CN206844131U - Light-duty combination retaining structure - Google Patents

Abstract

The utility model discloses a light-duty combined support and retaining structure, which comprises a box body composed of a box body bottom plate, a box body side wall and a box body top plate. Box fillers are filled in the box body, and transverse partitions are arranged at regular intervals in the box body. The front and rear side walls, the bottom plate and the top plate are connected to form a whole. Vertical prestressed anchor rods are installed in the side walls of the box body, and the prestressed anchor rods are anchored into the natural foundation; wall panels are vertically set on the top plate and side walls of the box body; On the top plate of the box body and the side wall of the box body, the support arms are arranged obliquely; the anchor wall is set at the position opposite to the wall panel; the tie rod is set between the wall panel and the anchor wall; Secure with anchors. It is suitable for large-scale high fill slope projects with high natural foundation bearing capacity. When the fill height is below 16m, compared with the traditional retaining structure, the comprehensive cost will be reduced by 20%-40%; for super high fill with a height of more than 16m The construction cost of the square side slope support will be significantly reduced, and there will be no technical problems at the same time.

Description

Light composite retaining structure

technical field

The utility model belongs to the technical field of civil engineering and relates to a light-duty combined support structure.

Background technique

At present, the types of retaining structures commonly used for filling slopes include: 1) Gravity and semi-gravity retaining walls (including counterweight retaining walls). This retaining structure was an important means of controlling large and medium-sized slopes in the 1950s, but the height of the retaining and filling slope of this retaining structure is extremely limited, and the commonly used height is less than 10 meters, and the section is large and the structure is heavy. At the same time, if the wall material is built with flakes or block stones with cement mortar, its durability will be poor. 2) Suspension (support) arm type retaining wall. The cantilever retaining wall is composed of a vertical arm, a wall toe plate, and a wall heel plate. When the wall is high, the bending moment at the lower part of the vertical arm is relatively large. If the wall panels and wall heel panels are connected with reinforced concrete buttresses every certain distance, a buttress type retaining wall is formed. This structure has the characteristics of light and handy structure and saving masonry. However, the retaining height is also very limited, and the common height is less than 10 meters. 3) The anchorage slab retaining wall should be used as the shoulder wall or embankment type retaining wall in areas with insufficient stone materials, and the wall height should not exceed 10.0m. Reinforced earth retaining wall is used for road shoulder wall or embankment retaining wall in general areas, and the wall height is not more than 12.0m. The disadvantage of the above retaining structure types is that the height of the retaining fill is limited. If the wall body is too high, the construction cost will increase significantly, and there are still many technical problems to be further studied and solved. Although the high-light prestressed anchor cable pile-slab wall proposed by the predecessors can be used for embankment retaining with steep fill heights of 12.0m-16.0m in natural terrain, the support structure wall must have a structure suitable for anchoring with prestressed anchor cables. stratum, and can provide sufficient anchoring force, so it is not suitable for a wide range of high fill slopes.

With the rapid development of highway and railway construction, in order to adapt to ever-changing site conditions and large-scale ultra-high fill (fill height over 16.0m, total slope height over 24.0m) slope retaining needs. It is in this domestic and foreign situation that the combined retaining structure has once again become a hot issue that engineers and technicians pay attention to.

Utility model content

In order to achieve the above purpose, the utility model provides a light combined retaining structure, when the filling height is below 16.0m, compared with the traditional retaining structure, the project cost can be reduced by 20%-30%; for the height exceeding 16.0m The project cost will be significantly reduced for ultra-high fill slope support, and there is no technical problem at the same time.

The technical solution adopted by the utility model is that the light-duty combined support structure includes a box body composed of a box body bottom plate, a box body side wall, and a box body top plate. A transverse partition is arranged between the front and rear side walls, the bottom plate and the top plate to form a whole, the steel pipe is vertically arranged in the side wall of the box body, the prestressed anchor rod is vertically arranged in the steel pipe, the prestressed anchor rod is anchored into the natural foundation, and the prestressed anchor rod The stress anchor rod body is inserted into the drill hole; the wall panel is vertically arranged on the top plate of the box body and the side wall of the box body; the buttress is installed obliquely on the top plate and the side wall of the box body; A pull rod is set between the panel and the anchor wall; the top of the prestressed anchor rod and the end of the pull rod are fixed with anchors.

