CN210766868U

CN210766868U - Reinforcing structure for existing gravity retaining wall

Info

Publication number: CN210766868U
Application number: CN201921513181.2U
Authority: CN
Inventors: 朱胜祥; 郑晓静; 余小龙; 魏定邦; 张坤
Original assignee: Gansu Highway Construction Group Co Ltd
Current assignee: Gansu Highway Construction Group Co Ltd
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-06-16
Anticipated expiration: 2029-09-11

Abstract

The utility model provides a reinforced structure for existing gravity type barricade. The reinforced structure comprises a steel pipe-ground anchor combined structure and a crown beam, wherein the steel pipe-ground anchor combined structure comprises a drill hole vertically drilled from the top surface of the existing gravity type retaining wall to a stratum below a retaining wall foundation, a steel pipe inserted in the drill hole and a prestressed anchor rod or anchor cable penetrating through the steel pipe, the upper part of the steel pipe is higher than the top surface of the retaining wall and extends into the crown beam on the top surface of the wall body, the lower part of the steel pipe penetrates through the retaining wall foundation, and the insertion depth is smaller than the drilling depth of the drill hole; the prestressed anchor rod or the anchor cable comprises an anchoring section, a free section and an anchor head, wherein the anchoring section is positioned at the middle lower part of the drill hole, and the anchor head is arranged above the crown beam. The utility model discloses in require to be lower to the construction space, be applicable to the narrow and small condition in face space that is in the air, this reinforced structure has increased the wholeness of gravity type barricade and the anti ability of sliding, antidumping of existing gravity type barricade to make full use of original barricade and resisted soil pressure, avoid the wasting of resources.

Description

Reinforcing structure for existing gravity retaining wall

Technical Field

The patent of the utility model relates to a geotechnical engineering field specifically is to provide a reinforced structure for existing gravity type barricade, and this reinforced structure adopts the flexible reinforcement system that steel pipe and earth anchor combine to consolidate to rigidity gravity type retaining wall, increases its deformability, increases anti the sliding of existing gravity type barricade simultaneously, the ability of antidumping.

Background

Gravity type retaining wall refers to the retaining wall that relies on wall body dead weight to resist soil body lateral pressure. The gravity type retaining wall can use block stones, sheet stones and concrete precast blocks as masonry, or adopt sheet stone concrete and concrete to perform integral casting, and the application is very wide. However, due to the long time of the year or the change of load and surrounding environment, the original stable gravity retaining wall may crack, arch, slide, partially slide, collapse, or even topple, so that a large amount of existing gravity retaining walls need to be reinforced.

At present, the existing gravity retaining wall is reinforced by a reinforcement method of a sash beam anchor rod (cable), the integrity of the gravity retaining wall is increased by adding a sash beam outside the retaining wall, and the soil pressure of a side slope is balanced by the anchoring force of the anchor rod (cable). The main drawbacks of this technique are: (1) the requirement on the space of a free face is large during construction, and enough space is needed for building a scaffold and carrying out construction operations such as anchor rod (cable) penetration, grouting, formwork support, reinforcing steel bar binding, concrete pouring, prestress application and the like. (2) The requirement for rock-soil mass behind the retaining wall is high, the anchoring provided by the rock-soil mass is enough to balance the soil pressure behind the wall, and the rock-soil mass is not generally suitable for untreated loose rock-soil mass behind the wall. (3) The reinforcement method completely ignores the action of the existing retaining wall on resisting soil pressure, and leads the retaining wall to be a part of the slope rock-soil body, thus causing resource waste.

Disclosure of Invention

The utility model discloses not enough according to prior art provides a reinforced structure for existing gravity type barricade, and this reinforced structure is that steel pipe-earth anchor integrated configuration and crown beam make up and form, can consolidate to existing gravity type barricade that the face aperture is narrow and small to can increase the wholeness of gravity type barricade, increase the anti ability of sliding, the antidumping of existing gravity type barricade, can also the original barricade of make full use of resist soil pressure, avoid the wasting of resources.

In order to solve the technical problem, the utility model provides a technical scheme specifically as follows: the reinforcing structure for the existing gravity retaining wall comprises a steel pipe-ground anchor combined structure and a crown beam, wherein the steel pipe-ground anchor combined structure is vertically constructed in an existing gravity retaining wall body, the crown beam is arranged on the top surface of the existing gravity retaining wall body, the steel pipe-ground anchor combined structure comprises a drill hole, a steel pipe and a prestressed anchor rod or anchor cable, the drill hole is vertically drilled from the top surface of the existing gravity retaining wall to a stratum below a retaining wall foundation, the steel pipe is inserted into the drill hole, the prestressed anchor rod or anchor cable penetrates through the steel pipe, the upper portion of the steel pipe is higher than the top surface of the retaining wall and extends into the crown beam, the lower portion of the steel pipe penetrates through the retaining wall foundation, and the insertion depth; the prestressed anchor rod or the anchor cable comprises an anchoring section, a free section and an anchor head, wherein the anchoring section is positioned at the middle lower part of the drill hole, and the anchor head is arranged above the crown beam.

