A concrete precast for roadway support and a supporting method thereof

Abstract

The application discloses a kind of concrete prefabricated parts for roadway support and its supporting method, including prefabricated pipe section and prefabricated anchor rod, prefabricated anchor rod is installed on prefabricated pipe section, prefabricated pipe section includes multiple groups of main pipe piece and multiple groups of auxiliary pipe piece, main pipe piece middle two sides symmetrically are provided with slide rail, auxiliary pipe piece both sides are fixedly provided with arc-shaped lug, auxiliary pipe piece is slidably connected with the slide rail of main pipe piece by arc-shaped lug, and the both ends of auxiliary pipe piece are symmetrically provided with semicircular socket, main pipe piece middle is provided with anchor rod socket and connecting channel, and connecting channel is communicated with anchor rod socket, connecting channel one side is provided with connecting piece one, other side is provided with connecting piece two, and prefabricated anchor rod is installed in connecting channel, and prefabricated anchor rod is clamped by connecting piece one and connecting piece two;The above structure makes main pipe piece realize horizontal connection and circumferential direction connection, prevent the safety problem of tunnel caused by the axis of prefabricated pipe section not being aligned.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield and pipe jacking tunnel engineering, in particular to a concrete prefabricated part for roadway support and a support method thereof. BACKGROUND

[0002] The shield and pipe jacking tunnel method is the most widely used and most important engineering technology in the current underground tunnel construction, which has the advantages of safety, speed, quality control and good construction environment. However, in the liquefied sand layer or soft soil layer, after the construction of the shield and pipe jacking tunnel is completed, there is a problem of seismic liquefaction, the settlement during operation is large, the time required to reach stability is also long, and the settlement presents obvious non-uniformity, which leads to the problem of operation safety of the tunnel, and even endangers the structural safety. At present, many tunnels in the soft ground in China have appeared such problems.

[0003] In the shield and pipe jacking tunnel engineering, the most conventional method to solve the problem of seismic liquefaction and control the long-term operation settlement in the soft soil layer is to reinforce the soft ground around the tunnel during construction. Therefore, the reinforcement design has always been a difficult point in the design and construction of the shield and pipe jacking tunnel, especially when the surrounding of the tunnel is soft soil or water-rich liquefied sand layer, how to reinforce it is a difficult point of risk and quality control. Moreover, due to the increasing use of large cross-sectional area pipe sections in underground tunnel construction, the size and weight of the pipe sections are large, which causes difficulties in transportation, hoisting and storage. Therefore, it is urgent to design a prefabricated pipe section suitable for roadway support construction, which is easy to install and transport, and can meet the requirements of not damaging the pipe section structure and ensuring the reinforcement effect and controlling the settlement during operation, so as to solve the problem of reinforcement of the soft ground around the shield and pipe jacking tunnel. SUMMARY

[0004] In order to overcome the above technical problems, the purpose of the present application is to provide a concrete prefabricated part for roadway support and a support method thereof.

[0005] The purpose of the present application can be achieved by the following technical solutions.

[0006] A concrete prefabricated part for roadway support, comprising a prefabricated pipe section and a prefabricated anchor rod, the prefabricated anchor rod is installed on the prefabricated pipe section, the prefabricated pipe section comprises a plurality of main pipe sections and a plurality of auxiliary pipe sections, the main pipe section is symmetrically provided with sliding rails on both sides of the middle part, the auxiliary pipe section is fixedly provided with arc-shaped protrusions on both sides, the auxiliary pipe section is slidably connected with the sliding rails of the main pipe section through the arc-shaped protrusions, and the both ends of the auxiliary pipe section are symmetrically provided with semicircular sockets, the middle part of the main pipe section is provided with an anchor rod socket and a connecting channel, the connecting channel is communicated with the anchor rod socket, a connecting piece one is arranged on one side of the connecting channel, a connecting piece two is arranged on the other side of the connecting channel, and the prefabricated anchor rod is installed in the connecting channel and clamped by the connecting piece one and the connecting piece two.

[0007] As a further scheme of the present application: the number of main pipe pieces and auxiliary pipe pieces is equal, and the main pipe pieces and the auxiliary pipe pieces are connected to form prefabricated pipe sections.

[0008] As a further scheme of the present application: one end of the connecting piece one is provided with a locking groove, the other end of the connecting piece one is provided with an inclined surface one, and the connecting groove is symmetrically provided at both ends of the side of the connecting piece one where the inclined surface one is arranged.

