Anchoring body pouring mold for indoor pull-out test of sandy gravel stratum anchor rod

Abstract

A sand gravel stratum anchor rod indoor pull-out test anchoring body pouring mold comprises a transverse mold pipe, a first steel plate and a second steel plate, the mold pipe is hollow and is provided with two transverse ports, and the first steel plate and the second steel plate are pressed on the two transverse ports after being connected through a clamping mechanism; a closed forming cavity is defined by the mold pipe, the first steel plate and the second steel plate, a pouring funnel communicated with the forming cavity is arranged on the upper side of the mold pipe, an anchor rod penetrating hole communicated with the forming cavity is formed in the middle of the first steel plate, and one end of an anchor rod transversely penetrates through the anchor rod penetrating hole to enter the forming cavity. And an anchor rod inclination angle adjusting mechanism is arranged on the lower side of the die pipe. According to the anchoring body pouring mold, in an anchoring body formed by the mold, sandy cobbles are distributed on one side of an anchor rod in the length direction of the anchoring body, and meanwhile the distribution angle can be adjusted, so that the anchoring body form formed by site construction is more truly restored, and then the anchoring performance and the force transmission mechanism of a self-drilling type anchor rod in a sandy cobble stratum are accurately researched.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor body casting moulds, in particular to an anchor body casting mould for an indoor pull-out test of an anchor rod in a sand and gravel stratum. Background Art

[0002] Self-drilling anchor is a new type of anchor that integrates drilling, grouting and anchoring functions. It can effectively solve the problems of traditional steel anchors in broken and loose soil layers, such as easy hole collapse and low construction efficiency. It has broad application prospects in gravel formations. In order to study the anchoring performance of anchors, indoor pull-out tests are often used. The anchor body of the anchor is made by pouring cement slurry into a casting mold.

[0003] In the master's thesis "Research on the Anchoring Mechanism of Full-Length Bonded Anchor Bolts", a device for making anchor bolts was published. The device uses vertical casting, by blocking one end of a hollow steel barrel, and then vertically pouring cement mortar into the steel cylinder from the other end, and then inserting the steel bar, and ensuring that the steel bar is in the center of the cylinder and vertical, and then fixing the steel bar and placing it in a cool place for curing. However, this device is only suitable for the situation where the anchoring agent is evenly distributed around the anchor bolt.

[0004] Due to the construction process of drilling and grouting of self-drilling anchors, part of the original mud, sand and pebbles form anchor bodies together with cement slurry, and are unevenly distributed around the anchors. The actual results show that when using traditional vertical casting molds, the pebble particles that constitute the anchor body are deposited downward at the bottom of the mold due to their own weight. This is inconsistent with the fact that the sand and pebble particles are mostly distributed on the lower side of the anchor body along the depth direction of the anchor body in actual conditions, which will affect the research on the anchoring performance of self-drilling anchors in sand and pebble formations.

[0005] Therefore, we propose an anchor casting mold for indoor pull-out test of anchor rods in sand and gravel strata. Utility Model Content

[0006] The purpose of the utility model is to provide an anchor body casting mold for indoor pull-out test of anchor rods in sand and gravel strata. In the anchor body formed by the mold, sand and pebbles are distributed on one side of the anchor rod along the depth direction of the anchor body (anchor rod axial direction), and the distribution angle is adjustable to truly restore the anchor body shape formed by on-site construction, and then accurately study the anchoring performance and force transmission mechanism of the self-drilling anchor rod in sand and gravel strata in the indoor pull-out test.

[0007] The technical solution adopted by the utility model is: a casting mold for an anchor body for indoor pull-out test of an anchor rod in a sand and gravel formation comprises a horizontal mold tube and a first steel plate and a second steel plate, wherein the mold tube is hollow and has two transverse ports, and the first steel plate and the second steel plate are connected by a clamping mechanism and pressed on the two transverse ports;

[0008] The mold tube, the first steel plate and the second steel plate form a closed molding cavity. A casting funnel connected to the molding cavity is arranged on the upper side of the mold tube. An anchor rod penetration hole connected to the molding cavity is arranged in the middle of the first steel plate, so that one end of the anchor rod passes through the anchor rod penetration hole transversely and enters the molding cavity.

[0009] An anchor rod inclination adjustment mechanism is arranged on the lower side of the mold tube.

[0010] As a preferred solution, the mold tube is a PVC tube with a circular cross-section.

[0011] As a preferred solution, double-sided tapes are respectively provided on the contact surfaces of the transverse ports of the mold tube, and the double-sided tapes on both sides are respectively bonded to the first steel plate and the second steel plate.

