Bedrock mark bottom

Abstract

The utility model relates to a base rock mark bottom, which comprises a connector for cement paste to enter, a paste blocking mechanism arranged in the connector and used for blocking the cement paste, a connecting pipe connected with the lower part of the connector, a check valve connected with the lower part of the connecting pipe, and a mark bottom tray connected to the bottom of the check valve, and the check valve is used for enabling the internal cement paste to flow out from the bottom of the mark bottom tray. And the slurry blocking mechanism comprises a piston arranged in the connector and a ball body detachably attached to the interior of the piston, the ball body is used for blocking the cement slurry, the outer side of the connector is sleeved with a slurry blocking disc, and the slurry blocking disc is used for preventing the cement slurry from falling into the outer side of the connector. The utility model provides the bed rock mark bottom which has the function of blocking cement paste, and the effect of blocking the cement paste can be achieved through manual cooperation after the grouting amount reaches the standard, so that the situation of excessive grouting is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of land subsidence monitoring, and particularly relates to a bedrock benchmark bottom end. Background Art

[0002] A bedrock benchmark is a punctuation mark buried in bedrock. In the land subsidence area, after stability protection treatment, by jointly measuring with other layer benchmarks and bedrock benchmarks, the compression and expansion amounts of different soil layers can be measured, so as to calculate the deformation amounts of different soil layers and the total land subsidence amount. At present, in the construction of bedrock benchmarks, the bottom end of the bedrock benchmark needs to be fixed underground by means of cement grouting. Usually, grouting is carried out from the middle part of the bottom end of the bedrock benchmark, and the cement slurry will flow out from the bottom of the bottom end and spread to the outside of the bottom end. However, it is usually difficult to control the degree of grouting during the grouting process. For example, when the amount of grouting has reached the standard, the grouting equipment does not stop immediately, and a part of grouting will still be carried out to the bottom end of the bedrock benchmark before completely stopping, which is likely to cause the situation of excessive grouting. Therefore, a bedrock benchmark bottom end with a function of blocking grouting is needed, and the utility model solves this technical problem. Content of the Utility Model

[0003] The utility model provides a bedrock benchmark bottom end, which has the function of blocking cement slurry, and can achieve the effect of blocking cement slurry through manual cooperation after the amount of grouting reaches the standard, so as to avoid the occurrence of excessive grouting.

[0004] A bedrock benchmark bottom end includes a joint for the entry of cement slurry, a slurry blocking mechanism arranged in the joint and used for blocking cement slurry, a connecting pipe connected to the lower part of the joint, a check valve connected to the lower part of the connecting pipe, and a bottom end tray of the benchmark connected to the bottom of the check valve. The check valve is used for the cement slurry inside to flow out from the bottom of the bottom end tray and prevent the cement slurry outside from flowing back into the inside.

[0005] Further, the slurry blocking mechanism includes a piston arranged in the joint and a sphere detachably fitted inside the piston. The sphere is used for blocking cement slurry, and a slurry blocking disc is sleeved on the outer side of the joint. The slurry blocking disc is used for blocking the cement slurry from falling into the outer side of the joint.

[0006] Further, the outer side of the piston is slidably connected to the inner side of the joint, the bottom of the piston is connected to an upper spring seat, and the upper spring seat is connected inside the joint.

[0007] Further, the check valve includes a valve body, a valve core arranged in the valve body, a push rod connected to the top of the valve core, a nut connected to the outer side of the push rod, and a lower spring seat fitting against the bottom of the nut. The side of the lower spring seat is slidably connected inside the valve body, the spring of the lower spring seat is fixed inside the valve body, and a slurry outlet hole is formed in the lower spring seat.

[0008] The working process of the present utility model is as follows:

[0009] (1) A slurry blocking mechanism is provided in this device to block the cement slurry after the grouting volume reaches the standard. When it is necessary to stop grouting, the sphere can be dropped into the joint manually, so that the sphere is located inside the piston, thereby blocking part of the cement slurry falling from above. And under the elastic force of the upper spring seat, part of the cement slurry inside the joint will be pushed out and fall onto the slurry blocking plate, avoiding excessive cement slurry falling below;

[0010] (2) The check valve can prevent the cement slurry flowing out of the bottom of the benchmark from flowing back into the bottom of the benchmark. The cement slurry falling into the bottom of the benchmark will exert pressure on the lower spring seat, causing the lower spring seat to move downward, so that the push rod moves downward under its own gravity, thereby causing the valve core to move downward, creating a gap between it and the valve body. The cement slurry passing through the lower spring seat will flow out of the bottom of the benchmark through this gap. And when the cement slurry flows back, the cement slurry will push the valve core upward to make it fit with the valve body, thereby blocking the backflow of the cement slurry. Description of the Drawings

[0011] Figure 1 It is a cross-sectional view of the present utility model.

[0012] Among them, the description of the drawings is as follows: 1. Joint; 2. Piston; 3. Upper spring seat; 4. Slurry blocking plate; 5. Connecting pipe; 6. Lower spring seat; 7. Push rod; 8. Spring; 9. Valve body; 10. Valve core; 11. Benchmark tray. Detailed Embodiments

[0013] The technical solutions of the present utility model will be clearly and completely described below in conjunction with specific embodiments and the accompanying drawings.

[0014] See Figure 1 , a bedrock benchmark bottom, including a joint 1 for the entry of cement slurry, a slurry blocking mechanism provided inside the joint 1 for blocking the cement slurry, a connecting pipe 5 connected to the lower part of the joint 1, a check valve connected to the lower part of the connecting pipe 5, and a benchmark tray 11 connected to the bottom of the check valve. The check valve is used for the cement slurry inside to flow out from the bottom of the benchmark tray 11 and prevent the cement slurry outside from flowing back into the inside. Preferably, through holes can be opened on the side of the connecting pipe 5 in this embodiment for subsequent ground settlement monitoring work, which will not be elaborated here.

