Construction structure for prestressed anti-floating anchor rod in high backfill soil layer

Abstract

The utility model discloses a construction structure for a prestressed anti-floating anchor rod in a high backfill soil layer, which comprises a soil layer, an anchor rod structure, a mud jacking pipe, a cushion layer and a basement bottom plate, and an anchor rod body and a follow-up mounting part are arranged in the anchor rod structure; the soil layer is divided into a to-be-excavated layer located on the upper portion and a permanent layer located on the lower portion, anchor holes are drilled in the soil layer and extend to the permanent layer from the to-be-excavated layer, and anchor rod bodies are arranged in the anchor holes; the length of the anchor rod body is determined according to the design position of the basement bottom plate and the depth of the anchor hole; the grouting pipe is installed on the anchor rod body, and the anchor hole is filled with the standing mortar; the cushion layer is laid on the upper surface of the permanent layer, and the middle of the anchor rod body is fixed to the cushion layer. Subsequent installation components are installed on the anchor rod body, a basement bottom plate is poured on the upper portion of the cushion layer, and the upper portion of the anchor rod structure and the basement bottom plate are poured into a whole. The waiting time of the cement paste age is effectively shortened, and the basement construction period is effectively shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of basement anti - floating anchor rod construction, in particular to a construction structure for prestressed anti - floating anchor rods in high backfill soil layers. Background Technique

[0002] The traditional construction sequence of basement prestressed anti - floating anchor rods is to construct the basement anti - floating anchor rods after the basement earthwork excavation is completed, then pour the cushion layer. After the age of the cement paste in the anchor rod structure reaches for prestress tensioning, the basement floor structure can be constructed. Since it takes a long time for the cement paste in the anchor rod structure to reach the design - required age, the construction of the basement structure cannot be carried out in time, seriously affecting the construction period of the basement structure. Therefore, it is necessary to improve the traditional prestressed anchor rod construction method so that it can be constructed in advance before the earthwork excavation in the high backfill area, thereby shortening the waiting time for the age of the cement paste and reducing the project construction period. Content of the Utility Model

[0003] In view of the above - mentioned defects existing in the prior art, a construction structure for prestressed anti - floating anchor rods in high backfill soil layers is provided, which completes the anchor rod construction before the basement construction, effectively reducing the basement construction time.

[0004] The technical solution adopted by the utility model to solve the above - mentioned technical problems is as follows:

[0005] A construction structure for prestressed anti - floating anchor rods in high backfill soil layers, characterized in that: it includes a soil layer, an anchor rod structure, a grouting pipe, a cushion layer, and a basement floor. The anchor rod structure is provided with an anchor rod body and subsequent installation components; the soil layer is divided into an upper layer to be excavated and a lower permanent layer. An anchor hole is drilled in the soil layer, and the anchor hole extends from the layer to be excavated to the permanent layer. The anchor rod body is placed in the anchor hole, the lower part of the anchor rod body is located in the anchor hole of the permanent layer, and the upper part is located in the layer to be excavated; the length of the anchor rod body is determined according to the design position of the basement floor and the depth of the anchor hole; the grouting pipe is installed on the anchor rod body, and static mortar is filled in the anchor hole; the cushion layer is laid on the upper surface of the permanent layer, and the middle part of the anchor rod body is fixed on the cushion layer; subsequent installation components are installed on the anchor rod body, the basement floor is poured on the upper part of the cushion layer, and the upper part of the anchor rod structure and the basement floor are poured as a whole.

[0006] According to the above - mentioned technical solution, the anchor rod structure includes an anchor rod body, a lower prestressed anchor plate arranged at the bottom end of the anchor rod body, an upper prestressed anchor plate arranged at the top end of the anchor rod body, and a prestressed anchor backing plate fixedly connected to the middle part of the anchor rod body; the cushion layer is located between the permanent layer and the prestressed anchor backing plate, and the prestressed anchor backing plate is attached to the upper surface of the cushion layer; the lower prestressed anchor plate is located in the slurry in the anchor hole of the permanent layer, and the upper prestressed anchor plate is located in the basement floor.