[0012] As a preferred solution, corresponding transverse steel bar insertion holes are provided at the edge positions of the first steel plate and the second steel plate; the clamping mechanism includes no less than two transversely arranged threaded steel bars, each threaded steel bar transversely passes through the corresponding steel bar insertion holes on the first steel plate and the second steel plate, and the threaded steel bars are threaded with two sets of nuts I, and the two sets of nuts I are respectively pressed on the opposite sides of the first steel plate and the second steel plate.

[0013] As a preferred solution, it also includes a third steel plate detachably connected to the clamping mechanism, the third steel plate is juxtaposed with the first steel plate, and a guide hole for the anchor rod to pass through is provided in the middle of the third steel plate.

[0014] As a preferred solution, a thread I is provided on the inner wall of the hole through which the anchor rod penetrates, and the thread I is adapted to the thread on the surface of the anchor rod.

[0015] As a preferred solution, the anchor rod inclination adjustment mechanism includes a base supported on the ground, a tray supported on the lower side of the mold tube, and a telescopic rod; one end of the telescopic rod is fixedly connected to the base, and the other end is hinged to the tray.

[0016] As a preferred embodiment, the telescopic rod includes an outer sleeve, an inner tube and an extrusion sleeve; the top end of the outer sleeve is a deformation part, a shrinkage seam is arranged on the deformation part along the axial direction of the outer sleeve, and a thread II is arranged on the outer side of the circumferential surface of the outer sleeve; one end of the inner tube is hinged to the tray, and the other end extends to the inner cavity of the outer sleeve; the extrusion sleeve is sleeved on the outside of the outer sleeve and the inner tube, the extrusion sleeve has a conical surface part, the conical surface part is extruded on the outside of the deformation part, and the extrusion sleeve is provided with a thread III matching the thread II.

[0017] As a preferred solution, the cross section of the tray is arc-shaped.

[0018] As a preferred solution, there are two anchor rod inclination adjustment mechanisms, which are arranged in parallel below the mold tube.

[0019] The beneficial effects of the utility model are:

[0020] Based on the defects of the prior art, a casting mold for an anchor body for indoor pull-out test of an anchor rod in a sandy gravel formation is provided. Compared with the existing casting mold and casting method:

[0021] 1. The casting mold for the anchor body suitable for indoor pull-out test of self-drilling anchor rods in sand and gravel formations adopts a horizontal solution. After anchoring and forming, most of the sand and pebbles are distributed on the lower side of the anchor rod along the depth direction of the anchor body, which solves the problem of pebble particles depositing on the bottom of the anchor during casting in the existing mold. The manufactured anchor body is more in line with the actual situation of drilling and grouting of self-drilling anchor rods in pebble formations.

[0022] 2. The inclination of the anchor rod can be adjusted through the anchor rod inclination adjustment mechanism. On the basis that most of the sand and gravel are distributed on one side of the anchor rod along the depth direction of the anchor body (anchor rod axial direction), the distribution state of the sand and gravel relative to the anchor rod is adjusted to more realistically restore the drilling conditions of anchor rods at different sites.

[0023] 3. Double-sided tape is glued on both ends of the mold tube. The mold tube is pressed tightly by threaded steel bars and nuts in combination with the steel plates at both ends to make the mold assembly more secure.

[0024] 4. The anchor rod penetration hole of the first steel plate has the same type of thread as the anchor rod, which makes the anchor rod and the steel plate closer to prevent leakage during pouring, and also ensures that the anchor rod is always in the center of the anchor body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the overall axial side of the utility model;

[0027] Figure 2 It is a cross-sectional schematic diagram of the utility model in a horizontal state;

[0028] Figure 3 It is a cross-sectional schematic diagram of the utility model in an inclined state;

[0029] Figure 4 This is a schematic diagram of the anchor rod inclination adjustment mechanism after assembly of the utility model;

[0030] Figure 5 It is a schematic diagram of the decomposed state of the anchor rod inclination angle adjustment mechanism of the utility model;

[0031] Figure 6It is a plan view of the first steel plate of the utility model.

[0032] Figure numerals: 1. mold tube, 2. first steel plate, 3. second steel plate, 4. shrinkage joint, 5. casting funnel, 6. anchor rod insertion hole, 7. anchor rod, 8. double-sided tape, 9. steel bar insertion hole, 10. threaded steel bar, 11. nut I, 12. third steel plate, 13. guide hole, 14. base, 15. tray, 16. outer sleeve, 17. inner tube, 18. extrusion sleeve, 19. cone surface part, 20. thread II, 21. thread I. DETAILED DESCRIPTION

[0033] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0034] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this article should be understood by people with ordinary skills in the field to which the utility model belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of this utility model do not express quantitative restrictions, but indicate the existence of at least one; the "first", "second" and "third" used in this article should not be regarded as restrictions on the order of components, but are only used to distinguish different components; "include" or "comprise" and other similar words indicate that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, but do not exclude other elements or objects with the same function.

