Back jacking grouting squeezing and expanding stiff expanded head anchor rod

Abstract

The utility model discloses a back jacking grouting squeezing and expanding stiff expanded head anchor rod which comprises N squeezing and expanding devices, squeezing and expanding device connecting pieces, a grouting pipe, an oil pressure pipe and an anchor rod body. Wherein each squeezing and expanding device is composed of an upper top plate, a lower bottom plate, a cross-shaped jack, a squeezing and expanding device framework and squeezing and expanding plates, the ends of the cross-shaped jacks are connected with the four squeezing and expanding plates respectively, the squeezing and expanding plate frameworks are connected with the upper top plates and the lower bottom plates, the oil pressure pipes are connected in series through jack connectors in the middles of the cross-shaped jacks respectively, and the mud jacking pipes penetrate through the squeezing and expanding devices respectively. And synchronous grouting treatment of each squeezing and expanding device is realized. According to the utility model, the uplift bearing capacity of the anchor rod is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor foundation application in civil engineering, in particular to a rear top grouting extrusion expansion strong enlarged head anchor rod. Background Art

[0002] As one of the main stress-bearing forms of underground engineering, rock slopes, and bridge anchors, anchor rods play an important role in maintaining the stability of civil engineering, especially in jointed and fissured rock masses, where the reinforcement effect of anchor rods on rock masses is very obvious. As a tensile member that penetrates deep into the stratum, the anchor rod is connected to the engineering structure at one end and penetrates deep into the stratum at the other end. The entire anchor rod is divided into a free section and an anchoring section. The free section refers to the area where the tension at the anchor rod head is transmitted to the anchor body, and its function is to apply prestress to the anchor rod. The anchoring section refers to the area where the cement slurry bonds the prestressed tendons to the soil layer. Its function is to increase the bonding friction between the anchor body and the soil layer, increase the bearing pressure of the anchor body, and transmit the tension of the free section to the depth of the soil. At present, the anchor section of the anchor foundation has a small cross-sectional area and limited anchoring force, and the bearing capacity of the anchor rod is insufficient. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a rear top grouting and extrusion expansion anchor rod with a strong enlarged head, which can strengthen the soil at the anchoring end by rear top grouting and increase the contact area between the anchoring section and the soil, thereby greatly improving the pull-out bearing capacity of the anchor rod.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A rear top grouting and extrusion expansion rigid enlarged head anchor bolt, comprising:

[0006] N squeezers, squeezer connectors, grouting pipes, hydraulic pipes and anchor rods.

[0007] The extruder includes an upper top plate, a lower bottom plate, a cross jack, an extruder frame and four extruder plates of the same size. The cross jack is located at the inner center of the extruder. One end of the extruder frame is connected to the upper top plate by welding, and the other end of the extruder frame is connected to the lower bottom plate by welding. The extruders are connected to each other through extruder connectors; the hydraulic pipes are connected in series through the jack joints in the middle of the cross jacks to achieve synchronous jacking of the jacks; each grouting pipe passes through the extruder and is connected to the grouting chamber by bolts to achieve synchronous grouting treatment of each extruder; the anchor rod passes through the extruder.

[0008] Furthermore, the N expanders are placed vertically and in parallel.

[0009] Furthermore, the diameter of the squeezer is slightly smaller than the diameter of the anchor hole, ranging from 5 to 10 mm; the height of the squeezer is between 100 mm and 200 mm.

[0010] Furthermore, the periphery of the extruder is a cylindrical steel pipe, and four extrusion plates of the same size are symmetrically cut in the front, back, left and right directions of the cylindrical steel pipe, and the extrusion plates are distributed between the extruder skeletons with a gap of 2 to 5 mm.

[0011] Furthermore, the thickness of the upper top plate and the lower bottom plate are both between 5 mm and 10 mm.

[0012] Furthermore, the extruder connector includes connecting steel bars or cylindrical steel pipes.

[0013] When the extruders are connected with connecting steel bars, the lower bottom plate of the extruder located above is connected to the upper end of the connecting steel bars by welding, and the upper top plate of the extruder located below is connected to the lower end of the connecting steel bars by welding;

[0014] When the expanders are connected by cylindrical steel pipes, the lower bottom plate of the expander located above is connected to the upper end of the cylindrical steel pipe by welding, and the upper top plate of the expander located below is connected to the lower end of the cylindrical steel pipe by welding.

[0015] Furthermore, the distance between the expander and the extruder is 200mm-500mm.

[0016] Furthermore, a grouting chamber is provided inside the extruder, and N grouting holes are opened around the grouting chamber.

