A device for preventing subsidence around a well and a method for preventing subsidence

Abstract

The present invention relates to a device for preventing settlement around a well and a method for preventing settlement thereof, which includes a wellbore, a well chamber and a well cover. The wellbore includes a main body, and an installation bottom edge is integrally formed at the bottom of the main body. The wellbore is fixed above the well chamber through the installation bottom edge; a crushed stone layer is buried around the installation bottom edge and the well chamber, and the upper surface of the crushed stone layer is flush with the upper plane of the installation bottom edge. A bridging slab for dispersing the load from the road surface is placed on the upper plane of the installation bottom edge. One end of the bridging slab abuts against a stop block arranged on the installation bottom edge, and the other end of the bridging slab extends to the crushed stone layer; a bent conduit is installed in the well wall of the well chamber. The beneficial effects of the present invention are as follows: By means of the prefabricated bridging slab and the wellbore and crushed stone layer that are matched with the bridging slab, the bearing capacity of the roadbed can be greatly improved. At the same time, a conduit is provided on the well wall of the well chamber, so that the bearing capacity of the crushed stone layer can be increased by injecting cement slurry from the conduit in the later stage, and the road surface will not settle with the settlement of the roadbed.

Description

Technical Field

[0001] The present invention belongs to the technical field of building construction, and particularly relates to an anti-settlement device around a well and an anti-settlement method thereof. Background Art

[0002] The manhole is buried in the soil. With the increasing flow of people and vehicles, it often causes the settlement of the manhole. There is also a possibility that the geological conditions where the manhole is located are poor, the roadbed settles, and the road surface in the well perimeter area also settles accordingly. The manhole cover protrudes from the road surface, making the road surface uneven, which has a greater impact on pedestrians and vehicles. At present, the main treatment method is to control the backfill quality around the well in order to reduce the settlement. However, due to the inconsistent structures of the two, especially in the soft soil foundation area, the settlement difference between the two is large, resulting in large road surface settlement and the manhole cover protruding, thus causing the road surface to be uneven; affecting the beauty of the road and posing a danger to pedestrians and vehicles. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies existing in the prior art, and to provide an anti-settlement device around a well and an anti-settlement method thereof, which can increase the supporting force for the road surface in the well perimeter area when the roadbed settles; the road surface in the well perimeter area does not settle with the settlement of the roadbed, so as to prevent the manhole cover from protruding from the road surface.

[0004] The purpose of the present invention is completed by the following technical solutions. This anti-settlement device around a well includes a wellbore, a well chamber and a manhole cover. The wellbore is located above the well chamber, and the manhole cover is connected to the wellbore and is flush with the road surface. The wellbore includes a main body, and an installation bottom edge is integrally formed at the bottom of the main body. The wellbore is fixed above the well chamber through the installation bottom edge; a crushed stone layer is buried around the installation bottom edge and the well chamber, and the upper surface of the crushed stone layer is flush with the upper plane of the installation bottom edge. A bridging slab for dispersing the load from the road surface in the well perimeter area is placed on the upper plane of the installation bottom edge. One end of the bridging slab abuts against a stop block provided on the installation bottom edge, and the other end of the bridging slab extends to the crushed stone layer; a bent conduit is installed in the well wall of the well chamber. One end of the conduit extends into the crushed stone layer, and the other end of the conduit is exposed outside the well wall. Cement slurry can be injected in time through the conduit to prevent the settlement of the road surface in the well perimeter area.

[0005] Preferably, the conduit is in a Z-shaped structure. The conduit is arranged vertically along the well wall, and the main body of the conduit is located inside the well wall; at least two conduits are provided on each side of the well wall, and the end of the conduit extending into the crushed stone layer is below the end of the conduit exposed outside the well wall.

[0006] Preferably, the distance between the end of the conduit extending into the crushed stone layer and the lower bottom surface of the crushed stone layer is 15 to 20 cm, and the distance between the end of the conduit exposed outside the well wall and the installation bottom edge is 10 to 15 cm.

[0007] Preferably, four blocks are provided and distributed around the main body of the shaft in a surrounding manner, the blocks are integrally cast on the installation bottom edge, and the distance between the blocks and the main body is 20 to 30 cm.

[0008] Preferably, the scaffolding is integrally cast and extends outwardly around the main body in a diffused manner to the pond slag layer, and the width of the scaffolding extending to the pond slag layer is 50 to 80 cm.

[0009] Preferably, the well wall of the well chamber is provided with transverse through holes, at least two transverse through holes are provided on each side of the well wall and are arranged vertically along the well wall, and the transverse through holes are located between the two ends of the conduit.