The utility model discloses better technical scheme: the reinforced structure comprises a plurality of steel pipe-ground anchor combined structures, the steel pipe-ground anchor combined structures are distributed at equal intervals along the length range of the existing gravity type retaining wall, the crown beam covers the steel pipe-ground anchor combined structures, and the upper end of the steel pipe of each steel pipe-ground anchor combined structure extends into the crown beam.

The utility model discloses further technical scheme: the lower part of the steel pipe is provided with a plurality of grouting holes, the length of each grouting hole does not exceed 1/2 of the total length of the steel pipe, and the diameter of each grouting hole is 3-5 mm.

The utility model discloses better technical scheme: the drilling depth of the drill hole is at least 5m below the foundation of the retaining wall; the steel pipe is inserted into the drill hole in the construction drilling process by adopting a pipe following drilling mode, and the insertion depth of the steel pipe is at least 0.5m below the foundation of the retaining wall.

The utility model discloses better technical scheme: the anchoring section of the prestressed anchor rod or the anchor cable comprises a grouting part arranged below the steel pipe and a grouting part arranged in the area range of the steel pipe provided with the grouting hole.

(1) The reinforcing structure is formed by combining a steel pipe-ground anchor combined structure and a crown beam, and compared with a reinforcing system formed by ground anchors, the steel pipe of the reinforcing structure has certain flexibility and allows large deformation;

(2) the reinforced structure in the utility model is directly formed by construction after drilling is vertically started from the wall top of the existing retaining wall, so the requirement on construction space is lower, and the reinforced structure is suitable for the situation that the space of a free surface is narrow, a scaffold is not enough, and construction operations such as anchor rod (cable) penetration, grouting, formwork erecting, steel bar binding, concrete pouring, prestress application and the like are not enough;

(3) the utility model can be used for untreated loose rock-soil mass behind the retaining wall, and the integrity of the gravity retaining wall is increased through the steel pipe and the crown beam; the anti-sliding and anti-overturning capability of the existing gravity retaining wall is improved through the ground anchor (or the prestressed ground anchor); the original retaining wall is fully utilized to resist soil pressure, and resource waste is avoided; the construction process is simple;

(4) the steel pipe of the utility model is a hollow structure, and the lower part of the steel pipe forms a similar steel pipe-concrete combined structure after the lower part is grouted, namely the steel pipe is mainly wrapped with mortar, which can resist larger bending moment, shearing force and axial force; and the lower part of the steel pipe is provided with a grouting hole, so that grouting can be performed into a drilling hole at the back of the steel pipe through the grouting hole at the lower part of the steel pipe, a gap in the retaining wall is filled, and the stability of the steel pipe is improved.

Drawings

FIG. 1 is a cross-sectional view of the reinforcing structure of the present invention reinforcing an existing gravity retaining wall;

FIG. 2 is an elevation view of the reinforcing structure of the present invention reinforcing an existing gravity retaining wall;

FIG. 3 is a schematic structural view of the reinforcement system of the present invention;

fig. 4 is a schematic diagram of the steel pipe structure of the present invention.

In the figure: 1-existing gravity retaining wall, 2-drilling, 3-steel pipe, 3-1-grouting hole, 4-prestressed anchor rod or anchor cable, 4-1-anchoring section, 4-2-free section, 4-3-anchor head, 5-retaining wall foundation, 6-crown beam, 7-building and 8-slope top.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Fig. 1 to 4 are drawings of the embodiment, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the purpose of the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In an embodiment, a reinforcing structure for an existing gravity retaining wall is provided, as shown in fig. 1, for reinforcing the existing gravity retaining wall, and the reinforcing structure is characterized in that: the reinforced structure comprises a steel pipe-ground anchor combined structure which is vertically constructed in the wall body of the existing gravity type retaining wall 1 and a crown beam 6 which is arranged on the top surface of the wall body of the existing gravity type retaining wall 1, as shown in figure 2, the reinforced structure comprises a plurality of steel pipe-ground anchor combined structures, the steel pipe-ground anchor combined structures are distributed at equal intervals along the length range of the existing gravity type retaining wall 1, and the crown beam 6 covers the steel pipe-ground anchor combined structures and is transversely connected into a whole.