[0017] Furthermore, the cross jack includes four push rods, each of which is arranged vertically and horizontally in a cross manner, and the length of the push rod is 0.5 times the diameter of the extruder; the end of each push rod is respectively connected to the four extrusion plates by welding.

[0018] Furthermore, the ejector rod adopts a single-section ejector rod or a double-section ejector rod, and the ejection length is 1.0-2.0 times the length of the ejector rod itself.

[0019] Compared with the prior art, the utility model adopts the above technical solution and has the following technical effects:

[0020] The utility model proposes a rear top grouting extrusion expansion rigid enlarged head anchor rod, which adopts the form of rear top grouting. The size of the enlarged head increases with the increase of grouting amount. At the same time, grouting can improve the strength of the soil at the enlarged head. Its effect is much better than that of ordinary enlarged heads, and the bearing capacity is greatly improved. At the same time, this method adopts rear top grouting without the need for pre-expansion, which greatly saves construction period and construction cost. At the same time, after the extrusion expansion plate is pushed out, it can be regarded as the built-in steel bar of the enlarged head to form a rigid enlarged head, and the strength of the enlarged head itself is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 It is a partial schematic diagram of the extruder of the utility model.

[0023] Figure 3 It is a schematic diagram of the top opening of the extruded and expanded plate of the utility model.

[0024] Figure 4 It is a rendering of an embodiment of the utility model.

[0025] 1-expanding device; 2-upper top plate; 3-lower bottom plate; 4-connecting steel bars; 5-cylindrical steel pipe; 6-grouting pipe; 7-anchor rod; 8-hydraulic pipe; 9-grouting chamber; 10-grouting hole; 11-expanding device frame; 12-expanding plate; 13-jack joint; 14-cross jack; 15-enlargement head; 16-foundation; 17-anchor hole. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0027] To achieve the above purpose, the utility model proposes a rear top grouting extrusion expansion rigidity enlarged head anchor rod, such as Figure 1 , Figure 2 As shown, including:

[0028] N squeezers, squeezer connectors, grouting pipe 6, hydraulic pipe 8 and anchor rod 7.

[0029] The extruder 1 includes an upper top plate 2, a lower bottom plate 3, a cross jack 14, an extruder skeleton 11 and four extruder plates 12 of the same size. The cross jack 14 is located at the inner center of the extruder 1. One end of the extruder skeleton 11 is connected to the upper top plate 2 by welding, and the other end of the extruder skeleton 11 is connected to the lower bottom plate 3 by welding; the extruders are connected to each other through extruder connectors; the hydraulic pipe 8 is connected in series through the jack joint 13 in the middle of the cross jack 14 to achieve synchronous jacking of the jacks; each grouting pipe passes through the extruder and is connected to the grouting chamber by bolts to achieve synchronous grouting treatment of each extruder; the anchor rod 7 passes through the extruder.

[0030] The N expanders are placed vertically and in parallel.

[0031] The diameter of the squeezer 1 is slightly smaller than the anchor hole diameter, ranging from 5 to 10 mm; the height of the squeezer 1 is between 100 mm and 200 mm.

[0032] The periphery of the extruder is a cylindrical steel pipe, and four extrusion plates 12 of the same size are symmetrically cut in the front, back, left and right directions of the cylindrical steel pipe. The extrusion plates 12 are distributed between the extruder skeletons 11 and have a gap of 2 to 5 mm.

[0033] The thickness of the upper top plate 2 and the lower bottom plate 3 are both between 5 mm and 10 mm.

[0034] The extruder connector includes a connecting steel bar 4 or a cylindrical steel pipe 5;

[0035] When the extruders are connected with the connecting steel bar 4, the lower bottom plate of the extruder located above is connected to the upper end of the connecting steel bar 4 by welding, and the upper top plate of the extruder located below is connected to the lower end of the connecting steel bar 4 by welding;

[0036] When the expanders are connected with each other by cylindrical steel pipe 5, the lower bottom plate of the expander located above is connected to the upper end of the cylindrical steel pipe 5 by welding, and the upper top plate of the expander located below is connected to the lower end of the cylindrical steel pipe 5 by welding.

[0037] The distance between the squeezers is 200mm-500mm.

[0038] A grouting chamber 9 is provided inside the extruder, and N grouting holes 10 are provided around the grouting chamber 9.

[0039] like Figure 3 As shown, the cross jack 14 includes four push rods, each of which is arranged vertically and horizontally in a cross manner, and the length of the push rod is 0.5 times the diameter of the extruder; the end of each push rod is respectively connected to the four extrusion plates 12 by welding.

