Construction method of circulating separation type mud pit for bridge pile foundation drilling

Abstract

The invention discloses a construction method of a circulating separation type mud pit for bridge pile foundation drilling. The construction method comprises the steps that a, construction preparation is conducted, specifically, the position of a bridge pile is familiar before construction; the mud pool is divided into three functional areas, namely a slurry pool, a sedimentation pool and a slag removal pool; the sedimentation tank is divided into a first sedimentation tank and a second sedimentation tank, the first sedimentation tank and the second sedimentation tank are arranged at the two ends of the slurry tank respectively, the middle position of the tank wall of the slurry tank is communicated with the first sedimentation tank and the second sedimentation tank through slurry passing holes respectively, and the slurry passing holes are provided with flashboards. The sedimentation tank I and the sedimentation tank II are respectively and correspondingly communicated with a slag removal tank through an overflow port, and the tank bottoms of the slag removal tanks are communicated with the corresponding sedimentation tank I and sedimentation tank II through permeable pipes. And b, measuring and setting out. And c, the foundation pit is excavated. And d, bricking partition walls and renovating side slopes. And e, mounting the permeable pipe. And f, pilot running and slurry preparation. According to the construction method, mud preparation and supply and drilling slag separation are integrated in the mud pool, and a plurality of pile foundations can be used together.

Description

Technical Field

[0001] The invention relates to the technical field of bridge pile foundation construction, in particular to a construction method of a circulating separation mud pool for bridge pile foundation drilling. Background Art

[0002] In the process of bridge construction, in order to increase the structural strength of the bridge pile body, it is usually necessary to drill wells in the foundation and place pile foundations in the wells to improve the structural strength of the pile body. Drilling mud is required for the construction of bridge pile foundations. Drilling mud, drilling fluid, commonly known as mud, plays a very important role in drilling operations. Mud has many functions, mainly carrying rock cuttings from the bottom of the hole to the ground. In addition, mud also plays the role of drilling wall protection, penetrating into the stratum on the borehole wall to a certain range and adhering to the particles. Through this adhesion, the collapse and water seepage of the borehole wall can be reduced.

[0003] The role of the mud pool is to provide space for the circulation of mud. In the mud pool, the mud will settle and filter the drill cuttings brought out from the borehole. On the other hand, the mud will be temporarily stored and provided to the mud pump to pump new mud into the borehole for circulation. In the traditional construction method, the setting of the mud pool is generally based on the site conditions. A square mud pool excavated on the original ground or brick-built or filled with large steel barrels is used to circulate the drilling fluid. The general mud pool includes a sedimentation tank and a circulation tank, and the sedimentation tank and the circulation tank are connected to each other. After the mud circulates through the mud pool, the soil residue and drill cuttings carried in the mud need to be filtered and precipitated in the pool to keep the density of the mud within a certain value and keep the system running stably. In order to maintain the density of the mud, the mud pool needs to be cleaned after a period of use. If the mud pool cannot be cleaned in time, the pH value is low, the sand content is high, and the suspension capacity is poor, which will directly lead to a pile hole that has just been bored, causing a series of problems. Therefore, the traditional mud pool is usually arranged beside the construction pile foundation, and is only used for the pile foundation under construction and the adjacent pile foundation. The utilization rate of the mud pool is low. Generally, multiple mud pools are required for each span of the bridge pile foundation to meet the construction needs, and it is inconvenient to use the same mud pool for the punching and pouring construction of multiple piles. In view of this, it is necessary to design a new circulating separation mud pool for bridge pile foundation drilling. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method of a circulating separation mud pool for bridge pile foundation drilling. The construction method of the circulating separation mud pool for bridge pile foundation drilling divides the mud pool into three functional areas: a slurry pool, a sedimentation pool and a slag removal pool. It integrates mud preparation, supply and drilling slag separation into one, can be used by multiple pile foundations, and reduces the damage to the surrounding environment caused by the excavation and use of the mud pool.