[0035] In order to more clearly describe the specific structure and use of the anchor casting mold, Figure 1-6 Describe this embodiment:

[0036] See also Figure 1 A casting mold for an indoor pull-out test anchor body of an anchor rod in a sand and gravel formation comprises a horizontal mold tube 1 and a first steel plate 2 and a second steel plate 3. The mold tube 1 is hollow and has two transverse ports. The first steel plate 2 and the second steel plate 3 are connected by a clamping mechanism and pressed on the two transverse ports. The mold tube 1, the first steel plate 2 and the second steel plate 3 form a closed molding cavity. The whole structure is a modular structure, which is easy to assemble and disassemble and can be reused to reduce costs.

[0037] The mold pipe 1 is a PVC pipe with a circular cross section. The PVC pipe can be cut into various lengths to meet the test requirements for different anchoring depths while having low cost.

[0038] See also Figure 6Since the mold is assembled, double-sided adhesive tape 8 can be provided on the contact surfaces of the two lateral ports of the mold tube 1, which can be foam double-sided adhesive tape, and the double-sided adhesive tape 8 on both sides is respectively bonded to the first steel plate 2 and the second steel plate 3. During the installation process, the double-sided adhesive tape has the functions of bonding and fixing, thereby preventing the mold tube 1 from slipping off, and also can increase the sealing of the molding cavity.

[0039] Brush oil on the first steel plate 2 and the second steel plate 3 in the PVC tube. This area is on the inner side of the double-sided tape to facilitate demoulding.

[0040] See also Figure 2 A casting funnel 5 connected to the forming cavity is arranged on the upper side of the mold tube 1, and an anchor rod insertion hole 6 connected to the forming cavity is arranged in the middle of the first steel plate 2, so that one end of the anchor rod 7 can be horizontally passed through the anchor rod insertion hole 6 to enter the forming cavity; cement slurry containing sand and pebbles is poured into the forming cavity through the casting funnel 5 at the top, and the cement slurry is cooled and formed to form an anchor body combined with the anchor rod 7, which can be taken out and then subjected to a pull-out test indoors; the mold adopts a horizontal design for sand and pebble formations, which solves the problem of pebble particles being deposited at the bottom of the anchor during casting in the existing mold, and the manufactured anchor body is more in line with the actual situation of the self-drilling anchor rod being drilled and grouted in the pebble formation. Figure 2 The cross-sectional diagram of the mold tube 1 and the anchor rod 7 in a horizontal state shows that although the sand and pebbles have settled, the upper side of the settled objects roughly has a horizontal interface, and along the axial direction of the anchor rod 7, there are sand and pebbles distributed in the part of the anchor rod 7 in the mold forming cavity. After the sand and pebbles and cement slurry with appropriate proportions are poured, most of the sand and pebbles after pouring can be distributed on the lower side of the anchor rod 7 along the anchoring depth direction (axial direction of the anchor rod 7), which is more in line with the actual situation.

[0041] The clamping mechanism is described in detail as follows: corresponding transverse steel bar insertion holes 9 are provided at the edge positions of the first steel plate 2 and the second steel plate 3; the clamping mechanism includes no less than two transversely arranged threaded steel bars 10, each threaded steel bar 10 transversely passes through the corresponding steel bar insertion holes 9 on the first steel plate 2 and the second steel plate 3, and the threaded steel bars 10 are threadedly matched with two groups of nuts Ⅰ11, and the two groups of nuts Ⅰ11 are respectively pressed on the opposite sides of the first steel plate 2 and the second steel plate 3. The clamping mechanism enables the first steel plate 2 and the second steel plate 3 to generate a clamping force for the extrusion mold tube 1, and is convenient for installation and disassembly.

[0042] The diameter of the steel bar insertion hole 9 is slightly larger than the outer diameter of the threaded steel bar 10 to facilitate the installation and disassembly of the mold.