[0010] An anti-sinking method using the well peripheral anti-sinking device as described above comprises the following steps:

[0011] 1) Treat the roadbed around the well chamber and compact it with pond slag, so that the upper surface of the pond slag layer after compaction is flush with the installation bottom edge of the wellbore;

[0012] 2) Place the integrally formed scaffolding on the installation bottom edge and the pond slag layer, and cast a stopper around the installation bottom edge, and use the stopper cast on the installation bottom edge to limit the movement of the scaffolding after placement;

[0013] 3) A groove for pre-buried conduit is drilled on the wall of the well chamber, and the conduit is installed in the groove;

[0014] 4) When a slight settlement of the road surface is found, cement slurry can be injected in time through the grouting port of the catheter. The cement slurry is injected into the pond slag layer through the slurry outlet of the catheter to prevent the road surface in the area around the well from settling again.

[0015] Preferably, in the above steps 3) and 4), if the thickness of the pond slag layer is relatively thick, a transverse through hole is drilled on the wall of the well chamber and extends all the way into the pond slag layer. By inserting a pipe for injecting cement slurry into the transverse through hole, cement slurry can be injected in time through the pipe to overcome the further settlement of the road surface in the surrounding area of ​​the well caused by the thickness of the pond slag layer.

[0016] The beneficial effects of the present invention are as follows: the bearing capacity of the roadbed can be greatly improved by means of the prefabricated scaffolding and the shaft and pond slag layer matched with the scaffolding, and at the same time, a conduit is provided on the wall of the well chamber, so that cement slurry injected from the conduit later can increase the bearing capacity of the pond slag layer, so that the road surface does not settle with the settlement of the roadbed; if the pond slag layer is thick, a transverse through hole can be provided on the well wall, so as to further prevent the road surface in the well surrounding area from settling again due to the thickness of the pond slag layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view structural schematic diagram of the present invention.

[0018] Figure 2 It is a top view structural schematic diagram of the present invention.

[0019] Figure 3 It is a distribution structural schematic diagram between the conduit and the transverse through-hole on the wellbore wall of the present invention.

[0020] The reference numerals in the drawings are respectively: 1, wellbore; 2, well chamber; 3, well cover; 4, road surface in the well perimeter area; 5, crushed stone layer; 6, approach slab; 7, conduit; 11, main body; 12, installation bottom edge; 13, stop block; 21, wellbore wall; 22, transverse through-hole. Specific embodiments

[0021] The following will introduce the present invention in detail with reference to the drawings: As shown in Figure 1 , 2 , the present invention includes a wellbore 1, a well chamber 2 and a well cover 3. The wellbore 1 is located above the well chamber 2, and the well cover 3 is connected to the wellbore 1 and is flush with the road surface 4 in the well perimeter area. The wellbore 1 includes a main body 11, and an installation bottom edge 12 is integrally formed at the bottom of the main body 11. The wellbore 1 is fixed above the well chamber 2 through the installation bottom edge 12, and the outer side edge of the installation bottom edge 12 is flush with the outer side wall of the well chamber 2. The purpose of this is that since the well cover 3 on the wellbore 2 directly bears the external load, this can make the load from the road surface in the well perimeter area concentrate on the wellbore wall 21 of the well chamber 2, rather than partially acting on the crushed stone layer 5; The installation bottom edge 12 and the periphery of the well chamber 2 are buried with a crushed stone layer 5, and the upper surface of the crushed stone layer 5 is flush with the upper plane of the installation bottom edge 12. An approach slab 6 for dispersing the load from the road surface is placed on the upper plane of the installation bottom edge 12, so that the load from the road surface can be dispersed to the wellbore wall 21 of the well chamber 2 and the crushed stone layer 5, which can greatly improve the bearing capacity of the subgrade around the well; To further promote the simultaneous settlement of the wellbore 1 and the crushed stone layer 5, after the approach slab 6 is placed on the installation bottom edge 12, it is fixed through expansion bolts, which can avoid the unilateral settlement of the approach slab 6 located on the crushed stone layer 5. One end of the approach slab 6 abuts against the stop block 13 provided on the installation bottom edge 12 to prevent the approach slab 6 from moving, thereby damaging the wellbore 1; The other end of the approach slab 6 extends to the crushed stone layer 5, so that the load from the road surface in the well perimeter area can be dispersed to the crushed stone layer 5; A bent conduit 7 is installed inside the wellbore wall 21 of the well chamber 2. One end of the conduit 7 extends into the crushed stone layer 5, that is, the slurry outlet of the conduit 7, and the other end of the conduit 7 is exposed outside the wellbore wall 21, that is, the grouting port of the conduit 7. Cement slurry can be injected in time through the conduit 7 to prevent the settlement of the road surface 4 in the well perimeter area, thereby preventing the wellbore 1 or the well cover 3 from protruding above the ground and causing the road surface to be uneven.