[0005] The present invention is achieved by adopting the following technical solutions: A construction method of a circulating separation mud pool for bridge pile foundation drilling comprises the following steps: a. Construction preparation: Before construction, the bridge construction drawings should be studied first, and the bridge pile positions should be familiarized; the technical explanation of the improved mud pool should be carried out, and the details of the mud pool construction process should be familiarized; the required materials such as hard permeable pipes and cement bricks should be purchased and transported to the construction site. Four connections and one leveling, namely water, access, electricity, communication and site leveling, people, materials and machines are ready; and the surveying engineer shall measure and lay out according to the drawings. The sedimentation tank is divided into No. 1 sedimentation tank and No. 2 sedimentation tank. The No. 1 sedimentation tank and the No. 2 sedimentation tank are respectively arranged at the two ends of the slurry tank. The middle part of the wall of the slurry tank is connected with the No. 1 sedimentation tank and the No. 2 sedimentation tank through the slurry hole. The slurry hole is provided with a gate for opening and closing the slurry hole. The No. 1 sedimentation tank and the No. 2 sedimentation tank are respectively connected with a slag cleaning tank through the overflow port. The overflow port is located higher than the position of the slurry hole. The bottom of the slag cleaning tank is also connected with the corresponding No. 1 sedimentation tank and the No. 2 sedimentation tank through the permeable pipe.

[0006] b. Surveying and staking out: Before starting construction, surveying personnel will first stake out and measure the elevation of the bridge piles, draw the pile position range, drive control piles and reference piles, and then lay out the direction of the mud pool to accurately determine the excavation direction of the foundation pit; after confirming that the plane position of the mud pool is reasonable and correct, use white lime to mark the excavation edge line of the mud pool foundation pit.

[0007] c. Excavation of foundation pit: The excavation of mud pit is carried out according to the principle of mechanical excavation first and manual finishing later. During excavation, a level is used to monitor the elevation of the excavation surface and control the elevation to prevent over-excavation. When the excavation is about 20 to 30 cm away from the design elevation, manual finishing is used to reach the design elevation. The excavation depth of the foundation pit is 2m, and the slope of the foundation pit is 1:0.5.

[0008] d. Brick partition walls and slope repair: After the foundation pit is mechanically excavated, the excavated slopes are manually repaired to accurately locate the positions of the mud pool and slag pool. Manual excavation and repair are carried out, cement brick masonry is carried out, and appropriate surface waterproofing is carried out.

[0009] e. Installation of permeable pipes: Install hard permeable pipes when laying cement bricks.

[0010] f. Trial operation, mud preparation: After the mud pool is built, submersible pumps and mud making machines are installed. Clay or bentonite, water and other slurry making materials are added to the mud pool to make mud, and the working performance of the mud pool is checked.

[0011] Further preferred: the slag cleaning pools are respectively arranged at the ends away from the slurry pool in the No. 1 sedimentation tank and the No. 2 sedimentation tank, and the permeable pipes are divided into transverse permeable pipes and longitudinal permeable pipes. The transverse permeable pipes connect the two sides of the slag cleaning pool with the sedimentation tanks, and the longitudinal permeable pipes connect the slag cleaning pool with the opposite side of the slurry pool and the sedimentation tanks.

[0012] Further preferably, the longitudinal water-permeable pipe is connected to a vertical water-permeable pipe.

[0013] Further preferably, the upper end of the slag cleaning pool is connected to a drainage channel, and excess clean water is discharged through the drainage channel.

[0014] Further preferably, the No. 1 sedimentation tank and the No. 2 sedimentation tank are both configured as I-shaped structures.

[0015] Further preferably, the four ends on both sides of the No. 1 sedimentation tank and the No. 2 sedimentation tank are respectively connected to the adjacent pile foundation holes through return channels.