[0007] According to the above technical solution, the upper surface of the upper prestressed anchorage plate and the end of the anchor rod body are not less than 50 mm lower than the upper surface of the basement floor.

[0008] According to the above technical solution, the anchor rod structure further includes a conical centering carrier, and a plurality of conical centering carriers are arranged on the rod body at intervals; a card slot for installing a grouting pipe is further provided on each conical centering carrier.

[0009] According to the above technical solution, the prestressed anchor plate includes a locking bolt and an anchor plate. The anchor plate is sleeved on the anchor rod body, and the anchor plate is located above the cushion layer; the locking nut is tightened on the anchor rod body, and the locking nut abuts against the upper surface of the anchor plate.

[0010] According to the above technical solution, a spiral stirrup is provided between the locking nut and the upper prestressed anchorage plate. The spiral stirrup is sleeved on the anchor rod body in a compressed state, and both ends abut between the anchor plate and the upper prestressed anchorage plate.

[0011] According to the above technical solution, it further includes a water-swelling water-stop rubber ring. The water-swelling water-stop rubber ring has a trumpet-shaped structure with a smaller bottom and a larger top; the water-swelling water-stop rubber ring is sleeved on the anchor rod body, the bottom end of the water-swelling water-stop rubber ring fits on the locking nut, and the top end of the water-swelling water-stop rubber ring is not higher than the height of the upper surface of the basement floor.

[0012] According to the above technical solution, the top 5 m of the anchor rod body is the free section, and a heat-shrinkable non-bonding sleeve is provided on its surface; the lower part of the free section of the anchor rod body is in direct contact with the grout, and an epoxy coating is applied on its surface.

[0013] According to the above technical solution, it further includes a suspension bar. The suspension bar is tied to the top end of the anchor rod body, and the anchor rod body is released into the anchor hole by the suspension bar.

[0014] The utility model has the following beneficial effects:

[0015] 1. According to the construction depth of the basement floor, the soil layer is divided into an excavation layer to be excavated and a permanent layer. Before excavating the soil layer, anchor holes are drilled in the soil layer; grout is poured into the anchor holes. Subsequently, excavation operations are carried out on the excavation layer to be excavated. After the excavation layer to be excavated is cleaned up, the grout in the area above the permanent layer of the anchor rod is cleaned, and the cushion layer is constructed on the upper surface of the permanent layer. The middle part of the anchor rod body is fixed on the cushion layer through the subsequent installation components. Finally, the basement floor is constructed above the cushion layer, and the basement floor and the upper part area of the anchor rod body are poured into a whole with the subsequent installation components.

[0016] Based on the above structure, before the earthwork excavation, directly form holes on the natural ground, embed the prestressed anchor rod body in advance, and complete the grouting, without waiting for the completion of the basement earthwork excavation before construction; compared with the construction operation of embedding anchor rods after excavating the earthwork in the prior art, it effectively shortens the waiting time for the cement slurry age period and effectively reduces the construction period of the basement.

[0017] 2. A nut, spiral stirrups, and an upper prestressed anchorage plate are provided in the basement floor slab. The nut, spiral stirrups, and upper prestressed anchorage plate share the tensile force transmitted by the anchor rod body, thereby avoiding excessive stress concentration of the anchor rod body in the basement floor slab and avoiding cracking of the concrete at the anchor rod body of the basement floor slab.

[0018] The above description is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the present invention and implement it in accordance with the content of the specification, the following describes in detail with reference to the preferred embodiments of the present invention and the accompanying drawings. The specific implementation manner of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0020] Figure 1 is a schematic structural diagram before excavation of the excavation area provided by the embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram after the construction of the basement floor slab provided by the embodiment of the present invention;

[0022] In the figure, 1. soil layer; 1-1. layer to be excavated; 1-2. permanent layer; 2. anchor structure; 2-1. anchor rod body; 2-2. lower prestressed anchorage plate; 2-3. upper prestressed anchorage plate; 2-4. locking bolt; 2-5. anchor backing plate; 2-6. spiral stirrups; 2-7. conical centering carrier; 3. grouting pipe; 4. cushion; 5. basement floor slab; 6. anchor hole; 7. water-swellable water-stop rubber ring; 8. suspension reinforcement. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following is combined with the attached Figure 1-2The principles and features of the present utility model are described. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model. In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the accompanying drawings. According to the following description and the claims, the advantages and features of the present utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0024] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used herein in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] Refer to Figures 1 to 2 As shown, the present utility model provides a construction structure for prestressed anti-floating anchor rods in high backfill soil layers.

