Self-drilling type hollow anchor rod supporting device

Abstract

The utility model belongs to the technical field of foundation construction, and particularly relates to a self-drilling type hollow anchor rod supporting device. The self-drilling type hollow anchor rod supporting device can meet the anchoring requirements of different rock-soil bodies such as gravelly soil, viscous sand soil layers and sludge layers, is high in construction speed and low in construction cost, and has a good market application prospect, and the construction site is clean, environment-friendly and pollution-free. The utility model provides a self-drilling type hollow anchor rod supporting device. The self-drilling type hollow anchor rod supporting device comprises a self-drilling type anchoring head, an anchoring head connecting sleeve, a first hollow drill rod, a steel strand, a second hollow extension rod, a drill rod connecting sleeve and other structural units.

Description

Technical Field

[0001] The utility model belongs to the technical field of foundation construction, and particularly relates to a self-drilling hollow anchor support device. Background Art

[0002] With the continuous deepening of the urbanization process, the scale of China's construction industry has continued to expand, and the corresponding building structures have become more complex. To meet the structural requirements of construction projects, the construction of building foundation pit support projects must be carried out first in the initial stage of construction projects. It should be noted that foundation pit support, as the foundation of building construction projects, its engineering quality is the guarantee of building construction. That is to say, only when the foundation pit support construction meets the quality requirements can the stability and reliability of the subsequent building construction be ensured.

[0003] Among them, as a relatively common foundation pit support method, anchor support adds anchors to the rock and soil mass, and uses the anchoring effect of the anchors to reinforce the rock and soil mass and effectively control its deformation, so that the foundation pit support structure has better load-bearing capacity and load-bearing performance, creating good conditions for the smooth progress of subsequent construction.

[0004] However, after further research, the inventor found that although the existing reinforced anchor structure has many technical advantages such as fast and convenient construction and less disturbance to the rock and soil mass, it also has many technical limitations. For example: the existing anchor structure has limited anchoring effect in soft soil layers, gravel soil layers, and sandy soil layers; and, affected by factors such as construction environment and the experience of construction workers, the anchoring effect of the existing anchors is unreliable, which is not conducive to the control of foundation pit deformation. Therefore, it is urgent for those skilled in the art to provide a more novel form of anchor reinforcement to meet the different construction needs of the building construction industry. Summary of the Utility Model

[0005] The utility model provides a self-drilling hollow anchor support device, which can meet the anchoring requirements of different rock and soil masses such as gravel soil, cohesive sandy soil layers, and silt layers, has a fast construction speed, low project cost, is clean, environmentally friendly and pollution-free at the construction site, and has good market application prospects.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A self-drilling hollow anchor support device includes: a self-drilling anchor head, an anchor head connecting sleeve, a first hollow drill rod, and a steel strand;

[0008] Among them, the self-drilling anchor head is composed of an anchor head and an anchor rod body; the anchor head is provided with self-tapping corrugations for drilling, and the anchor rod body is fixedly installed in the anchor head and extends outward with an extension part;

[0009] The first end of the anchor head connecting sleeve is fixedly connected to the extension of the anchor rod body to form an integral structure. The inner connecting thread is provided at the second end of the anchor head connecting sleeve. A filling cavity is further arranged inside the anchor head connecting sleeve, and a self-curing resin cartridge is hermetically filled in the filling cavity of the anchor head connecting sleeve.

[0010] The first end of the first hollow drill rod is provided with a first external thread. By the mutual cooperation of the first external thread and the inner connecting thread at the second end of the anchor head connecting sleeve, the connection relationship between the first hollow drill rod and the anchor head connecting sleeve is established / severed.

[0011] The steel strand is composed of a plurality of prestressed steel wires stranded together. Among them, a barb is further installed at the first end of the steel strand.

[0012] More preferably, it further includes: a second hollow extension rod and a drill rod connecting sleeve.

[0013] Among them, through the drill rod connecting sleeve, the first end of the second hollow extension rod is connected to the second end of the first hollow drill rod to form an integral structure.

[0014] More preferably, a plurality of grouting channels are further arranged on the side wall of the first end of the first hollow drill rod.