[0016] The construction method of the circulating separation mud pool for bridge pile foundation drilling integrates mud preparation, supply and drilling slag separation through the improved mud pool design, so that drilling slag is separated from mud. When the traditional circulating mud pool is full of sediment, it needs to stop work to clear the slag and make slurry, which will greatly affect the construction efficiency, easily cause the construction progress to be delayed, and increase the construction cost. The invention adds an intermediate turnover slurry pool, which can play a role in further sedimentation of mud, ensure that the turnover mud meets the design requirements, and can be directly used as mud wall protection. When the mud in the sedimentation tank on one side is insufficient or the concentration does not meet the requirements, the mud that meets the design can be circulated through the slurry hole, avoiding the process of stopping work to clear the slag and make slurry, and saving the time of pile foundation construction. The invention has improved the recycling rate of mud, reduced the amount of drilling slag to be transported, protected the environment, accelerated the progress of pile foundation construction, maintained the cleanliness of the construction site, and embodied the concept of green construction site. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the layout structure of the mud pool; Figure 2 yes Figure 1 AA section diagram in; Figure 3 yes Figure 1 BB cross-section diagram in FIG. Figure 4 yes Figure 1 Schematic diagram of CC section in; Figure 5 It is a construction process flow chart; The names corresponding to the numbers in the figure are: 1. Pile foundation hole; 2. Return channel; 3. Sedimentation tank No. 1; 4. Drainage channel; 5. Horizontal permeable pipe; 6. Longitudinal permeable pipe; 7. Overflow port; 8. Slag cleaning tank; 9. Vertical permeable pipe; 10. Slurry tank; 11. Slurry hole; 12. Gate; 13. Sedimentation tank No. 2. DETAILED DESCRIPTION

[0018] The technical solutions in the invention are clearly and completely described below in conjunction with the embodiments. The described embodiments are only a part of the present invention, rather than all the embodiments. Example

[0019] A construction method of a circulating separation mud pool for bridge pile foundation drilling, the construction steps are: a. Construction preparation: Before construction, the bridge construction drawings should be studied first, and the bridge pile positions should be familiarized; the technical explanation of the improved mud pool should be carried out, and the details of the mud pool construction process should be familiarized; the mud pool should be divided into three functional areas: slurry pool 10, sedimentation pool and slag removal pool 8; the sedimentation pool is divided into No. 1 sedimentation pool 3 and No. 2 sedimentation pool 13, which are respectively arranged at the two ends of the slurry pool 10, and the middle part of the pool wall of the slurry pool 10 is connected with No. 1 sedimentation pool 3 and No. 2 sedimentation pool 13 through slurry holes 11, respectively, and the slurry holes 11 are provided with gates 12 for opening and closing the slurry holes 11, and No. 1 sedimentation pool 3 and No. 2 sedimentation pool 13 are respectively connected with a slag removal pool 8 through overflow ports 7, and the position of the overflow ports 7 is higher than the position of the slurry holes 11, and the bottom of the slag removal pool 8 is also connected with the corresponding No. 1 sedimentation pool 3 and No. 2 sedimentation pool 13 through permeable pipes. And purchase the required materials such as hard permeable pipes and cement bricks and transport them to the construction site. Four connections and one leveling, namely, water, roads, electricity, communications and site leveling, people, materials and machinery are ready; and the surveying engineer will carry out measurement and layout according to the drawings.

[0020] b. Surveying and setting out: Before starting construction, surveyors will first set out and measure the height of the bridge piles, draw the pile range, drive control piles and reference piles, and then set out the direction of the mud pool to accurately determine the excavation direction of the foundation pit. After confirming that the plane position of the mud pool is reasonable and correct, use white lime to spread the excavation edge of the mud pool foundation pit.