[0022] The conduit 7 is of a Z-shaped structure. The conduit 7 is arranged vertically along the well wall 21, and the main body of the conduit 7 is located inside the well wall 21. At least two conduits 7 are provided on each side of the well wall 21, generally three conduits which are arranged at equal intervals, so that the cement slurry introduced into the conduit 7 can fully flow into and evenly diffuse to each edge of the crushed stone layer 5. And the end of the conduit extending into the crushed stone layer 5 is located below the end of the conduit exposed outside the well wall 21, that is, the slurry outlet is located below the grouting port, which is convenient for injecting the cement slurry. The precast slab and the reserved conduit can greatly improve the bearing capacity of the roadbed, greatly reduce the cost of later repair of the manhole, reduce the maintenance cost, and improve the project quality.

[0023] The conduit 7 is of a Z-shaped structure. The conduit 7 is arranged vertically along the well wall 21, which can prevent the cement slurry from flowing back into the well chamber 2 during the injection of the cement slurry, and the main body of the conduit 7 is located inside the well wall 21. The distance H1 between the end of the conduit extending into the crushed stone layer 5 and the bottom surface of the crushed stone layer 5 is 15 to 20 cm, so that the bottom of the crushed stone layer 5 can be injected with cement slurry. The distance H2 between the end of the conduit exposed outside the well wall 21 and the installation bottom edge 12 is 10 to 15 cm, which is convenient for connecting the external grouting pipe with the conduit 7.

[0024] Four retaining blocks 13 are provided and are distributed around the main body 11 of the wellbore 1 in a surrounding manner. The retaining blocks 13 are integrally cast on the installation bottom edge 12, so that whether the slab 6 is integral or split, it can avoid colliding with the wellbore 1. And the distance H3 between the retaining block 13 and the main body 11 is 20 to 30 cm, which can avoid the slab 6 from moving and damaging the wellbore 1.

[0025] The slab 6 is integrally cast and extends outward around the main body 11 in a diffused shape to the crushed stone layer 5. And the width of the slab 6 extending to the crushed stone layer 5 is 50 to 80 cm, so that the load from the road surface in the well perimeter area can be fully dispersed to the crushed stone layer 5.

[0026] When the thickness of the crushed stone layer 5 is relatively thick, direct injection of cement slurry through the conduit 7 will still cause the road surface in the well perimeter area to subside again. Therefore, a horizontal through hole 22 is provided in the well wall 21 of the well chamber 2. At least two horizontal through holes 22 are provided on each side of the well wall 21 and are arranged vertically along the well wall 21. And the horizontal through hole 22 is located between the upper and lower ends of the conduit 7, that is, between the positions of the well wall 21 where the grouting port and the slurry outlet are located; as shown in the appendix Figure 3 As shown, when the width of the well wall 21 is relatively wide, if three conduits 7 are provided at this time, a horizontal through hole 22 is provided between adjacent conduits 7. In this way, the relatively thick and wide crushed stone layer 5 can be sufficiently injected with cement slurry through the conduits 7 and the pipes in the horizontal through holes 22, thereby overcoming the settlement of this crushed stone layer 5.

[0027] An anti-settlement method using the well perimeter anti-settlement device includes the following steps:

[0028] 1), treat the roadbed around the well chamber 2 and tamp it with crushed stone. The upper surface of the crushed stone layer 5 after tamping is flush with the installation bottom edge 12 of the well tube 1;

[0029] 2), place the integrally formed bridging slab 6 on the installation bottom edge 12 and the crushed stone layer 5. A retaining block 13 is cast around the installation bottom edge 12, and the movement of the bridging slab 6 after placement is limited by the retaining block 13 cast on the installation bottom edge 12;

[0030] 3), a groove for pre-embedding the conduit 7 is chiseled on the well wall 21 of the well chamber 2, and the conduit 7 is installed into the groove;

[0031] 4), when it is found that the road surface 4 in the well perimeter area has a little settlement, at this time, cement slurry can be injected in time through the grouting port of the conduit 7. The cement slurry is injected into the crushed stone layer 5 through the slurry outlet of the conduit 7 to prevent the road surface 4 in the well perimeter area from settling again.

[0032] In the above steps 3) and 4), if the thickness of the crushed stone layer 5 is relatively thick, at this time, a horizontal through hole 22 is drilled on the well wall 21 of the well chamber 2 and extends into the crushed stone layer 5 all the way. By inserting a tube for injecting cement slurry into the horizontal through hole 22, cement slurry can be injected in time through this tube to overcome the re-settlement of the road surface in the well perimeter area caused by the thickness of the crushed stone layer.