[0009] As a further scheme of the present application: the connecting piece two comprises a wedge-shaped block, one end of the wedge-shaped block is provided with an inclined surface two, the other end of the wedge-shaped block is connected with a spring connecting piece, and the other end of the spring connecting piece is connected with a positioning block.

[0010] As a further scheme of the present application: the elastic locking key is arranged at one end inside the connecting channel, and the elastic locking key is matched with the locking groove.

[0011] As a further scheme of the present application: the upper end of the prefabricated anchor rod is provided with a locking groove one on one side and a locking groove two on the other side, and the connecting key is slidingly arranged at both ends inside the locking groove one, and the connecting key is matched with the connecting groove.

[0012] As a further scheme of the present application: the diameter of the prefabricated anchor rod is matched with the diameter of the semicircular socket.

[0013] A supporting method of a concrete prefabricated part for roadway support, characterized in that the method comprises the following steps:

[0014] Step one: a shield machine is used to install the main pipe pieces and the auxiliary pipe pieces to form a circle of prefabricated pipe sections;

[0015] Step two: a driving device inside the shield machine is used to drive the auxiliary pipe pieces to rotate by thirty degrees along the slide rail to complete the connection in the circumferential direction of the circle of prefabricated pipe sections;

[0016] Step three: an anchor rod driving device inside the shield machine is used to sequentially drive a plurality of prefabricated anchor rods into corresponding anchor rod sockets, when the prefabricated anchor rods are driven to a specified depth, the locking groove two and the locking groove one are matched with the corresponding wedge-shaped block and the connecting piece one respectively to complete the connection between the prefabricated anchor rods and the prefabricated pipe sections;

[0017] Step four: one end of the installed prefabricated pipe sections is butt-jointed to another circle of prefabricated pipe sections, and the butt-joint is achieved through the protruding positioning block of the completed prefabricated pipe sections;

[0018] Step five: the driving device inside the shield machine is used to drive the auxiliary pipe pieces to rotate by thirty degrees along the slide rail to complete the connection in the circumferential direction of the circle of prefabricated pipe sections;

[0019] Step six: use the anchor rod inside the shield machine to hit the device in turn to hit the prefabricated anchor rod into the anchor rod socket, when the prefabricated anchor rod is hit to the specified depth, the locking groove two and the locking groove one are matched with the corresponding wedge and the connecting piece one respectively, the connection of the prefabricated anchor rod and the prefabricated pipe section is completed, the horizontal connection of two circles of prefabricated pipe sections is completed through the cooperation of the connecting piece one and the elastic locking key, and the gap at the connection of the prefabricated pipe section and the prefabricated anchor rod is filled with concrete to reinforce the tunnel;

[0020] Step seven: repeat steps four to six until the shield construction is completed.

[0021] The beneficial effects of the present application are:

[0022] 1. The cooperation of the main pipe piece, the auxiliary pipe piece, the connecting piece two, the connecting piece one and the prefabricated anchor rod of the present application enables the prefabricated pipe section to realize horizontal connection and circumferential direction connection, so that the installation of the prefabricated pipe section is pre-positioned, preventing safety problems of the tunnel caused by misalignment of the axis of the prefabricated pipe section, and the installation steps are simple, and the use of the main pipe piece and the auxiliary pipe piece facilitates the transportation of the prefabricated pipe section;

[0023] 2. The use of the prefabricated anchor rod of the present application can not only damage the structure stress of the prefabricated pipe section, but also can ensure the reinforcement effect and control the settlement during operation, so as to solve the reinforcement problem of the shield and pipe jacking tunnel to the surrounding soft stratum, and the cooperation of the prefabricated anchor rod and the connecting piece two and the connecting piece one enables the prefabricated anchor rod to be hit at the same time, and the horizontal connection of the main pipe piece and the main pipe piece and the fixation of the main pipe piece and the prefabricated anchor rod are completed, so that the fixation is automatically completed after the anchor rod is hit, and the operation steps are optimized. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in conjunction with the drawings.

[0025] Figure 1 It is a structure schematic view of the prefabricated pipe section and the prefabricated anchor rod after installation of the present application.

[0026] Figure 2 It is a connection structure schematic view of the main pipe piece and the auxiliary pipe piece of the present application.

[0027] Figure 3 It is an installation position schematic view of the main pipe piece and the auxiliary pipe piece of the present application.

[0028] Figure 4 It is a structure schematic view of the connecting piece two and the connecting piece one when the prefabricated pipe section is not installed.

[0029] Figure 5 It is a structure schematic view when two main pipe pieces are horizontally connected.

[0030] Figure 6 It is a structure detail schematic view inside the connecting channel of the present application.

