot.

[0026] Furthermore, a mounting groove is formed at the upper end of the second connecting plate, and the upper end of the first connecting plate is mounted in the mounting groove.

[0027] Furthermore, a movable groove is opened inside the limiting plate, and the movable seat forms a movable connection with the limiting plate through the movable groove, and movable grooves with arc-shaped structures at both ends are opened on the front and back sides of the movable groove, and the movable shaft forms a movable connection with the limiting plate through the movable groove.

[0028] Furthermore, external threads are provided on the circumferential surfaces at both ends of the connecting shaft and the movable shaft, and the connecting shaft and the movable shaft are connected to the nut through threads.

[0029] Furthermore, each of the support frames is provided with an empty slot inside, and both ends of the limit plate are inserted into the empty slot.

[0030] Furthermore, a threaded connection portion is provided on the circumferential surface of the positioning column, a threaded hole is provided inside the supporting member, and the positioning column is connected to the supporting member through threads.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. The present invention can change the use height of the entire drilling mechanism by changing the angle between the first connecting plate and the second connecting plate, thereby meeting the purpose of drilling holes with different hole depths. When the angle between the first connecting plate and the second connecting plate changes, the angle between the lower end and the base frame can be changed under the action of the positioning shaft, thereby pushing the movable seat to move inside the limit plate, and under the action of the movable shaft, the movable seat can be prevented from shaking during movement, thereby ensuring the actual use effect.

[0033] 2. The present invention can ensure the movement stability of the limit plate under the action of the positioning column; it can achieve the support purpose of the limit plate under the action of the supporting member, and by changing the position of the supporting member on the circumferential surface of the positioning column, the use height of the limit plate can be changed, thereby achieving the height adjustment purpose of the drilling mechanism and the adjustment mechanism, and then can meet the use requirements under different conditions, with strong practicality and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a work flow chart of the present invention;

[0035] Figure 2 It is a schematic diagram of the main stereoscopic structure of the present invention;

[0036] Figure 3 is a front cross-sectional view of the present invention;

[0037] Figure 4 It is a three-dimensional schematic diagram of the drilling mechanism in the present invention;

[0038] Figure 5 It is a three-dimensional schematic diagram of the adjustment mechanism in the present invention;

[0039] Figure 6 It is a three-dimensional schematic diagram of the present invention without the drilling mechanism and the adjusting mechanism.

[0040] Figure numerals: 1. drilling mechanism; 101. driving machine; 102. drill rod; 103. auger; 104. fixed frame; 2. adjusting mechanism; 201. connecting shaft; 202. first connecting plate; 203. second connecting plate; 204. positioning shaft; 205. base frame; 206. movable seat; 207. movable shaft; 208. limit plate; 209. nut; 3. cross plate; 4. support frame; 5. positioning column; 6. supporting member. DETAILED DESCRIPTION

[0041] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0042] See also Figure 1 The present invention provides a construction method for a full casing bored pile in a thick sand layer, comprising the following steps:

[0043] Surveying, used for site surveying and planning, using total station surveying and setting out, and reasonable site planning;

[0044] Line laying and positioning is used to set the hole position. According to the design drawings, the pile position is measured and marked. After the pile position is verified to be correct, the subsequent drilling work is carried out;

[0045] Drilling rig is used to drill holes;

[0046] Hole position measurement: measure the hole position. If qualified, proceed to the next step. If not qualified, return to the previous step.

[0047] Install the steel cage and place the pre-installed steel cage into the qualified hole position;

[0048] Slurry configuration and testing: configure and test the slurry according to actual usage, and store the slurry that meets the test requirements;

[0049] Grouting, using a grouting machine to inject the stored slurry into the hole where the steel cage is installed;

[0050] Maintenance: daily maintenance of the slurry inside the hole after grouting;

[0051] Strength testing: perform strength testing on the holes after grouting until they meet the construction conditions;

[0052] Use a vibratory hammer to pull out the casing; use the vibratory hammer to operate at a uniform speed to pull out the casing and complete the construction of the bored pile.

