Installation method of combined pod type earth pressure cell

Abstract

The invention discloses a combined pod type soil pressure cell installation method which comprises a sleeve, a chuck bracket, a pod, a tray, a soil pressure cell, a connecting rod, a lifting rope and a chuck hole, the chuck hole is formed in the surface of the chuck bracket, the pod and the tray are combined into a whole, the soil pressure cell is arranged in the pod, and the connecting rod is connected with the connecting rod. The nacelle is filled with fine sand at the periphery of the earth pressure box; a notch is formed in the top of the pod box cover, and the earth pressure cell cable penetrates through the notch. The casing pipe is synchronously inserted into the drilled hole for protection, then the soil pressure box is installed through hoisting, it can be guaranteed that the periphery of the soil pressure box is in close contact and can be close to the actual in-situ condition as much as possible, the pressure monitoring precision is guaranteed, meanwhile, the casing pipe is protected and filled with fine sand, and therefore in the installation process of the soil pressure box, the soil pressure box can be installed more accurately. Collapse can be avoided, the adaptability is high, and the method can adapt to the geological conditions that the underground water level burial depth is small and drill holes are prone to collapse.

Description

Technical Field

[0001] The invention relates to the technical field of pressure monitoring, in particular to a method for installing a combined pod type earth pressure box. Background Art

[0002] During the construction process, when building high-rise buildings in densely packed buildings, underground continuous concrete walls are usually supported by temporary guardrails to prevent the original soil from being destroyed and causing damage to the building. During the construction of the continuous wall, the changes in the earth pressure in the original soil are monitored to ensure the safety of the construction. Therefore, in the process of monitoring the earth pressure, it is necessary to use an earth pressure box buried in the soil for monitoring;

[0003] The existing earth pressure box is difficult to operate during the installation process, and the surrounding filling compactness is poor after the earth pressure box is installed, which affects the accuracy of earth pressure monitoring. There are also certain troubles when it comes to address conditions prone to collapse. Therefore, we propose a combined pod-type earth pressure box installation method. Summary of the invention

[0004] The object of the present invention is to provide a method for installing a combined pod type earth pressure box, which solves the problems raised in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a method for installing a combined pod-type earth pressure box, comprising a casing, a chuck bracket, a pod, a tray, an earth pressure box, a connecting rod, a hanging rope, and a chuck hole;

[0006] The surface of the chuck bracket is provided with a chuck hole;

[0007] The pod and the tray are combined to form a whole, the earth pressure box is placed in the pod, and the pod is filled with fine sand around the earth pressure box; a cutout is opened on the top of the pod cover, and the earth pressure box cable is arranged through the cutout;

[0008] The specific installation method is as follows:

[0009] Step 1: Drill a hole to a predetermined position and insert the casing to the corresponding position using equipment;

[0010] Step 2: Backfill the hole with fine sand and compact it until the bottom surface of the hole reaches the bottom of the casing;

[0011] Step 3: Place the chuck bracket at the drilling hole. On the chuck bracket, use three strands of rope to pass through the chuck holes and connect the ends to the tray of the pod.

[0012] Step 3: On the chuck bracket, the first connecting rod is connected to the conical top of the pod with a threaded sleeve, the rope is slowly and synchronously released, and the connecting rods are connected one by one. The pod slowly descends, and the position of the pod is controlled so that the earth pressure box in it reaches the predetermined position. The earth pressure box and the cable attached to it descend synchronously;

[0013] Step 4: Use the connecting rod to fine-tune and confirm the position of the earth pressure box again. After confirmation, fill the space between the casing and the outer wall of the nacelle with fine sand, cut the rope at the hole, and remove the chuck;

[0014] Step 5: Pull up the casing and fill it with a certain amount of fine sand again to fill the gap left by the removed section of the casing. Separate the connecting rod from the earth pressure box cable, shake the connecting rod slowly, and lift the connecting rod lightly at the same time, lift the connecting rod section by section, take out the pod box cover, and then backfill the fine sand until the hole mouth;

[0015] Step 6: Pull out the casing section by section, remove all the casing, properly protect the cable head of the earth pressure box, and measure the initial reading.