[0021] c. Excavation of foundation pit: The excavation of the mud pit is carried out according to the principle of mechanical excavation first and manual trimming later. During excavation, a level is used at any time to monitor the elevation of the excavation surface to prevent over-excavation. When the excavation is about 20 to 30 cm away from the design elevation, manual trimming is used to the design elevation. The size of the mud pit is 5m×2m, the size of the slag cleaning pool is 2m×2m, and the size of the sedimentation tank is about 14m×11m. The excavation depth of the foundation pit is 2m, and the slope of the foundation pit is 1:0.5.

[0022] d. Brick partition walls and slope repair: After the foundation pit is mechanically excavated, the excavated slopes are manually repaired to accurately locate the positions of the mud pool and slag pool. Manual excavation and repair are carried out, cement brick masonry is carried out, and appropriate surface waterproofing is carried out.

[0023] e. Installation of permeable pipes: Install rigid permeable pipes during cement brick laying. The project uses 3m standard section rigid permeable pipes. 6m and 9m long rigid permeable pipes are connected by straight and tee connections. The 3m rigid permeable pipe can be cut into two sections of 1.5m rigid permeable pipes.

[0024] f. Trial operation, mud preparation: After the mud pool is built, submersible pumps and mud making machines are installed. Clay or bentonite, water and other slurry making materials are added to the mud pool to make mud, and the working performance of the mud pool is checked.

[0025] The slag cleaning pool 8 is respectively arranged at the end away from the slurry pool 10 in the No. 1 sedimentation pool 3 and the No. 2 sedimentation pool 13. The permeable pipe is divided into a transverse permeable pipe 5 and a longitudinal permeable pipe 6. The transverse permeable pipe 5 connects the two sides of the slag cleaning pool 8 with the sedimentation pool, and the longitudinal permeable pipe 6 connects the slag cleaning pool 8 with the opposite side of the slurry pool 10 and the sedimentation pool.

[0026] The longitudinal water-permeable pipe 6 is connected to a vertical water-permeable pipe 9 .

[0027] The upper end of the slag cleaning pool 8 is connected to a drainage channel 4, through which excess clean water is discharged.

[0028] The first sedimentation tank 3 and the second sedimentation tank 13 are both configured as I-shaped structures. The four ends of the first sedimentation tank 3 and the second sedimentation tank 13 on both sides are connected to the adjacent pile foundation holes 1 through the return channels 2 respectively.

[0029] When the circulating separation mud pool for drilling the bridge pile foundation obtained by the construction begins to be used: first use the sedimentation tank to make slurry, place the mud pump in a corner of the sedimentation tank to make slurry, and the mud replaced by punching is discharged into the sedimentation tank. This step is consistent with the use of conventional mud pools. Due to natural infiltration and the need to meet the minimum water level requirements, pay attention to adding clean water to the slag removal pool while punching. When the mud depth in the pool is greater than 1.2 meters, it can enter the normal use stage. When the mud level in the sedimentation tank reaches the elevation of the slurry hole of the slurry pool, open the gate plate, and the mud can flow into the slurry pool. Then transfer the mud pump from the sedimentation tank to the slurry pool, and the mud replaced by the pile foundation hole is discharged into the sedimentation tank. The mud replaced from the pile hole to the sedimentation tank is returned to the slurry pool for use after sedimentation (after sedimentation in the sedimentation tank, three layers of sediment, mud and water will appear in the pool from low to high, and the mud will flow into the slurry pool through the slurry hole). At this stage, clean water should still be added to the sedimentation tank in time to offset the water loss due to natural infiltration. When cleaning the hole, water can be directly pumped from the slag cleaning tank to the pile foundation hole for cleaning, and the slurry can be directly discharged into the sedimentation tank for circulating flushing. When sedimentation tank No. 1 is full and needs to be discharged, water can be directly pumped from the slag cleaning tank of sedimentation tank No. 1 to sedimentation tank No. 2 to achieve the purpose of water-slag separation and reuse of mud and water in the tank; finally, excavators and slag transport trucks can be used to discharge and transport slag from sedimentation tank No. 1. Instructions for use when one pile is cleaning the hole and the other pile is punching at the same time: The slurry discharge for cleaning and punching is directly discharged into the sedimentation tank. The difference is that water is directly pumped from the slag cleaning tank for cleaning the hole, while slurry is directly taken from the slurry tank for punching, and each takes what it needs without interfering with each other.