[0053] See also Figure 2-6 The present invention also provides a drilling rig mechanism:

[0054] The drilling mechanism 1 includes a driving machine 101 , a drill rod 102 installed at the lower end of the output shaft of the driving machine 101 , an auger 103 installed on the circumferential surface of the drill rod 102 , and a fixing frame 104 installed at the upper end of the driving machine 101 .

[0055] The installation stability of the driving machine 101 can be guaranteed under the action of the fixing frame 104, the installation stability of the drill rod 102 can be guaranteed under the action of the driving machine 101, and the installation stability of the auger 103 can be guaranteed under the action of the drill rod 102. After starting the driving machine 101, the drill rod 102 and the auger 103 on its circumferential surface can be driven to perform circular motion, thereby achieving the purpose of drilling.

[0056] The adjusting mechanism 2 includes a connecting shaft 201 installed inside the fixing frame 104, a first connecting plate 202 and a second connecting plate 203 connected to the fixing frame 104 through the connecting shaft 201, a base frame 205 movably installed at the lower ends of the first connecting plate 202 and the second connecting plate 203 through the positioning shaft 204, a movable seat 206 installed at the lower end of the base frame 205, a limiting plate 208 movably connected to the movable seat 206 through a movable shaft 207, and a nut 209 installed on the circumferential surfaces of both ends of the connecting shaft 201 and the movable shaft 207.

[0057] Under the action of the connecting shaft 201, the connection stability between the fixing frame 104 and the first connecting plate 202 and the second connecting plate 203 can be ensured. Under the action of the positioning shaft 204, the connection stability between the first connecting plate 202 and the second connecting plate 203 and the base frame 205 can be ensured. Under the action of the movable seat 206, the support purpose of the base frame 205 can be achieved. Under the cooperation of the limiting plate 208 and the movable shaft 207, the installation stability of the movable seat 206 can be ensured. Under the action of the nut 209, the installation stability of the connecting shaft 201 and the movable shaft 207 can be achieved. By changing the angle between the first connecting plate 202 and the second connecting plate 203, the use height of the entire drilling mechanism 1 can be changed, thereby meeting the purpose of drilling holes of different hole depths. When the angle between the first connecting plate 202 and the second connecting plate 203 changes, the angle between the lower end and the base frame 205 can be changed under the action of the positioning shaft 204, thereby pushing the movable seat 206 to move inside the limit plate 208, and under the action of the movable shaft 207, the movable seat 206 can be prevented from shaking during movement, thereby ensuring the actual use effect.

[0058] The transverse plate 3 is installed on the outer side of the fixing frame 104 ; under the action of the transverse plate 3 , the installation stability of the fixing frame 104 can be ensured, and the movement stability of the first connecting plate 202 and the second connecting plate 203 can also be ensured.

[0059] The two support frames 4 are detachably installed under the transverse plate 3; under the action of the support frame 4, the support purpose of the transverse plate 3 can be achieved, and the installation stability of the limit plate 208 can also be guaranteed, and it is easy to disassemble and facilitate combined installation.

[0060] The positioning column 5 is installed inside the support frame 4; under the action of the positioning column 5, the movement stability of the limit plate 208 can be guaranteed.

[0061] The supporting member 6 is movably sleeved on the circumferential surface of the positioning column 5; under the action of the supporting member 6, the supporting purpose of the limit plate 208 can be achieved. By changing the position of the supporting member 6 on the circumferential surface of the positioning column 5, the use height of the limit plate 208 can be changed, thereby achieving the height adjustment purpose of the drilling mechanism 1 and the adjustment mechanism 2, and then being able to meet the use requirements under different conditions, with strong practicality and a wide range of applications.

[0062] In this embodiment, preferably, a through groove is opened inside the fixing frame 104, and the upper ends of the first connecting plate 202 and the second connecting plate 203 are installed in the through groove; under the action of the through groove, the installation stability of the first connecting plate 202 and the second connecting plate 203 can be guaranteed, and space can be provided for the movement of the first connecting plate 202 and the second connecting plate 203, and it also has the effect of limiting.