[0043] In order to improve the stability of the anchor rod in the anchor rod insertion hole 6, a third steel plate 12 detachably connected to the clamping mechanism is also provided. The third steel plate 12 is juxtaposed with the first steel plate 2, and a guide hole 13 for the anchor rod 7 to pass through is provided in the middle of the third steel plate 12. The anchor rod 7 is supported by the guide hole 13 in cooperation with the anchor rod insertion hole 6, so as to further improve the stability, improve the tightness between the steel plate and the anchor rod, and also keep it in the center of the PVC pipe at all times. The first steel plate 2, the second steel plate 3, and the third steel plate 12 can be specifically square plates, with steel bar insertion holes designed at their four corners. In fixing the third steel plate 12, two nuts can be provided on each threaded steel bar 10, and the third steel plate 12 can be clamped by the two nuts to ensure the stability of the third steel plate 12.

[0044] Since the whole is a modular structure, a thread Ⅰ21 is provided on the inner wall of the anchor rod penetration hole 6, and the thread Ⅰ21 is adapted to the thread on the surface of the anchor rod 7. The anchor rod 7 is screwed into the hole to further reduce the gap between the anchor rod 7 and the anchor rod penetration hole to prevent leakage during pouring.

[0045] See also Figure 2 or Figure 3 In order to simulate the conditions of different sand and gravel formations, an anchor rod inclination adjustment mechanism is provided on the lower side of the mold tube 1 to adjust the inclination angles of the mold tube 1 and the anchor rod 7. There are two anchor rod inclination adjustment mechanisms, which are arranged in parallel below the mold tube 1. The mold tube 1 and the anchor rod 7 can be tilted by adjusting the heights of the two anchor rod inclination adjustment mechanisms. Figure 3 The diagram shows a tilted state, where the sand and gravel have settled, and the upper side of the settled material roughly has a horizontal interface, which forms an angle with the axial direction of the anchor rod 7. On the basis that most of the sand and gravel are distributed on the lower side of the anchor rod 7 along the depth direction of the anchor body (the axial direction of the anchor rod 7), the distribution state of the sand and gravel relative to the anchor rod is changed to more realistically restore the drilling conditions of the anchor rods at different sites.

[0046] The following is a detailed description of the anchor rod inclination adjustment mechanism: it includes a base 14 supported on the ground, a tray 15 supported on the lower side of the mold tube 1, and a telescopic rod; one end of the telescopic rod is fixedly connected to the base 14, and the other end is hinged to the tray 15. When the cross section of the mold tube 1 is circular, the cross section of the tray 15 is arc-shaped and fits the mold tube. The hinged manner allows the tray 15 to change with the inclination angle of the mold tube 1 and provide a stable supporting force. The telescopic rod has the functions of lifting and locking.

[0047] See also Figure 4 or Figure 5Specifically, the telescopic rod includes an outer sleeve 16, an inner tube 17 and an extrusion sleeve 18; the top end of the outer sleeve 16 is a deformation part, and a shrinkage seam 4 is arranged on the deformation part along the axial direction of the outer sleeve 16. The deformation part is a deformable part, and the shrinkage seam 4 is distributed in at least two parts, each part can be brought together under the action of extrusion, and expand outward when the extrusion is removed, and a thread II 20 is arranged on the outer side of the circumferential surface of the outer sleeve 16; one end of the inner tube 17 is hinged to the tray 15, and the other end extends to the inner cavity of the outer sleeve 16; the extrusion sleeve 18 is sleeved on the outer side of the outer sleeve 16 and the inner tube 17, and the extrusion sleeve 18 has a conical surface 19, which is extruded on the outer side of the deformation part, and the conical surface 19 is conical, and has a conical surface in contact with the upper end of the outer sleeve 16, and the extrusion sleeve 18 is provided with a thread III that matches the thread II 20.

[0048] The outer sleeve 16 and the inner tube 17 are sleeved together, so that the inner tube 17 can be extended and retracted in the outer sleeve 16, thereby changing the length of the entire telescopic rod; the function of the extrusion sleeve 18 is to use the conical surface 19 to squeeze the upper end of the outer sleeve 16 to make it shrink inward, so that the deformed part of the outer sleeve 16 squeezes the inner tube 17, thereby locking the height of the telescopic rod; the extrusion sleeve 18 and the outer sleeve 16 are connected by a threaded manner, which is convenient and stable and will not loosen.

[0049] During specific use, after the above-mentioned components are assembled and fixed, adjust the anchor rod inclination adjustment mechanism so that the mold tube 1 and the anchor rod 7 have a suitable inclination angle and simulation effect, and inject the casting material into the casting funnel 5; after the test piece has a certain strength, remove the threaded steel bar 10, the first steel plate 2, the second steel plate 3, the third steel plate 12 and the mold tube 1 in turn, and take out the anchor body.

[0050] The parts not described in detail in this embodiment are prior art.