[0015] More preferably, a steel strand guiding member is arranged inside the drill rod connecting sleeve. The steel strand guiding member is used to guide the position of the steel strand in the first hollow drill rod, the drill rod connecting sleeve, and the second hollow extension rod. Among them, a through hole for passing the steel strand and a plurality of guiding pieces are processed on the steel strand guiding member, and a grouting gap is arranged between adjacent guiding pieces.

[0016] A horn-shaped slurry stopper is further installed outside the drill rod connecting sleeve. Among them, the opening direction of the slurry stopper is towards the first end direction of the first hollow drill rod.

[0017] More preferably, an anti-slip and anti-retreat groove for the steel strand is further processed on the inner wall of the anchor head connecting sleeve.

[0018] More preferably, a centering device is installed outside the second hollow extension rod.

[0019] And, a protective backing plate is installed at the second end of the second hollow extension rod. Among them, a grouting exhaust hole is arranged on the protective backing plate.

[0020] More preferably, mutually matching positioning holes are respectively arranged on the extension of the anchor rod body and the first end of the anchor head connecting sleeve.

[0021] Through the locking pin passing through the positioning hole, the first end of the anchor head connecting sleeve is fixedly connected to the extension of the anchor rod body to form an integral structure.

[0022] The utility model provides a self-drilling hollow anchor support device, which includes: a self-drilling anchor head, an anchor head connecting sleeve, a first hollow drill rod, a steel strand, a second hollow extension rod, a drill rod connecting sleeve and other structural units. The self-drilling hollow anchor support device with the above structural features integrates functions such as drilling, grouting and anchoring. The installation and construction process is simple, safe and reliable. The self-drilling anchor head has excellent penetrability and can effectively complete drilling construction under various geotechnical conditions; the formed anchor support structure has good crack filling effect and anti-slip and shear performance, can effectively improve the mechanical properties of the rock and soil where the foundation pit is located, achieve an ideal support effect, and provide strong technical support for the foundation pit support construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the utility model, and do not constitute a limitation to the utility model. In the following drawings:

[0024] Figure 1 is a structural schematic diagram of the self-drilling hollow anchor support device provided by the utility model;

[0025] Figure 2 is a structural schematic diagram of the self-drilling anchor head in the self-drilling hollow anchor support device;

[0026] Figure 3 is a structural schematic diagram of the anchor head connecting sleeve in the self-drilling hollow anchor support device;

[0027] Figure 4 is a connection structural schematic diagram of the first hollow drill rod, the drill rod connecting sleeve and the second hollow extension rod in the self-drilling hollow anchor support device;

[0028] Figure 5 is a structural schematic diagram of the steel strand in the self-drilling hollow anchor support device;

[0029] Figure 6 is a structural schematic diagram of the steel strand guide in the self-drilling hollow anchor support device.

[0030] Reference numerals:

[0031] 1. Self-drilling anchor head; 101. Anchor head; 102. Anchor rod body; 103. Positioning hole provided on the anchor rod body; 2. Anchor head connecting sleeve; 201. Filling cavity provided inside the anchor head connecting sleeve; 202. Positioning hole provided on the anchor head connecting sleeve; 3. First hollow drill pipe; 301. First external thread of the first hollow drill pipe; 4. Drill pipe connecting sleeve; 5. Second hollow extension rod; 6. Centering device; 7. Steel strand; 701. Spiked head provided at the head end of the steel strand; 8. Steel strand guide; 801. Through hole; 802. Guide piece; 803. Gap for grouting. Detailed implementation mode

[0032] The utility model provides a self-drilling hollow anchor bolt support device, which can meet the anchoring requirements of different rock and soil bodies such as gravel soil, cohesive sandy soil layer, and silt layer, has a fast construction speed, low project cost, a clean, environmentally friendly and pollution-free construction site, and has good market application prospects.

[0033] As Figure 1 shown, the utility model provides a self-drilling hollow anchor bolt support device, including: a self-drilling anchor head, an anchor head connecting sleeve, a first hollow drill pipe, a steel strand, and preferably a second hollow extension rod and a drill pipe connecting sleeve.