[0033] It can be understood that for those skilled in the art, equivalent replacement or change of the technical solution and inventive concept of the present invention should fall within the protection scope of the appended claims of the present invention.

Claims

1. A well perimeter anti-settlement device, comprising a wellbore (1), a well chamber (2) and a well cover (3), wherein the wellbore (1) is located above the well chamber (2), and the well cover (3) is connected to the wellbore (1) and is flush with the road surface (4) in the well perimeter area, characterized in that: The wellbore (1) includes a main body (11), and an installation bottom edge (12) is integrally formed at the bottom of the main body (11). The wellbore (1) is fixed above the well chamber (2) through the installation bottom edge (12); a crushed stone layer (5) is buried around the installation bottom edge (12) and the well chamber (2), and the upper surface of the crushed stone layer (5) is flush with the upper plane of the installation bottom edge (12). A bridging slab (6) for dispersing the load from the road surface is placed on the upper plane of the installation bottom edge (12). One end of the bridging slab (6) abuts against a stop block (13) provided on the installation bottom edge (12), and the other end of the bridging slab (6) extends onto the crushed stone layer (5); a bent conduit (7) is installed inside the well wall (21) of the well chamber (2). One end of the conduit (7) extends into the crushed stone layer (5), and the other end of the conduit (7) is exposed outside the well wall (21). Cement slurry can be injected in time through the conduit (7) to prevent the settlement of the road surface (4) in the well perimeter area; the conduit (7) is of a Z-shaped structure. The conduit (7) is arranged vertically along the well wall (21), and the main body of the conduit (7) is located inside the well wall (21); at least two conduits (7) are provided on each side of the well wall (21), and the conduit end extending into the crushed stone layer (5) is below the conduit end exposed outside the well wall (21).

2. The well perimeter anti-settlement device according to claim 1, characterized in that: The distance H1 between the conduit end extending into the crushed stone layer (5) and the lower bottom surface of the crushed stone layer (5) is 15 to 20 cm, and the distance H2 between the conduit end exposed outside the well wall (21) and the installation bottom edge (12) is 10 to 15 cm.

3. The well perimeter anti-settlement device according to claim 1, characterized in that: Four stop blocks (13) are provided and are distributed around the main body (11) of the wellbore (1) in a surrounding manner. The stop blocks (13) are integrally cast on the installation bottom edge (12), and the distance H3 between the stop blocks (13) and the main body (11) is 20 to 30 cm.

4. The well perimeter settlement prevention device according to claim 1, characterized in that: The bridging slab (6) is integrally cast and extends outward around the main body (11) in a diffused shape onto the crushed stone layer (5), and the width of the bridging slab (6) extending onto the crushed stone layer (5) is 50 to 80 cm.

5. The well perimeter settlement prevention device according to claim 1, characterized in that: The well wall (21) of the well chamber (2) is provided with transverse through holes (22). At least two transverse through holes (22) are provided on each side of the well wall (21) and are arranged vertically along the well wall (21), and the transverse through holes (22) are located between the two ends of the conduit (7).

6. A method for preventing settlement using the wellbore anti-settlement device according to any one of claims 1 to 5, characterized in that: It includes the following steps: 1) Treat the roadbed around the well chamber (2) and tamp it with crushed stone. The upper surface of the crushed stone layer (5) after tamping is flush with the installation bottom edge (12) of the wellbore (1); 2) Place the integrally formed bridging slab (6) on the installation bottom edge (12) and the crushed stone layer (5). Stop blocks (13) are cast around the installation bottom edge (12), and the movement of the placed bridging slab (6) is limited by the stop blocks (13) cast on the installation bottom edge (12); 3) Chisel a groove for pre-embedding the conduit (7) on the well wall (21) of the well chamber (2) and install the conduit (7) into the groove; 4), When a slight settlement occurs on the road surface (4) in the well perimeter area, at this time, cement slurry can be injected in a timely manner through the grouting port of the conduit (7), and the cement slurry is injected into the crushed stone layer (5) through the slurry outlet of the conduit (7) to prevent the road surface (4) in the well perimeter area from settling again.

7. The anti-settlement method of the anti-settlement device around the well according to claim 6, characterized in that: In steps 3) and 4) above, if the thickness of the crushed stone layer (5) is relatively thick, at this time, a horizontal through hole (22) is drilled on the well wall (21) of the well chamber (2) and extends all the way into the crushed stone layer (5). By inserting a tube for injecting cement slurry into the horizontal through hole (22), cement slurry can be injected in a timely manner through this tube to overcome the re-settlement of the road surface in the well perimeter area caused by the thickness of the crushed stone layer.

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