[0031] Figure 7 Figure 2 is a schematic view of the installation position of the connecting piece two and the connecting piece one of the two main pipe pieces of the present application;

[0032] Figure 8 Figure 3 is a schematic view of the structure of the horizontal connection and the circumferential direction connection of the four main pipe pieces of the present application;

[0033] Figure 9 Figure 4 is a front view of the prefabricated anchor rod of the present application;

[0034] Figure 10 Figure 5 is a schematic view of the structure of the locking groove one of the prefabricated anchor rod of the present application;

[0035] Figure 11 Figure 6 is a schematic view of the structure of the locking groove two of the prefabricated anchor rod of the present application.

[0036] Figure 1 is a schematic view of the present application; Figure 2 is a schematic view of the installation position of the connecting piece two and the connecting piece one of the two main pipe pieces of the present application; Figure 3 is a schematic view of the structure of the horizontal connection and the circumferential direction connection of the four main pipe pieces of the present application; Figure 4 is a front view of the prefabricated anchor rod of the present application; Figure 5 is a schematic view of the structure of the locking groove one of the prefabricated anchor rod of the present application; Figure 6 is a schematic view of the structure of the locking groove two of the prefabricated anchor rod of the present application. In the figures: 1, prefabricated pipe section; 2, prefabricated anchor rod; 11, main pipe piece; 12, auxiliary pipe piece; 111, anchor rod socket; 112, sliding rail; 113, connecting channel; 114, connecting piece one; 115, connecting piece two; 116, elastic locking key; 1141, locking groove; 1142, inclined surface one; 1143, connecting groove; 1151, wedge-shaped block; 1152, spring connecting piece; 1153, positioning block; 11511, inclined surface two; 121, semicircular socket; 122, arc-shaped protrusion; 21, locking groove one; 22, locking groove two; 211, connecting key. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0038] As shown in Figures 1-11 , it is a concrete prefabricated part for roadway support, which comprises a prefabricated pipe section 1 and a prefabricated anchor rod 2; wherein the prefabricated pipe section 1 and the prefabricated anchor rod 2 are prefabricated parts processed by concrete in a processing plant; a plurality of prefabricated anchor rods 2 are installed on a group of prefabricated pipe sections 1 for roadway support.

[0039] Further as shown in Figure 1 , Figure 2 , and Figure 3As shown, the prefabricated pipe section 1 includes multiple sets of main pipe segments 11 and multiple sets of secondary pipe segments 12, with the number of main pipe segments 11 and secondary pipe segments 12 corresponding to each other; slide rails 112 are symmetrically arranged on both sides of the middle of the main pipe segment 11, and arc-shaped protrusions 122 are fixedly arranged on both sides of the secondary pipe segment 12. The secondary pipe segment 12 slides with the slide rails 112 of the main pipe segment 11 through the arc-shaped protrusions 122, and semi-circular insertion ports 121 are symmetrically arranged at both ends of the secondary pipe segment 12. The semi-circular insertion ports 121 of two adjacent secondary pipe segments 12 are combined to form a complete circle.

[0040] Further such as Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the main pipe 11 has a vertically downward-pointing anchor bolt insertion port 111 in its middle, and a horizontally extending connecting channel 113 in its middle in the transverse direction; the connecting channel 113 communicates with the anchor bolt insertion port 111, and the connecting channel 113 is divided into a right half and a left half by the anchor bolt insertion port 111 (as shown). Figure 3 (The direction of view is the reference direction); a connector 114 is slidably disposed within the right half of the aforementioned connecting channel 113; details are as follows: Figure 4 As shown, the connector 114 is provided with a locking groove 1141, a bevel 1142 and a connecting groove 1143; wherein the connector 114 has a locking groove 1141 at one end, a bevel 1142 at the other end, and connecting grooves 1143 are symmetrically provided at both ends of the side of the connector 114 with the bevel 1142.

[0041] Further as Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a connector 115 is slidably disposed within the left half of the connecting channel 113; details are as follows: Figure 4 As shown, connector 2 115 includes a wedge block 1151, a spring connector 1152, and a positioning block 1153; and the positioning block 1153, the spring connector 1152, and the wedge block 1151 are connected in series from left to right. The wedge block 1151 has a slope 2 11511 at one end near connector 114; furthermore, the spring connector 1152 is in the natural state of the spring when the prefabricated anchor rod 2 is not installed, at which time the lengths of connector 2 115 and connector 114 are equal.