[0027] Embodiment 1

[0028] It includes soil layer 1, anchor rod structure 2, grouting pipe 3, cushion layer 4, and basement floor slab 5. The anchor rod structure is provided with an anchor rod body 2-1 and subsequent installation components; the soil layer is divided into an upper to-be-excavated layer 1-1 and a lower permanent layer 1-2. An anchor hole 6 is drilled in the soil layer, and the anchor hole extends from the to-be-excavated layer to the permanent layer. The anchor rod body is placed in the anchor hole. The lower part of the anchor rod body is located in the anchor hole of the permanent layer, and the upper part is located in the to-be-excavated layer; the length of the anchor rod body is determined according to the designed position of the basement floor slab and the depth of the anchor hole; the grouting pipe is installed on the anchor rod body, and static mortar is filled in the anchor hole; the cushion layer is laid on the upper surface of the permanent layer, and the middle part of the anchor rod body is fixed on the cushion layer; subsequent installation components are installed on the anchor rod body, and the basement floor slab is poured on the upper part of the cushion layer, and the upper part of the anchor rod structure and the basement floor slab are poured as a whole.

[0029] In this embodiment, according to the construction depth of the basement floor slab, the soil layer is divided into an excavation layer and a permanent layer. Before excavating the soil layer, anchor holes are drilled in the soil layer; grout is poured into the anchor holes. Subsequently, excavation operations are carried out on the excavation layer of the soil layer. After the excavation layer is cleared, the grout in the area of the anchor rod above the permanent layer is cleared, and the construction of the cushion is carried out on the upper surface of the permanent layer. The middle part of the anchor rod body is fixed on the cushion through the subsequent installation components. Finally, the basement floor slab is constructed above the cushion, and the basement floor slab and the upper part area of the anchor rod body are cast into a whole with the subsequent installation components.

[0030] Based on the above structure, before earth excavation, holes are directly drilled on the natural ground, the prestressed anchor rod body is buried in advance, and grouting is completed, without waiting for the completion of the basement earth excavation before construction; compared with the construction operation of embedding anchor rods after earth excavation in the prior art, the waiting time for the age of the cement grout is effectively shortened, and the construction period of the basement is effectively reduced.

[0031] In Embodiment 1, the anchor rod structure includes an anchor rod body, a lower prestressed anchoring plate 2-2 provided at the bottom end of the anchor rod body, an upper prestressed anchoring plate 2-3 provided at the top end of the anchor rod body, and prestressed anchor pads 2-4 and 2-5 fixedly connected to the middle part of the anchor rod body; the cushion is located between the permanent layer and the prestressed anchor pads, and the prestressed anchor pads are attached to the upper surface of the cushion; the lower prestressed anchoring plate is located in the grout in the anchor hole of the permanent layer, and the upper prestressed anchoring plate is located in the basement floor slab. Through the upper and lower prestressed anchoring plates and the anchor rod body, the basement floor slab and the soil layer of the permanent layer are connected together, playing a role in anti-floating of the basement.

[0032] Embodiment 2

[0033] The structure and principle of Embodiment 2 are similar to those of Embodiment 1. The difference lies in that: the anchor rod structure further includes a conical centering carrier 2-7, and a plurality of conical centering carriers are arranged at intervals on the rod body; a slot for installing a grouting pipe is also provided on each conical centering carrier. The purpose of setting the conical centering carriers is, on the one hand, to ensure that the anchor rod body is in the central position, and on the other hand, to clamp the grouting pipe, and the cement grout is injected into the hole through the grouting pipe to form a cement grout body.

