CN111576455A - Umbrella-shaped support structure and construction method for slope prevention and control - Google Patents

Abstract

The invention discloses an umbrella-shaped supporting structure for slope prevention and control and a construction method thereof, wherein the umbrella-shaped supporting structure comprises a plurality of supporting units arranged at intervals and a soil retaining plate arranged between the adjacent supporting units; the supporting unit comprises vertical piles, toe beams and heel beams which are respectively and vertically rigidly connected to the two side faces of the vertical piles, inclined supporting beams rigidly connected between the toe beams and the vertical piles and inclined pulling beams rigidly connected between the heel beams and the vertical piles, and soil retaining plates are arranged between adjacent vertical piles, and included angles are formed between the inclined supporting beams and the vertical piles and between the inclined pulling beams and the vertical piles. The supporting unit can resist larger lateral loads of soil bodies, and is strong in deformation resistance, good in supporting effect, small in structural internal force, safe and economical.

Description

Umbrella-shaped support structure and construction method for slope prevention and control

technical field

The invention relates to the technical field of side slope prevention and control, in particular to an umbrella-shaped support structure and a construction method for side slope prevention and control.

Background technique

Due to the needs of engineering construction, a fill environmental slope will be formed, and it is necessary to support and control the slope. In the prior art, the prevention and control are mainly carried out by means of cantilever piles, anchor piles, double-row piles, support structures, gravity type, counterweight type retaining walls, and cantilever type and arm guard retaining walls. However, the cantilever piles cannot resist the large lateral soil load, the anti-deformation ability is small, the height of the supporting slope is limited, and the vertical pile embedded section is long. The use of anchor piles requires reliable rock and soil anchors. At the same time, in order to avoid the unfavorable additional tension of the anchor cables caused by the self-weight settlement of the fill, the anchor cables need to be protected in advance, and the construction of the anchor cables will cause damage to the surrounding structures. The use of double-row piles takes up a lot of space, controls the settlement of the pile bottom of the front piles more strictly, the size of the connecting beams at the top of the piles is large, and the soil reaction force between the front and rear rows of piles is difficult to determine. The use of a bracing structure requires a separate and reliable diagonal bracing foundation. Gravity type and counterweight type retaining wall masonry is large in size, the amount of foundation excavation is large, and the foundation pit needs temporary support treatment; the cantilever type and arm guard type retaining wall is limited in height.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an umbrella-shaped support structure and a construction method for slope prevention and control, so as to solve the problem that the existing support structure cannot fully meet the requirements of slope support.

The technical solutions of the present invention to solve the above-mentioned technical problems are as follows: an umbrella-shaped support structure for slope prevention and control, comprising a plurality of support units arranged at intervals and earth retaining plates arranged between adjacent support units;

The support unit includes vertical piles, toe beams and heel beams rigidly connected on both sides of the vertical piles, diagonal brace beams rigidly connected between the toe beams and the vertical piles, and rigidly connected between the heel beams and the vertical piles. The inclined-stayed beams between the piles, the earth retaining plates are arranged between adjacent vertical piles, and there are included angles between the inclined-braced beams and the vertical piles and between the inclined-stayed beams and the vertical piles.

Further, the vertical pile includes an exposed section and an embedded section, the exposed section is located above the toe beam and the heel beam, the embedded section is located below the toe beam and the heel beam, and the retaining plate is arranged at the exit of the adjacent vertical piles. between the exposed sections;

The diagonal bracing beam is rigidly connected between the toe beam and the exposed section, and the diagonal-stayed beam is rigidly connected between the heel beam and the exposed section.

Further, the clamps between the vertical piles and the diagonal braced beams and the included angles between the vertical piles and the diagonally braced beams are both 30°-45°.

Further, the distance between adjacent vertical piles is 3 to 5 times the diameter of the vertical piles.

Further, the diagonal bracing beam and the diagonal-stayed beam are arranged in a single channel or multiple channels.

Further, the vertical piles, toe beams, heel beams, diagonal bracing beams, diagonal-stayed beams and earth retaining plates are all reinforced concrete structures.