[0042] Further, such as Figure 6 and Figure 7 As shown, the leftmost end of the connecting channel 113 (with) Figure 6An elastic locking key 116 is provided at the opening (with the front view as the reference direction). The elastic locking key 116 is slidably disposed in the connection channel 113 opened in the main tube plate 11. It can slide vertically in the connection channel 113, and the elastic locking key 116 can cooperate with the locking groove 1141 to restrict the lateral movement of the connector 114.

[0043] Further, such as Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown, a locking groove 21 is provided on one side of the upper end of the prefabricated anchor rod 2. Both ends of the locking groove 21 are slidably provided with connecting keys 211. Both connecting keys 211 are wedges with springs at the rear ends. The connecting keys 211 can cooperate with the connecting groove 1143 to further restrict the lateral movement of the connecting piece 114 after the prefabricated anchor rod 2 is installed.

[0044] The precast anchor rod 2 has a locking groove 22 on the other side of its upper end. Unlike the locking groove 21, the locking groove 22 does not have a connecting key 211 inside. The locking groove 22 and the locking groove 21 respectively cooperate with the wedge block 1151 and the connector 114 to restrict the vertical movement of the precast anchor rod 2. Furthermore, the diameter of the precast anchor rod 2 is adapted to the diameter of the semi-circular socket 121 to facilitate the installation of the precast anchor rod 2.

[0045] The present invention also provides a method for supporting tunnels with precast concrete components, the steps of which are as follows:

[0046] Step 1: Use the tunnel boring machine (TBM) to install the main tunnel segment 11 and the auxiliary tunnel segment 12 in the first ring, forming the first ring of precast tunnel sections 1. The TBM then advances to the left (within the left direction). Figure 1 (The direction of direct view is the reference direction);

[0047] Step 2: Use the small drive device inside the tunnel boring machine to drive the secondary segment 12 to rotate 30 degrees along the slide rail 112 to complete the connection of the first precast segment 1 in the circumferential direction.

[0048] Step 3: Using the anchor bolt driving device inside the tunnel boring machine, multiple precast anchor bolts 2 are driven into the corresponding anchor bolt sockets 111 in sequence. When the precast anchor bolts 2 are driven to the specified depth (the specified depth is set manually), locking groove 22 and locking groove 21 respectively cooperate with the corresponding wedge block 1151 and connector 114 to complete the connection between the precast anchor bolts 2 and the precast pipe section 1. The connecting key 211 is embedded in the connecting groove 1143 to restrict the lateral movement of connector 114. Continue driving the precast anchor bolts 2 until one ring of precast anchor bolts 2 is driven in.

[0049] Step four: the left end of the installed prefabricated pipe section 1 will have a positioning block 1153 protruding from the opening of the connecting channel 113, the newly installed prefabricated pipe section 1 is positioned according to the position of the positioning block 1153, the positioning block 1153 is inserted into the opening of the connecting channel 113 of the right end of the newly installed prefabricated pipe section 1, so that the newly installed prefabricated pipe section 1 is aligned with the installed prefabricated pipe section 1;

[0050] Step five: use the small driving device inside the shield machine to drive the sub-pipe piece 12 to rotate thirty degrees along the slide rail 112, and complete the connection in the circumferential direction of the second circle of prefabricated pipe sections 1;

[0051] Step six: use the anchor rod driving device inside the shield machine to drive the prefabricated anchor rod 2 into the anchor rod socket 111 in sequence, when the prefabricated anchor rod 2 is driven to the specified depth, the locking groove two 22 and the locking groove one 21 are respectively matched with the corresponding wedge-shaped block 1151 and the connecting piece one 114, the connection of the prefabricated anchor rod 2 and the prefabricated pipe section 1 is completed, and the connecting key 211 is correspondingly embedded into the connecting groove 1143, limiting the transverse movement of the connecting piece one 114, at this time, the connecting piece one 114 of the newly installed prefabricated pipe section 1 at the left end will compress the spring connecting piece 1152 of the prefabricated pipe section 1 at the right end and be inserted into the left end opening of the connecting channel 113 of the prefabricated pipe section 1 at the right end, at this time, the elastic locking key 116 in the left end opening of the connecting channel 113 of the prefabricated pipe section 1 at the right end can be matched with the locking groove 1141 of the connecting piece one 114 of the prefabricated pipe section 1 at the left end, limiting the transverse movement of the connecting piece one 114, thus completing the horizontal connection of two circles of prefabricated pipe sections 1, continue to drive the prefabricated anchor rod 2 until the driving of one circle of prefabricated anchor rods 2 is completed, and fill the gap between the prefabricated pipe section 1 and the prefabricated anchor rod 2 with concrete to reinforce the tunnel;

[0052] Step seven: repeat steps four to six until the shield construction is completed.