[0034] In Embodiments 1 and 2, the prestressed anchor pad includes a locking bolt 2-4 and an anchor pad 2-5. The anchor pad is sleeved on the anchor rod body, and the anchor pad is located above the cushion; the locking nut is tightened on the anchor rod body, and the locking nut abuts against the upper surface of the anchor pad. After the anchor rod body is tensioned, the locking of the tensioned prestress is realized by tightening the locking nut.

[0035] Preferably, the upper surface of the upper prestressed anchoring plate and the end of the anchor rod body are not less than 50 mm lower than the upper surface of the basement floor slab.

[0036] Example 3

[0037] The structure and principle of Example 3 are similar to those of Example 1. The differences are as follows: To improve the anchoring strength of the top of the anchor rod body and the upper prestressed anchoring plate in the basement floor, a spiral stirrup 2-6 is provided between the locking nut and the upper prestressed anchoring plate. The spiral stirrup is sleeved on the anchor rod body in a compressed state, and both ends abut between the anchor backing plate and the upper prestressed anchoring plate. After the nut, the spiral stirrup, and the upper prestressed anchoring plate are cast integrally with the basement floor, the nut, the spiral stirrup, and the upper prestressed anchoring plate share the tensile force transmitted by the anchor rod body, thus avoiding excessive stress concentration of the anchor rod body in the basement floor and preventing the concrete at the position of the anchor rod body on the basement floor from cracking.

[0038] In Examples 1-3, a water-swelling water-stop rubber ring 7 is further included. The water-swelling water-stop rubber ring has a trumpet-shaped structure with a smaller bottom and a larger top. The water-swelling water-stop rubber ring is sleeved on the anchor rod body. The bottom end of the water-swelling water-stop rubber ring fits on the locking nut, and the top end of the water-swelling water-stop rubber ring is not higher than the upper surface of the basement floor. By arranging the water-swelling water-stop rubber ring outside the anchor rod body in the basement floor, the functions of water stopping and preventing stress concentration are achieved.

[0039] In Examples 1-3, the top 5m of the anchor rod body is the free section, and a heat-shrinkable non-bonding sleeve is provided on its surface. The lower part of the free section of the anchor rod body is in direct contact with the grout, and an epoxy coating is applied on its surface.

[0040] In Examples 1-3, since the length of the anchor rod body is less than the depth of the anchor hole, a hanger bar 8 is further included. The hanger bar is tied to the top end of the anchor rod body, and the anchor rod body is released into the anchor hole by the hanger bar. In the illustrated example, the hanger bar is a 2mm steel wire rope.

[0041] The implementation steps of the construction structure recorded in the present utility model are as follows:

[0042] Step 1: Use a spiral drill and a down-the-hole drill to directly form a hole on the natural ground. After the hole is formed, use high-pressure air to clean the floating slag. The hole cleaning time is not less than 3 minutes. Then, use the hanger bar to put the assembled anchor rod body, lower prestressed anchoring plate, conical centering carrier, and grouting pipe assembly into the hole, and control the elevation of the top of the anchor rod body through the length of the hanger bar;

[0043] Step 2: Inject cement slurry into the hole through the grouting pipe. The slurry fills the entire hole from the bottom opening of the drill hole outwards in sequence and presses out the air in the hole to form a cement slurry body;

[0044] Step 3: Excavate the soil layer above the bottom of the cushion in layers and pour the cushion;

[0045] Step 4: Embed the prestressed anchor plate above the cushion layer, and tighten the locking nut after applying prestress.

[0046] Step 5: Install the spiral stirrups and the water-swelling water-stop rubber ring, tighten the upper prestressed anchorage plate, and pour the basement floor slab.

