Structure for preventing well lid from settling

Abstract

The utility model discloses a structure for avoiding well lid sedimentation and belongs to the field of municipal drainage engineering. The structure comprises a shaft, a mortar layer is arranged on the top of the shaft, a cement concrete layer is arranged on the top of the mortar layer, the inner diameter of the mortar layer is smaller than that of the cement concrete layer, and a sleeve is installed on the inner side. The outer wall of the sleeve is attached to the inner wall of each layer, the top walling crib is fixed to the cement concrete layer through high-strength expansion bolts, a pull rod is embedded in the cement concrete layer and inserted into a sleeve clamping groove, the lower portion of the sleeve is fixed to the shaft through expansion bolts, and a rubber ring is arranged on an inner wall step-shaped installation table to install the well lid. And graded broken stones are backfilled within 1m of the periphery of the shaft. According to the structure, the well lid is reliably connected with a shaft and a pavement base layer through the high-strength expansion bolts and the pull rods to form a unified whole, stability is enhanced, differential settlement and abnormal sound are reduced, meanwhile, sealing and damping are achieved through the rubber rings, and durability is improved.

Description

A structure to prevent manhole cover settlement Technical Field

[0001] This utility model belongs to the field of municipal drainage engineering construction technology, and specifically relates to a structure to prevent manhole cover settlement. Background Technology

[0002] Currently, the most widely adopted type of manhole cover in municipal drainage engineering is the inverted bearing anti-settlement manhole cover. This type of cover has advantages such as high weight and easy installation. At the same time, its installation is a crucial step in municipal drainage engineering construction. Existing construction methods typically involve directly placing the manhole cover onto the manhole casing using mortar, and then laying asphalt concrete after the mortar reaches its designed strength. Because asphalt concrete is a flexible material, and the strength of the mortar is much lower than that of commercial concrete, long-term exposure to vehicle traffic often leads to the manhole cover settling, or even abnormal noise and deformation. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a structure that avoids manhole cover settlement. The structure is reasonably designed and uses high-strength expansion bolts and fixed tie rods to reliably connect the manhole cover structure to the manhole and the road base, thereby reducing problems such as manhole cover settlement and deformation.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A structure for preventing manhole cover settlement includes a manhole casing, a mortar layer at the top of the manhole casing, and a cement concrete layer at the top of the mortar layer, the inner diameter of the mortar layer being smaller than the inner diameter of the cement concrete layer; a sleeve is installed inside the manhole casing, the mortar layer, and the cement concrete layer.

[0006] Preferably, the outer wall of the sleeve is in contact with the inner wall of the well shaft, mortar layer, and cement concrete layer.

[0007] Preferably, the inner diameter of the mortar layer is equal to the inner diameter of the well shaft.

[0008] Preferably, an asphalt concrete layer is provided on top of the cement concrete layer.

[0009] Preferably, the inner diameter of the asphalt concrete layer is larger than the inner diameter of the cement concrete layer.

[0010] Preferably, the sleeve has a multi-fold cylindrical structure, and a well ring is provided at the top of the sleeve, which is flush with the asphalt concrete layer.

[0011] Preferably, the well ring is fixed to the cement concrete layer by high-strength expansion bolts.

[0012] Preferably, a tie rod is pre-embedded in the cement concrete layer, with the end of the tie rod protruding from the inner wall of the cement concrete layer and the tie rod inserted into the groove on the outer wall of the sleeve.

[0013] Preferably, the lower part of the sleeve is fixed to the wellbore by high-strength expansion bolts.

[0014] Preferably, the inner wall of the sleeve forms a stepped manhole cover mounting platform for installing the manhole cover, and a rubber ring is provided between the manhole cover and the sleeve.

[0015] The present invention can achieve the following beneficial effects:

[0016] The manhole is backfilled with graded crushed stone within 1m of the manhole shaft, which can avoid the settlement of the manhole caused by water and soil erosion when using backfill soil; by connecting the manhole cover structure with the manhole and the concrete pavement, the pavement structure within the manhole cover area can be made into a unified whole, which can enhance its stability and reliability; it can effectively reduce the uneven settlement of the manhole cover and prevent problems such as abnormal noise from the manhole cover. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1. Well shaft; 2. Rubber ring; 3. Mortar layer; 4. Well ring; 5. Sleeve; 6. Crushed stone layer; 7. Tie rod; 8. Cement concrete layer; 9. Asphalt concrete layer; 10. High-strength expansion bolt; 11. Well cover. Detailed Implementation

[0020] As shown in Figure 1, a preferred embodiment of a structure for preventing manhole cover settlement includes a manhole casing 1, a mortar layer 3 on top of the manhole casing 1, and a cement concrete layer 8 on top of the mortar layer 3. The inner diameter of the mortar layer 3 is smaller than the inner diameter of the cement concrete layer 8. A sleeve 5 is installed inside the manhole casing 1, the mortar layer 3, and the cement concrete layer 8.