[0034] Specifically, the self-drilling anchor head selects a disposable drill bit, and its structure can be referred to as shown in Figure 2 shown, which is specifically composed of two parts: an anchor head and an anchor rod body. Among them, the anchor head is provided with self-tapping corrugations for drilling (the self-tapping corrugations can be used to extrude the rock and soil body outward when the self-drilling anchor head drills. This not only solves the situation that drilling and slag discharging are required during the construction of existing anchor bolts, but also avoids construction defects such as hole collapse and drill sticking); the anchor rod body is fixedly installed inside the anchor head and extends outward with an extension part.

[0035] As Figure 3 shown, Figure 3 is a reference structural schematic diagram of the anchor head connecting sleeve. Specifically, the head end of the anchor head connecting sleeve is fixedly connected to the extension part of the anchor rod body to form an integral structure. Among them, as a relatively preferred implementation mode of the utility model, the following method can be further selected: here, positioning holes that cooperate with each other are respectively arranged on the extension part of the anchor rod body and the head end of the anchor head connecting sleeve. By passing a locking pin through the above positioning holes, the head end of the anchor head connecting sleeve and the extension part of the anchor rod body are fixedly connected to form an integral structure.

[0036] In addition, an internal connection thread is provided at the end of the anchor head connection sleeve. Moreover, a medicine filling cavity is also provided inside the anchor head connection sleeve, and a self-curing resin cartridge is hermetically filled in the medicine filling cavity of the anchor head connection sleeve. It should be noted that the self-curing resin cartridge is used to provide an initial stress for the steel strand during installation, preventing the steel strand from slipping and displacement deviation due to improper installation position, grouting impact, etc.; and it also provides guarantee for the overall balance of the self-drilling hollow anchor support device during the support process.

[0037] It should be additionally noted that the self-curing resin cartridge specifically uses synthetic resin as the gelling material (replacing the existing cement gelling material). During use, after the technician drills the self-drilling anchor head in place, the steel strand is threaded through the first hollow drill rod, the drill rod connection sleeve, and the second hollow extension rod. By applying force for pressing and stirring, that is, using the steel strand to pierce the packaging of the self-curing resin cartridge and making it quickly harden and solidify within a few minutes, it plays the role of providing an initial stress for the installation of the steel strand.

[0038] As Figure 4 shown, Figure 4 FIG. is a connection reference schematic diagram of the first hollow drill rod, the second hollow extension rod, and the drill rod connection sleeve. It should be noted that the first hollow drill rod is made of hollow hexagonal steel (its material can be preferably 55SiMnMoV), and it is specifically used to conduct the torque (provided by the drill rig) to the self-drilling anchor head. Among them, a first external thread is provided at the head end of the first hollow drill rod. Through the mutual cooperation of the first external thread and the internal connection thread at the end of the anchor head connection sleeve, it is used to establish / disconnect the connection relationship between the first hollow drill rod and the anchor head connection sleeve (and the self-drilling anchor head is further fixedly connected to the anchor head connection sleeve).

[0039] More preferably, the head end of the second hollow extension rod is connected to the end of the first hollow drill rod through the drill rod connection sleeve to form an integral structure. Among them, as an extension of the first hollow drill rod, the second hollow extension rod can choose the same material as the first hollow drill rod (for example, it is also made of hollow hexagonal steel).

[0040] As Figure 5 shown, Figure 5 FIG. is a reference schematic diagram of the steel strand. The steel strand is specifically composed of multiple prestressed steel wires stranded together. Among them, a barb is also installed at the head end of the steel strand. The barb is used to extend into the anchor head connection sleeve when piercing the packaging of the self-curing resin cartridge.

[0041] In addition, as a more preferred embodiment, the following structural supplements are further provided for a self-drilling hollow anchor support device provided by the present invention.

[0042] On the one hand, preferably, a plurality of grouting channels are further provided on the side wall of the head end of the first hollow drill pipe; and a horn-shaped grout stopper is installed around the drill pipe connecting sleeve. Among them, the opening direction of the grout stopper is the head end direction of the first hollow drill pipe, and the grout stopper is used to block grouting and prevent grout overflow, so as to ensure the filling of the grouting liquid and facilitate the formation of a sufficiently firm grouting body in the channel.

[0043] In addition, a steel strand guide is arranged in the drill pipe connecting sleeve. Specifically, as Figure 6 shown, through holes for passing steel strands and a plurality of guiding pieces are processed on the steel strand guide, and grouting slits are arranged between adjacent guiding pieces. By using this steel strand guide (the steel strand passes through the through hole in the steel strand guide), the position of the steel strand in the first hollow drill pipe, the drill pipe connecting sleeve, and the second hollow extension rod can be guided.