Further, the transverse partitions are arranged every 3-5m, and the support arms are arranged every 3-5m, and the positions of the support arms correspond to the installation positions of the transverse partitions.

Further, the prestressed anchor rod is machined into a hole with a diameter of 110-200mm, and the strength of cement slurry poured into the hole is not lower than M30; the anchor rod body is made of deformed steel bar or steel strand.

Further, the thickness of the bottom plate of the box is 300-1000mm, the thickness of the side wall of the box and the diaphragm are both 200-500mm, the thickness of the top plate of the box is 300-600mm, and the concrete strength grade is not lower than C25.

Further, drain holes are reserved on the side wall of the box body, the distance between the drain holes is 2-3m, and the hole diameter is 50-100mm.

Further, the thickness of the wall panel and the anchor wall is 200-500 mm, the thickness of the arm is 300-500 mm, and the concrete strength grade of the wall panel, arm and anchor wall is not lower than C25.

Further, the tie rod adopts deformed steel bars or steel strands.

Further, when the tie rod is made of steel strands, it is made of unbonded steel strands. Except for the vicinity of the clips at both ends, the rest of the steel strands are first painted with anti-corrosion paint twice, and then coated with anti-corrosion grease. The inner diameter of the outer jacket is 17mm, hard plastic pipe with a wall thickness not less than 1mm.

The beneficial effect of the utility model is that the technical characteristics of the cantilever (support) arm type retaining wall, the gravity type retaining wall, the high and light prestressed anchor cable pile sheet wall, and the high and light anchorage plate retaining wall are integrated. Compared with the traditional high-fill, high-slope, and high-light retaining structure, this support structure is well reflected in terms of saving masonry, effectiveness of deformation control, and flexibility of structural combination. It mainly has the following characteristics:

1. Save masonry. It fully relies on the filler in the reinforced concrete box to replace the self-weight of the masonry to stabilize the soil and form a strong and stable support structure. At the same time, when the wall body is high and the stability of the retaining structure is insufficient, in order to save masonry, the stability of the retaining structure can be improved by setting vertical prestressed anchor rods and horizontal tie rods.

2. Effectiveness of deformation control. When the cantilever height of the wall panel on the reinforced concrete box is high, in order to enhance the overall rigidity of the wall panel and reduce the internal force of the wall panel, the wall panel and the wall heel panel are connected with reinforced concrete arms at a certain distance to improve the wall panel. Ability to resist deformation. When the retaining height is super high, the deformation of the retaining structure can be adjusted and controlled by setting one or more rows of horizontal tie rods, so as to enhance the stability of the retaining structure. It is also possible to further adjust and reduce the deformation of the retaining structure by applying prestress to the horizontal tie rods.

3. The flexibility of structural combination. The filler in the reinforced concrete box can be backfilled with materials such as soil or gravel according to the actual situation. At the same time, according to the height and stability of the support structure, the stability of the support structure can be adjusted by canceling or adding horizontal tie rods and vertical prestressed anchor rods. In order to improve the overall rigidity of the reinforced concrete box and enhance the ability of the retaining structure to resist deformation, the bottom plate, roof and side walls of the box can be connected with reinforced concrete diaphragms at intervals in the box.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural diagram of a light combined retaining structure in an embodiment of the utility model.

Fig. 2 is another structure diagram of the light-duty combined support structure in the embodiment of the utility model.

Fig. 3 is a plane sectional view of the box gravity type in the embodiment of the utility model.