[0016] As a preferred embodiment of the present invention, in step 2, the height of the fine sand filling is to 5 cm above the bottom of the casing.

[0017] As a preferred embodiment of the present invention, the distance between the chuck bracket and the orifice is 50 cm.

[0018] As a preferred embodiment of the present invention, standard scale lines are provided on the surface of the sling.

[0019] As a preferred embodiment of the present invention, in step five, the sleeve is pulled up by a distance of 30 cm.

[0020] As a preferred embodiment of the present invention, the number of the chuck holes is three and they are evenly distributed on the surface of the chuck bracket.

[0021] As a preferred embodiment of the present invention, in step 4, the amount of fine sand filled is enough to cover the conical opening of the pod.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention inserts casings synchronously through drilling for protection, and then installs the earth pressure box by hoisting, thereby ensuring close contact around the earth pressure box and being as close to the actual in-situ conditions as possible, thereby ensuring the accuracy of pressure monitoring;

[0024] At the same time, the casing is protected and filled with fine sand, so as to avoid collapse during the installation of the earth pressure box. It has strong adaptability and can adapt to geological conditions where the groundwater level is shallow and the borehole is prone to collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 A schematic diagram of a combined pod-type earth pressure cell installation method of the present invention;

[0027] Figure 2 The present invention is a schematic diagram of a chuck structure in a combined pod type earth pressure box installation method.

[0028] Figure numerals: 1. casing; 2. chuck bracket; 3. pod; 4. tray; 5. earth pressure box; 6. connecting rod; 7. lifting rope; 8. chuck hole. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0030] See also Figure 1-2 The present invention provides a technical solution: a combined pod type earth pressure box installation method:

[0031] In the present invention, a chuck hole 8 is provided on the surface of the chuck bracket 8;

[0032] The pod 3 and the tray 4 are combined to form a whole, the earth pressure box 5 is placed in the pod 3, and the pod 3 is filled with fine sand around the earth pressure box 5; a cutout is opened on the top of the pod 3 cover, and the earth pressure box 5 cable is arranged through the cutout.

[0033] The present invention includes the following specific implementation steps:

[0034] 1. Drilling (casing 1 follows) to the predetermined position;

[0035] 2. Backfill the hole with fine sand and compact it until the bottom of the hole reaches 5 cm above the bottom of casing 1;

[0036] 3. Assemble the pod 3 cover and the circular tray 4 with holes, properly place the earth pressure box 4 in the pod and fill the surrounding fine sand, and lead the cables of the earth pressure box 4 out from the incision;

[0037] 4. Place the chuck bracket 2 at the drilling hole (the bottom of the chuck is about 50 cm away from the hole);

[0038] 5. On the chuck bracket 2, three ropes 7 are passed through the chuck holes 8 respectively, and the ends are connected to the tray 4 of the pod 3;

[0039] Among them, the suspension rope 7 is of the type with accurately calibrated length scale;

[0040] 6. On the chuck bracket 2, the first connecting rod (using a threaded sleeve) is connected to the conical top of the pod 3 box;

[0041] 7. Release the suspension rope 7 slowly and synchronously, and connect the connecting rods 6 one by one. The pod 3 slowly moves downward. The position of the pod 3 is controlled by the scale mark of the suspension rope 7, so that the earth pressure box 4 therein reaches the predetermined position. The earth pressure box 4 moves downward synchronously with the attached cable;

[0042] 8. Fine-tune and confirm the position of the earth pressure box 4 again through the connecting rod 6. After confirmation, fill the space between the casing 1 and the outer wall of the pod 3 with fine sand (the amount should be enough to cover the conical opening of the pod 3);

[0043] 9. Cut the hanging rope 7 at the hole and remove the chuck (keep the bracket);

[0044] 10. Pull up the casing 1 by about 30 cm (the casing 1 pulling operation is performed by the drilling machine left nearby);

[0045] 11. A certain amount of fine sand is filled again (preferably to fill the gap left by the removed section of the casing 1), and the connecting rod 6 is separated from the cable of the earth pressure box 4;

[0046] 12. Slowly shake the connecting rod 6 and lift it lightly at the same time, lift out the connecting rod 6 section by section, and take out the pod box cover;

[0047] 13. Backfill with fine sand until the hole mouth;

[0048] 14. Remove the casing 1 section by section until the casing 1 is completely removed;

[0049] 15. Properly protect the cable head of the earth pressure box line 4 and measure the initial reading.