[0015] Since the benchmark is usually connected to the plugging rod, there is a certain gap between the benchmark and the bottom of the well, which is convenient for the flow of cement slurry. This belongs to the prior art known to those skilled in the art and will not be elaborated here.

[0016] Further, the slurry blocking mechanism includes a piston 2 disposed in the joint 1 and a sphere detachably fitted within the piston 2. The sphere is used to block the cement slurry. A slurry blocking disc 4 is sleeved on the outer side of the joint 1, and the slurry blocking disc 4 is used to block the cement slurry from falling into the outer side of the joint 1. Figure 1 The circular dotted line part in

[0017] Further, the outer side of the piston 2 is slidably connected to the inner side of the joint 1. The bottom of the piston 2 is connected to the upper spring seat 3, and the upper spring seat 3 is connected within the joint 1.

[0018] Further, the check valve includes a valve body 9, a valve core 10 disposed within the valve body 9, a push rod 7 connected to the top of the valve core 10, a nut connected to the outer side of the push rod 7, and a lower spring seat 6 fitted against the bottom of the nut. The side of the lower spring seat 6 is slidably connected within the valve body 9. The spring 8 of the lower spring seat 6 is fixed within the valve body 9. An out-slurry hole is provided on the lower spring seat 6, and the cement slurry can pass through the out-slurry hole. In this embodiment, the position where the out-slurry hole is provided is between the spring 8 and the push rod 7.

[0019] The working process of the present utility model is as follows:

[0020] Grouting work is carried out on the bottom plate placed in the well. The cement slurry will sequentially pass through the piston 2 and the connecting pipe 5, and then fall onto the lower spring seat 6. Part of the cement slurry passes through the out-slurry hole on the lower spring seat 6, specifically falling in the space between the spring 8 and the push rod 7 and onto the valve core 10. Another part of the cement slurry on the lower spring seat 6 will press down the lower spring seat 6 under the action of its own gravity. At this time, the lower spring seat 6 moves downward, and the push rod 7 and the valve core 10 move downward under the action of gravity. The nut on the push rod 7 will abut against the lower spring seat 6, so that there is a gap between the valve core 10 and the inner wall of the valve body 9. The flowing cement slurry will fall from the gap, pass through the bottom plate tray 11 and be located between the bottom plate tray 11 and the bottom of the well, and gradually flow outward to the outer side of the bottom plate tray 11. Under the action of the subsequent cement slurry, the external cement slurry will move upward to wrap the outer sides of the bottom plate tray 11 and the check valve;

[0021] The staff will judge whether the grouting volume meets the standard according to the grouting volume. When the grouting volume meets the standard, the staff will put a sphere into the well and close the grouting device. Since the gap between the inner wall of the well and the outer side of the joint 1 is small, the sphere will fall into the joint 1 and then into the piston 2 to block the upper cement slurry. The upper spring seat 3 will push the cement slurry upward under the action of its own elastic force to prevent the cement slurry from accumulating in the joint 1. The pushed-out cement slurry will fall onto the external slurry blocking disc 4 to prevent it from falling downward;

[0022] At this time, the cement slurry on the lower spring seat 6 gradually flows down from the slurry outlet hole and flows out through the check valve. After the lower spring seat 6 loses the downward pressure, it will drive the push rod 7 to rise through the nut, and then drive the valve core 10 to rise, so that it fits with the valve body 9 to complete the reset; and when the cement slurry flows back, the cement slurry will push the valve core 10 to rise, so that it fits with the valve body 9, thereby blocking the backflow of the cement slurry.

[0023] The above embodiments are only the preferred embodiments of the present invention. Those skilled in the art can obtain other embodiments from the above embodiments without creative efforts. Therefore, the scope protected by this application is not only the above embodiments, but the scope consistent with the principles and features of this application.

Claims

1. A bedrock benchmark bottom, characterized in that It includes a joint (1) for the entry of cement slurry, a slurry blocking mechanism arranged inside the joint (1) and used for blocking the cement slurry, a connecting pipe (5) connected to the lower part of the joint (1), a check valve connected to the lower part of the connecting pipe (5), and a bottom plate tray (11) connected to the bottom of the check valve. The check valve is used for the cement slurry inside to flow out from the bottom of the bottom plate tray (11) and prevent the cement slurry on the outer side from flowing back into the inside.

2. The bedrock benchmark bottom according to claim 1, characterized in that, The slurry blocking mechanism includes a piston (2) arranged inside the joint (1) and a sphere detachably fitted inside the piston (2). The sphere is used for blocking the cement slurry. A slurry blocking disc (4) is sleeved on the outer side of the joint (1), and the slurry blocking disc (4) is used for blocking the cement slurry from falling into the outer side of the joint (1).

3. The bedrock benchmark bottom according to claim 2, characterized in that, The outer side of the piston (2) is slidably connected to the inner side of the joint (1). The bottom of the piston (2) is connected to an upper spring seat (3), and the upper spring seat (3) is connected inside the joint (1).

4. The bedrock benchmark bottom according to claim 1, characterized in that, The check valve includes a valve body (9), a valve core (10) arranged inside the valve body (9), a push rod (7) connected to the top of the valve core (10), a nut connected to the outer side of the push rod (7), and a lower spring seat (6) fitted to the bottom of the nut. The side of the lower spring seat (6) is slidably connected inside the valve body (9). A spring (8) of the lower spring seat (6) is fixed inside the valve body (9), and a slurry outlet hole is formed in the lower spring seat (6).

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