[0047] The above is only the preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any person skilled in the art can smoothly implement the present invention according to the illustrations in the specification and the above description. However, any equivalent changes made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above, such as minor modifications, decorations, and evolutions, are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. The construction structure of prestressed anti-floating anchor rods used in high backfill soil layers is characterized by: It includes a soil layer, an anchor rod structure, a grouting pipe, a cushion layer, and a basement floor slab, wherein an anchor rod body and subsequent installation components are arranged in the anchor rod structure; the soil layer is divided into an upper layer to be excavated and a lower permanent layer, anchor holes are drilled in the soil layer, and the anchor holes extend from the layer to be excavated to the permanent layer, and the anchor rod body is placed in the anchor hole, and the lower part of the anchor rod body is located in the anchor hole of the permanent layer, and the upper part is located in the layer to be excavated; the grouting pipe is installed on the anchor rod body, and static mortar is filled in the anchor hole; the cushion layer is laid on the upper surface of the permanent layer, and the middle part of the anchor rod body is fixed on the cushion layer; subsequent installation components are installed on the anchor rod body, and the basement floor slab is cast on the upper part of the cushion layer, and the upper part of the anchor rod structure and the basement floor slab are cast as a whole.

2. The construction structure of the prestressed anti-floating anchor rod in the high backfill soil layer according to claim 1 is characterized in that: The anchor rod structure includes an anchor rod body, a lower prestressed anchor plate arranged at the bottom end of the anchor rod body, an upper prestressed anchor plate arranged at the top end of the anchor rod body, and a prestressed anchor pad fixedly connected to the middle part of the anchor rod body; the cushion layer is located between the permanent layer and the prestressed anchor pad, and the prestressed anchor pad is attached to the upper surface of the cushion layer; the lower prestressed anchor plate is located in the slurry in the anchor hole of the permanent layer, and the upper prestressed anchor plate is located in the basement floor.

3. The construction structure of the prestressed anti-floating anchor rod in the high backfill soil layer according to claim 2 is characterized in that: The upper surface of the upper prestressed anchor plate and the end of the anchor rod body shall be at least 50mm lower than the upper surface of the basement floor.

4. The construction structure of the prestressed anti-floating anchor rod in the high backfill soil layer according to claim 2 is characterized in that: The anchor rod structure also includes a conical centering bearing body, and a plurality of conical centering bearing bodies are arranged on the rod body at intervals; each conical centering bearing body is also provided with a slot for inserting a grouting pipe.

5. The construction structure of prestressed anti-floating anchor rods in high backfill soil layers according to claim 2 or 4, characterized in that: The prestressed anchor plate comprises a locking bolt and an anchor plate, wherein the anchor plate is sleeved on the anchor rod body and located on the upper part of the cushion layer; the locking nut is tightened on the anchor rod body and the locking nut abuts against the upper surface of the anchor plate.

6. The construction structure of the prestressed anti-floating anchor rod used in high backfill soil layer according to claim 5 is characterized in that: A spiral stirrup is arranged between the locking nut and the upper prestressed anchor plate. The spiral stirrup is sleeved on the anchor rod body in a compressed state, and the two ends of the spiral stirrup are abutted between the anchor pad and the upper prestressed anchor plate.

7. The construction structure of the prestressed anti-floating anchor rod in the high backfill soil layer according to claim 1 is characterized in that: It also includes a water-swellable water-stop rubber ring, which has a trumpet-shaped structure that is small at the bottom and large at the top; the water-swellable water-stop rubber ring is sleeved on the anchor rod body, the bottom end of the water-swellable water-stop rubber ring is fitted on the locking nut, and the top end of the water-swellable water-stop rubber ring is not higher than the height of the upper surface of the basement floor.

8. The construction structure of the prestressed anti-floating anchor rod used in high backfill soil layer according to claim 1 is characterized in that: The top 5m of the anchor rod body is a free section, on the surface of which a heat-shrinkable non-adhesive sleeve is provided; the lower part of the free section of the anchor rod body is in direct contact with the slurry, and an epoxy coating is applied on its surface.

9. The construction structure of the prestressed anti-floating anchor rod used in high backfill soil layer according to claim 1, characterized in that: It also includes a hanging rod, which is tied to the top of the anchor rod body and releases the anchor rod body into the anchor hole through the hanging rod.

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