[0053] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the patent scope of the present application.

Claims

1. A method for supporting tunnels using precast concrete components, characterized in that, The precast concrete component includes a precast pipe section (1) and a precast anchor rod (2). The precast anchor rod (2) is installed on the precast pipe section (1). The precast pipe section (1) includes multiple sets of main pipe segments (11) and multiple sets of secondary pipe segments (12). The main pipe segment (11) has symmetrically arranged slide rails (112) on both sides of the middle part. The secondary pipe segments (12) have arc-shaped protrusions (122) fixed on both sides. The secondary pipe segments (12) slide with the slide rails (112) of the main pipe segment (11) through the arc-shaped protrusions (122). The two ends of the secondary pipe segments (12) are symmetrically arranged with semi-circular sockets (121). The main pipe segment (11) has an anchor rod socket (111) and a connecting channel (113) in the middle part. The connecting channel (113) is connected to the anchor rod socket (111). A connector (114) is provided on one side of the connecting channel (113). On the other side, a second connector (115) is provided, and a prefabricated anchor rod (2) is installed in the connecting channel (113). The prefabricated anchor rod (2) is snapped together by the first connector (114) and the second connector (115). An elastic locking key (116) is provided at one end of the connecting channel (113), and the elastic locking key (116) is adapted to the locking groove (1141). A locking groove (21) is provided on one side of the upper end of the prefabricated anchor rod (2), and a locking groove (22) is provided on the other side. The second connector (115) includes a wedge block (1151). One end of the wedge block (1151) is provided with a slope (11511), and the other end of the wedge block (1151) is connected to a spring connector (1152). The other end of the spring connector (1152) is connected to a positioning block (1153). The support method includes the following steps: Step 1: Use a tunnel boring machine to install the main tube segment (11) and the auxiliary tube segment (12) to form a ring of prefabricated tube sections (1). Step 2: Use the drive device inside the tunnel boring machine to drive the auxiliary segment (12) to rotate 30 degrees along the slide rail (112) to complete the circumferential connection of one precast pipe section (1); Step 3: Use the anchor rod driving device inside the shield machine to drive multiple prefabricated anchor rods (2) into the corresponding anchor rod sockets (111) in sequence. When the prefabricated anchor rods (2) are driven to the specified depth, locking groove 2 (22) and locking groove 1 (21) cooperate with the corresponding wedge block (1151) and connector 1 (114) respectively to complete the connection between the prefabricated anchor rods (2) and the prefabricated pipe section (1). Step 4: Connect one end of the completed precast pipe section (1) to position another ring of precast pipe section (1), wherein the connection and positioning are achieved by the protruding positioning block (1153) of the completed precast pipe section (1). Step 5: Use the drive device inside the tunnel boring machine to drive the auxiliary segment (12) to rotate 30 degrees along the slide rail (112) to complete the circumferential connection of one precast pipe section (1); Step 6: Use the anchor rod driving device inside the shield machine to drive the precast anchor rod (2) into the anchor rod socket (111) in sequence. When the precast anchor rod (2) is driven into the specified depth, the locking groove 2 (22) and the locking groove 1 (21) cooperate with the corresponding wedge block (1151) and the connector 1 (114) respectively to complete the connection between the precast anchor rod (2) and the precast pipe section (1). The horizontal connection of the two precast pipe sections (1) is completed by the cooperation of the connector 1 (114) and the elastic locking key (116). The gap at the connection between the precast pipe section (1) and the precast anchor rod (2) is filled with concrete to reinforce the tunnel. Step 7: Repeat steps 4 through 6 until the tunnel boring machine (TBM) construction is completed.

2. The support method for precast concrete components used in roadway support according to claim 1, characterized in that, The number of main pipe segments (11) and auxiliary pipe segments (12) are equal and they are connected to each other to form a prefabricated pipe section (1).

3. The support method for precast concrete components used in roadway support according to claim 2, characterized in that, One end of the connector (114) is provided with a locking groove (1141), and the other end of the connector (114) is provided with a slope (1142). Connecting grooves (1143) are symmetrically provided at both ends of the side of the connector (114) where the slope (1142) is provided.

4. The support method for precast concrete components used in roadway support according to claim 1, characterized in that, Both ends of the locking groove (21) are slidably provided with connecting keys (211), which are adapted to the connecting groove (1143).

5. The support method for precast concrete components used in roadway support according to claim 1, characterized in that, The diameter of the prefabricated anchor rod (2) is matched with the diameter of the semi-circular socket (121).

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