[0063] In this embodiment, preferably, a mounting groove is opened at the upper end of the second connecting plate 203, and the upper end of the first connecting plate 202 is installed in the mounting groove; under the action of the mounting groove, the connection stability between the first connecting plate 202 and the second connecting plate 203 can be ensured, and the angle adjustment of the first connecting plate 202 and the second connecting plate 203 can be realized.

[0064] In this embodiment, preferably, a movable groove is opened inside the limiting plate 208, and the movable seat 206 is movably connected with the limiting plate 208 through the movable groove, and movable grooves with arc-shaped structures at both ends are opened on the front and back sides of the movable groove, and the movable shaft 207 is movably connected with the limiting plate 208 through the movable groove; under the action of the movable groove, space can be provided for the movement of the movable seat 206, and it also has the effect of limiting, and under the action of the movable groove, space can be provided for the movement of the movable shaft 207, and it also has the effect of limiting.

[0065] In this embodiment, preferably, the circumferential surfaces at both ends of the connecting shaft 201 and the movable shaft 207 are provided with external threads, and the connecting shaft 201 and the movable shaft 207 are connected to the nut 209 through threads; the threaded connection can realize the disassembly of the connecting shaft 201 and the movable shaft 207 and the nut 209, which is convenient for combined installation.

[0066] In this embodiment, preferably, each support frame 4 is provided with an empty slot inside, and both ends of the limit plate 208 are inserted into the empty slot; the installation stability of both ends of the limit plate 208 can be ensured by the action of the empty slot.

[0067] In this embodiment, preferably, a threaded connection portion is provided on the circumferential surface of the positioning column 5, a threaded hole is provided inside the supporting member 6, and the positioning column 5 and the supporting member 6 are connected by threads; the height position of the supporting member 6 on the circumferential surface of the positioning column 5 can be changed through the threaded connection.

[0068] The working principle and use process of the present invention are as follows: when the device is used, after starting the driving machine 101, it can drive the drill rod 102 and the auger 103 on its circumferential surface to perform circular motion, thereby achieving the purpose of drilling holes; by changing the angle between the first connecting plate 202 and the second connecting plate 203, the use height of the entire drilling mechanism 1 can be changed, thereby meeting the purpose of drilling holes with different hole depths. When the angle between the first connecting plate 202 and the second connecting plate 203 changes, the angle between its lower end and the base frame 205 can be changed under the action of the positioning shaft 204, thereby promoting the moving seat 206 to move inside the limiting plate 208, and under the action of the movable shaft 207, the moving seat 206 can be prevented from shaking during movement, that is, the actual Usage effect: Under the action of the cross plate 3, the installation stability of the fixing frame 104 can be guaranteed, and the movement stability of the first connecting plate 202 and the second connecting plate 203 can be guaranteed; under the action of the supporting frame 4, the support purpose of the cross plate 3 can be achieved, and the installation stability of the limiting plate 208 can be guaranteed, and it is easy to disassemble and facilitate combined installation; under the action of the positioning column 5, the movement stability of the limiting plate 208 can be guaranteed; under the action of the supporting member 6, the support purpose of the limiting plate 208 can be achieved, and by changing the position of the supporting member 6 on the circumferential surface of the positioning column 5, the use height of the limiting plate 208 can be changed, so that the height adjustment purpose of the drilling mechanism 1 and the adjusting mechanism 2 can be achieved, and then it can meet the use requirements under different conditions, with strong practicality and a wide range of applications.

