CN110318661B

CN110318661B - Dewatering well construction method

Info

Publication number: CN110318661B
Application number: CN201910334877.7A
Authority: CN
Inventors: 李智; 廖红玉; 钟卫斌; 孙仕斌; 刘明周; 夏颖; 金锋; 杨济滔
Original assignee: Wuhan Yiye Construction Engineering Co ltd
Current assignee: Wuhan Yiye Construction Engineering Co ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2021-03-30
Anticipated expiration: 2039-04-24
Also published as: CN110318661A

Abstract

The invention discloses a construction method of a dewatering well, wherein an air compressor supplies energy to a drilling machine, a pressure beater is installed on the drilling machine, a hammer head is fixedly installed at the bottom end of a connecting rod, a material filtering hole is formed along a dewatering pipe, a reinforcing ring is fixedly installed at the bottom end, the outer diameter of the hammer head is slightly smaller than the inner diameter of the dewatering pipe and slightly larger than the inner diameter of the reinforcing ring, the connecting rod and the hammer head are inserted into the dewatering pipe, then the top end of the connecting rod is fixedly installed with the pressure beater, the drilling machine drives a hammer head seal to press on the reinforcing ring and move downwards through the pressure beater and the connecting rod, the dewatering pipe synchronously sinks along with the reinforcing ring, the connecting rod and the hammer head are moved away after the dewatering pipe sinks in place, underground water flows into the dewatering pipe under the siphon action to complete well washing, a water pump. The method has low construction difficulty, reduces construction procedures, saves construction period and materials, and avoids hole collapse.

Description

Dewatering well construction method

Technical Field

The invention belongs to the field of municipal engineering construction, and particularly relates to a dewatering well construction method.

Technical Field

In municipal works, when the deep foundation pit is constructed, the construction needs to be assisted by a dewatering well. When the existing dewatering well is constructed, the point position is circularly drilled, then a slurry protective wall is adopted, pipe processing is simultaneously carried out, a steel wire mesh and a nylon mesh are wound around the pipe, after the drilling is successful, the pipe is placed into a hole, then the well is washed, then reverse filter materials are backfilled on two sides of the pipe, and finally the dewatering well is operated. At present, the construction of the dewatering well needs to arrange steel wire meshes and nylon meshes around pipes, and the two sides of the pipes need to be backfilled with filter materials, so that the process is complex, the working procedures are complex, the construction efficiency is low, the effect is poor, and if construction waste occurs in the stratum, the circular drilling is difficult to construct, and the hole collapse phenomenon is easily caused.

Disclosure of Invention

The invention aims to provide a dewatering well construction method which is low in construction difficulty, reduces construction procedures, saves construction period and materials and avoids hole collapse.

The technical scheme adopted by the invention is as follows:

a construction method of a dewatering well comprises the following steps:

s1, positioning the dewatering well, and conveying an air compressor, a drilling machine, a pressure applying device, a connecting rod, a hammer head and a dewatering pipe to the position of the dewatering well, wherein the air compressor supplies energy to the drilling machine, the pressure applying device is installed on the drilling machine, the hammer head is fixedly installed at the bottom end of the connecting rod, a filter material hole is formed along the dewatering pipe, a reinforcing ring is fixedly installed at the bottom end, and the outer diameter of the hammer head is slightly smaller than the inner diameter of the dewatering pipe and slightly larger;

s2, inserting the connecting rod and the hammer head into the precipitation pipe, and then fixedly installing the top end of the connecting rod and the pressurizer;

s3, starting the air compressor, driving the hammer head to seal and press the reinforcing ring and move downwards by the drilling machine through the pressuring machine and the connecting rod, and enabling the downcomer to sink synchronously with the reinforcing ring;

s4, after the downcomer sinks to the right position, the connecting rod and the hammer are removed, and underground water flows into the downcomer under the siphon action so as to complete well washing;

s5, placing a water pump in the precipitation pipe, and leading the underground water in the precipitation pipe to the outside of the precipitation well through a drain pipe by the water pump;

and S6, after the foundation pit construction is finished, pulling out the downcomer for recovery.

Furthermore, the reinforcing ring is welded at the bottom end of the downcomer, and two ends of the connecting rod are respectively in threaded connection with the hammer head and the pressure device.

Furthermore, the thickness of the reinforcing ring is 5-10mm, the height of the reinforcing ring is 4-6cm, and the outer diameter of the hammer head is 5-10mm smaller than the inner diameter of the precipitation pipe.

Furthermore, the hole pitch of the filter material holes is 15-25 cm.

Further, the downcomer is pulled out through the pulling machine.