The present invention also provides a construction method for the umbrella-shaped support structure for side slope prevention and control, comprising the following steps:

Step ①: Manually dig holes or mechanically drill holes on the pile ground, and apply vertical piles in the holes;

Step 2: Bind the toe beam steel bars and heel beam steel bars where the vertical piles are exposed to the ground;

Step ③: construct the exposed section of the vertical pile, and construct the exposed section to the connection with the diagonal bracing beam and the diagonal-stayed beam;

Step ④: make a diagonal brace beam, make the two ends of the diagonal brace beam rigidly connect with the toe beam and the vertical pile respectively, and pour the toe beam concrete at the same time;

Step ⑤: Make the inclined-stayed beams so that the two ends of the inclined-stayed beams are rigidly connected with the heel beams and the vertical piles respectively, and the heel beam concrete is poured at the same time;

Step ⑥: Continue to apply the exposed section of the vertical pile until the top of the pile;

Step ⑦: Make earth retaining plates between the exposed sections of adjacent vertical piles, and compress the backfill in layers behind the vertical piles to the top of the slope.

Further, in step 1, when the vertical pile is applied, the top of the vertical pile is made to stick out of the ground, wherein the part of the vertical pile that sticks out of the ground is the exposed section, and the part of the vertical pile that is located in the rock and soil layer is Embedded segment.

Further, in step ④, multiple diagonal bracing beams are applied.

Further, in step ⑤, multiple cable-stayed beams are applied.

The present invention has the following beneficial effects: a kind of umbrella-shaped support structure and construction method for slope prevention and control provided by the present invention:

(1) Toe beams are added near the ground near the bottom of the slope in front of the vertical piles and heel beams are added after the piles; the self-weight of the fill soil acting on the heel beams can resist the lateral load of part of the soil to the apex moment of the embedded section. The moment of the foundation reaction acting on the toe beam can also resist the moment generated by the lateral load of part of the soil; reducing the lateral load of the soil on the vertical pile can improve the deformation resistance of the structure , effectively supporting the slope.

(2) By setting the diagonal bracing beam in front of the pile, the bottom end of the toe beam is subjected to bending, tension and shearing to provide support, the top supports the vertical pile, and the diagonal bracing beam is compressed to reduce the outward overturning of the vertical pile; The inclined-stayed beam after the pile is installed, and its bottom end is anchored by bending, compression and shearing of the heel beam, and the vertical pile is pulled at the top, and the inclined-stayed beam is pulled, and at the same time, the outward overturning of the vertical pile is reduced; The force is more reasonable and the deformation resistance is stronger.

(3) Compared with the cantilever pile, the support structure of the present invention can reduce the pile top deformation by about 30%, and the maximum bending moment of the vertical pile is reduced by about 30% compared with the cantilever pile, thereby reducing the diameter of the pile and the depth of the embedded section. , cost saving, and the height of the supporting slope is higher; compared with the anchor cable pile, the cable-stayed beam does not need geotechnical anchors, and is directly connected to the heel beam, which is displayed when the anchor cable has no reliable anchoring section or the anchoring section is deeper. At the same time, it avoids the problem of unfavorable additional tension caused by the lateral extrusion of the anchor cable and the damage to the surrounding buildings caused by the construction of the anchor cable; compared with the double-row pile, it takes up less space and does not need a large-sized pile top. Coupling beam; compared with the supporting structure, the inclined-stayed beam and the heel beam are added, the force is more reasonable, the deformation resistance is stronger, and no other diagonal braced beam foundation is required; compared with the gravity type and counterweight type retaining wall, the structure Small in size, no need to excavate and deal with temporary foundation pits, and has stronger anti-slip and anti-overturning capabilities; compared with cantilever and arm-type retaining walls, the retaining height is higher.

Description of drawings

Fig. 1 is the structural representation of the present invention;

2 is a side view of a support unit in the present invention;

The reference numerals shown in Figures 1 to 2 are respectively indicated as: 1-support unit, 2-retaining plate, 10-vertical pile, 11-toe beam, 12-heel beam, 13-diagonal beam, 14 -Cable-stayed beam, 101- exposed section, 102- embedded section.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

As shown in FIGS. 1 to 2 , an umbrella-shaped support structure for slope prevention and control includes a plurality of support units 1 arranged at intervals and earth retaining plates 2 arranged between adjacent support units 1 . The support unit 1 can resist a larger lateral load of soil, has strong anti-deformation ability, small structural internal force, and is safe and economical.