As shown in fig. 1 and 3, each steel pipe-ground anchor combined structure includes a bore hole 2 drilled vertically from the top surface of an existing gravity type retaining wall 1 to a ground layer below a retaining wall foundation 5 by at least 5m, a steel pipe 3 inserted in the bore hole 2, and a prestressed anchor rod or cable 4 constructed in the steel pipe 3, the upper portion of the steel pipe 3 being higher than the top surface of the retaining wall, and extends into the crown beam 6, the lower part of the crown beam penetrates through the lower part of the retaining wall foundation 5 by at least 0.5m, the insertion depth is less than the drilling depth of the drilling hole 2, when a rock layer is below the retaining wall foundation 5, the depth of the drilled hole is 5-8 m below the retaining wall foundation 5, the insertion depth of the steel pipe 3 is 0.5-1 m below the retaining wall foundation 5, when the soil layer is below the retaining wall foundation 5, the drilling depth is 8-15 m below the retaining wall foundation 5, and the insertion depth of the steel pipe 3 is 3-5 m below the retaining wall foundation 5. The prestressed anchor rod or anchor cable 4 comprises an anchoring section 4-1, a free section 4-2 and an anchor head 4-3, wherein the anchoring section 4-1 is positioned at the middle lower part of the drill hole 2, and the anchor head 4-3 is arranged above the crown beam 6. In general, a prestressed anchor cable is preferably used, wherein the anchor cable consists of a steel strand, a wire stringing ring, a hooping ring and a guide cap, the anchor head comprises a bearing plate, an anchor and anchor-sealing concrete, the upper end of the steel strand extends out of the steel pipe 3 and penetrates through the bearing plate to be anchored at the top of the crown beam 6 through the anchor, and finally the concrete is poured and anchored at the top of the crown beam 6 to form the anchor head; the guide cap is arranged at the bottom of the steel strand, the wire erecting ring, the hoop ring and the guide cap are combined into an anchor cable, the lower end of the anchor cable penetrates through the steel pipe 3 after hole forming and extends into a drilled hole below the steel pipe 3, then grouting is carried out to form an anchoring section 4-1, and the steel strand arranged between the anchoring body 4-1 and the crown beam 6 is a free section of the anchor cable.

To some retaining walls of ages of a long time, the broken condition can appear when drilling, in addition drilling vibration influences, easily causes gravity type retaining wall not hard up, and the space is great, can process into the slip casting steel pipe with 3 lower part drilling of steel pipe, adopts the slip casting mode to fill the inside space of retaining wall. Specifically, as shown in fig. 4, a plurality of grouting holes 3-1 are formed in the lower portion of the steel pipe 3, the length of each grouting hole 3-1 is no more than 1/2 of the total length of the steel pipe 3, and the diameter of each grouting hole 3-1 is 3-5 mm. The anchoring section 4-1 of the prestressed anchor rod or the anchor cable 4 comprises a grouting part arranged below the steel pipe 3 and a grouting part arranged in the area range of the steel pipe 3 provided with the grouting hole 3-1.

The construction process of the present invention will be further described with reference to specific construction examples, the construction project aims at the existing gravity retaining wall in a certain area, the retaining wall has poor stability due to long time, and the retaining wall needs to be reinforced in order to ensure the stability thereof; but this existing gravity retaining wall's domatic building 7 that closes on, it is small and small in the face space that is in the air, does not have sufficient space to set up the scaffold frame and wear the anchor pole (cable), slip casting, formwork, ligature reinforcing bar, concreting, the condition of applying construction operations such as prestressing force, so adopts the utility model provides a steel pipe-flexible reinforcement system of earth anchor combination is consolidated it, and its concrete construction step is as follows:

(1) drilling: drilling is vertically started from the top of the existing gravity type retaining wall 1 until the top penetrates at least 5m below a retaining wall foundation 5, steel pipes 3 are placed in a drill hole 2 in a pipe following drilling mode, specifically, after the steel pipes are drilled to a certain depth, the drill is lifted out, the next steel pipe is placed, and then the drilling is repeated, the steel pipes are connected into a whole in a mechanical or welding mode, for the condition that the wall is relatively intact, holes can be formed firstly, the whole steel pipe is placed after the holes are formed, the upper ends of the steel pipes 3 are higher than the top of the retaining wall, and the higher parts of the steel pipes are smaller than the design height of a crown beam 6, so that the steel pipes 3 are conveniently placed in the crown; the lower end of the steel pipe passes through the position below the retaining wall foundation 5 by at least 0.5m, the bottom of the steel pipe 3 is higher than the bottom of the drill hole 2, and the raised part is convenient for constructing an anchoring section; grouting holes 3-1 are formed in the areas 1/3-1/2 at the lower parts of the steel pipes 3;