[0040] The ejector rod is a single-section ejector rod or a double-section ejector rod, and the ejection length is 1.0-2.0 times the length of the ejector rod itself.

[0041] like Figure 4 As shown, the construction operation is carried out using the rear top grouting and extrusion expansion rigid enlarged head anchor rod proposed in this application, and the specific process is as follows:

[0042] First, place the anchor rod with the squeezer into the anchor hole 17. After reaching the set depth, perform the first grouting in the anchor hole 17. When the slurry reaches the initial setting, pre-push the squeezer 1 and push the squeezer plate 12 into the soil 5mm-10mm. When the slurry reaches the designed strength, pressurize the hydraulic pipe 8 through the hydraulic pump, transfer the pressure to each cross jack 14, and push the four squeezer plates 12 to the limit displacement. Grouting is performed in each grouting chamber 9 through the grouting pipe 6. The slurry is grouted outward through the grouting hole 10 to form an enlarged head around the squeezer 1, forming a whole with the anchor rod 7, greatly improving the pull-out bearing capacity of the anchor rod.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A rear top grouting and extrusion expansion anchor bolt with a rigid enlarged head, characterized in that: include: N extruders, extruder connectors, grouting pipes (6), hydraulic pipes (8) and anchor rods (7); The extruder (1) comprises an upper top plate (2), a lower bottom plate (3), a cross jack (14), an extruder frame (11) and four extruder plates (12) of the same size. A grouting chamber (9) is arranged inside the extruder (1). The cross jack (14) is located at the inner center of the extruder (1). One end of the extruder frame (11) is connected to the upper top plate (2), and the other end of the extruder frame (11) is connected to the lower bottom plate (3). The extruders are connected to each other through an extruder connector. The hydraulic pipe (8) is connected in series through a jack joint (13) in the middle of the cross jack (14). Each grouting pipe passes through the extruder and is connected to the grouting chamber through bolts. The anchor rod (7) passes through the extruder. The extruder plates (12) are distributed between the extruder frames (11).

2. The rear top grouting and extrusion expansion rigid enlarged head anchor according to claim 1 is characterized in that: The N expanders are placed vertically and in parallel.

3. The rear top grouting and extrusion expansion rigid enlarged head anchor according to claim 1, characterized in that: The diameter of the squeezer (1) is smaller than the diameter of the anchor hole, ranging from 5 to 10 mm; the height of the squeezer (1) is between 100 mm and 200 mm.

4. The rear top grouting and extrusion expansion rigid enlarged head anchor according to claim 1, characterized in that: The periphery of the extruder is a cylindrical steel pipe, and four extrusion plates (12) of the same size are symmetrically cut out in the front, back, left and right directions of the cylindrical steel pipe, and a gap of 2 to 5 mm exists between the extrusion plates (12) and the extruder frame (11).

5. The rear top grouting and extrusion expansion rigid enlarged head anchor according to claim 1, characterized in that: The thickness of the upper top plate (2) and the lower bottom plate (3) are both between 5 mm and 10 mm.

6. The rear top grouting and extrusion expansion rigid enlarged head anchor according to claim 1, characterized in that: The extruder connector includes a connecting steel bar (4) or a cylindrical steel pipe (5); When the extruders are connected to each other by connecting steel bars (4), the lower bottom plate of the extruder located at the top is connected to the upper end of the connecting steel bars (4) by welding, and the upper top plate of the extruder located at the bottom is connected to the lower end of the connecting steel bars (4) by welding; When the expanders are connected with each other by a cylindrical steel pipe (5), the lower bottom plate of the expander located above is connected to the upper end of the cylindrical steel pipe (5) by welding, and the upper top plate of the expander located below is connected to the lower end of the cylindrical steel pipe (5) by welding.

7. The rear top grouting and extrusion expansion rigid enlarged head anchor according to claim 1, characterized in that: The distance between the squeezers is 200mm-500mm.

8. The rear top grouting and extrusion expansion rigid enlarged head anchor according to claim 1, characterized in that: The grouting chamber (9) is provided with N grouting holes (10).

9. The rear top grouting and extrusion expansion rigid enlarged head anchor according to claim 1, characterized in that: The cross jack (14) comprises four push rods, each of which is arranged crosswise, vertically and horizontally, and the length of the push rod is 0.5 times the diameter of the extruder; the end of each push rod is respectively connected to four extrusion plates (12) by welding.

10. The rear top grouting and extrusion expansion rigid enlarged head anchor according to claim 9, characterized in that: The ejector rod is a single-section ejector rod or a double-section ejector rod, and the ejection length is 1.0-2.0 times the length of the ejector rod itself.

Images