The support unit 1 includes a vertical pile 10 , a toe beam 11 and a heel beam 12 rigidly connected on both sides of the vertical pile 10 respectively, and a diagonal bracing beam rigidly connected between the toe beam 11 and the vertical pile 10 . 13 and the diagonal-stayed beam 14 rigidly connected between the heel beam 12 and the vertical pile 10, the earth retaining plate 2 is arranged between the adjacent vertical piles 10, the diagonal bracing beam 13 and the vertical pile 10 and There is an included angle between the oblique-stayed beam 14 and the vertical pile 10 .

A toe beam 11 is added near the ground near the bottom of the slope in front of the vertical pile 10, and a heel beam 12 is added after the pile. The self-weight of the filling soil acting on the heel beam 12 can resist the lateral load of the embedded section 102. generated torque. The ground reaction force acting on the toe beam 11 to the apex moment of the embedded section 102 can also resist the moment generated by part of the lateral load of the soil. By setting the diagonal bracing beam 13 in front of the pile, the bottom end of the toe beam 11 is supported by bending, tension and shearing, and the top supports the vertical pile 10, and the diagonal bracing beam 13 is compressed to reduce the overturning of the vertical pile 10. . By arranging the inclined-stayed beam 14 behind the pile, its bottom end is anchored by bending, compression and shearing of the heel beam 12, the top end pulls the vertical pile 10, and the inclined-stayed beam 14 is tensioned, while reducing the vertical pile 10 outward. capsize.

The vertical pile 10 includes an exposed section 101 and an embedded section 102. The exposed section 101 and the embedded section 102 form an integral structure of the vertical pile 10. The exposed section 101 is located above the toe beam 11 and the heel beam 12. The solid section 102 is located below the toe beam 11 and the heel beam 12, and the soil retaining plate 2 is arranged between the exposed sections 101 of the adjacent vertical piles 10, and the soil retaining plate 2 plays a role of supporting and retaining soil. The diagonal brace beam 13 is rigidly connected between the toe beam 11 and the exposed section 101 , and the diagonal braced beam 14 is rigidly connected between the heel beam 12 and the exposed section 101 .

The clamp between the vertical pile 10 and the diagonal brace beam 13 and the included angle between the vertical pile 10 and the diagonal braced beam 14 are both 30°-45°. Both the diagonal bracing beam 13 and the diagonal-stayed beam 14 are inclined, and the respective force strengths within the range of the inclination angle can be effectively ensured by limiting the inclination angle.

In the present invention, the distance between adjacent vertical piles 10 is 3 to 5 times the diameter of the vertical piles 10 .

In order to meet the slope prevention and control under different working conditions, in the present invention, the diagonal bracing beams 13 and the diagonally-stayed beams 14 are set to be single or multiple. Through the setting of single or multi-channel diagonal brace beams 13 and diagonal-stayed beams 14, the bending, tensile and shear strengths are effectively improved, and the applicable reliability of the supporting structure is improved.

The vertical piles 10 , the toe beams 11 , the heel beams 12 , the diagonal brace beams 13 , the diagonal-stayed beams 14 and the earth retaining plate 2 are all reinforced concrete structures. It adopts reinforced concrete structure, which is convenient to obtain materials, convenient and reliable in construction, and has high structural strength.

The present invention also provides a construction method for the umbrella-shaped support structure for side slope prevention and control, comprising the following steps:

Step ①: Manually dig holes or mechanically drill holes on the pile ground, and apply vertical piles 10 in the holes. When the vertical pile 10 is applied, the top of the vertical pile 10 is protruded from the ground. The exposed section 101 of the vertical pile 10 protrudes from the ground, and the vertical pile 10 located in the rock and soil layer is embedded. segment 102.

Step 2: Bind the reinforcing bars of the toe beam 11 and the reinforcing bars of the heel beam 12 at the exposed ground of the vertical pile 10;

Step ③: The exposed section 101 of the vertical pile 10 is constructed, and the exposed section 101 is constructed to the connection with the diagonal bracing beam 13 and the diagonal-stayed beam 14 .

Step ④: apply the diagonal bracing beam 13, so that the two ends of the diagonal bracing beam 13 are rigidly connected with the toe beam 11 and the vertical pile 10 respectively, and the concrete of the toe beam 11 is poured at the same time; Road diagonal braces 13.

Step ⑤: apply the oblique-stayed beam 14, so that the two ends of the oblique-stayed beam 14 are rigidly connected with the heel beam 12 and the vertical pile 10 respectively, and the heel beam 12 concrete is poured at the same time; Road stay beam 14.