The invention has the beneficial effects that:

in the conventional method, the hole is formed firstly, then the water pipe is descended, the hole forming size is large, the construction difficulty is high, the hole forming and the water pipe descending are synchronously performed, the hole drilling size is close to that of the water pipe descending, the construction difficulty is low, the water pipe descending can conveniently penetrate through a building rubbish layer under the force of a hammer head, and hole collapse is avoided; the dewatering pipe does not need manual well washing and backfilling after being in place, a nylon net, a steel wire mesh and the like do not need to be arranged on the periphery of the pipe, the dewatering pipe can be processed in advance, and recycling and turnover can be achieved.

Drawings

FIG. 1 is a schematic diagram of the operation of an embodiment of the present invention.

Fig. 2 is a schematic view of a connecting rod and a hammer head in an embodiment of the invention.

Figure 3 is a schematic view of a downcomer in an embodiment of the present invention.

FIG. 4 is a schematic illustration of the siphoning action in an embodiment of the present invention.

FIG. 5 is a schematic diagram of the water pump draining in an embodiment of the present invention.

In the figure: 1-an air compressor; 2-a drilling machine; 3-a presser; 4-a connecting rod; 5-a downcomer pipe; 6-hammer head; 7-a reinforcement ring; 8-filtering material holes; 9-a water pump; 10-a drain pipe.

Detailed Description

The invention is further described below with reference to the figures and examples.

A construction method of a dewatering well comprises the following steps:

s1, as shown in figure 1, positioning the dewatering well, and conveying an air compressor 1, a drilling machine 2, a pressure beater 3, a connecting rod 4, a hammer head 6 and a dewatering pipe 5 to the position of the dewatering well, wherein the air compressor 1 supplies energy to the drilling machine 2, the pressure beater 3 is installed on the drilling machine 2, as shown in figure 2, the hammer head 6 is in threaded connection with the bottom end of the connecting rod 4, as shown in figure 3, a filter material hole 8 is formed along the dewatering pipe 5 (the hole distance of the filter material hole 8 is 15-25cm, preferably 20cm, and is used for preventing impurities from entering the dewatering pipe 5 while water is permeated), a reinforcing ring 7 is fixedly welded at the bottom end, the outer diameter of the hammer head 6 is slightly smaller than the inner diameter of the dewatering pipe 5 and slightly larger than the inner diameter of the reinforcing ring 7 (the thickness of the reinforcing ring 7 is 5-10mm, the height is 4-6 cm.

S2, as shown in figure 1, the connecting rod 4 and the hammer head 6 are inserted into the downcomer 5, and then the top end of the connecting rod 4 is connected with the pressure device 3 through screw threads.

S3, as shown in figure 1, starting the air compressor 1, driving the hammer 6 to seal and press the reinforcing ring 7 and move downwards by the drilling machine 2 through the pressure beater 3 and the connecting rod 4 (the pressure of the seal of the hammer 6 is on the reinforcing ring 7, so as to prevent groundwater from rushing in), and the downcomer 5 sinks synchronously along with the reinforcing ring 7.

S4, after the downcomer 5 sinks to the right position, the connecting rod 4 and the hammer head 6 are removed, and as shown in figure 4, underground water flows into the downcomer 5 under the siphon action, so that well washing is completed.

S5, as shown in fig. 5, a water pump 9 is placed in the downcomer 5, and the water pump 9 leads the groundwater in the downcomer 5 to the outside of the precipitation well through the drain pipe 10.

And S6, after the foundation pit construction is finished, pulling out the downcomer 5 through a pulling machine for recycling.

In the conventional method, the hole is formed firstly, then the water pipe 5 is descended, the hole forming size is large, the construction difficulty is high, the hole forming and the water pipe 5 descending are synchronously performed, the hole drilling size is close to the size of the water pipe 5, the construction difficulty is low, the water pipe 5 can conveniently penetrate through a building rubbish layer under the force of the hammer head 6, and the hole collapse is avoided; and need not artifical well-flushing and backfill after downcomer 5 targets in place, avoided needing to carry out well-flushing with equipment such as circulating pump among the conventional art, need not to arrange nylon wire net and wire net etc. at tubular product periphery to downcomer 5 can be processed in advance, also can retrieve the turnover, under the prerequisite of guaranteeing construction quality, has reduced construction process, has saved time limit for a project and material, has reduced engineering cost.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims

1. A construction method of a dewatering well is characterized in that: comprises the steps of (a) carrying out,

2. The dewatering well construction method as claimed in claim 1, wherein: the reinforcing ring is welded at the bottom end of the downcomer, and two ends of the connecting rod are respectively in threaded connection with the hammer head and the pressure device.

3. The dewatering well construction method as claimed in claim 1, wherein: the thickness of the reinforcing ring is 5-10mm, the height is 4-6cm, and the outer diameter of the hammer head is 5-10mm smaller than the inner diameter of the precipitation pipe.

4. The dewatering well construction method as claimed in claim 1, wherein: the hole pitch of the filter material holes is 15-25 cm.

5. The dewatering well construction method as claimed in claim 1, wherein: the downcomer is pulled out through a pulling machine.