[0044] On the other hand, preferably, a steel strand anti-slip and anti-retreat groove is further processed on the inner wall of the anchor head connecting sleeve, and the anti-slip and anti-retreat groove can be used to further assist the steel strand to prevent it from slipping and deviating in the grouting construction process. A centering device is installed around the second hollow extension rod (specifically used to align the position of the second hollow extension rod in the drilling hole); in addition, a protective backing plate is installed at the end of the second hollow extension rod. Among them, the protective backing plate is used to protect the drilling hole opening during grouting, and grouting exhaust holes can be selectively arranged on it.

[0045] To further help those skilled in the art understand the present invention, the construction implementation process of the self-drilling hollow anchor support device provided by the present invention is described as follows in combination with the accompanying drawings:

[0046] First, install the structure of the self-drilling hollow anchor support device. Specifically, in the first step: first fixedly connect the self-drilling anchor head and the anchor head connecting sleeve. During installation, it is necessary to ensure that the connection between the self-drilling anchor head and the anchor head connecting sleeve is firm and seamless; at the same time, check whether the packaging of the self-curing resin cartridge in the anchor head connecting sleeve is sealed to avoid affecting the hardening of the steel strand subsequently. In the second step: further establish a connection between the first hollow drill pipe and the anchor head connecting sleeve (and the self-drilling anchor head) through threaded cooperation. In the third step: select a second hollow extension rod with a suitable length according to the preset depth of the anchor support. And through the drill pipe connecting sleeve, connect the head end of the second hollow extension rod and the tail end of the first hollow drill pipe to form an integral structure.

[0047] After that, after the integrated structure is serially installed, the drilling construction begins. Specifically, the fourth step: Install the integrated structure formed by serially connecting the self-drilling anchor head, the anchor head connecting sleeve, the first hollow drill pipe, the drill pipe connecting sleeve, and the second hollow extension rod that has been installed on the drilling machine. Mark the drilling hole, determine the hole forming position, set the hole forming angle and depth, and start the drilling machine to drill forward. Drive the integrated serial structure of the self-drilling anchor head, the anchor head connecting sleeve, the first hollow drill pipe, the drill pipe connecting sleeve, and the second hollow extension rod with the drilling machine until the specified depth is reached and the drilling construction is completed.

[0048] The fifth step: After the drilling is completed, insert the steel strand into the first hollow drill pipe, the drill pipe connecting sleeve, and the second hollow extension rod. When the steel strand is inserted in place, use the steel strand barb to pierce the packaging of the self-curing resin cartridge, and complete the pressing and stirring of the self-curing resin cartridge. After the self-curing resin cartridge is self-cured, the steel strand can be pre-embedded (at this time, under the action of the condensation and hardening of the self-curing resin, the steel strand is connected to the self-drilling anchor head and the anchor head connecting sleeve as a whole). It should be noted that according to the different materials of the self-curing resin used, the self-curing time can usually be set to 5 minutes - 40 minutes.

[0049] After the steel strand is installed, the grouting construction of the drilling hole begins. Specifically, the sixth step: Inject the grouting liquid into the drilling hole through the channels in the first hollow drill pipe (and the grouting channels provided thereon), the drill pipe connecting sleeve, and the second hollow extension rod. While grouting, start the drilling machine to retreat in the reverse direction. At this time, disconnect the threaded connection between the first hollow drill pipe and the anchor head connecting sleeve (and the self-drilling anchor head), and slowly withdraw the first hollow drill pipe, the drill pipe connecting sleeve, and the second hollow extension rod.

[0050] During this process, attention should be paid to the coordination between the grouting speed and the withdrawal speed of the first hollow drill pipe, the drill pipe connecting sleeve, and the second hollow extension rod to ensure that the grouting liquid fully fills the entire hole. When the grouting liquid overflows to about 20 - 40 MM at the orifice of the hole, stop grouting; and completely withdraw the first hollow drill pipe, the drill pipe connecting sleeve, and the second hollow extension rod. Then, make protective treatment on the grouting port until the grouting is completely solidified. According to the type of cement mortar used for grouting (ordinary cement mortar, early-strength anchoring mortar, etc.), it is usually possible to choose to let it stand for 14 - 28 hours after grouting; at this time, subsequent prestressing construction and other operation treatments can be carried out.