[0030] The above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A construction method of a circulating separation mud pool for bridge pile foundation drilling, characterized in that: The following steps are involved: a. Construction preparation: Familiarize yourself with the bridge pile position before construction; divide the slurry pool into three functional areas: a slurry pool (10), a sedimentation pool, and a slag removal pool (8); the sedimentation pool is divided into a No. 1 sedimentation pool (3) and a No. 2 sedimentation pool (13); the No. 1 sedimentation pool (3) and the No. 2 sedimentation pool (13) are respectively arranged at the two ends of the slurry pool (10); the middle part of the pool wall of the slurry pool (10) is connected to the No. 1 sedimentation pool (3) and the No. 2 sedimentation pool (13) through a slurry hole (11); the slurry hole (11) is provided with a gate (12) for opening and closing the slurry hole (11); the No. 1 sedimentation pool (3) and the No. 2 sedimentation pool (13) are respectively connected to a slag removal pool (8) through an overflow port (7); the overflow port (7) is located higher than the position of the slurry hole (11); the bottom of the slag removal pool (8) is also connected to the corresponding No. 1 sedimentation pool (3) and the No. 2 sedimentation pool (13) through a permeable pipe; b. Surveying and staking out: Surveyors will stake out and measure the height of the bridge piles, determine the location of the mud pool, and use lime to mark the excavation boundary of the mud pool foundation pit; c. Excavation of foundation pit: The excavation of the mud pit is carried out according to the principle of mechanical excavation first and manual finishing later; the elevation of the excavation surface is controlled during excavation, and when the excavation is about 20 to 30 cm away from the design elevation, manual finishing is used to reach the design elevation; d. Brick partition walls and slope repair: After the foundation pit is mechanically excavated, the excavated slopes are manually repaired to accurately locate the positions of the mud pool and slag pool; cement brick masonry and waterproofing are carried out; e. Installation of water-permeable pipes: Install hard water-permeable pipes during cement brick laying; f. Trial operation, mud preparation: After the mud pool is constructed, the submersible pump and the slurry making machine are installed; slurry making materials are added to make mud, and the working performance of the mud pool is checked.

2. The construction method of the circulating separation mud pool for bridge pile foundation drilling according to claim 1 is characterized by: The slag cleaning pool (8) is respectively arranged at the end away from the slurry pool (10) in the No. 1 sedimentation pool (3) and the No. 2 sedimentation pool (13), and the water permeable pipe is divided into a transverse water permeable pipe (5) and a longitudinal water permeable pipe (6). The transverse water permeable pipe (5) connects the two sides of the slag cleaning pool (8) with the sedimentation pool, and the longitudinal water permeable pipe (6) connects the opposite side of the slag cleaning pool (8) and the slurry pool (10) with the sedimentation pool.

3. The construction method of the circulating separation mud pool for bridge pile foundation drilling according to claim 2 is characterized by: The longitudinal water-permeable pipe (6) is connected to a vertical water-permeable pipe (9).

4. The construction method of a circulating separation mud pool for bridge pile foundation drilling according to claim 1 or 2, characterized in that: The upper end of the slag cleaning pool (8) is connected to a drainage channel (4).

5. The construction method of the circulating separation mud pool for bridge pile foundation drilling according to claim 1 is characterized in that: The No. 1 sedimentation tank (3) and the No. 2 sedimentation tank (13) are both configured as I-shaped structures.

6. The construction method of the circulating separation mud pool for bridge pile foundation drilling according to claim 5 is characterized in that: The four ends on both sides of the No. 1 sedimentation tank (3) and the No. 2 sedimentation tank (13) are respectively connected to the adjacent pile foundation holes (1) through the return channels (2).

Images