In the figure, 1. Prestressed anchor rod, 2. Anchor rod body, 3. Box bottom plate, 4. Box side wall, 5. Steel pipe, 6. Box filler, 7. Box top plate, 8. Cement slurry, 9. Anchors, 10. Anchor concrete, 11. Wall panels, 12. Arms, 13. Anchorage walls, 14. Tie rods, 15. Diaphragms.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The light-duty combined support structure is shown in Figures 1 and 3, including a box body composed of a box bottom plate 3, a box side wall 4, and a box top plate 7. The box is filled with box filler 6, and the opposite box side wall 4 is provided with a transverse partition 15, a steel pipe 5 is vertically arranged in the side wall 4 of the box body, a prestressed anchor rod 1 is vertically arranged in the steel pipe 5, and the prestressed anchor rod body 2 is inserted into the borehole; the box body top plate 7, Wall panels 11 are vertically arranged on the box side walls 4; support arms 12 are arranged obliquely on the box top plate 7 and the box side walls 4; anchoring walls 13 are set relative to the wall panels 11; Pull rods 14 are set between 13; the top of the prestressed anchor rod 1 and the ends of the pull rods 14 are all fixed with anchors 9.

The structure of another embodiment is shown in FIG. 2 . The difference between FIG. 2 and FIG. 1 is that the arm 12 is removed.

The engineering method of treating large-scale high fill slopes with the light combined retaining structure in Fig. 2 is specifically carried out in accordance with the following steps:

Step 1, vertically setting the prestressed anchor rod 1: insert the prestressed anchor rod 1 rod body 2 into the drilled hole, and then pour cement slurry into the hole;

Step 2, construction of the bottom plate of the box body 3: the bottom plate of the box body 3 is made of reinforced concrete and cast on site;

Step 3, the construction of the box side wall 4 and the transverse partition 15 and the pre-embedding of the steel pipe 5 on the box side wall 4: a transverse partition 15 is arranged between the opposite box side walls 4, and the box side wall 4 and The diaphragm 15 is made of reinforced concrete and cast on site; before the concrete pouring of the side wall 4 of the box body, the steel pipe 5 should be vertically pre-embedded on the side wall 4 of the box body according to the design position, and the inner diameter of the steel pipe 5 is according to the diameter of the rod body 2 Determine the diameter;

Step 4, construction of the box filler 6: the box filler 6 is backfilled with soil or gravel materials, and the box filler 6 should be filled and compacted in layers, with a layer thickness of 30-50cm, 5 away from the side wall of the box and the diaphragm 15 The fill soil within 1m distance shall be compacted with a small road roller or tamping machine less than 1 ton, and the degree of compaction shall not be less than 85%;

Step 5, construction of the box top plate 7: the box top plate 7 is made of reinforced concrete and cast on site;

Step 6, stretching the prestressed anchor rod 1 and locking the top of the prestressed anchor rod 1 with the anchor 9, the tension load of the anchor rod 1 is determined according to the design requirements; pouring into the hole of the steel pipe 5 on the side wall 4 of the box body Cement slurry 8, then carry out the construction of sealing anchor concrete 10 on the anchorage 9;

Step 7, construction of wall panel 11 and anchor wall 13 and pre-embedding of steel pipe 5 on wall panel 11 and anchor wall 13: wall panel 11 and anchor wall 13 are made of reinforced concrete and cast on site; 1. Before the anchor wall 13 concrete is poured, the steel pipe 5 should be pre-embedded horizontally on the wall panel 11 and the anchor wall 13 according to the design position, and the inner diameter of the steel pipe 5 is determined according to the diameter of the pull rod 14;

Step 8, backfill construction of wall panel 11: the backfill soil of wall panel 11 should be layered and compacted, layered thickness 30-50cm, and the filling soil within the distance 1m range from wall panel 11 and anchor wall 13 should be less than 1 compaction with a small road roller or tamping machine of 1 ton, and the degree of compaction shall not be less than 85%; the filling of the soil behind the wall panel 11 shall be carried out with the installation, tensioning and locking of the tie rod 14 according to the setting position of the tie rod 14;