[0051] The seventh step: Disassemble, clean, inspect, and recycle the withdrawn first hollow drill pipe, drill pipe connecting sleeve, second hollow extension rod, and the various fittings provided thereon. After passing the quality inspection, it can be reinstalled and recycled during the next bolt support construction.

[0052] The utility model provides a self-drilling hollow anchor support device, which includes: a self-drilling anchoring head, an anchoring head connecting sleeve, a first hollow drill rod, a steel strand, a second hollow extension rod, a drill rod connecting sleeve and other structural units. The self-drilling hollow anchor support device with the above structural features integrates functions such as drilling, grouting and anchoring, and is simple, safe and reliable in the installation and construction process. The self-drilling anchoring head has excellent penetrability and can effectively complete the drilling construction under various rock, soil and stone conditions; the formed anchor support structure has good crack filling effect and anti-slip and shear performance, can effectively improve the mechanical properties of the rock and soil body where the foundation pit is located, achieve an ideal support effect, and provide strong technical support for the foundation pit support construction.

[0053] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claimed rights.

Claims

1. A self-drilling hollow anchor support device, characterized in that, It includes: a self-drilling anchor head, an anchor head connecting sleeve, a first hollow drill rod, and a steel strand; Among them, the self-drilling anchor head is composed of an anchor head and an anchor rod body; self-tapping corrugations for drilling are provided on the anchor head, and the anchor rod body is fixedly installed in the anchor head and extends outward with an extension part; The first end of the anchor head connecting sleeve is fixedly connected to the extension part of the anchor rod body to form an integral structure, and an internal connecting thread is provided at the second end of the anchor head connecting sleeve; a filling cavity for medicine is also provided inside the anchor head connecting sleeve, and a self-curing resin cartridge is hermetically filled in the filling cavity for medicine of the anchor head connecting sleeve; A first external thread is provided at the first end of the first hollow drill rod; through the mutual cooperation of the first external thread and the internal connecting thread at the second end of the anchor head connecting sleeve, the connection relationship between the first hollow drill rod and the anchor head connecting sleeve is established / disconnected; The steel strand is composed of multiple prestressed steel wires stranded together; among them, a barb is also installed at the first end of the steel strand.

2. The self-drilling hollow anchor support device according to claim 1, characterized in that, It also includes: a second hollow extension rod and a drill rod connecting sleeve; Among them, through the drill rod connecting sleeve, the first end of the second hollow extension rod is connected to the second end of the first hollow drill rod to form an integral structure.

3. A self-drilling hollow anchor support device according to claim 1, characterized in that A plurality of grouting holes are also provided on the side wall at the first end of the first hollow drill rod.

4. The self-drilling hollow anchor support device according to claim 2, wherein, A steel strand guide is provided inside the drill rod connecting sleeve, and the steel strand guide is used to correct the position of the steel strand in the first hollow drill rod, the drill rod connecting sleeve, and the second hollow extension rod; among them, a through hole for passing the steel strand and a plurality of guiding pieces are machined on the steel strand guide, and a grouting gap is also provided between adjacent guiding pieces; A horn-shaped slurry stopper is also installed on the periphery of the drill rod connecting sleeve; among them, the opening direction of the slurry stopper is towards the first end direction of the first hollow drill rod.

5. A self-drilling hollow anchor support device according to claim 1, characterized in that, A steel strand anti-disengagement and anti-retreat groove is also machined on the inner wall of the anchor head connecting sleeve.

6. The self-drilling hollow anchor support device according to claim 2, characterized in that, An aligner is installed on the periphery of the second hollow extension rod; And, a protective backing plate is installed at the second end of the second hollow extension rod; among them, grouting exhaust holes are provided on the protective backing plate.

7. The self-drilling hollow anchor support device according to claim 1, characterized in that, Positioning holes that cooperate with each other are also respectively provided on the extension part of the anchor rod body and the first end of the anchor head connecting sleeve; Through the locking pin passing through the positioning holes, the first end of the anchor head connecting sleeve is fixedly connected to the extension part of the anchor rod body to form an integral structure.

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