[0051] It should be noted that although the utility model is described through the above embodiments, the utility model can also have other multiple embodiments. Without departing from the spirit and scope of the utility model, it is obvious that those skilled in the art can make various corresponding changes and deformations to the utility model, but these changes and deformations should all fall within the scope of protection of the attached claims of the utility model and their equivalents.

Claims

1. A casting mold for anchor body for indoor pull-out test of anchor rod in sand and gravel stratum, characterized in that: It comprises a horizontally placed mold tube (1) and a first steel plate (2) and a second steel plate (3); the mold tube (1) is hollow and has two transverse ports; the first steel plate (2) and the second steel plate (3) are connected by a clamping mechanism and then pressed onto the two transverse ports; The mold tube (1), the first steel plate (2), and the second steel plate (3) form a closed molding cavity. A casting funnel (5) connected to the molding cavity is provided on the upper side of the mold tube (1). An anchor rod insertion hole (6) connected to the molding cavity is provided in the middle of the first steel plate (2), so that one end of the anchor rod (7) can pass through the anchor rod insertion hole (6) transversely and enter the molding cavity. An anchor rod inclination adjustment mechanism is provided on the lower side of the mold tube (1).

2. The casting mold for an anchor body for indoor pull-out test of an anchor rod in sand and gravel stratum according to claim 1, characterized in that: The mold tube (1) is a PVC tube with a circular cross-section.

3. The casting mold for anchor body for indoor pull-out test of sand and gravel stratum anchor rod according to claim 1, characterized in that: Double-sided adhesive tapes (8) are respectively provided on the contact surfaces of the transverse ports of the mold tube (1), and the double-sided adhesive tapes (8) on both sides are respectively bonded to the first steel plate (2) and the second steel plate (3).

4. The casting mold for anchor body for indoor pull-out test of sand and gravel stratum anchor rod according to claim 1, characterized in that: The first steel plate (2) and the second steel plate (3) are provided with transversely corresponding steel bar insertion holes (9) at their edges; The clamping mechanism comprises at least two transversely arranged threaded steel bars (10), each of which passes transversely through corresponding steel bar insertion holes (9) on the first steel plate (2) and the second steel plate (3), and the threaded steel bars (10) are threadedly matched with two groups of nuts I (11), and the two groups of nuts I (11) are respectively pressed on the opposite sides of the first steel plate (2) and the second steel plate (3).

5. The casting mold for anchor body for indoor pull-out test of sand and gravel stratum anchor rod according to claim 1, characterized in that: It also comprises a third steel plate (12) detachably connected to the clamping mechanism, the third steel plate (12) being juxtaposed with the first steel plate (2), and a guide hole (13) for the anchor rod (7) to pass through being provided in the middle of the third steel plate (12).

6. The casting mold for anchor body for indoor pull-out test of sand and gravel stratum anchor rod according to claim 1, characterized in that: A thread I (21) is provided on the inner wall of the anchor rod penetration hole (6), and the thread I (21) is adapted to the thread on the surface of the anchor rod (7).

7. The casting mold for anchor body for indoor pull-out test of sand and gravel stratum anchor rod according to claim 1, characterized in that: The anchor rod inclination angle adjustment mechanism comprises a base (14) supported on the ground, a tray (15) supported on the lower side of the mold tube (1), and a telescopic rod; One end of the telescopic rod is fixedly connected to the base (14), and the other end is hinged to the tray (15).

8. The casting mold for anchor body for indoor pull-out test of sand and gravel stratum anchor rod according to claim 7, characterized in that: The telescopic rod comprises an outer sleeve (16), an inner tube (17) and an extrusion sleeve (18); The top end of the outer sleeve (16) is a deformation portion, a contraction seam (4) is provided on the deformation portion along the axial direction of the outer sleeve (16), and a thread II (20) is provided on the outer side of the circumferential surface of the outer sleeve (16); One end of the inner tube (17) is hinged to the tray (15), and the other end extends to the inner cavity of the outer tube (16); The extrusion sleeve (18) is sleeved on the outer sides of the outer sleeve (16) and the inner tube (17), the extrusion sleeve (18) has a conical surface (19), the conical surface (19) is squeezed on the outer side of the deformation portion, and the extrusion sleeve (18) is provided with a thread III that matches the thread II (20).

9. The casting mold for anchor body for indoor pull-out test of sand and gravel stratum anchor rod according to claim 7, characterized in that: The cross section of the tray (15) is arc-shaped.

10. The casting mold for anchor body for indoor pull-out test of sand and gravel stratum anchor rod according to claim 1, characterized in that: There are two anchor rod inclination adjustment mechanisms, which are arranged in parallel below the mold tube (1).

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