Step 9, positioning, installation, tensioning, locking, sealing and anchoring of the tie rod 14 and the construction of filling the cement slurry 8 in the hole: the positioning, installation and tensioning of the tie rod 14 are handed over to the filling of the soil behind the wall panel 11, Up to the design elevation of the top of the slope; before installing the tie rod 14, first fill to 0.2m above the design level of the tie rod 14, and start to install the tie rod 14 after the fill compaction reaches the specified requirements; when installing the tie rod 14, the design plane of the tie rod 14 should be The position is first excavated on the surface of the compacted fill, the groove width is 0.3m, and the depth is 10cm lower than the design level of the tie rod 14; In the excavated pull rod groove; the end of the pull rod 14 positioned at the anchor wall 13 is installed with the anchor 9, and the cement slurry 8 is poured into the steel pipe 5 pre-buried on the anchor wall 13, and then positioned on the anchor wall 13. For the construction of the anchoring concrete 10 on the anchorage wall 13, the grooves of the pull rod 14 are filled and compacted with notoginseng ash. The end of the tie rod 14 on the wall panel 11 is installed, and the tension of the tie rod 14, the tension classification, the tension load, and the tension time are determined according to the design requirements. When tensioning, attention should be paid to the deformation of the wall panel 11 and the deformation of the soil behind the wall panel 11. If any abnormal situation is found, the tension should be stopped, the cause should be found out, and measures should be taken;

Step 10, repeat the above step 9 until the filling reaches the top of the slope. After the filling is completed, all the tie rods 14 are stretched according to the design requirements, and the cement slurry 8 is poured into the steel pipe 5 pre-buried on the wall panel 11 At the same time, the construction of the anchor concrete 10 on the anchorage 9 on the wall panel 11 is carried out.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. All modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model are included in the protection scope of the present utility model.

Claims (8)

1. The light-duty combined support and retaining structure is characterized in that it includes a box composed of a box bottom plate (3), a box side wall (4), and a box roof (7), and the box is filled with box packing (6) , a transverse partition (15) is arranged between the opposite box side walls (4) to connect the front and rear side walls, the bottom plate (3) and the top plate (7), and a steel pipe ( 5), the prestressed anchor rod (1) is vertically arranged in the steel pipe (5), the prestressed anchor rod (1) is anchored into the natural foundation, and the prestressed anchor rod body (2) is inserted into the borehole; the box top plate (7 ), vertically set wall panel (11) on box body side wall (4); on box body top plate (7), box body side wall (4), obliquely set arm (12); opposite to wall panel (11) Anchor wall (13) is set at the position; pull rod (14) is set between wall panel (11) and anchor wall (13); the top of prestressed anchor rod (1) and the end of pull rod (14) all use anchorage (9) FIXED. 2. The light-duty combined support structure according to claim 1, characterized in that, the transverse partitions (15) are arranged every 3-5m, and the supporting arms (12) are arranged every 3-5m, and the supporting arms (12) are arranged every 3-5m, and The arm (12) corresponds to the installation position of the diaphragm (15). 3. The light composite retaining structure according to claim 1, characterized in that, the prestressed anchor rod (1) adopts mechanical hole forming, the hole diameter is 110-200mm, and the strength of cement slurry poured in the hole is not lower than M30 ; The anchor rod body (2) adopts deformed steel bars or steel strands. 4. The light-duty combined retaining structure according to claim 1, characterized in that, the thickness of the box bottom plate (3) is 300-1000mm, and the thickness of the box side wall (4) and the transverse partition (15) Both are 200-500mm, the thickness of the box top plate (7) is 300-600mm, and the concrete strength grade is not lower than C25. 5. The light combined support structure according to claim 1, characterized in that drain holes are reserved on the side wall (4) of the box body, the distance between the drain holes is 2-3m, and the aperture is 50-100mm. 6. The light combined retaining structure according to claim 1, characterized in that, the thickness of the wall panel (11) and the anchor wall (13) is 200-500mm, the thickness of the arm (12) is 300-500mm, and the wall The concrete strength grade of the panel (11), the support arm (12) and the anchor wall (13) is not lower than C25. 7. The light composite support structure according to claim 1, characterized in that, the tie rod (14) adopts deformed steel bars or steel strands. 8. The light-duty combined retaining structure according to claim 7, characterized in that, when the pull rod (14) adopts steel strands, it is made of unbonded steel strands, and the steel strands are made of steel strands except near the clips at both ends. The remaining parts are first painted with anti-corrosion paint twice, and then coated with anti-corrosion grease, and the hard plastic tube with an inner diameter of 17mm and a wall thickness of not less than 1mm is covered.