(2) after the drilling 2 and the steel pipe 3 are constructed, an anchor cable is placed, wherein the anchor cable consists of a steel strand, a wire erecting ring, a hoop ring and a guide cap, the upper part of the steel strand of the anchor cable extends out of the top end of the steel pipe 3, and the extending part is larger than the design height of the crown beam 6;

(3) before the anchor cable is installed, a grouting pipe is tied to the anchor cable, after the anchor cable is installed in the step (2), grouting is conducted into the drill hole 2, grouting is conducted through the grouting pipe tied to the anchor cable, secondary splitting grouting is conducted after 24 hours, it is guaranteed that grouting on the lower portion of the soil body is full, the grouting height is not higher than the opening height of the steel pipe 3, an anchoring section 4-1 on the lower portion and a free section on the upper portion are formed in the drill hole 2, then prestress is applied to form a prestress anchor cable, and in the grouting process, grout can fill an inner gap of the retaining wall 1 caused by drilling through the grouting hole 3-1 in the steel pipe 3;

(4) repeating the steps (1) to (3) until the steel pipe-ground anchor combined structure in the length range of the existing retaining wall is completely finished, constructing a crown beam 6 on the wall top of the existing gravity retaining wall 1, wherein the upper part of each steel pipe 3 of the steel pipe-ground anchor combined structure extends into the crown beam 6, and connecting a plurality of steel pipe-ground anchor combined structures through the crown beam 6 to form a flexible reinforcing system;

(5) finally, a backing plate and an anchorage device are arranged at the position, corresponding to each steel pipe-ground anchor combined structure, of the top of the crown beam 6, anchor sealing concrete is poured, an anchor head of each steel pipe-ground anchor combined structure is constructed, and the whole reinforcing work is completed.

The reinforcement structure in implementation increases the integrity of the gravity type retaining wall through steel pipes and crown beams; the anti-sliding and anti-overturning capability of the existing gravity retaining wall is improved through the ground anchor (or the prestressed ground anchor); the original retaining wall is fully utilized to resist soil pressure, and resource waste is avoided; and the construction process is simple, and the reinforcing effect is good.

The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a reinforced structure for existing gravity type barricade which characterized in that: the reinforced structure comprises a steel pipe-ground anchor combined structure which is vertically constructed in the wall body of the existing gravity type retaining wall (1) and a crown beam (6) which is arranged on the top surface of the wall body of the existing gravity type retaining wall (1), wherein the steel pipe-ground anchor combined structure comprises a drilling hole (2) which is vertically drilled from the top surface of the existing gravity type retaining wall (1) to the stratum below a retaining wall foundation (5), a steel pipe (3) which is inserted in the drilling hole (2) and a prestressed anchor rod or anchor cable (4) which penetrates through the steel pipe (3), the upper part of the steel pipe (3) is higher than the top surface of the retaining wall and extends into the crown beam (6), the lower part of the steel pipe penetrates through the retaining wall foundation (5), and the insertion depth is smaller than the drilling depth of the drilling hole (2); the prestressed anchor rod or the anchor cable (4) comprises an anchoring section (4-1), a free section (4-2) and an anchor head (4-3), wherein the anchoring section (4-1) is positioned at the middle lower part of the drill hole (2), and the anchor head (4-3) is arranged above the crown beam (6).

2. A reinforced structure for an existing gravity retaining wall as claimed in claim 1, wherein: the reinforced structure comprises a plurality of steel pipe-ground anchor combined structures, the steel pipe-ground anchor combined structures are distributed at equal intervals along the length range of the existing gravity type retaining wall (1), the crown beam (6) covers the steel pipe-ground anchor combined structures, and the upper end of the steel pipe of each steel pipe-ground anchor combined structure extends into the crown beam (6).

3. A reinforced structure for an existing gravity retaining wall as claimed in claim 1 or 2, wherein: the lower portion of the steel pipe (3) is provided with a plurality of grouting holes (3-1), the length of each grouting hole (3-1) is no more than 1/2 of the total length of the steel pipe (3), and the diameter of an opening of each grouting hole (3-1) is 3-5 mm.

4. A reinforced structure for an existing gravity retaining wall as claimed in claim 1 or 2, wherein: the drilling depth of the drilling hole (2) is at least 5m below the retaining wall foundation (5); the steel pipe (3) is simultaneously inserted into the drill hole (2) during construction of the drill hole (2) by adopting a pipe following drilling mode, and the insertion depth of the steel pipe (3) is at least 0.5m below the retaining wall foundation (5).

5. A reinforced structure for an existing gravity retaining wall as claimed in claim 3, wherein: the anchoring section (4-1) of the prestressed anchor rod or the anchor cable (4) comprises a grouting part arranged below the steel pipe (3) and a grouting part arranged in the area range of the steel pipe (3) provided with the grouting hole (3-1).