[0021] Within 1m of the outer perimeter of the manhole casing 1 and below the cement concrete layer 8, 20cm graded crushed stone was used for backfilling, thus forming the crushed stone layer 6. 20cm graded crushed stone was backfilled to the upper edge of the manhole casing and compacted to ensure that the manhole itself did not settle.

[0022] Furthermore, the outer wall of the sleeve 5 is bonded to the inner walls of the well shaft 1, the mortar layer 3, and the cement concrete layer 8.

[0023] Furthermore, the inner diameter of mortar layer 3 is equal to the inner diameter of well shaft 1.

[0024] The cement:sand:water ratio should be between 1:1.5:0.25-0.4.

[0025] Furthermore, an asphalt concrete layer 9 is provided on top of the cement concrete layer 8. The asphalt concrete layer 9 is generally the pavement structure of municipal roads. The inner diameter of the asphalt concrete layer 9 is larger than the inner diameter of the cement concrete layer 8.

[0026] Furthermore, the sleeve 5 has a multi-fold cylindrical structure, and a well ring 4 is provided at the top of the sleeve 5, which is flush with the asphalt concrete layer 9.

[0027] Eight high-strength expansion bolts are evenly arranged around the well circumference on sleeve 5. After the well ring and the well barrel mortar are fully bonded together, the well ring structure is fixed to the well barrel.

[0028] Furthermore, the well ring 4 is fixed to the cement concrete layer 8 by high-strength expansion bolts 10.

[0029] A tie rod 7 is pre-embedded in the cement concrete layer 8. The end of the tie rod 7 protrudes from the inner wall of the cement concrete layer 8 and is inserted into the groove on the outer wall of the sleeve 5.

[0030] Pour cement concrete layer 8 to fill the gap between the well ring wing plate and the well cylinder and vibrate it fully to ensure that the tie rod is reliably connected to the cement concrete layer 8; after the cement concrete layer 8 reaches the design strength, fix the well ring to the cement concrete layer 8 with expansion bolts; evenly arrange 8 high-strength expansion bolts on the well ring wing plate.

[0031] Specifically, the 8th layer of cement concrete is C25 cement concrete.

[0032] Furthermore, the lower part of the sleeve 5 is fixed to the wellbore 1 by high-strength expansion bolts 10. The high-strength expansion bolts and threaded steel tie rods are evenly arranged at 45° intervals around the well, with a total of 8 of them.

[0033] Furthermore, the inner wall of the sleeve 5 forms a stepped manhole cover mounting platform, on which the manhole cover 11 is mounted, and a rubber ring 2 is provided between the manhole cover 11 and the sleeve 5. The rubber ring 2 is a socket-type sealing rubber ring.

[0034] The bottom of mortar layer 3 is equipped with a socket-type sealing rubber ring to ensure that the well casing socket does not leak water and has sufficient strength to support the well cover structure.

[0035] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A structure for preventing manhole cover settlement, comprising a manhole casing (1), characterized in that: A mortar layer (3) is provided at the top of the well shaft (1), and a cement concrete layer (8) is provided at the top of the mortar layer (3). The inner diameter of the mortar layer (3) is smaller than the inner diameter of the cement concrete layer (8). A sleeve (5) is installed inside the well shaft (1), the mortar layer (3) and the cement concrete layer (8).

2. The structure for preventing manhole cover settlement according to claim 1, characterized in that: The outer wall of the sleeve (5) is bonded to the inner wall of the well shaft (1), the mortar layer (3) and the cement concrete layer (8).

3. The structure for preventing manhole cover settlement according to claim 1, characterized in that: The inner diameter of the mortar layer (3) is equal to the inner diameter of the well shaft (1).

4. The structure for preventing manhole cover settlement according to claim 1, characterized in that: An asphalt concrete layer (9) is provided on top of the cement concrete layer (8).

5. The structure for preventing manhole cover settlement according to claim 4, characterized in that: The inner diameter of the asphalt concrete layer (9) is larger than that of the cement concrete layer (8).

6. The structure for preventing manhole cover settlement according to claim 5, characterized in that: The sleeve (5) is a multi-fold cylindrical structure. A well ring (4) is provided at the top of the sleeve (5), and the well ring (4) is flush with the asphalt concrete layer (9).

7. The structure for preventing manhole cover settlement according to claim 6, characterized in that: The well ring (4) is fixed to the cement concrete layer (8) by high-strength expansion bolts (10).

8. The structure for preventing manhole cover settlement according to claim 1, characterized in that: A tie rod (7) is pre-embedded in the cement concrete layer (8). The end of the tie rod (7) protrudes from the inner wall of the cement concrete layer (8), and the tie rod (7) is inserted into the groove on the outer wall of the sleeve (5).

9. The structure for preventing manhole cover settlement according to claim 1, characterized in that: The lower part of the sleeve (5) is fixed to the wellbore (1) by high-strength expansion bolts (10).

10. A structure for preventing manhole cover settlement according to claim 1, characterized in that: The inner wall of the sleeve (5) forms a stepped manhole cover mounting platform, on which the manhole cover (11) is mounted, and a rubber ring (2) is provided between the manhole cover (11) and the sleeve (5).

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