Step ⑥: Continue to apply the exposed section 101 of the vertical pile 10 to the top of the pile;

Step ⑦: Install the earth retaining plate 2 between the exposed sections 101 of the adjacent vertical piles 10, and after the vertical piles 10, the backfill is compacted in layers to the top of the slope.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. An umbrella-shaped supporting structure for slope prevention and control is characterized by comprising a plurality of supporting units (1) arranged at intervals and retaining plates (2) arranged between the adjacent supporting units (1);

support unit (1) including vertical stake (10), perpendicular rigid connection respectively toe roof beam (11) and heel roof beam (12), rigid connection on vertical stake (10) both sides face toe roof beam (11) with bracing roof beam (13) and rigid connection between vertical stake (10) heel roof beam (12) with oblique straining beam (14) between vertical stake (10), it is adjacent that fender soil board (2) set up between vertical stake (10), bracing roof beam (13) with between vertical stake (10) and oblique straining beam (14) with all have the contained angle between vertical stake (10).

2. The umbrella-type supporting structure for slope control according to claim 1, characterized in that the vertical piles (10) comprise an exposure section (101) and an embedment section (102), the exposure section (101) being located above the toe beam (11) and the heel beam (12), the embedment section (102) being located below the toe beam (11) and the heel beam (12), the soil guard plate (2) being disposed between the exposure sections (101) of adjacent vertical piles (10);

the raker beam (13) is rigidly connected between the toe beam (11) and the exposure section (101), and the raker beam (14) is rigidly connected between the heel beam (12) and the exposure section (101).

3. The umbrella-type supporting structure for slope control according to claim 1, characterized in that the included angles between the clamps between the vertical piles (10) and the raker beams (13) and between the vertical piles (10) and the raker beams (14) are each 30-45 °.

4. The umbrella-type supporting structure for slope control according to any one of claims 1 to 3, characterized in that the distance between adjacent vertical piles (10) is 3 to 5 times the pile diameter of the vertical piles (10).

5. The umbrella-type support structure for slope control according to claim 4, wherein the raker beams (13) and the diagonal tension beams (14) are provided in a single lane or multiple lanes.

6. The umbrella-type supporting structure for slope prevention according to claim 4, wherein the vertical piles (10), toe beams (11), heel beams (12), raker beams (13), diagonal draw beams (14) and retaining plates (2) are all of reinforced concrete structures.

7. The construction method of an umbrella-type supporting structure for slope prevention and control according to any one of claims 1 to 6, characterized by comprising the steps of:

the method comprises the following steps: manually digging or mechanically drilling a hole on the ground with the pile, and constructing a vertical pile (10) in the hole;

step two: binding toe beam (11) reinforcing steel bars and heel beam (12) reinforcing steel bars at the position of the vertical pile (10) exposed out of the ground;

step three: constructing an exposed section (101) of the vertical pile (10), and constructing the exposed section (101) to the connection part of the inclined supporting beam (13) and the inclined pulling beam (14);

step IV: constructing an inclined supporting beam (13), rigidly connecting two ends of the inclined supporting beam (13) with the toe beam (11) and the vertical pile (10) respectively, and pouring concrete of the toe beam (11);

step five: constructing an inclined draw beam (14), enabling two ends of the inclined draw beam (14) to be respectively and rigidly connected with the heel beam (12) and the vertical pile (10), and pouring concrete of the heel beam (12);

step (c): continuously constructing the exposed section (101) of the vertical pile (10) until the pile top;

step (c): constructing soil retaining plates (2) between exposed sections (101) of adjacent vertical piles (10), and compacting, backfilling and filling soil to the top of the side slope layer by layer after the vertical piles (10) are piled.

8. The construction method of the umbrella-shaped supporting structure for slope prevention and control according to claim 7, characterized in that in the step (r), when the vertical piles (10) are constructed, the top ends of the vertical piles (10) are made to extend out of the ground, wherein the vertical piles (10) extend out of the ground to form exposed sections (101), and the vertical piles (10) are arranged in rock-soil layers to form embedded sections (102).

9. The construction method of an umbrella-type supporting structure for slope prevention according to claim 7, characterized in that, in the step (r), a single or multiple raker beams (13) are applied.

10. The construction method of an umbrella-type supporting structure for slope prevention according to claim 7, characterized in that a single or multiple diagonal tension beams (14) are applied in the fifth step.

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