[0050] In summary, the present invention inserts casings for protection by drilling holes simultaneously, and then installs the earth pressure box by hoisting, so as to ensure that the surrounding of the earth pressure box is in close contact and as close to the actual in-situ conditions as possible, thereby ensuring the accuracy of pressure monitoring;

[0051] At the same time, the casing is protected and filled with fine sand, so as to avoid collapse during the installation of the earth pressure box. It has strong adaptability and can adapt to geological conditions where the groundwater level is shallow and the borehole is prone to collapse.

[0052] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A combined pod type earth pressure cell installation method, characterized in that: It comprises a casing (1), a chuck bracket (2), a pod (3), a tray (4), an earth pressure box (5), a connecting rod (6), a suspension rope (7), and a chuck hole (8); A chuck hole (8) is provided on the surface of the chuck bracket (8); The pod (3) and the tray (4) are combined to form a whole, the earth pressure box (5) is placed in the pod (3), and the pod (3) is filled with fine sand around the earth pressure box (5); a cutout is provided on the top of the pod (3) cover, and the cables of the earth pressure box (5) are arranged through the cutout; The specific installation method is as follows: Step 1: drilling a hole to a predetermined position, and inserting a casing (1) to a corresponding position using a device; Step 2: backfill the hole with fine sand and compact it until the bottom surface of the hole reaches the bottom of the casing (1); Step 3: Place the chuck bracket (2) at the drill hole, and use three ropes (7) to pass through the chuck holes (8) on the chuck bracket (2), and connect the ends of the ropes to the tray (4) of the pod (3); Step 3: On the chuck bracket (2), the first connecting rod (using a threaded sleeve) is connected to the conical top of the pod (3), the suspension rope (7) is slowly and synchronously released, and the connecting rods (6) are connected one by one, the pod slowly descends, the position of the pod (3) is controlled, and the earth pressure box (4) therein reaches the predetermined position, and the earth pressure box (4) and the attached cable are synchronously descended; Step 4: Use the connecting rod (6) to fine-tune and confirm the position of the earth pressure box (4). After confirmation, fill the space between the casing (1) and the outer wall of the pod (3) with fine sand, cut the suspension rope (7) at the hole, and remove the chuck; Step 5: Pull up the casing (1), fill it with a certain amount of fine sand again to fill the gap left by the removed section of the casing (1), separate the connecting rod (6) from the cable of the earth pressure box (4), shake the connecting rod (6) slowly, and lift the connecting rod (6) lightly at the same time, lift the connecting rod (6) section by section, take out the pod box cover, and then backfill the fine sand until the hole mouth; Step 6: Pull out the casing (1) section by section, remove all the casing (1), properly protect the cable head of the earth pressure box line (4), and measure the initial reading.

2. A combined pod type earth pressure cell installation method according to claim 1, characterized in that: In step 2, the fine sand is filled to a height of 5 cm above the bottom of the casing (1).

3. The method for installing a combined pod type earth pressure cell according to claim 1, characterized in that: The distance between the chuck bracket (2) and the orifice is 50 cm.

4. The method for installing a combined pod type earth pressure cell according to claim 1, characterized in that: The surface of the suspension rope (7) is provided with standard scale lines.

5. The method for installing a combined pod type earth pressure cell according to claim 1, characterized in that: In the step 5, the sleeve (1) is pulled up by a distance of 30 cm.

6. The method for installing a combined pod type earth pressure cell according to claim 1, characterized in that: The number of the chuck holes (8) is three and they are evenly distributed on the surface of the chuck bracket (2).

7. The method for installing a combined pod type earth pressure cell according to claim 1, characterized in that: In step 4, the fine sand is filled in an amount sufficient to cover the conical opening of the pod (3).

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