[0069] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction method for a fully-cased bored pile in a thick sand layer, characterized in that: The steps include: Surveying, used for site measurement and planning; Line laying and positioning, used for setting hole positions; Drilling rig is used to drill holes; Hole position measurement: measure the hole position. If qualified, proceed to the next step. If not qualified, return to the previous step. Install the steel cage and place the pre-installed steel cage into the qualified hole position; Slurry configuration and testing: configure and test the slurry according to actual usage, and store the slurry that meets the test requirements; Grouting, using a grouting machine to inject the stored slurry into the hole where the steel cage is installed; Maintenance: daily maintenance of the slurry inside the hole after grouting; Strength testing: perform strength testing on the holes after grouting until they meet the construction conditions; Use a vibratory hammer to pull out the casing; use the vibratory hammer to operate at a uniform speed to pull out the casing and complete the construction of the bored pile.

2. The construction method of a fully-cased bored pile in a thick sand layer according to claim 1, characterized in that: The measurement is carried out using a total station for surveying and setting out, and reasonable site planning.

3. The construction method of a fully-cased bored pile in a thick sand layer according to claim 1, characterized in that: The positioning is carried out according to the design drawings, the pile positions are measured and marked, and the subsequent drilling work is carried out after the pile positions are verified to be correct.

4. The construction method of a fully-cased bored pile in a thick sand layer according to claim 1 is characterized in that: The drilling rig drilling comprises: A drilling mechanism (1), the drilling mechanism (1) comprising a driving machine (101), a drill rod (102) mounted at the lower end of an output shaft of the driving machine (101), an auger (103) mounted on the circumferential surface of the drill rod (102), and a fixing frame (104) mounted at the upper end of the driving machine (101); An adjusting mechanism (2), the adjusting mechanism (2) comprising a connecting shaft (201) installed inside the fixing frame (104), a first connecting plate (202) and a second connecting plate (203) connected to the fixing frame (104) via the connecting shaft (201), a base frame (205) movably installed at the lower ends of the first connecting plate (202) and the second connecting plate (203) via a positioning shaft (204), a movable seat (206) installed at the lower end of the base frame (205), a limiting plate (208) movably connected to the movable seat (206) via a movable shaft (207), and nuts (209) installed on the circumferential surfaces of both ends of the connecting shaft (201) and the movable shaft (207); A transverse plate (3) mounted on the outer side of the fixing frame (104); Two support frames (4) are detachably mounted below the horizontal plate (3); A positioning column (5) installed inside the support frame (4); A supporting member (6) is movably sleeved on the circumferential surface of the positioning column (5).

5. The construction method of a fully-cased bored pile in a thick sand layer according to claim 4, characterized in that: A through slot is provided inside the fixing frame (104), and the upper ends of the first connecting plate (202) and the second connecting plate (203) are mounted in the through slot.

6. The construction method of a fully-cased bored pile in a thick sand layer according to claim 4, characterized in that: The upper end of the second connecting plate (203) is provided with a mounting groove, and the upper end of the first connecting plate (202) is mounted in the mounting groove.

7. The construction method of a fully-cased bored pile in a thick sand layer according to claim 4, characterized in that: A movable groove is provided inside the limiting plate (208), and the movable seat (206) is movably connected to the limiting plate (208) through the movable groove. The front and back sides of the movable groove are both provided with movable grooves with arc-shaped structures at both ends, and the movable shaft (207) is movably connected to the limiting plate (208) through the movable groove.

8. The method for constructing a fully-cased bored pile in a thick sand layer according to claim 4, characterized in that: External threads are provided on the circumferential surfaces at both ends of the connecting shaft (201) and the movable shaft (207), and the connecting shaft (201) and the movable shaft (207) are connected to the nut (209) via threads.

9. The method for constructing a fully-cased bored pile in a thick sand layer according to claim 4, characterized in that: Each of the support frames (4) is provided with an empty slot inside, and both ends of the limit plate (208) are inserted into the empty slot.

10. The construction method of a fully-cased bored pile in a thick sand layer according to claim 4, characterized in that: A threaded connection portion is provided on the circumferential surface of the positioning column (5), a threaded hole is provided inside the supporting member (6), and the positioning column (5) and the supporting member (6) are connected via threads.

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